mirror of https://github.com/gnss-sdr/gnss-sdr
83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
/*!
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* \file notch_cc.h
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* \brief Implements a notch filter algorithm
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* \author Antonio Ramos (antonio.ramosdet(at)gmail.com)
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR 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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* GNSS-SDR 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 GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#ifndef GNSS_SDR_NOTCH_H_
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#define GNSS_SDR_NOTCH_H_
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#include <boost/shared_ptr.hpp>
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#include <gnuradio/block.h>
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#include <gnuradio/fft/fft.h>
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#include <cstdint>
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#include <memory>
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class Notch;
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using notch_sptr = boost::shared_ptr<Notch>;
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notch_sptr make_notch_filter(float pfa, float p_c_factor,
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int32_t length_, int32_t n_segments_est, int32_t n_segments_reset);
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/*!
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* \brief This class implements a real-time software-defined multi state notch filter
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*/
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class Notch : public gr::block
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{
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public:
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Notch(float pfa, float p_c_factor, int32_t length_, int32_t n_segments_est, int32_t n_segments_reset);
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~Notch();
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void forecast(int noutput_items, gr_vector_int &ninput_items_required);
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int general_work(int noutput_items, gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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private:
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float pfa;
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float noise_pow_est;
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float thres_;
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int32_t length_;
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int32_t n_deg_fred;
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uint32_t n_segments;
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uint32_t n_segments_est;
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uint32_t n_segments_reset;
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bool filter_state_;
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gr_complex last_out;
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gr_complex z_0;
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gr_complex p_c_factor;
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gr_complex *c_samples;
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float *angle_;
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float *power_spect;
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std::unique_ptr<gr::fft::fft_complex> d_fft;
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};
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#endif // GNSS_SDR_NOTCH_H_
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