GXB2000 datasheet(16/60 Pages) SONY

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S-8

GXB2000

1-2-3. Almanac data output

No.

BIT

76543210

Contents

Setting value

Output data

(HEX)

10100100

0xxxxxxx

11011010

Header

Terminator. "Z" + 80H

—

Example

After the receiver receives an almanac output request, it transmits a response and then outputs the almanac

data. The above format is for 1 subframe of the almanac data, and 64 frames of this data are sent in

succession. Almanac communication data is sent by dividing the original data into 7-bit sections.

The almanac data stored in the GPS receiver memory has the configuration shown below. Normally each word

of the almanac data has 6-bit parity, but this is eliminated when the data is stored in the memory. In addition, a

16-bit checksum is added in consideration of communication.

WORD1

24 bits

WORD2

24 bits

WORD3

24 bits

WORD4

24 bits

WORD5

24 bits

WORD6

24 bits

WORD7

24 bits

WORD8

24 bits

WORD9

24 bits

WORD10

24 bits

Checksum

16 bits

The relationship between the above

data and the communication data is

shown to the right.

(1) Relationship between word data and communication data

Before conversion

After conversion

0 0 0 0

Before conversion

After conversion

0 0 0 0 0

(2) Relationship between checksum and communication data

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