IQ.Pilot Release Commit @ 0798119
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4
iqpilot/common/transformations/SConscript
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4
iqpilot/common/transformations/SConscript
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Import('env')
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transformations = env.Library('transformations', ['orientation.cc', 'coordinates.cc'])
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Export('transformations')
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100
iqpilot/common/transformations/coordinates.cc
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100
iqpilot/common/transformations/coordinates.cc
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#define _USE_MATH_DEFINES
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#include "iqpilot/common/transformations/coordinates.hpp"
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#include <iostream>
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#include <cmath>
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#include <eigen3/Eigen/Dense>
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double a = 6378137; // lgtm [cpp/short-global-name]
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double b = 6356752.3142; // lgtm [cpp/short-global-name]
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double esq = 6.69437999014 * 0.001; // lgtm [cpp/short-global-name]
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double e1sq = 6.73949674228 * 0.001;
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static Geodetic to_degrees(Geodetic geodetic){
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geodetic.lat = RAD2DEG(geodetic.lat);
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geodetic.lon = RAD2DEG(geodetic.lon);
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return geodetic;
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}
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static Geodetic to_radians(Geodetic geodetic){
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geodetic.lat = DEG2RAD(geodetic.lat);
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geodetic.lon = DEG2RAD(geodetic.lon);
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return geodetic;
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}
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ECEF geodetic2ecef(const Geodetic &geodetic) {
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auto g = to_radians(geodetic);
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double xi = sqrt(1.0 - esq * pow(sin(g.lat), 2));
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double x = (a / xi + g.alt) * cos(g.lat) * cos(g.lon);
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double y = (a / xi + g.alt) * cos(g.lat) * sin(g.lon);
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double z = (a / xi * (1.0 - esq) + g.alt) * sin(g.lat);
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return {x, y, z};
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}
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Geodetic ecef2geodetic(const ECEF &e) {
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// Convert from ECEF to geodetic using Ferrari's methods
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// https://en.wikipedia.org/wiki/Geographic_coordinate_conversion#Ferrari.27s_solution
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double x = e.x;
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double y = e.y;
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double z = e.z;
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double r = sqrt(x * x + y * y);
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double Esq = a * a - b * b;
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double F = 54 * b * b * z * z;
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double G = r * r + (1 - esq) * z * z - esq * Esq;
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double C = (esq * esq * F * r * r) / (pow(G, 3));
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double S = cbrt(1 + C + sqrt(C * C + 2 * C));
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double P = F / (3 * pow((S + 1 / S + 1), 2) * G * G);
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double Q = sqrt(1 + 2 * esq * esq * P);
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double r_0 = -(P * esq * r) / (1 + Q) + sqrt(0.5 * a * a*(1 + 1.0 / Q) - P * (1 - esq) * z * z / (Q * (1 + Q)) - 0.5 * P * r * r);
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double U = sqrt(pow((r - esq * r_0), 2) + z * z);
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double V = sqrt(pow((r - esq * r_0), 2) + (1 - esq) * z * z);
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double Z_0 = b * b * z / (a * V);
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double h = U * (1 - b * b / (a * V));
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double lat = atan((z + e1sq * Z_0) / r);
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double lon = atan2(y, x);
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return to_degrees({lat, lon, h});
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}
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LocalCoord::LocalCoord(const Geodetic &geodetic, const ECEF &e) {
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init_ecef << e.x, e.y, e.z;
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auto g = to_radians(geodetic);
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ned2ecef_matrix <<
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-sin(g.lat)*cos(g.lon), -sin(g.lon), -cos(g.lat)*cos(g.lon),
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-sin(g.lat)*sin(g.lon), cos(g.lon), -cos(g.lat)*sin(g.lon),
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cos(g.lat), 0, -sin(g.lat);
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ecef2ned_matrix = ned2ecef_matrix.transpose();
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}
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NED LocalCoord::ecef2ned(const ECEF &e) {
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Eigen::Vector3d ecef;
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ecef << e.x, e.y, e.z;
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Eigen::Vector3d ned = (ecef2ned_matrix * (ecef - init_ecef));
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return {ned[0], ned[1], ned[2]};
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}
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ECEF LocalCoord::ned2ecef(const NED &n) {
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Eigen::Vector3d ned;
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ned << n.n, n.e, n.d;
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Eigen::Vector3d ecef = (ned2ecef_matrix * ned) + init_ecef;
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return {ecef[0], ecef[1], ecef[2]};
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}
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NED LocalCoord::geodetic2ned(const Geodetic &g) {
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ECEF e = ::geodetic2ecef(g);
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return ecef2ned(e);
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}
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Geodetic LocalCoord::ned2geodetic(const NED &n) {
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ECEF e = ned2ecef(n);
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return ::ecef2geodetic(e);
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}
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43
iqpilot/common/transformations/coordinates.hpp
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43
iqpilot/common/transformations/coordinates.hpp
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#pragma once
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#include <eigen3/Eigen/Dense>
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#define DEG2RAD(x) ((x) * M_PI / 180.0)
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#define RAD2DEG(x) ((x) * 180.0 / M_PI)
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struct ECEF {
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double x, y, z;
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Eigen::Vector3d to_vector() const {
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return Eigen::Vector3d(x, y, z);
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}
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};
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struct NED {
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double n, e, d;
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Eigen::Vector3d to_vector() const {
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return Eigen::Vector3d(n, e, d);
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}
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};
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struct Geodetic {
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double lat, lon, alt;
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bool radians=false;
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};
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ECEF geodetic2ecef(const Geodetic &g);
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Geodetic ecef2geodetic(const ECEF &e);
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class LocalCoord {
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public:
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Eigen::Matrix3d ned2ecef_matrix;
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Eigen::Matrix3d ecef2ned_matrix;
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Eigen::Vector3d init_ecef;
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LocalCoord(const Geodetic &g, const ECEF &e);
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LocalCoord(const Geodetic &g) : LocalCoord(g, ::geodetic2ecef(g)) {}
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LocalCoord(const ECEF &e) : LocalCoord(::ecef2geodetic(e), e) {}
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NED ecef2ned(const ECEF &e);
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ECEF ned2ecef(const NED &n);
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NED geodetic2ned(const Geodetic &g);
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Geodetic ned2geodetic(const NED &n);
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};
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143
iqpilot/common/transformations/orientation.cc
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143
iqpilot/common/transformations/orientation.cc
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#define _USE_MATH_DEFINES
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#include <iostream>
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#include <cmath>
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#include <eigen3/Eigen/Dense>
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#include "iqpilot/common/transformations/orientation.hpp"
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#include "iqpilot/common/transformations/coordinates.hpp"
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Eigen::Quaterniond ensure_unique(const Eigen::Quaterniond &quat) {
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if (quat.w() > 0){
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return quat;
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} else {
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return Eigen::Quaterniond(-quat.w(), -quat.x(), -quat.y(), -quat.z());
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}
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}
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Eigen::Quaterniond euler2quat(const Eigen::Vector3d &euler) {
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Eigen::Quaterniond q;
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q = Eigen::AngleAxisd(euler(2), Eigen::Vector3d::UnitZ())
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* Eigen::AngleAxisd(euler(1), Eigen::Vector3d::UnitY())
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* Eigen::AngleAxisd(euler(0), Eigen::Vector3d::UnitX());
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return ensure_unique(q);
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}
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Eigen::Vector3d quat2euler(const Eigen::Quaterniond &quat) {
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// TODO: switch to eigen implementation if the range of the Euler angles doesn't matter anymore
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// Eigen::Vector3d euler = quat.toRotationMatrix().eulerAngles(2, 1, 0);
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// return {euler(2), euler(1), euler(0)};
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double gamma = atan2(2 * (quat.w() * quat.x() + quat.y() * quat.z()), 1 - 2 * (quat.x()*quat.x() + quat.y()*quat.y()));
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double asin_arg_clipped = std::clamp(2 * (quat.w() * quat.y() - quat.z() * quat.x()), -1.0, 1.0);
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double theta = asin(asin_arg_clipped);
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double psi = atan2(2 * (quat.w() * quat.z() + quat.x() * quat.y()), 1 - 2 * (quat.y()*quat.y() + quat.z()*quat.z()));
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return {gamma, theta, psi};
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}
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Eigen::Matrix3d quat2rot(const Eigen::Quaterniond &quat) {
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return quat.toRotationMatrix();
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}
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Eigen::Quaterniond rot2quat(const Eigen::Matrix3d &rot) {
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return ensure_unique(Eigen::Quaterniond(rot));
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}
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Eigen::Matrix3d euler2rot(const Eigen::Vector3d &euler) {
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return quat2rot(euler2quat(euler));
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}
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Eigen::Vector3d rot2euler(const Eigen::Matrix3d &rot) {
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return quat2euler(rot2quat(rot));
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}
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Eigen::Matrix3d rot_matrix(double roll, double pitch, double yaw) {
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return euler2rot({roll, pitch, yaw});
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}
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Eigen::Matrix3d rot(const Eigen::Vector3d &axis, double angle) {
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Eigen::Quaterniond q;
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q = Eigen::AngleAxisd(angle, axis);
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return q.toRotationMatrix();
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}
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Eigen::Vector3d ecef_euler_from_ned(const ECEF &ecef_init, const Eigen::Vector3d &ned_pose) {
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/*
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Using Rotations to Build Aerospace Coordinate Systems
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Don Koks
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https://apps.dtic.mil/dtic/tr/fulltext/u2/a484864.pdf
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*/
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LocalCoord converter = LocalCoord(ecef_init);
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Eigen::Vector3d zero = ecef_init.to_vector();
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Eigen::Vector3d x0 = converter.ned2ecef({1, 0, 0}).to_vector() - zero;
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Eigen::Vector3d y0 = converter.ned2ecef({0, 1, 0}).to_vector() - zero;
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Eigen::Vector3d z0 = converter.ned2ecef({0, 0, 1}).to_vector() - zero;
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Eigen::Vector3d x1 = rot(z0, ned_pose(2)) * x0;
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Eigen::Vector3d y1 = rot(z0, ned_pose(2)) * y0;
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Eigen::Vector3d z1 = rot(z0, ned_pose(2)) * z0;
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Eigen::Vector3d x2 = rot(y1, ned_pose(1)) * x1;
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Eigen::Vector3d y2 = rot(y1, ned_pose(1)) * y1;
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Eigen::Vector3d z2 = rot(y1, ned_pose(1)) * z1;
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Eigen::Vector3d x3 = rot(x2, ned_pose(0)) * x2;
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Eigen::Vector3d y3 = rot(x2, ned_pose(0)) * y2;
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x0 = Eigen::Vector3d(1, 0, 0);
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y0 = Eigen::Vector3d(0, 1, 0);
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z0 = Eigen::Vector3d(0, 0, 1);
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double psi = atan2(x3.dot(y0), x3.dot(x0));
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double theta = atan2(-x3.dot(z0), sqrt(pow(x3.dot(x0), 2) + pow(x3.dot(y0), 2)));
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y2 = rot(z0, psi) * y0;
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z2 = rot(y2, theta) * z0;
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double phi = atan2(y3.dot(z2), y3.dot(y2));
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return {phi, theta, psi};
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}
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Eigen::Vector3d ned_euler_from_ecef(const ECEF &ecef_init, const Eigen::Vector3d &ecef_pose) {
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/*
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Using Rotations to Build Aerospace Coordinate Systems
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Don Koks
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https://apps.dtic.mil/dtic/tr/fulltext/u2/a484864.pdf
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*/
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LocalCoord converter = LocalCoord(ecef_init);
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Eigen::Vector3d x0 = Eigen::Vector3d(1, 0, 0);
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Eigen::Vector3d y0 = Eigen::Vector3d(0, 1, 0);
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Eigen::Vector3d z0 = Eigen::Vector3d(0, 0, 1);
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Eigen::Vector3d x1 = rot(z0, ecef_pose(2)) * x0;
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Eigen::Vector3d y1 = rot(z0, ecef_pose(2)) * y0;
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Eigen::Vector3d z1 = rot(z0, ecef_pose(2)) * z0;
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Eigen::Vector3d x2 = rot(y1, ecef_pose(1)) * x1;
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Eigen::Vector3d y2 = rot(y1, ecef_pose(1)) * y1;
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Eigen::Vector3d z2 = rot(y1, ecef_pose(1)) * z1;
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Eigen::Vector3d x3 = rot(x2, ecef_pose(0)) * x2;
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Eigen::Vector3d y3 = rot(x2, ecef_pose(0)) * y2;
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Eigen::Vector3d zero = ecef_init.to_vector();
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x0 = converter.ned2ecef({1, 0, 0}).to_vector() - zero;
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y0 = converter.ned2ecef({0, 1, 0}).to_vector() - zero;
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z0 = converter.ned2ecef({0, 0, 1}).to_vector() - zero;
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double psi = atan2(x3.dot(y0), x3.dot(x0));
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double theta = atan2(-x3.dot(z0), sqrt(pow(x3.dot(x0), 2) + pow(x3.dot(y0), 2)));
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y2 = rot(z0, psi) * y0;
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z2 = rot(y2, theta) * z0;
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double phi = atan2(y3.dot(z2), y3.dot(y2));
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return {phi, theta, psi};
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}
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17
iqpilot/common/transformations/orientation.hpp
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17
iqpilot/common/transformations/orientation.hpp
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#pragma once
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#include <eigen3/Eigen/Dense>
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#include "iqpilot/common/transformations/coordinates.hpp"
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Eigen::Quaterniond ensure_unique(const Eigen::Quaterniond &quat);
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Eigen::Quaterniond euler2quat(const Eigen::Vector3d &euler);
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Eigen::Vector3d quat2euler(const Eigen::Quaterniond &quat);
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Eigen::Matrix3d quat2rot(const Eigen::Quaterniond &quat);
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Eigen::Quaterniond rot2quat(const Eigen::Matrix3d &rot);
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Eigen::Matrix3d euler2rot(const Eigen::Vector3d &euler);
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Eigen::Vector3d rot2euler(const Eigen::Matrix3d &rot);
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Eigen::Matrix3d rot_matrix(double roll, double pitch, double yaw);
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Eigen::Matrix3d rot(const Eigen::Vector3d &axis, double angle);
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Eigen::Vector3d ecef_euler_from_ned(const ECEF &ecef_init, const Eigen::Vector3d &ned_pose);
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Eigen::Vector3d ned_euler_from_ecef(const ECEF &ecef_init, const Eigen::Vector3d &ecef_pose);
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