159 lines
4.5 KiB
C++
159 lines
4.5 KiB
C++
/*
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* This file is part of the Owl Positioning System (OwlPS).
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* OwlPS is a project of the University of Franche-Comte
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* (Université de Franche-Comté), France.
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*
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* Copyright © Université de Franche-Comté 2007-2012.
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*
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* Corresponding author: Matteo Cypriani <mcy@lm7.fr>
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*
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***********************************************************************
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*
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* This software is governed by the CeCILL license under French law and
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* abiding by the rules of distribution of free software. You can use,
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* modify and/or redistribute the software under the terms of the CeCILL
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* license as circulated by CEA, CNRS and INRIA at the following URL:
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* http://www.cecill.info
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*
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* As a counterpart to the access to the source code and rights to copy,
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* modify and redistribute granted by the license, users are provided
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* only with a limited warranty and the software's authors, the holder
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* of the economic rights, and the successive licensors have only
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* limited liability.
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*
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* In this respect, the user's attention is drawn to the risks
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* associated with loading, using, modifying and/or developing or
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* reproducing the software by the user in light of its specific status
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* of free software, that may mean that it is complicated to manipulate,
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* and that also therefore means that it is reserved for developers and
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* experienced professionals having in-depth computer knowledge. Users
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* are therefore encouraged to load and test the software's suitability
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* as regards their requirements in conditions enabling the security of
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* their systems and/or data to be ensured and, more generally, to use
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* and operate it in the same conditions as regards security.
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*
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* The fact that you are presently reading this means that you have had
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* knowledge of the CeCILL license and that you accept its terms.
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*
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***********************************************************************
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*/
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#include "accesspoint.hh"
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#include "stock.hh"
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#include "posexcept.hh"
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using namespace std ;
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using std::tr1::unordered_map ;
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/* *** Operations *** */
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double AccessPoint::friis_constant_term() const
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{
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double wavelength =
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static_cast<double>(PosUtil::LIGHT_SPEED) / frequency ;
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return antenna_gain + 20 * log10(wavelength) - 20 * log10(4 * M_PI) ;
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}
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/**
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* @param trx The transmitter AP.
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* @returns The percentage of calibration packets sent by \em trx and
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* received by the AP.
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* @returns 0 if no packet were received from \em trx.
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*/
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float AccessPoint::
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received_calibration_from_ap(const AccessPoint &trx) const
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{
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if (this == &trx)
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return 100 ;
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// If no reference point is associated with trx, no AP received
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// any calibration from it:
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const ReferencePoint *ref_trx ;
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try
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{
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ref_trx = &Stock::get_reference_point(trx.coordinates) ;
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}
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catch (element_not_found &e)
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{
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return 0 ;
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}
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// Check if trx sent a calibration request:
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const vector<CalibrationRequest*> &ref_requests =
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ref_trx->get_requests(trx.mac_addr) ;
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if (ref_requests.empty())
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return 0 ;
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// Count the number of messages sent by trx and the number of
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// messages actually received by the AP:
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unsigned int
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received_packets = 0,
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expected_packets = 0 ;
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for (vector<CalibrationRequest*>::const_iterator cr =
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ref_requests.begin() ; cr != ref_requests.end() ; ++cr)
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{
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const Measurement *const measurement =
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(*cr)->get_measurement(mac_addr) ;
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if (! measurement)
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continue ;
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received_packets += measurement->get_nb_ss() ;
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expected_packets += (*cr)->get_nb_packets() ;
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}
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if (expected_packets == 0)
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return 0 ;
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// Compute the score (percent):
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float score = received_packets * 100.0 / expected_packets ;
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return score ;
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}
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/* *** Operators *** */
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AccessPoint& AccessPoint::operator=(const AccessPoint &source)
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{
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if (this == &source)
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return *this ;
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this->WifiDevice::operator=(source) ;
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coordinates = source.coordinates ;
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frequency = source.frequency ;
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friis_index = source.friis_index ;
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return *this ;
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}
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bool AccessPoint::operator==(const AccessPoint &source) const
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{
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if (this == &source)
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return true ;
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return
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this->WifiDevice::operator==(source) &&
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coordinates == source.coordinates &&
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frequency == source.frequency &&
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friis_index == source.friis_index ;
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}
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ostream &operator<<(ostream &os, const AccessPoint &ap)
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{
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os
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<< "Coordinates: " << ap.coordinates << '\n'
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<< "Frequency: " << ap.frequency << " Hz" << '\n'
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<< "Friis index: " << ap.friis_index << '\n'
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<< (WifiDevice) ap ;
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return os ;
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}
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