Message 1002 (Channel Summary) - Navman 12 Designer's Manual

3.5.1.2 Message 1002 (channel summary)

This message provides a summary form of the
satellite range measurements and signal tracking
Message ID: 1002
Rate: Variable; defaults to 1 Hz
Message Length: 51 words
Word No.
1-4
5
6-7
8 Sequence number (Note 2)
Satellite measurement sequence number
9
10
11-12 GPS seconds into week
13-14 GPS nanoseconds from epoch
15.0+(3*n) Measurement used (Note 4)
15.1+(3*n)
15.2+(3*n)
15.3+(3*n) DGPS corrections available
16+(3*n)
17+(3*n)
51
Note 1: Set time is an internal 10 millisecond (T10) count since power-on initialisation enabled the processor interrupts. It is not used
to derive GPS time, but only serves to provide a sequence of events knowledge. The set time or T10 count references the receiver's
internal 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 or
changed since the last message output.
Note 3: The satellite measurement sequence number relates the position solution data to a particular set of satellite measurements
found in binary Messages 1002 and 1007 (channel summary message and channel measurement message, respectively).
Note 4: n = 0 to 11.
MN002000A © 2004 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.
Name
Message header
Header checksum
Set time (Note 1)
(Note 3)
GPS week number
Channel summary data
Ephemeris available
Measurement valid
Satellite PRN
C/No
Data checksum
Table 3-6 Message 1002 (channel summary)
information on a per- channel basis. The contents
of the 'channel summary' message are described
in Table 3-6
Type Units
UDI 10 ms ticks
I
I
UI weeks
UDI s
UDI ns
Bit
Bit
Bit
Bit
UI
UI dBHz
Range
0 to 4 294 967 295
0 to 32 767
0 to 32 767
0 to 32 767
0 to 604 799
0 to 999 999 999
1 = used
1 = available
1 = valid
1 = available
0 to 32
0 to 60
16