ardupilot/libraries/AR_WPNav/AR_WPNav.h

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#pragma once
#include <AP_Common/AP_Common.h>
#include <APM_Control/AR_AttitudeControl.h>
#include <AP_Navigation/AP_Navigation.h>
const float AR_WPNAV_HEADING_UNKNOWN = 99999.0f; // used to indicate to set_desired_location method that next leg's heading is unknown
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class AR_WPNav {
public:
// constructor
AR_WPNav(AR_AttitudeControl& atc, AP_Navigation& nav_controller);
// update navigation
void update(float dt);
// return desired speed
float get_desired_speed() const { return _desired_speed; }
// set desired speed in m/s
void set_desired_speed(float speed) { _desired_speed = MAX(speed, 0.0f); }
// restore desired speed to default from parameter value
void set_desired_speed_to_default() { _desired_speed = _speed_max; }
// execute the mission in reverse (i.e. drive backwards to destination)
bool get_reversed() const { return _reversed; }
void set_reversed(bool reversed) { _reversed = reversed; }
// get navigation outputs for speed (in m/s) and turn rate (in rad/sec)
float get_speed() const { return _desired_speed_limited; }
float get_turn_rate_rads() const { return _desired_turn_rate_rads; }
// get desired lateral acceleration (for reporting purposes only because will be zero during pivot turns)
float get_lat_accel() const { return _desired_lat_accel; }
// set desired location
// next_leg_bearing_cd should be heading to the following waypoint (used to slow the vehicle in order to make the turn)
bool set_desired_location(const struct Location& destination, float next_leg_bearing_cd = AR_WPNAV_HEADING_UNKNOWN) WARN_IF_UNUSED;
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// set desired location to a reasonable stopping point, return true on success
bool set_desired_location_to_stopping_location() WARN_IF_UNUSED;
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// set desired location as offset from the EKF origin, return true on success
bool set_desired_location_NED(const Vector3f& destination, float next_leg_bearing_cd = AR_WPNAV_HEADING_UNKNOWN) WARN_IF_UNUSED;
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// true if vehicle has reached desired location. defaults to true because this is normally used by missions and we do not want the mission to become stuck
bool reached_destination() const { return _reached_destination; }
// return distance (in meters) to destination
float get_distance_to_destination() const { return _distance_to_destination; }
// return true if destination is valid
bool is_destination_valid() const { return _orig_and_dest_valid; }
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// get current destination. Note: this is not guaranteed to be valid (i.e. _orig_and_dest_valid is not checked)
const Location &get_destination() { return _destination; }
// return heading (in degrees) and cross track error (in meters) for reporting to ground station (NAV_CONTROLLER_OUTPUT message)
float wp_bearing_cd() const { return _wp_bearing_cd; }
float nav_bearing_cd() const { return _desired_heading_cd; }
float crosstrack_error() const { return _cross_track_error; }
// settor to allow vehicle code to provide turn related param values to this library (should be updated regularly)
void set_turn_params(float turn_max_g, float turn_radius, bool pivot_possible);
// set default overshoot (used for sailboats)
void set_default_overshoot(float overshoot);
// accessors for parameter values
float get_default_speed() const { return _speed_max; }
float get_radius() const { return _radius; }
float get_overshoot() const { return _overshoot; }
float get_pivot_rate() const { return _pivot_rate; }
// parameter var table
static const struct AP_Param::GroupInfo var_info[];
private:
// true if update has been called recently
bool is_active() const;
// update distance and bearing from vehicle's current position to destination
void update_distance_and_bearing_to_destination();
// calculate steering output to drive along line from origin to destination waypoint
// relies on update_distance_and_bearing_to_destination being called first
void update_steering(const Location& current_loc, float current_speed);
// calculated desired speed(in m/s) based on yaw error and lateral acceleration and/or distance to a waypoint
// relies on update_distance_and_bearing_to_destination and update_steering being run so these internal members
// have been updated: _wp_bearing_cd, _cross_track_error, _distance_to_destination
void update_desired_speed(float dt);
// calculate stopping location using current position and attitude controller provided maximum deceleration
// returns true on success, false on failure
bool get_stopping_location(Location& stopping_loc) WARN_IF_UNUSED;
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// returns true if vehicle should pivot turn at next waypoint
bool use_pivot_steering_at_next_WP(float yaw_error_cd) const;
// returns true if vehicle should pivot immediately (because heading error is too large)
bool use_pivot_steering(float yaw_error_cd);
private:
// parameters
AP_Float _speed_max; // target speed between waypoints in m/s
AP_Float _radius; // distance in meters from a waypoint when we consider the waypoint has been reached
AP_Float _overshoot; // maximum horizontal overshoot in meters
AP_Int16 _pivot_angle; // angle error that leads to pivot turn
AP_Int16 _pivot_rate; // desired turn rate during pivot turns in deg/sec
// references
AR_AttitudeControl& _atc; // rover attitude control library
AP_Navigation& _nav_controller; // navigation controller (aka L1 controller)
// variables held in vehicle code (for now)
float _turn_max_mss; // lateral acceleration maximum in m/s/s
float _turn_radius; // vehicle turn radius in meters
bool _pivot_possible; // true if vehicle can pivot
bool _pivot_active; // true if vehicle is currently pivoting
// variables for navigation
uint32_t _last_update_ms; // system time of last call to update
Location _origin; // origin Location (vehicle will travel from the origin to the destination)
Location _destination; // destination Location when in Guided_WP
bool _orig_and_dest_valid; // true if the origin and destination have been set
bool _reversed; // execute the mission by backing up
float _desired_speed_final; // desired speed in m/s when we reach the destination
// main outputs from navigation library
float _desired_speed; // desired speed in m/s
float _desired_speed_limited; // desired speed (above) but accel/decel limited and reduced to keep vehicle within _overshoot of line
float _desired_turn_rate_rads; // desired turn-rate in rad/sec (negative is counter clockwise, positive is clockwise)
float _desired_lat_accel; // desired lateral acceleration (for reporting only)
float _desired_heading_cd; // desired heading (back towards line between origin and destination)
float _wp_bearing_cd; // heading to waypoint in centi-degrees
float _cross_track_error; // cross track error (in meters). distance from current position to closest point on line between origin and destination
// variables for reporting
float _distance_to_destination; // distance from vehicle to final destination in meters
bool _reached_destination; // true once the vehicle has reached the destination
};