Patent ID: 6055265
Filing Date: 2000-04-25
Classification: G01S,H04B

Abstract:
A GPS signal receiving apparatus using a non-coherent DLL, comprising:a satellite code generating means for receiving clock signals of a certain frequency to generate lagging, leading or normal satellite code;a correlating means for taking a correlation between a lagging, leading or normal phase satellite code of said satellite code generating means and intermediate frequency signals which have been down-converted after received from a GPS satellite;a mixing means for mixing together signals of different phases of said correlating means and signals of a local oscillator respectively;a band filter means for filtering output signals of said mixing means into preset bands respectively;an envelope detecting means for detecting envelopes from output signals of said band filter means;a subtracting means for correlating the lagging and leading phase satellite codes with the intermediate frequency signals to output a difference between the two sets of signals of said mixing means and said band filter means and said envelope detecting means;a loop filter means for filtering output signals of said subtracting means; anda voltage control oscillator for receiving output signals of said loop filter means to output oscillated signals as clock signals for said satellite code generating means.