NavCom LAND-PAK Rev.N User Manual
Page 146
Technical Reference Manual Rev. N
Blk = All;
Blu = IOP w/Internal Radio
;
Red = IOP & LBM
;
Grn = Engine only
144
0xb9 - Apparent Doppler block – Length 4 + 7 + (N * 9) bytes
Where N is the number of channels tracking satellites.
Schedule this block On Change only and it follows the 0xB0 output rate.
Record
Usage
Command - No
Response - Yes
Input: Not used;
Output: reports measured Doppler shift for each satellite under track
Ref
Message Field Description
Data
Type
Units
Range
Scale
Byte
Count
STX
02
(hex)
U08
1
PRA1 99 (hex)
U08
1
PRA2 66 (hex)
U08
1
ID
b9 (hex)
U08
1
Length 0x00xx (11 + count*9)
U16
2
W1
GPS Week – from 6 Jan 1980
U16
0 - 65535
2
W2
GPS milliseconds in week
U32 ms
0 -
604799999
4
W3
Count (The number of Doppler records
to follow)
U08
1
Repetitive Blocks
Wn1
Status
B0-B4: SVID; Satellite PRN number
B5: L1 Valid; Same as B0 Valid bit
for L1
B6: L2 Valid; Same as B0 Valid bit
for L2
B7: Reserved
U08
1
Wn2
L1 Doppler (resolution to 0.001 Hz)
S32 Hz
Lsb: 1/1024
4
Wn3
L2 Doppler (resolution to 0.001 Hz)
S32 Hz
Lsb: 1/1024
4
CKSM Checksum
U08
1
ETX
03
(hex)
U08
1