GNU Radio's SATNOGS Package
doppler_correction_cc.h
Go to the documentation of this file.
1 /* -*- c++ -*- */
2 /*
3  * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
4  *
5  * Copyright (C) 2016,2019 Libre Space Foundation <http://libre.space>
6  *
7  * This program is free software: you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation, either version 3 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program. If not, see <http://www.gnu.org/licenses/>.
19  */
20 
21 #ifndef INCLUDED_SATNOGS_DOPPLER_CORRECTION_CC_H
22 #define INCLUDED_SATNOGS_DOPPLER_CORRECTION_CC_H
23 
24 #include <satnogs/api.h>
25 #include <gnuradio/sync_block.h>
26 
27 namespace gr {
28 namespace satnogs {
29 
30 /*!
31  * \brief This block corrects the doppler effect between the ground
32  * station and the satellite. It takes the input stream in baseband
33  * and applies proper corrections to keep the carrier at the desired
34  * frequency. To achieve that it uses messages containing the absolute
35  * predicted frequency of the satellite from software like Gpredict.
36  *
37  * \ingroup satnogs
38  *
39  */
40 class SATNOGS_API doppler_correction_cc : virtual public gr::sync_block {
41 public:
42  typedef boost::shared_ptr<doppler_correction_cc> sptr;
43 
44  /*!
45  * The doppler correction block. The input is the complex signal at
46  * baseband as it comes from the SDR device. The message input \p freq
47  * received periodically messages containing the predicted absolute
48  * frequency of the satellite at that specific time.
49  * @param target_freq the absolute frequency of the satellite
50  * @param offset the frequency offset from the actual target frequency.
51  * This is very common on SDR receivers to avoid DC spikes at the center
52  * frequency. This block can automatically compensate this offset
53  * @param sampling_rate the sampling rate of the signal
54  * @param corrections_per_sec the number of the corrections every second
55  * that the block should perform
56  */
57  static sptr
58  make(double target_freq, double offset, double sampling_rate,
59  size_t corrections_per_sec = 1000);
60 };
61 
62 } // namespace satnogs
63 } // namespace gr
64 
65 #endif /* INCLUDED_SATNOGS_DOPPLER_CORRECTION_CC_H */
66 
#define SATNOGS_API
Definition: api.h:30
This block corrects the doppler effect between the ground station and the satellite....
Definition: doppler_correction_cc.h:40
boost::shared_ptr< doppler_correction_cc > sptr
Definition: doppler_correction_cc.h:42
static sptr make(double target_freq, double offset, double sampling_rate, size_t corrections_per_sec=1000)
Definition: amsat_duv_decoder.h:29