Add Galileo E6 signal structure based on E6-B/C Codes Technical Note, Issue 1, Jan 2019.

Add Acquisition, Tracking and TLM blocks for Galileo E6 B/C. The decoder does nothing

src/algorithms/tracking/adapters/CMakeLists.txt

@@ -44,6 +44,7 @@ set(TRACKING_ADAPTER_SOURCES
     gps_l1_ca_tcp_connector_tracking.cc
     galileo_e5a_dll_pll_tracking.cc
     galileo_e5b_dll_pll_tracking.cc
+    galileo_e6_dll_pll_tracking.cc
     gps_l2_m_dll_pll_tracking.cc
     glonass_l1_ca_dll_pll_tracking.cc
     glonass_l1_ca_dll_pll_c_aid_tracking.cc
@@ -63,6 +64,7 @@ set(TRACKING_ADAPTER_HEADERS
     gps_l1_ca_tcp_connector_tracking.h
     galileo_e5a_dll_pll_tracking.h
     galileo_e5b_dll_pll_tracking.h
+    galileo_e6_dll_pll_tracking.h
     gps_l2_m_dll_pll_tracking.h
     glonass_l1_ca_dll_pll_tracking.h
     glonass_l1_ca_dll_pll_c_aid_tracking.h

src/algorithms/tracking/adapters/galileo_e6_dll_pll_tracking.cc

@@ -0,0 +1,140 @@
+/*!
+ * \file galileo_e6_dll_pll_tracking.cc
+ * \brief Adapts a code DLL + carrier PLL
+ *  tracking block to a TrackingInterface for Galileo E6 signals
+ * \author Carles Fernandez-Prades, 2020. cfernandez(at)cttc.es
+ *
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Copyright (C) 2010-2020  (see AUTHORS file for a list of contributors)
+ *
+ * GNSS-SDR is a software defined Global Navigation
+ *          Satellite Systems receiver
+ *
+ * This file is part of GNSS-SDR.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+#include "galileo_e6_dll_pll_tracking.h"
+#include "Galileo_E6.h"
+#include "configuration_interface.h"
+#include "display.h"
+#include "dll_pll_conf.h"
+#include "gnss_sdr_flags.h"
+#include <glog/logging.h>
+#include <array>
+
+GalileoE6DllPllTracking::GalileoE6DllPllTracking(
+    const ConfigurationInterface* configuration, const std::string& role,
+    unsigned int in_streams, unsigned int out_streams) : role_(role), in_streams_(in_streams), out_streams_(out_streams)
+{
+    Dll_Pll_Conf trk_params = Dll_Pll_Conf();
+    DLOG(INFO) << "role " << role;
+    trk_params.SetFromConfiguration(configuration, role);
+
+    const auto vector_length = static_cast<int>(std::round(trk_params.fs_in / (GALILEO_E6_B_CODE_CHIP_RATE_CPS / GALILEO_E6_B_CODE_LENGTH_CHIPS)));
+    trk_params.vector_length = vector_length;
+    if (trk_params.extend_correlation_symbols < 1)
+        {
+            trk_params.extend_correlation_symbols = 1;
+            std::cout << TEXT_RED << "WARNING: Galileo E6. extend_correlation_symbols must be bigger than 0. Coherent integration has been set to 1 symbol (1 ms)" << TEXT_RESET << '\n';
+        }
+    else if (!trk_params.track_pilot and trk_params.extend_correlation_symbols > 1)
+        {
+            trk_params.extend_correlation_symbols = 1;
+            std::cout << TEXT_RED << "WARNING: Galileo E6. Extended coherent integration is not allowed when tracking the data component. Coherent integration has been set to 1 ms (1 symbol)" << TEXT_RESET << '\n';
+        }
+    if ((trk_params.extend_correlation_symbols > 1) and (trk_params.pll_bw_narrow_hz > trk_params.pll_bw_hz or trk_params.dll_bw_narrow_hz > trk_params.dll_bw_hz))
+        {
+            std::cout << TEXT_RED << "WARNING: Galileo E5b. PLL or DLL narrow tracking bandwidth is higher than wide tracking one" << TEXT_RESET << '\n';
+        }
+    trk_params.system = 'E';
+    const std::array<char, 3> sig_{'E', '6', '\0'};
+    std::memcpy(trk_params.signal, sig_.data(), 3);
+
+    // ################# Make a GNU Radio Tracking block object ################
+    if (trk_params.item_type == "gr_complex")
+        {
+            item_size_ = sizeof(gr_complex);
+            tracking_ = dll_pll_veml_make_tracking(trk_params);
+        }
+    else
+        {
+            item_size_ = sizeof(gr_complex);
+            LOG(WARNING) << trk_params.item_type << " unknown tracking item type.";
+        }
+    channel_ = 0;
+    DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
+    if (in_streams_ > 1)
+        {
+            LOG(ERROR) << "This implementation only supports one input stream";
+        }
+    if (out_streams_ > 1)
+        {
+            LOG(ERROR) << "This implementation only supports one output stream";
+        }
+}
+
+
+void GalileoE6DllPllTracking::stop_tracking()
+{
+    tracking_->stop_tracking();
+}
+
+
+void GalileoE6DllPllTracking::start_tracking()
+{
+    tracking_->start_tracking();
+}
+
+
+/*
+ * Set tracking channel unique ID
+ */
+void GalileoE6DllPllTracking::set_channel(unsigned int channel)
+{
+    channel_ = channel;
+    tracking_->set_channel(channel);
+}
+
+
+void GalileoE6DllPllTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
+{
+    tracking_->set_gnss_synchro(p_gnss_synchro);
+}
+
+
+void GalileoE6DllPllTracking::connect(gr::top_block_sptr top_block)
+{
+    if (top_block)
+        {
+            /* top_block is not null */
+        };
+    // nothing to connect, now the tracking uses gr_sync_decimator
+}
+
+
+void GalileoE6DllPllTracking::disconnect(gr::top_block_sptr top_block)
+{
+    if (top_block)
+        {
+            /* top_block is not null */
+        };
+    // nothing to disconnect, now the tracking uses gr_sync_decimator
+}
+
+
+gr::basic_block_sptr GalileoE6DllPllTracking::get_left_block()
+{
+    return tracking_;
+}
+
+
+gr::basic_block_sptr GalileoE6DllPllTracking::get_right_block()
+{
+    return tracking_;
+}

src/algorithms/tracking/adapters/galileo_e6_dll_pll_tracking.h

@@ -0,0 +1,117 @@
+/*!
+ * \file galileo_e6_dll_pll_tracking.h
+ * \brief Adapts a code DLL + carrier PLL
+ *  tracking block to a TrackingInterface for Galileo E6 signals
+ * \author Carles Fernandez-Prades, 2020. cfernandez(at)cttc.es
+ *
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Copyright (C) 2010-2020  (see AUTHORS file for a list of contributors)
+ *
+ * GNSS-SDR is a software defined Global Navigation
+ *          Satellite Systems receiver
+ *
+ * This file is part of GNSS-SDR.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+#ifndef GNSS_SDR_GALILEO_E6_DLL_PLL_TRACKING_H
+#define GNSS_SDR_GALILEO_E6_DLL_PLL_TRACKING_H
+
+#include "dll_pll_veml_tracking.h"
+#include "tracking_interface.h"
+#include <string>
+
+/** \addtogroup Tracking
+ * \{ */
+/** \addtogroup Tracking_adapters
+ * \{ */
+
+
+class ConfigurationInterface;
+
+/*!
+ * \brief This class implements a code DLL + carrier PLL tracking loop
+ */
+class GalileoE6DllPllTracking : public TrackingInterface
+{
+public:
+    GalileoE6DllPllTracking(
+        const ConfigurationInterface* configuration,
+        const std::string& role,
+        unsigned int in_streams,
+        unsigned int out_streams);
+
+    ~GalileoE6DllPllTracking() = default;
+
+    inline std::string role() override
+    {
+        return role_;
+    }
+
+    //! Returns "Galileo_E6_DLL_PLL_Tracking"
+    inline std::string implementation() override
+    {
+        return "Galileo_E6_DLL_PLL_Tracking";
+    }
+
+    inline size_t item_size() override
+    {
+        return item_size_;
+    }
+
+    /*!
+     * \brief Connect
+     */
+    void connect(gr::top_block_sptr top_block) override;
+
+    /*!
+     * \brief Disconnect
+     */
+    void disconnect(gr::top_block_sptr top_block) override;
+
+    /*!
+     * \brief Get left block
+     */
+    gr::basic_block_sptr get_left_block() override;
+
+    /*!
+     * \brief Get right block
+     */
+    gr::basic_block_sptr get_right_block() override;
+
+    /*!
+     * \brief Set tracking channel unique ID
+     */
+    void set_channel(unsigned int channel) override;
+
+    /*!
+     * \brief Set acquisition/tracking common Gnss_Synchro object pointer
+     * to efficiently exchange synchronization data between acquisition and tracking blocks
+     */
+    void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro) override;
+
+    void start_tracking() override;
+
+    /*!
+     * \brief Stop running tracking
+     */
+    void stop_tracking() override;
+
+private:
+    dll_pll_veml_tracking_sptr tracking_;
+    size_t item_size_;
+    unsigned int channel_;
+    std::string role_;
+    unsigned int in_streams_;
+    unsigned int out_streams_;
+};
+
+
+/** \} */
+/** \} */
+#endif  // GNSS_SDR_GALILEO_E6_DLL_PLL_TRACKING_H