KFStrip1DUpdator Class Reference

#include <KFStrip1DUpdator.h>

Inheritance diagram for KFStrip1DUpdator:

Public Member Functions
virtual KFStrip1DUpdator *	clone () const
	KFStrip1DUpdator ()
virtual TSOS	update (const TSOS &aTsos, const TrackingRecHit &aHit) const
	~KFStrip1DUpdator ()
Public Member Functions inherited from TrajectoryStateUpdator
	TrajectoryStateUpdator ()
virtual	~TrajectoryStateUpdator ()

Private Types
typedef LocalTrajectoryError	LTE
typedef LocalTrajectoryParameters	LTP
typedef TrajectoryStateOnSurface	TSOS

Detailed Description

A Kalman Updator that works in the measurement frame and uses only the X coordinate (the one perpendicular to the strip). Ported from ORCA.

Author

todorov, cerati

Definition at line 13 of file KFStrip1DUpdator.h.

Member Typedef Documentation

typedef LocalTrajectoryError KFStrip1DUpdator::LTE

private

Definition at line 19 of file KFStrip1DUpdator.h.

typedef LocalTrajectoryParameters KFStrip1DUpdator::LTP

private

Definition at line 18 of file KFStrip1DUpdator.h.

typedef TrajectoryStateOnSurface KFStrip1DUpdator::TSOS

private

Definition at line 17 of file KFStrip1DUpdator.h.

Constructor & Destructor Documentation

KFStrip1DUpdator::KFStrip1DUpdator ( )

inline

Definition at line 23 of file KFStrip1DUpdator.h.

Referenced by clone().

{}

KFStrip1DUpdator::~KFStrip1DUpdator ( )

inline

Definition at line 25 of file KFStrip1DUpdator.h.

{}

Member Function Documentation

virtual KFStrip1DUpdator* KFStrip1DUpdator::clone ( void  ) const

inlinevirtual

Implements TrajectoryStateUpdator.

Definition at line 29 of file KFStrip1DUpdator.h.

References KFStrip1DUpdator().

  {
    return new KFStrip1DUpdator(*this);
  }

TrajectoryStateOnSurface KFStrip1DUpdator::update ( const TSOS &  aTsos, const TrackingRecHit &  aHit  ) const

virtual

Implements TrajectoryStateUpdator.

Definition at line 5 of file KFStrip1DUpdator.cc.

References funct::C, TrajectoryStateOnSurface::globalParameters(), data-class-funcs::H, Strip1DMeasurementTransformator::hitError(), Strip1DMeasurementTransformator::hitParameters(), Exhume::I, TrajectoryStateOnSurface::localParameters(), m, GlobalTrajectoryParameters::magneticField(), Strip1DMeasurementTransformator::projectedTrajectoryError(), Strip1DMeasurementTransformator::projectedTrajectoryParameters(), Strip1DMeasurementTransformator::projectionMatrix(), LocalTrajectoryParameters::pzSign(), dttmaxenums::R, TrajectoryStateOnSurface::surface(), TrajectoryStateOnSurface::surfaceSide(), Strip1DMeasurementTransformator::trajectoryError(), Strip1DMeasurementTransformator::trajectoryParameters(), and x.

Referenced by progressbar.ProgressBar::__next__(), relval_steps.Matrix::__setitem__(), relval_steps.Steps::__setitem__(), Vispa.Gui.VispaWidget.VispaWidget::autosize(), Vispa.Views.LineDecayView.LineDecayContainer::createObject(), Vispa.Views.LineDecayView.LineDecayContainer::deselectAllObjects(), Vispa.Gui.VispaWidgetOwner.VispaWidgetOwner::deselectAllWidgets(), Vispa.Gui.VispaWidget.VispaWidget::enableAutosizing(), progressbar.ProgressBar::finish(), Vispa.Gui.MenuWidget.MenuWidget::leaveEvent(), Vispa.Gui.VispaWidgetOwner.VispaWidgetOwner::mouseMoveEvent(), Vispa.Gui.MenuWidget.MenuWidget::mouseMoveEvent(), Vispa.Views.LineDecayView.LineDecayContainer::mouseMoveEvent(), Vispa.Gui.VispaWidgetOwner.VispaWidgetOwner::mouseReleaseEvent(), Vispa.Views.LineDecayView.LineDecayContainer::objectMoved(), relval_steps.Steps::overwrite(), Vispa.Views.LineDecayView.LineDecayContainer::removeObject(), Vispa.Gui.ConnectableWidget.ConnectableWidget::removePorts(), Vispa.Gui.FindDialog.FindDialog::reset(), Vispa.Gui.PortConnection.PointToPointConnection::select(), Vispa.Gui.VispaWidget.VispaWidget::select(), Vispa.Views.LineDecayView.LineDecayContainer::select(), Vispa.Gui.VispaWidget.VispaWidget::setText(), Vispa.Gui.VispaWidget.VispaWidget::setTitle(), Vispa.Gui.ZoomableWidget.ZoomableWidget::setZoom(), Vispa.Views.LineDecayView.LineDecayContainer::setZoom(), KFSwitching1DUpdator::update(), and Vispa.Gui.PortConnection.PointToPointConnection::updateConnection().

                                                                            {

  double pzSign = aTsos.localParameters().pzSign();

  Strip1DMeasurementTransformator myTrafo(aTsos, aHit);

  double m = myTrafo.hitParameters();
  AlgebraicVector5 x(myTrafo.trajectoryParameters());
  double px = myTrafo.projectedTrajectoryParameters();
  
  AlgebraicMatrix15 H(myTrafo.projectionMatrix());
  double V = myTrafo.hitError();
  AlgebraicSymMatrix55 C(myTrafo.trajectoryError());
  double pC = myTrafo.projectedTrajectoryError();

  double R = 1./(V + pC);
  
  // Compute Kalman gain matrix
  AlgebraicMatrix51 K(R * (C * ROOT::Math::Transpose(H)));

  // Compute local filtered state vector
  AlgebraicVector5 fsv = x + K.Col(0) * (m - px);

  // Compute covariance matrix of local filtered state vector
  AlgebraicSymMatrix55 I = AlgebraicMatrixID();
  AlgebraicMatrix55 M = I - K * H;
  AlgebraicSymMatrix55 fse = ROOT::Math::Similarity(M, C) +  ROOT::Math::Similarity(K, AlgebraicSymMatrix11(V) );
//   AlgebraicMatrix M((I - K * H)*C);            // already commented when CLHEP was in use
//   AlgebraicSymMatrix fse(5,0); fse.assign(M);  // already commented when CLHEP was in use

  return TSOS( LTP(fsv, pzSign), LTE(fse), aTsos.surface(), &(aTsos.globalParameters().magneticField()), aTsos.surfaceSide() );  
}