mirror of https://github.com/ArduPilot/ardupilot
278 lines
10 KiB
C++
278 lines
10 KiB
C++
/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <AP_Common/AP_Common.h>
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#include <AP_Common/Location.h>
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#include <AP_AHRS/AP_AHRS.h>
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#include <AC_Avoidance/AP_OADatabase.h>
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#include <AP_HAL/AP_HAL.h>
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#include "AP_Proximity.h"
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#include "AP_Proximity_Backend.h"
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/*
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base class constructor.
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This incorporates initialisation as well.
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*/
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AP_Proximity_Backend::AP_Proximity_Backend(AP_Proximity &_frontend, AP_Proximity::Proximity_State &_state) :
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frontend(_frontend),
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state(_state)
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{
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// initialise sector edge vector used for building the boundary fence
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init_boundary();
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}
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// get distance and angle to closest object (used for pre-arm check)
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// returns true on success, false if no valid readings
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bool AP_Proximity_Backend::get_closest_object(float& angle_deg, float &distance) const
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{
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bool sector_found = false;
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uint8_t sector = 0;
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// check all sectors for shorter distance
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for (uint8_t i=0; i<PROXIMITY_NUM_SECTORS; i++) {
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if (_distance_valid[i]) {
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if (!sector_found || (_distance[i] < _distance[sector])) {
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sector = i;
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sector_found = true;
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}
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}
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}
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if (sector_found) {
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angle_deg = _angle[sector];
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distance = _distance[sector];
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}
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return sector_found;
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}
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// get number of objects, used for non-GPS avoidance
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uint8_t AP_Proximity_Backend::get_object_count() const
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{
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return PROXIMITY_NUM_SECTORS;
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}
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// get an object's angle and distance, used for non-GPS avoidance
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// returns false if no angle or distance could be returned for some reason
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bool AP_Proximity_Backend::get_object_angle_and_distance(uint8_t object_number, float& angle_deg, float &distance) const
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{
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if (object_number < PROXIMITY_NUM_SECTORS && _distance_valid[object_number]) {
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angle_deg = _angle[object_number];
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distance = _distance[object_number];
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return true;
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}
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return false;
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}
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// get distances in PROXIMITY_MAX_DIRECTION directions. used for sending distances to ground station
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bool AP_Proximity_Backend::get_horizontal_distances(AP_Proximity::Proximity_Distance_Array &prx_dist_array) const
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{
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// cycle through all sectors filling in distances and orientations
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// see MAV_SENSOR_ORIENTATION for orientations (0 = forward, 1 = 45 degree clockwise from north, etc)
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bool valid_distances = false;
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for (uint8_t i=0; i<PROXIMITY_MAX_DIRECTION; i++) {
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prx_dist_array.orientation[i] = i;
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if (_distance_valid[i]) {
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valid_distances = true;
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prx_dist_array.distance[i] = _distance[i];
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} else {
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prx_dist_array.distance[i] = distance_max();
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}
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}
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return valid_distances;
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}
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// get boundary points around vehicle for use by avoidance
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// returns nullptr and sets num_points to zero if no boundary can be returned
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const Vector2f* AP_Proximity_Backend::get_boundary_points(uint16_t& num_points) const
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{
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// high-level status check
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if (state.status != AP_Proximity::Status::Good) {
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num_points = 0;
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return nullptr;
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}
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// check at least one sector has valid data, if not, exit
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bool some_valid = false;
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for (uint8_t i=0; i<PROXIMITY_NUM_SECTORS; i++) {
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if (_distance_valid[i]) {
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some_valid = true;
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break;
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}
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}
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if (!some_valid) {
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num_points = 0;
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return nullptr;
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}
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// return boundary points
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num_points = PROXIMITY_NUM_SECTORS;
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return _boundary_point;
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}
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// initialise the boundary and sector_edge_vector array used for object avoidance
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// should be called if the sector_middle_deg or _setor_width_deg arrays are changed
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void AP_Proximity_Backend::init_boundary()
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{
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for (uint8_t sector=0; sector < PROXIMITY_NUM_SECTORS; sector++) {
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float angle_rad = radians((float)_sector_middle_deg[sector]+(PROXIMITY_SECTOR_WIDTH_DEG/2.0f));
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_sector_edge_vector[sector].x = cosf(angle_rad) * 100.0f;
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_sector_edge_vector[sector].y = sinf(angle_rad) * 100.0f;
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_boundary_point[sector] = _sector_edge_vector[sector] * PROXIMITY_BOUNDARY_DIST_DEFAULT;
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}
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}
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// update boundary points used for object avoidance based on a single sector's distance changing
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// the boundary points lie on the line between sectors meaning two boundary points may be updated based on a single sector's distance changing
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// the boundary point is set to the shortest distance found in the two adjacent sectors, this is a conservative boundary around the vehicle
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void AP_Proximity_Backend::update_boundary_for_sector(const uint8_t sector, const bool push_to_OA_DB)
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{
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// sanity check
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if (sector >= PROXIMITY_NUM_SECTORS) {
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return;
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}
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if (push_to_OA_DB && _distance_valid[sector]) {
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database_push(_angle[sector], _distance[sector]);
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}
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// find adjacent sector (clockwise)
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uint8_t next_sector = sector + 1;
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if (next_sector >= PROXIMITY_NUM_SECTORS) {
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next_sector = 0;
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}
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// boundary point lies on the line between the two sectors at the shorter distance found in the two sectors
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float shortest_distance = PROXIMITY_BOUNDARY_DIST_DEFAULT;
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if (_distance_valid[sector] && _distance_valid[next_sector]) {
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shortest_distance = MIN(_distance[sector], _distance[next_sector]);
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} else if (_distance_valid[sector]) {
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shortest_distance = _distance[sector];
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} else if (_distance_valid[next_sector]) {
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shortest_distance = _distance[next_sector];
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}
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if (shortest_distance < PROXIMITY_BOUNDARY_DIST_MIN) {
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shortest_distance = PROXIMITY_BOUNDARY_DIST_MIN;
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}
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_boundary_point[sector] = _sector_edge_vector[sector] * shortest_distance;
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// if the next sector (clockwise) has an invalid distance, set boundary to create a cup like boundary
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if (!_distance_valid[next_sector]) {
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_boundary_point[next_sector] = _sector_edge_vector[next_sector] * shortest_distance;
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}
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// repeat for edge between sector and previous sector
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uint8_t prev_sector = (sector == 0) ? PROXIMITY_NUM_SECTORS-1 : sector-1;
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shortest_distance = PROXIMITY_BOUNDARY_DIST_DEFAULT;
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if (_distance_valid[prev_sector] && _distance_valid[sector]) {
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shortest_distance = MIN(_distance[prev_sector], _distance[sector]);
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} else if (_distance_valid[prev_sector]) {
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shortest_distance = _distance[prev_sector];
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} else if (_distance_valid[sector]) {
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shortest_distance = _distance[sector];
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}
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_boundary_point[prev_sector] = _sector_edge_vector[prev_sector] * shortest_distance;
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// if the sector counter-clockwise from the previous sector has an invalid distance, set boundary to create a cup like boundary
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uint8_t prev_sector_ccw = (prev_sector == 0) ? PROXIMITY_NUM_SECTORS - 1 : prev_sector - 1;
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if (!_distance_valid[prev_sector_ccw]) {
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_boundary_point[prev_sector_ccw] = _sector_edge_vector[prev_sector_ccw] * shortest_distance;
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}
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}
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// set status and update valid count
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void AP_Proximity_Backend::set_status(AP_Proximity::Status status)
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{
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state.status = status;
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}
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// correct an angle (in degrees) based on the orientation and yaw correction parameters
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float AP_Proximity_Backend::correct_angle_for_orientation(float angle_degrees) const
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{
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const float angle_sign = (frontend.get_orientation(state.instance) == 1) ? -1.0f : 1.0f;
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return wrap_360(angle_degrees * angle_sign + frontend.get_yaw_correction(state.instance));
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}
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// find which sector a given angle falls into
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uint8_t AP_Proximity_Backend::convert_angle_to_sector(float angle_degrees) const
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{
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return wrap_360(angle_degrees + (PROXIMITY_SECTOR_WIDTH_DEG * 0.5f)) / 45.0f;
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}
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// check if a reading should be ignored because it falls into an ignore area
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bool AP_Proximity_Backend::ignore_reading(uint16_t angle_deg) const
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{
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// check angle vs each ignore area
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for (uint8_t i=0; i < PROXIMITY_MAX_IGNORE; i++) {
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if (frontend._ignore_width_deg[i] != 0) {
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if (abs(angle_deg - frontend._ignore_angle_deg[i]) <= (frontend._ignore_width_deg[i]/2)) {
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return true;
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}
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}
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}
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return false;
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}
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// returns true if database is ready to be pushed to and all cached data is ready
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bool AP_Proximity_Backend::database_prepare_for_push(Vector3f ¤t_pos, Matrix3f &body_to_ned)
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{
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AP_OADatabase *oaDb = AP::oadatabase();
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if (oaDb == nullptr || !oaDb->healthy()) {
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return false;
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}
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if (!AP::ahrs().get_relative_position_NED_origin(current_pos)) {
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return false;
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}
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body_to_ned = AP::ahrs().get_rotation_body_to_ned();
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return true;
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}
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// update Object Avoidance database with Earth-frame point
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void AP_Proximity_Backend::database_push(float angle, float distance)
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{
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Vector3f current_pos;
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Matrix3f body_to_ned;
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if (database_prepare_for_push(current_pos, body_to_ned)) {
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database_push(angle, distance, AP_HAL::millis(), current_pos, body_to_ned);
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}
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}
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// update Object Avoidance database with Earth-frame point
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void AP_Proximity_Backend::database_push(float angle, float distance, uint32_t timestamp_ms, const Vector3f ¤t_pos, const Matrix3f &body_to_ned)
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{
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AP_OADatabase *oaDb = AP::oadatabase();
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if (oaDb == nullptr || !oaDb->healthy()) {
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return;
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}
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//Assume object is angle bearing and distance meters away from the vehicle
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Vector2f object_2D = {0.0f,0.0f};
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object_2D.offset_bearing(wrap_180(angle), distance);
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//rotate that vector to a 3D vector in NED frame
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const Vector3f object_3D = {object_2D.x,object_2D.y,0.0f};
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const Vector3f rotated_object_3D = body_to_ned * object_3D;
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//Calculate the position vector from origin
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Vector3f temp_pos = current_pos + rotated_object_3D;
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//Convert the vector to a NEU frame from NED
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temp_pos.z = temp_pos.z * -1.0f;
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oaDb->queue_push(temp_pos, timestamp_ms, distance);
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} |