GXB2000 Datasheet, PDF (57/60 Pages) Sony Corporation – 16-Channel GPS Receiver Module

GXB2000
3-2. 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.
3-2-1. 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:
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
SS-28