Garmin International Inc 00855 Manuel D’Utilisation

GPS 10 Technical Specifications (P/N 190-00516-00)

Rev. A

Page 21

Position Record
The Position Record has a record identifier of

typedef struct

{
float

alt;

float

epe;

float

eph;

float

epv;

int

fix;

double

gps_tow;

double

lat;

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

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

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