ais.ais_msg

1 #!/usr/bin/env python 2 3 __version__ = '$Revision: 4791 $'.split()[1] 4 __date__ = '$Date: 2007-03-31 $'.split()[1] 5 __author__ = 'xmlbinmsg' 6 7 __doc__=''' 8 9 Autogenerated python functions to serialize/deserialize binary messages. 10 11 Generated by: ./aisxmlbinmsg2py.py 12 13 Need to then wrap these functions with the outer AIS packet and then 14 convert the whole binary blob to a NMEA string. Those functions are 15 not currently provided in this file. 16 17 serialize: python to ais binary 18 deserialize: ais binary to python 19 20 The generated code uses translators.py, binary.py, and aisstring.py 21 which should be packaged with the resulting files. 22 23 24 @requires: U{epydoc<http://epydoc.sourceforge.net/>} > 3.0alpha3 25 @requires: U{BitVector<http://cheeseshop.python.org/pypi/BitVector>} 26 27 @author: '''+__author__+''' 28 @version: ''' + __version__ +''' 29 @var __date__: Date of last svn commit 30 @undocumented: __version__ __author__ __doc__ parser 31 @status: under development 32 @license: Generated code has no license 33 @todo: FIX: put in a description of the message here with fields and types. 34 ''' 35 36 import sys 37 from decimal import Decimal 38 from BitVector import BitVector 39 40 import binary, aisstring 41 42 # FIX: check to see if these will be needed 43 TrueBV = BitVector(bitstring="1") 44 "Why always rebuild the True bit? This should speed things up a bunch" 45 FalseBV = BitVector(bitstring="0") 46 "Why always rebuild the False bit? This should speed things up a bunch" 47 48 49 fieldList = ( 50 'MessageID', 51 'RepeatIndicator', 52 'UserID', 53 'Altitude', 54 'SOG', 55 'PositionAccuracy', 56 'Position_longitude', 57 'Position_latitude', 58 'COG', 59 'TimeStamp', 60 'Reserved', 61 'DTE', 62 'Spare', 63 'RAIM', 64 'state_syncstate', 65 'state_slottimeout', 66 'state_slotoffset', 67 ) 68 69 fieldListPostgres = ( 70 'MessageID', 71 'RepeatIndicator', 72 'UserID', 73 'Altitude', 74 'SOG', 75 'PositionAccuracy', 76 'Position', # PostGIS data type 77 'COG', 78 'TimeStamp', 79 'Reserved', 80 'DTE', 81 'Spare', 82 'RAIM', 83 'state_syncstate', 84 'state_slottimeout', 85 'state_slotoffset', 86 ) 87 88 toPgFields = { 89 'Position_longitude':'Position', 90 'Position_latitude':'Position', 91 } 92 ''' 93 Go to the Postgis field names from the straight field name 94 ''' 95 96 fromPgFields = { 97 'Position':('Position_longitude','Position_latitude',), 98 } 99 ''' 100 Go from the Postgis field names to the straight field name 101 ''' 102 103 pgTypes = { 104 'Position':'POINT', 105 } 106 ''' 107 Lookup table for each postgis field name to get its type. 108 ''' 109

110 -def encode(params, validate=False):

111 '''Create a SARposition binary message payload to pack into an AIS Msg SARposition. 112 113 Fields in params: 114 - MessageID(uint): AIS message number. Must be 9 (field automatically set to "9") 115 - RepeatIndicator(uint): Indicated how many times a message has been repeated 116 - UserID(uint): Unique ship identification number (MMSI) 117 - Altitude(uint): Altitude (GNSS) 118 - SOG(udecimal): Speed over ground 119 - PositionAccuracy(uint): Accuracy of positioning fixes 120 - Position_longitude(decimal): Location of the vessel East West location 121 - Position_latitude(decimal): Location of the vessel North South location 122 - COG(udecimal): Course over ground 123 - TimeStamp(uint): UTC second when the report was generated 124 - Reserved(uint): Reserved for regional applications. Should be set to zero. (field automatically set to "0") 125 - DTE(bool): Dtta terminal ready 126 - Spare(uint): Not used. Should be set to zero. (field automatically set to "0") 127 - RAIM(bool): Receiver autonomous integrity monitoring flag 128 - state_syncstate(uint): Communications State - SOTDMA Sycronization state 129 - state_slottimeout(uint): Communications State - SOTDMA Frames remaining until a new slot is selected 130 - state_slotoffset(uint): Communications State - SOTDMA In what slot will the next transmission occur. BROKEN 131 @param params: Dictionary of field names/values. Throws a ValueError exception if required is missing 132 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented. 133 @rtype: BitVector 134 @return: encoded binary message (for binary messages, this needs to be wrapped in a msg 8 135 @note: The returned bits may not be 6 bit aligned. It is up to you to pad out the bits. 136 ''' 137 138 bvList = [] 139 bvList.append(binary.setBitVectorSize(BitVector(intVal=9),6)) 140 if 'RepeatIndicator' in params: 141 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['RepeatIndicator']),2)) 142 else: 143 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),2)) 144 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['UserID']),30)) 145 if 'Altitude' in params: 146 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['Altitude']),12)) 147 else: 148 bvList.append(binary.setBitVectorSize(BitVector(intVal=4095),12)) 149 if 'SOG' in params: 150 bvList.append(binary.setBitVectorSize(BitVector(intVal=int((Decimal(params['SOG'])*Decimal('10')))),10)) 151 else: 152 bvList.append(binary.setBitVectorSize(BitVector(intVal=int(1023)),10)) 153 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['PositionAccuracy']),1)) 154 if 'Position_longitude' in params: 155 bvList.append(binary.bvFromSignedInt(int(Decimal(params['Position_longitude'])*Decimal('600000')),28)) 156 else: 157 bvList.append(binary.bvFromSignedInt(108600000,28)) 158 if 'Position_latitude' in params: 159 bvList.append(binary.bvFromSignedInt(int(Decimal(params['Position_latitude'])*Decimal('600000')),27)) 160 else: 161 bvList.append(binary.bvFromSignedInt(54600000,27)) 162 if 'COG' in params: 163 bvList.append(binary.setBitVectorSize(BitVector(intVal=int((Decimal(params['COG'])*Decimal('10')))),12)) 164 else: 165 bvList.append(binary.setBitVectorSize(BitVector(intVal=int(3600)),12)) 166 if 'TimeStamp' in params: 167 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['TimeStamp']),6)) 168 else: 169 bvList.append(binary.setBitVectorSize(BitVector(intVal=60),6)) 170 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),8)) 171 if params["DTE"]: bvList.append(TrueBV) 172 else: bvList.append(FalseBV) 173 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),5)) 174 if params["RAIM"]: bvList.append(TrueBV) 175 else: bvList.append(FalseBV) 176 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['state_syncstate']),2)) 177 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['state_slottimeout']),3)) 178 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['state_slotoffset']),14)) 179 180 return binary.joinBV(bvList)

181

182 -def decode(bv, validate=False):

183 '''Unpack a SARposition message 184 185 Fields in params: 186 - MessageID(uint): AIS message number. Must be 9 (field automatically set to "9") 187 - RepeatIndicator(uint): Indicated how many times a message has been repeated 188 - UserID(uint): Unique ship identification number (MMSI) 189 - Altitude(uint): Altitude (GNSS) 190 - SOG(udecimal): Speed over ground 191 - PositionAccuracy(uint): Accuracy of positioning fixes 192 - Position_longitude(decimal): Location of the vessel East West location 193 - Position_latitude(decimal): Location of the vessel North South location 194 - COG(udecimal): Course over ground 195 - TimeStamp(uint): UTC second when the report was generated 196 - Reserved(uint): Reserved for regional applications. Should be set to zero. (field automatically set to "0") 197 - DTE(bool): Dtta terminal ready 198 - Spare(uint): Not used. Should be set to zero. (field automatically set to "0") 199 - RAIM(bool): Receiver autonomous integrity monitoring flag 200 - state_syncstate(uint): Communications State - SOTDMA Sycronization state 201 - state_slottimeout(uint): Communications State - SOTDMA Frames remaining until a new slot is selected 202 - state_slotoffset(uint): Communications State - SOTDMA In what slot will the next transmission occur. BROKEN 203 @type bv: BitVector 204 @param bv: Bits defining a message 205 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented. 206 @rtype: dict 207 @return: params 208 ''' 209 210 #Would be nice to check the bit count here.. 211 #if validate: 212 # assert (len(bv)==FIX: SOME NUMBER) 213 r = {} 214 r['MessageID']=9 215 r['RepeatIndicator']=int(bv[6:8]) 216 r['UserID']=int(bv[8:38]) 217 r['Altitude']=int(bv[38:50]) 218 r['SOG']=Decimal(int(bv[50:60]))/Decimal('10') 219 r['PositionAccuracy']=int(bv[60:61]) 220 r['Position_longitude']=Decimal(binary.signedIntFromBV(bv[61:89]))/Decimal('600000') 221 r['Position_latitude']=Decimal(binary.signedIntFromBV(bv[89:116]))/Decimal('600000') 222 r['COG']=Decimal(int(bv[116:128]))/Decimal('10') 223 r['TimeStamp']=int(bv[128:134]) 224 r['Reserved']=0 225 r['DTE']=bool(int(bv[142:143])) 226 r['Spare']=0 227 r['RAIM']=bool(int(bv[148:149])) 228 r['state_syncstate']=int(bv[149:151]) 229 r['state_slottimeout']=int(bv[151:154]) 230 r['state_slotoffset']=int(bv[154:168]) 231 return r

232

233 -def decodeMessageID(bv, validate=False):

234 return 9

235

236 -def decodeRepeatIndicator(bv, validate=False):

237 return int(bv[6:8])

238

239 -def decodeUserID(bv, validate=False):

240 return int(bv[8:38])

241

242 -def decodeAltitude(bv, validate=False):

243 return int(bv[38:50])

244

245 -def decodeSOG(bv, validate=False):

246 return Decimal(int(bv[50:60]))/Decimal('10')

247

248 -def decodePositionAccuracy(bv, validate=False):

249 return int(bv[60:61])

250

251 -def decodePosition_longitude(bv, validate=False):

252 return Decimal(binary.signedIntFromBV(bv[61:89]))/Decimal('600000')

253

254 -def decodePosition_latitude(bv, validate=False):

255 return Decimal(binary.signedIntFromBV(bv[89:116]))/Decimal('600000')

256

257 -def decodeCOG(bv, validate=False):

258 return Decimal(int(bv[116:128]))/Decimal('10')

259

260 -def decodeTimeStamp(bv, validate=False):

261 return int(bv[128:134])

262

263 -def decodeReserved(bv, validate=False):

264 return 0

265

266 -def decodeDTE(bv, validate=False):

267 return bool(int(bv[142:143]))

268

269 -def decodeSpare(bv, validate=False):

270 return 0

271

272 -def decodeRAIM(bv, validate=False):

273 return bool(int(bv[148:149]))

274

275 -def decodestate_syncstate(bv, validate=False):

276 return int(bv[149:151])

277

278 -def decodestate_slottimeout(bv, validate=False):

279 return int(bv[151:154])

280

281 -def decodestate_slotoffset(bv, validate=False):

282 return int(bv[154:168])

283 284

285 -def printHtml(params, out=sys.stdout):

286 out.write("<h3>SARposition<h3>\n") 287 out.write("<table border=\"1\">\n") 288 out.write("<tr bgcolor=\"orange\">\n") 289 out.write("<th align=\"left\">Field Name</th>\n") 290 out.write("<th align=\"left\">Type</th>\n") 291 out.write("<th align=\"left\">Value</th>\n") 292 out.write("<th align=\"left\">Value in Lookup Table</th>\n") 293 out.write("<th align=\"left\">Units</th>\n") 294 out.write("\n") 295 out.write("<tr>\n") 296 out.write("<td>MessageID</td>\n") 297 out.write("<td>uint</td>\n") 298 if 'MessageID' in params: 299 out.write(" <td>"+str(params['MessageID'])+"</td>\n") 300 out.write(" <td>"+str(params['MessageID'])+"</td>\n") 301 out.write("</tr>\n") 302 out.write("\n") 303 out.write("<tr>\n") 304 out.write("<td>RepeatIndicator</td>\n") 305 out.write("<td>uint</td>\n") 306 if 'RepeatIndicator' in params: 307 out.write(" <td>"+str(params['RepeatIndicator'])+"</td>\n") 308 if str(params['RepeatIndicator']) in RepeatIndicatorDecodeLut: 309 out.write("<td>"+RepeatIndicatorDecodeLut[str(params['RepeatIndicator'])]+"</td>") 310 else: 311 out.write("<td><i>Missing LUT entry</i></td>") 312 out.write("</tr>\n") 313 out.write("\n") 314 out.write("<tr>\n") 315 out.write("<td>UserID</td>\n") 316 out.write("<td>uint</td>\n") 317 if 'UserID' in params: 318 out.write(" <td>"+str(params['UserID'])+"</td>\n") 319 out.write(" <td>"+str(params['UserID'])+"</td>\n") 320 out.write("</tr>\n") 321 out.write("\n") 322 out.write("<tr>\n") 323 out.write("<td>Altitude</td>\n") 324 out.write("<td>uint</td>\n") 325 if 'Altitude' in params: 326 out.write(" <td>"+str(params['Altitude'])+"</td>\n") 327 if str(params['Altitude']) in AltitudeDecodeLut: 328 out.write("<td>"+AltitudeDecodeLut[str(params['Altitude'])]+"</td>") 329 else: 330 out.write("<td><i>Missing LUT entry</i></td>") 331 out.write("<td>meters</td>\n") 332 out.write("</tr>\n") 333 out.write("\n") 334 out.write("<tr>\n") 335 out.write("<td>SOG</td>\n") 336 out.write("<td>udecimal</td>\n") 337 if 'SOG' in params: 338 out.write(" <td>"+str(params['SOG'])+"</td>\n") 339 if str(params['SOG']) in SOGDecodeLut: 340 out.write("<td>"+SOGDecodeLut[str(params['SOG'])]+"</td>") 341 else: 342 out.write("<td><i>Missing LUT entry</i></td>") 343 out.write("<td>knots</td>\n") 344 out.write("</tr>\n") 345 out.write("\n") 346 out.write("<tr>\n") 347 out.write("<td>PositionAccuracy</td>\n") 348 out.write("<td>uint</td>\n") 349 if 'PositionAccuracy' in params: 350 out.write(" <td>"+str(params['PositionAccuracy'])+"</td>\n") 351 if str(params['PositionAccuracy']) in PositionAccuracyDecodeLut: 352 out.write("<td>"+PositionAccuracyDecodeLut[str(params['PositionAccuracy'])]+"</td>") 353 else: 354 out.write("<td><i>Missing LUT entry</i></td>") 355 out.write("</tr>\n") 356 out.write("\n") 357 out.write("<tr>\n") 358 out.write("<td>Position_longitude</td>\n") 359 out.write("<td>decimal</td>\n") 360 if 'Position_longitude' in params: 361 out.write(" <td>"+str(params['Position_longitude'])+"</td>\n") 362 out.write(" <td>"+str(params['Position_longitude'])+"</td>\n") 363 out.write("<td>degrees</td>\n") 364 out.write("</tr>\n") 365 out.write("\n") 366 out.write("<tr>\n") 367 out.write("<td>Position_latitude</td>\n") 368 out.write("<td>decimal</td>\n") 369 if 'Position_latitude' in params: 370 out.write(" <td>"+str(params['Position_latitude'])+"</td>\n") 371 out.write(" <td>"+str(params['Position_latitude'])+"</td>\n") 372 out.write("<td>degrees</td>\n") 373 out.write("</tr>\n") 374 out.write("\n") 375 out.write("<tr>\n") 376 out.write("<td>COG</td>\n") 377 out.write("<td>udecimal</td>\n") 378 if 'COG' in params: 379 out.write(" <td>"+str(params['COG'])+"</td>\n") 380 out.write(" <td>"+str(params['COG'])+"</td>\n") 381 out.write("<td>degrees</td>\n") 382 out.write("</tr>\n") 383 out.write("\n") 384 out.write("<tr>\n") 385 out.write("<td>TimeStamp</td>\n") 386 out.write("<td>uint</td>\n") 387 if 'TimeStamp' in params: 388 out.write(" <td>"+str(params['TimeStamp'])+"</td>\n") 389 if str(params['TimeStamp']) in TimeStampDecodeLut: 390 out.write("<td>"+TimeStampDecodeLut[str(params['TimeStamp'])]+"</td>") 391 else: 392 out.write("<td><i>Missing LUT entry</i></td>") 393 out.write("<td>seconds</td>\n") 394 out.write("</tr>\n") 395 out.write("\n") 396 out.write("<tr>\n") 397 out.write("<td>Reserved</td>\n") 398 out.write("<td>uint</td>\n") 399 if 'Reserved' in params: 400 out.write(" <td>"+str(params['Reserved'])+"</td>\n") 401 out.write(" <td>"+str(params['Reserved'])+"</td>\n") 402 out.write("</tr>\n") 403 out.write("\n") 404 out.write("<tr>\n") 405 out.write("<td>DTE</td>\n") 406 out.write("<td>bool</td>\n") 407 if 'DTE' in params: 408 out.write(" <td>"+str(params['DTE'])+"</td>\n") 409 out.write(" <td>"+str(params['DTE'])+"</td>\n") 410 out.write("</tr>\n") 411 out.write("\n") 412 out.write("<tr>\n") 413 out.write("<td>Spare</td>\n") 414 out.write("<td>uint</td>\n") 415 if 'Spare' in params: 416 out.write(" <td>"+str(params['Spare'])+"</td>\n") 417 out.write(" <td>"+str(params['Spare'])+"</td>\n") 418 out.write("</tr>\n") 419 out.write("\n") 420 out.write("<tr>\n") 421 out.write("<td>RAIM</td>\n") 422 out.write("<td>bool</td>\n") 423 if 'RAIM' in params: 424 out.write(" <td>"+str(params['RAIM'])+"</td>\n") 425 if str(params['RAIM']) in RAIMDecodeLut: 426 out.write("<td>"+RAIMDecodeLut[str(params['RAIM'])]+"</td>") 427 else: 428 out.write("<td><i>Missing LUT entry</i></td>") 429 out.write("</tr>\n") 430 out.write("\n") 431 out.write("<tr>\n") 432 out.write("<td>state_syncstate</td>\n") 433 out.write("<td>uint</td>\n") 434 if 'state_syncstate' in params: 435 out.write(" <td>"+str(params['state_syncstate'])+"</td>\n") 436 if str(params['state_syncstate']) in state_syncstateDecodeLut: 437 out.write("<td>"+state_syncstateDecodeLut[str(params['state_syncstate'])]+"</td>") 438 else: 439 out.write("<td><i>Missing LUT entry</i></td>") 440 out.write("</tr>\n") 441 out.write("\n") 442 out.write("<tr>\n") 443 out.write("<td>state_slottimeout</td>\n") 444 out.write("<td>uint</td>\n") 445 if 'state_slottimeout' in params: 446 out.write(" <td>"+str(params['state_slottimeout'])+"</td>\n") 447 if str(params['state_slottimeout']) in state_slottimeoutDecodeLut: 448 out.write("<td>"+state_slottimeoutDecodeLut[str(params['state_slottimeout'])]+"</td>") 449 else: 450 out.write("<td><i>Missing LUT entry</i></td>") 451 out.write("<td>frames</td>\n") 452 out.write("</tr>\n") 453 out.write("\n") 454 out.write("<tr>\n") 455 out.write("<td>state_slotoffset</td>\n") 456 out.write("<td>uint</td>\n") 457 if 'state_slotoffset' in params: 458 out.write(" <td>"+str(params['state_slotoffset'])+"</td>\n") 459 out.write(" <td>"+str(params['state_slotoffset'])+"</td>\n") 460 out.write("</tr>\n") 461 out.write("</table>\n")

462 463

464 -def printKml(params, out=sys.stdout):

465 '''KML (Keyhole Markup Language) for Google Earth, but without the header/footer''' 466 out.write("\ <Placemark>\n") 467 out.write("\t <name>"+str(params['UserID'])+"</name>\n") 468 out.write("\t\t<description>\n") 469 import StringIO 470 buf = StringIO.StringIO() 471 printHtml(params,buf) 472 import cgi 473 out.write(cgi.escape(buf.getvalue())) 474 out.write("\t\t</description>\n") 475 out.write("\t\t<styleUrl>#m_ylw-pushpin_copy0</styleUrl>\n") 476 out.write("\t\t<Point>\n") 477 out.write("\t\t\t<coordinates>") 478 out.write(str(params['Position_longitude'])) 479 out.write(',') 480 out.write(str(params['Position_latitude'])) 481 out.write(",0</coordinates>\n") 482 out.write("\t\t</Point>\n") 483 out.write("\t</Placemark>\n")

484

485 -def printFields(params, out=sys.stdout, format='std', fieldList=None, dbType='postgres'):

486 '''Print a SARposition message to stdout. 487 488 Fields in params: 489 - MessageID(uint): AIS message number. Must be 9 (field automatically set to "9") 490 - RepeatIndicator(uint): Indicated how many times a message has been repeated 491 - UserID(uint): Unique ship identification number (MMSI) 492 - Altitude(uint): Altitude (GNSS) 493 - SOG(udecimal): Speed over ground 494 - PositionAccuracy(uint): Accuracy of positioning fixes 495 - Position_longitude(decimal): Location of the vessel East West location 496 - Position_latitude(decimal): Location of the vessel North South location 497 - COG(udecimal): Course over ground 498 - TimeStamp(uint): UTC second when the report was generated 499 - Reserved(uint): Reserved for regional applications. Should be set to zero. (field automatically set to "0") 500 - DTE(bool): Dtta terminal ready 501 - Spare(uint): Not used. Should be set to zero. (field automatically set to "0") 502 - RAIM(bool): Receiver autonomous integrity monitoring flag 503 - state_syncstate(uint): Communications State - SOTDMA Sycronization state 504 - state_slottimeout(uint): Communications State - SOTDMA Frames remaining until a new slot is selected 505 - state_slotoffset(uint): Communications State - SOTDMA In what slot will the next transmission occur. BROKEN 506 @param params: Dictionary of field names/values. 507 @param out: File like object to write to 508 @rtype: stdout 509 @return: text to out 510 ''' 511 512 if 'std'==format: 513 out.write("SARposition:\n") 514 if 'MessageID' in params: out.write(" MessageID: "+str(params['MessageID'])+"\n") 515 if 'RepeatIndicator' in params: out.write(" RepeatIndicator: "+str(params['RepeatIndicator'])+"\n") 516 if 'UserID' in params: out.write(" UserID: "+str(params['UserID'])+"\n") 517 if 'Altitude' in params: out.write(" Altitude: "+str(params['Altitude'])+"\n") 518 if 'SOG' in params: out.write(" SOG: "+str(params['SOG'])+"\n") 519 if 'PositionAccuracy' in params: out.write(" PositionAccuracy: "+str(params['PositionAccuracy'])+"\n") 520 if 'Position_longitude' in params: out.write(" Position_longitude: "+str(params['Position_longitude'])+"\n") 521 if 'Position_latitude' in params: out.write(" Position_latitude: "+str(params['Position_latitude'])+"\n") 522 if 'COG' in params: out.write(" COG: "+str(params['COG'])+"\n") 523 if 'TimeStamp' in params: out.write(" TimeStamp: "+str(params['TimeStamp'])+"\n") 524 if 'Reserved' in params: out.write(" Reserved: "+str(params['Reserved'])+"\n") 525 if 'DTE' in params: out.write(" DTE: "+str(params['DTE'])+"\n") 526 if 'Spare' in params: out.write(" Spare: "+str(params['Spare'])+"\n") 527 if 'RAIM' in params: out.write(" RAIM: "+str(params['RAIM'])+"\n") 528 if 'state_syncstate' in params: out.write(" state_syncstate: "+str(params['state_syncstate'])+"\n") 529 if 'state_slottimeout' in params: out.write(" state_slottimeout: "+str(params['state_slottimeout'])+"\n") 530 if 'state_slotoffset' in params: out.write(" state_slotoffset: "+str(params['state_slotoffset'])+"\n") 531 elif 'csv'==format: 532 if None == options.fieldList: 533 options.fieldList = fieldList 534 needComma = False; 535 for field in fieldList: 536 if needComma: out.write(',') 537 needComma = True 538 if field in params: 539 out.write(str(params[field])) 540 # else: leave it empty 541 out.write("\n") 542 elif 'html'==format: 543 printHtml(params,out) 544 elif 'sql'==format: 545 sqlInsertStr(params,out,dbType=dbType) 546 elif 'kml'==format: 547 printKml(params,out) 548 elif 'kml-full'==format: 549 out.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n") 550 out.write("<kml xmlns=\"http://earth.google.com/kml/2.1\">\n") 551 out.write("<Document>\n") 552 out.write(" <name>SARposition</name>\n") 553 printKml(params,out) 554 out.write("</Document>\n") 555 out.write("</kml>\n") 556 else: 557 print "ERROR: unknown format:",format 558 assert False 559 560 return # Nothing to return

561 562 RepeatIndicatorEncodeLut = { 563 'default':'0', 564 'do not repeat any more':'3', 565 } #RepeatIndicatorEncodeLut 566 567 RepeatIndicatorDecodeLut = { 568 '0':'default', 569 '3':'do not repeat any more', 570 } # RepeatIndicatorEncodeLut 571 572 AltitudeEncodeLut = { 573 '4095 or higher':'4095', 574 } #AltitudeEncodeLut 575 576 AltitudeDecodeLut = { 577 '4095':'4095 or higher', 578 } # AltitudeEncodeLut 579 580 SOGEncodeLut = { 581 '102.2 knots or higher':'102.2', 582 } #SOGEncodeLut 583 584 SOGDecodeLut = { 585 '102.2':'102.2 knots or higher', 586 } # SOGEncodeLut 587 588 PositionAccuracyEncodeLut = { 589 'low (greater than 10 m)':'0', 590 'high (less than 10 m)':'1', 591 } #PositionAccuracyEncodeLut 592 593 PositionAccuracyDecodeLut = { 594 '0':'low (greater than 10 m)', 595 '1':'high (less than 10 m)', 596 } # PositionAccuracyEncodeLut 597 598 TimeStampEncodeLut = { 599 'not available/default':'60', 600 'manual input':'61', 601 'dead reckoning':'62', 602 'inoperative':'63', 603 } #TimeStampEncodeLut 604 605 TimeStampDecodeLut = { 606 '60':'not available/default', 607 '61':'manual input', 608 '62':'dead reckoning', 609 '63':'inoperative', 610 } # TimeStampEncodeLut 611 612 RAIMEncodeLut = { 613 'not in use':'False', 614 'in use':'True', 615 } #RAIMEncodeLut 616 617 RAIMDecodeLut = { 618 'False':'not in use', 619 'True':'in use', 620 } # RAIMEncodeLut 621 622 state_syncstateEncodeLut = { 623 'UTC direct':'0', 624 'UTC indirect':'1', 625 'synchronized to a base station':'2', 626 'synchronized to another station':'3', 627 } #state_syncstateEncodeLut 628 629 state_syncstateDecodeLut = { 630 '0':'UTC direct', 631 '1':'UTC indirect', 632 '2':'synchronized to a base station', 633 '3':'synchronized to another station', 634 } # state_syncstateEncodeLut 635 636 state_slottimeoutEncodeLut = { 637 'Last frame in this slot':'0', 638 '1 frames left':'1', 639 '2 frames left':'2', 640 '3 frames left':'3', 641 '4 frames left':'4', 642 '5 frames left':'5', 643 '6 frames left':'6', 644 '7 frames left':'7', 645 } #state_slottimeoutEncodeLut 646 647 state_slottimeoutDecodeLut = { 648 '0':'Last frame in this slot', 649 '1':'1 frames left', 650 '2':'2 frames left', 651 '3':'3 frames left', 652 '4':'4 frames left', 653 '5':'5 frames left', 654 '6':'6 frames left', 655 '7':'7 frames left', 656 } # state_slottimeoutEncodeLut 657 658 ###################################################################### 659 # SQL SUPPORT 660 ###################################################################### 661

662 -def sqlCreateStr(outfile=sys.stdout, fields=None, extraFields=None 663 ,addCoastGuardFields=True 664 ,dbType='postgres' 665 ):

666 ''' 667 Return the SQL CREATE command for this message type 668 @param outfile: file like object to print to. 669 @param fields: which fields to put in the create. Defaults to all. 670 @param extraFields: A sequence of tuples containing (name,sql type) for additional fields 671 @param addCoastGuardFields: Add the extra fields that come after the NMEA check some from the USCG N-AIS format 672 @param dbType: Which flavor of database we are using so that the create is tailored ('sqlite' or 'postgres') 673 @type addCoastGuardFields: bool 674 @return: sql create string 675 @rtype: str 676 677 @see: sqlCreate 678 ''' 679 # FIX: should this sqlCreate be the same as in LaTeX (createFuncName) rather than hard coded? 680 outfile.write(str(sqlCreate(fields,extraFields,addCoastGuardFields,dbType=dbType)))

681

682 -def sqlCreate(fields=None, extraFields=None, addCoastGuardFields=True, dbType='postgres'):

683 ''' 684 Return the sqlhelp object to create the table. 685 686 @param fields: which fields to put in the create. Defaults to all. 687 @param extraFields: A sequence of tuples containing (name,sql type) for additional fields 688 @param addCoastGuardFields: Add the extra fields that come after the NMEA check some from the USCG N-AIS format 689 @type addCoastGuardFields: bool 690 @param dbType: Which flavor of database we are using so that the create is tailored ('sqlite' or 'postgres') 691 @return: An object that can be used to generate a return 692 @rtype: sqlhelp.create 693 ''' 694 if None == fields: fields = fieldList 695 import sqlhelp 696 c = sqlhelp.create('SARposition',dbType=dbType) 697 c.addPrimaryKey() 698 if 'MessageID' in fields: c.addInt ('MessageID') 699 if 'RepeatIndicator' in fields: c.addInt ('RepeatIndicator') 700 if 'UserID' in fields: c.addInt ('UserID') 701 if 'Altitude' in fields: c.addInt ('Altitude') 702 if 'SOG' in fields: c.addDecimal('SOG',4,1) 703 if 'PositionAccuracy' in fields: c.addInt ('PositionAccuracy') 704 if dbType != 'postgres': 705 if 'Position_longitude' in fields: c.addDecimal('Position_longitude',8,5) 706 if dbType != 'postgres': 707 if 'Position_latitude' in fields: c.addDecimal('Position_latitude',8,5) 708 if 'COG' in fields: c.addDecimal('COG',4,1) 709 if 'TimeStamp' in fields: c.addInt ('TimeStamp') 710 if 'Reserved' in fields: c.addInt ('Reserved') 711 if 'DTE' in fields: c.addBool('DTE') 712 if 'Spare' in fields: c.addInt ('Spare') 713 if 'RAIM' in fields: c.addBool('RAIM') 714 if 'state_syncstate' in fields: c.addInt ('state_syncstate') 715 if 'state_slottimeout' in fields: c.addInt ('state_slottimeout') 716 if 'state_slotoffset' in fields: c.addInt ('state_slotoffset') 717 718 if addCoastGuardFields: 719 # c.addInt('cg_rssi') # Relative signal strength indicator 720 # c.addInt('cg_d') # dBm receive strength 721 # c.addInt('cg_T') # Receive timestamp from the AIS equipment 722 # c.addInt('cg_S') # Slot received in 723 # c.addVarChar('cg_x',10) # Idonno 724 c.addVarChar('cg_r',15) # Receiver station ID - should usually be an MMSI, but sometimes is a string 725 c.addInt('cg_sec') # UTC seconds since the epoch 726 727 c.addTimestamp('cg_timestamp') # UTC decoded cg_sec - not actually in the data stream 728 729 if dbType == 'postgres': 730 c.addPostGIS('Position','POINT',2); 731 732 return c

733

734 -def sqlInsertStr(params, outfile=sys.stdout, extraParams=None, dbType='postgres'):

735 ''' 736 Return the SQL INSERT command for this message type 737 @param params: dictionary of values keyed by field name 738 @param outfile: file like object to print to. 739 @param extraParams: A sequence of tuples containing (name,sql type) for additional fields 740 @return: sql create string 741 @rtype: str 742 743 @see: sqlCreate 744 ''' 745 outfile.write(str(sqlInsert(params,extraParams,dbType=dbType)))

746 747

748 -def sqlInsert(params,extraParams=None,dbType='postgres'):

749 ''' 750 Give the SQL INSERT statement 751 @param params: dict keyed by field name of values 752 @param extraParams: any extra fields that you have created beyond the normal ais message fields 753 @rtype: sqlhelp.insert 754 @return: insert class instance 755 @todo: allow optional type checking of params? 756 @warning: this will take invalid keys happily and do what??? 757 ''' 758 import sqlhelp 759 i = sqlhelp.insert('SARposition',dbType=dbType) 760 761 if dbType=='postgres': 762 finished = [] 763 for key in params: 764 if key in finished: 765 continue 766 767 if key not in toPgFields and key not in fromPgFields: 768 if type(params[key])==Decimal: i.add(key,float(params[key])) 769 else: i.add(key,params[key]) 770 else: 771 if key in fromPgFields: 772 val = params[key] 773 # Had better be a WKT type like POINT(-88.1 30.321) 774 i.addPostGIS(key,val) 775 finished.append(key) 776 else: 777 # Need to construct the type. 778 pgName = toPgFields[key] 779 #valStr='GeomFromText(\''+pgTypes[pgName]+'(' 780 valStr=pgTypes[pgName]+'(' 781 vals = [] 782 for nonPgKey in fromPgFields[pgName]: 783 vals.append(str(params[nonPgKey])) 784 finished.append(nonPgKey) 785 valStr+=' '.join(vals)+')' 786 i.addPostGIS(pgName,valStr) 787 else: 788 for key in params: 789 if type(params[key])==Decimal: i.add(key,float(params[key])) 790 else: i.add(key,params[key]) 791 792 if None != extraParams: 793 for key in extraParams: 794 i.add(key,extraParams[key]) 795 796 return i

797 798 ###################################################################### 799 # LATEX SUPPORT 800 ###################################################################### 801

802 -def latexDefinitionTable(outfile=sys.stdout 803 ):

804 ''' 805 Return the LaTeX definition table for this message type 806 @param outfile: file like object to print to. 807 @type outfile: file obj 808 @return: LaTeX table string via the outfile 809 @rtype: str 810 811 ''' 812 o = outfile 813 814 o.write(''' 815 \\begin{table}%[htb] 816 \\centering 817 \\begin{tabular}{|l|c|l|} 818 \\hline 819 Parameter & Number of bits & Description 820 \\\\ \\hline\\hline 821 MessageID & 6 & AIS message number. Must be 9 \\\\ \hline 822 RepeatIndicator & 2 & Indicated how many times a message has been repeated \\\\ \hline 823 UserID & 30 & Unique ship identification number (MMSI) \\\\ \hline 824 Altitude & 12 & Altitude (GNSS) \\\\ \hline 825 SOG & 10 & Speed over ground \\\\ \hline 826 PositionAccuracy & 1 & Accuracy of positioning fixes \\\\ \hline 827 Position\_longitude & 28 & Location of the vessel East West location \\\\ \hline 828 Position\_latitude & 27 & Location of the vessel North South location \\\\ \hline 829 COG & 12 & Course over ground \\\\ \hline 830 TimeStamp & 6 & UTC second when the report was generated \\\\ \hline 831 Reserved & 8 & Reserved for regional applications. Should be set to zero. \\\\ \hline 832 DTE & 1 & Dtta terminal ready \\\\ \hline 833 Spare & 5 & Not used. Should be set to zero. \\\\ \hline 834 RAIM & 1 & Receiver autonomous integrity monitoring flag \\\\ \hline 835 state\_syncstate & 2 & Communications State - SOTDMA Sycronization state \\\\ \hline 836 state\_slottimeout & 3 & Communications State - SOTDMA Frames remaining until a new slot is selected \\\\ \hline 837 state\_slotoffset & 14 & Communications State - SOTDMA In what slot will the next transmission occur. BROKEN\\\\ \\hline \\hline 838 Total bits & 168 & Appears to take 1 slot \\\\ \\hline 839 \\end{tabular} 840 \\caption{AIS message number 9: Search and rescue position report} 841 \\label{tab:SARposition} 842 \\end{table} 843 ''')

844 845 846 ###################################################################### 847 # UNIT TESTING 848 ###################################################################### 849 import unittest

850 -def testParams():

851 '''Return a params file base on the testvalue tags. 852 @rtype: dict 853 @return: params based on testvalue tags 854 ''' 855 params = {} 856 params['MessageID'] = 9 857 params['RepeatIndicator'] = 1 858 params['UserID'] = 1193046 859 params['Altitude'] = 1001 860 params['SOG'] = Decimal('101.9') 861 params['PositionAccuracy'] = 1 862 params['Position_longitude'] = Decimal('-122.16328055555556') 863 params['Position_latitude'] = Decimal('37.424458333333334') 864 params['COG'] = Decimal('34.5') 865 params['TimeStamp'] = 35 866 params['Reserved'] = 0 867 params['DTE'] = False 868 params['Spare'] = 0 869 params['RAIM'] = False 870 params['state_syncstate'] = 2 871 params['state_slottimeout'] = 0 872 params['state_slotoffset'] = 1221 873 874 return params

875

876 -class TestSARposition(unittest.TestCase):

877 '''Use testvalue tag text from each type to build test case the SARposition message'''

878 - def testEncodeDecode(self):

879 880 params = testParams() 881 bits = encode(params) 882 r = decode(bits) 883 884 # Check that each parameter came through ok. 885 self.failUnlessEqual(r['MessageID'],params['MessageID']) 886 self.failUnlessEqual(r['RepeatIndicator'],params['RepeatIndicator']) 887 self.failUnlessEqual(r['UserID'],params['UserID']) 888 self.failUnlessEqual(r['Altitude'],params['Altitude']) 889 self.failUnlessAlmostEqual(r['SOG'],params['SOG'],1) 890 self.failUnlessEqual(r['PositionAccuracy'],params['PositionAccuracy']) 891 self.failUnlessAlmostEqual(r['Position_longitude'],params['Position_longitude'],5) 892 self.failUnlessAlmostEqual(r['Position_latitude'],params['Position_latitude'],5) 893 self.failUnlessAlmostEqual(r['COG'],params['COG'],1) 894 self.failUnlessEqual(r['TimeStamp'],params['TimeStamp']) 895 self.failUnlessEqual(r['Reserved'],params['Reserved']) 896 self.failUnlessEqual(r['DTE'],params['DTE']) 897 self.failUnlessEqual(r['Spare'],params['Spare']) 898 self.failUnlessEqual(r['RAIM'],params['RAIM']) 899 self.failUnlessEqual(r['state_syncstate'],params['state_syncstate']) 900 self.failUnlessEqual(r['state_slottimeout'],params['state_slottimeout']) 901 self.failUnlessEqual(r['state_slotoffset'],params['state_slotoffset'])

902

903 -def addMsgOptions(parser):

904 parser.add_option('-d','--decode',dest='doDecode',default=False,action='store_true', 905 help='decode a "SARposition" AIS message') 906 parser.add_option('-e','--encode',dest='doEncode',default=False,action='store_true', 907 help='encode a "SARposition" AIS message') 908 parser.add_option('--RepeatIndicator-field', dest='RepeatIndicatorField',default=0,metavar='uint',type='int' 909 ,help='Field parameter value [default: %default]') 910 parser.add_option('--UserID-field', dest='UserIDField',metavar='uint',type='int' 911 ,help='Field parameter value [default: %default]') 912 parser.add_option('--Altitude-field', dest='AltitudeField',default=4095,metavar='uint',type='int' 913 ,help='Field parameter value [default: %default]') 914 parser.add_option('--SOG-field', dest='SOGField',default=Decimal('102.3'),metavar='udecimal',type='string' 915 ,help='Field parameter value [default: %default]') 916 parser.add_option('--PositionAccuracy-field', dest='PositionAccuracyField',metavar='uint',type='int' 917 ,help='Field parameter value [default: %default]') 918 parser.add_option('--Position_longitude-field', dest='Position_longitudeField',default=Decimal('181'),metavar='decimal',type='string' 919 ,help='Field parameter value [default: %default]') 920 parser.add_option('--Position_latitude-field', dest='Position_latitudeField',default=Decimal('91'),metavar='decimal',type='string' 921 ,help='Field parameter value [default: %default]') 922 parser.add_option('--COG-field', dest='COGField',default=Decimal('360'),metavar='udecimal',type='string' 923 ,help='Field parameter value [default: %default]') 924 parser.add_option('--TimeStamp-field', dest='TimeStampField',default=60,metavar='uint',type='int' 925 ,help='Field parameter value [default: %default]') 926 parser.add_option('--DTE-field', dest='DTEField',metavar='bool',type='int' 927 ,help='Field parameter value [default: %default]') 928 parser.add_option('--RAIM-field', dest='RAIMField',metavar='bool',type='int' 929 ,help='Field parameter value [default: %default]') 930 parser.add_option('--state_syncstate-field', dest='state_syncstateField',metavar='uint',type='int' 931 ,help='Field parameter value [default: %default]') 932 parser.add_option('--state_slottimeout-field', dest='state_slottimeoutField',metavar='uint',type='int' 933 ,help='Field parameter value [default: %default]') 934 parser.add_option('--state_slotoffset-field', dest='state_slotoffsetField',metavar='uint',type='int' 935 ,help='Field parameter value [default: %default]')

936 937 ############################################################ 938 if __name__=='__main__': 939 940 from optparse import OptionParser 941 parser = OptionParser(usage="%prog [options]", 942 version="%prog "+__version__) 943 944 parser.add_option('--doc-test',dest='doctest',default=False,action='store_true', 945 help='run the documentation tests') 946 parser.add_option('--unit-test',dest='unittest',default=False,action='store_true', 947 help='run the unit tests') 948 parser.add_option('-v','--verbose',dest='verbose',default=False,action='store_true', 949 help='Make the test output verbose') 950 951 # FIX: remove nmea from binary messages. No way to build the whole packet? 952 # FIX: or build the surrounding msg 8 for a broadcast? 953 typeChoices = ('binary','nmeapayload','nmea') # FIX: what about a USCG type message? 954 parser.add_option('-t','--type',choices=typeChoices,type='choice',dest='ioType' 955 ,default='nmeapayload' 956 ,help='What kind of string to write for encoding ('+', '.join(typeChoices)+') [default: %default]') 957 958 959 outputChoices = ('std','html','csv','sql' , 'kml','kml-full') 960 parser.add_option('-T','--output-type',choices=outputChoices,type='choice',dest='outputType' 961 ,default='std' 962 ,help='What kind of string to output ('+', '.join(outputChoices)+') [default: %default]') 963 964 parser.add_option('-o','--output',dest='outputFileName',default=None, 965 help='Name of the python file to write [default: stdout]') 966 967 parser.add_option('-f','--fields',dest='fieldList',default=None, action='append', 968 choices=fieldList, 969 help='Which fields to include in the output. Currently only for csv output [default: all]') 970 971 parser.add_option('-p','--print-csv-field-list',dest='printCsvfieldList',default=False,action='store_true', 972 help='Print the field name for csv') 973 974 parser.add_option('-c','--sql-create',dest='sqlCreate',default=False,action='store_true', 975 help='Print out an sql create command for the table.') 976 977 parser.add_option('--latex-table',dest='latexDefinitionTable',default=False,action='store_true', 978 help='Print a LaTeX table of the type') 979 980 dbChoices = ('sqlite','postgres') 981 parser.add_option('-D','--db-type',dest='dbType',default='postgres' 982 ,choices=dbChoices,type='choice' 983 ,help='What kind of database ('+', '.join(dbChoices)+') [default: %default]') 984 985 addMsgOptions(parser) 986 987 (options,args) = parser.parse_args() 988 success=True 989 990 if options.doctest: 991 import os; print os.path.basename(sys.argv[0]), 'doctests ...', 992 sys.argv= [sys.argv[0]] 993 if options.verbose: sys.argv.append('-v') 994 import doctest 995 numfail,numtests=doctest.testmod() 996 if numfail==0: print 'ok' 997 else: 998 print 'FAILED' 999 success=False 1000 1001 if not success: sys.exit('Something Failed') 1002 del success # Hide success from epydoc 1003 1004 if options.unittest: 1005 sys.argv = [sys.argv[0]] 1006 if options.verbose: sys.argv.append('-v') 1007 unittest.main() 1008 1009 outfile = sys.stdout 1010 if None!=options.outputFileName: 1011 outfile = file(options.outputFileName,'w') 1012 1013 1014 if options.doEncode: 1015 # First make sure all non required options are specified 1016 if None==options.RepeatIndicatorField: parser.error("missing value for RepeatIndicatorField") 1017 if None==options.UserIDField: parser.error("missing value for UserIDField") 1018 if None==options.AltitudeField: parser.error("missing value for AltitudeField") 1019 if None==options.SOGField: parser.error("missing value for SOGField") 1020 if None==options.PositionAccuracyField: parser.error("missing value for PositionAccuracyField") 1021 if None==options.Position_longitudeField: parser.error("missing value for Position_longitudeField") 1022 if None==options.Position_latitudeField: parser.error("missing value for Position_latitudeField") 1023 if None==options.COGField: parser.error("missing value for COGField") 1024 if None==options.TimeStampField: parser.error("missing value for TimeStampField") 1025 if None==options.DTEField: parser.error("missing value for DTEField") 1026 if None==options.RAIMField: parser.error("missing value for RAIMField") 1027 if None==options.state_syncstateField: parser.error("missing value for state_syncstateField") 1028 if None==options.state_slottimeoutField: parser.error("missing value for state_slottimeoutField") 1029 if None==options.state_slotoffsetField: parser.error("missing value for state_slotoffsetField") 1030 msgDict={ 1031 'MessageID': '9', 1032 'RepeatIndicator': options.RepeatIndicatorField, 1033 'UserID': options.UserIDField, 1034 'Altitude': options.AltitudeField, 1035 'SOG': options.SOGField, 1036 'PositionAccuracy': options.PositionAccuracyField, 1037 'Position_longitude': options.Position_longitudeField, 1038 'Position_latitude': options.Position_latitudeField, 1039 'COG': options.COGField, 1040 'TimeStamp': options.TimeStampField, 1041 'Reserved': '0', 1042 'DTE': options.DTEField, 1043 'Spare': '0', 1044 'RAIM': options.RAIMField, 1045 'state_syncstate': options.state_syncstateField, 1046 'state_slottimeout': options.state_slottimeoutField, 1047 'state_slotoffset': options.state_slotoffsetField, 1048 } 1049 1050 bits = encode(msgDict) 1051 if 'binary'==options.ioType: print str(bits) 1052 elif 'nmeapayload'==options.ioType: 1053 # FIX: figure out if this might be necessary at compile time 1054 print "bitLen",len(bits) 1055 bitLen=len(bits) 1056 if bitLen%6!=0: 1057 bits = bits + BitVector(size=(6 - (bitLen%6))) # Pad out to multiple of 6 1058 print "result:",binary.bitvectoais6(bits)[0] 1059 1060 1061 # FIX: Do not emit this option for the binary message payloads. Does not make sense. 1062 elif 'nmea'==options.ioType: sys.exit("FIX: need to implement this capability") 1063 else: sys.exit('ERROR: unknown ioType. Help!') 1064 1065 1066 if options.sqlCreate: 1067 sqlCreateStr(outfile,options.fieldList,dbType=options.dbType) 1068 1069 if options.latexDefinitionTable: 1070 latexDefinitionTable(outfile) 1071 1072 if options.printCsvfieldList: 1073 # Make a csv separated list of fields that will be displayed for csv 1074 if None == options.fieldList: options.fieldList = fieldList 1075 import StringIO 1076 buf = StringIO.StringIO() 1077 for field in options.fieldList: 1078 buf.write(field+',') 1079 result = buf.getvalue() 1080 if result[-1] == ',': print result[:-1] 1081 else: print result 1082 1083 if options.doDecode: 1084 for msg in args: 1085 bv = None 1086 1087 if msg[0] in ('$','!') and msg[3:6] in ('VDM','VDO'): 1088 # Found nmea 1089 # FIX: do checksum 1090 bv = binary.ais6tobitvec(msg.split(',')[5]) 1091 else: # either binary or nmeapayload... expect mostly nmeapayloads 1092 # assumes that an all 0 and 1 string can not be a nmeapayload 1093 binaryMsg=True 1094 for c in msg: 1095 if c not in ('0','1'): 1096 binaryMsg=False 1097 break 1098 if binaryMsg: 1099 bv = BitVector(bitstring=msg) 1100 else: # nmeapayload 1101 bv = binary.ais6tobitvec(msg) 1102 1103 printFields(decode(bv) 1104 ,out=outfile 1105 ,format=options.outputType 1106 ,fieldList=options.fieldList 1107 ,dbType=options.dbType 1108 ) 1109

Source Code for Module ais.ais_msg_9