ardupilot/libraries/AP_Soaring/AP_Soaring.h

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/*
Soaring Controller class by Samuel Tabor
Provides a layer between the thermal centring algorithm and the main
code for managing navigation targets, data logging, tuning parameters,
algorithm inputs and eventually other soaring strategies such as
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speed-to-fly. AP_TECS library used for reference.
*/
#pragma once
#include <AP_AHRS/AP_AHRS.h>
#include <AP_Param/AP_Param.h>
#include <AP_Math/AP_Math.h>
#include "ExtendedKalmanFilter.h"
#include "Variometer.h"
#include <AP_SpdHgtControl/AP_SpdHgtControl.h>
#ifndef HAL_SOARING_ENABLED
#define HAL_SOARING_ENABLED !HAL_MINIMIZE_FEATURES
#endif
#if HAL_SOARING_ENABLED
#define INITIAL_THERMAL_STRENGTH 2.0
#define INITIAL_THERMAL_RADIUS 80.0
#define INITIAL_STRENGTH_COVARIANCE 0.0049
#define INITIAL_RADIUS_COVARIANCE 400.0
#define INITIAL_POSITION_COVARIANCE 400.0
class SoaringController {
ExtendedKalmanFilter _ekf{};
AP_SpdHgtControl &_spdHgt;
Variometer _vario;
const AP_Vehicle::FixedWing &_aparm;
// store aircraft location at last update
Vector3f _prev_update_location;
// store time thermal was entered for hysteresis
uint64_t _thermal_start_time_us;
// store position thermal was entered as a backup check
Vector3f _thermal_start_pos;
// store time cruise was entered for hysteresis
uint64_t _cruise_start_time_us;
// store time of last update
uint64_t _prev_update_time;
bool _throttle_suppressed;
float McCready(float alt);
float _thermalability;
LowPassFilter<float> _position_x_filter{1/60.0};
LowPassFilter<float> _position_y_filter{1/60.0};
protected:
AP_Int8 soar_active;
AP_Float thermal_vspeed;
AP_Float thermal_q1;
AP_Float thermal_q2;
AP_Float thermal_r;
AP_Float thermal_distance_ahead;
AP_Int16 min_thermal_s;
AP_Int16 min_cruise_s;
AP_Float polar_CD0;
AP_Float polar_B;
AP_Float polar_K;
AP_Float alt_max;
AP_Float alt_min;
AP_Float alt_cutoff;
AP_Float max_drift;
AP_Float thermal_bank;
public:
SoaringController(AP_SpdHgtControl &spdHgt, const AP_Vehicle::FixedWing &parms);
enum class LoiterStatus {
DISABLED,
ALT_TOO_HIGH,
ALT_TOO_LOW,
THERMAL_WEAK,
ALT_LOST,
DRIFT_EXCEEDED,
GOOD_TO_KEEP_LOITERING,
EXIT_COMMANDED,
};
enum class ActiveStatus {
SOARING_DISABLED,
MANUAL_MODE_CHANGE,
AUTO_MODE_CHANGE
};
AP_Float max_radius;
// this supports the TECS_* user settable parameters
static const struct AP_Param::GroupInfo var_info[];
void get_target(Location & wp);
bool suppress_throttle();
bool check_thermal_criteria();
LoiterStatus check_cruise_criteria(Vector2f prev_wp, Vector2f next_wp);
void init_thermalling();
void init_cruising();
void update_thermalling();
void update_cruising();
void set_throttle_suppressed(bool suppressed);
bool get_throttle_suppressed() const
{
return _throttle_suppressed;
}
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float get_vario_reading() const
{
return _vario.displayed_reading;
}
void update_vario();
bool check_drift(Vector2f prev_wp, Vector2f next_wp);
void update_active_state();
bool is_active() const {return _last_update_status>=SoaringController::ActiveStatus::MANUAL_MODE_CHANGE;};
void set_pilot_desired_state(ActiveStatus pilot_desired_state) {_pilot_desired_state = pilot_desired_state;};
float get_alt_cutoff() const {return alt_cutoff;}
float get_circling_time() const {return _vario.tau;}
float get_thermalling_radius() const;
private:
// slow down messages if they are the same. During loiter we could smap the same message. Only show new messages during loiters
LoiterStatus _cruise_criteria_msg_last;
ActiveStatus _last_update_status;
ActiveStatus _pilot_desired_state = ActiveStatus::AUTO_MODE_CHANGE;
ActiveStatus active_state() const;
bool _exit_commanded;
};
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#endif // HAL_SOARING_ENABLED