Create doppler shift correction block
This commit is contained in:
parent
4e1be5ee44
commit
e242624312
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@ -28,5 +28,6 @@ install(FILES
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satnogs_ax25_decoder_b.xml
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satnogs_udp_msg_source.xml
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satnogs_debug_msg_source.xml
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satnogs_tcp_rigctl_msg_source.xml DESTINATION share/gnuradio/grc/blocks
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satnogs_tcp_rigctl_msg_source.xml
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satnogs_doppler_correction_cc.xml DESTINATION share/gnuradio/grc/blocks
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)
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@ -0,0 +1,38 @@
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<?xml version="1.0"?>
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<block>
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<name>doppler_correction_cc</name>
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<key>satnogs_doppler_correction_cc</key>
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<category>satnogs</category>
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<import>import satnogs</import>
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<make>satnogs.doppler_correction_cc($target_freq)</make>
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<!-- Make one 'param' node for every Parameter you want settable from the GUI.
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Sub-nodes:
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* name
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* key (makes the value accessible as $keyname, e.g. in the make node)
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* type -->
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<param>
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<name>...</name>
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<key>...</key>
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<type>...</type>
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</param>
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<!-- Make one 'sink' node per input. Sub-nodes:
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* name (an identifier for the GUI)
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* type
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* vlen
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* optional (set to 1 for optional inputs) -->
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<sink>
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<name>in</name>
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<type><!-- e.g. int, float, complex, byte, short, xxx_vector, ...--></type>
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</sink>
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<!-- Make one 'source' node per output. Sub-nodes:
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* name (an identifier for the GUI)
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* type
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* vlen
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* optional (set to 1 for optional inputs) -->
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<source>
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<name>out</name>
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<type><!-- e.g. int, float, complex, byte, short, xxx_vector, ...--></type>
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</source>
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</block>
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@ -40,5 +40,6 @@ install(FILES
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udp_msg_source.h
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debug_msg_source.h
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tc_tm.h
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tcp_rigctl_msg_source.h DESTINATION include/satnogs
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tcp_rigctl_msg_source.h
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doppler_correction_cc.h DESTINATION include/satnogs
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)
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@ -0,0 +1,66 @@
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/* -*- 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_DOPPLER_CORRECTION_CC_H
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#define INCLUDED_SATNOGS_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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{
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namespace satnogs
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{
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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. It takes the imput stream in baseband
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* and applies proper corrections to keep the carrier at the desired
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* frequency. To achieve that it uses messages containing the absolute
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* predicted frequency of the satellite from software like Gpredict.
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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 doppler_correction_cc : virtual public gr::sync_block
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{
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public:
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typedef boost::shared_ptr<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. The message input \p freq
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* received periodically messages containing the predicted absolute
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* frequency of the satellite at the moment of the
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* @param target_freq the absolute frequency of the satellite
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* @param sampling_rate the sampling rate of the signal
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* @param corrections_per_sec the number of the corrections every second
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* that the block should perform
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*/
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static sptr
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make (double target_freq, double sampling_rate,
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size_t corrections_per_sec = 1000);
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};
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} // namespace satnogs
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} // namespace gr
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#endif /* INCLUDED_SATNOGS_DOPPLER_CORRECTION_CC_H */
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@ -37,7 +37,8 @@ list(APPEND satnogs_sources
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ax25_decoder_b_impl.cc
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udp_msg_source_impl.cc
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debug_msg_source_impl.cc
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tcp_rigctl_msg_source_impl.cc )
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tcp_rigctl_msg_source_impl.cc
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doppler_correction_cc_impl.cc )
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set(satnogs_sources "${satnogs_sources}" PARENT_SCOPE)
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if(NOT satnogs_sources)
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@ -0,0 +1,84 @@
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/* -*- 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include "doppler_correction_cc_impl.h"
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namespace gr
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{
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namespace satnogs
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{
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doppler_correction_cc::sptr
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doppler_correction_cc::make (double target_freq, double sampling_rate,
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size_t corrections_per_sec)
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{
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return gnuradio::get_initial_sptr (
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new doppler_correction_cc_impl (target_freq, sampling_rate,
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corrections_per_sec));
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}
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/*
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* The private constructor
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*/
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doppler_correction_cc_impl::doppler_correction_cc_impl (
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double target_freq, double sampling_rate, size_t corrections_per_sec) :
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gr::sync_block ("doppler_correction_cc",
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gr::io_signature::make (1, 1, sizeof(gr_complex)),
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gr::io_signature::make (1, 1, sizeof(gr_complex))),
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d_target_freq (target_freq),
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d_samp_rate (sampling_rate),
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d_update_period (sampling_rate / (double) corrections_per_sec),
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d_freq_diff (0.0)
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{
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message_port_register_in (pmt::mp ("freq"));
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/*
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* Set the maximum number of samples to be equivalent of half a second.
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* With this way we are sure that at least one frequency message
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* per second will be processed.
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*/
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set_max_noutput_items (d_samp_rate / 2.0);
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}
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/*
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* Our virtual destructor.
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*/
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doppler_correction_cc_impl::~doppler_correction_cc_impl ()
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{
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}
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int
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doppler_correction_cc_impl::work (int noutput_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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{
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const gr_complex *in = (const gr_complex *) input_items[0];
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gr_complex *out = (gr_complex *) output_items[0];
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return noutput_items;
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}
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} /* namespace satnogs */
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} /* namespace gr */
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@ -0,0 +1,55 @@
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/* -*- 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_DOPPLER_CORRECTION_CC_IMPL_H
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#define INCLUDED_SATNOGS_DOPPLER_CORRECTION_CC_IMPL_H
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#include <satnogs/doppler_correction_cc.h>
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namespace gr
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{
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namespace satnogs
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{
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class doppler_correction_cc_impl : public doppler_correction_cc
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{
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private:
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const double d_target_freq;
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const double d_samp_rate;
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const double d_update_period;
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double d_freq_diff;
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public:
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doppler_correction_cc_impl (double target_freq, double sampling_rate,
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size_t corrections_per_sec);
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~doppler_correction_cc_impl ();
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// Where all the action really happens
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int
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work (int noutput_items, gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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};
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} // namespace satnogs
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} // namespace gr
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#endif /* INCLUDED_SATNOGS_DOPPLER_CORRECTION_CC_IMPL_H */
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@ -22,6 +22,7 @@
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#include "satnogs/udp_msg_source.h"
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#include "satnogs/debug_msg_source.h"
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#include "satnogs/tcp_rigctl_msg_source.h"
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#include "satnogs/doppler_correction_cc.h"
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%}
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@ -50,3 +51,5 @@ GR_SWIG_BLOCK_MAGIC2(satnogs, udp_msg_source);
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GR_SWIG_BLOCK_MAGIC2(satnogs, debug_msg_source);
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%include "satnogs/tcp_rigctl_msg_source.h"
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GR_SWIG_BLOCK_MAGIC2(satnogs, tcp_rigctl_msg_source);
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%include "satnogs/doppler_correction_cc.h"
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GR_SWIG_BLOCK_MAGIC2(satnogs, doppler_correction_cc);
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