ALM2POS computation for satellite position from almanac data file [pos,R]=alm2pos(almanac,PRN,time) calculates the satellite position in the Terrestial and in the Celestial reference frame for a desiderate satellite vehicle (PRN) with alm

GPS，基于星历对GPS卫星位置进行内插计算-calculate GPS satellites position base on almanac/ephemeris data

Global Positioning System (GPS) satellites broadcast microwave signals to enable GPS receivers on or near the Earth s surface to determine location and synchronized time. The GPS system itself is operated by the U.S. Department of Defense (DoD)