Initial import20160104

1 files changed, 104 insertions, 0 deletions

diff --git a/topblock.hpp b/topblock.hpp
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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;
+};