diff options
| author | Eric S. Raymond <esr@thyrsus.com> | 2005-07-04 14:01:55 +0000 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2005-07-04 14:01:55 +0000 |
| commit | 4297add959f50e172a13be374a4ab039b21d93da (patch) | |
| tree | 4a18fa49e523de40998b305be7540ba22061d406 /libgpsd_core.c | |
| parent | ab049fc32676041a7fe2a16abd6cc9dea9f49255 (diff) | |
| download | gpsd-4297add959f50e172a13be374a4ab039b21d93da.tar.gz | |
Be aware of WAAS satellites.
Diffstat (limited to 'libgpsd_core.c')
| -rw-r--r-- | libgpsd_core.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/libgpsd_core.c b/libgpsd_core.c index f8bb839d..2b63fb42 100644 --- a/libgpsd_core.c +++ b/libgpsd_core.c @@ -381,7 +381,22 @@ static void apply_error_model(struct gps_device_t *session) /* only used if the GPS doesn't report estimated position error itself */ #define UERE_NO_DGPS 8.0 /* meters */ #define UERE_WITH_DGPS 2.0 /* meters */ - double uere = ((session->context->dsock<0) ? UERE_NO_DGPS : UERE_WITH_DGPS); + double uere; + int i; + bool waas_active = false; + bool dgps_active = (session->context->dsock<0); + + /* + * If we have a satellite picture that includes a WAAS/Egnos PRN, + * it will ship DGPS corrections. Note: this assumes only WAAS-capable + * GPSes can see these PRNs at all. + */ + if (session->gpsdata.set & SATELLITE_SET) + for (i = 0; i < session->gpsdata.satellites; i++) + if (session->gpsdata.PRN[i] > 32) + waas_active = true; + + uere = ((dgps_active || waas_active) ? UERE_NO_DGPS : UERE_WITH_DGPS); session->gpsdata.fix.ept = 0.005; if ((session->gpsdata.set & HERR_SET)==0 |