ardupilot/libraries/AP_Beacon/AP_Beacon_SITL.cpp

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/*
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 3 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/>.
*/
#include <AP_HAL/AP_HAL.h>
#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
#include "AP_Beacon_SITL.h"
#include <stdio.h>
extern const AP_HAL::HAL& hal;
#define NUM_BEACONS 4
/*
* Define a rectangular pattern of beacons with the pattern centroid located at the beacon origin as defined by the following params:
*
* BCN_ALT - Height above the WGS-84 geoid (m)
* BCN_LATITUDE - WGS-84 latitude (deg)
* BCN_LONGITUDE - WGS-84 longitude (deg)
*
* The spacing between beacons in the North/South and East/West directions is defined by the following parameters:
*/
#define BEACON_SPACING_NORTH 10.0
#define BEACON_SPACING_EAST 20.0
// The centroid of the pattern can be moved using using the following parameters:
#define ORIGIN_OFFSET_NORTH 2.5 // shifts beacon pattern centroid North (m)
#define ORIGIN_OFFSET_EAST 5.0 // shifts beacon pattern centroid East (m)
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// constructor
AP_Beacon_SITL::AP_Beacon_SITL(AP_Beacon &frontend) :
AP_Beacon_Backend(frontend)
{
sitl = (SITL::SITL *)AP_Param::find_object("SIM_");
}
// return true if sensor is basically healthy (we are receiving data)
bool AP_Beacon_SITL::healthy()
{
// healthy if we have parsed a message within the past 300ms
return ((AP_HAL::millis() - last_update_ms) < AP_BEACON_TIMEOUT_MS);
}
// update the state of the sensor
void AP_Beacon_SITL::update(void)
{
uint32_t now = AP_HAL::millis();
if (now - last_update_ms < 10) {
return;
}
uint8_t beacon_id = next_beacon;
next_beacon = (next_beacon+1) % NUM_BEACONS;
// truth location of the flight vehicle
Location current_loc;
current_loc.lat = sitl->state.latitude * 1.0e7;
current_loc.lng = sitl->state.longitude * 1.0e7;
current_loc.alt = sitl->state.altitude * 1.0e2;
// where the beacon system origin is located
Location beacon_origin;
beacon_origin.lat = get_beacon_origin_lat() * 1.0e7;
beacon_origin.lng = get_beacon_origin_lon() * 1.0e7;
beacon_origin.alt = get_beacon_origin_alt() * 1.0e2;
// position of each beacon
Location beacon_loc = beacon_origin;
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switch (beacon_id) {
case 0:
// NE corner
location_offset(beacon_loc, ORIGIN_OFFSET_NORTH + BEACON_SPACING_NORTH/2, ORIGIN_OFFSET_EAST + BEACON_SPACING_EAST/2);
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break;
case 1:
// SE corner
location_offset(beacon_loc, ORIGIN_OFFSET_NORTH - BEACON_SPACING_NORTH/2, ORIGIN_OFFSET_EAST + BEACON_SPACING_EAST);
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break;
case 2:
// SW corner
location_offset(beacon_loc, ORIGIN_OFFSET_NORTH - BEACON_SPACING_NORTH/2, ORIGIN_OFFSET_EAST - BEACON_SPACING_EAST/2);
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break;
case 3:
// NW corner
location_offset(beacon_loc, ORIGIN_OFFSET_NORTH + BEACON_SPACING_NORTH/2, ORIGIN_OFFSET_EAST - BEACON_SPACING_EAST/2);
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break;
}
Vector2f beac_diff = location_diff(beacon_origin, beacon_loc);
Vector2f veh_diff = location_diff(beacon_origin, current_loc);
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Vector3f veh_pos3d(veh_diff.x, veh_diff.y, (current_loc.alt - beacon_origin.alt)*1.0e-2);
Vector3f beac_pos3d(beac_diff.x, beac_diff.y, (beacon_origin.alt - beacon_loc.alt)*1.0e-2);
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Vector3f beac_veh_offset = veh_pos3d - beac_pos3d;
set_beacon_position(beacon_id, beac_pos3d);
set_beacon_distance(beacon_id, beac_veh_offset.length());
set_vehicle_position(veh_pos3d, 0.5f);
last_update_ms = now;
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}
#endif // CONFIG_HAL_BOARD