L1 position controller: use double precision floating point for all lat/lon

This commit is contained in:
Daniel Agar
2021-02-11 19:57:31 -05:00
committed by Lorenz Meier
parent 31a6edff07
commit 1981519aad
9 changed files with 102 additions and 95 deletions
+32 -21
View File
@@ -46,6 +46,7 @@
#include <float.h>
using matrix::Vector2d;
using matrix::Vector2f;
using matrix::wrap_pi;
@@ -72,17 +73,15 @@ float ECL_L1_Pos_Controller::switch_distance(float wp_radius)
}
void
ECL_L1_Pos_Controller::navigate_waypoints(const Vector2f &vector_A, const Vector2f &vector_B,
const Vector2f &vector_curr_position, const Vector2f &ground_speed_vector)
ECL_L1_Pos_Controller::navigate_waypoints(const Vector2d &vector_A, const Vector2d &vector_B,
const Vector2d &vector_curr_position, const Vector2f &ground_speed_vector)
{
/* this follows the logic presented in [1] */
float eta = 0.0f;
float xtrack_vel = 0.0f;
float ltrack_vel = 0.0f;
/* get the direction between the last (visited) and next waypoint */
_target_bearing = get_bearing_to_next_waypoint((double)vector_curr_position(0), (double)vector_curr_position(1),
(double)vector_B(0), (double)vector_B(1));
_target_bearing = get_bearing_to_next_waypoint(vector_curr_position(0), vector_curr_position(1), vector_B(0),
vector_B(1));
/* enforce a minimum ground speed of 0.1 m/s to avoid singularities */
float ground_speed = math::max(ground_speed_vector.length(), 0.1f);
@@ -132,11 +131,14 @@ ECL_L1_Pos_Controller::navigate_waypoints(const Vector2f &vector_A, const Vector
/* unit vector from waypoint A to current position */
Vector2f vector_A_to_airplane_unit = vector_A_to_airplane.normalized();
/* velocity across / orthogonal to line */
xtrack_vel = ground_speed_vector % (-vector_A_to_airplane_unit);
float xtrack_vel = ground_speed_vector % (-vector_A_to_airplane_unit);
/* velocity along line */
ltrack_vel = ground_speed_vector * (-vector_A_to_airplane_unit);
float ltrack_vel = ground_speed_vector * (-vector_A_to_airplane_unit);
eta = atan2f(xtrack_vel, ltrack_vel);
/* bearing from current position to L1 point */
_nav_bearing = atan2f(-vector_A_to_airplane_unit(1), -vector_A_to_airplane_unit(0));
@@ -158,33 +160,38 @@ ECL_L1_Pos_Controller::navigate_waypoints(const Vector2f &vector_A, const Vector
/* calculate eta to fly to waypoint B */
/* velocity across / orthogonal to line */
xtrack_vel = ground_speed_vector % (-vector_B_to_P_unit);
float xtrack_vel = ground_speed_vector % (-vector_B_to_P_unit);
/* velocity along line */
ltrack_vel = ground_speed_vector * (-vector_B_to_P_unit);
float ltrack_vel = ground_speed_vector * (-vector_B_to_P_unit);
eta = atan2f(xtrack_vel, ltrack_vel);
/* bearing from current position to L1 point */
_nav_bearing = atan2f(-vector_B_to_P_unit(1), -vector_B_to_P_unit(0));
} else {
/* calculate eta to fly along the line between A and B */
/* velocity across / orthogonal to line */
xtrack_vel = ground_speed_vector % vector_AB;
float xtrack_vel = ground_speed_vector % vector_AB;
/* velocity along line */
ltrack_vel = ground_speed_vector * vector_AB;
float ltrack_vel = ground_speed_vector * vector_AB;
/* calculate eta2 (angle of velocity vector relative to line) */
float eta2 = atan2f(xtrack_vel, ltrack_vel);
/* calculate eta1 (angle to L1 point) */
float xtrackErr = vector_A_to_airplane % vector_AB;
float sine_eta1 = xtrackErr / math::max(_L1_distance, 0.1f);
/* limit output to 45 degrees */
sine_eta1 = math::constrain(sine_eta1, -0.7071f, 0.7071f); //sin(pi/4) = 0.7071
float eta1 = asinf(sine_eta1);
eta = eta1 + eta2;
/* bearing from current position to L1 point */
_nav_bearing = atan2f(vector_AB(1), vector_AB(0)) + eta1;
}
/* limit angle to +-90 degrees */
@@ -201,7 +208,7 @@ ECL_L1_Pos_Controller::navigate_waypoints(const Vector2f &vector_A, const Vector
}
void
ECL_L1_Pos_Controller::navigate_loiter(const Vector2f &vector_A, const Vector2f &vector_curr_position, float radius,
ECL_L1_Pos_Controller::navigate_loiter(const Vector2d &vector_A, const Vector2d &vector_curr_position, float radius,
int8_t loiter_direction, const Vector2f &ground_speed_vector)
{
/* the complete guidance logic in this section was proposed by [2] */
@@ -212,8 +219,8 @@ ECL_L1_Pos_Controller::navigate_loiter(const Vector2f &vector_A, const Vector2f
float K_velocity = 2.0f * _L1_damping * omega;
/* update bearing to next waypoint */
_target_bearing = get_bearing_to_next_waypoint((double)vector_curr_position(0), (double)vector_curr_position(1),
(double)vector_A(0), (double)vector_A(1));
_target_bearing = get_bearing_to_next_waypoint(vector_curr_position(0), vector_curr_position(1), vector_A(0),
vector_A(1));
/* ground speed, enforce minimum of 0.1 m/s to avoid singularities */
float ground_speed = math::max(ground_speed_vector.length(), 0.1f);
@@ -356,13 +363,17 @@ void ECL_L1_Pos_Controller::navigate_level_flight(float current_heading)
update_roll_setpoint();
}
Vector2f ECL_L1_Pos_Controller::get_local_planar_vector(const Vector2f &origin, const Vector2f &target) const
Vector2f ECL_L1_Pos_Controller::get_local_planar_vector(const Vector2d &origin, const Vector2d &target) const
{
/* this is an approximation for small angles, proposed by [2] */
Vector2f out(math::radians((target(0) - origin(0))),
math::radians((target(1) - origin(1))*cosf(math::radians(origin(0)))));
const double x_angle = math::radians(target(0) - origin(0));
const double y_angle = math::radians(target(1) - origin(1));
const double x_origin_cos = cos(math::radians(origin(0)));
return out * static_cast<float>(CONSTANTS_RADIUS_OF_EARTH);
return Vector2f{
static_cast<float>(x_angle * CONSTANTS_RADIUS_OF_EARTH),
static_cast<float>(y_angle *x_origin_cos * CONSTANTS_RADIUS_OF_EARTH),
};
}
void ECL_L1_Pos_Controller::set_l1_period(float period)
+4 -4
View File
@@ -143,8 +143,8 @@ public:
*
* @return sets _lateral_accel setpoint
*/
void navigate_waypoints(const matrix::Vector2f &vector_A, const matrix::Vector2f &vector_B,
const matrix::Vector2f &vector_curr_position, const matrix::Vector2f &ground_speed);
void navigate_waypoints(const matrix::Vector2d &vector_A, const matrix::Vector2d &vector_B,
const matrix::Vector2d &vector_curr_position, const matrix::Vector2f &ground_speed);
/**
* Navigate on an orbit around a loiter waypoint.
@@ -154,7 +154,7 @@ public:
*
* @return sets _lateral_accel setpoint
*/
void navigate_loiter(const matrix::Vector2f &vector_A, const matrix::Vector2f &vector_curr_position, float radius,
void navigate_loiter(const matrix::Vector2d &vector_A, const matrix::Vector2d &vector_curr_position, float radius,
int8_t loiter_direction, const matrix::Vector2f &ground_speed_vector);
/**
@@ -235,7 +235,7 @@ private:
* @param wp The point to convert to into the local coordinates, in WGS84 coordinates
* @return The vector in meters pointing from the reference position to the coordinates
*/
matrix::Vector2f get_local_planar_vector(const matrix::Vector2f &origin, const matrix::Vector2f &target) const;
matrix::Vector2f get_local_planar_vector(const matrix::Vector2d &origin, const matrix::Vector2d &target) const;
/**
* Update roll angle setpoint. This will also apply slew rate limits if set.
@@ -35,6 +35,19 @@
#include <vtol_att_control/vtol_type.h>
using math::constrain;
using math::max;
using math::min;
using math::radians;
using matrix::Dcmf;
using matrix::Eulerf;
using matrix::Quatf;
using matrix::Vector2f;
using matrix::Vector2d;
using matrix::Vector3f;
using matrix::wrap_pi;
FixedwingPositionControl::FixedwingPositionControl(bool vtol) :
ModuleParams(nullptr),
WorkItem(MODULE_NAME, px4::wq_configurations::nav_and_controllers),
@@ -587,7 +600,7 @@ FixedwingPositionControl::do_takeoff_help(float *hold_altitude, float *pitch_lim
}
bool
FixedwingPositionControl::control_position(const hrt_abstime &now, const Vector2f &curr_pos,
FixedwingPositionControl::control_position(const hrt_abstime &now, const Vector2d &curr_pos,
const Vector2f &ground_speed,
const position_setpoint_s &pos_sp_prev, const position_setpoint_s &pos_sp_curr, const position_setpoint_s &pos_sp_next)
{
@@ -662,8 +675,8 @@ FixedwingPositionControl::control_position(const hrt_abstime &now, const Vector2
_tecs.set_speed_weight(_param_fw_t_spdweight.get());
_tecs.set_height_error_time_constant(_param_fw_t_h_error_tc.get());
Vector2f curr_wp{0.0f, 0.0f};
Vector2f prev_wp{0.0f, 0.0f};
Vector2d curr_wp{0, 0};
Vector2d prev_wp{0, 0};
if (_vehicle_status.in_transition_to_fw) {
@@ -674,8 +687,8 @@ FixedwingPositionControl::control_position(const hrt_abstime &now, const Vector2
waypoint_from_heading_and_distance(_current_latitude, _current_longitude, _yaw, HDG_HOLD_DIST_NEXT, &lat_transition,
&lon_transition);
_transition_waypoint(0) = (float)lat_transition;
_transition_waypoint(1) = (float)lon_transition;
_transition_waypoint(0) = lat_transition;
_transition_waypoint(1) = lon_transition;
}
@@ -683,24 +696,25 @@ FixedwingPositionControl::control_position(const hrt_abstime &now, const Vector2
} else {
/* current waypoint (the one currently heading for) */
curr_wp = Vector2f((float)pos_sp_curr.lat, (float)pos_sp_curr.lon);
curr_wp = Vector2d(pos_sp_curr.lat, pos_sp_curr.lon);
if (pos_sp_prev.valid) {
prev_wp(0) = (float)pos_sp_prev.lat;
prev_wp(1) = (float)pos_sp_prev.lon;
prev_wp(0) = pos_sp_prev.lat;
prev_wp(1) = pos_sp_prev.lon;
} else {
/*
* No valid previous waypoint, go for the current wp.
* This is automatically handled by the L1 library.
*/
prev_wp(0) = (float)pos_sp_curr.lat;
prev_wp(1) = (float)pos_sp_curr.lon;
prev_wp(0) = pos_sp_curr.lat;
prev_wp(1) = pos_sp_curr.lon;
}
/* reset transition waypoint, will be set upon entering front transition */
_transition_waypoint.setNaN();
_transition_waypoint(0) = static_cast<double>(NAN);
_transition_waypoint(1) = static_cast<double>(NAN);
}
/* Initialize attitude controller integrator reset flags to 0 */
@@ -1007,8 +1021,8 @@ FixedwingPositionControl::control_position(const hrt_abstime &now, const Vector2
get_waypoint_heading_distance(_hdg_hold_yaw, _hdg_hold_prev_wp, _hdg_hold_curr_wp, false);
}
Vector2f prev_wp{(float)_hdg_hold_prev_wp.lat, (float)_hdg_hold_prev_wp.lon};
Vector2f curr_wp{(float)_hdg_hold_curr_wp.lat, (float)_hdg_hold_curr_wp.lon};
Vector2d prev_wp{_hdg_hold_prev_wp.lat, _hdg_hold_prev_wp.lon};
Vector2d curr_wp{_hdg_hold_curr_wp.lat, _hdg_hold_curr_wp.lon};
/* populate l1 control setpoint */
_l1_control.navigate_waypoints(prev_wp, curr_wp, curr_pos, ground_speed);
@@ -1157,24 +1171,24 @@ FixedwingPositionControl::control_position(const hrt_abstime &now, const Vector2
}
void
FixedwingPositionControl::control_takeoff(const hrt_abstime &now, const Vector2f &curr_pos,
FixedwingPositionControl::control_takeoff(const hrt_abstime &now, const Vector2d &curr_pos,
const Vector2f &ground_speed, const position_setpoint_s &pos_sp_prev, const position_setpoint_s &pos_sp_curr)
{
/* current waypoint (the one currently heading for) */
Vector2f curr_wp((float)pos_sp_curr.lat, (float)pos_sp_curr.lon);
Vector2f prev_wp{0.0f, 0.0f}; /* previous waypoint */
Vector2d curr_wp(pos_sp_curr.lat, pos_sp_curr.lon);
Vector2d prev_wp{0, 0}; /* previous waypoint */
if (pos_sp_prev.valid) {
prev_wp(0) = (float)pos_sp_prev.lat;
prev_wp(1) = (float)pos_sp_prev.lon;
prev_wp(0) = pos_sp_prev.lat;
prev_wp(1) = pos_sp_prev.lon;
} else {
/*
* No valid previous waypoint, go for the current wp.
* This is automatically handled by the L1 library.
*/
prev_wp(0) = (float)pos_sp_curr.lat;
prev_wp(1) = (float)pos_sp_curr.lon;
prev_wp(0) = pos_sp_curr.lat;
prev_wp(1) = pos_sp_curr.lon;
}
// apply flaps for takeoff according to the corresponding scale factor set
@@ -1326,24 +1340,24 @@ FixedwingPositionControl::control_takeoff(const hrt_abstime &now, const Vector2f
}
void
FixedwingPositionControl::control_landing(const hrt_abstime &now, const Vector2f &curr_pos,
FixedwingPositionControl::control_landing(const hrt_abstime &now, const Vector2d &curr_pos,
const Vector2f &ground_speed, const position_setpoint_s &pos_sp_prev, const position_setpoint_s &pos_sp_curr)
{
/* current waypoint (the one currently heading for) */
Vector2f curr_wp((float)pos_sp_curr.lat, (float)pos_sp_curr.lon);
Vector2f prev_wp{0.0f, 0.0f}; /* previous waypoint */
Vector2d curr_wp(pos_sp_curr.lat, pos_sp_curr.lon);
Vector2d prev_wp{0, 0}; /* previous waypoint */
if (pos_sp_prev.valid) {
prev_wp(0) = (float)pos_sp_prev.lat;
prev_wp(1) = (float)pos_sp_prev.lon;
prev_wp(0) = pos_sp_prev.lat;
prev_wp(1) = pos_sp_prev.lon;
} else {
/*
* No valid previous waypoint, go for the current wp.
* This is automatically handled by the L1 library.
*/
prev_wp(0) = (float)pos_sp_curr.lat;
prev_wp(1) = (float)pos_sp_curr.lon;
prev_wp(0) = pos_sp_curr.lat;
prev_wp(1) = pos_sp_curr.lon;
}
// apply full flaps for landings. this flag will also trigger the use of flaperons
@@ -1392,8 +1406,8 @@ FixedwingPositionControl::control_landing(const hrt_abstime &now, const Vector2f
create_waypoint_from_line_and_dist(pos_sp_curr.lat, pos_sp_curr.lon,
pos_sp_prev.lat, pos_sp_prev.lon, -1000.0f, &lat, &lon);
curr_wp(0) = (float)lat;
curr_wp(1) = (float)lon;
curr_wp(0) = lat;
curr_wp(1) = lon;
}
// we want the plane to keep tracking the desired flight path until we start flaring
@@ -1693,7 +1707,7 @@ FixedwingPositionControl::Run()
_vehicle_status_sub.update(&_vehicle_status);
Vector2f curr_pos((float)_current_latitude, (float)_current_longitude);
Vector2d curr_pos(_current_latitude, _current_longitude);
Vector2f ground_speed(_local_pos.vx, _local_pos.vy);
//Convert Local setpoints to global setpoints
@@ -89,22 +89,13 @@
#include <uORB/uORB.h>
#include <vtol_att_control/vtol_type.h>
using math::constrain;
using math::max;
using math::min;
using math::radians;
using matrix::Dcmf;
using matrix::Eulerf;
using matrix::Quatf;
using matrix::Vector2f;
using matrix::Vector3f;
using matrix::wrap_pi;
using namespace launchdetection;
using namespace runwaytakeoff;
using namespace time_literals;
using matrix::Vector2d;
using matrix::Vector2f;
static constexpr float HDG_HOLD_DIST_NEXT =
3000.0f; // initial distance of waypoint in front of plane in heading hold mode
static constexpr float HDG_HOLD_REACHED_DIST =
@@ -248,7 +239,7 @@ private:
bool _vtol_tailsitter{false};
Vector2f _transition_waypoint{NAN, NAN};
matrix::Vector2d _transition_waypoint{(double)NAN, (double)NAN};
// estimator reset counters
uint8_t _pos_reset_counter{0}; ///< captures the number of times the estimator has reset the horizontal position
@@ -324,13 +315,13 @@ private:
*/
void update_desired_altitude(float dt);
bool control_position(const hrt_abstime &now, const Vector2f &curr_pos, const Vector2f &ground_speed,
bool control_position(const hrt_abstime &now, const Vector2d &curr_pos, const Vector2f &ground_speed,
const position_setpoint_s &pos_sp_prev,
const position_setpoint_s &pos_sp_curr, const position_setpoint_s &pos_sp_next);
void control_takeoff(const hrt_abstime &now, const Vector2f &curr_pos, const Vector2f &ground_speed,
void control_takeoff(const hrt_abstime &now, const Vector2d &curr_pos, const Vector2f &ground_speed,
const position_setpoint_s &pos_sp_prev,
const position_setpoint_s &pos_sp_curr);
void control_landing(const hrt_abstime &now, const Vector2f &curr_pos, const Vector2f &ground_speed,
void control_landing(const hrt_abstime &now, const Vector2d &curr_pos, const Vector2f &ground_speed,
const position_setpoint_s &pos_sp_prev,
const position_setpoint_s &pos_sp_curr);
@@ -46,7 +46,6 @@
#include <systemlib/mavlink_log.h>
#include <mathlib/mathlib.h>
using matrix::Vector2f;
using namespace time_literals;
namespace runwaytakeoff
@@ -69,8 +68,8 @@ void RunwayTakeoff::init(const hrt_abstime &now, float yaw, double current_lat,
_state = RunwayTakeoffState::THROTTLE_RAMP;
_initialized_time = now;
_climbout = true; // this is true until climbout is finished
_start_wp(0) = (float)current_lat;
_start_wp(1) = (float)current_lon;
_start_wp(0) = current_lat;
_start_wp(1) = current_lon;
}
void RunwayTakeoff::update(const hrt_abstime &now, float airspeed, float alt_agl,
@@ -103,8 +102,8 @@ void RunwayTakeoff::update(const hrt_abstime &now, float airspeed, float alt_agl
* The navigator will take this as starting point to navigate towards the takeoff WP.
*/
if (_param_rwto_hdg.get() == 0) {
_start_wp(0) = (float)current_lat;
_start_wp(1) = (float)current_lon;
_start_wp(0) = current_lat;
_start_wp(1) = current_lon;
}
mavlink_log_info(mavlink_log_pub, "#Climbout");
@@ -248,14 +247,6 @@ float RunwayTakeoff::getMaxPitch(float max)
}
}
/*
* Returns the "previous" (start) WP for navigation.
*/
Vector2f RunwayTakeoff::getStartWP()
{
return _start_wp;
}
void RunwayTakeoff::reset()
{
_initialized = false;
@@ -88,7 +88,7 @@ public:
bool resetIntegrators();
float getMinPitch(float climbout_min, float min);
float getMaxPitch(float max);
matrix::Vector2f getStartWP();
const matrix::Vector2d &getStartWP() const { return _start_wp; };
void reset();
@@ -99,7 +99,7 @@ private:
hrt_abstime _initialized_time{0};
float _init_yaw{0.f};
bool _climbout{false};
matrix::Vector2f _start_wp;
matrix::Vector2d _start_wp;
DEFINE_PARAMETERS(
(ParamBool<px4::params::RWTO_TKOFF>) _param_rwto_tkoff,
@@ -149,7 +149,7 @@ RoverPositionControl::vehicle_attitude_poll()
}
bool
RoverPositionControl::control_position(const matrix::Vector2f &current_position,
RoverPositionControl::control_position(const matrix::Vector2d &current_position,
const matrix::Vector3f &ground_speed, const position_setpoint_triplet_s &pos_sp_triplet)
{
float dt = 0.01; // Using non zero value to a avoid division by zero
@@ -172,14 +172,14 @@ RoverPositionControl::control_position(const matrix::Vector2f &current_position,
//bool was_circle_mode = _gnd_control.circle_mode();
/* current waypoint (the one currently heading for) */
matrix::Vector2f curr_wp((float)pos_sp_triplet.current.lat, (float)pos_sp_triplet.current.lon);
matrix::Vector2d curr_wp(pos_sp_triplet.current.lat, pos_sp_triplet.current.lon);
/* previous waypoint */
matrix::Vector2f prev_wp = curr_wp;
matrix::Vector2d prev_wp = curr_wp;
if (pos_sp_triplet.previous.valid) {
prev_wp(0) = (float)pos_sp_triplet.previous.lat;
prev_wp(1) = (float)pos_sp_triplet.previous.lon;
prev_wp(0) = pos_sp_triplet.previous.lat;
prev_wp(1) = pos_sp_triplet.previous.lon;
}
matrix::Vector2f ground_speed_2d(ground_speed);
@@ -433,7 +433,7 @@ RoverPositionControl::run()
_pos_reset_counter = _global_pos.lat_lon_reset_counter;
matrix::Vector3f ground_speed(_local_pos.vx, _local_pos.vy, _local_pos.vz);
matrix::Vector2f current_position((float)_global_pos.lat, (float)_global_pos.lon);
matrix::Vector2d current_position(_global_pos.lat, _global_pos.lon);
matrix::Vector3f current_velocity(_local_pos.vx, _local_pos.vy, _local_pos.vz);
if (!manual_mode && _control_mode.flag_control_position_enabled) {
@@ -150,7 +150,7 @@ private:
} _pos_ctrl_state {STOPPING}; /// Position control state machine
/* previous waypoint */
matrix::Vector2f _prev_wp{0.0f, 0.0f};
matrix::Vector2d _prev_wp{0, 0};
DEFINE_PARAMETERS(
(ParamFloat<px4::params::GND_L1_PERIOD>) _param_l1_period,
@@ -190,7 +190,7 @@ private:
/**
* Control position.
*/
bool control_position(const matrix::Vector2f &global_pos, const matrix::Vector3f &ground_speed,
bool control_position(const matrix::Vector2d &global_pos, const matrix::Vector3f &ground_speed,
const position_setpoint_triplet_s &_pos_sp_triplet);
void control_velocity(const matrix::Vector3f &current_velocity, const position_setpoint_triplet_s &pos_sp_triplet);
void control_attitude(const vehicle_attitude_s &att, const vehicle_attitude_setpoint_s &att_sp);