Garmin GPS 16-LVS Specyfikacja techniczna - Strona 30

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Garmin GPS 16-LVS Specyfikacja techniczna

The status bit field represents a set of booleans described below:

Bit

The unit has ephemeris data for the specified satellite.

The unit has a differential correction for the specified satellite.

The unit is using this satellite in the solution.

This pattern is repeated for all 12 channels for a total of 12 X 7 bytes = 84 (0x54) bytes :

typedef

struct

{

cpo_sat_data

} cpo_all_sat_data

The RS-232 Packet for the Satellite Record looks like:

- 0x10

(DLE is first byte)

- 0x72

(Record ID – single byte)

- 0x54

(Number of data bytes – single byte)

- cpo_all_sat_data

- 0x##

(2's complement of the arithmetic sum of the bytes between the delimiters)

- 0x10

(DLE)

- 0x03

(ETX is last byte)

Position Record

- 0x10

(DLE is first byte)

- 0x33

(Position record identifier)

- 0x40

(Size of data)

- cpo_pvt_data

(See description below)

- one-byte checksum

(The addition of bytes between the delimiters should equal 0)

- 0x10

(DLE)

- 0x03

(ETX is last byte)

typedef struct

{

float

alt;

float

epe;

float

eph;

float

epv;

int

fix;

double

gps_tow;

double

lat;

190-00228-20

Meaning when bit is one (1)

GPS 16/17 Technical Specifications

Page 26

Rev. C