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190-00228-20 GPS 16/17 Technical Specifications Rev. C
Page 27
double lon;
float lon_vel;
float lat_vel;
float alt_vel;
float msl_hght;
int leap_sec;
long grmn_days;
} cpo_pvt_data;
alt Ellipsoid altitude (meters)
epe Est pos error (meters)
eph Pos err, horizontal (meters)
epv Pos err, vertical (meters)
fix 0 = no fix; 1 = no fix; 2 = 2D; 3 = 3D; 4 = 2D differential; 5 = 3D differential;
6 and greater = not defined
gps_tow GPS time of week (sec)
lat Latitude (radians)
lon Longitude (radians)
lon_vel Longitude velocity (meters/second)
lat_vel Latitude velocity (meters/second)
alt_vel Altitude velocity (meters/ second)
msl_hght Mean sea level height (meters)
leap_sec UTC leap seconds
grmn_days Garmin days (days since December 31, 1989)
Receiver Measurement Record
- 0x10 (DLE is first byte)
- 0x34 (Receiver record identifier)
- 0xE2 (Size of data)
- cpo_rcv_data (See below)
- one byte checksum (The sum of bytes between the delimiters should equal 0)
- 0x10 (DLE)
- 0x03 (ETX)
typedef struct
{
unsigned long cycles;
double pr;
unsigned int phase;
char slp_dtct;
unsigned char snr_dbhz;
char svid;
char valid;
} cpo_rcv_sv_data;
typedef struct
{
double rcvr_tow;
int rcvr_wn;
cpo_rcv_sv_data sv[ 12 ];
} cpo_rcv_data;
rcvr_tow Receiver time of week (seconds)
rcvr_wn Receiver week number
cycles Number of accumulated cycles
pr Pseudorange (meters)
phase To convert to (0 -359.999) multiply by 360.0 and divide by 2048.0
slp_dtct 0 = no cycle slip detected; non-zero = cycle slip detected
snr_dbhz Signal strength
svid Satellite number (0 to 31) Note: add 1 to offset to current svid numbers
valid 0 = information not valid; non-zero = information valid