INSSTDEVS
Short INS PVA standard deviations
|
Platform: |
OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7-S |
This log is the short header version of the INSSTDEV log.
Message ID: 2052
Log Type: Synch
Abbreviated ASCII Syntax:
log insstdevs ontime 1
ASCII Example:
%INSSTDEVSA,2209,491032.000;0.1812,0.1812,0.1805,0.0018,0.0018,0.0017,0.0291,0.0291,0.0575,13000045,0,0,7fd1bf,0*b6d40807
|
Field |
Field Type |
Description |
Binary Format |
Binary Bytes |
Binary Offset |
|---|---|---|---|---|---|
|
1 |
Log header |
INSSTDEVS header For information about short log headers, see Description of ASCII and Binary Logs with Short Headers. |
- |
H |
0 |
|
2 |
Latitude σ |
Latitude standard deviation (m) |
Float |
4 |
H |
|
3 |
Longitude σ |
Longitude standard deviation (m) |
Float |
4 |
H+4 |
|
4 |
Height σ |
Height standard deviation (m) |
Float |
4 |
H+8 |
|
5 |
North Velocity σ |
North velocity standard deviation (m/s) |
Float |
4 |
H+12 |
|
6 |
East Velocity σ |
East velocity standard deviation (m/s) |
Float |
4 |
H+16 |
|
7 |
Up Velocity σ |
Up velocity standard deviation (m/s) |
Float |
4 |
H+20 |
|
8 |
Roll σ |
Roll standard deviation (degrees) |
Float |
4 |
H+24 |
|
9 |
Pitch σ |
Pitch standard deviation (degrees) |
Float |
4 |
H+28 |
|
10 |
Azimuth σ |
Azimuth standard deviation (degrees) |
Float |
4 |
H+32 |
|
11 |
Ext sol stat |
Extended solution status |
Ulong |
4 |
H+36 |
|
12 |
Time Since Update |
Elapsed time since the last ZUPT or position update (seconds) |
Ushort |
2 |
H+40 |
|
13 |
Reserved |
Ushort |
2 |
H+42 |
|
|
14 |
Reserved |
Ulong |
4 |
H+44 |
|
|
15 |
Reserved |
Ulong |
4 |
H+48 |
|
|
16 |
xxxx |
32-bit CRC (ASCII and Binary only). |
Hex |
4 |
H+52 |
|
17 |
[CR][LF] |
Sentence terminator (ASCII only). |
- |
- |
- |
The INS standard deviation values reported by the SPAN filter are an estimate of the Inertial filter solution quality. In lower accuracy GNSS position modes, such as SINGLE or WAAS (see Table: Position or Velocity Type), the position standard deviation values can appear to become optimistic compared with the absolute GNSS accuracy. This is due to the INS filter’s ability to smooth short term noise in the GNSS solution, although the overall position error envelope still reflects the GNSS accuracy. Therefore, if the desired application requires absolute GNSS position accuracy, it is recommended to also monitor GNSS position messages such as BESTGNSSPOS (see BESTGNSSPOS log).