ardupilot/libraries/AP_NavEKF3/AP_NavEKF3.h

503 lines
29 KiB
C++

/*
24 state EKF based on the derivation in https://github.com/PX4/ecl/
blob/master/matlab/scripts/Inertial%20Nav%20EKF/GenerateNavFilterEquations.m
Converted from Matlab to C++ by Paul Riseborough
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/>.
*/
#pragma once
#include <AP_Math/AP_Math.h>
#include <AP_Param/AP_Param.h>
#include <GCS_MAVLink/GCS_MAVLink.h>
#include <AP_NavEKF/AP_Nav_Common.h>
#include <AP_Baro/AP_Baro.h>
#include <AP_Airspeed/AP_Airspeed.h>
#include <AP_Compass/AP_Compass.h>
#include <AP_RangeFinder/AP_RangeFinder.h>
class NavEKF3_core;
class AP_AHRS;
class NavEKF3 {
friend class NavEKF3_core;
public:
NavEKF3(const AP_AHRS *ahrs, const RangeFinder &rng);
/* Do not allow copies */
NavEKF3(const NavEKF3 &other) = delete;
NavEKF3 &operator=(const NavEKF3&) = delete;
static const struct AP_Param::GroupInfo var_info[];
// allow logging to determine the number of active cores
uint8_t activeCores(void) const {
return num_cores;
}
// Initialise the filter
bool InitialiseFilter(void);
// Update Filter States - this should be called whenever new IMU data is available
void UpdateFilter(void);
// check if we should write log messages
void check_log_write(void);
// Check basic filter health metrics and return a consolidated health status
bool healthy(void) const;
// returns the index of the primary core
// return -1 if no primary core selected
int8_t getPrimaryCoreIndex(void) const;
// returns the index of the IMU of the primary core
// return -1 if no primary core selected
int8_t getPrimaryCoreIMUIndex(void) const;
// Write the last calculated NE position relative to the reference point (m) for the specified instance.
// An out of range instance (eg -1) returns data for the the primary instance
// If a calculated solution is not available, use the best available data and return false
// If false returned, do not use for flight control
bool getPosNE(int8_t instance, Vector2f &posNE) const;
// Write the last calculated D position relative to the reference point (m) for the specified instance.
// An out of range instance (eg -1) returns data for the the primary instance
// If a calculated solution is not available, use the best available data and return false
// If false returned, do not use for flight control
bool getPosD(int8_t instance, float &posD) const;
// return NED velocity in m/s for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
void getVelNED(int8_t instance, Vector3f &vel) const;
// Return the rate of change of vertical position in the down direction (dPosD/dt) in m/s for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
// This can be different to the z component of the EKF velocity state because it will fluctuate with height errors and corrections in the EKF
// but will always be kinematically consistent with the z component of the EKF position state
float getPosDownDerivative(int8_t instance) const;
// This returns the specific forces in the NED frame
void getAccelNED(Vector3f &accelNED) const;
// return body axis gyro bias estimates in rad/sec for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
void getGyroBias(int8_t instance, Vector3f &gyroBias) const;
// return accelerometer bias estimate in m/s/s
// An out of range instance (eg -1) returns data for the the primary instance
void getAccelBias(int8_t instance, Vector3f &accelBias) const;
// return tilt error convergence metric for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
void getTiltError(int8_t instance, float &ang) const;
// reset body axis gyro bias estimates
void resetGyroBias(void);
// 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(void);
// Commands the EKF to not use GPS.
// This command must be sent prior to vehicle arming and EKF commencement of GPS usage
// Returns 0 if command rejected
// Returns 1 if command accepted
uint8_t setInhibitGPS(void);
// Set the argument to true to prevent the EKF using the GPS vertical velocity
// This can be used for situations where GPS velocity errors are causing problems with height accuracy
void setInhibitGpsVertVelUse(const bool varIn) { inhibitGpsVertVelUse = varIn; };
// return the horizontal speed limit in m/s set by optical flow sensor limits
// return the scale factor to be applied to navigation velocity gains to compensate for increase in velocity noise with height when using optical flow
void getEkfControlLimits(float &ekfGndSpdLimit, float &ekfNavVelGainScaler) const;
// return the NED wind speed estimates in m/s (positive is air moving in the direction of the axis)
// An out of range instance (eg -1) returns data for the the primary instance
void getWind(int8_t instance, Vector3f &wind) const;
// return earth magnetic field estimates in measurement units / 1000 for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
void getMagNED(int8_t instance, Vector3f &magNED) const;
// return body magnetic field estimates in measurement units / 1000 for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
void getMagXYZ(int8_t instance, Vector3f &magXYZ) const;
// return the magnetometer in use for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
uint8_t getActiveMag(int8_t instance) const;
// Return estimated magnetometer offsets
// Return true if magnetometer offsets are valid
bool getMagOffsets(uint8_t mag_idx, Vector3f &magOffsets) const;
// Return the last calculated latitude, longitude and height in WGS-84
// If a calculated location isn't available, return a raw GPS measurement
// The status will return true if a calculation or raw measurement is available
// The getFilterStatus() function provides a more detailed description of data health and must be checked if data is to be used for flight control
bool getLLH(struct Location &loc) const;
// Return the latitude and longitude and height used to set the NED origin for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
// All NED positions calculated by the filter are relative to this location
// Returns false if the origin has not been set
bool getOriginLLH(int8_t instance, struct Location &loc) const;
// set the latitude and longitude and height used to set the NED origin
// All NED positions calculated by the filter will be relative to this location
// The origin cannot be set if the filter is in a flight mode (eg vehicle armed)
// Returns false if the filter has rejected the attempt to set the origin
bool setOriginLLH(const Location &loc);
// return estimated height above ground level
// return false if ground height is not being estimated.
bool getHAGL(float &HAGL) const;
// return the Euler roll, pitch and yaw angle in radians for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
void getEulerAngles(int8_t instance, Vector3f &eulers) const;
// return the transformation matrix from XYZ (body) to NED axes
void getRotationBodyToNED(Matrix3f &mat) const;
// return the quaternions defining the rotation from NED to XYZ (body) axes
void getQuaternion(int8_t instance, Quaternion &quat) const;
// return the innovations for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
void getInnovations(int8_t index, Vector3f &velInnov, Vector3f &posInnov, Vector3f &magInnov, float &tasInnov, float &yawInnov) const;
// publish output observer angular, velocity and position tracking error
void getOutputTrackingError(int8_t instance, Vector3f &error) const;
// return the innovation consistency test ratios for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
void getVariances(int8_t instance, float &velVar, float &posVar, float &hgtVar, Vector3f &magVar, float &tasVar, Vector2f &offset) const;
// return the diagonals from the covariance matrix for the specified instance
void getStateVariances(int8_t instance, float stateVar[24]) const;
// should we use the compass? This is public so it can be used for
// reporting via ahrs.use_compass()
bool use_compass(void) const;
// write the raw optical flow measurements
// rawFlowQuality is a measured of quality between 0 and 255, with 255 being the best quality
// rawFlowRates are the optical flow rates in rad/sec about the X and Y sensor axes.
// rawGyroRates are the sensor rotation rates in rad/sec measured by the sensors internal gyro
// The sign convention is that a RH physical rotation of the sensor about an axis produces both a positive flow and gyro rate
// msecFlowMeas is the scheduler time in msec when the optical flow data was received from the sensor.
// posOffset is the XYZ flow sensor position in the body frame in m
void writeOptFlowMeas(uint8_t &rawFlowQuality, Vector2f &rawFlowRates, Vector2f &rawGyroRates, uint32_t &msecFlowMeas, const Vector3f &posOffset);
/*
* Write body frame linear and angular displacement measurements from a visual odometry sensor
*
* quality is a normalised confidence value from 0 to 100
* delPos is the XYZ change in linear position measured in body frame and relative to the inertial reference at timeStamp_ms (m)
* delAng is the XYZ angular rotation measured in body frame and relative to the inertial reference at timeStamp_ms (rad)
* delTime is the time interval for the measurement of delPos and delAng (sec)
* timeStamp_ms is the timestamp of the last image used to calculate delPos and delAng (msec)
* posOffset is the XYZ body frame position of the camera focal point (m)
*/
void writeBodyFrameOdom(float quality, const Vector3f &delPos, const Vector3f &delAng, float delTime, uint32_t timeStamp_ms, const Vector3f &posOffset);
/*
* Write odometry data from a wheel encoder. The axis of rotation is assumed to be parallel to the vehicle body axis
*
* delAng is the measured change in angular position from the previous measurement where a positive rotation is produced by forward motion of the vehicle (rad)
* delTime is the time interval for the measurement of delAng (sec)
* timeStamp_ms is the time when the rotation was last measured (msec)
* posOffset is the XYZ body frame position of the wheel hub (m)
* radius is the effective rolling radius of the wheel (m)
*/
void writeWheelOdom(float delAng, float delTime, uint32_t timeStamp_ms, const Vector3f &posOffset, float radius);
/*
* Return data for debugging body frame odometry fusion:
*
* velInnov are the XYZ body frame velocity innovations (m/s)
* velInnovVar are the XYZ body frame velocity innovation variances (m/s)**2
*
* Return the system time stamp of the last update (msec)
*/
uint32_t getBodyFrameOdomDebug(int8_t instance, Vector3f &velInnov, Vector3f &velInnovVar) const;
// return data for debugging optical flow fusion for the specified instance
// An out of range instance (eg -1) returns data for the the primary instance
void getFlowDebug(int8_t instance, float &varFlow, float &gndOffset, float &flowInnovX, float &flowInnovY, float &auxInnov, float &HAGL, float &rngInnov, float &range, float &gndOffsetErr) const;
/*
Returns the following data for debugging range beacon fusion
ID : beacon identifier
rng : measured range to beacon (m)
innov : range innovation (m)
innovVar : innovation variance (m^2)
testRatio : innovation consistency test ratio
beaconPosNED : beacon NED position (m)
offsetHigh : high hypothesis for range beacons system vertical offset (m)
offsetLow : low hypothesis for range beacons system vertical offset (m)
posNED : North,East,Down position estimate of receiver from 3-state filter
returns true if data could be found, false if it could not
*/
bool getRangeBeaconDebug(int8_t instance, uint8_t &ID, float &rng, float &innov, float &innovVar, float &testRatio, Vector3f &beaconPosNED,
float &offsetHigh, float &offsetLow, Vector3f &posNED) const;
// called by vehicle code to specify that a takeoff is happening
// causes the EKF to compensate for expected barometer errors due to ground effect
void setTakeoffExpected(bool val);
// called by vehicle code to specify that a touchdown is expected to happen
// causes the EKF to compensate for expected barometer errors due to ground effect
void setTouchdownExpected(bool val);
// Set to true if the terrain underneath is stable enough to be used as a height reference
// in combination with a range finder. Set to false if the terrain underneath the vehicle
// cannot be used as a height reference
void setTerrainHgtStable(bool val);
/*
return the filter fault status as a bitmasked integer for the specified instance
An out of range instance (eg -1) returns data for the the primary instance
0 = quaternions are NaN
1 = velocities are NaN
2 = badly conditioned X magnetometer fusion
3 = badly conditioned Y magnetometer fusion
5 = badly conditioned Z magnetometer fusion
6 = badly conditioned airspeed fusion
7 = badly conditioned synthetic sideslip fusion
7 = filter is not initialised
*/
void getFilterFaults(int8_t instance, uint16_t &faults) const;
/*
return filter timeout status as a bitmasked integer for the specified instance
An out of range instance (eg -1) returns data for the the primary instance
0 = position measurement timeout
1 = velocity measurement timeout
2 = height measurement timeout
3 = magnetometer measurement timeout
5 = unassigned
6 = unassigned
7 = unassigned
7 = unassigned
*/
void getFilterTimeouts(int8_t instance, uint8_t &timeouts) const;
/*
return filter gps quality check status for the specified instance
An out of range instance (eg -1) returns data for the the primary instance
*/
void getFilterGpsStatus(int8_t instance, nav_gps_status &faults) const;
/*
return filter status flags for the specified instance
An out of range instance (eg -1) returns data for the the primary instance
*/
void getFilterStatus(int8_t instance, nav_filter_status &status) const;
// send an EKF_STATUS_REPORT message to GCS
void send_status_report(mavlink_channel_t chan);
// provides the height limit to be observed by the control loops
// returns false if no height limiting is required
// this is needed to ensure the vehicle does not fly too high when using optical flow navigation
bool getHeightControlLimit(float &height) const;
// return the amount of yaw angle change (in radians) due to the last yaw angle reset or core selection switch
// returns the time of the last yaw angle reset or 0 if no reset has ever occurred
uint32_t getLastYawResetAngle(float &yawAngDelta);
// return the amount of NE position change due to the last position reset in metres
// returns the time of the last reset or 0 if no reset has ever occurred
uint32_t getLastPosNorthEastReset(Vector2f &posDelta);
// return the amount of NE velocity change due to the last velocity reset in metres/sec
// 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 metres
// returns the time of the last reset or 0 if no reset has ever occurred
uint32_t getLastPosDownReset(float &posDelta);
// report any reason for why the backend is refusing to initialise
const char *prearm_failure_reason(void) const;
// set and save the _baroAltNoise parameter
void set_baro_alt_noise(float noise) { _baroAltNoise.set_and_save(noise); };
// allow the enable flag to be set by Replay
void set_enable(bool enable) { _enable.set(enable); }
// are we doing sensor logging inside the EKF?
bool have_ekf_logging(void) const { return logging.enabled && _logging_mask != 0; }
// get timing statistics structure
void getTimingStatistics(int8_t instance, struct ekf_timing &timing) const;
private:
uint8_t num_cores; // number of allocated cores
uint8_t primary; // current primary core
NavEKF3_core *core = nullptr;
const AP_AHRS *_ahrs;
const RangeFinder &_rng;
uint32_t _frameTimeUsec; // time per IMU frame
uint8_t _framesPerPrediction; // expected number of IMU frames per prediction
// EKF Mavlink Tuneable Parameters
AP_Int8 _enable; // zero to disable EKF3
AP_Float _gpsHorizVelNoise; // GPS horizontal velocity measurement noise : m/s
AP_Float _gpsVertVelNoise; // GPS vertical velocity measurement noise : m/s
AP_Float _gpsHorizPosNoise; // GPS horizontal position measurement noise m
AP_Float _baroAltNoise; // Baro height measurement noise : m
AP_Float _magNoise; // magnetometer measurement noise : gauss
AP_Float _easNoise; // equivalent airspeed measurement noise : m/s
AP_Float _windVelProcessNoise; // wind velocity state process noise : m/s^2
AP_Float _wndVarHgtRateScale; // scale factor applied to wind process noise due to height rate
AP_Float _magEarthProcessNoise; // Earth magnetic field process noise : gauss/sec
AP_Float _magBodyProcessNoise; // Body magnetic field process noise : gauss/sec
AP_Float _gyrNoise; // gyro process noise : rad/s
AP_Float _accNoise; // accelerometer process noise : m/s^2
AP_Float _gyroBiasProcessNoise; // gyro bias state process noise : rad/s
AP_Float _accelBiasProcessNoise;// accel bias state process noise : m/s^2
AP_Int16 _hgtDelay_ms; // effective average delay of Height measurements relative to inertial measurements (msec)
AP_Int8 _fusionModeGPS; // 0 = use 3D velocity, 1 = use 2D velocity, 2 = use no velocity
AP_Int16 _gpsVelInnovGate; // Percentage number of standard deviations applied to GPS velocity innovation consistency check
AP_Int16 _gpsPosInnovGate; // Percentage number of standard deviations applied to GPS position innovation consistency check
AP_Int16 _hgtInnovGate; // Percentage number of standard deviations applied to height innovation consistency check
AP_Int16 _magInnovGate; // Percentage number of standard deviations applied to magnetometer innovation consistency check
AP_Int16 _tasInnovGate; // Percentage number of standard deviations applied to true airspeed innovation consistency check
AP_Int8 _magCal; // Sets activation condition for in-flight magnetometer calibration
AP_Int8 _gpsGlitchRadiusMax; // Maximum allowed discrepancy between inertial and GPS Horizontal position before GPS glitch is declared : m
AP_Float _flowNoise; // optical flow rate measurement noise
AP_Int16 _flowInnovGate; // Percentage number of standard deviations applied to optical flow innovation consistency check
AP_Int8 _flowDelay_ms; // effective average delay of optical flow measurements rel to IMU (msec)
AP_Int16 _rngInnovGate; // Percentage number of standard deviations applied to range finder innovation consistency check
AP_Float _maxFlowRate; // Maximum flow rate magnitude that will be accepted by the filter
AP_Int8 _altSource; // Primary alt source during optical flow navigation. 0 = use Baro, 1 = use range finder.
AP_Float _rngNoise; // Range finder noise : m
AP_Int8 _gpsCheck; // Bitmask controlling which preflight GPS checks are bypassed
AP_Int8 _imuMask; // Bitmask of IMUs to instantiate EKF3 for
AP_Int16 _gpsCheckScaler; // Percentage increase to be applied to GPS pre-flight accuracy and drift thresholds
AP_Float _noaidHorizNoise; // horizontal position measurement noise assumed when synthesised zero position measurements are used to constrain attitude drift : m
AP_Int8 _logging_mask; // mask of IMUs to log
AP_Float _yawNoise; // magnetic yaw measurement noise : rad
AP_Int16 _yawInnovGate; // Percentage number of standard deviations applied to magnetic yaw innovation consistency check
AP_Int8 _tauVelPosOutput; // Time constant of output complementary filter : csec (centi-seconds)
AP_Int8 _useRngSwHgt; // Maximum valid range of the range finder as a percentage of the maximum range specified by the sensor driver
AP_Float _terrGradMax; // Maximum terrain gradient below the vehicle
AP_Float _rngBcnNoise; // Range beacon measurement noise (m)
AP_Int16 _rngBcnInnovGate; // Percentage number of standard deviations applied to range beacon innovation consistency check
AP_Int8 _rngBcnDelay_ms; // effective average delay of range beacon measurements rel to IMU (msec)
AP_Float _useRngSwSpd; // Maximum horizontal ground speed to use range finder as the primary height source (m/s)
AP_Float _accBiasLim; // Accelerometer bias limit (m/s/s)
AP_Int8 _magMask; // Bitmask forcng specific EKF core instances to use simple heading magnetometer fusion.
AP_Int8 _originHgtMode; // Bitmask controlling post alignment correction and reporting of the EKF origin height.
AP_Float _visOdmVelErrMax; // Observation 1-STD velocity error assumed for visual odometry sensor at lowest reported quality (m/s)
AP_Float _visOdmVelErrMin; // Observation 1-STD velocity error assumed for visual odometry sensor at highest reported quality (m/s)
AP_Float _wencOdmVelErr; // Observation 1-STD velocity error assumed for wheel odometry sensor (m/s)
// Tuning parameters
const float gpsNEVelVarAccScale = 0.05f; // Scale factor applied to NE velocity measurement variance due to manoeuvre acceleration
const float gpsDVelVarAccScale = 0.07f; // Scale factor applied to vertical velocity measurement variance due to manoeuvre acceleration
const float gpsPosVarAccScale = 0.05f; // Scale factor applied to horizontal position measurement variance due to manoeuvre acceleration
const uint16_t magDelay_ms = 60; // Magnetometer measurement delay (msec)
const uint16_t tasDelay_ms = 100; // Airspeed measurement delay (msec)
const uint16_t tiltDriftTimeMax_ms = 15000; // Maximum number of ms allowed without any form of tilt aiding (GPS, flow, TAS, etc)
const uint16_t posRetryTimeUseVel_ms = 10000; // Position aiding retry time with velocity measurements (msec)
const uint16_t posRetryTimeNoVel_ms = 7000; // Position aiding retry time without velocity measurements (msec)
const uint16_t hgtRetryTimeMode0_ms = 10000; // Height retry time with vertical velocity measurement (msec)
const uint16_t hgtRetryTimeMode12_ms = 5000; // Height retry time without vertical velocity measurement (msec)
const uint16_t tasRetryTime_ms = 5000; // True airspeed timeout and retry interval (msec)
const uint32_t magFailTimeLimit_ms = 10000; // number of msec before a magnetometer failing innovation consistency checks is declared failed (msec)
const float magVarRateScale = 0.005f; // scale factor applied to magnetometer variance due to angular rate
const float gyroBiasNoiseScaler = 2.0f; // scale factor applied to gyro bias state process noise when on ground
const uint16_t hgtAvg_ms = 100; // average number of msec between height measurements
const uint16_t betaAvg_ms = 100; // average number of msec between synthetic sideslip measurements
const float covTimeStepMax = 0.1f; // maximum time (sec) between covariance prediction updates
const float covDelAngMax = 0.05f; // maximum delta angle between covariance prediction updates
const float DCM33FlowMin = 0.71f; // If Tbn(3,3) is less than this number, optical flow measurements will not be fused as tilt is too high.
const float fScaleFactorPnoise = 1e-10f; // Process noise added to focal length scale factor state variance at each time step
const uint8_t flowTimeDeltaAvg_ms = 100; // average interval between optical flow measurements (msec)
const uint32_t flowIntervalMax_ms = 100; // maximum allowable time between flow fusion events
const uint16_t gndEffectTimeout_ms = 1000; // time in msec that ground effect mode is active after being activated
const float gndEffectBaroScaler = 4.0f; // scaler applied to the barometer observation variance when ground effect mode is active
const uint8_t gndGradientSigma = 50; // RMS terrain gradient percentage assumed by the terrain height estimation
const uint16_t fusionTimeStep_ms = 10; // The minimum time interval between covariance predictions and measurement fusions in msec
const uint8_t sensorIntervalMin_ms = 50; // The minimum allowed time between measurements from any non-IMU sensor (msec)
struct {
bool enabled:1;
bool log_compass:1;
bool log_gps:1;
bool log_baro:1;
bool log_imu:1;
} logging;
// time at start of current filter update
uint64_t imuSampleTime_us;
struct {
uint32_t last_function_call; // last time getLastYawYawResetAngle was called
bool core_changed; // true when a core change happened and hasn't been consumed, false otherwise
uint32_t last_primary_change; // last time a primary has changed
float core_delta; // the amount of yaw change between cores when a change happened
} yaw_reset_data;
struct {
uint32_t last_function_call; // last time getLastPosNorthEastReset was called
bool core_changed; // true when a core change happened and hasn't been consumed, false otherwise
uint32_t last_primary_change; // last time a primary has changed
Vector2f core_delta; // the amount of NE position change between cores when a change happened
} pos_reset_data;
struct {
uint32_t last_function_call; // last time getLastPosDownReset was called
bool core_changed; // true when a core change happened and hasn't been consumed, false otherwise
uint32_t last_primary_change; // last time a primary has changed
float core_delta; // the amount of D position change between cores when a change happened
} pos_down_reset_data;
bool runCoreSelection; // true when the primary core has stabilised and the core selection logic can be started
bool coreSetupRequired[7]; // true when this core index needs to be setup
uint8_t coreImuIndex[7]; // IMU index used by this core
bool inhibitGpsVertVelUse; // true when GPS vertical velocity use is prohibited
// update the yaw reset data to capture changes due to a lane switch
// new_primary - index of the ekf instance that we are about to switch to as the primary
// old_primary - index of the ekf instance that we are currently using as the primary
void updateLaneSwitchYawResetData(uint8_t new_primary, uint8_t old_primary);
// update the position reset data to capture changes due to a lane switch
// new_primary - index of the ekf instance that we are about to switch to as the primary
// old_primary - index of the ekf instance that we are currently using as the primary
void updateLaneSwitchPosResetData(uint8_t new_primary, uint8_t old_primary);
// update the position down reset data to capture changes due to a lane switch
// new_primary - index of the ekf instance that we are about to switch to as the primary
// old_primary - index of the ekf instance that we are currently using as the primary
void updateLaneSwitchPosDownResetData(uint8_t new_primary, uint8_t old_primary);
};