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/* -*- c++ -*- */
/*
* Copyright 2006,2010,2011 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gr_pll_carriertracking_cc.h>
#include <gr_io_signature.h>
#include <gr_sincos.h>
#include <math.h>
#include <gr_math.h>
#ifndef M_TWOPI
#define M_TWOPI (2.0f*M_PI)
#endif
gr_pll_carriertracking_cc_sptr
gr_make_pll_carriertracking_cc (float loop_bw, float max_freq, float min_freq)
{
return gnuradio::get_initial_sptr(new gr_pll_carriertracking_cc (loop_bw, max_freq, min_freq));
}
gr_pll_carriertracking_cc::gr_pll_carriertracking_cc (float loop_bw,
float max_freq,
float min_freq)
: gr_sync_block ("pll_carriertracking_cc",
gr_make_io_signature (1, 1, sizeof (gr_complex)),
gr_make_io_signature (1, 1, sizeof (gr_complex))),
gri_control_loop(loop_bw, max_freq, min_freq),
d_locksig(0), d_lock_threshold(0), d_squelch_enable(false)
{
}
float
gr_pll_carriertracking_cc::mod_2pi (float in)
{
if(in>M_PI)
return in-M_TWOPI;
else if(in<-M_PI)
return in+M_TWOPI;
else
return in;
}
float
gr_pll_carriertracking_cc::phase_detector(gr_complex sample,float ref_phase)
{
float sample_phase;
// sample_phase = atan2(sample.imag(),sample.real());
sample_phase = gr_fast_atan2f(sample.imag(),sample.real());
return mod_2pi(sample_phase-ref_phase);
}
bool
gr_pll_carriertracking_cc::lock_detector(void)
{
return (fabsf(d_locksig) > d_lock_threshold);
}
bool
gr_pll_carriertracking_cc::squelch_enable(bool set_squelch)
{
return d_squelch_enable = set_squelch;
}
float
gr_pll_carriertracking_cc::set_lock_threshold(float threshold)
{
return d_lock_threshold = threshold;
}
int
gr_pll_carriertracking_cc::work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const gr_complex *iptr = (gr_complex *) input_items[0];
gr_complex *optr = (gr_complex *) output_items[0];
float error;
float t_imag, t_real;
for (int i = 0; i < noutput_items; i++){
gr_sincosf(d_phase, &t_imag, &t_real);
optr[i] = iptr[i] * gr_complex(t_real, -t_imag);
error = phase_detector(iptr[i],d_phase);
advance_loop(error);
phase_wrap();
frequency_limit();
d_locksig = d_locksig * (1.0 - d_alpha) + \
d_alpha*(iptr[i].real() * t_real + iptr[i].imag() * t_imag);
if ((d_squelch_enable) && !lock_detector())
optr[i] = 0;
}
return noutput_items;
}
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