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Added use of volk rotator in correlator.h

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This is considerably faster than generating a local carrier replica and
then doing a carrier wipeoff.
This commit is contained in:
Cillian O'Driscoll
2015-10-14 13:05:41 +01:00
parent 6ae11c58b0
commit 719642aa79
1 changed files with 22 additions and 4 deletions
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26
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc
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@@ -394,18 +394,36 @@ int Gps_L1_Ca_Dll_Pll_Tracking_cc::general_work (int noutput_items, gr_vector_in
// Generate local code and carrier replicas (using \hat{f}_d(k-1))
update_local_code();
update_local_carrier();
//update_local_carrier();
gr_complex phase_as_complex( std::cos( d_rem_carr_phase_rad ),
-std::sin( d_rem_carr_phase_rad ) );
double carrier_doppler_inc_rad = 2.0*M_PI*d_carrier_doppler_hz/d_fs_in;
gr_complex phase_inc_as_complex( std::cos( carrier_doppler_inc_rad ),
-std::sin( carrier_doppler_inc_rad ) );
// perform carrier wipe-off and compute Early, Prompt and Late correlation
d_correlator.Carrier_wipeoff_and_EPL_volk(d_current_prn_length_samples,
//d_correlator.Carrier_wipeoff_and_EPL_volk(d_current_prn_length_samples,
//in,
//d_carr_sign,
//d_early_code,
//d_prompt_code,
//d_late_code,
//d_Early,
//d_Prompt,
//d_Late);
d_correlator.Carrier_rotate_and_EPL_volk(d_current_prn_length_samples,
in,
d_carr_sign,
&phase_as_complex,
phase_inc_as_complex,
d_early_code,
d_prompt_code,
d_late_code,
d_Early,
d_Prompt,
d_Late);
d_Late );
// check for samples consistency (this should be done before in the receiver / here only if the source is a file)
if (std::isnan((*d_Prompt).real()) == true or std::isnan((*d_Prompt).imag()) == true ) // or std::isinf(in[i].real())==true or std::isinf(in[i].imag())==true)