16MN002000A © 2004 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.Message ID: 1002Rate: Variable; defaults to 1 HzMessage Length: 51 wordsWord No. Name Type Units Range1-4 Message header5 Header checksum6-7 Set time (Note 1) UDI 10 ms ticks 0 to 4 294 967 2958 Sequence number (Note 2) I 0 to 32 7679 Satellite measurement sequence number(Note 3) I 0 to 32 76710 GPS week number UI weeks 0 to 32 76711-12 GPS seconds into week UDI s 0 to 604 79913-14 GPS nanoseconds from epoch UDI ns 0 to 999 999 999Channel summary data15.0+(3*n) Measurement used (Note 4) Bit 1 = used15.1+(3*n) Ephemeris available Bit 1 = available15.2+(3*n) Measurement valid Bit 1 = valid15.3+(3*n) DGPS corrections available Bit 1 = available16+(3*n) Satellite PRN UI 0 to 3217+(3*n) C/No UI dBHz 0 to 6051 Data checksumNote 1: Set time is an internal 10 millisecond (T10) count since power-on initialisation enabled the processor interrupts. It is not usedto derive GPS time, but only serves to provide a sequence of events knowledge. The set time or T10 count references the receiver’sinternal time at which the message was created for output. The T10 range is approximately 71 weeks.Note 2: The sequence number is a count that indicates whether the data in a particular binary message has been updated orchanged since the last message output.Note 3: The satellite measurement sequence number relates the position solution data to a particular set of satellite measurementsfound in binary Messages 1002 and 1007 (channel summary message and channel measurement message, respectively).Note 4: n = 0 to 11.Table 3-6 Message 1002 (channel summary)3.5.1.2 Message 1002 (channel summary)This message provides a summary form of thesatellite range measurements and signal trackinginformation on a per- channel basis. The contentsof the ‘channel summary’ message are describedin Table 3-6
