Garmin GPS 17x Технические характеристики - Страница 26
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Satellite Data Record
The satellite data has a record ID of 0x72 with 84 (0x54) data bytes. The data bytes contain data for 12 satellites as
described below.
typedef
struct
{
uint8
svid; //space
SBAS(WAAS/EGNOS/MSAS) )
uint16
snr;
uint8
elev; //satellite elevation in degrees
uint16
azmth;
uint8
status;
} cpo_sat_data;
The status bit field represents a set of booleans described below:
Bit
0
The unit has ephemeris data for the specified satellite.
1
The unit has a differential correction for the specified satellite.
2
The unit is using this satellite in the solution.
This pattern is repeated for 12 satellites for a total of 12 X 7 bytes = 84 (0x54) bytes.
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)
- 12 cpo_sat_data records
- 0x##
(2's complement of the arithmetic sum of the bytes between the delimiters)
- 0x10
(DLE)
- 0x03
(ETX is last byte)
190-00885-07
vehicle
identification
//signal-to-noise ratio
//satellite azimuth in degrees
//status bit-field
Meaning when bit is one (1)
GPS 17x HVS Technical Specifications
Page 22
(1–32
and
33–64
Rev. A
for