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classdef GpsConstants |
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% GPS constants, defined by WGS84 and IS-GPS-200, and derived from those |
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%Author: Frank van Diggelen |
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%Open Source code for processing Android GNSS Measurements |
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properties (Constant) %listed alphabetically |
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EARTHECCEN2 = 6.69437999014e-3; %WGS 84 (Earth eccentricity)^2 (m^2) |
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EARTHMEANRADIUS = 6371009;%Mean R of ellipsoid(m) IU Gedosey& Geophysics |
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EARTHSEMIMAJOR = 6378137; %WGS 84 Earth semi-major axis (m) |
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EPHVALIDSECONDS = 7200; %+- 2 hours ephemeris validity |
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DAYSEC = 86400; %number of seconds in a day |
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FREL = -4.442807633e-10; %Clock relativity parameter, (s/m^1/2) |
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GPSEPOCHJD = 2444244.5; %GPS Epoch in Julian Days |
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HORIZDEG = 5; %angle above horizon at which GPS models break down |
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LIGHTSPEED = 2.99792458e8; %WGS-84 Speed of light in a vacuum (m/s) |
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%mean time of flight btwn closest GPS sat (~66 ms) & furthest (~84 ms): |
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MEANTFLIGHTSECONDS = 75e-3; |
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mu = 3.986005e14; %WGS-84 Universal gravitational parameter (m^3/sec^2) |
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WE = 7.2921151467e-5; % WGS 84 value of earth's rotation rate (rad/s) |
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WEEKSEC = 604800; %number of seconds in a week |
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end |
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end |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% Copyright 2016 Google Inc. |
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% |
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% Licensed under the Apache License, Version 2.0 (the "License"); |
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% you may not use this file except in compliance with the License. |
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% You may obtain a copy of the License at |
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% |
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% http://www.apache.org/licenses/LICENSE-2.0 |
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% |
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% Unless required by applicable law or agreed to in writing, software |
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% distributed under the License is distributed on an "AS IS" BASIS, |
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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% See the License for the specific language governing permissions and |
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% limitations under the License. |
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