Retrieve reduced CED only once, don't do it if we already have the full ephemeris set

Update changelog

docs/CHANGELOG.md

@@ -22,15 +22,18 @@ All notable changes to GNSS-SDR will be documented in this file.
 
 ### Improvements in Interoperability:
 
-- Fix setting of the signal source gain if the AGC is enabled when using the
+- Fixed setting of the signal source gain if the AGC is enabled when using the
   AD9361 front-end.
+- Fixed the regeneration of Galileo ephemeris from the reduced clock and
+  ephemeris data (CED) defined in the Galileo E1B INAV message introduced in
+  Galileo OS SIS ICD Issue 2.0.
 
 ### Improvements in Maintainability:
 
 - Rewritten Viterbi decoder for Galileo navigation messages: encapsulated in a
   class instead of being implemented as free inline functions. This improves
   memory management.
-- Update GSL implementation to v0.39.0. See
+- Updated GSL implementation to v0.39.0. See
   https://github.com/gsl-lite/gsl-lite/releases/tag/v0.39.0
 
 ### Improvements in Reliability

src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc

@@ -85,6 +85,7 @@ galileo_telemetry_decoder_gs::galileo_telemetry_decoder_gs(
     d_remove_dat = conf.remove_dat;
     d_satellite = Gnss_Satellite(satellite.get_system(), satellite.get_PRN());
     d_frame_type = frame_type;
+    d_enable_reed_solomon_inav = false;
 
     // Viterbi decoder vars
     const int32_t nn = 2;                               // Coding rate 1/n
@@ -123,6 +124,7 @@ galileo_telemetry_decoder_gs::galileo_telemetry_decoder_gs(
                 d_max_symbols_without_valid_frame = GALILEO_INAV_PAGE_SYMBOLS * 30;  // rise alarm 60 seconds without valid tlm
                 if (conf.enable_reed_solomon == true)
                     {
+                        d_enable_reed_solomon_inav = true;
                         d_inav_nav.enable_reed_solomon();
                     }
                 break;
@@ -609,6 +611,10 @@ void galileo_telemetry_decoder_gs::reset()
     d_sent_tlm_failed_msg = false;
     d_stat = 0;
     d_viterbi->reset();
+    if (d_enable_reed_solomon_inav == true)
+        {
+            d_inav_nav.enable_reed_solomon();
+        }
     DLOG(INFO) << "Telemetry decoder reset for satellite " << d_satellite;
 }
 

src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.h

@@ -143,6 +143,7 @@ private:
     bool d_print_cnav_page;
     bool d_enable_navdata_monitor;
     bool d_dump_crc_stats;
+    bool d_enable_reed_solomon_inav;
 };
 
 

src/core/system_parameters/galileo_inav_message.cc

@@ -248,6 +248,7 @@ bool Galileo_Inav_Message::have_new_ephemeris()  // Check if we have a new ephem
                     flag_ephemeris_4 = false;  // clear the flag
                     flag_all_ephemeris = true;
                     IOD_ephemeris = IOD_nav_1;
+                    enable_rs = false;  // Do not retrieve reduced CED if we already have the full ephemeris set
                     DLOG(INFO) << "Batch number: " << IOD_ephemeris;
                     return true;
                 }
@@ -357,6 +358,7 @@ bool Galileo_Inav_Message::have_new_ephemeris()  // Check if we have a new ephem
                             flag_ephemeris_4 = false;  // clear the flag
                             flag_all_ephemeris = true;
                             IOD_ephemeris = IOD_nav_1;
+                            enable_rs = false;  // Retrieve reduced CED only once
                             DLOG(INFO) << "Batch number: " << IOD_ephemeris;
                             return true;
                         }