Specifications

VP ONCORE COMMAND REFERENCE
8 CHANNEL POSITION/STATUS/DATA
MESSAGE (@@Ea)
continued
Velocity
vv - velocity in cm/s 0 .. 51,400 (0 .. 514.00 m/s)
hh - heading 0 .. 3,599 (0.0 .. 359.9º)
(true north res 0.1º)
Geometry
dd - current DOP (0.1 res) 0 .. 999 (0.0 to 99.9 DOP)
(0 = not computable, position-hold, or
position propagate)
t - DOP type 0 = PDOP (have 3D fix)
1 = HDOP (have 2D fix)
Satellite visibility and tracking status
n - num of visible sats 0 .. 12
t - num of satellites tracked 0 .. 8
For each of eight receiver channels
i - sat ID 0 .. 37
m - channel tracking mode 0 .. 8
0 = code search 5 = message sync detect
1 = code acquire 6 = satellite time available
2 = AGC set 7 = ephemeris acquire
3 = freq acquire 8 = avail for position
4 = bit sync detect
s – Signal Strength 0 .. 255 (number proportional to
SNR)
d - Channel Status Flag
Each bit represents one of the following:
(msb) Bit 7: using for position fix
Bit 6: satellite momentum alert flag
Bit 5: satellite anti-spoof flag set
Bit 4: satellite reported unhealthy
Bit 3: satellite reported inaccurate (> 16 m)
Bit 2: spare
Bit 1: spare
(lsb) Bit 0: parity error
(End of channel dependent data)
s - Receiver Status Byte
(msb) Bit 7: position propagate mode
Bit 6: poor geometry (DOP > 20)
Bit 5: 3D fix
Bit 4: 2D fix
Bit 3: acquiring satellites/position hold
Bit 2: differential fix
Bit 1: insufficient visible satellites (< 3)
(lsb) Bit 0: bad almanac
C - checksum
Message length: 76 bytes
126 Synergy Systems, LLC 05OCT01