ardupilot/libraries/AC_Avoidance/AC_Avoid.h

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#pragma once
#include <AP_Common/AP_Common.h>
#include <AP_Param/AP_Param.h>
#include <AP_Math/AP_Math.h>
#include <AP_AHRS/AP_AHRS.h> // AHRS library
#include <AP_InertialNav/AP_InertialNav.h> // Inertial Navigation library
#include <AC_AttitudeControl/AC_AttitudeControl.h> // Attitude controller library for sqrt controller
#include <AC_Fence/AC_Fence.h> // Failsafe fence library
#include <AP_Proximity/AP_Proximity.h>
#define AC_AVOID_ACCEL_CMSS_MAX 100.0f // maximum acceleration/deceleration in cm/s/s used to avoid hitting fence
// bit masks for enabled fence types.
#define AC_AVOID_DISABLED 0 // avoidance disabled
#define AC_AVOID_STOP_AT_FENCE 1 // stop at fence
#define AC_AVOID_USE_PROXIMITY_SENSOR 2 // stop based on proximity sensor output
#define AC_AVOID_ALL 3 // use fence and promiximity sensor
// definitions for non-GPS avoidance
#define AC_AVOID_NONGPS_DIST_MAX_DEFAULT 10.0f // objects over 10m away are ignored (default value for DIST_MAX parameter)
#define AC_AVOID_ANGLE_MAX_PERCENT 0.75f // object avoidance max lean angle as a percentage (expressed in 0 ~ 1 range) of total vehicle max lean angle
#define AC_AVOID_UPWARD_MARGIN_M 2.0f // stop 2m before objects above the vehicle
/*
* This class prevents the vehicle from leaving a polygon fence in
* 2 dimensions by limiting velocity (adjust_velocity).
*/
class AC_Avoid {
public:
/// Constructor
AC_Avoid(const AP_AHRS& ahrs, const AP_InertialNav& inav, const AC_Fence& fence, const AP_Proximity& proximity);
/*
* Adjusts the desired velocity so that the vehicle can stop
* before the fence/object.
* Note: Vector3f version is for convenience and only adjusts x and y axis
*/
void adjust_velocity(float kP, float accel_cmss, Vector2f &desired_vel);
void adjust_velocity(float kP, float accel_cmss, Vector3f &desired_vel);
// adjust vertical climb rate so vehicle does not break the vertical fence
void adjust_velocity_z(float kP, float accel_cmss, float& climb_rate_cms);
// adjust roll-pitch to push vehicle away from objects
// roll and pitch value are in centi-degrees
// angle_max is the user defined maximum lean angle for the vehicle in centi-degrees
void adjust_roll_pitch(float &roll, float &pitch, float angle_max);
// enable/disable proximity based avoidance
void proximity_avoidance_enable(bool on_off) { _proximity_enabled = on_off; }
bool proximity_avoidance_enabled() { return _proximity_enabled; }
static const struct AP_Param::GroupInfo var_info[];
private:
/*
* Adjusts the desired velocity for the circular fence.
*/
void adjust_velocity_circle_fence(float kP, float accel_cmss, Vector2f &desired_vel);
/*
* Adjusts the desired velocity for the polygon fence.
*/
void adjust_velocity_polygon_fence(float kP, float accel_cmss, Vector2f &desired_vel);
/*
* Adjusts the desired velocity based on output from the proximity sensor
*/
void adjust_velocity_proximity(float kP, float accel_cmss, Vector2f &desired_vel);
/*
* Adjusts the desired velocity given an array of boundary points
* earth_frame should be true if boundary is in earth-frame, false for body-frame
*/
void adjust_velocity_polygon(float kP, float accel_cmss, Vector2f &desired_vel, const Vector2f* boundary, uint16_t num_points, bool earth_frame);
/*
* Limits the component of desired_vel in the direction of the unit vector
* limit_direction to be at most the maximum speed permitted by the limit_distance.
*
* Uses velocity adjustment idea from Randy's second email on this thread:
* https://groups.google.com/forum/#!searchin/drones-discuss/obstacle/drones-discuss/QwUXz__WuqY/qo3G8iTLSJAJ
*/
void limit_velocity(float kP, float accel_cmss, Vector2f &desired_vel, const Vector2f& limit_direction, float limit_distance) const;
/*
* Gets the current position or altitude, relative to home (not relative to EKF origin) in cm
*/
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Vector2f get_position() const;
float get_alt_above_home() const;
/*
* Computes the speed such that the stopping distance
* of the vehicle will be exactly the input distance.
*/
float get_max_speed(float kP, float accel_cmss, float distance) const;
/*
* Computes distance required to stop, given current speed.
*/
float get_stopping_distance(float kP, float accel_cmss, float speed) const;
/*
* Gets the fence margin in cm
*/
float get_margin() const { return _fence.get_margin() * 100.0f; }
/*
* methods for avoidance in non-GPS flight modes
*/
// convert distance (in meters) to a lean percentage (in 0~1 range) for use in manual flight modes
float distance_to_lean_pct(float dist_m);
// returns the maximum positive and negative roll and pitch percentages (in -1 ~ +1 range) based on the proximity sensor
void get_proximity_roll_pitch_pct(float &roll_positive, float &roll_negative, float &pitch_positive, float &pitch_negative);
// external references
const AP_AHRS& _ahrs;
const AP_InertialNav& _inav;
const AC_Fence& _fence;
const AP_Proximity& _proximity;
// parameters
AP_Int8 _enabled;
AP_Int16 _angle_max; // maximum lean angle to avoid obstacles (only used in non-GPS flight modes)
AP_Float _dist_max; // distance (in meters) from object at which obstacle avoidance will begin in non-GPS modes
bool _proximity_enabled = true; // true if proximity sensor based avoidance is enabled (used to allow pilot to enable/disable)
};