/*!
 * \file gps_l1_ca_dll_fll_pll_tracking_cc.cc
 * \brief Implementation of a code DLL + carrier FLL/PLL tracking block
 * \author Javier Arribas, 2011. jarribas(at)cttc.es
 *
 * This file implements the code Delay Locked Loop (DLL) + carrier
 * Phase Locked Loop (PLL) helped with a carrier Frequency Locked Loop (FLL)
 * according to the algorithms described in:
 * E.D. Kaplan and C. Hegarty, Understanding GPS. Principles and
 * Applications, Second Edition, Artech House Publishers, 2005.
 *
 * -------------------------------------------------------------------------
 *
 * Copyright (C) 2010-2011  (see AUTHORS file for a list of contributors)
 *
 * GNSS-SDR is a software defined Global Navigation
 *          Satellite Systems receiver
 *
 * This file is part of GNSS-SDR.
 *
 * GNSS-SDR 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 of the License, or
 * at your option) any later version.
 *
 * GNSS-SDR 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 GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
 *
 * -------------------------------------------------------------------------
 */

#include "gps_l1_ca_dll_fll_pll_tracking_cc.h"
#include "gps_sdr_signal_processing.h"
#include "GPS_L1_CA.h"
#include "tracking_discriminators.h"
#include "CN_estimators.h"
#include "tracking_FLL_PLL_filter.h"
#include "control_message_factory.h"
#include "gnss_flowgraph.h"
#include <boost/lexical_cast.hpp>
#include <iostream>
#include <sstream>
#include <cmath>
#include "math.h"
#include <gnuradio/gr_io_signature.h>
#include <glog/log_severity.h>
#include <glog/logging.h>

/*!
 * \todo Include in definition header file
 */
#define CN0_ESTIMATION_SAMPLES 10
#define MINIMUM_VALID_CN0 25
#define MAXIMUM_LOCK_FAIL_COUNTER 200

using google::LogMessage;

gps_l1_ca_dll_fll_pll_tracking_cc_sptr
gps_l1_ca_dll_fll_pll_make_tracking_cc(unsigned int satellite, long if_freq, long fs_in, unsigned
        int vector_length, gr_msg_queue_sptr queue, bool dump, std::string dump_filename, int order,
        float fll_bw_hz, float pll_bw_hz, float dll_bw_hz, float early_late_space_chips)
{

    return gps_l1_ca_dll_fll_pll_tracking_cc_sptr(new Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc(satellite, if_freq,
            fs_in, vector_length, queue, dump, dump_filename, order, fll_bw_hz, pll_bw_hz,dll_bw_hz,
            early_late_space_chips));
}




void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
    ninput_items_required[0] = d_vector_length*2; //set the required available samples in each call
}




Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc(unsigned int satellite,
        long if_freq, long fs_in, unsigned int vector_length, gr_msg_queue_sptr queue, bool dump,
        std::string dump_filename, int order, float fll_bw_hz, float pll_bw_hz, float dll_bw_hz,
        float early_late_space_chips) :
        gr_block ("Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc", gr_make_io_signature (1, 1, sizeof(gr_complex)),
                gr_make_io_signature(5, 5, sizeof(double)))
{
    //gr_sync_decimator ("gps_l1_ca_dll_pll_tracking_cc", gr_make_io_signature (1, 1, sizeof(gr_complex)),
    //		gr_make_io_signature(3, 3, sizeof(float)),vector_length) {
    // initialize internal vars
    d_queue = queue;
    d_dump = dump;
    d_satellite = satellite;
    d_if_freq = if_freq;
    d_fs_in = fs_in;
    d_vector_length = vector_length;
    d_early_late_spc_chips = early_late_space_chips; // Define early-late offset (in chips)
    d_dump_filename = dump_filename;

    // Initialize tracking variables ==========================================
    d_carrier_loop_filter.set_params(fll_bw_hz,pll_bw_hz,order);

    // Get space for a vector with the C/A code replica sampled 1x/chip
    d_ca_code = new gr_complex[(int)GPS_L1_CA_CODE_LENGTH_CHIPS+2];
    // Get space for the resampled early / prompt / late local replicas
    d_early_code = new gr_complex[d_vector_length*2];
    d_prompt_code = new gr_complex[d_vector_length*2];
    d_late_code = new gr_complex[d_vector_length*2];
    // space for carrier wipeoff LO vector
    d_carr_sign = new gr_complex[d_vector_length*2];

    // sample synchronization
    d_sample_counter = 0;
    d_sample_counter_seconds = 0;
    d_acq_sample_stamp = 0;
    d_last_seg = 0;// this is for debug output only

    d_enable_tracking = false;

    d_current_prn_length_samples = (int)d_vector_length;

    // CN0 estimation and lock detector buffers
    d_cn0_estimation_counter = 0;
    d_Prompt_buffer = new gr_complex[CN0_ESTIMATION_SAMPLES];
    d_carrier_lock_test = 1;
    d_CN0_SNV_dB_Hz = 0;
    d_carrier_lock_fail_counter = 0;
    d_carrier_lock_threshold = 5;

}




void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::start_tracking()
{
    /*
     *  correct the code phase according to the delay between acq and trk
     */
    unsigned long int acq_trk_diff_samples;
    float acq_trk_diff_seconds;
    acq_trk_diff_samples = d_sample_counter - d_acq_sample_stamp;//-d_vector_length;
    acq_trk_diff_seconds = (float)acq_trk_diff_samples / (float)d_fs_in;
    //doppler effect
    // Fd=(C/(C+Vr))*F
    float radial_velocity;
    radial_velocity = (GPS_L1_FREQ_HZ + d_acq_carrier_doppler_hz) / GPS_L1_FREQ_HZ;
    // new chip and prn sequence periods based on acq Doppler
    float T_chip_mod_seconds;
    float T_prn_mod_seconds;
    float T_prn_mod_samples;
    d_code_freq_hz = radial_velocity * GPS_L1_CA_CODE_RATE_HZ;
    T_chip_mod_seconds = 1 / d_code_freq_hz;
    T_prn_mod_seconds = T_chip_mod_seconds * GPS_L1_CA_CODE_LENGTH_CHIPS;
    T_prn_mod_samples = T_prn_mod_seconds * (float)d_fs_in;
    d_next_prn_length_samples = round(T_prn_mod_samples);

    float T_prn_true_seconds = GPS_L1_CA_CODE_LENGTH_CHIPS / GPS_L1_CA_CODE_RATE_HZ;
    float T_prn_true_samples = T_prn_true_seconds * (float)d_fs_in;
    float T_prn_diff_seconds;
    T_prn_diff_seconds = T_prn_true_seconds - T_prn_mod_seconds;
    float N_prn_diff;
    N_prn_diff = acq_trk_diff_seconds / T_prn_true_seconds;
    float corrected_acq_phase_samples, delay_correction_samples;
    corrected_acq_phase_samples = fmod((d_acq_code_phase_samples + T_prn_diff_seconds * N_prn_diff * (float)d_fs_in), T_prn_true_samples);

    if (corrected_acq_phase_samples < 0)
        {
            corrected_acq_phase_samples = T_prn_mod_samples + corrected_acq_phase_samples;
        }
    delay_correction_samples = d_acq_code_phase_samples - corrected_acq_phase_samples;
    d_acq_code_phase_samples = corrected_acq_phase_samples;

    d_carrier_doppler_hz = d_acq_carrier_doppler_hz;
    // DLL/PLL filter initialization
    d_carrier_loop_filter.initialize(d_acq_carrier_doppler_hz);
    d_FLL_wait = 1;

    // generate local reference ALWAYS starting at chip 1 (1 sample per chip)
    code_gen_conplex(&d_ca_code[1], d_satellite, 0);

    d_ca_code[0] = d_ca_code[(int)GPS_L1_CA_CODE_LENGTH_CHIPS];
    d_ca_code[(int)GPS_L1_CA_CODE_LENGTH_CHIPS + 1] = d_ca_code[1];

    d_carrier_lock_fail_counter = 0;
    d_Prompt_prev = 0;
    d_rem_code_phase_samples = 0;
    d_rem_carr_phase = 0;
    d_FLL_discriminator_hz = 0;
    d_rem_code_phase_samples = 0;
    d_next_rem_code_phase_samples = 0;
    d_acc_carrier_phase_rad = 0;

    d_code_phase_samples = d_acq_code_phase_samples;

    // DEBUG OUTPUT
    std::cout << "Tracking start on channel " << d_channel << " for satellite ID* " << this->d_satellite << std::endl;
    DLOG(INFO) << "Start tracking for satellite " << this->d_satellite << " received ";

    // enable tracking
    d_pull_in = true;
    d_enable_tracking = true;

    std::cout << "PULL-IN Doppler [Hz]= " << d_carrier_doppler_hz << " Code Phase correction [samples]=" << delay_correction_samples << " PULL-IN Code Phase [samples]= " << d_acq_code_phase_samples << std::endl;
}





void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::update_local_code()
{
    float tcode_chips;
    float rem_code_phase_chips;
    float code_phase_step_chips;
    int associated_chip_index;
    int code_length_chips = (int)GPS_L1_CA_CODE_LENGTH_CHIPS;
    code_phase_step_chips = d_code_freq_hz / ((float)d_fs_in);
    rem_code_phase_chips = d_rem_code_phase_samples * (d_code_freq_hz / d_fs_in);
    // unified loop for E, P, L code vectors
    tcode_chips = -rem_code_phase_chips;
    for (int i=0; i<d_current_prn_length_samples; i++)
        {
            associated_chip_index = 1 + round(fmod(tcode_chips - d_early_late_spc_chips, code_length_chips));
            d_early_code[i] = d_ca_code[associated_chip_index];
            associated_chip_index = 1 + round(fmod(tcode_chips, code_length_chips));
            d_prompt_code[i] = d_ca_code[associated_chip_index];
            associated_chip_index = 1 + round(fmod(tcode_chips + d_early_late_spc_chips, code_length_chips));
            d_late_code[i] = d_ca_code[associated_chip_index];
            tcode_chips = tcode_chips + code_phase_step_chips;
        }
    //d_code_phase_samples=d_code_phase_samples+(float)d_fs_in*GPS_L1_CA_CODE_LENGTH_CHIPS*(1/d_code_freq_hz-1/GPS_L1_CA_CODE_RATE_HZ);
}





void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::update_local_carrier()
{
    float phase, phase_step;
    phase_step = (float)TWO_PI * d_carrier_doppler_hz / (float)d_fs_in;
    phase = d_rem_carr_phase;
    for(int i = 0; i < d_current_prn_length_samples; i++)
        {
            d_carr_sign[i] = gr_complex(cos(phase), sin(phase));
            phase += phase_step;
        }
    d_rem_carr_phase = fmod(phase, TWO_PI);
    d_acc_carrier_phase_rad = d_acc_carrier_phase_rad + d_rem_carr_phase;
}





Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::~Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc()
{
    d_dump_file.close();
    delete[] d_ca_code;
    delete[] d_early_code;
    delete[] d_prompt_code;
    delete[] d_late_code;
    delete[] d_carr_sign;
    delete[] d_Prompt_buffer;
}



/* Tracking signal processing
 * Notice that this is a class derived from gr_sync_decimator, so each of the ninput_items has vector_length samples
 */

int Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::general_work (int noutput_items, gr_vector_int &ninput_items,
        gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
{
    //	if ((unsigned int)ninput_items[0]<(d_vector_length*2))
    //	{
    //		std::cout<<"End of signal detected\r\n";
    //		const int samples_available = ninput_items[0];
    //		consume_each(samples_available);
    //		return 0;
    //	}
    // process vars
    float code_error_chips = 0;
    float correlation_time_s = 0;
    float PLL_discriminator_hz = 0;
    float carr_nco_hz = 0;

    d_Prompt_prev = d_Prompt; // for the FLL discriminator
    d_Early  = gr_complex(0,0);
    d_Prompt = gr_complex(0,0);
    d_Late   = gr_complex(0,0);

    if (d_enable_tracking == true)
        {
            /*
             * Receiver signal alignment
             */
            if (d_pull_in == true)
                {
                    int samples_offset;

                    // 28/11/2011 ACQ to TRK transition BUG CORRECTION
                    float acq_trk_shif_correction_samples;
                    int acq_to_trk_delay_samples;
                    acq_to_trk_delay_samples = d_sample_counter-d_acq_sample_stamp;
                    acq_trk_shif_correction_samples = d_next_prn_length_samples - fmod((float)acq_to_trk_delay_samples, (float)d_next_prn_length_samples);
                    //std::cout<<"acq_trk_shif_correction="<<acq_trk_shif_correction_samples<<"\r\n";

                    samples_offset = round(d_acq_code_phase_samples + acq_trk_shif_correction_samples);
                    // /todo: Check if the sample counter sent to the next block as a time reference should be incremented AFTER sended or BEFORE
                    d_sample_counter_seconds = d_sample_counter_seconds + (((double)samples_offset)/(double)d_fs_in);
                    d_sample_counter = d_sample_counter + samples_offset; //count for the processed samples
                    d_pull_in = false;
                    //std::cout<<" samples_offset="<<samples_offset<<"\r\n";
                    consume_each(samples_offset); //shift input to perform alignment with local replica
                    return 1;
                }
            // get the sample in and out pointers
            const gr_complex* in = (gr_complex*) input_items[0]; //block input samples pointer
            double **out = (double **) &output_items[0]; //block output streams pointer

            // check for samples consistency (this should be done before in the receiver / here only if the source is a file)
            for(int i=0; i<d_current_prn_length_samples; i++)
                {
                    if (std::isnan(in[i].real()) == true or std::isnan(in[i].imag()) == true)// or std::isinf(in[i].real())==true or std::isinf(in[i].imag())==true)
                        {
                            const int samples_available = ninput_items[0];
                            d_sample_counter = d_sample_counter + samples_available;
                            LOG_AT_LEVEL(WARNING) << "Detected NaN samples at sample number " << d_sample_counter;
                            consume_each(samples_available);
                            return 0;
                        }
                }
            // Update the prn length based on code freq (variable) and
            // sampling frequency (fixed)
            // variable code PRN sample block size
            d_current_prn_length_samples = d_next_prn_length_samples;

            update_local_code();
            update_local_carrier();

            gr_complex bb_signal_sample(0,0);

            // perform Early, Prompt and Late correlation
            /*!
             * \todo Use SIMD-enabled correlators
             */
            for(int i=0; i<d_current_prn_length_samples; i++)
                {
                    //Perform the carrier wipe-off
                    bb_signal_sample = in[i] * d_carr_sign[i];
                    // Now get early, late, and prompt correlation values
                    d_Early += bb_signal_sample * d_early_code[i];
                    d_Prompt += bb_signal_sample * d_prompt_code[i];
                    d_Late += bb_signal_sample * d_late_code[i];
                }

            /*
             * DLL, FLL, and PLL discriminators
             */
            // Compute DLL error
            code_error_chips = dll_nc_e_minus_l_normalized(d_Early,d_Late);

            //compute FLL error
            correlation_time_s = ((float)d_current_prn_length_samples) / (float)d_fs_in;
            if (d_FLL_wait == 1)
                {
                    d_Prompt_prev = d_Prompt;
                    d_FLL_wait = 0;
                }
            else
                {
                    d_FLL_discriminator_hz = fll_four_quadrant_atan(d_Prompt_prev, d_Prompt, 0, correlation_time_s) / (float)TWO_PI;
                    d_Prompt_prev = d_Prompt;
                    d_FLL_wait = 1;
                }

            // Compute PLL error
            PLL_discriminator_hz = pll_cloop_two_quadrant_atan(d_Prompt)/(float)TWO_PI;

            /*!
             * \todo Update FLL assistance algorithm!
             */
            if (((float)d_sample_counter - (float)d_acq_sample_stamp)/(float)d_fs_in>3)
                {
                    d_FLL_discriminator_hz = 0; //disconnect the FLL after the initial lock
                }
            /*!
             * DLL and FLL+PLL filter and get current carrier Doppler and code frequency
             */
            carr_nco_hz = d_carrier_loop_filter.get_carrier_error(d_FLL_discriminator_hz, PLL_discriminator_hz, correlation_time_s);
            d_carrier_doppler_hz = (float)d_if_freq + carr_nco_hz;
            d_code_freq_hz = GPS_L1_CA_CODE_RATE_HZ - (((d_carrier_doppler_hz - (float)d_if_freq) * GPS_L1_CA_CODE_RATE_HZ) / GPS_L1_FREQ_HZ) - code_error_chips;

            /*!
             * \todo Improve the lock detection algorithm!
             */
            // ####### CN0 ESTIMATION AND LOCK DETECTORS ######
            if (d_cn0_estimation_counter < CN0_ESTIMATION_SAMPLES)
                {
                    // fill buffer with prompt correlator output values
                    d_Prompt_buffer[d_cn0_estimation_counter] = d_Prompt;
                    d_cn0_estimation_counter++;
                }
            else
                {
                    d_cn0_estimation_counter = 0;
                    d_CN0_SNV_dB_Hz = gps_l1_ca_CN0_SNV(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, d_fs_in);
                    d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES);
                    // ###### TRACKING UNLOCK NOTIFICATION #####
                    int tracking_message;
                    if (d_carrier_lock_test < d_carrier_lock_threshold or d_carrier_lock_test > MINIMUM_VALID_CN0)
                        {
                            d_carrier_lock_fail_counter++;
                        }
                    else
                        {
                            if (d_carrier_lock_fail_counter > 0) d_carrier_lock_fail_counter--;
                        }
                    if (d_carrier_lock_fail_counter > MAXIMUM_LOCK_FAIL_COUNTER)
                        {
                            std::cout << "Channel " << d_channel << " loss of lock!" << std::endl;
                            tracking_message = 3; //loss of lock
                            d_channel_internal_queue->push(tracking_message);
                            d_carrier_lock_fail_counter = 0;
                            d_enable_tracking = false; // TODO: check if disabling tracking is consistent with the channel state machine

                        }
                    //std::cout<<"d_carrier_lock_fail_counter"<<d_carrier_lock_fail_counter<<"\r\n";
                }

            /*!
             * \todo Output the CN0
             */
            // ########### Output the tracking data to navigation and PVT ##########
            // Output channel 0: Prompt correlator output Q
            *out[0] = (double)d_Prompt.real();
            // Output channel 1: Prompt correlator output I
            *out[1] = (double)d_Prompt.imag();
            // Output channel 2: PRN absolute delay [s]
            *out[2] = d_sample_counter_seconds;
            // Output channel 3: d_acc_carrier_phase_rad [rad]
            *out[3] = (double)d_acc_carrier_phase_rad;
            // Output channel 4: PRN code phase [s]
            *out[4] = (double)d_code_phase_samples * (1/(float)d_fs_in);

            // ########## DEBUG OUTPUT
            /*!
             *  \todo The stop timer has to be moved to the signal source!
             */
            // debug: Second counter in channel 0
            if (d_channel == 0)
                {
                    if (floor(d_sample_counter/d_fs_in) != d_last_seg)
                        {
                            d_last_seg = floor(d_sample_counter/d_fs_in);
                            std::cout << "Current input signal time=" << d_last_seg << " [s]" << std::endl;
                            std::cout << "Tracking CH "<< d_channel << " CN0=" << d_CN0_SNV_dB_Hz << " [dB-Hz]" << std::endl;
                            //std::cout<<"TRK CH "<<d_channel<<" Carrier_lock_test="<<d_carrier_lock_test<< std::endl;
                            //if (d_last_seg==5) d_carrier_lock_fail_counter=500; //DEBUG: force unlock!
                        }
                }
            else
                {
                    if (floor(d_sample_counter/d_fs_in) != d_last_seg)
                        {
                            d_last_seg = floor(d_sample_counter/d_fs_in);
                            std::cout << "Tracking CH " << d_channel << " CN0=" << d_CN0_SNV_dB_Hz << " [dB-Hz]" << std::endl;
                            //std::cout<<"TRK CH "<<d_channel<<" Carrier_lock_test="<<d_carrier_lock_test<< std::endl;
                        }
                }

            //predict the next loop PRN period length prediction
            float T_chip_seconds;
            float T_prn_seconds;
            float T_prn_samples;
            float K_blk_samples;
            T_chip_seconds = 1/d_code_freq_hz;
            T_prn_seconds = T_chip_seconds * GPS_L1_CA_CODE_LENGTH_CHIPS;
            T_prn_samples = T_prn_seconds * (float)d_fs_in;
            d_rem_code_phase_samples = d_next_rem_code_phase_samples;
            K_blk_samples = T_prn_samples + d_rem_code_phase_samples;

            // Update the current PRN delay (code phase in samples)
            float T_prn_true_seconds = GPS_L1_CA_CODE_LENGTH_CHIPS / GPS_L1_CA_CODE_RATE_HZ;
            float T_prn_true_samples = T_prn_true_seconds * (float)d_fs_in;
            d_code_phase_samples = d_code_phase_samples + T_prn_samples - T_prn_true_samples;
            if (d_code_phase_samples < 0)
                {
                    d_code_phase_samples = T_prn_true_samples + d_code_phase_samples;
                }
            d_code_phase_samples = fmod(d_code_phase_samples, T_prn_true_samples);
            d_next_prn_length_samples = round(K_blk_samples); //round to a discrete sample
            d_next_rem_code_phase_samples = K_blk_samples - d_next_prn_length_samples; //rounding error
        }
    else
        {
            double **out = (double **) &output_items[0]; //block output streams pointer
            *out[0] = 0;
            *out[1] = 0;
            *out[2] = 0;
            *out[3] = 0;
            *out[4] = 0;
        }


    if(d_dump)
        {
            // MULTIPLEXED FILE RECORDING - Record results to file
            float prompt_I;
            float prompt_Q;
            float tmp_E, tmp_P, tmp_L;
            float tmp_float;
            prompt_I = d_Prompt.imag();
            prompt_Q = d_Prompt.real();
            tmp_E=std::abs<float>(d_Early);
            tmp_P=std::abs<float>(d_Prompt);
            tmp_L=std::abs<float>(d_Late);
            try
            {
                    // EPR
                    d_dump_file.write((char*)&tmp_E, sizeof(float));
                    d_dump_file.write((char*)&tmp_P, sizeof(float));
                    d_dump_file.write((char*)&tmp_L, sizeof(float));
                    // PROMPT I and Q (to analyze navigation symbols)
                    d_dump_file.write((char*)&prompt_I, sizeof(float));
                    d_dump_file.write((char*)&prompt_Q, sizeof(float));
                    // PRN start sample stamp
                    //tmp_float=(float)d_sample_counter;
                    d_dump_file.write((char*)&d_sample_counter, sizeof(unsigned long int));
                    // accumulated carrier phase
                    d_dump_file.write((char*)&d_acc_carrier_phase_rad, sizeof(float));

                    // carrier and code frequency
                    d_dump_file.write((char*)&d_carrier_doppler_hz, sizeof(float));
                    d_dump_file.write((char*)&d_code_freq_hz, sizeof(float));

                    //PLL commands
                    d_dump_file.write((char*)&PLL_discriminator_hz, sizeof(float));
                    d_dump_file.write((char*)&carr_nco_hz, sizeof(float));

                    //DLL commands
                    d_dump_file.write((char*)&code_error_chips, sizeof(float));
                    d_dump_file.write((char*)&d_code_phase_samples, sizeof(float));

                    // CN0 and carrier lock test
                    d_dump_file.write((char*)&d_CN0_SNV_dB_Hz, sizeof(float));
                    d_dump_file.write((char*)&d_carrier_lock_test, sizeof(float));

                    // AUX vars (for debug purposes)
                    tmp_float = 0;
                    d_dump_file.write((char*)&tmp_float, sizeof(float));
                    d_dump_file.write((char*)&d_sample_counter_seconds, sizeof(double));
            }
            catch (std::ifstream::failure e)
            {
                    std::cout << "Exception writing trk dump file "<< e.what() << std::endl;
            }
        }
    consume_each(d_current_prn_length_samples); // this is necesary in gr_block derivates
    d_sample_counter_seconds = d_sample_counter_seconds + (((double)d_current_prn_length_samples) / (double)d_fs_in);
    d_sample_counter += d_current_prn_length_samples; //count for the processed samples
    return 1; //output tracking result ALWAYS even in the case of d_enable_tracking==false
}





void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::set_acq_code_phase(float code_phase)
{
    d_acq_code_phase_samples = code_phase;
    DLOG(INFO) << "Tracking code phase set to " << d_acq_code_phase_samples;
}




void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::set_acq_doppler(float doppler)
{
    d_acq_carrier_doppler_hz = doppler;
    DLOG(INFO) << "Tracking carrier doppler set to " << d_acq_carrier_doppler_hz;
}




void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::set_satellite(unsigned int satellite)
{
    d_satellite = satellite;
    DLOG(INFO) << "Tracking Satellite set to " << d_satellite;
}



void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::set_channel(unsigned int channel)
{
    d_channel = channel;
    DLOG(INFO) << "Tracking Channel set to " << d_channel;
    // ############# ENABLE DATA FILE LOG #################
    if (d_dump == true)
        {
            if (d_dump_file.is_open() == false)
                {
                    try
                    {
                            d_dump_filename.append(boost::lexical_cast<std::string>(d_channel));
                            d_dump_filename.append(".dat");
                            d_dump_file.exceptions ( std::ifstream::failbit | std::ifstream::badbit );
                            d_dump_file.open(d_dump_filename.c_str(), std::ios::out | std::ios::binary);
                            std::cout << "Tracking dump enabled on channel " << d_channel << " Log file: " << d_dump_filename.c_str() << std::endl;
                    }
                    catch (std::ifstream::failure e)
                    {
                            std::cout << "channel " << d_channel << " Exception opening trk dump file " << e.what() << std::endl;
                    }
                }
        }
}




void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::set_acq_sample_stamp(unsigned long int sample_stamp)
{
    d_acq_sample_stamp = sample_stamp;
}



void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::set_channel_queue(concurrent_queue<int> *channel_internal_queue)
{
    d_channel_internal_queue = channel_internal_queue;
}