GXB2000 datasheet(25/60 Pages) SONY

25 / 60 page

S-17

GXB2000

2-2. RTCM Data Input

RTCM data input conforms to the RTCM SC-104 format and supports message type 1.

The message type shared header and message type 1 format are shown below. These data are sent in the "6

of 8" format. In this format, each word is divided into 6-bit units, the bits are reordered so that the LSB comes

first and the MSB comes last, and then "01" is added to the head of the bits.

2-2-1. Message type shared header

PREAMBLE

STATION ID

PARITY

6bit

10bit

6bit

8bit

WORD1

MESSAGE

TYPE

MODIFIED Z-COUNT

PARITY

STATION HEALTH

SEQ NCE NO.

LENGTH OF FRAME

6bit

3bit

5bit

3bit

13bit

WORD2

PREAMBLE:

Preamble

MESSAGE TYPE:

Message type

STATION ID:

Reference station ID No.

PARITY:

Error correction code

MODIFIED Z-COUNT:

Modified Z-count

SEQ NCE NO.:

Frame sequence No.

LENGTH OF FRAME:

Frame length

STATION HEALTH:

Reference station health

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