Garmin GPS 16 Series Technische specificaties - Pagina 30

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Garmin GPS 16 Series Technische specificaties
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 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)

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