Strip1DMeasurementTransformator.cc

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#include "TrackingTools/KalmanUpdators/interface/Strip1DMeasurementTransformator.h"
#include "Geometry/CommonDetUnit/interface/GeomDet.h"
#include "Geometry/CommonDetUnit/interface/GeomDetType.h"
// #include "Geometry/TrackerGeometryBuilder/interface/StripGeomDetType.h"
#include "Geometry/CommonTopologies/interface/RadialStripTopology.h"

Strip1DMeasurementTransformator::Strip1DMeasurementTransformator(const TSOS& tsos, const TrackingRecHit& hit)
    : theRecHit(hit), theState(tsos), theTopology(nullptr) {
  init();
}

void Strip1DMeasurementTransformator::init() {
  theTopology = dynamic_cast<const StripTopology*>(&(hit().detUnit()->topology()));
  theIdealTopology = dynamic_cast<const StripTopology*>(&(hit().detUnit()->type().topology()));
}

double Strip1DMeasurementTransformator::hitParameters() const {
  return topology()->measurementPosition(hit().localPosition()).x();
}

AlgebraicVector5 Strip1DMeasurementTransformator::trajectoryParameters() const {
  return state().localParameters().vector();
}

double Strip1DMeasurementTransformator::projectedTrajectoryParameters() const {
  return topology()->measurementPosition(state().localPosition()).x();
}

double Strip1DMeasurementTransformator::hitError() const {
  return topology()->measurementError(hit().localPosition(), hit().localPositionError()).uu();
}

const AlgebraicSymMatrix55& Strip1DMeasurementTransformator::trajectoryError() const {
  return state().localError().matrix();
}

double Strip1DMeasurementTransformator::projectedTrajectoryError() const {
  return topology()->measurementError(state().localPosition(), state().localError().positionError()).uu();
}

AlgebraicMatrix15 Strip1DMeasurementTransformator::projectionMatrix() const {
  //  H(measurement <- local)
  //  m_meas = H*x_local + c
  AlgebraicMatrix15 H;
  if (const RadialStripTopology* tmp = dynamic_cast<const RadialStripTopology*>(idealTopology())) {
    double yHitToInter = tmp->yDistanceToIntersection(hit().localPosition().y());
    double t = tmp->yAxisOrientation() * hit().localPosition().x() / yHitToInter;
    double c2 = 1. / (1. + t * t);  // cos(angle)**2
    //double cs = t*c2;           // sin(angle)*cos(angle); tan carries sign of sin!
    double s2 = 1. - c2;  // sin(angle)**2
    double A = tmp->angularWidth();
    // D is distance from intersection of edges to hit on strip
    double D2 = hit().localPosition().x() * hit().localPosition().x() + yHitToInter * yHitToInter;
    double D = std::sqrt(D2);

    double cp = std::sqrt(c2);
    double sp;
    if (t > 0) {
      sp = std::sqrt(s2);
    } else {
      sp = -std::sqrt(s2);
    }
    H(0, 3) = cp / (D * A);
    H(0, 4) = -sp / (D * A);
  } else {
    double phi = topology()->stripAngle(topology()->strip(state().localPosition()));
    double pitch = topology()->localPitch(state().localPosition());
    H(0, 3) = cos(phi) / pitch;
    H(0, 4) = sin(phi) / pitch;
  }
  return H;
}