64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
/* -*- c++ -*- */
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/*
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* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
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*
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* Copyright (C) 2016, Libre Space Foundation <http://librespacefoundation.org/>
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*
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* This program 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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*
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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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*
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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 <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_SATNOGS_COARSE_DOPPLER_CORRECTION_CC_H
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#define INCLUDED_SATNOGS_COARSE_DOPPLER_CORRECTION_CC_H
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#include <satnogs/api.h>
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#include <gnuradio/sync_block.h>
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namespace gr {
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namespace satnogs {
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/*!
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* \brief This block corrects the doppler effect between the ground
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* station and the satellite in a coarse and very simplified way.
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* Instead of changing the hardware center frequency, we use an NCO
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* to digitally compensate the doppler effect.
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*
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* \ingroup satnogs
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*
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*/
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class SATNOGS_API coarse_doppler_correction_cc : virtual public gr::sync_block {
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public:
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typedef boost::shared_ptr<coarse_doppler_correction_cc> sptr;
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/**
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* The doppler correction block. The input is the complex signal at
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* baseband as it comes from the SDR device.
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*
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* The message input \p freq receives periodically messages containing
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* the predicted absolute frequency of the satellite at that specific time.
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* @param target_freq the absolute frequency of the satellite
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* @param offset the frequency offset from the actuall target frequency.
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* This is very common on SDR receivers to avoid DC spikes at the center
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* frequency. This block can automatically compensate this offset
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* @param sampling_rate the sampling rate of the signal
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*/
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static sptr
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make(double target_freq, double offset, double sampling_rate);
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};
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} // namespace satnogs
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} // namespace gr
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#endif /* INCLUDED_SATNOGS_COARSE_DOPPLER_CORRECTION_CC_H */
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