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/*
gr-scan - A GNU Radio signal scanner
Copyright (C) 2015 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
Copyright (C) 2012 Nicholas Tomlinson
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <cmath>
#include <stdint.h>
#include <gnuradio/top_block.h>
#include <osmosdr/source.h>
#include <gnuradio/blocks/stream_to_vector.h>
#include <gnuradio/fft/fft_vcc.h>
#include <gnuradio/blocks/complex_to_mag_squared.h>
#include <gnuradio/filter/single_pole_iir_filter_ff.h>
#include <gnuradio/blocks/nlog10_ff.h>
#include "scanner_sink.hpp"
class TopBlock : public gr::top_block
{
public:
TopBlock(double centre_freq_1, double centre_freq_2, double sample_rate,
double fft_width, double bandwidth1, double bandwidth2,
double step, unsigned int avg_size, double spread,
double threshold, double ptime, const std::string &outcsv) :
gr::top_block("Top Block"),
vector_length(sample_rate / fft_width),
window(GetWindow(vector_length)),
source(osmosdr::source::make()), /* OsmoSDR Source */
stv(gr::blocks::stream_to_vector::make(sizeof(float) * 2, vector_length)), /* Stream to vector */
/* Based on the logpwrfft (a block implemented in python) */
fft(gr::fft::fft_vcc::make(vector_length, true, window, false, 1)),
ctf(gr::blocks::complex_to_mag_squared::make(vector_length)),
iir(gr::filter::single_pole_iir_filter_ff::make(1.0, vector_length)),
lg(gr::blocks::nlog10_ff::make(10, vector_length, -20 * std::log10(float(vector_length)) -10 * std::log10(float(GetWindowPower() / vector_length)))),
/* Sink - this does most of the interesting work */
sink(make_scanner_sink(source, vector_length, centre_freq_1, centre_freq_2, sample_rate, bandwidth1, bandwidth2, step, avg_size, spread, threshold, ptime, outcsv))
{
/* Set up the OsmoSDR Source */
source->set_sample_rate(sample_rate);
source->set_center_freq(centre_freq_1);
source->set_freq_corr(0.0);
source->set_gain_mode(false);
source->set_gain(10.0);
source->set_if_gain(20.0);
/* Set up the connections */
connect(source, 0, stv, 0);
connect(stv, 0, fft, 0);
connect(fft, 0, ctf, 0);
connect(ctf, 0, iir, 0);
connect(iir, 0, lg, 0);
connect(lg, 0, sink, 0);
}
private:
/* http://en.wikipedia.org/w/index.php?title=Window_function&oldid=508445914 */
std::vector<float> GetWindow(size_t n)
{
std::vector<float> w;
w.resize(n);
double a = 0.16;
double a0 = (1.0 - a)/2.0;
double a1 = 0.5;
double a2 = a/2.0;
for (unsigned int i = 0; i < n; ++i)
w[i] = a0 - a1 * ::cos((2.0 * 3.14159 * static_cast<double>(i))/static_cast<double>(n - 1)) + a2 * ::cos((4.0 * 3.14159 * static_cast<double>(i))/static_cast<double>(n - 1));
return w;
}
double GetWindowPower()
{
double total = 0.0;
BOOST_FOREACH (double d, window)
total += d * d;
return total;
}
size_t vector_length;
std::vector<float> window;
osmosdr::source::sptr source;
gr::blocks::stream_to_vector::sptr stv;
gr::fft::fft_vcc::sptr fft;
gr::blocks::complex_to_mag_squared::sptr ctf;
gr::filter::single_pole_iir_filter_ff::sptr iir;
gr::blocks::nlog10_ff::sptr lg;
scanner_sink_sptr sink;
};
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