93 lines
2.6 KiB
Matlab
93 lines
2.6 KiB
Matlab
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%*******************************************************
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%
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% DESCRIPTION:
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% This script contains many useful constants for GPS
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% and related work. It should be kept in only
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% one place so that updates are immediately available
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% to all other scripts/functions.
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%
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% ARGUMENTS:
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% None, just call this script to place
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% the constants in your workspace.
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%
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% OUTPUT:
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% Variables in your current workspace.
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%
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% CALLED BY:
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% Many other codes.
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%
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% FUNCTIONS CALLED:
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% None.
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%
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% MODIFICATIONS:
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% XX-XX-02 : Jan Weiss - Original
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% 07-25-04 : Jan Weiss - updated header.
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% 10-19-04 : Jan Weiss - Cleanup and added
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% some conversion factors.
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% : See SVN log for further updates.
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%
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% Colorado Center for Astrodynamics Research
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% Copyright 2005 University of Colorado, Boulder
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%*******************************************************
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% GENERAL CONSTANTS
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% =========================================================================
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c = 299792458; %----> Speed of light (meters/s).
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Re = 6378137 ; %----> Earth Radius (meters)
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% =========================================================================
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% CONVERSION FACTORS
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% =========================================================================
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Hz2MHz = 1E-6;
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MHz2Hz = 1E6;
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s2ns = 1E9;
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ns2s = 1E-9;
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s2micros = 1E6;
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micros2s = 1E-6;
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s2ms = 1E3;
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ms2s = 1E-3;
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dtr = pi / 180;
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rtd = 180 / pi;
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m2cm = 100;
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cm2m = 1 / 100;
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m2mm = 1000;
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mm2m = 1 / 1000;
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ft2m = 0.3048; % Source: http://www.nodc.noaa.gov/dsdt/ucg/
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m2ft = 1 / 0.3048;
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ns2m = c * ns2s; % Converts time in nano-sec to distance,
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% assuming the speed of light.
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% =========================================================================
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% GNSS SPECIFIC CONSTANTS
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% =========================================================================
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L1 = 1575.42e6; %----> Freqs in Hz.
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L2 = 1227.60e6;
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L5 = 1176.45e6;
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L1MHz = 1575.42; %----> Freqs in MHz.
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L2MHz = 1227.60;
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L5MHz = 1176.45;
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L1GHz = 1.57542; %----> Freqs in GHz.
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L2GHz = 1.22760;
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L5GHz = 1.17645;
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LAMBDA_L1 = c / L1; %----> Wavelengths in meters.
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LAMBDA_L2 = c / L2;
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LAMBDA_L5 = c / L5;
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CA_CODE_RATE = 1.023e6; %----> C/A and P code chipping rate in chips/s.
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P_CODE_RATE = 10.23e6;
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CA_CHIP_PERIOD = 1 / CA_CODE_RATE; %----> C/A & P code chip periods in s.
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P_CHIP_PERIOD = 1 / P_CODE_RATE;
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CA_CHIP_LENGTH = c / CA_CODE_RATE; %----> C/A & P code chip lengths in meters.
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P_CHIP_LENGTH = c / P_CODE_RATE;
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CA_CODE_LENGTH = 1023; % chips
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% =========================================================================
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