owlps/owlps-positioning/src/interlinknetworks.cc

#include "interlinknetworks.hh"
#include "mobile.hh"

using std::tr1::unordered_map ;



float InterlinkNetworks::estimate_distance(const Measurement &measurement)
{
  assert(request) ;

  const AccessPoint &ap = *measurement.get_ap() ;
  assert(&ap) ;

  double constant_term =
    ap.get_trx_power() +
    ap.get_antenna_gain() +
    20 * log10(
      300000000.0 /
      ap.get_frequency() /
      (4 * M_PI)
    ) +
    request->get_mobile()->get_antenna_gain() ;
  const float &average_ss = measurement.get_average_ss() ;
  return pow(10, (constant_term - average_ss) / 35) ;
}