diff options
author | Eric S. Raymond <esr@thyrsus.com> | 2011-09-18 07:41:36 -0400 |
---|---|---|
committer | Eric S. Raymond <esr@thyrsus.com> | 2011-09-18 07:41:36 -0400 |
commit | e11a617ab0943bfad775f051a1b256010132a420 (patch) | |
tree | 894addb33e13c13f2a10ed4a38bc489a20eb0973 | |
parent | 5398d10dc20ef7433818f422396b80475b6a8b22 (diff) | |
download | gpsd-e11a617ab0943bfad775f051a1b256010132a420.tar.gz |
Sort out some issues with PRN handling.
Add macros for classifying PRNs into GPS, GLONASS, DGPS. Document the PRN
ranges on the gps_json manual page.
It turns out that U.S. GPS authorities reserve 1-64 for GPS birds, not just
1-32. So the way we map GLONASS PRNs had to change. This required a
regression-test rebuild for the geostar driver.
-rw-r--r-- | driver_geostar.c | 2 | ||||
-rw-r--r-- | driver_sirf.c | 5 | ||||
-rw-r--r-- | driver_ubx.c | 2 | ||||
-rw-r--r-- | gps.h | 11 | ||||
-rw-r--r-- | gpsd_json.xml | 7 | ||||
-rw-r--r-- | test/daemon/geostar-geos1m-binary.log.chk | 440 |
6 files changed, 241 insertions, 226 deletions
diff --git a/driver_geostar.c b/driver_geostar.c index 0d56b233..9b771409 100644 --- a/driver_geostar.c +++ b/driver_geostar.c @@ -29,7 +29,7 @@ static int decode_channel_id (uint32_t ch_id) { int num = 0; num = (int)(ch_id & 0x1F); /* SV ID */ - if((ch_id & (1<<30)) == 0) num += 32; /* GLONASS SV */ + if((ch_id & (1<<30)) == 0) num += 64; /* GLONASS SV */ else if (num == 0 ) num = 32; /* GPS SV */ return num; } diff --git a/driver_sirf.c b/driver_sirf.c index 3503408a..d6638369 100644 --- a/driver_sirf.c +++ b/driver_sirf.c @@ -2,7 +2,8 @@ * This is the gpsd driver for SiRF GPSes operating in binary mode. * It also handles uBlox, a SiRF derivative. * - * The advantage: Reports climb/sink rate (raw-mode clients won't see this). + * The advantages: Reports climb/sink rate (raw-mode clients won't see this). + * Also, we can flag DGPS satellites used in the skyview when SBAS is in use. * The disadvantages: Doesn't return PDOP or VDOP, just HDOP. * * Chris Kuethe, our SiRF expert, tells us: @@ -511,7 +512,7 @@ static gps_mask_t sirf_msg_svinfo(struct gps_device_t *session, session->gpsdata.satellites_visible = st; /* mark SBAS sats in use if SBAS was in use as of the last MID 27 */ for (i = 0; i < st; i++) - if (session->gpsdata.PRN[i] > 100 && session->driver.sirf.sbas != 0) + if (DGPS_PRN(session->gpsdata.PRN[i]) && session->driver.sirf.sbas != 0) session->gpsdata.used[i] = true; #ifdef NTPSHM_ENABLE if (st < 3) { diff --git a/driver_ubx.c b/driver_ubx.c index 1a737402..d5a82c18 100644 --- a/driver_ubx.c +++ b/driver_ubx.c @@ -229,7 +229,7 @@ ubx_msg_nav_svinfo(struct gps_device_t *session, unsigned char *buf, } /* mark SBAS sats in use if SBAS was in use as of the last MID 27 */ for (i = 0; i < j; i++) - if (session->gpsdata.PRN[i] > 100 && session->driver.sirf.sbas != 0) + if (DGPS_PRN(session->gpsdata.PRN[i]) && session->driver.sirf.sbas != 0) session->gpsdata.used[i] = true; session->gpsdata.skyview_time = NAN; session->gpsdata.satellites_visible = (int)st; @@ -96,6 +96,17 @@ struct gps_fix_t { double epc; /* Vertical speed uncertainty */ }; +/* + * Satellite ID classes. + * U.S. GPS authorities reserve PRNs 1-64 for GPS satellites. + * GLONASS birds reuse GPS PRNs; it is a GPSD convention to map them to + * IDs 64 and above (some other programs push them to 33 and above). + * All SBAS/WAAS/EGNOS birds have PRNs above 100. + */ +#define GNSS_PRN(n) (((n) >= 1) && ((n) <= 63)) /* GNSS satellite */ +#define GLONASS_PRN(n) (((n) >= 64) && ((n) <= 96)) /* GLONASS satellite */ +#define DGPS_PRN(n) ((n) >= 100) + /* * The structure describing the pseudorange errors (GPGST) */ diff --git a/gpsd_json.xml b/gpsd_json.xml index 40615936..ab67003b 100644 --- a/gpsd_json.xml +++ b/gpsd_json.xml @@ -388,7 +388,8 @@ error modeling than the covariance calculation.</para> <entry>PRN</entry> <entry>Yes</entry> <entry>numeric</entry> - <entry>PRN ID of the satellite</entry> + <entry>PRN ID of the satellite. 1-63 are GNSS satellites, + 64-96 are GLONASS satellites, 100-164 are SBAS satellites</entry> </row> <row> <entry>az</entry> @@ -412,7 +413,9 @@ error modeling than the covariance calculation.</para> <entry>used</entry> <entry>Yes</entry> <entry>boolean</entry> - <entry>Used in current solution?</entry> + <entry>Used in current solution? (SBAS/WAAS/EGNOS satellites + may be flagged used if the solution has corrections from them, + but not all drivers make this information available.)</entry> </row> </tbody> </tgroup> diff --git a/test/daemon/geostar-geos1m-binary.log.chk b/test/daemon/geostar-geos1m-binary.log.chk index e2c54d38..4b62d814 100644 --- a/test/daemon/geostar-geos1m-binary.log.chk +++ b/test/daemon/geostar-geos1m-binary.log.chk @@ -1,599 +1,599 @@ -$GPGSV,6,1,21,35,12,002,40,36,22,053,51,37,08,102,40,42,38,187,00*71
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