height.cpp

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//=================================================================================================
// Copyright (c) 2011, Johannes Meyer, TU Darmstadt
// All rights reserved.

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// modification, are permitted provided that the following conditions are met:
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//     * Redistributions in binary form must reproduce the above copyright
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//     * Neither the name of the Flight Systems and Automatic Control group,
//       TU Darmstadt, nor the names of its contributors may be used to
//       endorse or promote products derived from this software without
//       specific prior written permission.

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#include <hector_pose_estimation/measurements/height.h>
#include <hector_pose_estimation/pose_estimation.h>
#include <hector_pose_estimation/global_reference.h>
#include <hector_pose_estimation/filter/set_filter.h>

#include <ros/console.h>

namespace hector_pose_estimation {

template class Measurement_<HeightModel>;

HeightModel::HeightModel()
{
  stddev_ = 10.0;
  elevation_ = 0.0;
  parameters().add("stddev", stddev_);
}

HeightModel::~HeightModel() {}

void HeightModel::getMeasurementNoise(NoiseVariance& R, const State&, bool init)
{
  if (init) {
    R(0,0) = pow(stddev_, 2);
  }
}

void HeightModel::getExpectedValue(MeasurementVector& y_pred, const State& state)
{
  y_pred(0) = state.getPosition().z() + getElevation();
}

void HeightModel::getStateJacobian(MeasurementMatrix& C, const State& state, bool init)
{
  if (!init) return; // C is time-constant

  if (state.position()) {
    state.position()->cols(C)(0,Z) = 1.0;
  }
}

HeightBaroCommon::HeightBaroCommon(Measurement* parent)
  : auto_elevation_(true)
  , elevation_initialized_(false)
{
}

HeightBaroCommon::~HeightBaroCommon() {}

void HeightBaroCommon::onReset() {
  elevation_initialized_ = false;
}

double HeightBaroCommon::resetElevation(const State &state, boost::function<double()> altitude_func) {
  if (!elevation_initialized_) {
    if (auto_elevation_) GlobalReference::Instance()->setCurrentAltitude(state, altitude_func());
    elevation_initialized_ = true;
  }

  return GlobalReference::Instance()->position().altitude;
}

Height::Height(const std::string &name)
  : Measurement_<HeightModel>(name)
  , HeightBaroCommon(this)
{
  parameters().add("auto_elevation", auto_elevation_);
}

void Height::onReset() {
  HeightBaroCommon::onReset();
}

template <typename T> struct functor_wrapper
{
  functor_wrapper(const T& value) : value(value) {}
  T& operator()() { return value; }
  const T& operator()() const { return value; }
private:
  T value;
};

bool Height::prepareUpdate(State &state, const Update &update) {
  setElevation(resetElevation(state, functor_wrapper<double>(update.getVector()(0))));
  return true;
}

} // namespace hector_pose_estimation