AHRSFactor.h

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/* ----------------------------------------------------------------------------

 * GTSAM Copyright 2010, Georgia Tech Research Corporation,
 * Atlanta, Georgia 30332-0415
 * All Rights Reserved
 * Authors: Frank Dellaert, et al. (see THANKS for the full author list)

 * See LICENSE for the license information

 * -------------------------------------------------------------------------- */

#pragma once

/* GTSAM includes */
#include <gtsam/navigation/PreintegratedRotation.h>
#include <gtsam/nonlinear/NonlinearFactor.h>
#include <gtsam/geometry/Pose3.h>

namespace gtsam {

class GTSAM_EXPORT PreintegratedAhrsMeasurements : public PreintegratedRotation {

 protected:

  Vector3 biasHat_; 
  Matrix3 preintMeasCov_; 

  PreintegratedAhrsMeasurements() {}

  friend class AHRSFactor;

 public:

  PreintegratedAhrsMeasurements(const boost::shared_ptr<Params>& p,
      const Vector3& biasHat) :
      PreintegratedRotation(p), biasHat_(biasHat) {
    resetIntegration();
  }

  const Params& p() const { return *boost::static_pointer_cast<const Params>(p_);}
  const Vector3& biasHat() const { return biasHat_; }
  const Matrix3& preintMeasCov() const { return preintMeasCov_; }

  void print(const std::string& s = "Preintegrated Measurements: ") const;

  bool equals(const PreintegratedAhrsMeasurements&, double tol = 1e-9) const;

  void resetIntegration();

  void integrateMeasurement(const Vector3& measuredOmega, double deltaT);

  Vector3 predict(const Vector3& bias, OptionalJacobian<3,3> H = boost::none) const;

  // This function is only used for test purposes
  // (compare numerical derivatives wrt analytic ones)
  static Vector DeltaAngles(const Vector& msr_gyro_t, const double msr_dt,
      const Vector3& delta_angles);

  PreintegratedAhrsMeasurements(const Vector3& biasHat,
                                const Matrix3& measuredOmegaCovariance)
      : PreintegratedRotation(boost::make_shared<Params>()),
        biasHat_(biasHat) {
    p_->gyroscopeCovariance = measuredOmegaCovariance;
    resetIntegration();
  }

private:

  friend class boost::serialization::access;
  template<class ARCHIVE>
  void serialize(ARCHIVE & ar, const unsigned int /*version*/) {
    ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(PreintegratedRotation);
    ar & BOOST_SERIALIZATION_NVP(p_);
    ar & BOOST_SERIALIZATION_NVP(biasHat_);
  }
};

class GTSAM_EXPORT AHRSFactor: public NoiseModelFactor3<Rot3, Rot3, Vector3> {

  typedef AHRSFactor This;
  typedef NoiseModelFactor3<Rot3, Rot3, Vector3> Base;

  PreintegratedAhrsMeasurements _PIM_;

  AHRSFactor() {}

public:

#if !defined(_MSC_VER) && __GNUC__ == 4 && __GNUC_MINOR__ > 5
  typedef typename boost::shared_ptr<AHRSFactor> shared_ptr;
#else
  typedef boost::shared_ptr<AHRSFactor> shared_ptr;
#endif

  AHRSFactor(Key rot_i, Key rot_j, Key bias,
      const PreintegratedAhrsMeasurements& preintegratedMeasurements);

  virtual ~AHRSFactor() {
  }

  virtual gtsam::NonlinearFactor::shared_ptr clone() const;

  virtual void print(const std::string& s, const KeyFormatter& keyFormatter =
      DefaultKeyFormatter) const;

  virtual bool equals(const NonlinearFactor&, double tol = 1e-9) const;

  const PreintegratedAhrsMeasurements& preintegratedMeasurements() const {
    return _PIM_;
  }

  Vector evaluateError(const Rot3& rot_i, const Rot3& rot_j,
      const Vector3& bias, boost::optional<Matrix&> H1 = boost::none,
      boost::optional<Matrix&> H2 = boost::none, boost::optional<Matrix&> H3 =
          boost::none) const;

  static Rot3 Predict(
      const Rot3& rot_i, const Vector3& bias,
      const PreintegratedAhrsMeasurements preintegratedMeasurements);

  typedef PreintegratedAhrsMeasurements PreintegratedMeasurements;

  AHRSFactor(Key rot_i, Key rot_j, Key bias,
      const PreintegratedMeasurements& preintegratedMeasurements,
      const Vector3& omegaCoriolis,
      const boost::optional<Pose3>& body_P_sensor = boost::none);

  static Rot3 predict(const Rot3& rot_i, const Vector3& bias,
      const PreintegratedMeasurements preintegratedMeasurements,
      const Vector3& omegaCoriolis,
      const boost::optional<Pose3>& body_P_sensor = boost::none);

private:

  friend class boost::serialization::access;
  template<class ARCHIVE>
  void serialize(ARCHIVE & ar, const unsigned int /*version*/) {
    ar
        & boost::serialization::make_nvp("NoiseModelFactor3",
            boost::serialization::base_object<Base>(*this));
    ar & BOOST_SERIALIZATION_NVP(_PIM_);
  }

};
// AHRSFactor

} //namespace gtsam