2012-02-06 16:44:09 +01:00
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/*
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* This file is part of the Owl Positioning System (OwlPS).
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2012-11-03 14:52:33 +01:00
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* OwlPS is a project of the University of Franche-Comte
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2012-02-06 16:44:09 +01:00
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* (Université de Franche-Comté), France.
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2012-11-03 14:52:33 +01:00
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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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2012-02-06 16:44:09 +01:00
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*/
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2010-06-10 15:57:03 +02:00
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#include "fbcm.hh"
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2011-08-01 20:28:43 +02:00
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#include "stock.hh"
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#include "configuration.hh"
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2010-06-10 15:57:03 +02:00
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2011-08-01 20:28:43 +02:00
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Result FBCM::compute(const Request &_request)
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{
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// If the autocalibration is activated, we have to regenerate the
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// Friis indexes each time we calculate a position
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if (Configuration::bool_value("positioning.generate-reference-points"))
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Stock::update_all_friis_indexes() ;
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2012-04-11 16:31:48 +02:00
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return TrilaterationAlgorithm::compute(_request) ;
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2011-08-01 20:28:43 +02:00
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}
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2010-06-10 15:57:03 +02:00
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float FBCM::estimate_distance(const Measurement &measurement)
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{
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double constant_term = make_constant_term(measurement) ;
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2012-02-03 11:55:24 +01:00
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const float &average_dbm = measurement.get_average_dbm() ;
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2010-06-10 15:57:03 +02:00
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const AccessPoint *ap = measurement.get_ap() ;
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2012-02-03 11:55:24 +01:00
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return pow(10, (constant_term - average_dbm) /
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2010-06-14 17:15:48 +02:00
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(10 * friis_index(ap))) ;
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}
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inline float FBCM::friis_index(const AccessPoint *const ap) const
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{
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return ap->get_friis_index() ;
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2010-06-10 15:57:03 +02:00
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}
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