Patent ID: 6828935
Filing Date: 2004-12-07
Classification: G01S,H01Q

Abstract:
A global positioning system (GPS) receiver for use with plural satellites that transmit RF signals distinguished from one another by unique pseudo-random spread spectrum codes, comprising:an array of plural antennas having a spacing D between adjacent antennas of the array, and providing respective received RF signals; a set of parallel digital signal processing channels for processing said respective RF signals, each one of said parallel digital signal processing channels comprising: an analog-to-digital converter for converting the respective received RF signal to a respective digital signal; a local pseudo-random code generator for generating a pseudo-random code corresponding to a selected one of said satellites; a first correlator for computing a first correlation function between the pseudo-random code from said local pseudo-random code generator and said digital signal; means for imposing a phase delay corresponding to a phase angle &THgr; in the digital signal flow through said one digital signal processing channel, the phase angle &THgr; being different in each of said channels and the difference between phase angles of channels corresponding to adjacent ones of said plural antennas being such as to align an antenna beam direction of said array toward said selected satellite corresponding to said pseudo-random code; and a first summing node for summing the first correlation functions produced by all of said parallel digital processing channels.