93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
#ifndef BEACONMODELLOGDIST_H
|
|
#define BEACONMODELLOGDIST_H
|
|
|
|
#include "BeaconModel.h"
|
|
#include "../../radio/model/LogDistanceModel.h"
|
|
|
|
#include <unordered_map>
|
|
|
|
/**
|
|
* signal-strength estimation using log-distance model
|
|
*/
|
|
class BeaconModelLogDist : public BeaconModel {
|
|
|
|
public:
|
|
|
|
/** parameters describing one beacons to the model */
|
|
struct APEntry {
|
|
|
|
Point3 position_m; // the AP's position (in meter)
|
|
float txp; // sending power (-40)
|
|
float exp; // path-loss-exponent (~2.0 - 4.0)
|
|
|
|
/** ctor */
|
|
APEntry(const Point3 position_m, const float txp, const float exp) :
|
|
position_m(position_m), txp(txp), exp(exp) {;}
|
|
|
|
};
|
|
|
|
private:
|
|
|
|
/** map of all beacons (and their parameters) known to the model */
|
|
std::unordered_map<MACAddress, APEntry> beacons;
|
|
|
|
public:
|
|
|
|
/** ctor */
|
|
BeaconModelLogDist() {
|
|
;
|
|
}
|
|
|
|
/** get a list of all beacons known to the model */
|
|
std::vector<Beacon> getAllBeacons() const {
|
|
std::vector<Beacon> aps;
|
|
for (const auto it : beacons) {aps.push_back(Beacon(it.first));}
|
|
return aps;
|
|
}
|
|
|
|
/** make the given beacon (and its parameters) known to the model */
|
|
void addAP(const MACAddress& beacon, const APEntry& params) {
|
|
|
|
// sanity check
|
|
Assert::isBetween(params.txp, -50.0f, -30.0f, "TXP out of bounds [-90:-30]");
|
|
Assert::isBetween(params.exp, 1.0f, 4.0f, "EXP out of bounds [1:4]");
|
|
|
|
// add
|
|
beacons.insert( std::pair<MACAddress, APEntry>(beacon, params) );
|
|
|
|
}
|
|
|
|
void updateBeacon(const BeaconMeasurement beacon) override{
|
|
// try to get the corresponding parameters
|
|
const auto it = beacons.find(MACAddress(beacon.getBeacon().getMAC()));
|
|
|
|
// beacon unknown? -> NAN
|
|
if (it == beacons.end()) {return;}
|
|
|
|
it->second.txp = beacon.getBeacon().getTXP();
|
|
}
|
|
|
|
virtual float getRSSI(const MACAddress& beacon, const Point3 position_m) const override {
|
|
|
|
// try to get the corresponding parameters
|
|
const auto it = beacons.find(beacon);
|
|
|
|
// AP unknown? -> NAN
|
|
if (it == beacons.end()) {return NAN;}
|
|
|
|
// the beacons' parameters
|
|
const APEntry& params = it->second;
|
|
|
|
// free-space (line-of-sight) RSSI
|
|
const float distance_m = position_m.getDistance(params.position_m);
|
|
const float rssiLOS = LogDistanceModel::distanceToRssi(params.txp, params.exp, distance_m);
|
|
|
|
// done
|
|
return rssiLOS;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
#endif // BEACONMODELLOGDIST_H
|