ardupilot/libraries/AP_Soaring/Variometer.h

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/* Variometer class by Samuel Tabor
Manages the estimation of aircraft total energy, drag and vertical air velocity.
*/
#pragma once
#include <AP_AHRS/AP_AHRS.h>
#include <AP_Param/AP_Param.h>
#include <DataFlash/DataFlash.h>
#include <AP_SpdHgtControl/AP_SpdHgtControl.h>
#define ASPD_FILT 0.05
#define TE_FILT 0.03
#define TE_FILT_DISPLAYED 0.15
class Variometer {
AP_AHRS &_ahrs;
AP_SpdHgtControl &_spdHgt;
const AP_Vehicle::FixedWing &_aparm;
// store time of last update
unsigned long _prev_update_time;
float _last_alt;
float _aspd_filt;
float _last_aspd;
float _last_roll;
float _last_total_E;
public:
Variometer(AP_AHRS &ahrs, AP_SpdHgtControl &spdHgt, const AP_Vehicle::FixedWing &parms);
float alt;
float reading;
float filtered_reading;
float displayed_reading;
bool new_data;
void update(const float polar_K, const float polar_CD0, const float polar_B);
float correct_netto_rate(float climb_rate, float phi, float aspd, const float polar_K, const float polar_CD0, const float polar_B);
};