Message 1160 (Frequency Standard Table Output Data) - Navman 12 Designer's Manual

3.5.1.16 Message 1160 (frequency standard table
output data).
This message contains parameters and table
data used in the receiver's frequency standard
compensation model. It is intended that this
Message ID: 1160
Rate: variable
Message length: 270 words
Word No.
1-4
5
6-7
8 Sequence Number (Note 2)
9 Table frequency offset (Note 3)
10.0 Table frequency offset valid (Note 4)
10.1-10.15
11 Offset error estimate (Note 5)
12 Aging rate estimate (Note 6)
13 Last rate update week (Note 7)
Frequency standard table (Note 8): LSB,
14-269
270
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: Each value of frequency error in the table shares this common offset value.
Note 4: Flag to indicate that the offset has been established.
Note 5: Filtered estimate of accumulated error in the table offset value.
Note 6: Filtered estimate of the current aging rate.
Note 7: Whole week number of the last update of the aging rate.
Note 8: LSB = the approximate time of last table entry update. MSB = the frequency error at each table temperature, less the table
offset.
Table 3-20 Message 1160 (frequency standard table output data)
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)
Reserved
MSB
Data checksum
message will be used in conjunction with Message
1360 to retrieve and restore this information for
external storage. The contents of the 'frequency
standard table output data' message are described
in Table 3-20.
Type Units
UDI 10 ms ticks
4 294 967 295
I
I ppm
bit
I ppm
I ppm/yr
I weeks
weeks
I
ppm
Range Resolution
0 to
0 to 32 767
0 to ±51 0.15
1 = valid
0 to ±51 0.002
0 to ±5 0.0002
0 to 32 767 1
0 to 1023 4
0 to ±19.05 0.15
31