Garmin 010-00625-00 - Mobile - For BlackBerry Spécifications techniques - Page 18

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Garmin 010-00625-00 - Mobile - For BlackBerry Spécifications techniques
Satellite Data Record
The satellite data has a record ID of 0x72 with 84 (0x54) data bytes. The data bytes contain the data for the
12 channels as described below. For each satellite, the following data is available:
typedef
struct
{
uint8
svid;
uint16
snr;
uint8
elev;
uint16
azmth;
uint8
status;
} cpo_sat_data;
The status bit field represents a set of booleans described below:
Bit
Meaning when bit is one (1)
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 all 12 channels for a total of 12 X 7 bytes = 84 (0x54) bytes :
typedef
struct
{
cpo_sat_data
cpo_sat_data
cpo_sat_data
cpo_sat_data
cpo_sat_data
cpo_sat_data
cpo_sat_data
cpo_sat_data
cpo_sat_data
cpo_sat_data
cpo_sat_data
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)
The USB Packet for the Satellite Record looks like:
38
INDIAN - Thailand, Vietnam
- 0x72
(Record ID – single byte)
- 0x54
(Number of data bytes – single byte)
-
cpo_all_sat_data
190-00769-00
//space vehicle identification (1-32 and 33-64 for WAAS)
//signal-to-noise ratio
//satellite elevation in degrees
//satellite azimuth in degrees
//status bit-field
GPS 10x Technical Specifications
Page 14
Rev. A