classdef GpsConstants
    % GPS constants, defined by WGS84 and IS-GPS-200, and derived from those

    %Author: Frank van Diggelen
    %Open Source code for processing Android GNSS Measurements
   
    properties (Constant) %listed alphabetically
        EARTHECCEN2 = 6.69437999014e-3; %WGS 84 (Earth eccentricity)^2 (m^2)
        EARTHMEANRADIUS = 6371009;%Mean R of ellipsoid(m) IU Gedosey& Geophysics
        EARTHSEMIMAJOR = 6378137; %WGS 84 Earth semi-major axis (m)
        EPHVALIDSECONDS = 7200; %+- 2 hours ephemeris validity
        DAYSEC = 86400; %number of seconds in a day
        FREL = -4.442807633e-10; %Clock relativity parameter, (s/m^1/2)
        GPSEPOCHJD = 2444244.5; %GPS Epoch in Julian Days
        HORIZDEG = 5; %angle above horizon at which GPS models break down
        LIGHTSPEED = 2.99792458e8; %WGS-84 Speed of light in a vacuum (m/s)
        %mean time of flight btwn closest GPS sat (~66 ms) & furthest (~84 ms):
        MEANTFLIGHTSECONDS = 75e-3;
        mu = 3.986005e14; %WGS-84 Universal gravitational parameter (m^3/sec^2)
        WE = 7.2921151467e-5;  % WGS 84 value of earth's rotation rate (rad/s)
        WEEKSEC = 604800; %number of seconds in a week
    end
end
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