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Diffstat (limited to 'topblock.hpp')
| -rw-r--r-- | topblock.hpp | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/topblock.hpp b/topblock.hpp new file mode 100644 index 0000000..33e9484 --- /dev/null +++ b/topblock.hpp @@ -0,0 +1,104 @@ +/* + 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; +}; |