126 lines
5.1 KiB
Matlab
126 lines
5.1 KiB
Matlab
function settings = initSettings()
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%Functions initializes and saves settings. Settings can be edited inside of
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%the function, updated from the command line or updated using a dedicated
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%GUI - "setSettings".
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%
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%All settings are described inside function code.
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%
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%settings = initSettings()
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%
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% Inputs: none
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%
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% Outputs:
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% settings - Receiver settings (a structure).
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%--------------------------------------------------------------------------
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% SoftGNSS v3.0
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%
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% Copyright (C) Darius Plausinaitis
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% Written by Darius Plausinaitis
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%--------------------------------------------------------------------------
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%This program is free software; you can redistribute it and/or
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%modify it under the terms of the GNU General Public License
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%as published by the Free Software Foundation; either version 2
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%of the License, or (at your option) any later version.
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%
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%This program is distributed in the hope that it will be useful,
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%but WITHOUT ANY WARRANTY; without even the implied warranty of
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%MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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%GNU General Public License for more details.
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%
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%You should have received a copy of the GNU General Public License
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%along with this program; if not, write to the Free Software
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%Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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%USA.
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%--------------------------------------------------------------------------
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% CVS record:
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% $Id: initSettings.m,v 1.9.2.32 2007/01/29 10:22:23 dpl Exp $
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%% Processing settings ====================================================
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% Number of milliseconds to be processed used 36000 + any transients (see
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% below - in Nav parameters) to ensure nav subframes are provided
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settings.msToProcess =50000; %[ms]
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% Number of channels to be used for signal processing
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settings.numberOfChannels = 6;
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% Move the starting point of processing. Can be used to start the signal
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% processing at any point in the data record (e.g. for long records). fseek
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% function is used to move the file read point, therefore advance is byte
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% based only.
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settings.skipNumberOfBytes = 0;
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%% Raw signal file name and other parameter ===============================
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% This is a "default" name of the data file (signal record) to be used in
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% the post-processing mode
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settings.fileName = ...
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'E:\data\data_ant_1.bin';
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% 'D:\Study\SDR\GPS_SDR\akos\GNSS_signal_records\GPS_and_GIOVE_A-NN-fs16_3676-if4_1304.bin';
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% '..\GNSS_signal_records\GPSdata-DiscreteComponents-fs38_192-if9_55.
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% bin';
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% Data type used to store one sample
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settings.dataType = 'short';
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settings.dataTypeSize = 2;
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% Intermediate, sampling and code frequencies
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settings.IF = ...
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2e6;
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%4.1304e6;%9.548e6; %[Hz]
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settings.samplingFreq = ...
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5e6;%5.71385e6;%16.3676e6;
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%16.3676e6;%38.192e6; %[Hz]
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settings.codeFreqBasis = 1.023e6; %[Hz]
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% Define number of chips in a code period
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settings.codeLength = 1023;
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%% Acquisition settings ===================================================
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% Skips acquisition in the script postProcessing.m if set to 1
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settings.skipAcquisition = 1000;
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% List of satellites to look for. Some satellites can be excluded to speed
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% up acquisition
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settings.acqSatelliteList = [1:32]; %[PRN numbers]
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% Band around IF to search for satellite signal. Depends on max Doppler
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settings.acqSearchBand = 14; %[kHz]
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% Threshold for the signal presence decision rule
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settings.acqThreshold = 2.0;
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%% Tracking loops settings ================================================
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% Code tracking loop parameters
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settings.dllDampingRatio = 0.7;
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settings.dllNoiseBandwidth = 2; %[Hz]
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settings.dllCorrelatorSpacing = 0.5; %[chips]
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% Carrier tracking loop parameters
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settings.pllDampingRatio = 0.7;
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settings.pllNoiseBandwidth = 25; %[Hz]
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%% Navigation solution settings ===========================================
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% Period for calculating pseudoranges and position
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settings.navSolPeriod = 500; %[ms]
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% Elevation mask to exclude signals from satellites at low elevation
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settings.elevationMask = 0; %[degrees 0 - 90]
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% Enable/dissable use of tropospheric correction
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settings.useTropCorr = 1; % 0 - Off
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% 1 - On
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% True position of the antenna in UTM system (if known). Otherwise enter
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% all NaN's and mean position will be used as a reference .
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settings.truePosition.E = nan;
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settings.truePosition.N = nan;
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settings.truePosition.U = nan;
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%% Plot settings ==========================================================
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% Enable/disable plotting of the tracking results for each channel
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settings.plotTracking = 1; % 0 - Off
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% 1 - On
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%% Constants ==============================================================
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settings.c = 299792458; % The speed of light, [m/s]
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settings.startOffset = 68.802; %[ms] Initial sign. travel time
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