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Added two Carrier_rotate correlator utilities

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1) Carrier_rotate_and_EPL_volk

This is a very efficient VOLK based carrier wipeoff and
Early/Prompt/Late correlation. The carrier wipe off is done using the
VOLK rotator functions, which means there is no need to generate a local
replica sinusoid.

2) Carrier_rotate_and_VEPL_Volk

This adds Very Early/Early/Prompt/Late/Very Late correlation with the
VOLK rotator implementation of carrier wipe-off
This commit is contained in:
Cillian O'Driscoll
2015-11-26 13:15:56 +00:00
parent e6d5fe35ea
commit b95219dbc6
2 changed files with 73 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
src/algorithms/tracking/libs/correlator.cc
View File

@@ -151,3 +151,50 @@ void Correlator::Carrier_wipeoff_and_EPL_volk_custom(int signal_length_samples,
volk_cw_epl_corr_u(input, carrier, E_code, P_code, L_code, E_out, P_out, L_out, signal_length_samples);
}
#endif
void Correlator::Carrier_rotate_and_EPL_volk(int signal_length_samples,
const gr_complex* input,
gr_complex *phase_as_complex,
gr_complex phase_inc_as_complex,
const gr_complex* E_code,
const gr_complex* P_code,
const gr_complex* L_code,
gr_complex* E_out,
gr_complex* P_out,
gr_complex* L_out )
{
gr_complex* bb_signal = static_cast<gr_complex*>(volk_malloc(signal_length_samples * sizeof(gr_complex), volk_get_alignment()));
volk_32fc_s32fc_x2_rotator_32fc(bb_signal, input, phase_inc_as_complex, phase_as_complex, signal_length_samples);
volk_32fc_x2_dot_prod_32fc(E_out, bb_signal, E_code, signal_length_samples);
volk_32fc_x2_dot_prod_32fc(P_out, bb_signal, P_code, signal_length_samples);
volk_32fc_x2_dot_prod_32fc(L_out, bb_signal, L_code, signal_length_samples);
volk_free(bb_signal);
}
void Correlator::Carrier_rotate_and_VEPL_volk(int signal_length_samples,
const gr_complex* input,
gr_complex *phase_as_complex,
gr_complex phase_inc_as_complex,
const gr_complex* VE_code,
const gr_complex* E_code,
const gr_complex* P_code,
const gr_complex* L_code,
const gr_complex* VL_code,
gr_complex* VE_out,
gr_complex* E_out,
gr_complex* P_out,
gr_complex* L_out,
gr_complex* VL_out )
{
gr_complex* bb_signal = static_cast<gr_complex*>(volk_malloc(signal_length_samples * sizeof(gr_complex), volk_get_alignment()));
volk_32fc_s32fc_x2_rotator_32fc(bb_signal, input, phase_inc_as_complex, phase_as_complex, signal_length_samples);
volk_32fc_x2_dot_prod_32fc(VE_out, bb_signal, VE_code, signal_length_samples);
volk_32fc_x2_dot_prod_32fc(E_out, bb_signal, E_code, signal_length_samples);
volk_32fc_x2_dot_prod_32fc(P_out, bb_signal, P_code, signal_length_samples);
volk_32fc_x2_dot_prod_32fc(L_out, bb_signal, L_code, signal_length_samples);
volk_32fc_x2_dot_prod_32fc(VL_out, bb_signal, VL_code, signal_length_samples);
volk_free(bb_signal);
}

26
src/algorithms/tracking/libs/correlator.h
View File

@@ -67,6 +67,32 @@ public:
void Carrier_wipeoff_and_EPL_volk_custom(int signal_length_samples, const gr_complex* input, gr_complex* carrier, gr_complex* E_code, gr_complex* P_code, gr_complex* L_code, gr_complex* E_out, gr_complex* P_out, gr_complex* L_out);
#endif
void Carrier_rotate_and_EPL_volk(int signal_length_samples,
const gr_complex* input,
gr_complex *phase_as_complex,
gr_complex phase_inc_as_complex,
const gr_complex* E_code,
const gr_complex* P_code,
const gr_complex* L_code,
gr_complex* E_out,
gr_complex* P_out,
gr_complex* L_out );
void Carrier_rotate_and_VEPL_volk(int signal_length_samples,
const gr_complex* input,
gr_complex *phase_as_complex,
gr_complex phase_inc_as_complex,
const gr_complex* VE_code,
const gr_complex* E_code,
const gr_complex* P_code,
const gr_complex* L_code,
const gr_complex* VL_code,
gr_complex* VE_out,
gr_complex* E_out,
gr_complex* P_out,
gr_complex* L_out,
gr_complex* VL_out );
private:
unsigned long next_power_2(unsigned long v);
};