GXB2000 datasheet(28/60 Pages) SONY

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S-20

GXB2000

2-3. 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).

The D-GPS basic data configuration is as follows.

The GPS satellite correction data configuration is as follows.

Data packet 1

22 bytes

Data packet 2

22 bytes

Checksum

1 byte

Terminator

1 byte

Prefix

4 bytes

Bit position

1 to 3

5 to 38

39 to 72

73 to 106

107 to 140

141 to 174

175 to 208

209 to 242

243 to 276

277 to 288

Description

D-GPS data ID

Correction time

1st GPS satellite correction data

2nd GPS satellite correction data

3rd GPS satellite correction data

4th GPS satellite correction data

5th GPS satellite correction data

6th GPS satellite correction data

7th GPS satellite correction data

8th GPS satellite correction data

Communication data

Number of bits

3 bits

1 bit

34 bits

12 bits

D-GPS

segment

18 bytes

Prefix

2 bytes

D-GPS

segment

18 bytes

CRC

2 byte

xxh

0Dh

Bit position

2 to 3

4 to 8

9 to 19

20 to 26

27 to 34

Description

Scale factor

UDRE (User differential range error index)

GPS satellite ID

PRC (Pseudorange correction value)

RRC (Pseudorange rate-of-change correction value)

IODE (Ephemeris data issue No.)

Number of bits

1 bit

2 bits

5 bits

11 bits

7 bits

8 bits

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