76 lines
1.6 KiB
C++
76 lines
1.6 KiB
C++
#include "multilaterationalgorithm.hh"
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#include "minmax.hh"
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#include "mobile.hh"
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using namespace std ;
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using std::tr1::unordered_map ;
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/* *** Constructors *** */
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MultilaterationAlgorithm::MultilaterationAlgorithm():
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request(NULL)
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{
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// Will be changed when other multilateration methods will be
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// implemented
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multilateration_method = new MinMax(Point3D(-0.5, -0.5, 0),
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Point3D(10, 31.5, 6)) ;
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// FIXME: minmax start and stop
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}
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MultilaterationAlgorithm::~MultilaterationAlgorithm()
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{
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delete multilateration_method ;
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}
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/* *** Operations *** */
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double MultilaterationAlgorithm::
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make_constant_term(const Measurement &measurement)
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{
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assert(request) ;
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assert(request->get_mobile()) ;
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const AccessPoint *ap = measurement.get_ap() ;
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assert(ap) ;
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return
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ap->get_trx_power() +
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ap->get_antenna_gain() +
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20 * log10(
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static_cast<double>(PosUtil::LIGHT_SPEED) /
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ap->get_frequency() /
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(4 * M_PI)
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) +
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request->get_mobile()->get_antenna_gain() ;
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}
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Result MultilaterationAlgorithm::compute(const Request &_request)
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{
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request = &_request ;
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compute_ap_distance_circles() ;
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Point3D position(multilaterate()) ;
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return Result(request, position) ;
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}
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void MultilaterationAlgorithm::compute_ap_distance_circles()
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{
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ap_distances.clear() ;
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const unordered_map<string, Measurement> &measurements =
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request->get_measurements() ;
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for (unordered_map<string, Measurement>::const_iterator i =
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measurements.begin() ; i != measurements.end() ; ++i)
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ap_distances[i->second.get_ap()] = estimate_distance(i->second) ;
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}
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