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Small refactor, save on transpose and copy

release/4.3a0
dellaert 2014-11-23 11:24:43 +01:00
parent 7683917558
commit 5ec6039988
1 changed files with 15 additions and 15 deletions
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30
gtsam/navigation/AHRSFactor.cpp
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@ -100,34 +100,34 @@ void AHRSFactor::PreintegratedMeasurements::integrateMeasurement(
const Vector3 theta_incr = correctedOmega * deltaT;
// rotation increment computed from the current rotation rate measurement
const Rot3 Rincr = Rot3::Expmap(theta_incr);
const Rot3 incrR = Rot3::Expmap(theta_incr);
const Matrix3 incrRt = incrR.transpose();
// Right jacobian computed at theta_incr
// Right Jacobian computed at theta_incr
const Matrix3 Jr_theta_incr = Rot3::rightJacobianExpMapSO3(theta_incr);
// Update Jacobians
// ---------------------------------------------------------------------------
delRdelBiasOmega_ = Rincr.transpose() * delRdelBiasOmega_
- Jr_theta_incr * deltaT;
delRdelBiasOmega_ = incrRt * delRdelBiasOmega_ - Jr_theta_incr * deltaT;
// Update preintegrated measurements covariance
// ---------------------------------------------------------------------------
const Vector3 theta_i = Rot3::Logmap(deltaRij_); // parametrization of so(3)
const Vector3 theta_i = Rot3::Logmap(deltaRij_); // Parameterization of so(3)
const Matrix3 Jr_theta_i = Rot3::rightJacobianExpMapSO3inverse(theta_i);
Rot3 Rot_j = deltaRij_ * Rincr;
const Vector3 theta_j = Rot3::Logmap(Rot_j); // parametrization of so(3)
Rot3 Rot_j = deltaRij_ * incrR;
const Vector3 theta_j = Rot3::Logmap(Rot_j); // Parameterization of so(3)
const Matrix3 Jrinv_theta_j = Rot3::rightJacobianExpMapSO3inverse(theta_j);
// Update preintegrated measurements covariance: as in [2] we consider a first order propagation that
// can be seen as a prediction phase in an EKF framework
Matrix3 H_angles_angles = Jrinv_theta_j * Rincr.transpose() * Jr_theta_i;
// Update preintegrated measurements covariance: as in [2] we consider a first
// order propagation that can be seen as a prediction phase in an EKF framework
Matrix3 H_angles_angles = Jrinv_theta_j * incrRt * Jr_theta_i;
// analytic expression corresponding to the following numerical derivative
// Matrix H_angles_angles = numericalDerivative11<LieVector, LieVector>(boost::bind(&PreIntegrateIMUObservations_delta_angles, correctedOmega, deltaT, _1), thetaij);
// Matrix H_angles_angles = numericalDerivative11<LieVector, LieVector>
// (boost::bind(&PreIntegrateIMUObservations_delta_angles, correctedOmega, deltaT, _1), thetaij);
// overall Jacobian wrt preintegrated measurements (df/dx)
Matrix3 F;
F << H_angles_angles;
// overall Jacobian wrpt preintegrated measurements (df/dx)
const Matrix3& F = H_angles_angles;
// first order uncertainty propagation
// the deltaT allows to pass from continuous time noise to discrete time noise
@ -136,7 +136,7 @@ void AHRSFactor::PreintegratedMeasurements::integrateMeasurement(
// Update preintegrated measurements
// ---------------------------------------------------------------------------
deltaRij_ = deltaRij_ * Rincr;
deltaRij_ = deltaRij_ * incrR;
deltaTij_ += deltaT;
}