GXB2000 Datasheet, PDF (60/60 Pages) Sony Corporation – 16-Channel GPS Receiver Module

GXB2000
3-3. DARC Data Input
DARC data is output in the communication format noted below. The D-GPS basic data is located in the D-GPS
segments. The D-GPS basic data is comprised of 288 bits (36 bytes).
Data packet 1
22 bytes
Prefix
4 bytes
D-GPS
segment
18 bytes
Data packet 2
22 bytes
Prefix
2 bytes
D-GPS
segment
18 bytes
CRC
2 bytes
Checksum
1 byte
xxh
Terminator
1 byte
0Dh
The D-GPS basic data configuration is as follows.
Bit position
Description
1 to 3 D-GPS data ID
4
Correction time
5 to 38 1st GPS satellite correction data
39 to 72 2nd GPS satellite correction data
73 to 106 3rd GPS satellite correction data
107 to 140 4th GPS satellite correction data
141 to 174 5th GPS satellite correction data
175 to 208 6th GPS satellite correction data
209 to 242 7th GPS satellite correction data
243 to 276 8th GPS satellite correction data
277 to 288 Communication data
The GPS satellite correction data configuration is as follows.
Bit position
Description
1
Scale factor
2 to 3 UDRE (User differential range error index)
4 to 8 GPS satellite ID
9 to 19 PRC (Pseudorange correction value)
20 to 26 RRC (Pseudorange rate-of-change correction value)
27 to 34 IODE (Ephemeris data issue No.)
Number of bits
3 bits
1 bit
34 bits
34 bits
34 bits
34 bits
34 bits
34 bits
34 bits
34 bits
12 bits
Number of bits
1 bit
2 bits
5 bits
11 bits
7 bits
8 bits
SS-31