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69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*
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Copyright (c) 2016-2020 Peter Antypas
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This file is part of the MAIANA™ transponder firmware.
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The firmware is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>
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*/
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#ifndef NOISEFLOORDETECTOR_HPP_
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#define NOISEFLOORDETECTOR_HPP_
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#include "AISChannels.h"
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#include "Events.hpp"
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#include <map>
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using namespace std;
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class NoiseFloorDetector : public EventConsumer
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{
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public:
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static NoiseFloorDetector &instance();
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// Called directly by each receiver to report every RSSI reading at every SOTDMA slot
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void report(VHFChannel channel, uint8_t rssi);
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void reset();
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// Returns the current noise floor of the channel, 0xff if unknown
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uint8_t getNoiseFloor(VHFChannel channelIndex);
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void processEvent(const Event &e);
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private:
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typedef struct
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{
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uint8_t reading;
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} Reading;
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// TODO: Use a circular buffer instead, no need for STL here
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typedef vector<Reading> ChannelReadings;
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typedef map<VHFChannel, ChannelReadings> ChannelData;
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private:
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NoiseFloorDetector();
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void processSample(ChannelReadings &window, uint8_t rssi);
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uint8_t medianValue(ChannelReadings &window);
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void dump();
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private:
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uint32_t mTicks;
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ChannelData mData;
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};
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#endif /* NOISEFLOORDETECTOR_HPP_ */
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