GXB2000 Datasheet, PDF (25/60 Pages) Sony Corporation – 16-Channel GPS Receiver Module

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
1
PREAMBLE
MESSAGE
TYPE
STATION ID
8bit
6bit
10bit
30
PARITY
WORD1
6bit
LENGTH OF FRAME
SEQ NCE NO.
STATION HEALTH
1
30
MODIFIED Z-COUNT
PARITY
WORD2
13bit
3bit 5bit 3bit 6bit
PREAMBLE:
MESSAGE TYPE:
STATION ID:
PARITY:
MODIFIED Z-COUNT:
SEQ NCE NO.:
LENGTH OF FRAME:
STATION HEALTH:
Preamble
Message type
Reference station ID No.
Error correction code
Modified Z-count
Frame sequence No.
Frame length
Reference station health
S-17