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os_cfar_2d_vc.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2014 Communications Engineering Lab, KIT.
4  *
5  * This is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 3, or (at your option)
8  * any later version.
9  *
10  * This software is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this software; see the file COPYING. If not, write to
17  * the Free Software Foundation, Inc., 51 Franklin Street,
18  * Boston, MA 02110-1301, USA.
19  */
20 
21 
22 #ifndef INCLUDED_RADAR_OS_CFAR_2D_VC_H
23 #define INCLUDED_RADAR_OS_CFAR_2D_VC_H
24 
25 #include <radar/api.h>
26 #include <gnuradio/tagged_stream_block.h>
27 
28 namespace gr {
29  namespace radar {
30 
31  /*!
32  * \brief This block estimates peaks of a given matrix. A matrix can be represented as a combination of vectors and tagged streams. Input has to be a matrix with linear scaled values (NOT logarithmic scaled!). Used algorithm is a 2D OS-CFAR algorithm. The algorithm uses around the cell under test (CUT) on each side samp_compare samples to estimate the noise floor. samp_protect is a protected are around the CUT which is not used for acquiring compare samples. Index 0 of a input vector refers to x axis properties and index 1 refers to y axis properties. The relative threshold is defined by the bin of the vector within the sorted samp_compare samples. A standard value is rel_threshold = 0.78. The value of this bin is multiplied by mult_threshold and compared with the CUT. If the magnitude square of the CUT is greater than the threshold the matrix item is accepted. Used identifiers (symbols) for data are 'axis_x', 'axis_y' and 'power'.
33  *
34  * \param vlen Input vector length
35  * \param samp_compare Compare samples (vector index refers to axis)
36  * \param samp_protect Protected samples (vector index refers to axis)
37  * \param rel_threshold Relative threshold
38  * \param mult_threshold Multiplier threshold
39  * \param len_key Packet length key for tagged stream
40  *
41  * \ingroup radar
42  *
43  */
44  class RADAR_API os_cfar_2d_vc : virtual public gr::tagged_stream_block
45  {
46  public:
47  typedef boost::shared_ptr<os_cfar_2d_vc> sptr;
48 
49  /*!
50  * \brief Return a shared_ptr to a new instance of radar::os_cfar_2d_vc.
51  *
52  * To avoid accidental use of raw pointers, radar::os_cfar_2d_vc's
53  * constructor is in a private implementation
54  * class. radar::os_cfar_2d_vc::make is the public interface for
55  * creating new instances.
56  */
57  static sptr make(int vlen, std::vector<int> samp_compare, std::vector<int> samp_protect, float rel_threshold, float mult_threshold, const std::string& len_key="packet_len");
58  virtual void set_rel_threshold(float inp) = 0;
59  virtual void set_mult_threshold(float inp) = 0;
60  virtual void set_samp_compare(std::vector<int> inp) = 0;
61  virtual void set_samp_protect(std::vector<int> inp) = 0;
62  };
63 
64  } // namespace radar
65 } // namespace gr
66 
67 #endif /* INCLUDED_RADAR_OS_CFAR_2D_VC_H */
68 
boost::shared_ptr< os_cfar_2d_vc > sptr
Definition: os_cfar_2d_vc.h:47
This block estimates peaks of a given matrix. A matrix can be represented as a combination of vectors...
Definition: os_cfar_2d_vc.h:44
#define RADAR_API
Definition: api.h:30