Appendix B; Gps Status Screen; Gps Status Screen Structure-First Page; Bad Fix Code - Magellan RoadMate 760 - Automotive GPS Receiver Reference Manual

GPS STATUS Screen Structure-first page

CH
01
02
03
04
05
06
07
08
09
10
11
12
13
14
It is ordered by the channel number from 1 to 12.
Where:
d1: Satellite PRN number, with "e" or "E" to the right means got ephemeris data, "v" or "V" to the right means got verified
ephemeris data (double check). "E" or "V" also means got satellite time for this channel.
d2: Azimuth, in degrees
d3: Elevation angle, in degrees
d4: SNR (signal to noise ratio), it is ratio-Hz, not dB unit
d5: Searching Frequency Offset (Hz)
c1: U – Used for position fix, U – Not used for position fix
c2: Mode of the channel: I- Idle, S-searching, B – Bit sync, R- Reacquisition, T- Tracking, D-tracking and collecting data
d6: Last Bad fix code. 0 means getting fixes. A non-zero value is either waiting for a fix or has a bad fix
d7: Clock Offset (Hz).

Bad fix code

0 PVT_OK :good fix
2 ILLEGAL_ALT: illegal altitude
4 POSITION_JUMP: too big position jump between two epoch (300 miles)
5 ILLEGAL_VELOCITY_OR_ALT: max velocity 951mile
7 TOO_BIG_ACCELERATION
8 TOO_SMALL_ALTITUDE
9 TOO_BIG_ALTITUDE
10 TOO_BIG_PDOP
11 SATS_BELOW_MASK_ANGLE satellite elevation angle is below mask angle
16 ILL_DEFINED_3D_MATRIX 3X3 matrix can not be inverted in 3D fix

GPS Status Screen

PRN AZ EL
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
d1 d2 d3
< -10km or > 17.5km
max 15m around 1.5g
-10000 m
17,500 m
max PDOP 50

Appendix B

Appendix B
SNR FRQ
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
d4 d5
109
U/N
c1 c2 d6
c1 c2 d7
c1 c2
c1 c2
c1 c2
c1 c2
c1 c2
c1 c2
c1 c2
c1 c2
c1 c2
c1 c2
c1 c2
c1 c2