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bugfix: Fixes bugs with units in GNAV Almanac decoding

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Forces conversion of semicircles to radians units  in some GNAV Almanac
parameters. In addition, adds safeguards in code to avoid invalid
slot number identification.
This commit is contained in:
Damian Miralles 2017-09-20 08:42:01 -06:00 committed by Carles Fernandez
parent c4c90dcad2
commit d8f697401e
3 changed files with 89 additions and 78 deletions
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15
conf/gnss-sdr_GLONASS_L1_CA_ibyte.conf
View File

@ -25,20 +25,15 @@ Resampler.sample_freq_out=6625000
Resampler.item_type=gr_complex Resampler.item_type=gr_complex
;######### CHANNELS GLOBAL CONFIG ############ ;######### CHANNELS GLOBAL CONFIG ############
Channel.signal=1G
Channels.in_acquisition=1
Channels_1G.count=5 Channels_1G.count=5
Channels.in_acquisition=5
Channel0.signal=1G
Channel1.signal=1G
Channel2.signal=1G
Channel3.signal=1G
Channel4.signal=1G
Channel0.satellite=11 Channel0.satellite=11
Channel1.satellite=2 Channel1.satellite=2
Channel2.satellite=18 Channel2.satellite=18
Channel3.satellite=12 Channel3.satellite=12
Channel4.satellite=21 Channel4.satellite=21
; Possible list includes 2, 12, 21, 22
;######### ACQUISITION GLOBAL CONFIG ############ ;######### ACQUISITION GLOBAL CONFIG ############
Acquisition_1G.implementation=GLONASS_L1_CA_PCPS_Acquisition Acquisition_1G.implementation=GLONASS_L1_CA_PCPS_Acquisition
@ -53,9 +48,9 @@ Acquisition_1G.dump_filename=/archive/glo_acquisition.dat
;Acquisition_1G.coherent_integration_time_ms=10 ;Acquisition_1G.coherent_integration_time_ms=10
;######### TRACKING GLOBAL CONFIG ############ ;######### TRACKING GLOBAL CONFIG ############
Tracking_1G.implementation=GLONASS_L1_CA_DLL_PLL_C_Aid_Tracking Tracking_1G.implementation=GLONASS_L1_CA_DLL_PLL_Tracking
Tracking_1G.item_type=gr_complex Tracking_1G.item_type=gr_complex
Tracking_1G.if=1 Tracking_1G.if=0
Tracking_1G.early_late_space_chips=0.5 Tracking_1G.early_late_space_chips=0.5
Tracking_1G.pll_bw_hz=25.0; Tracking_1G.pll_bw_hz=25.0;
Tracking_1G.dll_bw_hz=3.0; Tracking_1G.dll_bw_hz=3.0;
@ -63,7 +58,7 @@ Tracking_1G.dump=true;
Tracking_1G.dump_filename=/archive/glo_tracking_ch_ Tracking_1G.dump_filename=/archive/glo_tracking_ch_
;######### TELEMETRY DECODER GPS CONFIG ############ ;######### TELEMETRY DECODER GPS CONFIG ############
TelemetryDecoder_1G.implementation=GPS_L1_CA_Telemetry_Decoder TelemetryDecoder_1G.implementation=GLONASS_L1_CA_Telemetry_Decoder
;######### OBSERVABLES CONFIG ############ ;######### OBSERVABLES CONFIG ############
Observables.implementation=Hybrid_Observables Observables.implementation=Hybrid_Observables

3
src/algorithms/telemetry_decoder/gnuradio_blocks/glonass_l1_ca_telemetry_decoder_cc.cc
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@ -200,6 +200,7 @@ void glonass_l1_ca_telemetry_decoder_cc::decode_string(double *frame_symbols,int
// get object for this SV (mandatory) // get object for this SV (mandatory)
std::shared_ptr<Glonass_Gnav_Ephemeris> tmp_obj = std::make_shared<Glonass_Gnav_Ephemeris>(d_nav.get_ephemeris()); std::shared_ptr<Glonass_Gnav_Ephemeris> tmp_obj = std::make_shared<Glonass_Gnav_Ephemeris>(d_nav.get_ephemeris());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj)); this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
LOG(INFO) << "GLONASS GNAV Ephemeris have been received on channel" << d_channel << " from satellite " << d_satellite;
} }
if (d_nav.have_new_utc_model() == true) if (d_nav.have_new_utc_model() == true)
@ -207,12 +208,14 @@ void glonass_l1_ca_telemetry_decoder_cc::decode_string(double *frame_symbols,int
// get object for this SV (mandatory) // get object for this SV (mandatory)
std::shared_ptr<Glonass_Gnav_Utc_Model> tmp_obj = std::make_shared<Glonass_Gnav_Utc_Model>(d_nav.get_utc_model()); std::shared_ptr<Glonass_Gnav_Utc_Model> tmp_obj = std::make_shared<Glonass_Gnav_Utc_Model>(d_nav.get_utc_model());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj)); this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
LOG(INFO) << "GLONASS GNAV UTC Model have been received on channel" << d_channel << " from satellite " << d_satellite;
} }
if (d_nav.have_new_almanac() == true) if (d_nav.have_new_almanac() == true)
{ {
unsigned int slot_nbr = d_nav.i_alm_satellite_slot_number; unsigned int slot_nbr = d_nav.i_alm_satellite_slot_number;
std::shared_ptr<Glonass_Gnav_Almanac> tmp_obj= std::make_shared<Glonass_Gnav_Almanac>(d_nav.get_almanac(slot_nbr)); std::shared_ptr<Glonass_Gnav_Almanac> tmp_obj= std::make_shared<Glonass_Gnav_Almanac>(d_nav.get_almanac(slot_nbr));
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj)); this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
LOG(INFO) << "GLONASS GNAV Almanac have been received on channel" << d_channel << " in slot number " << slot_nbr;
} }
// 5. Update satellite information on system // 5. Update satellite information on system
if(d_nav.flag_update_slot_number == true) if(d_nav.flag_update_slot_number == true)

149
src/core/system_parameters/glonass_gnav_navigation_message.cc
View File

@ -385,86 +385,97 @@ int Glonass_Gnav_Navigation_Message::string_decoder(std::string frame_string)
case 3: case 3:
// --- It is string 3 ---------------------------------------------- // --- It is string 3 ----------------------------------------------
gnav_ephemeris.d_P_3 = static_cast<bool>(read_navigation_bool(string_bits, P3)); if (flag_ephemeris_str_2 == true)
gnav_ephemeris.d_gamma_n = static_cast<double>(read_navigation_signed(string_bits, GAMMA_N)) * TWO_N40; {
gnav_ephemeris.d_P = static_cast<double>(read_navigation_unsigned(string_bits, P)); gnav_ephemeris.d_P_3 = static_cast<bool>(read_navigation_bool(string_bits, P3));
gnav_ephemeris.d_l3rd_n = static_cast<bool>(read_navigation_bool(string_bits, EPH_L_N)); gnav_ephemeris.d_gamma_n = static_cast<double>(read_navigation_signed(string_bits, GAMMA_N)) * TWO_N40;
gnav_ephemeris.d_VZn = static_cast<double>(read_navigation_signed(string_bits, Z_N_DOT)) * TWO_N20; gnav_ephemeris.d_P = static_cast<double>(read_navigation_unsigned(string_bits, P));
gnav_ephemeris.d_AZn = static_cast<double>(read_navigation_signed(string_bits, Z_N_DOT_DOT)) * TWO_N30; gnav_ephemeris.d_l3rd_n = static_cast<bool>(read_navigation_bool(string_bits, EPH_L_N));
gnav_ephemeris.d_Zn = static_cast<double>(read_navigation_signed(string_bits, Z_N)) * TWO_N11; gnav_ephemeris.d_VZn = static_cast<double>(read_navigation_signed(string_bits, Z_N_DOT)) * TWO_N20;
gnav_ephemeris.d_AZn = static_cast<double>(read_navigation_signed(string_bits, Z_N_DOT_DOT)) * TWO_N30;
gnav_ephemeris.d_Zn = static_cast<double>(read_navigation_signed(string_bits, Z_N)) * TWO_N11;
flag_ephemeris_str_3 = true; flag_ephemeris_str_3 = true;
}
break; break;
case 4: case 4:
// --- It is string 4 ---------------------------------------------- // --- It is string 4 ----------------------------------------------
gnav_ephemeris.d_tau_n = static_cast<double>(read_navigation_signed(string_bits, TAU_N)) * TWO_N30; if (flag_ephemeris_str_3 == true)
gnav_ephemeris.d_Delta_tau_n = static_cast<double>(read_navigation_signed(string_bits, DELTA_TAU_N)) * TWO_N30; {
gnav_ephemeris.d_E_n = static_cast<double>(read_navigation_unsigned(string_bits, E_N)); gnav_ephemeris.d_tau_n = static_cast<double>(read_navigation_signed(string_bits, TAU_N)) * TWO_N30;
gnav_ephemeris.d_P_4 = static_cast<bool>(read_navigation_bool(string_bits, P4)); gnav_ephemeris.d_Delta_tau_n = static_cast<double>(read_navigation_signed(string_bits, DELTA_TAU_N)) * TWO_N30;
gnav_ephemeris.d_F_T = static_cast<double>(read_navigation_unsigned(string_bits, F_T)); gnav_ephemeris.d_E_n = static_cast<double>(read_navigation_unsigned(string_bits, E_N));
gnav_ephemeris.d_N_T = static_cast<double>(read_navigation_unsigned(string_bits, N_T)); gnav_ephemeris.d_P_4 = static_cast<bool>(read_navigation_bool(string_bits, P4));
gnav_ephemeris.d_n = static_cast<double>(read_navigation_unsigned(string_bits, N)); gnav_ephemeris.d_F_T = static_cast<double>(read_navigation_unsigned(string_bits, F_T));
gnav_ephemeris.d_M = static_cast<double>(read_navigation_unsigned(string_bits, M)); gnav_ephemeris.d_N_T = static_cast<double>(read_navigation_unsigned(string_bits, N_T));
gnav_ephemeris.d_n = static_cast<double>(read_navigation_unsigned(string_bits, N));
gnav_ephemeris.d_M = static_cast<double>(read_navigation_unsigned(string_bits, M));
// Fill in ephemeris deliverables in the code // Fill in ephemeris deliverables in the code
flag_update_slot_number = true; flag_update_slot_number = true;
gnav_ephemeris.i_satellite_slot_number = static_cast<unsigned int>(gnav_ephemeris.d_n); gnav_ephemeris.i_satellite_slot_number = static_cast<unsigned int>(gnav_ephemeris.d_n);
gnav_ephemeris.i_satellite_PRN = static_cast<unsigned int>(gnav_ephemeris.d_n); gnav_ephemeris.i_satellite_PRN = static_cast<unsigned int>(gnav_ephemeris.d_n);
flag_ephemeris_str_4 = true; flag_ephemeris_str_4 = true;
}
break; break;
case 5: case 5:
// --- It is string 5 ---------------------------------------------- // --- It is string 5 ----------------------------------------------
gnav_utc_model.d_N_A = static_cast<double>(read_navigation_unsigned(string_bits, N_A));
gnav_utc_model.d_tau_c = static_cast<double>(read_navigation_signed(string_bits, TAU_C)) * TWO_N31;
gnav_utc_model.d_N_4 = static_cast<double>(read_navigation_unsigned(string_bits, N_4));
gnav_utc_model.d_tau_gps = static_cast<double>(read_navigation_signed(string_bits, TAU_GPS)) * TWO_N30;
gnav_ephemeris.d_l5th_n = static_cast<bool>(read_navigation_bool(string_bits, ALM_L_N));
flag_utc_model_str_5 = true;
// Compute Year and DoY based on Algorithm A3.11 of GLONASS ICD
if (flag_ephemeris_str_4 == true) if (flag_ephemeris_str_4 == true)
{ {
//Current year number J in the four-year interval is calculated: gnav_utc_model.d_N_A = static_cast<double>(read_navigation_unsigned(string_bits, N_A));
gnav_utc_model.d_tau_c = static_cast<double>(read_navigation_signed(string_bits, TAU_C)) * TWO_N31;
gnav_utc_model.d_N_4 = static_cast<double>(read_navigation_unsigned(string_bits, N_4));
gnav_utc_model.d_tau_gps = static_cast<double>(read_navigation_signed(string_bits, TAU_GPS)) * TWO_N30;
gnav_ephemeris.d_l5th_n = static_cast<bool>(read_navigation_bool(string_bits, ALM_L_N));
flag_utc_model_str_5 = true;
// Compute Year and DoY based on Algorithm A3.11 of GLONASS ICD
// 1). Current year number J in the four-year interval is calculated
if (gnav_ephemeris.d_N_T >= 1 && gnav_ephemeris.d_N_T <= 366) if (gnav_ephemeris.d_N_T >= 1 && gnav_ephemeris.d_N_T <= 366)
{ {
J = 1; J = 1;
} }
else if (gnav_ephemeris.d_N_T >= 367 && gnav_ephemeris.d_N_T <= 731) else if (gnav_ephemeris.d_N_T >= 367 && gnav_ephemeris.d_N_T <= 731)
{ {
J = 2; J = 2;
} }
else if (gnav_ephemeris.d_N_T >= 732 && gnav_ephemeris.d_N_T <= 1096) else if (gnav_ephemeris.d_N_T >= 732 && gnav_ephemeris.d_N_T <= 1096)
{ {
J = 3; J = 3;
} }
else if (gnav_ephemeris.d_N_T >= 1097 && gnav_ephemeris.d_N_T <= 1461) else if (gnav_ephemeris.d_N_T >= 1097 && gnav_ephemeris.d_N_T <= 1461)
{ {
J = 4; J = 4;
} }
// 2). Current year in common form is calculated by the following formula: // 2). Current year in common form is calculated by the following formula:
gnav_ephemeris.d_yr = 1996 + 4.0 * (gnav_utc_model.d_N_4 - 1.0) + (J - 1.0); gnav_ephemeris.d_yr = 1996 + 4.0 * (gnav_utc_model.d_N_4 - 1.0) + (J - 1.0);
gnav_ephemeris.d_tau_c = gnav_utc_model.d_tau_c; gnav_ephemeris.d_tau_c = gnav_utc_model.d_tau_c;
// 3). Set TOW once the year has been defined, it helps with leap second determination // 3). Set TOW once the year has been defined, it helps with leap second determination
if (flag_ephemeris_str_1 == true) if (flag_ephemeris_str_1 == true)
{ {
d_TOW = get_TOW(); d_TOW = get_TOW();
flag_TOW_set = true; flag_TOW_set = true;
}
}
} }
break; break;
case 6: case 6:
// --- It is string 6 ---------------------------------------------- // --- It is string 6 ----------------------------------------------
i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A)); i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A));
d_frame_ID = get_frame_number(i_alm_satellite_slot_number); d_frame_ID = get_frame_number(i_alm_satellite_slot_number);
// Make sure a valid frame_ID or satellite slot number is returned
if(d_frame_ID == 0)
return 0;
gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N)); gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N));
gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A)); gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A));
@ -510,6 +521,9 @@ int Glonass_Gnav_Navigation_Message::string_decoder(std::string frame_string)
// --- It is string 8 ---------------------------------------------- // --- It is string 8 ----------------------------------------------
i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A)); i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A));
d_frame_ID = get_frame_number(i_alm_satellite_slot_number); d_frame_ID = get_frame_number(i_alm_satellite_slot_number);
// Make sure a valid frame_ID or satellite slot number is returned
if(d_frame_ID == 0)
return 0;
gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N)); gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N));
gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A)); gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A));
@ -548,6 +562,9 @@ int Glonass_Gnav_Navigation_Message::string_decoder(std::string frame_string)
// --- It is string 10 --------------------------------------------- // --- It is string 10 ---------------------------------------------
i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A)); i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A));
d_frame_ID = get_frame_number(i_alm_satellite_slot_number); d_frame_ID = get_frame_number(i_alm_satellite_slot_number);
// Make sure a valid frame_ID or satellite slot number is returned
if(d_frame_ID == 0)
return 0;
gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N)); gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N));
gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A)); gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A));
@ -587,7 +604,9 @@ int Glonass_Gnav_Navigation_Message::string_decoder(std::string frame_string)
// --- It is string 12 --------------------------------------------- // --- It is string 12 ---------------------------------------------
i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A)); i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A));
d_frame_ID = get_frame_number(i_alm_satellite_slot_number); d_frame_ID = get_frame_number(i_alm_satellite_slot_number);
// Make sure a valid frame_ID or satellite slot number is returned
if(d_frame_ID == 0)
return 0;
gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N)); gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N));
gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A)); gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A));
gnav_almanac[i_alm_satellite_slot_number - 1].d_n_A = static_cast<double>(read_navigation_unsigned(string_bits, n_A)); gnav_almanac[i_alm_satellite_slot_number - 1].d_n_A = static_cast<double>(read_navigation_unsigned(string_bits, n_A));
@ -633,7 +652,9 @@ int Glonass_Gnav_Navigation_Message::string_decoder(std::string frame_string)
{ {
i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A)); i_alm_satellite_slot_number = static_cast<unsigned int>(read_navigation_unsigned(string_bits, n_A));
d_frame_ID = get_frame_number(i_alm_satellite_slot_number); d_frame_ID = get_frame_number(i_alm_satellite_slot_number);
// Make sure a valid frame_ID or satellite slot number is returned
if(d_frame_ID == 0)
return 0;
gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N)); gnav_almanac[i_alm_satellite_slot_number - 1].d_C_n = static_cast<bool>(read_navigation_bool(string_bits, C_N));
gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A)); gnav_almanac[i_alm_satellite_slot_number - 1].d_M_n_A = static_cast<double>(read_navigation_unsigned(string_bits, M_N_A));
gnav_almanac[i_alm_satellite_slot_number - 1].d_n_A = static_cast<double>(read_navigation_unsigned(string_bits, n_A)); gnav_almanac[i_alm_satellite_slot_number - 1].d_n_A = static_cast<double>(read_navigation_unsigned(string_bits, n_A));
@ -644,12 +665,10 @@ int Glonass_Gnav_Navigation_Message::string_decoder(std::string frame_string)
flag_almanac_str_14 = true; flag_almanac_str_14 = true;
} }
break; break;
case 15: case 15:
// --- It is string 9 ---------------------------------------------- // --- It is string 15 ----------------------------------------------
if (d_frame_ID != 5 and flag_almanac_str_14 == true) { if (d_frame_ID != 5 and flag_almanac_str_14 == true) {
gnav_almanac[i_alm_satellite_slot_number - 1].d_omega_n_A = static_cast<double>(read_navigation_signed(string_bits, OMEGA_N_A)) * TWO_N15 * GLONASS_PI; gnav_almanac[i_alm_satellite_slot_number - 1].d_omega_n_A = static_cast<double>(read_navigation_signed(string_bits, OMEGA_N_A)) * TWO_N15 * GLONASS_PI;
gnav_almanac[i_alm_satellite_slot_number - 1].d_t_lambda_n_A = static_cast<double>(read_navigation_unsigned(string_bits, T_LAMBDA_N_A)) * TWO_N5; gnav_almanac[i_alm_satellite_slot_number - 1].d_t_lambda_n_A = static_cast<double>(read_navigation_unsigned(string_bits, T_LAMBDA_N_A)) * TWO_N5;
@ -711,23 +730,17 @@ Glonass_Gnav_Almanac Glonass_Gnav_Navigation_Message::get_almanac(unsigned int s
bool Glonass_Gnav_Navigation_Message::have_new_ephemeris() //Check if we have a new ephemeris stored in the galileo navigation class bool Glonass_Gnav_Navigation_Message::have_new_ephemeris() //Check if we have a new ephemeris stored in the galileo navigation class
{ {
if ((flag_ephemeris_str_1 == true) and (flag_ephemeris_str_2 == true) and (flag_ephemeris_str_3 == true) and (flag_ephemeris_str_4 == true)) // We need to make sure we have received the ephemeris info plus the time info
if ((flag_ephemeris_str_1 == true) and (flag_ephemeris_str_2 == true) and
(flag_ephemeris_str_3 == true) and (flag_ephemeris_str_4 == true) and
(flag_utc_model_str_5 == true))
{ {
if (gnav_ephemeris.d_P_4 == 1) flag_ephemeris_str_1 = false;// clear the flag
{ flag_ephemeris_str_2 = false;// clear the flag
flag_ephemeris_str_1 = false;// clear the flag flag_ephemeris_str_3 = false;// clear the flag
flag_ephemeris_str_2 = false;// clear the flag flag_ephemeris_str_4 = false;// clear the flag
flag_ephemeris_str_3 = false;// clear the flag flag_all_ephemeris = true;
flag_ephemeris_str_4 = false;// clear the flag DLOG(INFO) << "GLONASS GNAV Ephemeris (1, 2, 3, 4) have been received and belong to the same batch" << std::endl;
flag_all_ephemeris = true;
DLOG(INFO) << "Ephemeris (1, 2, 3, 4) have been received and belong to the same batch" << std::endl;
return true;
}
else
{
return false;
}
} }
else else
return false; return false;