Improve data types for GPS navigation messages

src/core/libs/gnss_sdr_supl_client.cc

@@ -220,12 +220,12 @@ void gnss_sdr_supl_client::read_supl_data()
         {
             gps_utc.d_A0 = static_cast<double>(assist.utc.a0) * pow(2.0, -30);
             gps_utc.d_A1 = static_cast<double>(assist.utc.a1) * pow(2.0, -50);
-            gps_utc.d_DeltaT_LS = static_cast<double>(assist.utc.delta_tls);
+            gps_utc.d_DeltaT_LS = static_cast<int32_t>(assist.utc.delta_tls);
-            gps_utc.d_DeltaT_LSF = static_cast<double>(assist.utc.delta_tlsf);
+            gps_utc.d_DeltaT_LSF = static_cast<int32_t>(assist.utc.delta_tlsf);
-            gps_utc.d_t_OT = static_cast<double>(assist.utc.tot) * pow(2.0, 12);
+            gps_utc.d_t_OT = static_cast<int32_t>(assist.utc.tot) * pow(2.0, 12);
-            gps_utc.i_DN = static_cast<double>(assist.utc.dn);
+            gps_utc.i_DN = static_cast<int32_t>(assist.utc.dn);
-            gps_utc.i_WN_T = static_cast<double>(assist.utc.wnt);
+            gps_utc.i_WN_T = static_cast<int32_t>(assist.utc.wnt);
-            gps_utc.i_WN_LSF = static_cast<double>(assist.utc.wnlsf);
+            gps_utc.i_WN_LSF = static_cast<int32_t>(assist.utc.wnlsf);
             gps_utc.valid = true;
         }
 
@@ -268,7 +268,7 @@ void gnss_sdr_supl_client::read_supl_data()
                     gps_almanac_iterator->second.d_OMEGA0 = static_cast<double>(a->OMEGA_0) * pow(2.0, -23);
                     gps_almanac_iterator->second.d_sqrt_A = static_cast<double>(a->A_sqrt) * pow(2.0, -11);
                     gps_almanac_iterator->second.d_OMEGA_DOT = static_cast<double>(a->OMEGA_dot) * pow(2.0, -38);
-                    gps_almanac_iterator->second.i_Toa = static_cast<int32_t>(a->toa) * pow(2.0, 12);
+                    gps_almanac_iterator->second.i_Toa = static_cast<int32_t>(a->toa * pow(2.0, 12));
                     gps_almanac_iterator->second.d_e_eccentricity = static_cast<double>(a->e) * pow(2.0, -21);
                     gps_almanac_iterator->second.d_M_0 = static_cast<double>(a->M0) * pow(2.0, -23);
                 }

src/core/system_parameters/GPS_CNAV.h

@@ -54,7 +54,7 @@ const int32_t GPS_CNAV_DATA_PAGE_BITS = 300;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_PRN({{9, 6}});
 const std::vector<std::pair<int32_t, int32_t> > CNAV_MSG_TYPE({{15, 6}});
 const std::vector<std::pair<int32_t, int32_t> > CNAV_TOW({{21, 17}});  // GPS Time Of Week in seconds
-const double CNAV_TOW_LSB = 6.0;
+const int32_t CNAV_TOW_LSB = 6;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_ALERT_FLAG({{38, 1}});
 
 // MESSAGE TYPE 10 (Ephemeris 1)
@@ -62,11 +62,11 @@ const std::vector<std::pair<int32_t, int32_t> > CNAV_ALERT_FLAG({{38, 1}});
 const std::vector<std::pair<int32_t, int32_t> > CNAV_WN({{39, 13}});
 const std::vector<std::pair<int32_t, int32_t> > CNAV_HEALTH({{52, 3}});
 const std::vector<std::pair<int32_t, int32_t> > CNAV_TOP1({{55, 11}});
-const double CNAV_TOP1_LSB = 300.0;
+const int32_t CNAV_TOP1_LSB = 300;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_URA({{66, 5}});
 
 const std::vector<std::pair<int32_t, int32_t> > CNAV_TOE1({{71, 11}});
-const double CNAV_TOE1_LSB = 300.0;
+const int32_t CNAV_TOE1_LSB = 300;
 
 const std::vector<std::pair<int32_t, int32_t> > CNAV_DELTA_A({{82, 26}});  // Relative to AREF = 26,559,710 meters
 const double CNAV_DELTA_A_LSB = TWO_N9;
@@ -90,7 +90,7 @@ const std::vector<std::pair<int32_t, int32_t> > CNAV_L2_PHASING_FLAG({{273, 1}})
 // MESSAGE TYPE 11 (Ephemeris 2)
 
 const std::vector<std::pair<int32_t, int32_t> > CNAV_TOE2({{39, 11}});
-const double CNAV_TOE2_LSB = 300.0;
+const int32_t CNAV_TOE2_LSB = 300;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_OMEGA0({{50, 33}});
 const double CNAV_OMEGA0_LSB = TWO_N32 * PI;  // semi-circles to radians
 const std::vector<std::pair<int32_t, int32_t> > CNAV_I0({{83, 33}});
@@ -116,12 +116,12 @@ const double CNAV_CUC_LSB = TWO_N30;
 // MESSAGE TYPE 30 (CLOCK, IONO, GRUP DELAY)
 
 const std::vector<std::pair<int32_t, int32_t> > CNAV_TOP2({{39, 11}});
-const double CNAV_TOP2_LSB = 300.0;
+const int32_t CNAV_TOP2_LSB = 300;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_URA_NED0({{50, 5}});
 const std::vector<std::pair<int32_t, int32_t> > CNAV_URA_NED1({{55, 3}});
 const std::vector<std::pair<int32_t, int32_t> > CNAV_URA_NED2({{58, 3}});
 const std::vector<std::pair<int32_t, int32_t> > CNAV_TOC({{61, 11}});
-const double CNAV_TOC_LSB = 300.0;
+const int32_t CNAV_TOC_LSB = 300;
 const std::vector<std::pair<int, int> > CNAV_AF0({{72, 26}});
 const double CNAV_AF0_LSB = TWO_N35;
 const std::vector<std::pair<int, int> > CNAV_AF1({{98, 20}});
@@ -167,9 +167,9 @@ const double CNAV_A1_LSB = TWO_N51;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_A2({{157, 7}});
 const double CNAV_A2_LSB = TWO_N68;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_DELTA_TLS({{164, 8}});
-const double CNAV_DELTA_TLS_LSB = 1;
+const int32_t CNAV_DELTA_TLS_LSB = 1;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_TOT({{172, 16}});
-const double CNAV_TOT_LSB = TWO_P4;
+const int32_t CNAV_TOT_LSB = TWO_P4;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_WN_OT({{188, 13}});
 const int32_t CNAV_WN_OT_LSB = 1;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_WN_LSF({{201, 13}});
@@ -177,7 +177,7 @@ const int32_t CNAV_WN_LSF_LSB = 1;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_DN({{214, 4}});
 const int32_t CNAV_DN_LSB = 1;
 const std::vector<std::pair<int32_t, int32_t> > CNAV_DELTA_TLSF({{218, 8}});
-const double CNAV_DELTA_TLSF_LSB = 1;
+const int32_t CNAV_DELTA_TLSF_LSB = 1;
 
 
 // TODO: Add more frames (Almanac, etc...)

src/core/system_parameters/GPS_L1_CA.h

@@ -118,7 +118,7 @@ const std::vector<std::pair<int32_t, int32_t>> T_GD({{197, 8}});
 const double T_GD_LSB = TWO_N31;
 const std::vector<std::pair<int32_t, int32_t>> IODC({{83, 2}, {211, 8}});
 const std::vector<std::pair<int32_t, int32_t>> T_OC({{219, 16}});
-const double T_OC_LSB = TWO_P4;
+const int32_t T_OC_LSB = static_cast<int32_t>(TWO_P4);
 const std::vector<std::pair<int32_t, int32_t>> A_F2({{241, 8}});
 const double A_F2_LSB = TWO_N55;
 const std::vector<std::pair<int32_t, int32_t>> A_F1({{249, 16}});
@@ -143,7 +143,7 @@ const double C_US_LSB = TWO_N29;
 const std::vector<std::pair<int32_t, int32_t>> SQRT_A({{227, 8}, {241, 24}});
 const double SQRT_A_LSB = TWO_N19;
 const std::vector<std::pair<int32_t, int32_t>> T_OE({{271, 16}});
-const double T_OE_LSB = TWO_P4;
+const int32_t T_OE_LSB = static_cast<int32_t>(TWO_P4);
 const std::vector<std::pair<int32_t, int32_t>> FIT_INTERVAL_FLAG({{271, 1}});
 const std::vector<std::pair<int32_t, int32_t>> AODO({{272, 5}});
 const int32_t AODO_LSB = 900;

src/core/system_parameters/galileo_fnav_message.cc

@@ -322,7 +322,7 @@ void Galileo_Fnav_Message::decode_page(const std::string& data)
             FNAV_A0_4 *= FNAV_A0_4_LSB;
             FNAV_A1_4 = static_cast<double>(read_navigation_signed(data_bits, FNAV_A1_4_bit));
             FNAV_A1_4 *= FNAV_A1_4_LSB;
-            FNAV_deltatls_4 = static_cast<double>(read_navigation_signed(data_bits, FNAV_deltatls_4_bit));
+            FNAV_deltatls_4 = static_cast<int32_t>(read_navigation_signed(data_bits, FNAV_deltatls_4_bit));
             FNAV_t0t_4 = static_cast<int32_t>(read_navigation_unsigned(data_bits, FNAV_t0t_4_bit));
             FNAV_t0t_4 *= FNAV_t0t_4_LSB;
             FNAV_WNot_4 = static_cast<int32_t>(read_navigation_unsigned(data_bits, FNAV_WNot_4_bit));

src/core/system_parameters/galileo_navigation_message.cc

@@ -125,8 +125,8 @@ void Galileo_Navigation_Message::reset()
     BGD_E1E5b_5 = 0.0;
     E5b_HS_5 = 0;
     E1B_HS_5 = 0;
-    E5b_DVS_5 = 0;
+    E5b_DVS_5 = false;
-    E1B_DVS_5 = 0;
+    E1B_DVS_5 = false;
 
     // GST
     WN_5 = 0;

src/core/system_parameters/gps_cnav_ephemeris.cc

@@ -37,17 +37,17 @@ Gps_CNAV_Ephemeris::Gps_CNAV_Ephemeris()
 {
     i_satellite_PRN = 0U;
 
-    d_Toe1 = -1.0;
+    d_Toe1 = -1;
-    d_Toe2 = -1.0;
+    d_Toe2 = -1;
 
-    d_TOW = 0.0;
+    d_TOW = 0;
     d_Crs = 0.0;
     d_M_0 = 0.0;
     d_Cuc = 0.0;
     d_e_eccentricity = 0.0;
     d_Cus = 0.0;
 
-    d_Toc = 0.0;
+    d_Toc = 0;
     d_Cic = 0.0;
     d_OMEGA0 = 0.0;
     d_Cis = 0.0;
@@ -79,7 +79,7 @@ Gps_CNAV_Ephemeris::Gps_CNAV_Ephemeris()
 
     i_URA = 0;
     i_signal_health = 0;
-    d_Top = 0.0;
+    d_Top = 0;
     d_DELTA_A = 0.0;
     d_A_DOT = 0.0;
     d_Delta_n = 0.0;

src/core/system_parameters/gps_cnav_ephemeris.h

@@ -54,7 +54,7 @@ public:
     int32_t i_GPS_week;        //!< GPS week number, aka WN [week]
     int32_t i_URA;             //!< ED Accuracy Index
     int32_t i_signal_health;   //!< Signal health (L1/L2/L5)
-    double d_Top;              //!< Data predict time of week
+    int32_t d_Top;             //!< Data predict time of week
     double d_DELTA_A;          //!< Semi-major axis difference at reference time
     double d_A_DOT;            //!< Change rate in semi-major axis
     double d_Delta_n;          //!< Mean Motion Difference From Computed Value [semi-circles/s]
@@ -63,8 +63,8 @@ public:
     double d_e_eccentricity;   //!< Eccentricity
     double d_OMEGA;            //!< Argument of Perigee [semi-cicles]
     double d_OMEGA0;           //!< Longitude of Ascending Node of Orbit Plane at Weekly Epoch [semi-cicles]
-    double d_Toe1;             //!< Ephemeris data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
+    int32_t d_Toe1;            //!< Ephemeris data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
-    double d_Toe2;             //!< Ephemeris data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
+    int32_t d_Toe2;            //!< Ephemeris data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
     double d_DELTA_OMEGA_DOT;  //!< Rate of Right Ascension  difference [semi-circles/s]
     double d_i_0;              //!< Inclination Angle at Reference Time [semi-circles]
     double d_IDOT;             //!< Rate of Inclination Angle [semi-circles/s]
@@ -76,7 +76,7 @@ public:
     double d_Cuc;              //!< Amplitude of the Cosine Harmonic Correction Term to the Argument of Latitude [rad]
 
     // Clock Correction and Accuracy Parameters
-    double d_Toc;   //!< clock data reference time (Ref. 20.3.3.3.3.1 IS-GPS-200E) [s]
+    int32_t d_Toc;  //!< clock data reference time (Ref. 20.3.3.3.3.1 IS-GPS-200E) [s]
     double d_A_f0;  //!< Coefficient 0 of code phase offset model [s]
     double d_A_f1;  //!< Coefficient 1 of code phase offset model [s/s]
     double d_A_f2;  //!< Coefficient 2 of code phase offset model [s/s^2]
@@ -92,7 +92,7 @@ public:
     double d_ISCL5I;
     double d_ISCL5Q;
 
-    double d_TOW;  //!< Time of GPS Week of the ephemeris set (taken from subframes TOW) [s]
+    int32_t d_TOW;  //!< Time of GPS Week of the ephemeris set (taken from subframes TOW) [s]
 
     /*! \brief If true, enhanced level of integrity assurance.
      *

src/core/system_parameters/gps_cnav_navigation_message.cc

@@ -55,7 +55,7 @@ void Gps_CNAV_Navigation_Message::reset()
     d_satvel_Y = 0.0;
     d_satvel_Z = 0.0;
 
-    d_TOW = 0.0;
+    d_TOW = 0;
 }
 
 
@@ -148,7 +148,7 @@ void Gps_CNAV_Navigation_Message::decode_page(std::bitset<GPS_CNAV_DATA_PAGE_BIT
     PRN = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_PRN));
     ephemeris_record.i_satellite_PRN = PRN;
 
-    d_TOW = static_cast<double>(read_navigation_unsigned(data_bits, CNAV_TOW));
+    d_TOW = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_TOW));
     d_TOW *= CNAV_TOW_LSB;
     ephemeris_record.d_TOW = d_TOW;
 
@@ -162,10 +162,10 @@ void Gps_CNAV_Navigation_Message::decode_page(std::bitset<GPS_CNAV_DATA_PAGE_BIT
         case 10:  // Ephemeris 1/2
             ephemeris_record.i_GPS_week = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_WN));
             ephemeris_record.i_signal_health = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_HEALTH));
-            ephemeris_record.d_Top = static_cast<double>(read_navigation_unsigned(data_bits, CNAV_TOP1));
+            ephemeris_record.d_Top = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_TOP1));
             ephemeris_record.d_Top *= CNAV_TOP1_LSB;
             ephemeris_record.d_URA0 = static_cast<double>(read_navigation_signed(data_bits, CNAV_URA));
-            ephemeris_record.d_Toe1 = static_cast<double>(read_navigation_unsigned(data_bits, CNAV_TOE1));
+            ephemeris_record.d_Toe1 = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_TOE1));
             ephemeris_record.d_Toe1 *= CNAV_TOE1_LSB;
             ephemeris_record.d_DELTA_A = static_cast<double>(read_navigation_signed(data_bits, CNAV_DELTA_A));
             ephemeris_record.d_DELTA_A *= CNAV_DELTA_A_LSB;
@@ -188,7 +188,7 @@ void Gps_CNAV_Navigation_Message::decode_page(std::bitset<GPS_CNAV_DATA_PAGE_BIT
             b_flag_ephemeris_1 = true;
             break;
         case 11:  // Ephemeris 2/2
-            ephemeris_record.d_Toe2 = static_cast<double>(read_navigation_unsigned(data_bits, CNAV_TOE2));
+            ephemeris_record.d_Toe2 = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_TOE2));
             ephemeris_record.d_Toe2 *= CNAV_TOE2_LSB;
             ephemeris_record.d_OMEGA0 = static_cast<double>(read_navigation_signed(data_bits, CNAV_OMEGA0));
             ephemeris_record.d_OMEGA0 *= CNAV_OMEGA0_LSB;
@@ -214,7 +214,7 @@ void Gps_CNAV_Navigation_Message::decode_page(std::bitset<GPS_CNAV_DATA_PAGE_BIT
             break;
         case 30:  // (CLOCK, IONO, GRUP DELAY)
             //clock
-            ephemeris_record.d_Toc = static_cast<double>(read_navigation_unsigned(data_bits, CNAV_TOC));
+            ephemeris_record.d_Toc = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_TOC));
             ephemeris_record.d_Toc *= CNAV_TOC_LSB;
             ephemeris_record.d_URA0 = static_cast<double>(read_navigation_signed(data_bits, CNAV_URA_NED0));
             ephemeris_record.d_URA1 = static_cast<double>(read_navigation_unsigned(data_bits, CNAV_URA_NED1));
@@ -282,9 +282,9 @@ void Gps_CNAV_Navigation_Message::decode_page(std::bitset<GPS_CNAV_DATA_PAGE_BIT
             b_flag_iono_valid = true;
             break;
         case 33:  // (CLOCK & UTC)
-            ephemeris_record.d_Top = static_cast<double>(read_navigation_unsigned(data_bits, CNAV_TOP1));
+            ephemeris_record.d_Top = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_TOP1));
             ephemeris_record.d_Top = ephemeris_record.d_Top * CNAV_TOP1_LSB;
-            ephemeris_record.d_Toc = static_cast<double>(read_navigation_unsigned(data_bits, CNAV_TOC));
+            ephemeris_record.d_Toc = static_cast<int32_t>(read_navigation_unsigned(data_bits, CNAV_TOC));
             ephemeris_record.d_Toc = ephemeris_record.d_Toc * CNAV_TOC_LSB;
             ephemeris_record.d_A_f0 = static_cast<double>(read_navigation_signed(data_bits, CNAV_AF0));
             ephemeris_record.d_A_f0 = ephemeris_record.d_A_f0 * CNAV_AF0_LSB;
@@ -300,10 +300,10 @@ void Gps_CNAV_Navigation_Message::decode_page(std::bitset<GPS_CNAV_DATA_PAGE_BIT
             utc_model_record.d_A2 = static_cast<double>(read_navigation_signed(data_bits, CNAV_A2));
             utc_model_record.d_A2 = utc_model_record.d_A2 * CNAV_A2_LSB;
 
-            utc_model_record.d_DeltaT_LS = static_cast<double>(read_navigation_signed(data_bits, CNAV_DELTA_TLS));
+            utc_model_record.d_DeltaT_LS = static_cast<int32_t>(read_navigation_signed(data_bits, CNAV_DELTA_TLS));
             utc_model_record.d_DeltaT_LS = utc_model_record.d_DeltaT_LS * CNAV_DELTA_TLS_LSB;
 
-            utc_model_record.d_t_OT = static_cast<double>(read_navigation_signed(data_bits, CNAV_TOT));
+            utc_model_record.d_t_OT = static_cast<int32_t>(read_navigation_signed(data_bits, CNAV_TOT));
             utc_model_record.d_t_OT = utc_model_record.d_t_OT * CNAV_TOT_LSB;
 
             utc_model_record.i_WN_T = static_cast<int32_t>(read_navigation_signed(data_bits, CNAV_WN_OT));
@@ -315,7 +315,7 @@ void Gps_CNAV_Navigation_Message::decode_page(std::bitset<GPS_CNAV_DATA_PAGE_BIT
             utc_model_record.i_DN = static_cast<int32_t>(read_navigation_signed(data_bits, CNAV_DN));
             utc_model_record.i_DN = utc_model_record.i_DN * CNAV_DN_LSB;
 
-            utc_model_record.d_DeltaT_LSF = static_cast<double>(read_navigation_signed(data_bits, CNAV_DELTA_TLSF));
+            utc_model_record.d_DeltaT_LSF = static_cast<int32_t>(read_navigation_signed(data_bits, CNAV_DELTA_TLSF));
             utc_model_record.d_DeltaT_LSF = utc_model_record.d_DeltaT_LSF * CNAV_DELTA_TLSF_LSB;
             b_flag_utc_valid = true;
             break;

src/core/system_parameters/gps_cnav_navigation_message.h

@@ -65,7 +65,7 @@ private:
     Gps_CNAV_Utc_Model utc_model_record;
 
 public:
-    double d_TOW;
+    int32_t d_TOW;
     bool b_flag_ephemeris_1;
     bool b_flag_ephemeris_2;
     bool b_flag_iono_valid;  //!< If set, it indicates that the ionospheric parameters are filled and are not yet read by the get_iono

src/core/system_parameters/gps_cnav_utc_model.cc

@@ -37,12 +37,12 @@ Gps_CNAV_Utc_Model::Gps_CNAV_Utc_Model()
     d_A2 = 0.0;
     d_A1 = 0.0;
     d_A0 = 0.0;
-    d_t_OT = 0.0;
+    d_t_OT = 0;
     i_WN_T = 0;
-    d_DeltaT_LS = 0.0;
+    d_DeltaT_LS = 0;
     i_WN_LSF = 0;
     i_DN = 0;
-    d_DeltaT_LSF = 0.0;
+    d_DeltaT_LSF = 0;
 }
 
 

src/core/system_parameters/gps_cnav_utc_model.h

@@ -49,12 +49,12 @@ public:
     double d_A2;           //!< 2nd order term of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200H) [s/s]
     double d_A1;           //!< 1st order term of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200H) [s/s]
     double d_A0;           //!< Constant of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200H) [s]
-    double d_t_OT;        //!< Reference time for UTC data (reference 20.3.4.5 and 20.3.3.5.2.4 IS-GPS-200H) [s]
+    int32_t d_t_OT;        //!< Reference time for UTC data (reference 20.3.4.5 and 20.3.3.5.2.4 IS-GPS-200H) [s]
     int32_t i_WN_T;        //!< UTC reference week number [weeks]
-    double d_DeltaT_LS;   //!< delta time due to leap seconds [s]. Number of leap seconds since 6-Jan-1980 as transmitted by the GPS almanac.
+    int32_t d_DeltaT_LS;   //!< delta time due to leap seconds [s]. Number of leap seconds since 6-Jan-1980 as transmitted by the GPS almanac.
     int32_t i_WN_LSF;      //!< Week number at the end of which the leap second becomes effective [weeks]
     int32_t i_DN;          //!< Day number (DN) at the end of which the leap second becomes effective [days]
-    double d_DeltaT_LSF;  //!< Scheduled future or recent past (relative to NAV message upload) value of the delta time due to leap seconds [s]
+    int32_t d_DeltaT_LSF;  //!< Scheduled future or recent past (relative to NAV message upload) value of the delta time due to leap seconds [s]
 
     /*!
      * Default constructor

src/core/system_parameters/gps_ephemeris.cc

@@ -38,7 +38,7 @@
 Gps_Ephemeris::Gps_Ephemeris()
 {
     i_satellite_PRN = 0U;
-    d_TOW = 0.0;
+    d_TOW = 0;
     d_Crs = 0.0;
     d_Delta_n = 0.0;
     d_M_0 = 0.0;
@@ -46,8 +46,8 @@ Gps_Ephemeris::Gps_Ephemeris()
     d_e_eccentricity = 0.0;
     d_Cus = 0.0;
     d_sqrt_A = 0.0;
-    d_Toe = 0.0;
+    d_Toe = 0;
-    d_Toc = 0.0;
+    d_Toc = 0;
     d_Cic = 0.0;
     d_OMEGA0 = 0.0;
     d_Cis = 0.0;
@@ -61,10 +61,10 @@ Gps_Ephemeris::Gps_Ephemeris()
     b_L2_P_data_flag = false;
     i_SV_accuracy = 0;
     i_SV_health = 0;
-    d_IODE_SF2 = 0.0;
+    d_IODE_SF2 = 0;
-    d_IODE_SF3 = 0.0;
+    d_IODE_SF3 = 0;
     d_TGD = 0.0;  // Estimated Group Delay Differential: L1-L2 correction term only for the benefit of "L1 P(Y)" or "L2 P(Y)" s users [s]
-    d_IODC = 0.0;  // Issue of Data, Clock
+    d_IODC = 0;   // Issue of Data, Clock
     i_AODO = 0;   // Age of Data Offset (AODO) term for the navigation message correction table (NMCT) contained in subframe 4 (reference paragraph 20.3.3.5.1.9) [s]
 
     b_fit_interval_flag = false;  // indicates the curve-fit interval used by the CS (Block II/IIA/IIR/IIR-M/IIF) and SS (Block IIIA) in determining the ephemeris parameters, as follows: 0  =  4 hours, 1  =  greater than 4 hours.

src/core/system_parameters/gps_ephemeris.h

@@ -60,7 +60,7 @@ private:
 
 public:
     uint32_t i_satellite_PRN;  // SV PRN NUMBER
-    double d_TOW;              //!< Time of GPS Week of the ephemeris set (taken from subframes TOW) [s]
+    int32_t d_TOW;             //!< Time of GPS Week of the ephemeris set (taken from subframes TOW) [s]
     double d_Crs;              //!< Amplitude of the Sine Harmonic Correction Term to the Orbit Radius [m]
     double d_Delta_n;          //!< Mean Motion Difference From Computed Value [semi-circles/s]
     double d_M_0;              //!< Mean Anomaly at Reference Time [semi-circles]
@@ -68,8 +68,8 @@ public:
     double d_e_eccentricity;   //!< Eccentricity [dimensionless]
     double d_Cus;              //!< Amplitude of the Sine Harmonic Correction Term to the Argument of Latitude [rad]
     double d_sqrt_A;           //!< Square Root of the Semi-Major Axis [sqrt(m)]
-    double d_Toe;              //!< Ephemeris data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
+    int32_t d_Toe;             //!< Ephemeris data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
-    double d_Toc;              //!< clock data reference time (Ref. 20.3.3.3.3.1 IS-GPS-200E) [s]
+    int32_t d_Toc;             //!< clock data reference time (Ref. 20.3.3.3.3.1 IS-GPS-200E) [s]
     double d_Cic;              //!< Amplitude of the Cosine Harmonic Correction Term to the Angle of Inclination [rad]
     double d_OMEGA0;           //!< Longitude of Ascending Node of Orbit Plane at Weekly Epoch [semi-circles]
     double d_Cis;              //!< Amplitude of the Sine Harmonic Correction Term to the Angle of Inclination [rad]
@@ -84,9 +84,9 @@ public:
     int32_t i_SV_accuracy;     //!< User Range Accuracy (URA) index of the SV (reference paragraph 6.2.1) for the standard positioning service user (Ref 20.3.3.3.1.3 IS-GPS-200E)
     int32_t i_SV_health;
     double d_TGD;        //!< Estimated Group Delay Differential: L1-L2 correction term only for the benefit of "L1 P(Y)" or "L2 P(Y)" s users [s]
-    double d_IODC;      //!< Issue of Data, Clock
+    int32_t d_IODC;      //!< Issue of Data, Clock
-    double d_IODE_SF2;  //!< Issue of Data, Ephemeris (IODE), subframe 2
+    int32_t d_IODE_SF2;  //!< Issue of Data, Ephemeris (IODE), subframe 2
-    double d_IODE_SF3;  //!< Issue of Data, Ephemeris(IODE), subframe 3
+    int32_t d_IODE_SF3;  //!< Issue of Data, Ephemeris(IODE), subframe 3
     int32_t i_AODO;      //!< Age of Data Offset (AODO) term for the navigation message correction table (NMCT) contained in subframe 4 (reference paragraph 20.3.3.5.1.9) [s]
 
     bool b_fit_interval_flag;  //!< indicates the curve-fit interval used by the CS (Block II/IIA/IIR/IIR-M/IIF) and SS (Block IIIA) in determining the ephemeris parameters, as follows: 0 = 4 hours, 1 = greater than 4 hours.

src/core/system_parameters/gps_navigation_message.cc

@@ -39,14 +39,14 @@ m * \file gps_navigation_message.cc
 void Gps_Navigation_Message::reset()
 {
     b_valid_ephemeris_set_flag = false;
-    d_TOW = 0.0;
+    d_TOW = 0;
-    d_TOW_SF1 = 0.0;
+    d_TOW_SF1 = 0;
-    d_TOW_SF2 = 0.0;
+    d_TOW_SF2 = 0;
-    d_TOW_SF3 = 0.0;
+    d_TOW_SF3 = 0;
-    d_TOW_SF4 = 0.0;
+    d_TOW_SF4 = 0;
-    d_TOW_SF5 = 0.0;
+    d_TOW_SF5 = 0;
-    d_IODE_SF2 = 0.0;
+    d_IODE_SF2 = 0;
-    d_IODE_SF3 = 0.0;
+    d_IODE_SF3 = 0;
     d_Crs = 0.0;
     d_Delta_n = 0.0;
     d_M_0 = 0.0;
@@ -54,8 +54,8 @@ void Gps_Navigation_Message::reset()
     d_e_eccentricity = 0.0;
     d_Cus = 0.0;
     d_sqrt_A = 0.0;
-    d_Toe = 0.0;
+    d_Toe = 0;
-    d_Toc = 0.0;
+    d_Toc = 0;
     d_Cic = 0.0;
     d_OMEGA0 = 0.0;
     d_Cis = 0.0;
@@ -70,7 +70,7 @@ void Gps_Navigation_Message::reset()
     i_SV_accuracy = 0;
     i_SV_health = 0;
     d_TGD = 0.0;
-    d_IODC = -1.0;
+    d_IODC = -1;
     i_AODO = 0;
 
     b_fit_interval_flag = false;
@@ -117,12 +117,12 @@ void Gps_Navigation_Message::reset()
     d_beta3 = 0.0;
     d_A1 = 0.0;
     d_A0 = 0.0;
-    d_t_OT = 0.0;
+    d_t_OT = 0;
     i_WN_T = 0;
-    d_DeltaT_LS = 0.0;
+    d_DeltaT_LS = 0;
     i_WN_LSF = 0;
     i_DN = 0;
-    d_DeltaT_LSF = 0.0;
+    d_DeltaT_LSF = 0;
 
     // Almanac
     i_Toa = 0;
@@ -257,9 +257,9 @@ int32_t Gps_Navigation_Message::subframe_decoder(char* subframe)
             // The transmitted TOW is actual TOW of the next subframe
             // (the variable subframe at this point contains bits of the last subframe).
             //TOW = bin2dec(subframe(31:47)) * 6;
-            d_TOW_SF1 = static_cast<double>(read_navigation_unsigned(subframe_bits, TOW));
+            d_TOW_SF1 = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, TOW));
             //we are in the first subframe (the transmitted TOW is the start time of the next subframe) !
-            d_TOW_SF1 = d_TOW_SF1 * 6.0;
+            d_TOW_SF1 = d_TOW_SF1 * 6;
             d_TOW = d_TOW_SF1;  // Set transmission time
             b_integrity_status_flag = read_navigation_bool(subframe_bits, INTEGRITY_STATUS_FLAG);
             b_alert_flag = read_navigation_bool(subframe_bits, ALERT_FLAG);
@@ -271,8 +271,8 @@ int32_t Gps_Navigation_Message::subframe_decoder(char* subframe)
             i_code_on_L2 = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, CA_OR_P_ON_L2));
             d_TGD = static_cast<double>(read_navigation_signed(subframe_bits, T_GD));
             d_TGD = d_TGD * T_GD_LSB;
-            d_IODC = static_cast<double>(read_navigation_unsigned(subframe_bits, IODC));
+            d_IODC = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, IODC));
-            d_Toc = static_cast<double>(read_navigation_unsigned(subframe_bits, T_OC));
+            d_Toc = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, T_OC));
             d_Toc = d_Toc * T_OC_LSB;
             d_A_f0 = static_cast<double>(read_navigation_signed(subframe_bits, A_F0));
             d_A_f0 = d_A_f0 * A_F0_LSB;
@@ -283,13 +283,13 @@ int32_t Gps_Navigation_Message::subframe_decoder(char* subframe)
             break;
 
         case 2:  //--- It is subframe 2 -------------------
-            d_TOW_SF2 = static_cast<double>(read_navigation_unsigned(subframe_bits, TOW));
+            d_TOW_SF2 = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, TOW));
-            d_TOW_SF2 = d_TOW_SF2 * 6.0;
+            d_TOW_SF2 = d_TOW_SF2 * 6;
             d_TOW = d_TOW_SF2;  // Set transmission time
             b_integrity_status_flag = read_navigation_bool(subframe_bits, INTEGRITY_STATUS_FLAG);
             b_alert_flag = read_navigation_bool(subframe_bits, ALERT_FLAG);
             b_antispoofing_flag = read_navigation_bool(subframe_bits, ANTI_SPOOFING_FLAG);
-            d_IODE_SF2 = static_cast<double>(read_navigation_unsigned(subframe_bits, IODE_SF2));
+            d_IODE_SF2 = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, IODE_SF2));
             d_Crs = static_cast<double>(read_navigation_signed(subframe_bits, C_RS));
             d_Crs = d_Crs * C_RS_LSB;
             d_Delta_n = static_cast<double>(read_navigation_signed(subframe_bits, DELTA_N));
@@ -304,7 +304,7 @@ int32_t Gps_Navigation_Message::subframe_decoder(char* subframe)
             d_Cus = d_Cus * C_US_LSB;
             d_sqrt_A = static_cast<double>(read_navigation_unsigned(subframe_bits, SQRT_A));
             d_sqrt_A = d_sqrt_A * SQRT_A_LSB;
-            d_Toe = static_cast<double>(read_navigation_unsigned(subframe_bits, T_OE));
+            d_Toe = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, T_OE));
             d_Toe = d_Toe * T_OE_LSB;
             b_fit_interval_flag = read_navigation_bool(subframe_bits, FIT_INTERVAL_FLAG);
             i_AODO = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, AODO));
@@ -312,8 +312,8 @@ int32_t Gps_Navigation_Message::subframe_decoder(char* subframe)
             break;
 
         case 3:  // --- It is subframe 3 -------------------------------------
-            d_TOW_SF3 = static_cast<double>(read_navigation_unsigned(subframe_bits, TOW));
+            d_TOW_SF3 = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, TOW));
-            d_TOW_SF3 = d_TOW_SF3 * 6.0;
+            d_TOW_SF3 = d_TOW_SF3 * 6;
             d_TOW = d_TOW_SF3;  // Set transmission time
             b_integrity_status_flag = read_navigation_bool(subframe_bits, INTEGRITY_STATUS_FLAG);
             b_alert_flag = read_navigation_bool(subframe_bits, ALERT_FLAG);
@@ -332,7 +332,7 @@ int32_t Gps_Navigation_Message::subframe_decoder(char* subframe)
             d_OMEGA = d_OMEGA * OMEGA_LSB;
             d_OMEGA_DOT = static_cast<double>(read_navigation_signed(subframe_bits, OMEGA_DOT));
             d_OMEGA_DOT = d_OMEGA_DOT * OMEGA_DOT_LSB;
-            d_IODE_SF3 = static_cast<double>(read_navigation_unsigned(subframe_bits, IODE_SF3));
+            d_IODE_SF3 = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, IODE_SF3));
             d_IDOT = static_cast<double>(read_navigation_signed(subframe_bits, I_DOT));
             d_IDOT = d_IDOT * I_DOT_LSB;
             break;
@@ -340,8 +340,8 @@ int32_t Gps_Navigation_Message::subframe_decoder(char* subframe)
         case 4:  // --- It is subframe 4 ---------- Almanac, ionospheric model, UTC parameters, SV health (PRN: 25-32)
             int32_t SV_data_ID;
             int32_t SV_page;
-            d_TOW_SF4 = static_cast<double>(read_navigation_unsigned(subframe_bits, TOW));
+            d_TOW_SF4 = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, TOW));
-            d_TOW_SF4 = d_TOW_SF4 * 6.0;
+            d_TOW_SF4 = d_TOW_SF4 * 6;
             d_TOW = d_TOW_SF4;  // Set transmission time
             b_integrity_status_flag = read_navigation_bool(subframe_bits, INTEGRITY_STATUS_FLAG);
             b_alert_flag = read_navigation_bool(subframe_bits, ALERT_FLAG);
@@ -384,13 +384,13 @@ int32_t Gps_Navigation_Message::subframe_decoder(char* subframe)
                     d_A1 = d_A1 * A_1_LSB;
                     d_A0 = static_cast<double>(read_navigation_signed(subframe_bits, A_0));
                     d_A0 = d_A0 * A_0_LSB;
-                    d_t_OT = static_cast<double>(read_navigation_unsigned(subframe_bits, T_OT));
+                    d_t_OT = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, T_OT));
                     d_t_OT = d_t_OT * T_OT_LSB;
                     i_WN_T = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, WN_T));
-                    d_DeltaT_LS = static_cast<double>(read_navigation_signed(subframe_bits, DELTAT_LS));
+                    d_DeltaT_LS = static_cast<int32_t>(read_navigation_signed(subframe_bits, DELTAT_LS));
                     i_WN_LSF = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, WN_LSF));
                     i_DN = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, DN));  // Right-justified ?
-                    d_DeltaT_LSF = static_cast<double>(read_navigation_signed(subframe_bits, DELTAT_LSF));
+                    d_DeltaT_LSF = static_cast<int32_t>(read_navigation_signed(subframe_bits, DELTAT_LSF));
                     flag_iono_valid = true;
                     flag_utc_model_valid = true;
                 }
@@ -417,8 +417,8 @@ int32_t Gps_Navigation_Message::subframe_decoder(char* subframe)
         case 5:  //--- It is subframe 5 -----------------almanac health (PRN: 1-24) and Almanac reference week number and time.
             int32_t SV_data_ID_5;
             int32_t SV_page_5;
-            d_TOW_SF5 = static_cast<double>(read_navigation_unsigned(subframe_bits, TOW));
+            d_TOW_SF5 = static_cast<int32_t>(read_navigation_unsigned(subframe_bits, TOW));
-            d_TOW_SF5 = d_TOW_SF5 * 6.0;
+            d_TOW_SF5 = d_TOW_SF5 * 6;
             d_TOW = d_TOW_SF5;  // Set transmission time
             b_integrity_status_flag = read_navigation_bool(subframe_bits, INTEGRITY_STATUS_FLAG);
             b_alert_flag = read_navigation_bool(subframe_bits, ALERT_FLAG);

src/core/system_parameters/gps_navigation_message.h

@@ -62,14 +62,14 @@ private:
 public:
     bool b_valid_ephemeris_set_flag;  // flag indicating that this ephemeris set have passed the validation check
     // broadcast orbit 1
-    double d_TOW;      //!< Time of GPS Week of the ephemeris set (taken from subframes TOW) [s]
+    int32_t d_TOW;      //!< Time of GPS Week of the ephemeris set (taken from subframes TOW) [s]
-    double d_TOW_SF1;  //!< Time of GPS Week from HOW word of Subframe 1 [s]
+    int32_t d_TOW_SF1;  //!< Time of GPS Week from HOW word of Subframe 1 [s]
-    double d_TOW_SF2;  //!< Time of GPS Week from HOW word of Subframe 2 [s]
+    int32_t d_TOW_SF2;  //!< Time of GPS Week from HOW word of Subframe 2 [s]
-    double d_TOW_SF3;  //!< Time of GPS Week from HOW word of Subframe 3 [s]
+    int32_t d_TOW_SF3;  //!< Time of GPS Week from HOW word of Subframe 3 [s]
-    double d_TOW_SF4;  //!< Time of GPS Week from HOW word of Subframe 4 [s]
+    int32_t d_TOW_SF4;  //!< Time of GPS Week from HOW word of Subframe 4 [s]
-    double d_TOW_SF5;  //!< Time of GPS Week from HOW word of Subframe 5 [s]
+    int32_t d_TOW_SF5;  //!< Time of GPS Week from HOW word of Subframe 5 [s]
-    double d_IODE_SF2;
+    int32_t d_IODE_SF2;
-    double d_IODE_SF3;
+    int32_t d_IODE_SF3;
     double d_Crs;      //!< Amplitude of the Sine Harmonic Correction Term to the Orbit Radius [m]
     double d_Delta_n;  //!< Mean Motion Difference From Computed Value [semi-circles/s]
     double d_M_0;      //!< Mean Anomaly at Reference Time [semi-circles]
@@ -79,8 +79,8 @@ public:
     double d_Cus;             //!< Amplitude of the Sine Harmonic Correction Term to the Argument of Latitude [rad]
     double d_sqrt_A;          //!< Square Root of the Semi-Major Axis [sqrt(m)]
     // broadcast orbit 3
-    double d_Toe;     //!< Ephemeris data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
+    int32_t d_Toe;    //!< Ephemeris data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
-    double d_Toc;     //!< clock data reference time (Ref. 20.3.3.3.3.1 IS-GPS-200E) [s]
+    int32_t d_Toc;    //!< clock data reference time (Ref. 20.3.3.3.3.1 IS-GPS-200E) [s]
     double d_Cic;     //!< Amplitude of the Cosine Harmonic Correction Term to the Angle of Inclination [rad]
     double d_OMEGA0;  //!< Longitude of Ascending Node of Orbit Plane at Weekly Epoch [semi-circles]
     double d_Cis;     //!< Amplitude of the Sine Harmonic Correction Term to the Angle of Inclination [rad]
@@ -98,7 +98,7 @@ public:
     int32_t i_SV_accuracy;  //!< User Range Accuracy (URA) index of the SV (reference paragraph 6.2.1) for the standard positioning service user (Ref 20.3.3.3.1.3 IS-GPS-200E)
     int32_t i_SV_health;
     double d_TGD;    //!< Estimated Group Delay Differential: L1-L2 correction term only for the benefit of "L1 P(Y)" or "L2 P(Y)" s users [s]
-    double d_IODC;  //!< Issue of Data, Clock
+    int32_t d_IODC;  //!< Issue of Data, Clock
     // broadcast orbit 7
     int32_t i_AODO;            //!< Age of Data Offset (AODO) term for the navigation message correction table (NMCT) contained in subframe 4 (reference paragraph 20.3.3.5.1.9) [s]
     bool b_fit_interval_flag;  //!< indicates the curve-fit interval used by the CS (Block II/IIA/IIR/IIR-M/IIF) and SS (Block IIIA) in determining the ephemeris parameters, as follows: 0 = 4 hours, 1 = greater than 4 hours.
@@ -162,14 +162,15 @@ public:
 
     // UTC parameters
     bool flag_utc_model_valid;  //!< If set, it indicates that the UTC model parameters are filled
-    double d_A1;                //!< 1st order term of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200E) [s/s]
     double d_A0;                //!< Constant of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200E) [s]
-    double d_t_OT;              //!< Reference time for UTC data (reference 20.3.4.5 and 20.3.3.5.2.4 IS-GPS-200E) [s]
+    double d_A1;                //!< 1st order term of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200E) [s/s]
+    double d_A2;                //!< 2nd order term of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200E) [s/s]
+    int32_t d_t_OT;             //!< Reference time for UTC data (reference 20.3.4.5 and 20.3.3.5.2.4 IS-GPS-200E) [s]
     int32_t i_WN_T;             //!< UTC reference week number [weeks]
-    double d_DeltaT_LS;         //!< delta time due to leap seconds [s]. Number of leap seconds since 6-Jan-1980 as transmitted by the GPS almanac.
+    int32_t d_DeltaT_LS;        //!< delta time due to leap seconds [s]. Number of leap seconds since 6-Jan-1980 as transmitted by the GPS almanac.
     int32_t i_WN_LSF;           //!< Week number at the end of which the leap second becomes effective [weeks]
     int32_t i_DN;               //!< Day number (DN) at the end of which the leap second becomes effective [days]
-    double d_DeltaT_LSF;        //!< Scheduled future or recent past (relative to NAV message upload) value of the delta time due to leap seconds [s]
+    int32_t d_DeltaT_LSF;       //!< Scheduled future or recent past (relative to NAV message upload) value of the delta time due to leap seconds [s]
 
     // Satellite velocity
     double d_satvel_X;  //!< Earth-fixed velocity coordinate x of the satellite [m]

src/core/system_parameters/gps_utc_model.cc

@@ -35,14 +35,15 @@
 Gps_Utc_Model::Gps_Utc_Model()
 {
     valid = false;
-    d_A1 = 0.0;
     d_A0 = 0.0;
-    d_t_OT = 0.0;
+    d_A1 = 0.0;
+    d_A2 = 0.0;
+    d_t_OT = 0;
     i_WN_T = 0;
-    d_DeltaT_LS = 0.0;
+    d_DeltaT_LS = 0;
     i_WN_LSF = 0;
     i_DN = 0;
-    d_DeltaT_LSF = 0.0;
+    d_DeltaT_LSF = 0;
 }
 
 

src/core/system_parameters/gps_utc_model.h

@@ -45,14 +45,15 @@ class Gps_Utc_Model
 public:
     bool valid;
     // UTC parameters
-    double d_A1;          //!< 1st order term of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200E) [s/s]
     double d_A0;           //!< Constant of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200E) [s]
-    double d_t_OT;        //!< Reference time for UTC data (reference 20.3.4.5 and 20.3.3.5.2.4 IS-GPS-200E) [s]
+    double d_A1;           //!< 1st order term of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200E) [s/s]
+    double d_A2;           //!< 2nd order term of a model that relates GPS and UTC time (ref. 20.3.3.5.2.4 IS-GPS-200E) [s/s]
+    int32_t d_t_OT;        //!< Reference time for UTC data (reference 20.3.4.5 and 20.3.3.5.2.4 IS-GPS-200E) [s]
     int32_t i_WN_T;        //!< UTC reference week number [weeks]
-    double d_DeltaT_LS;   //!< delta time due to leap seconds [s]. Number of leap seconds since 6-Jan-1980 as transmitted by the GPS almanac.
+    int32_t d_DeltaT_LS;   //!< delta time due to leap seconds [s]. Number of leap seconds since 6-Jan-1980 as transmitted by the GPS almanac.
     int32_t i_WN_LSF;      //!< Week number at the end of which the leap second becomes effective [weeks]
     int32_t i_DN;          //!< Day number (DN) at the end of which the leap second becomes effective [days]
-    double d_DeltaT_LSF;  //!< Scheduled future or recent past (relative to NAV message upload) value of the delta time due to leap seconds [s]
+    int32_t d_DeltaT_LSF;  //!< Scheduled future or recent past (relative to NAV message upload) value of the delta time due to leap seconds [s]
 
     /*!
      * Default constructor