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GSoC commit from Mara Branzanti:

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- Galileo telemetry decoding updates

git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@406 64b25241-fba3-4117-9849-534c7e92360d
This commit is contained in:
Javier Arribas 2013-08-20 10:43:53 +00:00
parent c4508f875f
commit c0e103aabc
4 changed files with 151 additions and 132 deletions
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18
src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_e1b_telemetry_decoder_cc.cc
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@ -284,46 +284,44 @@ int galileo_e1b_telemetry_decoder_cc::general_work (int noutput_items, gr_vector
}
// Galileo_Navigation_Message d_nav; // Now is a class member object, to store the intermediate results from call to call
//std::cout<<"page_string="<<page_String<<std::endl; //correctly transformed to char
if (page_part_bits[0]==1)
{
std::cout<<"Page Odd"<<std::endl;
//std::cout<<"Page Odd"<<std::endl;
d_nav.split_page(page_String.c_str(), flag_even_word_arrived);
//decode_page.split_page(page_String, flag_even_word_arrived);
flag_even_word_arrived=0;
std::cout << "page odd" << page_String << std::endl;
//std::cout << "page odd" << page_String << std::endl;
//std::cout<<"Page type ="<< page_part_bits[1]<<std::endl;
}
else
{
std::cout<<"Page Even"<<std::endl;
//std::cout<<"Page Even"<<std::endl;
d_nav.split_page(page_String.c_str(), flag_even_word_arrived);
flag_even_word_arrived=1;
std::cout << "page even" << std::endl << page_String << std::endl;
//std::cout << "page even" << std::endl << page_String << std::endl;
//std::cout<<"Page type ="<< page_part_bits[1]<<std::endl;
}
// 4. Push the new navigation data to the queues
//ToDo: Decide if we have an updated ephemeris for the current satellite,
// fill the ephemeris class and push the object to the concurrent queue
// Do the same for the
// sample from Gps queues
if (d_nav.have_new_ephemeris()==true)
{
// get ephemeris object for this SV
Galileo_Ephemeris ephemeris=d_nav.get_ephemeris();//notice that the read operation will clear the valid flag
std::cout<<"New Galileo Ephemeris received for SV "<<d_satellite.get_PRN()<<std::endl;
d_ephemeris_queue->push(ephemeris);
}
if (d_nav.have_new_iono()==true)
if (d_nav.have_new_iono_and_GST()==true)
{
Galileo_Iono iono=d_nav.get_iono(); //notice that the read operation will clear the valid flag
std::cout<<"New Galileo IONO model received for SV "<<d_satellite.get_PRN()<<std::endl;
d_iono_queue->push(iono);
}
if (d_nav.have_new_utc_model()==true)
{
Galileo_Utc_Model utc_model=d_nav.get_utc_model(); //notice that the read operation will clear the valid flag
std::cout<<"New Galileo UTC model received for SV "<<d_satellite.get_PRN()<<std::endl;
d_utc_model_queue->push(utc_model);
}

2
src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_e1b_telemetry_decoder_cc.h
View File

@ -118,7 +118,7 @@ private:
// navigation message vars
Galileo_Navigation_Message d_nav;
//ToDo: Update the Galileo_Ephemeris,Galileo_Iono,Galileo_Utc_Model, and Galileo_Almanac classes to store the Galileo parameters
// Galileo ephemeris queue
concurrent_queue<Galileo_Ephemeris> *d_ephemeris_queue;
// ionospheric parameters queue

222
src/core/system_parameters/galileo_navigation_message.cc
View File

@ -45,6 +45,24 @@ typedef boost::crc_optimal<24, 0x1864CFBu, 0x0, 0x0, false, false> CRC_Galileo_I
void Galileo_Navigation_Message::reset()
{
flag_even_word = 0;
flag_all_ephemeris = false; // flag indicating that all words containing ephemeris have been received
flag_ephemeris_1 = false; // flag indicating that ephemeris 1/4 (word 1) have been received
flag_ephemeris_2 = false; // flag indicating that ephemeris 2/4 (word 2) have been received
flag_ephemeris_3 = false; // flag indicating that ephemeris 3/4 (word 3) have been received
flag_ephemeris_4 = false; // flag indicating that ephemeris 4/4 (word 4) have been received
flag_iono_and_GST = false; // flag indicating that ionospheric parameters (word 5) have been received
flag_utc_model = false; // flag indicating that utc model parameters (word 6) have been received
flag_all_almanac = false; // flag indicating that all almanac have been received
flag_almanac_1 = false; // flag indicating that almanac 1/4 (word 7) have been received
flag_almanac_2 = false; // flag indicating that almanac 2/4 (word 8) have been received
flag_almanac_3 = false; // flag indicating that almanac 3/4 (word 9) have been received
flag_almanac_4 = false; // flag indicating that almanac 4/4 (word 10) have been received
/*Word type 1: Ephemeris (1/4)*/
IOD_nav_1 = 0;
t0e_1 = 0;
@ -345,7 +363,6 @@ bool Galileo_Navigation_Message::read_navigation_bool(std::bitset<GALILEO_DATA_J
void Galileo_Navigation_Message::split_page(const char *page, int flag_even_word){
// ToDo: Replace all the C structures and string operations with std::string and std::stringstream C++ classes.
// ToDo: Clean all the tests and create an independent google test code for the telemetry decoder.
@ -405,25 +422,17 @@ void Galileo_Navigation_Message::split_page(const char *page, int flag_even_word
std::string TLM_word_for_CRC;
TLM_word_for_CRC=TLM_word_for_CRC_stream.str().substr(0,GALILEO_DATA_FRAME_BITS);
std::cout <<"frame for CRC="<<TLM_word_for_CRC<<std::endl;
std::cout <<"frame length="<<TLM_word_for_CRC.length()<<std::endl;
std::bitset<GALILEO_DATA_FRAME_BITS> TLM_word_for_CRC_bits(TLM_word_for_CRC);
std::bitset<24> checksum(CRC_data);
if (Tail_odd.compare(correct_tail) != 0)
std::cout << "Tail odd is not correct!" << std::endl;
else std::cout<<"Tail odd is correct!"<<std::endl;
//if (Tail_odd.compare(correct_tail) != 0)
// std::cout << "Tail odd is not correct!" << std::endl;
//else std::cout<<"Tail odd is correct!"<<std::endl;
if (CRC_test(TLM_word_for_CRC_bits,checksum.to_ulong())==true)
{
// CRC correct: Decode word
std::cout<<"CRC correct!"<<std::endl;
}else{
// CRC wrong.. discard frame
std::cout<<"CRC error!"<<std::endl;
}
//********** end of CRC checksum control ***/
std::string page_number_bits = Data_k.substr (0,6);
//std::cout << "Page number bits from Data k" << std::endl << page_number_bits << std::endl;
@ -436,6 +445,32 @@ void Galileo_Navigation_Message::split_page(const char *page, int flag_even_word
page_jk_decoder(Data_jk_ephemeris.c_str()); // Corresponding to ephemeris_decode.m in matlab code
/*if (have_new_ephemeris()==true){
std::cout<<"All ephemeris have been received" << std::endl;
}*/
double t_GST;
if ((have_new_iono_and_GST() == true) and (flag_all_ephemeris==true))
{
std::cout <<"GST and ephemeris parameters have been received, now it is possible to compute satellite position"<< std::endl;
t_GST = Galileo_System_Time(WN_5, TOW_5);
std::cout << "Galileo System Time [sec]: " << t_GST << std::endl;
satellitePosition(t_GST);
flag_all_ephemeris=false;
}
double t_UTC;
if ((have_new_iono_and_GST() == true) and (have_new_utc_model() == true))
{
t_UTC = GST_to_UTC_time(t_GST, WN_5);
std::cout << "UTC [sec]: " << t_UTC << std::endl;
}
}else{
// CRC wrong.. discard frame
std::cout<<"CRC error!"<<std::endl;
}
//********** end of CRC checksum control ***/
}
} /*end if (page_string.at(0)=='1') */
@ -445,34 +480,72 @@ void Galileo_Navigation_Message::split_page(const char *page, int flag_even_word
//std::cout << "Page even in split page" << std::endl << page_Even << std::endl;
std::string tail_Even = page_string.substr (114,6);
//std::cout << "tail_even_string: " << tail_Even <<std::endl;
if (tail_Even.compare(correct_tail) != 0)
std::cout << "Tail even is not correct!" << std::endl;
else std::cout<<"Tail even is correct!"<< std::endl;
//if (tail_Even.compare(correct_tail) != 0)
// std::cout << "Tail even is not correct!" << std::endl;
//else std::cout<<"Tail even is correct!"<< std::endl;
}
}
bool Galileo_Navigation_Message::have_new_ephemeris()
bool Galileo_Navigation_Message::have_new_ephemeris() //Check if we have a new ephemeris stored in the galileo navigation class
{
//ToDo: Check if whe have a new ephemeris data set stored in the galileo navigation class
/*std::cout << "flag ephememeris 1: " << flag_ephemeris_1 <<std::endl;
std::cout << "flag ephememeris 2: " << flag_ephemeris_2 <<std::endl;
std::cout << "flag ephememeris 3: " << flag_ephemeris_3 <<std::endl;
std::cout << "flag ephememeris 4: " << flag_ephemeris_4 <<std::endl;*/
if ((flag_ephemeris_1 == true) and (flag_ephemeris_2 == true) and (flag_ephemeris_3 == true) and (flag_ephemeris_4 == true))
{
std::cout<< "All ephemeris have been received"<< std::endl;
flag_ephemeris_1 = false;// clear the flag
flag_ephemeris_2 = false;// clear the flag
flag_ephemeris_3 = false;// clear the flag
flag_ephemeris_4 = false;// clear the flag
flag_all_ephemeris = true;
return true;
}
else
return false;
}
bool Galileo_Navigation_Message::have_new_iono()
bool Galileo_Navigation_Message::have_new_iono_and_GST() //Check if we have a new iono data set stored in the galileo navigation class
{
//ToDo: Check if whe have a new iono data set stored in the galileo navigation class
if (flag_iono_and_GST == true)
{
flag_iono_and_GST=false; // clear the flag
return true;
}else
return false;
}
bool Galileo_Navigation_Message::have_new_utc_model()
bool Galileo_Navigation_Message::have_new_utc_model() // Check if we have a new utc data set stored in the galileo navigation class
{
//ToDo: Check if whe have a new utc data set stored in the galileo navigation class
if (flag_utc_model == true)
{
flag_utc_model=false; // clear the flag
return true;
}
else
return false;
}
bool Galileo_Navigation_Message::have_new_almanac()
bool Galileo_Navigation_Message::have_new_almanac() //Check if we have a new almanac data set stored in the galileo navigation class
{
//ToDo: Check if whe have a new almanac data set stored in the galileo navigation class
if ((flag_almanac_1 == true) and (flag_almanac_2 == true) and (flag_almanac_3 == true) and (flag_almanac_4 == true))
{
//std::cout<< "All almanac have been received"<< std::endl;
flag_almanac_1 = false;
flag_almanac_2 = false;
flag_almanac_3 = false;
flag_almanac_4 = false;
flag_all_almanac = true;
return true;
}
else
return false;
}
@ -646,7 +719,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
A_1 = (double)read_navigation_unsigned(data_jk_bits, A_1_bit);
A_1 = A_1 * A_1_LSB_gal;
std::cout << "A_1= " << A_1 <<std::endl;
flag_ephemeris_1 = true;
break;
case 2: /*Word type 2: Ephemeris (2/4)*/
@ -665,6 +738,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
iDot_2 = (double)read_navigation_unsigned(data_jk_bits, iDot_2_bit);
iDot_2 = iDot_2 * iDot_2_LSB;
std::cout<<"iDot_2= "<< iDot_2 <<std::endl;
flag_ephemeris_2 = true;
break;
case 3: /*Word type 3: Ephemeris (3/4) and SISA*/
@ -690,6 +764,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
std::cout<<"C_rs_3= "<< C_rs_3 <<std::endl;
SISA_3 = (double)read_navigation_unsigned(data_jk_bits, SISA_3_bit);
std::cout<<"SISA_3= "<< SISA_3 <<std::endl;
flag_ephemeris_3 = true;
break;
case 4: /* Word type 4: Ephemeris (4/4) and Clock correction parameters*/
@ -718,6 +793,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
std::cout<<"af2_4 = "<< af2_4 <<std::endl;
spare_4 = (double)read_navigation_unsigned(data_jk_bits, spare_4_bit);
std::cout<<"spare_4 = "<< spare_4 <<std::endl;
flag_ephemeris_4 = true;
break;
case 5: /*Word type 5: Ionospheric correction, BGD, signal health and data validity status and GST*/
@ -764,6 +840,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
std::cout<<"TOW_5= "<< TOW_5 <<std::endl;
spare_5 = (double)read_navigation_unsigned(data_jk_bits, spare_5_bit);
std::cout<<"spare_5= "<< spare_5 <<std::endl;
flag_iono_and_GST = true;
break;
case 6: /*Word type 6: GST-UTC conversion parameters*/
@ -796,7 +873,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
TOW_6= (double)read_navigation_unsigned(data_jk_bits, TOW_6_bit);
std::cout << "TOW_6= " << TOW_6 << std::endl;
flag_utc_model = true;
break;
case 7: /*Word type 7: Almanac for SVID1 (1/2), almanac reference time and almanac reference week number*/
@ -841,7 +918,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
M0_7= (double)read_navigation_unsigned(data_jk_bits, M0_7_bit);
M0_7= M0_7 * M0_7_LSB;
std::cout << "M0_7= " << M0_7 << std::endl;
flag_almanac_1 = true;
break;
case 8: /*Word type 8: Almanac for SVID1 (2/2) and SVID2 (1/2)*/
@ -889,7 +966,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
Omega_dot_8= (double)read_navigation_unsigned(data_jk_bits, Omega_dot_8_bit);
Omega_dot_8= Omega_dot_8 * Omega_dot_8_LSB;
std::cout << "Omega_dot_8= " << Omega_dot_8 << std::endl;
flag_almanac_2 = true;
break;
case 9: /*Word type 9: Almanac for SVID2 (2/2) and SVID3 (1/2)*/
@ -941,7 +1018,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
delta_i_9= (double)read_navigation_unsigned(data_jk_bits, delta_i_9_bit);
delta_i_9= delta_i_9 * delta_i_9_LSB;
std::cout << "delta_i_9= " << delta_i_9 << std::endl;
flag_almanac_3 = true;
break;
case 10: /*Word type 10: Almanac for SVID3 (2/2) and GST-GPS conversion parameters*/
@ -989,7 +1066,7 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
WN_0G_10= (double)read_navigation_unsigned(data_jk_bits, WN_0G_10_bit);
std::cout << "WN_0G_10= " << WN_0G_10 << std::endl;
flag_almanac_4 = true;
break;
case 0: /*Word type 0: I/NAV Spare Word*/
@ -1008,82 +1085,6 @@ int Galileo_Navigation_Message::page_jk_decoder(const char *data_jk)
return page_number;
}
/*Galileo_Ephemeris Galileo_Navigation_Message::get_Galileo_ephemeris()
{
Galileo_Ephemeris Gal_ephemeris;
Gal_ephemeris.M0_1 = M0_1; // Mean anomaly at reference time [semi-circles]
Gal_ephemeris.delta_n_3 = delta_n_3; // Mean motion difference from computed value [semi-circles/sec]
Gal_ephemeris.e_1 = e_1; // Eccentricity
Gal_ephemeris.A_1 = A_1; // Square root of the semi-major axis [metres^1/2]
Gal_ephemeris.OMEGA_0_2 = OMEGA_0_2;// Longitude of ascending node of orbital plane at weekly epoch [semi-circles]
Gal_ephemeris.i_0_2 = i_0_2; // Inclination angle at reference time [semi-circles]
Gal_ephemeris.omega_2 = omega_2; // Argument of perigee [semi-circles]
Gal_ephemeris.OMEGA_dot_3 = OMEGA_dot_3; // Rate of right ascension [semi-circles/sec]
Gal_ephemeris.iDot_2 = iDot_2; // Rate of inclination angle [semi-circles/sec]
Gal_ephemeris.C_uc_3 = C_uc_3; // Amplitude of the cosine harmonic correction term to the argument of latitude [radians]
Gal_ephemeris.C_us_3 = C_us_3; // Amplitude of the sine harmonic correction term to the argument of latitude [radians]
Gal_ephemeris.C_rc_3 = C_rc_3; // Amplitude of the cosine harmonic correction term to the orbit radius [meters]
Gal_ephemeris.C_rs_3 = C_rs_3; // Amplitude of the sine harmonic correction term to the orbit radius [meters]
Gal_ephemeris.C_ic_4 = C_ic_4; // Amplitude of the cosine harmonic correction term to the angle of inclination [radians]
Gal_ephemeris.C_is_4 = C_is_4; // Amplitude of the sine harmonic correction term to the angle of inclination [radians]
Gal_ephemeris.t0e_1 = t0e_1; // Ephemeris reference time [s]
/*Clock correction parameters*
Gal_ephemeris.t0c_4 = t0c_4; //Clock correction data reference Time of Week [sec]
Gal_ephemeris.af0_4 = af0_4; //SV clock bias correction coefficient [s]
Gal_ephemeris.af1_4 = af1_4; //SV clock drift correction coefficient [s/s]
Gal_ephemeris.af2_4 = af2_4; //SV clock drift rate correction coefficient [s/s^2]
/*GST*
Gal_ephemeris.WN_5 = WN_5;//Week number
Gal_ephemeris.TOW_5 = TOW_5;//Time of Week
return Gal_ephemeris;
}*/
/*Galileo_Iono Galileo_Navigation_Message::get_Galileo_Iono()
{
Galileo_Iono Gal_iono;
/*Ionospheric correction
/*Az
Gal_iono.ai0_5 = ai0_5; //Effective Ionisation Level 1st order parameter [sfu]
Gal_iono.ai1_5 = ai1_5; //Effective Ionisation Level 2st order parameter [sfu/degree]
Gal_iono.ai2_5 = ai2_5; //Effective Ionisation Level 3st order parameter [sfu/degree]
/*Ionospheric disturbance flag
Gal_iono.Region1_flag_5 = Region1_flag_5; // Ionospheric Disturbance Flag for region 1
Gal_iono.Region2_flag_5 = Region2_flag_5; // Ionospheric Disturbance Flag for region 2
Gal_iono.Region3_flag_5 = Region3_flag_5; // Ionospheric Disturbance Flag for region 3
Gal_iono.Region4_flag_5 = Region4_flag_5; // Ionospheric Disturbance Flag for region 4
Gal_iono.Region5_flag_5 = Region5_flag_5; // Ionospheric Disturbance Flag for region 5
return Gal_iono;
}*/
/*Galileo_Utc_Model Galileo_Navigation_Message::get_Galileo_utc_model()
{
Galileo_Utc_Model Gal_utc_model;
//Gal_utc_model.valid = flag_utc_model_valid;
/*Word type 6: GST-UTC conversion parameters
Gal_utc_model.A0_6 = A0_6;
Gal_utc_model.A1_6 = A1_6;
Gal_utc_model.Delta_tLS_6 = Delta_tLS_6;
Gal_utc_model.t0t_6 = t0t_6;
Gal_utc_model.WNot_6 = WNot_6;
Gal_utc_model.WN_LSF_6 = WN_LSF_6;
Gal_utc_model.DN_6 = DN_6;
Gal_utc_model.Delta_tLSF_6 = Delta_tLSF_6;
/*GST
//Gal_utc_model.WN_5 = WN_5; //Week number
//Gal_utc_model.TOW_5 = WN_5; //Time of Week
return Gal_utc_model;
}*/
void Galileo_Navigation_Message::satellitePosition(double transmitTime) //when this function in used, the input must be the transmitted time (t) in second computed by Galileo_System_Time (above function)
@ -1175,13 +1176,18 @@ void Galileo_Navigation_Message::satellitePosition(double transmitTime) //when t
galileo_satpos_Y = cos(u) * r * sin(Omega) + sin(u) * r * cos(i) * cos(Omega); //***********************NOTE: in GALILEO ICD this expression is not correct because it has minus (- sin(u) * r * cos(i) * cos(Omega)) instead of plus
galileo_satpos_Z = sin(u) * r * sin(i);
std::cout << "Galileo satellite position X [m]: " << galileo_satpos_X << std::endl;
std::cout << "Galileo satellite position Y [m]: " << galileo_satpos_Y << std::endl;
std::cout << "Galileo satellite position Z [m]: " << galileo_satpos_Z << std::endl;
double vector_position = sqrt(galileo_satpos_X*galileo_satpos_X + galileo_satpos_Y*galileo_satpos_Y + galileo_satpos_Z*galileo_satpos_Z);
std::cout << "Vector Earth Center-Satellite [Km]: " << vector_position/1000 << std::endl;
// Satellite's velocity. Can be useful for Vector Tracking loops
double Omega_dot = OMEGA_dot_3 - GALILEO_OMEGA_EARTH_DOT;
galileo_satvel_X = - Omega_dot * (cos(u) * r + sin(u) * r * cos(i)) + galileo_satpos_X * cos(Omega) - galileo_satpos_Y * cos(i) * sin(Omega);
galileo_satvel_Y = Omega_dot * (cos(u) * r * cos(Omega) - sin(u) * r * cos(i) * sin(Omega)) + galileo_satpos_X * sin(Omega) + galileo_satpos_Y * cos(i) * cos(Omega);
galileo_satvel_Z = galileo_satpos_Y * sin(i);
}
@ -1215,7 +1221,7 @@ double Galileo_Navigation_Message::Galileo_System_Time(double WN, double TOW){
double t=0;
double sec_in_day = 86400;
double day_in_week = 7;
t = WN*sec_in_day*day_in_week+ TOW; // second from the origin of the Galileo time
t = WN * sec_in_day * day_in_week + TOW; // second from the origin of the Galileo time
return t;
@ -1286,7 +1292,7 @@ double Galileo_Navigation_Message::sv_clock_relativistic_term(double transmitTim
return Galileo_dtr;
}
double Galileo_Navigation_Message::GST_to_UTC_time(double t_e, int WN)
double Galileo_Navigation_Message::GST_to_UTC_time(double t_e, int WN) //t_e is GST (WN+TOW) in second
{
double t_Utc;
double t_Utc_daytime;

17
src/core/system_parameters/galileo_navigation_message.h
View File

@ -73,6 +73,21 @@ private:
public:
int flag_even_word;
bool flag_all_ephemeris; // flag indicating that all words containing ephemeris have been received
bool flag_ephemeris_1; // flag indicating that ephemeris 1/4 (word 1) have been received
bool flag_ephemeris_2; // flag indicating that ephemeris 2/4 (word 2) have been received
bool flag_ephemeris_3; // flag indicating that ephemeris 3/4 (word 3) have been received
bool flag_ephemeris_4; // flag indicating that ephemeris 4/4 (word 4) have been received
bool flag_iono_and_GST; // flag indicating that ionospheric and GST parameters (word 5) have been received
bool flag_utc_model; // flag indicating that utc model parameters (word 6) have been received
bool flag_all_almanac; // flag indicating that all almanac have been received
bool flag_almanac_1; // flag indicating that almanac 1/4 (word 7) have been received
bool flag_almanac_2; // flag indicating that almanac 2/4 (word 8) have been received
bool flag_almanac_3; // flag indicating that almanac 3/4 (word 9) have been received
bool flag_almanac_4; // flag indicating that almanac 4/4 (word 10) have been received
/*Word type 1: Ephemeris (1/4)*/
int IOD_nav_1; // IOD_nav page 1
double t0e_1; // Ephemeris reference time [s]
@ -243,7 +258,7 @@ public:
/*
* \brief Returns true if new Iono model has arrived. The flag is set to false when the function is executed
*/
bool have_new_iono();
bool have_new_iono_and_GST();
/*
* \brief Returns true if new UTC model has arrived. The flag is set to false when the function is executed
*/