?? jd2gps.m
字號:
function [gpsweek,sow,rollover]=jd2gps(jd);% JD2GPS Converts Julian date to GPS week number (since% 1980.01.06) and seconds of week. Non-vectorized version.% See also CAL2JD, DOY2JD, GPS2JD, JD2CAL, JD2DOW, JD2DOY,% JD2YR, YR2JD.% Version: 28 Sep 03% Usage: [gpsweek,sow,rollover]=jd2gps(jd)% Input: jd - Julian date% Output: gpsweek - GPS week number% sow - seconds of week since 0 hr, Sun.% rollover - number of GPS week rolloversif nargin ~= 1 warning('Incorrect number of arguments'); return;endif jd < 0 warning('Julian date must be greater than or equal to zero'); return;endjdgps = cal2jd(1980,1,6); % beginning of GPS week numberingnweek = fix((jd-jdgps)/7);sow = (jd - (jdgps+nweek*7)) * 3600*24;rollover = fix(nweek/1024); % rollover every 1024 weeksgpsweek = mod(nweek,1024);
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