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Merge pull request #1222 from PX4/asfilter

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Airspeed filtering, reinstate TECS for testing
This commit is contained in:
Lorenz Meier 2014-07-31 10:25:02 +02:00
commit 3a32ffa90b
13 changed files with 339 additions and 46 deletions
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4
ROMFS/px4fmu_common/init.d/rc.fw_defaults
View File

@ -11,4 +11,8 @@ then
param set NAV_RTL_ALT 100
param set NAV_RTL_LAND_T -1
param set NAV_ACCEPT_RAD 50
param set FW_T_HRATE_P 0.01
param set FW_T_RLL2THR 15
param set FW_T_SRATE_P 0.01
param set FW_T_TIME_CONST 5
fi

1
makefiles/config_aerocore_default.mk
View File

@ -80,6 +80,7 @@ LIBRARIES += lib/mathlib/CMSIS
MODULES += lib/mathlib
MODULES += lib/mathlib/math/filter
MODULES += lib/ecl
MODULES += lib/external_lgpl
MODULES += lib/geo
MODULES += lib/geo_lookup
MODULES += lib/conversion

1
makefiles/config_px4fmu-v1_default.mk
View File

@ -108,6 +108,7 @@ LIBRARIES += lib/mathlib/CMSIS
MODULES += lib/mathlib
MODULES += lib/mathlib/math/filter
MODULES += lib/ecl
MODULES += lib/external_lgpl
MODULES += lib/geo
MODULES += lib/geo_lookup
MODULES += lib/conversion

1
makefiles/config_px4fmu-v2_default.mk
View File

@ -121,6 +121,7 @@ LIBRARIES += lib/mathlib/CMSIS
MODULES += lib/mathlib
MODULES += lib/mathlib/math/filter
MODULES += lib/ecl
MODULES += lib/external_lgpl
MODULES += lib/geo
MODULES += lib/geo_lookup
MODULES += lib/conversion

8
src/drivers/meas_airspeed/meas_airspeed.cpp
View File

@ -92,7 +92,7 @@
#include <drivers/airspeed/airspeed.h>
/* I2C bus address is 1010001x */
#define I2C_ADDRESS_MS4525DO 0x28 //0x51 /* 7-bit address. */
#define I2C_ADDRESS_MS4525DO 0x28 /**< 7-bit address. Depends on the order code (this is for code "I") */
#define PATH_MS4525 "/dev/ms4525"
/* The MS5525DSO address is 111011Cx, where C is the complementary value of the pin CSB */
#define I2C_ADDRESS_MS5525DSO 0x77 //0x77/* 7-bit address, addr. pin pulled low */
@ -102,9 +102,9 @@
#define ADDR_READ_MR 0x00 /* write to this address to start conversion */
/* Measurement rate is 100Hz */
#define MEAS_RATE 100.0f
#define MEAS_DRIVER_FILTER_FREQ 3.0f
#define CONVERSION_INTERVAL (1000000 / 100) /* microseconds */
#define MEAS_RATE 100
#define MEAS_DRIVER_FILTER_FREQ 1.5f
#define CONVERSION_INTERVAL (1000000 / MEAS_RATE) /* microseconds */
class MEASAirspeed : public Airspeed
{

2
src/lib/ecl/module.mk
View File

@ -39,3 +39,5 @@ SRCS = attitude_fw/ecl_pitch_controller.cpp \
attitude_fw/ecl_roll_controller.cpp \
attitude_fw/ecl_yaw_controller.cpp \
l1/ecl_l1_pos_controller.cpp
MAXOPTIMIZATION = -Os

2
src/lib/external_lgpl/module.mk
View File

@ -46,3 +46,5 @@
#
SRCS = tecs/tecs.cpp
MAXOPTIMIZATION = -Os

3
src/modules/controllib/blocks.cpp
View File

@ -121,6 +121,9 @@ int blockLimitSymTest()
float BlockLowPass::update(float input)
{
if (!isfinite(getState())) {
setState(input);
}
float b = 2 * float(M_PI) * getFCut() * getDt();
float a = b / (1 + b);
setState(a * input + (1 - a)*getState());

2
src/modules/controllib/blocks.hpp
View File

@ -114,7 +114,7 @@ public:
// methods
BlockLowPass(SuperBlock *parent, const char *name) :
Block(parent, name),
_state(0),
_state(0.0f/0.0f /* initialize to invalid val, force into is_finite() check on first call */),
_fCut(this, "") // only one parameter, no need to name
{};
virtual ~BlockLowPass() {};

166
src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp
View File

@ -42,8 +42,8 @@
* Proceedings of the AIAA Guidance, Navigation and Control
* Conference, Aug 2004. AIAA-2004-4900.
*
* Implementation for total energy control class:
* Thomas Gubler
* Original implementation for total energy control class:
* Paul Riseborough and Andrew Tridgell, 2013 (code in lib/external_lgpl)
*
* More details and acknowledgements in the referenced library headers.
*
@ -87,10 +87,13 @@
#include <mavlink/mavlink_log.h>
#include <launchdetection/LaunchDetector.h>
#include <ecl/l1/ecl_l1_pos_controller.h>
#include <external_lgpl/tecs/tecs.h>
#include <drivers/drv_range_finder.h>
#include "landingslope.h"
#include "mtecs/mTecs.h"
static int _control_task = -1; /**< task handle for sensor task */
/**
* L1 control app start / stop handling function
@ -115,9 +118,9 @@ public:
/**
* Start the sensors task.
*
* @return OK on success.
* @return OK on success.
*/
int start();
static int start();
/**
* Task status
@ -131,7 +134,6 @@ private:
bool _task_should_exit; /**< if true, sensor task should exit */
bool _task_running; /**< if true, task is running in its mainloop */
int _control_task; /**< task handle for sensor task */
int _global_pos_sub;
int _pos_sp_triplet_sub;
@ -192,6 +194,7 @@ private:
math::Matrix<3, 3> _R_nb; ///< current attitude
ECL_L1_Pos_Controller _l1_control;
TECS _tecs;
fwPosctrl::mTecs _mTecs;
bool _was_pos_control_mode;
@ -199,6 +202,21 @@ private:
float l1_period;
float l1_damping;
float time_const;
float min_sink_rate;
float max_sink_rate;
float max_climb_rate;
float heightrate_p;
float speedrate_p;
float throttle_damp;
float integrator_gain;
float vertical_accel_limit;
float height_comp_filter_omega;
float speed_comp_filter_omega;
float roll_throttle_compensation;
float speed_weight;
float pitch_damping;
float airspeed_min;
float airspeed_trim;
float airspeed_max;
@ -226,6 +244,21 @@ private:
param_t l1_period;
param_t l1_damping;
param_t time_const;
param_t min_sink_rate;
param_t max_sink_rate;
param_t max_climb_rate;
param_t heightrate_p;
param_t speedrate_p;
param_t throttle_damp;
param_t integrator_gain;
param_t vertical_accel_limit;
param_t height_comp_filter_omega;
param_t speed_comp_filter_omega;
param_t roll_throttle_compensation;
param_t speed_weight;
param_t pitch_damping;
param_t airspeed_min;
param_t airspeed_trim;
param_t airspeed_max;
@ -361,7 +394,6 @@ FixedwingPositionControl::FixedwingPositionControl() :
_mavlink_fd(-1),
_task_should_exit(false),
_task_running(false),
_control_task(-1),
/* subscriptions */
_global_pos_sub(-1),
@ -438,6 +470,21 @@ FixedwingPositionControl::FixedwingPositionControl() :
_parameter_handles.land_heading_hold_horizontal_distance = param_find("FW_LND_HHDIST");
_parameter_handles.range_finder_rel_alt = param_find("FW_LND_RFRALT");
_parameter_handles.time_const = param_find("FW_T_TIME_CONST");
_parameter_handles.min_sink_rate = param_find("FW_T_SINK_MIN");
_parameter_handles.max_sink_rate = param_find("FW_T_SINK_MAX");
_parameter_handles.max_climb_rate = param_find("FW_T_CLMB_MAX");
_parameter_handles.throttle_damp = param_find("FW_T_THR_DAMP");
_parameter_handles.integrator_gain = param_find("FW_T_INTEG_GAIN");
_parameter_handles.vertical_accel_limit = param_find("FW_T_VERT_ACC");
_parameter_handles.height_comp_filter_omega = param_find("FW_T_HGT_OMEGA");
_parameter_handles.speed_comp_filter_omega = param_find("FW_T_SPD_OMEGA");
_parameter_handles.roll_throttle_compensation = param_find("FW_T_RLL2THR");
_parameter_handles.speed_weight = param_find("FW_T_SPDWEIGHT");
_parameter_handles.pitch_damping = param_find("FW_T_PTCH_DAMP");
_parameter_handles.heightrate_p = param_find("FW_T_HRATE_P");
_parameter_handles.speedrate_p = param_find("FW_T_SRATE_P");
/* fetch initial parameter values */
parameters_update();
}
@ -488,6 +535,22 @@ FixedwingPositionControl::parameters_update()
param_get(_parameter_handles.throttle_land_max, &(_parameters.throttle_land_max));
param_get(_parameter_handles.time_const, &(_parameters.time_const));
param_get(_parameter_handles.min_sink_rate, &(_parameters.min_sink_rate));
param_get(_parameter_handles.max_sink_rate, &(_parameters.max_sink_rate));
param_get(_parameter_handles.throttle_damp, &(_parameters.throttle_damp));
param_get(_parameter_handles.integrator_gain, &(_parameters.integrator_gain));
param_get(_parameter_handles.vertical_accel_limit, &(_parameters.vertical_accel_limit));
param_get(_parameter_handles.height_comp_filter_omega, &(_parameters.height_comp_filter_omega));
param_get(_parameter_handles.speed_comp_filter_omega, &(_parameters.speed_comp_filter_omega));
param_get(_parameter_handles.roll_throttle_compensation, &(_parameters.roll_throttle_compensation));
param_get(_parameter_handles.speed_weight, &(_parameters.speed_weight));
param_get(_parameter_handles.pitch_damping, &(_parameters.pitch_damping));
param_get(_parameter_handles.max_climb_rate, &(_parameters.max_climb_rate));
param_get(_parameter_handles.heightrate_p, &(_parameters.heightrate_p));
param_get(_parameter_handles.speedrate_p, &(_parameters.speedrate_p));
param_get(_parameter_handles.land_slope_angle, &(_parameters.land_slope_angle));
param_get(_parameter_handles.land_H1_virt, &(_parameters.land_H1_virt));
param_get(_parameter_handles.land_flare_alt_relative, &(_parameters.land_flare_alt_relative));
@ -500,6 +563,23 @@ FixedwingPositionControl::parameters_update()
_l1_control.set_l1_period(_parameters.l1_period);
_l1_control.set_l1_roll_limit(math::radians(_parameters.roll_limit));
_tecs.set_time_const(_parameters.time_const);
_tecs.set_min_sink_rate(_parameters.min_sink_rate);
_tecs.set_max_sink_rate(_parameters.max_sink_rate);
_tecs.set_throttle_damp(_parameters.throttle_damp);
_tecs.set_integrator_gain(_parameters.integrator_gain);
_tecs.set_vertical_accel_limit(_parameters.vertical_accel_limit);
_tecs.set_height_comp_filter_omega(_parameters.height_comp_filter_omega);
_tecs.set_speed_comp_filter_omega(_parameters.speed_comp_filter_omega);
_tecs.set_roll_throttle_compensation(_parameters.roll_throttle_compensation);
_tecs.set_speed_weight(_parameters.speed_weight);
_tecs.set_pitch_damping(_parameters.pitch_damping);
_tecs.set_indicated_airspeed_min(_parameters.airspeed_min);
_tecs.set_indicated_airspeed_max(_parameters.airspeed_max);
_tecs.set_max_climb_rate(_parameters.max_climb_rate);
_tecs.set_heightrate_p(_parameters.heightrate_p);
_tecs.set_speedrate_p(_parameters.speedrate_p);
/* sanity check parameters */
if (_parameters.airspeed_max < _parameters.airspeed_min ||
_parameters.airspeed_max < 5.0f ||
@ -561,6 +641,9 @@ FixedwingPositionControl::vehicle_airspeed_poll()
}
}
/* update TECS state */
_tecs.enable_airspeed(_airspeed_valid);
return airspeed_updated;
}
@ -621,7 +704,17 @@ FixedwingPositionControl::vehicle_setpoint_poll()
void
FixedwingPositionControl::task_main_trampoline(int argc, char *argv[])
{
l1_control::g_control = new FixedwingPositionControl();
if (l1_control::g_control == nullptr) {
warnx("OUT OF MEM");
return;
}
/* only returns on exit */
l1_control::g_control->task_main();
delete l1_control::g_control;
l1_control::g_control = nullptr;
}
float
@ -733,6 +826,14 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
float eas2tas = 1.0f; // XXX calculate actual number based on current measurements
/* filter speed and altitude for controller */
math::Vector<3> accel_body(_sensor_combined.accelerometer_m_s2);
math::Vector<3> accel_earth = _R_nb * accel_body;
if (!_mTecs.getEnabled()) {
_tecs.update_50hz(_global_pos.alt /* XXX might switch to alt err here */, _airspeed.indicated_airspeed_m_s, _R_nb, accel_body, accel_earth);
}
/* define altitude error */
float altitude_error = _pos_sp_triplet.current.alt - _global_pos.alt;
@ -758,6 +859,9 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
/* get circle mode */
bool was_circle_mode = _l1_control.circle_mode();
/* restore speed weight, in case changed intermittently (e.g. in landing handling) */
_tecs.set_speed_weight(_parameters.speed_weight);
/* current waypoint (the one currently heading for) */
math::Vector<2> next_wp((float)pos_sp_triplet.current.lat, (float)pos_sp_triplet.current.lon);
@ -1066,9 +1170,9 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
_att_sp.thrust = launchDetector.getThrottlePreTakeoff();
}
else {
_att_sp.thrust = math::min(_mTecs.getThrottleSetpoint(), throttle_max);
_att_sp.thrust = math::min(_mTecs.getEnabled() ? _mTecs.getThrottleSetpoint() : _tecs.get_throttle_demand(), throttle_max);
}
_att_sp.pitch_body = _mTecs.getPitchSetpoint();
_att_sp.pitch_body = _mTecs.getEnabled() ? _mTecs.getPitchSetpoint() : _tecs.get_pitch_demand();
if (_control_mode.flag_control_position_enabled) {
last_manual = false;
@ -1084,10 +1188,6 @@ void
FixedwingPositionControl::task_main()
{
/* inform about start */
warnx("Initializing..");
fflush(stdout);
/*
* do subscriptions
*/
@ -1248,20 +1348,29 @@ void FixedwingPositionControl::tecs_update_pitch_throttle(float alt_sp, float v_
const math::Vector<3> &ground_speed,
tecs_mode mode)
{
/* Using mtecs library: prepare arguments for mtecs call */
float flightPathAngle = 0.0f;
float ground_speed_length = ground_speed.length();
if (ground_speed_length > FLT_EPSILON) {
flightPathAngle = -asinf(ground_speed(2)/ground_speed_length);
}
fwPosctrl::LimitOverride limitOverride;
if (climbout_mode) {
limitOverride.enablePitchMinOverride(M_RAD_TO_DEG_F * climbout_pitch_min_rad);
if (_mTecs.getEnabled()) {
/* Using mtecs library: prepare arguments for mtecs call */
float flightPathAngle = 0.0f;
float ground_speed_length = ground_speed.length();
if (ground_speed_length > FLT_EPSILON) {
flightPathAngle = -asinf(ground_speed(2)/ground_speed_length);
}
fwPosctrl::LimitOverride limitOverride;
if (climbout_mode) {
limitOverride.enablePitchMinOverride(M_RAD_TO_DEG_F * climbout_pitch_min_rad);
} else {
limitOverride.disablePitchMinOverride();
}
_mTecs.updateAltitudeSpeed(flightPathAngle, altitude, alt_sp, _airspeed.true_airspeed_m_s, v_sp, mode,
limitOverride);
} else {
limitOverride.disablePitchMinOverride();
/* Using tecs library */
_tecs.update_pitch_throttle(_R_nb, _att.pitch, altitude, alt_sp, v_sp,
_airspeed.indicated_airspeed_m_s, eas2tas,
climbout_mode, climbout_pitch_min_rad,
throttle_min, throttle_max, throttle_cruise,
pitch_min_rad, pitch_max_rad);
}
_mTecs.updateAltitudeSpeed(flightPathAngle, altitude, alt_sp, _airspeed.true_airspeed_m_s, v_sp, mode,
limitOverride);
}
int
@ -1295,14 +1404,7 @@ int fw_pos_control_l1_main(int argc, char *argv[])
if (l1_control::g_control != nullptr)
errx(1, "already running");
l1_control::g_control = new FixedwingPositionControl;
if (l1_control::g_control == nullptr)
errx(1, "alloc failed");
if (OK != l1_control::g_control->start()) {
delete l1_control::g_control;
l1_control::g_control = nullptr;
if (OK != FixedwingPositionControl::start()) {
err(1, "start failed");
}

176
src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c
View File

@ -154,6 +154,182 @@ PARAM_DEFINE_FLOAT(FW_THR_MIN, 0.0f);
*/
PARAM_DEFINE_FLOAT(FW_THR_LND_MAX, 1.0f);
/**
* Maximum climb rate
*
* This is the best climb rate that the aircraft can achieve with
* the throttle set to THR_MAX and the airspeed set to the
* default value. For electric aircraft make sure this number can be
* achieved towards the end of flight when the battery voltage has reduced.
* The setting of this parameter can be checked by commanding a positive
* altitude change of 100m in loiter, RTL or guided mode. If the throttle
* required to climb is close to THR_MAX and the aircraft is maintaining
* airspeed, then this parameter is set correctly. If the airspeed starts
* to reduce, then the parameter is set to high, and if the throttle
* demand required to climb and maintain speed is noticeably less than
* FW_THR_MAX, then either FW_T_CLMB_MAX should be increased or
* FW_THR_MAX reduced.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_CLMB_MAX, 5.0f);
/**
* Minimum descent rate
*
* This is the sink rate of the aircraft with the throttle
* set to THR_MIN and flown at the same airspeed as used
* to measure FW_T_CLMB_MAX.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_SINK_MIN, 2.0f);
/**
* Maximum descent rate
*
* This sets the maximum descent rate that the controller will use.
* If this value is too large, the aircraft can over-speed on descent.
* This should be set to a value that can be achieved without
* exceeding the lower pitch angle limit and without over-speeding
* the aircraft.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_SINK_MAX, 5.0f);
/**
* TECS time constant
*
* This is the time constant of the TECS control algorithm (in seconds).
* Smaller values make it faster to respond, larger values make it slower
* to respond.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_TIME_CONST, 5.0f);
/**
* Throttle damping factor
*
* This is the damping gain for the throttle demand loop.
* Increase to add damping to correct for oscillations in speed and height.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_THR_DAMP, 0.5f);
/**
* Integrator gain
*
* This is the integrator gain on the control loop.
* Increasing this gain increases the speed at which speed
* and height offsets are trimmed out, but reduces damping and
* increases overshoot.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_INTEG_GAIN, 0.1f);
/**
* Maximum vertical acceleration
*
* This is the maximum vertical acceleration (in metres/second square)
* either up or down that the controller will use to correct speed
* or height errors. The default value of 7 m/s/s (equivalent to +- 0.7 g)
* allows for reasonably aggressive pitch changes if required to recover
* from under-speed conditions.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_VERT_ACC, 7.0f);
/**
* Complementary filter "omega" parameter for height
*
* This is the cross-over frequency (in radians/second) of the complementary
* filter used to fuse vertical acceleration and barometric height to obtain
* an estimate of height rate and height. Increasing this frequency weights
* the solution more towards use of the barometer, whilst reducing it weights
* the solution more towards use of the accelerometer data.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_HGT_OMEGA, 3.0f);
/**
* Complementary filter "omega" parameter for speed
*
* This is the cross-over frequency (in radians/second) of the complementary
* filter used to fuse longitudinal acceleration and airspeed to obtain an
* improved airspeed estimate. Increasing this frequency weights the solution
* more towards use of the arispeed sensor, whilst reducing it weights the
* solution more towards use of the accelerometer data.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_SPD_OMEGA, 2.0f);
/**
* Roll -> Throttle feedforward
*
* Increasing this gain turn increases the amount of throttle that will
* be used to compensate for the additional drag created by turning.
* Ideally this should be set to approximately 10 x the extra sink rate
* in m/s created by a 45 degree bank turn. Increase this gain if
* the aircraft initially loses energy in turns and reduce if the
* aircraft initially gains energy in turns. Efficient high aspect-ratio
* aircraft (eg powered sailplanes) can use a lower value, whereas
* inefficient low aspect-ratio models (eg delta wings) can use a higher value.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_RLL2THR, 10.0f);
/**
* Speed <--> Altitude priority
*
* This parameter adjusts the amount of weighting that the pitch control
* applies to speed vs height errors. Setting it to 0.0 will cause the
* pitch control to control height and ignore speed errors. This will
* normally improve height accuracy but give larger airspeed errors.
* Setting it to 2.0 will cause the pitch control loop to control speed
* and ignore height errors. This will normally reduce airspeed errors,
* but give larger height errors. The default value of 1.0 allows the pitch
* control to simultaneously control height and speed.
* Note to Glider Pilots - set this parameter to 2.0 (The glider will
* adjust its pitch angle to maintain airspeed, ignoring changes in height).
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_SPDWEIGHT, 1.0f);
/**
* Pitch damping factor
*
* This is the damping gain for the pitch demand loop. Increase to add
* damping to correct for oscillations in height. The default value of 0.0
* will work well provided the pitch to servo controller has been tuned
* properly.
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_PTCH_DAMP, 0.0f);
/**
* Height rate P factor
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_HRATE_P, 0.05f);
/**
* Speed rate P factor
*
* @group L1 Control
*/
PARAM_DEFINE_FLOAT(FW_T_SRATE_P, 0.05f);
/**
* Landing slope angle
*

1
src/modules/fw_pos_control_l1/mtecs/mTecs.cpp
View File

@ -76,6 +76,7 @@ mTecs::mTecs() :
_counter(0),
_debug(false)
{
warnx("starting");
}
mTecs::~mTecs()

18
src/modules/fw_pos_control_l1/mtecs/mTecs_params.c
View File

@ -241,7 +241,14 @@ PARAM_DEFINE_FLOAT(MT_FPA_MAX, 30.0f);
*
* @group mTECS
*/
PARAM_DEFINE_FLOAT(MT_A_LP, 1.0f);
PARAM_DEFINE_FLOAT(MT_A_LP, 0.5f);
/**
* Airspeed derivative calculation lowpass
*
* @group mTECS
*/
PARAM_DEFINE_FLOAT(MT_AD_LP, 0.5f);
/**
* P gain for the airspeed control
@ -268,7 +275,7 @@ PARAM_DEFINE_FLOAT(MT_ACC_D, 0.0f);
*
* @group mTECS
*/
PARAM_DEFINE_FLOAT(MT_ACC_D_LP, 1.0f);
PARAM_DEFINE_FLOAT(MT_ACC_D_LP, 0.5f);
/**
* Minimal acceleration (air)
@ -286,13 +293,6 @@ PARAM_DEFINE_FLOAT(MT_ACC_MIN, -40.0f);
*/
PARAM_DEFINE_FLOAT(MT_ACC_MAX, 40.0f);
/**
* Airspeed derivative calculation lowpass
*
* @group mTECS
*/
PARAM_DEFINE_FLOAT(MT_AD_LP, 1.0f);
/**
* Minimal throttle during takeoff
*