ardupilot/libraries/AC_WPNav/AC_WPNav.h

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#pragma once
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#include <AP_Common/AP_Common.h>
#include <AP_Param/AP_Param.h>
#include <AP_Math/AP_Math.h>
#include <AP_Math/SCurve.h>
#include <AP_Math/SplineCurve.h>
#include <AP_Common/Location.h>
#include <AP_InertialNav/AP_InertialNav.h> // Inertial Navigation library
#include <AC_AttitudeControl/AC_PosControl.h> // Position control library
#include <AC_AttitudeControl/AC_AttitudeControl.h> // Attitude control library
#include <AP_Terrain/AP_Terrain.h>
#include <AC_Avoidance/AC_Avoid.h> // Stop at fence library
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class AC_WPNav
{
public:
/// Constructor
AC_WPNav(const AP_InertialNav& inav, const AP_AHRS_View& ahrs, AC_PosControl& pos_control, const AC_AttitudeControl& attitude_control);
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/// provide pointer to terrain database
void set_terrain(AP_Terrain* terrain_ptr) { _terrain = terrain_ptr; }
/// provide rangefinder altitude
void set_rangefinder_alt(bool use, bool healthy, float alt_cm) { _rangefinder_available = use; _rangefinder_healthy = healthy; _rangefinder_alt_cm = alt_cm; }
// return true if range finder may be used for terrain following
bool rangefinder_used() const { return _rangefinder_use; }
bool rangefinder_used_and_healthy() const { return _rangefinder_use && _rangefinder_healthy; }
// get expected source of terrain data if alt-above-terrain command is executed (used by Copter's ModeRTL)
enum class TerrainSource {
TERRAIN_UNAVAILABLE,
TERRAIN_FROM_RANGEFINDER,
TERRAIN_FROM_TERRAINDATABASE,
};
AC_WPNav::TerrainSource get_terrain_source() const;
// get terrain's altitude (in cm above the ekf origin) at the current position (+ve means terrain below vehicle is above ekf origin's altitude)
bool get_terrain_offset(float& offset_cm);
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// return terrain following altitude margin. vehicle will stop if distance from target altitude is larger than this margin
float get_terrain_margin() const { return MAX(_terrain_margin, 0.1); }
// convert location to vector from ekf origin. terrain_alt is set to true if resulting vector's z-axis should be treated as alt-above-terrain
// returns false if conversion failed (likely because terrain data was not available)
bool get_vector_NEU(const Location &loc, Vector3f &vec, bool &terrain_alt);
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///
/// waypoint controller
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///
/// wp_and_spline_init - initialise straight line and spline waypoint controllers
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/// speed_cms is the desired max speed to travel between waypoints. should be a positive value or omitted to use the default speed
/// updates target roll, pitch targets and I terms based on vehicle lean angles
/// should be called once before the waypoint controller is used but does not need to be called before subsequent updates to destination
void wp_and_spline_init(float speed_cms = 0.0f);
/// set current target horizontal speed during wp navigation
void set_speed_xy(float speed_cms);
/// set current target climb or descent rate during wp navigation
void set_speed_up(float speed_up_cms);
void set_speed_down(float speed_down_cms);
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/// get default target horizontal velocity during wp navigation
float get_default_speed_xy() const { return _wp_speed_cms; }
/// get default target climb speed in cm/s during missions
float get_default_speed_up() const { return _wp_speed_up_cms; }
/// get default target descent rate in cm/s during missions. Note: always positive
float get_default_speed_down() const { return fabsf(_wp_speed_down_cms); }
/// get_speed_z - returns target descent speed in cm/s during missions. Note: always positive
float get_accel_z() const { return _wp_accel_z_cmss; }
/// get_wp_acceleration - returns acceleration in cm/s/s during missions
float get_wp_acceleration() const { return _wp_accel_cmss.get(); }
/// get_wp_destination waypoint using position vector
/// x,y are distance from ekf origin in cm
/// z may be cm above ekf origin or terrain (see origin_and_destination_are_terrain_alt method)
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const Vector3f &get_wp_destination() const { return _destination; }
/// get origin using position vector (distance from ekf origin in cm)
const Vector3f &get_wp_origin() const { return _origin; }
/// true if origin.z and destination.z are alt-above-terrain, false if alt-above-ekf-origin
bool origin_and_destination_are_terrain_alt() const { return _terrain_alt; }
/// set_wp_destination waypoint using location class
/// provide the next_destination if known
/// returns false if conversion from location to vector from ekf origin cannot be calculated
bool set_wp_destination_loc(const Location& destination);
bool set_wp_destination_next_loc(const Location& destination);
// get destination as a location. Altitude frame will be absolute (AMSL) or above terrain
// returns false if unable to return a destination (for example if origin has not yet been set)
bool get_wp_destination_loc(Location& destination) const;
// returns object avoidance adjusted destination which is always the same as get_wp_destination
// having this function unifies the AC_WPNav_OA and AC_WPNav interfaces making vehicle code simpler
virtual bool get_oa_wp_destination(Location& destination) const { return get_wp_destination_loc(destination); }
/// set_wp_destination waypoint using position vector (distance from ekf origin in cm)
/// terrain_alt should be true if destination.z is a desired altitude above terrain
virtual bool set_wp_destination(const Vector3f& destination, bool terrain_alt = false);
bool set_wp_destination_next(const Vector3f& destination, bool terrain_alt = false);
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/// set waypoint destination using NED position vector from ekf origin in meters
/// provide next_destination_NED if known
bool set_wp_destination_NED(const Vector3f& destination_NED);
bool set_wp_destination_next_NED(const Vector3f& destination_NED);
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/// shifts the origin and destination horizontally to the current position
/// used to reset the track when taking off without horizontal position control
/// relies on set_wp_destination or set_wp_origin_and_destination having been called first
void shift_wp_origin_and_destination_to_current_pos_xy();
/// shifts the origin and destination horizontally to the achievable stopping point
/// used to reset the track when horizontal navigation is enabled after having been disabled (see Copter's wp_navalt_min)
/// relies on set_wp_destination or set_wp_origin_and_destination having been called first
void shift_wp_origin_and_destination_to_stopping_point_xy();
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/// get_wp_stopping_point_xy - calculates stopping point based on current position, velocity, waypoint acceleration
/// results placed in stopping_position vector
void get_wp_stopping_point_xy(Vector2f& stopping_point) const;
void get_wp_stopping_point(Vector3f& stopping_point) const;
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/// get_wp_distance_to_destination - get horizontal distance to destination in cm
virtual float get_wp_distance_to_destination() const;
/// get_bearing_to_destination - get bearing to next waypoint in centi-degrees
virtual int32_t get_wp_bearing_to_destination() const;
/// reached_destination - true when we have come within RADIUS cm of the waypoint
virtual bool reached_wp_destination() const { return _flags.reached_destination; }
// reached_wp_destination_xy - true if within RADIUS_CM of waypoint in x/y
bool reached_wp_destination_xy() const {
return get_wp_distance_to_destination() < _wp_radius_cm;
}
/// update_wpnav - run the wp controller - should be called at 100hz or higher
virtual bool update_wpnav();
// returns true if update_wpnav has been run very recently
bool is_active() const;
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///
/// spline methods
///
/// set_spline_destination waypoint using location class
/// returns false if conversion from location to vector from ekf origin cannot be calculated
/// next_destination should be the next segment's destination
/// next_is_spline should be true if next_destination is a spline segment
bool set_spline_destination_loc(const Location& destination, const Location& next_destination, bool next_is_spline);
/// set next destination (e.g. the one after the current destination) as a spline segment specified as a location
/// returns false if conversion from location to vector from ekf origin cannot be calculated
/// next_next_destination should be the next segment's destination
/// next_next_is_spline should be true if next_next_destination is a spline segment
bool set_spline_destination_next_loc(const Location& next_destination, const Location& next_next_destination, bool next_next_is_spline);
/// set_spline_destination waypoint using position vector (distance from ekf origin in cm)
/// terrain_alt should be true if destination.z is a desired altitude above terrain (false if its desired altitudes above ekf origin)
/// next_destination is the next segment's destination
/// next_terrain_alt should be true if next_destination.z is a desired altitude above terrain (false if its desired altitudes above ekf origin)
/// next_destination.z must be in the same "frame" as destination.z (i.e. if destination is a alt-above-terrain, next_destination must be too)
/// next_is_spline should be true if next_destination is a spline segment
bool set_spline_destination(const Vector3f& destination, bool terrain_alt, const Vector3f& next_destination, bool next_terrain_alt, bool next_is_spline);
/// set next destination (e.g. the one after the current destination) as an offset (in cm, NEU frame) from the EKF origin
/// next_terrain_alt should be true if next_destination.z is a desired altitude above terrain (false if its desired altitudes above ekf origin)
/// next_next_destination is the next segment's destination
/// next_next_terrain_alt should be true if next_next_destination.z is a desired altitude above terrain (false if it is desired altitude above ekf origin)
/// next_next_destination.z must be in the same "frame" as destination.z (i.e. if next_destination is a alt-above-terrain, next_next_destination must be too)
/// next_next_is_spline should be true if next_next_destination is a spline segment
bool set_spline_destination_next(const Vector3f& next_destination, bool next_terrain_alt, const Vector3f& next_next_destination, bool next_next_terrain_alt, bool next_next_is_spline);
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///
/// shared methods
///
/// get desired roll, pitch which should be fed into stabilize controllers
float get_roll() const { return _pos_control.get_roll_cd(); }
float get_pitch() const { return _pos_control.get_pitch_cd(); }
Vector3f get_thrust_vector() const { return _pos_control.get_thrust_vector(); }
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// get target yaw in centi-degrees
float get_yaw() const { return _pos_control.get_yaw_cd(); }
/// advance_wp_target_along_track - move target location along track from origin to destination
bool advance_wp_target_along_track(float dt);
/// recalculate path with update speed and/or acceleration limits
void update_track_with_speed_accel_limits();
/// return the crosstrack_error - horizontal error of the actual position vs the desired position
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float crosstrack_error() const { return _pos_control.crosstrack_error();}
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static const struct AP_Param::GroupInfo var_info[];
protected:
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// flags structure
struct wpnav_flags {
uint8_t reached_destination : 1; // true if we have reached the destination
uint8_t fast_waypoint : 1; // true if we should ignore the waypoint radius and consider the waypoint complete once the intermediate target has reached the waypoint
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uint8_t wp_yaw_set : 1; // true if yaw target has been set
} _flags;
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// helper function to calculate scurve jerk and jerk_time values
// updates _scurve_jerk and _scurve_jerk_time
void calc_scurve_jerk_and_jerk_time();
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// references and pointers to external libraries
const AP_InertialNav& _inav;
const AP_AHRS_View& _ahrs;
AC_PosControl& _pos_control;
const AC_AttitudeControl& _attitude_control;
AP_Terrain *_terrain;
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// parameters
AP_Float _wp_speed_cms; // default maximum horizontal speed in cm/s during missions
AP_Float _wp_speed_up_cms; // default maximum climb rate in cm/s
AP_Float _wp_speed_down_cms; // default maximum descent rate in cm/s
AP_Float _wp_radius_cm; // distance from a waypoint in cm that, when crossed, indicates the wp has been reached
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AP_Float _wp_accel_cmss; // horizontal acceleration in cm/s/s during missions
AP_Float _wp_accel_z_cmss; // vertical acceleration in cm/s/s during missions
AP_Float _wp_jerk; // maximum jerk used to generate scurve trajectories in m/s/s/s
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AP_Float _terrain_margin; // terrain following altitude margin. vehicle will stop if distance from target altitude is larger than this margin
float _last_wp_speed_cms; // last recorded WPNAV_SPEED, used for changing speed in-flight
// scurve
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SCurve _scurve_prev_leg; // previous scurve trajectory used to blend with current scurve trajectory
SCurve _scurve_this_leg; // current scurve trajectory
SCurve _scurve_next_leg; // next scurve trajectory used to blend with current scurve trajectory
float _scurve_jerk; // scurve jerk max in m/s/s/s
float _scurve_jerk_time; // scurve jerk time (time in seconds for jerk to increase from zero _scurve_jerk)
// spline curves
SplineCurve _spline_this_leg; // spline curve for current segment
SplineCurve _spline_next_leg; // spline curve for next segment
// the type of this leg
bool _this_leg_is_spline; // true if this leg is a spline
bool _next_leg_is_spline; // true if the next leg is a spline
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// waypoint controller internal variables
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uint32_t _wp_last_update; // time of last update_wpnav call
float _wp_desired_speed_xy_cms; // desired wp speed in cm/sec
Vector3f _origin; // starting point of trip to next waypoint in cm from ekf origin
Vector3f _destination; // target destination in cm from ekf origin
float _track_scalar_dt; // time compression multiplier to slow the progress along the track
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float _terrain_vel; // maximum horizontal velocity used to ensure the aircraft can maintain height above terrain
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float _terrain_accel; // acceleration value used to change _terrain_vel
// terrain following variables
bool _terrain_alt; // true if origin and destination.z are alt-above-terrain, false if alt-above-ekf-origin
bool _rangefinder_available; // true if rangefinder is enabled (user switch can turn this true/false)
AP_Int8 _rangefinder_use; // parameter that specifies if the range finder should be used for terrain following commands
bool _rangefinder_healthy; // true if rangefinder distance is healthy (i.e. between min and maximum)
float _rangefinder_alt_cm; // latest distance from the rangefinder
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};