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Diffstat (limited to 'rrlp-ephemeris/gps.h')
| -rw-r--r-- | rrlp-ephemeris/gps.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/rrlp-ephemeris/gps.h b/rrlp-ephemeris/gps.h new file mode 100644 index 000000000..f6f7cc07b --- /dev/null +++ b/rrlp-ephemeris/gps.h @@ -0,0 +1,171 @@ +/* + * gps.h + * + * Header to deal with low level GPS data + * + * + * Copyright (C) 2009 Sylvain Munaut <tnt@246tNt.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __GPS_H__ +#define __GPS_H__ + +#ifdef __cplusplus +extern "C" { +#endif + +#include <stdint.h> + + +#define MAX_SV 64 + + +/* Ionosperic model data */ +struct gps_ionosphere_model { + /* #bits Scale factor Effective Units */ + /* (LSB) range */ + + int alpha_0; /* s 8 2^-30 seconds */ + int alpha_1; /* s 8 2^-27 s / semi-circles */ + int alpha_2; /* s 8 2^-24 s / (semi-circles)^2 */ + int alpha_3; /* s 8 2^-24 s / (semi-circles)^3 */ + int beta_0; /* s 8 2^11 seconds */ + int beta_1; /* s 8 2^14 s / semi-circles */ + int beta_2; /* s 8 2^16 s / (semi-circles)^2 */ + int beta_3; /* s 8 2^16 s / (semi-circles)^3 */ +}; + + +/* UTC model data */ +struct gps_utc_model { + /* #bits Scale factor Effective Units */ + /* (LSB) range */ + + int a0; /* s 32 2^-30 seconds */ + int a1; /* s 24 2^-50 seconds / seconds */ + int delta_t_ls; /* s 8 1 seconds */ + int t_ot; /* u 8 2^12 602,112 seconds */ + int wn_t; /* u 8 1 weeks */ + int wn_lsf; /* u 8 1 weeks */ + int dn; /* u 8 1 7 days */ + int delta_t_lsf;/* s 8 1 seconds */ +}; + + +/* Almanach data */ +struct gps_almanac_sv { + int sv_id; + int sv_health; + + /* #bits Scale factor Effective Units */ + /* (LSB) range */ + + int e; /* u 16 2^-21 */ + int t_oa; /* u 8 2^12 602,112 seconds */ + int ksii; /* s 16 2^-19 semi-circles */ + int omega_dot; /* s 16 2^-38 semi-circles / s */ + int a_powhalf; /* u 24 2^-11 meters */ + int omega_0; /* s 24 2^-23 semi-circles */ + int w; /* s 24 2^-23 semi-circles */ + int m_0; /* s 24 2^-23 semi-circles */ + int a_f0; /* s 11 2^-20 seconds */ + int a_f1; /* s 11 2^-38 seconds / seconds */ +}; + +struct gps_almanac { + int wna; + int n_sv; + struct gps_almanac_sv svs[MAX_SV]; +}; + + +/* Ephemeris data */ +struct gps_ephemeris_sv { + int sv_id; + + /* #bits Scale factor Effective Units */ + /* (LSB) range */ + + int code_on_l2; /* u 2 1 / */ + int week_no; /* u 10 1 week */ + int l2_p_flag; /* u 1 1 / */ + int sv_ura; /* u 4 / / */ + int sv_health; /* u 6 / / */ + int t_gd; /* s 8 2^-31 seconds */ + int iodc; /* u 10 / / */ + int t_oc; /* u 16 2^4 604,784 seconds */ + int a_f2; /* s 8 2^-55 sec / sec^2 */ + int a_f1; /* s 16 2^-43 sec / sec */ + int a_f0; /* s 22 2^-31 seconds */ + + int c_rs; /* s 16 2^-5 meters */ + int delta_n; /* s 16 2^-43 semi-circles / s */ + int m_0; /* s 32 2^-31 semi-circles */ + int c_uc; /* s 16 2^-29 radians */ + unsigned int e; /* u 32 2^-33 0.03 / */ + int c_us; /* s 16 2^-29 radians */ + unsigned int a_powhalf; /* u 32 2^-19 meters^(1/2) */ + int t_oe; /* u 16 2^4 604,784 seconds */ + int fit_flag; /* u 1 / / */ + + int c_ic; /* s 16 2^-29 radians */ + int omega_0; /* s 32 2^-31 semi-circles */ + int c_is; /* s 16 2^-29 radians */ + int i_0; /* s 32 2^-31 semi-circles */ + int c_rc; /* s 16 2^-5 meters */ + int w; /* s 32 2^-31 semi-circles */ + int omega_dot; /* s 24 2^-43 semi-circles / s */ + int idot; /* s 14 2^-43 semi-circles / s */ + + int _rsvd1; /* 23 bits */ + int _rsvd2; /* 24 bits */ + int _rsvd3; /* 24 bits */ + int _rsvd4; /* 16 bits */ + int aodo; /* 8 bits Not sure it needs to be here ... */ +}; + +struct gps_ephemeris { + int n_sv; + struct gps_ephemeris_sv svs[MAX_SV]; +}; + + +/* All assist data */ +#define GPS_FIELD_IONOSPHERE (1<<0) +#define GPS_FIELD_UTC (1<<1) +#define GPS_FIELD_ALMANAC (1<<2) +#define GPS_FIELD_EPHEMERIS (1<<3) + +struct gps_assist_data { + int fields; + struct gps_ionosphere_model ionosphere; + struct gps_utc_model utc; + struct gps_almanac almanac; + struct gps_ephemeris ephemeris; +}; + + +/* GPS Subframe utility methods (see gps.c for details) */ +int gps_unpack_sf123(uint32_t *sf, struct gps_ephemeris_sv *eph); +int gps_unpack_sf45_almanac(uint32_t *sf, struct gps_almanac_sv *alm); + + +#ifdef __cplusplus +} +#endif + +#endif /* __GPS_H__ */ + |