Interface of a library with a set of code tracking and carrier tracking discriminators. More...

#include <gnuradio/gr_complex.h>
#include <cmath>

Functions
double	fll_four_quadrant_atan (gr_complex prompt_s1, gr_complex prompt_s2, double t1, double t2)

double	fll_diff_atan (gr_complex prompt_s1, gr_complex prompt_s2, double t1, double t2)

double	phase_unwrap (double phase_rad)
	Phase unwrapping function, input is [rad]. More...

double	pll_four_quadrant_atan (gr_complex prompt_s1)
	PLL four quadrant arctan discriminator. More...

double	pll_cloop_two_quadrant_atan (gr_complex prompt_s1)
	PLL Costas loop two quadrant arctan discriminator. More...

double	dll_nc_e_minus_l_normalized (gr_complex early_s1, gr_complex late_s1, float spc=0.5, float slope=1.0, float y_intercept=1.0)
	DLL Noncoherent Early minus Late envelope normalized discriminator. More...

double	dll_nc_vemlp_normalized (gr_complex very_early_s1, gr_complex early_s1, gr_complex late_s1, gr_complex very_late_s1)
	DLL Noncoherent Very Early Minus Late Power (VEMLP) normalized discriminator. More...

template<typename Fun >
double	CalculateSlope (Fun &&f, double x)

template<typename Fun >
double	CalculateSlopeAbs (Fun &&f, double x)

template<typename Fun >
double	GetYIntercept (Fun &&f, double x)

template<typename Fun >
double	GetYInterceptAbs (Fun &&f, double x)

template<int M = 1, int N = M>
double	SinBocCorrelationFunction (double offset_in_chips)

template<int M = 1, int N = M>
double	CosBocCorrelationFunction (double offset_in_chips)

Detailed Description

Interface of a library with a set of code tracking and carrier tracking discriminators.

Authors

Javier Arribas, 2011. jarribas(at)cttc.es
Luis Esteve, 2012. luis(at)epsilon-formacion.com

Library with a set of code tracking and carrier tracking discriminators that is used by the tracking algorithms.

GNSS-SDR is a software defined Global Navigation Satellite Systems receiver

This file is part of GNSS-SDR.

SPDX-License-Identifier: GPL-3.0-or-later

Definition in file tracking_discriminators.h.

Function Documentation

◆ dll_nc_e_minus_l_normalized()

double dll_nc_e_minus_l_normalized	(	gr_complex	early_s1,
		gr_complex	late_s1,
		float	spc = `0.5`,
		float	slope = `1.0`,
		float	y_intercept = `1.0`
	)

DLL Noncoherent Early minus Late envelope normalized discriminator.

DLL Noncoherent Early minus Late envelope normalized discriminator:

$\begin{equation} error = \frac{y_{intercept} - \text{slope} * \epsilon}{\text{slope}} \frac{E-L}{E+L}, \end{equation}$

where $E=\sqrt{I_{ES}^2+Q_{ES}^2}$ is the Early correlator output absolute value and $L=\sqrt{I_{LS}^2+Q_{LS}^2}$ is the Late correlator output absolute value. The output is in [chips].

◆ dll_nc_vemlp_normalized()

double dll_nc_vemlp_normalized	(	gr_complex	very_early_s1,
		gr_complex	early_s1,
		gr_complex	late_s1,
		gr_complex	very_late_s1
	)

DLL Noncoherent Very Early Minus Late Power (VEMLP) normalized discriminator.

DLL Noncoherent Very Early Minus Late Power (VEMLP) normalized discriminator, using the outputs of four correlators, Very Early (VE), Early (E), Late (L) and Very Late (VL):

$\begin{equation} error=\frac{E-L}{E+L}, \end{equation}$

where $E=\sqrt{I_{VE}^2+Q_{VE}^2+I_{E}^2+Q_{E}^2}$ and $L=\sqrt{I_{VL}^2+Q_{VL}^2+I_{L}^2+Q_{L}^2}$ . The output is in [chips].

◆ fll_four_quadrant_atan()

double fll_four_quadrant_atan	(	gr_complex	prompt_s1,
		gr_complex	prompt_s2,
		double	t1,
		double	t2
	)

brief FLL four quadrant arctan discriminator

FLL four quadrant arctan discriminator:

$\begin{equation} \frac{\phi_2-\phi_1}{t_2-t1}=\frac{ATAN2(cross,dot)}{t_1-t_2}, \end{equation}$

where $cross=I_{PS1}Q_{PS2}-I_{PS2}Q_{PS1}$ and $dot=I_{PS1}I_{PS2}+Q_{PS1}Q_{PS2}$ , $I_{PS1},Q_{PS1}$ are the inphase and quadrature prompt correlator outputs respectively at sample time $t_1$ , and $I_{PS2},Q_{PS2}$ are the inphase and quadrature prompt correlator outputs respectively at sample time $t_2$ . The output is in [radians/second].