ardupilot/libraries/AP_AHRS/AP_AHRS.h

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#pragma once
/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* NavEKF based AHRS (Attitude Heading Reference System) interface for
* ArduPilot
*
*/
#include <AP_HAL/AP_HAL.h>
#ifndef HAL_NAVEKF2_AVAILABLE
// only default to EK2 enabled on boards with over 1M flash
#define HAL_NAVEKF2_AVAILABLE (BOARD_FLASH_SIZE>1024)
#endif
#ifndef HAL_NAVEKF3_AVAILABLE
#define HAL_NAVEKF3_AVAILABLE 1
#endif
#include "AP_AHRS.h"
#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
#include <SITL/SITL.h>
#endif
#include <AP_ExternalAHRS/AP_ExternalAHRS.h>
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#include <AP_NavEKF2/AP_NavEKF2.h>
#include <AP_NavEKF3/AP_NavEKF3.h>
#include <AP_NavEKF/AP_Nav_Common.h> // definitions shared by inertial and ekf nav filters
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#include "AP_AHRS_DCM.h"
// forward declare view class
class AP_AHRS_View;
#define AP_AHRS_NAVEKF_SETTLE_TIME_MS 20000 // time in milliseconds the ekf needs to settle after being started
#include <AP_NMEA_Output/AP_NMEA_Output.h>
class AP_AHRS {
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friend class AP_AHRS_View;
public:
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enum Flags {
FLAG_ALWAYS_USE_EKF = 0x1,
};
// Constructor
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AP_AHRS(uint8_t flags = 0);
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// initialise
void init(void);
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/* Do not allow copies */
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CLASS_NO_COPY(AP_AHRS);
// get singleton instance
static AP_AHRS *get_singleton() {
return _singleton;
}
// allow for runtime change of orientation
// this makes initial config easier
void update_orientation();
// allow threads to lock against AHRS update
HAL_Semaphore &get_semaphore(void) {
return _rsem;
}
// return the smoothed gyro vector corrected for drift
const Vector3f &get_gyro(void) const;
// return the current drift correction integrator value
const Vector3f &get_gyro_drift(void) const;
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// reset the current gyro drift estimate
// should be called if gyro offsets are recalculated
void reset_gyro_drift();
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void update(bool skip_ins_update=false);
void reset();
// dead-reckoning support
bool get_position(struct Location &loc) const;
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// get latest altitude estimate above ground level in meters and validity flag
bool get_hagl(float &hagl) const WARN_IF_UNUSED;
// status reporting of estimated error
float get_error_rp() const;
float get_error_yaw() const;
/*
* wind estimation support
*/
// enable wind estimation
void set_wind_estimation_enabled(bool b) { wind_estimation_enabled = b; }
// wind_estimation_enabled returns true if wind estimation is enabled
bool get_wind_estimation_enabled() const { return wind_estimation_enabled; }
// return a wind estimation vector, in m/s
Vector3f wind_estimate() const;
// instruct DCM to update its wind estimate:
void estimate_wind() { dcm.estimate_wind(); }
// return the parameter AHRS_WIND_MAX in metres per second
uint8_t get_max_wind() const {
return _wind_max;
}
/*
* airspeed support
*/
// get apparent to true airspeed ratio
float get_EAS2TAS(void) const {
// FIXME: make this is a method on the active backend
return dcm.get_EAS2TAS();
}
// return an airspeed estimate if available. return true
// if we have an estimate
bool airspeed_estimate(float &airspeed_ret) const;
// return a true airspeed estimate (navigation airspeed) if
// available. return true if we have an estimate
bool airspeed_estimate_true(float &airspeed_ret) const;
// return estimate of true airspeed vector in body frame in m/s
// returns false if estimate is unavailable
bool airspeed_vector_true(Vector3f &vec) const;
// return true if airspeed comes from an airspeed sensor, as
// opposed to an IMU estimate
bool airspeed_sensor_enabled(void) const {
// FIXME: make this "using_airspeed_sensor"?
return dcm.airspeed_sensor_enabled();
}
// return true if airspeed comes from a specific airspeed sensor, as
// opposed to an IMU estimate
bool airspeed_sensor_enabled(uint8_t airspeed_index) const {
// FIXME: make this a method on the active backend
return dcm.airspeed_sensor_enabled(airspeed_index);
}
// return a synthetic airspeed estimate (one derived from sensors
// other than an actual airspeed sensor), if available. return
// true if we have a synthetic airspeed. ret will not be modified
// on failure.
bool synthetic_airspeed(float &ret) const WARN_IF_UNUSED;
// true if compass is being used
bool use_compass();
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// return the quaternion defining the rotation from NED to XYZ (body) axes
bool get_quaternion(Quaternion &quat) const WARN_IF_UNUSED;
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// return secondary attitude solution if available, as eulers in radians
bool get_secondary_attitude(Vector3f &eulers) const;
// return secondary attitude solution if available, as quaternion
bool get_secondary_quaternion(Quaternion &quat) const;
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// return secondary position solution if available
bool get_secondary_position(struct Location &loc) const;
// EKF has a better ground speed vector estimate
Vector2f groundspeed_vector();
// return ground speed estimate in meters/second. Used by ground vehicles.
float groundspeed(void);
const Vector3f &get_accel_ef(uint8_t i) const;
const Vector3f &get_accel_ef() const;
// Retrieves the corrected NED delta velocity in use by the inertial navigation
void getCorrectedDeltaVelocityNED(Vector3f& ret, float& dt) const;
// blended accelerometer values in the earth frame in m/s/s
const Vector3f &get_accel_ef_blended() const;
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// set the EKF's origin location in 10e7 degrees. This should only
// be called when the EKF has no absolute position reference (i.e. GPS)
// from which to decide the origin on its own
bool set_origin(const Location &loc) WARN_IF_UNUSED;
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// returns the inertial navigation origin in lat/lon/alt
bool get_origin(Location &ret) const WARN_IF_UNUSED;
bool have_inertial_nav() const;
bool get_velocity_NED(Vector3f &vec) const;
// return the relative position NED to either home or origin
// return true if the estimate is valid
bool get_relative_position_NED_home(Vector3f &vec) const;
bool get_relative_position_NED_origin(Vector3f &vec) const;
// return the relative position NE to either home or origin
// return true if the estimate is valid
bool get_relative_position_NE_home(Vector2f &posNE) const;
bool get_relative_position_NE_origin(Vector2f &posNE) const;
// return the relative position down to either home or origin
// baro will be used for the _home relative one if the EKF isn't
void get_relative_position_D_home(float &posD) const;
bool get_relative_position_D_origin(float &posD) const;
// Get a derivative of the vertical position in m/s which is kinematically consistent with the vertical position is required by some control loops.
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// This is different to the vertical velocity from the EKF which is not always consistent with the vertical position due to the various errors that are being corrected for.
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bool get_vert_pos_rate(float &velocity) const;
// write optical flow measurements to EKF
void writeOptFlowMeas(const uint8_t rawFlowQuality, const Vector2f &rawFlowRates, const Vector2f &rawGyroRates, const uint32_t msecFlowMeas, const Vector3f &posOffset);
// write body odometry measurements to the EKF
void writeBodyFrameOdom(float quality, const Vector3f &delPos, const Vector3f &delAng, float delTime, uint32_t timeStamp_ms, uint16_t delay_ms, const Vector3f &posOffset);
// Writes the default equivalent airspeed and its 1-sigma uncertainty in m/s to be used in forward flight if a measured airspeed is required and not available.
void writeDefaultAirSpeed(float airspeed, float uncertainty);
// Write position and quaternion data from an external navigation system
void writeExtNavData(const Vector3f &pos, const Quaternion &quat, float posErr, float angErr, uint32_t timeStamp_ms, uint16_t delay_ms, uint32_t resetTime_ms);
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// Write velocity data from an external navigation system
void writeExtNavVelData(const Vector3f &vel, float err, uint32_t timeStamp_ms, uint16_t delay_ms);
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// get speed limit
void getControlLimits(float &ekfGndSpdLimit, float &controlScaleXY) const;
float getControlScaleZ(void) const;
// is the AHRS subsystem healthy?
bool healthy() const;
// returns false if we fail arming checks, in which case the buffer will be populated with a failure message
// requires_position should be true if horizontal position configuration should be checked
bool pre_arm_check(bool requires_position, char *failure_msg, uint8_t failure_msg_len) const;
// true if the AHRS has completed initialisation
bool initialised() const;
// return true if *DCM* yaw has been initialised
bool dcm_yaw_initialised(void) const {
return dcm.yaw_initialised();
}
// get_filter_status - returns filter status as a series of flags
bool get_filter_status(nav_filter_status &status) const;
// get compass offset estimates
// true if offsets are valid
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bool getMagOffsets(uint8_t mag_idx, Vector3f &magOffsets) const;
// check all cores providing consistent attitudes for prearm checks
bool attitudes_consistent(char *failure_msg, const uint8_t failure_msg_len) const;
// return the amount of yaw angle change due to the last yaw angle reset in radians
// returns the time of the last yaw angle reset or 0 if no reset has ever occurred
uint32_t getLastYawResetAngle(float &yawAng);
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// return the amount of NE position change in meters due to the last reset
// returns the time of the last reset or 0 if no reset has ever occurred
uint32_t getLastPosNorthEastReset(Vector2f &pos);
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// return the amount of NE velocity change in meters/sec due to the last reset
// returns the time of the last reset or 0 if no reset has ever occurred
uint32_t getLastVelNorthEastReset(Vector2f &vel) const;
// return the amount of vertical position change due to the last reset in meters
// returns the time of the last reset or 0 if no reset has ever occurred
uint32_t getLastPosDownReset(float &posDelta);
// Resets the baro so that it reads zero at the current height
// Resets the EKF height to zero
// Adjusts the EKf origin height so that the EKF height + origin height is the same as before
// Returns true if the height datum reset has been performed
// If using a range finder for height no reset is performed and it returns false
bool resetHeightDatum();
// send a EKF_STATUS_REPORT for current EKF
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void send_ekf_status_report(mavlink_channel_t chan) const;
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// get_hgt_ctrl_limit - get maximum height to be observed by the control loops in meters and a validity flag
// this is used to limit height during optical flow navigation
// it will return invalid when no limiting is required
bool get_hgt_ctrl_limit(float &limit) const;
// Set to true if the terrain underneath is stable enough to be used as a height reference
// this is not related to terrain following
void set_terrain_hgt_stable(bool stable);
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// return the innovations for the specified instance
// An out of range instance (eg -1) returns data for the primary instance
bool get_innovations(Vector3f &velInnov, Vector3f &posInnov, Vector3f &magInnov, float &tasInnov, float &yawInnov) const;
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// returns true when the state estimates are significantly degraded by vibration
bool is_vibration_affected() const;
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// get_variances - provides the innovations normalised using the innovation variance where a value of 0
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// indicates perfect consistency between the measurement and the EKF solution and a value of of 1 is the maximum
// inconsistency that will be accepted by the filter
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// boolean false is returned if variances are not available
bool get_variances(float &velVar, float &posVar, float &hgtVar, Vector3f &magVar, float &tasVar) const;
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// get a source's velocity innovations
// returns true on success and results are placed in innovations and variances arguments
bool get_vel_innovations_and_variances_for_source(uint8_t source, Vector3f &innovations, Vector3f &variances) const WARN_IF_UNUSED;
// returns the expected NED magnetic field
bool get_mag_field_NED(Vector3f& ret) const;
// returns the estimated magnetic field offsets in body frame
bool get_mag_field_correction(Vector3f &ret) const;
// return the index of the airspeed we should use for airspeed measurements
// with multiple airspeed sensors and airspeed affinity in EKF3, it is possible to have switched
// over to a lane not using the primary airspeed sensor, so AHRS should know which airspeed sensor
// to use, i.e, the one being used by the primary lane. A lane switch could have happened due to an
// airspeed sensor fault, which makes this even more necessary
uint8_t get_active_airspeed_index() const;
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// return the index of the primary core or -1 if no primary core selected
int8_t get_primary_core_index() const;
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// get the index of the current primary accelerometer sensor
uint8_t get_primary_accel_index(void) const;
// get the index of the current primary gyro sensor
uint8_t get_primary_gyro_index(void) const;
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// see if EKF lane switching is possible to avoid EKF failsafe
void check_lane_switch(void);
// request EKF yaw reset to try and avoid the need for an EKF lane switch or failsafe
void request_yaw_reset(void);
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// set position, velocity and yaw sources to either 0=primary, 1=secondary, 2=tertiary
void set_posvelyaw_source_set(uint8_t source_set_idx);
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void Log_Write();
// check if non-compass sensor is providing yaw. Allows compass pre-arm checks to be bypassed
bool using_noncompass_for_yaw(void) const;
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// check if external nav is providing yaw
bool using_extnav_for_yaw(void) const;
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// set and save the ALT_M_NSE parameter value
void set_alt_measurement_noise(float noise);
// active EKF type for logging
uint8_t get_active_AHRS_type(void) const {
return uint8_t(active_EKF_type());
}
// get the selected ekf type, for allocation decisions
int8_t get_ekf_type(void) const {
return _ekf_type;
}
// these are only out here so vehicles can reference them for parameters
#if HAL_NAVEKF2_AVAILABLE
NavEKF2 EKF2;
#endif
#if HAL_NAVEKF3_AVAILABLE
NavEKF3 EKF3;
#endif
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// for holding parameters
static const struct AP_Param::GroupInfo var_info[];
// create a view
AP_AHRS_View *create_view(enum Rotation rotation, float pitch_trim_deg=0);
// write AOA and SSA information to dataflash logs:
void Write_AOA_SSA(void) const;
// return AOA
float getAOA(void) const { return _AOA; }
// return SSA
float getSSA(void) const { return _SSA; }
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/*
* trim-related functions
*/
// get trim
const Vector3f &get_trim() const { return _trim.get(); }
// set trim
void set_trim(const Vector3f &new_trim);
// add_trim - adjust the roll and pitch trim up to a total of 10 degrees
void add_trim(float roll_in_radians, float pitch_in_radians, bool save_to_eeprom = true);
// trim rotation matrices:
const Matrix3f& get_rotation_autopilot_body_to_vehicle_body(void) const { return _rotation_autopilot_body_to_vehicle_body; }
const Matrix3f& get_rotation_vehicle_body_to_autopilot_body(void) const { return _rotation_vehicle_body_to_autopilot_body; }
// Logging functions
void Log_Write_Home_And_Origin();
void Write_AHRS2(void) const;
void Write_Attitude(const Vector3f &targets) const;
void Write_Origin(uint8_t origin_type, const Location &loc) const;
void Write_POS(void) const;
// return a smoothed and corrected gyro vector in radians/second
// using the latest ins data (which may not have been consumed by
// the EKF yet)
Vector3f get_gyro_latest(void) const;
// get yaw rate in earth frame in radians/sec
float get_yaw_rate_earth(void) const {
return get_gyro() * get_rotation_body_to_ned().c;
}
/*
* home-related functionality
*/
// get the home location. This is const to prevent any changes to
// home without telling AHRS about the change
const struct Location &get_home(void) const {
return _home;
}
// functions to handle locking of home. Some vehicles use this to
// allow GCS to lock in a home location.
void lock_home() {
_home_locked = true;
}
bool home_is_locked() const {
return _home_locked;
}
// returns true if home is set
bool home_is_set(void) const {
return _home_is_set;
}
// set the home location in 10e7 degrees. This should be called
// when the vehicle is at this position. It is assumed that the
// current barometer and GPS altitudes correspond to this altitude
bool set_home(const Location &loc) WARN_IF_UNUSED;
/*
* Attitude-related public methods and attributes:
*/
// roll/pitch/yaw euler angles, all in radians
float roll;
float pitch;
float yaw;
float get_roll() const { return roll; }
float get_pitch() const { return pitch; }
float get_yaw() const { return yaw; }
// helper trig value accessors
float cos_roll() const {
return _cos_roll;
}
float cos_pitch() const {
return _cos_pitch;
}
float cos_yaw() const {
return _cos_yaw;
}
float sin_roll() const {
return _sin_roll;
}
float sin_pitch() const {
return _sin_pitch;
}
float sin_yaw() const {
return _sin_yaw;
}
// integer Euler angles (Degrees * 100)
int32_t roll_sensor;
int32_t pitch_sensor;
int32_t yaw_sensor;
const Matrix3f &get_rotation_body_to_ned(void) const;
// return a Quaternion representing our current attitude in NED frame
void get_quat_body_to_ned(Quaternion &quat) const {
quat.from_rotation_matrix(get_rotation_body_to_ned());
}
// get rotation matrix specifically from DCM backend (used for
// compass calibrator)
const Matrix3f &get_DCM_rotation_body_to_ned(void) const {
return dcm_estimates.dcm_matrix;
}
// rotate a 2D vector from earth frame to body frame
// in result, x is forward, y is right
Vector2f earth_to_body2D(const Vector2f &ef_vector) const;
// rotate a 2D vector from earth frame to body frame
// in input, x is forward, y is right
Vector2f body_to_earth2D(const Vector2f &bf) const;
// convert a vector from body to earth frame
Vector3f body_to_earth(const Vector3f &v) const {
return v * get_rotation_body_to_ned();
}
// convert a vector from earth to body frame
Vector3f earth_to_body(const Vector3f &v) const {
return get_rotation_body_to_ned().mul_transpose(v);
}
/*
* methods for the benefit of LUA bindings
*/
// return current vibration vector for primary IMU
Vector3f get_vibration(void) const;
// return primary accels, for lua
const Vector3f &get_accel(void) const {
return AP::ins().get_accel();
}
/*
* AHRS is used as a transport for vehicle-takeoff-expected and
* vehicle-landing-expected:
*/
void set_takeoff_expected(bool b);
bool get_takeoff_expected(void) const {
return takeoff_expected;
}
void set_touchdown_expected(bool b);
bool get_touchdown_expected(void) const {
return touchdown_expected;
}
/*
* fly_forward is set by the vehicles to indicate the vehicle
* should generally be moving in the direction of its heading.
* It is an additional piece of information that the backends can
* use to provide additional and/or improved estimates.
*/
void set_fly_forward(bool b) {
fly_forward = b;
}
bool get_fly_forward(void) const {
return fly_forward;
}
/* we modify our behaviour based on what sort of vehicle the
* vehicle code tells us we are. This information is also pulled
* from AP_AHRS by other libraries
*/
enum class VehicleClass : uint8_t {
UNKNOWN,
GROUND,
COPTER,
FIXED_WING,
SUBMARINE,
};
VehicleClass get_vehicle_class(void) const {
return _vehicle_class;
}
void set_vehicle_class(VehicleClass vclass) {
_vehicle_class = vclass;
}
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// get the view's rotation, or ROTATION_NONE
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enum Rotation get_view_rotation(void) const;
private:
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// optional view class
AP_AHRS_View *_view;
static AP_AHRS *_singleton;
/* we modify our behaviour based on what sort of vehicle the
* vehicle code tells us we are. This information is also pulled
* from AP_AHRS by other libraries
*/
VehicleClass _vehicle_class{VehicleClass::UNKNOWN};
// multi-thread access support
HAL_Semaphore _rsem;
/*
* Parameters
*/
AP_Int8 _wind_max;
AP_Int8 _board_orientation;
AP_Int8 _ekf_type;
AP_Float _custom_roll;
AP_Float _custom_pitch;
AP_Float _custom_yaw;
/*
* support for custom AHRS orientation, replacing _board_orientation
*/
Matrix3f _custom_rotation;
/*
* DCM-backend parameters; it takes references to these
*/
// settable parameters
AP_Float _kp_yaw;
AP_Float _kp;
AP_Float gps_gain;
AP_Float beta;
AP_Enum<GPSUse> _gps_use;
AP_Int8 _gps_minsats;
enum class EKFType {
NONE = 0
#if HAL_NAVEKF3_AVAILABLE
,THREE = 3
#endif
#if HAL_NAVEKF2_AVAILABLE
,TWO = 2
#endif
#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
,SIM = 10
#endif
#if HAL_EXTERNAL_AHRS_ENABLED
,EXTERNAL = 11
#endif
};
EKFType active_EKF_type(void) const;
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// if successful returns true and sets secondary_ekf_type to None (for DCM), EKF3 or EKF3
// returns false if no secondary (i.e. only using DCM)
bool get_secondary_EKF_type(EKFType &secondary_ekf_type) const;
bool always_use_EKF() const {
return _ekf_flags & FLAG_ALWAYS_USE_EKF;
}
/*
* Attitude-related private methods and attributes:
*/
// calculate sin/cos of roll/pitch/yaw from rotation
void calc_trig(const Matrix3f &rot,
float &cr, float &cp, float &cy,
float &sr, float &sp, float &sy) const;
// update_trig - recalculates _cos_roll, _cos_pitch, etc based on latest attitude
// should be called after _dcm_matrix is updated
void update_trig(void);
// update roll_sensor, pitch_sensor and yaw_sensor
void update_cd_values(void);
// helper trig variables
float _cos_roll{1.0f};
float _cos_pitch{1.0f};
float _cos_yaw{1.0f};
float _sin_roll;
float _sin_pitch;
float _sin_yaw;
#if HAL_NAVEKF2_AVAILABLE
void update_EKF2(void);
bool _ekf2_started;
#endif
#if HAL_NAVEKF3_AVAILABLE
bool _ekf3_started;
void update_EKF3(void);
#endif
// rotation from vehicle body to NED frame
Matrix3f _dcm_matrix;
Vector3f _gyro_drift;
Vector3f _gyro_estimate;
Vector3f _accel_ef_ekf[INS_MAX_INSTANCES];
Vector3f _accel_ef_ekf_blended;
const uint16_t startup_delay_ms = 1000;
uint32_t start_time_ms;
uint8_t _ekf_flags; // bitmask from Flags enumeration
EKFType ekf_type(void) const;
void update_DCM();
// get the index of the current primary IMU
uint8_t get_primary_IMU_index(void) const;
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/*
* home-related state
*/
void load_watchdog_home();
bool _checked_watchdog_home;
struct Location _home;
bool _home_is_set :1;
bool _home_locked :1;
// avoid setting current state repeatedly across all cores on all EKFs:
enum class TriState {
False = 0,
True = 1,
UNKNOWN = 3,
};
TriState terrainHgtStableState = TriState::UNKNOWN;
/*
* private AOA and SSA-related state and methods
*/
float _AOA, _SSA;
uint32_t _last_AOA_update_ms;
void update_AOA_SSA(void);
EKFType last_active_ekf_type;
#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
SITL::SIM *_sitl;
uint32_t _last_body_odm_update_ms;
void update_SITL(void);
#endif
#if HAL_EXTERNAL_AHRS_ENABLED
void update_external(void);
#endif
/*
* trim-related state and private methods:
*/
// a vector to capture the difference between the controller and body frames
AP_Vector3f _trim;
// cached trim rotations
Vector3f _last_trim;
Matrix3f _rotation_autopilot_body_to_vehicle_body;
Matrix3f _rotation_vehicle_body_to_autopilot_body;
// updates matrices responsible for rotating vectors from vehicle body
// frame to autopilot body frame from _trim variables
void update_trim_rotation_matrices();
/*
* AHRS is used as a transport for vehicle-takeoff-expected and
* vehicle-landing-expected:
*/
// update takeoff/touchdown flags
void update_flags();
bool takeoff_expected; // true if the vehicle is in a state that takeoff might be expected. Ground effect may be in play.
uint32_t takeoff_expected_start_ms;
bool touchdown_expected; // true if the vehicle is in a state that touchdown might be expected. Ground effect may be in play.
uint32_t touchdown_expected_start_ms;
/*
* wind estimation support
*/
bool wind_estimation_enabled;
/*
* fly_forward is set by the vehicles to indicate the vehicle
* should generally be moving in the direction of its heading.
* It is an additional piece of information that the backends can
* use to provide additional and/or improved estimates.
*/
bool fly_forward; // true if we can assume the vehicle will be flying forward on its X axis
// poke AP_Notify based on values from status
void update_notify_from_filter_status(const nav_filter_status &status);
/*
* backends (and their results)
*/
AP_AHRS_DCM dcm{_kp_yaw, _kp, gps_gain, beta, _gps_use, _gps_minsats};
struct AP_AHRS_Backend::Estimates dcm_estimates;
/*
* copy results from a backend over AP_AHRS canonical results.
* This updates member variables like roll and pitch, as well as
* updating derived values like sin_roll and sin_pitch.
*/
void copy_estimates_from_backend_estimates(const AP_AHRS_Backend::Estimates &results);
#if HAL_NMEA_OUTPUT_ENABLED
class AP_NMEA_Output* _nmea_out;
#endif
};
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namespace AP {
AP_AHRS &ahrs();
};