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pprz_geodetic_int.c
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pprz_geodetic_int.c
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/*
* $Id$
*
* Copyright (C) 2008-2009 Antoine Drouin <poinix@gmail.com>
*
* This file is part of paparazzi.
*
* paparazzi 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, or (at your option)
* any later version.
*
* paparazzi 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 paparazzi; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "pprz_geodetic_int.h"
#include "pprz_algebra_int.h"
#define HIGH_RES_TRIG_FRAC 20
void ltp_def_from_ecef_i(struct LtpDef_i* def, struct EcefCoor_i* ecef) {
/* store the origin of the tangeant plane */
VECT3_COPY(def->ecef, *ecef);
/* compute the lla representation of the origin */
lla_of_ecef_i(&def->lla, &def->ecef);
/* store the rotation matrix */
#if 1
int32_t sin_lat = rint(BFP_OF_REAL(sinf(RAD_OF_EM7RAD((float)def->lla.lat)), HIGH_RES_TRIG_FRAC));
int32_t cos_lat = rint(BFP_OF_REAL(cosf(RAD_OF_EM7RAD((float)def->lla.lat)), HIGH_RES_TRIG_FRAC));
int32_t sin_lon = rint(BFP_OF_REAL(sinf(RAD_OF_EM7RAD((float)def->lla.lon)), HIGH_RES_TRIG_FRAC));
int32_t cos_lon = rint(BFP_OF_REAL(cosf(RAD_OF_EM7RAD((float)def->lla.lon)), HIGH_RES_TRIG_FRAC));
#else
int32_t sin_lat = rint(BFP_OF_REAL(sin(RAD_OF_EM7RAD((double)def->lla.lat)), HIGH_RES_TRIG_FRAC));
int32_t cos_lat = rint(BFP_OF_REAL(cos(RAD_OF_EM7RAD((double)def->lla.lat)), HIGH_RES_TRIG_FRAC));
int32_t sin_lon = rint(BFP_OF_REAL(sin(RAD_OF_EM7RAD((double)def->lla.lon)), HIGH_RES_TRIG_FRAC));
int32_t cos_lon = rint(BFP_OF_REAL(cos(RAD_OF_EM7RAD((double)def->lla.lon)), HIGH_RES_TRIG_FRAC));
#endif
def->ltp_of_ecef.m[0] = -sin_lon;
def->ltp_of_ecef.m[1] = cos_lon;
def->ltp_of_ecef.m[2] = 0; /* this element is always zero http://en.wikipedia.org/wiki/Geodetic_system#From_ECEF_to_ENU */
def->ltp_of_ecef.m[3] = (int32_t)((-(int64_t)sin_lat*(int64_t)cos_lon)>>HIGH_RES_TRIG_FRAC);
def->ltp_of_ecef.m[4] = (int32_t)((-(int64_t)sin_lat*(int64_t)sin_lon)>>HIGH_RES_TRIG_FRAC);
def->ltp_of_ecef.m[5] = cos_lat;
def->ltp_of_ecef.m[6] = (int32_t)(( (int64_t)cos_lat*(int64_t)cos_lon)>>HIGH_RES_TRIG_FRAC);
def->ltp_of_ecef.m[7] = (int32_t)(( (int64_t)cos_lat*(int64_t)sin_lon)>>HIGH_RES_TRIG_FRAC);
def->ltp_of_ecef.m[8] = sin_lat;
}
void ltp_def_from_lla_i(struct LtpDef_i* def, struct LlaCoor_i* lla) {
/* store the origin of the tangeant plane */
LLA_COPY(def->lla, *lla);
/* compute the ecef representation of the origin */
ecef_of_lla_i(&def->ecef, &def->lla);
/* store the rotation matrix */
#if 1
int32_t sin_lat = rint(BFP_OF_REAL(sinf(RAD_OF_EM7RAD((float)def->lla.lat)), HIGH_RES_TRIG_FRAC));
int32_t cos_lat = rint(BFP_OF_REAL(cosf(RAD_OF_EM7RAD((float)def->lla.lat)), HIGH_RES_TRIG_FRAC));
int32_t sin_lon = rint(BFP_OF_REAL(sinf(RAD_OF_EM7RAD((float)def->lla.lon)), HIGH_RES_TRIG_FRAC));
int32_t cos_lon = rint(BFP_OF_REAL(cosf(RAD_OF_EM7RAD((float)def->lla.lon)), HIGH_RES_TRIG_FRAC));
#else
int32_t sin_lat = rint(BFP_OF_REAL(sin(RAD_OF_EM7RAD((double)def->lla.lat)), HIGH_RES_TRIG_FRAC));
int32_t cos_lat = rint(BFP_OF_REAL(cos(RAD_OF_EM7RAD((double)def->lla.lat)), HIGH_RES_TRIG_FRAC));
int32_t sin_lon = rint(BFP_OF_REAL(sin(RAD_OF_EM7RAD((double)def->lla.lon)), HIGH_RES_TRIG_FRAC));
int32_t cos_lon = rint(BFP_OF_REAL(cos(RAD_OF_EM7RAD((double)def->lla.lon)), HIGH_RES_TRIG_FRAC));
#endif
def->ltp_of_ecef.m[0] = -sin_lon;
def->ltp_of_ecef.m[1] = cos_lon;
def->ltp_of_ecef.m[2] = 0; /* this element is always zero http://en.wikipedia.org/wiki/Geodetic_system#From_ECEF_to_ENU */
def->ltp_of_ecef.m[3] = (int32_t)((-(int64_t)sin_lat*(int64_t)cos_lon)>>HIGH_RES_TRIG_FRAC);
def->ltp_of_ecef.m[4] = (int32_t)((-(int64_t)sin_lat*(int64_t)sin_lon)>>HIGH_RES_TRIG_FRAC);
def->ltp_of_ecef.m[5] = cos_lat;
def->ltp_of_ecef.m[6] = (int32_t)(( (int64_t)cos_lat*(int64_t)cos_lon)>>HIGH_RES_TRIG_FRAC);
def->ltp_of_ecef.m[7] = (int32_t)(( (int64_t)cos_lat*(int64_t)sin_lon)>>HIGH_RES_TRIG_FRAC);
def->ltp_of_ecef.m[8] = sin_lat;
}
void enu_of_ecef_point_i(struct EnuCoor_i* enu, struct LtpDef_i* def, struct EcefCoor_i* ecef) {
struct EcefCoor_i delta;
VECT3_DIFF(delta, *ecef, def->ecef);
const int64_t tmpx = (int64_t)def->ltp_of_ecef.m[0]*delta.x +
(int64_t)def->ltp_of_ecef.m[1]*delta.y +
0; /* this element is always zero http://en.wikipedia.org/wiki/Geodetic_system#From_ECEF_to_ENU */
enu->x = (int32_t)(tmpx>>HIGH_RES_TRIG_FRAC);
const int64_t tmpy = (int64_t)def->ltp_of_ecef.m[3]*delta.x +
(int64_t)def->ltp_of_ecef.m[4]*delta.y +
(int64_t)def->ltp_of_ecef.m[5]*delta.z;
enu->y = (int32_t)(tmpy>>HIGH_RES_TRIG_FRAC);
const int64_t tmpz = (int64_t)def->ltp_of_ecef.m[6]*delta.x +
(int64_t)def->ltp_of_ecef.m[7]*delta.y +
(int64_t)def->ltp_of_ecef.m[8]*delta.z;
enu->z = (int32_t)(tmpz>>HIGH_RES_TRIG_FRAC);
}
void ned_of_ecef_point_i(struct NedCoor_i* ned, struct LtpDef_i* def, struct EcefCoor_i* ecef) {
struct EnuCoor_i enu;
enu_of_ecef_point_i(&enu, def, ecef);
ENU_OF_TO_NED(*ned, enu);
}
void enu_of_ecef_vect_i(struct EnuCoor_i* enu, struct LtpDef_i* def, struct EcefCoor_i* ecef) {
const int64_t tmpx = (int64_t)def->ltp_of_ecef.m[0]*ecef->x +
(int64_t)def->ltp_of_ecef.m[1]*ecef->y +
0; /* this element is always zero http://en.wikipedia.org/wiki/Geodetic_system#From_ECEF_to_ENU */
enu->x = (int32_t)(tmpx>>HIGH_RES_TRIG_FRAC);
const int64_t tmpy = (int64_t)def->ltp_of_ecef.m[3]*ecef->x +
(int64_t)def->ltp_of_ecef.m[4]*ecef->y +
(int64_t)def->ltp_of_ecef.m[5]*ecef->z;
enu->y = (int32_t)(tmpy>>HIGH_RES_TRIG_FRAC);
const int64_t tmpz = (int64_t)def->ltp_of_ecef.m[6]*ecef->x +
(int64_t)def->ltp_of_ecef.m[7]*ecef->y +
(int64_t)def->ltp_of_ecef.m[8]*ecef->z;
enu->z = (int32_t)(tmpz>>HIGH_RES_TRIG_FRAC);
}
void ned_of_ecef_vect_i(struct NedCoor_i* ned, struct LtpDef_i* def, struct EcefCoor_i* ecef) {
struct EnuCoor_i enu;
enu_of_ecef_vect_i(&enu, def, ecef);
ENU_OF_TO_NED(*ned, enu);
}
/* check if resolution of INT32_TRIG_FRAC (14) is enough here */
void ecef_of_enu_point_i(struct EcefCoor_i* ecef, struct LtpDef_i* def, struct EnuCoor_i* enu) {
INT32_RMAT_TRANSP_VMULT(*ecef, def->ltp_of_ecef, *enu);
INT32_VECT3_ADD(*ecef, def->ecef);
}
void ecef_of_ned_point_i(struct EcefCoor_i* ecef, struct LtpDef_i* def, struct NedCoor_i* ned) {
struct EnuCoor_i enu;
ENU_OF_TO_NED(enu, *ned);
ecef_of_enu_point_i(ecef, def, &enu);
}
void ecef_of_enu_vect_i(struct EcefCoor_i* ecef, struct LtpDef_i* def, struct EnuCoor_i* enu) {
INT32_RMAT_TRANSP_VMULT(*ecef, def->ltp_of_ecef, *enu);
}
void ecef_of_ned_vect_i(struct EcefCoor_i* ecef, struct LtpDef_i* def, struct NedCoor_i* ned) {
struct EnuCoor_i enu;
ENU_OF_TO_NED(enu, *ned);
ecef_of_enu_vect_i(ecef, def, &enu);
}
void enu_of_lla_point_i(struct EnuCoor_i* enu, struct LtpDef_i* def, struct LlaCoor_i* lla) {
struct EcefCoor_i ecef;
ecef_of_lla_i(&ecef,lla);
enu_of_ecef_point_i(enu,def,&ecef);
}
void ned_of_lla_point_i(struct NedCoor_i* ned, struct LtpDef_i* def, struct LlaCoor_i* lla) {
struct EcefCoor_i ecef;
ecef_of_lla_i(&ecef,lla);
ned_of_ecef_point_i(ned,def,&ecef);
}
void enu_of_lla_vect_i(struct EnuCoor_i* enu, struct LtpDef_i* def, struct LlaCoor_i* lla) {
struct EcefCoor_i ecef;
ecef_of_lla_i(&ecef,lla);
enu_of_ecef_vect_i(enu,def,&ecef);
}
void ned_of_lla_vect_i(struct NedCoor_i* ned, struct LtpDef_i* def, struct LlaCoor_i* lla) {
struct EcefCoor_i ecef;
ecef_of_lla_i(&ecef,lla);
ned_of_ecef_vect_i(ned,def,&ecef);
}
/*
For now we cheat and call the floating point version
Anyone up for writing it in fixed point ?
*/
#include "pprz_geodetic_float.h"
#include "pprz_geodetic_double.h"
void lla_of_ecef_i(struct LlaCoor_i* out, struct EcefCoor_i* in) {
/* convert our input to floating point */
struct EcefCoor_d in_d;
in_d.x = M_OF_CM((double)in->x);
in_d.y = M_OF_CM((double)in->y);
in_d.z = M_OF_CM((double)in->z);
/* calls the floating point transformation */
struct LlaCoor_d out_d;
lla_of_ecef_d(&out_d, &in_d);
/* convert the output to fixed point */
out->lon = (int32_t)rint(EM7RAD_OF_RAD(out_d.lon));
out->lat = (int32_t)rint(EM7RAD_OF_RAD(out_d.lat));
out->alt = (int32_t)CM_OF_M(out_d.alt);
}
void ecef_of_lla_i(struct EcefCoor_i* out, struct LlaCoor_i* in) {
/* convert our input to floating point */
struct LlaCoor_d in_d;
in_d.lon = RAD_OF_EM7RAD((double)in->lon);
in_d.lat = RAD_OF_EM7RAD((double)in->lat);
in_d.alt = M_OF_CM((double)in->alt);
/* calls the floating point transformation */
struct EcefCoor_d out_d;
ecef_of_lla_d(&out_d, &in_d);
/* convert the output to fixed point */
out->x = (int32_t)CM_OF_M(out_d.x);
out->y = (int32_t)CM_OF_M(out_d.y);
out->z = (int32_t)CM_OF_M(out_d.z);
}