AIS Analysis 'Results' and AIS Standards Activities

摘要

AIS Valid Position Reports are 18 bytes when transmitted from the ORBCOMM satellites to the ground infrastructure. They contain the information as noted in the ITU-R M.1371 documentation as follows: Message ID Repeat Indicator User ID (MMSI) Navigational Status Rate of Turn Speed Over Ground Position Accuracy Longitude Latitude Course Over Ground True Heading Time Stamp The final four fields as noted in the ITU-R M.1371 documentation are not used; they are: Special maneuver indicator (2 bits) Spare (3 bits) RAIM Flag (1 bit) Communication State (19 bits).