Merge branch 'piyush0411-Processing_Files' into next

src/algorithms/libs/galileo_e5_signal_processing.cc

@@ -3,11 +3,13 @@
  * \brief This library implements various functions for Galileo E5 signals such
  * as replica code generation
  * \author Marc Sales, 2014. marcsales92(at)gmail.com
+ * \author Piyush Gupta, 2020. piyush04111999@gmail.com
+ * \note Code added as part of GSoc 2020 Program.
  *
  *
  * -------------------------------------------------------------------------
  *
- * Copyright (C) 2010-2019  (see AUTHORS file for a list of contributors)
+ * Copyright (C) 2010-2020  (see AUTHORS file for a list of contributors)
  *
  * GNSS-SDR is a software defined Global Navigation
  *          Satellite Systems receiver
@@ -21,6 +23,7 @@
 
 #include "galileo_e5_signal_processing.h"
 #include "Galileo_E5a.h"
+#include "Galileo_E5b.h"
 #include "gnss_signal_processing.h"
 #include <gnuradio/gr_complex.h>
 #include <memory>
@@ -123,3 +126,100 @@ void galileo_e5_a_code_gen_complex_sampled(own::span<std::complex<float>> _dest,
             _dest[(i + delay) % _samplesPerCode] = _code[i];
         }
 }
+
+
+void galileo_e5_b_code_gen_complex_primary(own::span<std::complex<float>> _dest,
+    int32_t _prn,
+    const std::array<char, 3>& _Signal)
+{
+    uint32_t prn = _prn - 1;
+    uint32_t index = 0;
+    std::array<int32_t, 4> a{};
+    if ((_prn < 1) || (_prn > 50))
+        {
+            return;
+        }
+    if (_Signal[0] == '7' && _Signal[1] == 'Q')
+        {
+            for (size_t i = 0; i < GALILEO_E5B_Q_PRIMARY_CODE[prn].length() - 1; i++)
+                {
+                    hex_to_binary_converter(a, GALILEO_E5B_Q_PRIMARY_CODE[prn][i]);
+                    _dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
+                    _dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
+                    _dest[index + 2] = std::complex<float>(static_cast<float>(a[2]), 0.0);
+                    _dest[index + 3] = std::complex<float>(static_cast<float>(a[3]), 0.0);
+                    index = index + 4;
+                }
+            // last 2 bits are filled up zeros
+            hex_to_binary_converter(a, GALILEO_E5B_Q_PRIMARY_CODE[prn][GALILEO_E5B_Q_PRIMARY_CODE[prn].length() - 1]);
+            _dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
+            _dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
+        }
+    else if (_Signal[0] == '7' && _Signal[1] == 'I')
+        {
+            for (size_t i = 0; i < GALILEO_E5B_I_PRIMARY_CODE[prn].length() - 1; i++)
+                {
+                    hex_to_binary_converter(a, GALILEO_E5B_I_PRIMARY_CODE[prn][i]);
+                    _dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
+                    _dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
+                    _dest[index + 2] = std::complex<float>(static_cast<float>(a[2]), 0.0);
+                    _dest[index + 3] = std::complex<float>(static_cast<float>(a[3]), 0.0);
+                    index = index + 4;
+                }
+            // last 2 bits are filled up zeros
+            hex_to_binary_converter(a, GALILEO_E5B_I_PRIMARY_CODE[prn][GALILEO_E5B_I_PRIMARY_CODE[prn].length() - 1]);
+            _dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
+            _dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
+        }
+    else if (_Signal[0] == '7' && _Signal[1] == 'X')
+        {
+            std::array<int32_t, 4> b{};
+            for (size_t i = 0; i < GALILEO_E5B_I_PRIMARY_CODE[prn].length() - 1; i++)
+                {
+                    hex_to_binary_converter(a, GALILEO_E5B_I_PRIMARY_CODE[prn][i]);
+                    hex_to_binary_converter(b, GALILEO_E5B_Q_PRIMARY_CODE[prn][i]);
+                    _dest[index] = std::complex<float>(static_cast<float>(a[0]), static_cast<float>(b[0]));
+                    _dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), static_cast<float>(b[1]));
+                    _dest[index + 2] = std::complex<float>(static_cast<float>(a[2]), static_cast<float>(b[2]));
+                    _dest[index + 3] = std::complex<float>(static_cast<float>(a[3]), static_cast<float>(b[3]));
+                    index = index + 4;
+                }
+            // last 2 bits are filled up zeros
+            hex_to_binary_converter(a, GALILEO_E5B_I_PRIMARY_CODE[prn][GALILEO_E5B_I_PRIMARY_CODE[prn].length() - 1]);
+            hex_to_binary_converter(b, GALILEO_E5B_Q_PRIMARY_CODE[prn][GALILEO_E5B_Q_PRIMARY_CODE[prn].length() - 1]);
+            _dest[index] = std::complex<float>(static_cast<float>(a[0]), static_cast<float>(b[0]));
+            _dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), static_cast<float>(b[1]));
+        }
+}
+
+
+void galileo_e5_b_code_gen_complex_sampled(own::span<std::complex<float>> _dest,
+    uint32_t _prn,
+    const std::array<char, 3>& _Signal,
+    int32_t _fs,
+    uint32_t _chip_shift)
+{
+    uint32_t _samplesPerCode;
+    uint32_t delay;
+    const uint32_t _codeLength = GALILEO_E5B_CODE_LENGTH_CHIPS;
+    const int32_t _codeFreqBasis = GALILEO_E5B_CODE_CHIP_RATE_CPS;
+
+    std::vector<std::complex<float>> _code(_codeLength);
+    galileo_e5_b_code_gen_complex_primary(_code, _prn, _Signal);
+
+    _samplesPerCode = static_cast<uint32_t>(static_cast<double>(_fs) / (static_cast<double>(_codeFreqBasis) / static_cast<double>(_codeLength)));
+
+    delay = ((_codeLength - _chip_shift) % _codeLength) * _samplesPerCode / _codeLength;
+
+    if (_fs != _codeFreqBasis)
+        {
+            std::vector<std::complex<float>> _resampled_signal(_samplesPerCode);
+            resampler(_code, _resampled_signal, _codeFreqBasis, _fs);  // resamples code to fs
+            _code = std::move(_resampled_signal);
+        }
+
+    for (uint32_t i = 0; i < _samplesPerCode; i++)
+        {
+            _dest[(i + delay) % _samplesPerCode] = _code[i];
+        }
+}

src/algorithms/libs/galileo_e5_signal_processing.h

@@ -3,11 +3,13 @@
  * \brief This library implements various functions for Galileo E5 signals such
  * as replica code generation
  * \author Marc Sales, 2014. marcsales92(at)gmail.com
+ * \author Piyush Gupta, 2020. piyush04111999@gmail.com
+ * \note Code added as part of GSoC 2020 Program.
  *
  *
  * -------------------------------------------------------------------------
  *
- * Copyright (C) 2010-2019  (see AUTHORS file for a list of contributors)
+ * Copyright (C) 2010-2020  (see AUTHORS file for a list of contributors)
  *
  * GNSS-SDR is a software defined Global Navigation
  *          Satellite Systems receiver
@@ -52,4 +54,22 @@ void galileo_e5_a_code_gen_complex_sampled(own::span<std::complex<float>> _dest,
     uint32_t _chip_shift);
 
 
+/*!
+ * \brief Generates Galileo E5b code at 1 sample/chip
+ */
+void galileo_e5_b_code_gen_complex_primary(own::span<std::complex<float>> _dest,
+    int32_t _prn,
+    const std::array<char, 3>& _Signal);
+
+
+/*!
+ * \brief Generates Galileo E5b complex code, shifted to the desired chip and
+ * sampled at a frequency fs
+ */
+void galileo_e5_b_code_gen_complex_sampled(own::span<std::complex<float>> _dest,
+    uint32_t _prn,
+    const std::array<char, 3>& _Signal,
+    int32_t _fs,
+    uint32_t _chip_shift);
+
 #endif  // GNSS_SDR_GALILEO_E5_SIGNAL_PROCESSING_H