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| author | Eric S. Raymond <esr@thyrsus.com> | 2009-09-30 22:03:11 +0000 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2009-09-30 22:03:11 +0000 |
| commit | 97b9548cff261e13a5b592d31add94631ff4dbc9 (patch) | |
| tree | f46a1c984d841d3d2d8d83836d01db57d3e8ccf9 /driver_italk.c | |
| parent | b9f18fea09961f5e7476130a67e4e89379e12571 (diff) | |
| download | gpsd-97b9548cff261e13a5b592d31add94631ff4dbc9.tar.gz | |
Fix computation of epx and epy from eph.
Factor of 1/sqrt(2) has to be applied (on the assumption that epx and
epy are equal).
Diffstat (limited to 'driver_italk.c')
| -rw-r--r-- | driver_italk.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/driver_italk.c b/driver_italk.c index 0bf4f574..47630e79 100644 --- a/driver_italk.c +++ b/driver_italk.c @@ -32,7 +32,7 @@ static gps_mask_t decode_itk_navfix(struct gps_device_t *session, unsigned char unsigned int tow; unsigned short gps_week, flags, cflags, pflags; gps_mask_t mask = 0; - double epx, epy, epz, evx, evy, evz; + double epx, epy, epz, evx, evy, evz, eph; double t; if (len != 296){ @@ -69,7 +69,9 @@ static gps_mask_t decode_itk_navfix(struct gps_device_t *session, unsigned char evz = (double)(getlesl(buf, 7 + 194)/1000.0); ecef_to_wgs84fix(&session->gpsdata, epx, epy, epz, evx, evy, evz); mask |= LATLON_SET | ALTITUDE_SET | SPEED_SET | TRACK_SET | CLIMB_SET ; - session->gpsdata.fix.epx = session->gpsdata.fix.epy = (double)(getlesl(buf, 7 + 252)/100.0); + eph = (double)(getlesl(buf, 7 + 252)/100.0); + /* eph is a circular error, sqrt(epx**2 + epy**2) */ + session->gpsdata.fix.epx = session->gpsdata.fix.epy = eph/sqrt(2); session->gpsdata.fix.eps = (double)(getlesl(buf, 7 + 254)/100.0); #define MAX(a,b) (((a) > (b)) ? (a) : (b)) |