Patent ID: 6804290
Filing Date: 2004-10-12
Classification: G01S,H04B

Abstract:
A method of acquiring signal code phases in a geographic positioning receiver comprising the steps of:providing a memory with at least three portions, a correlator with an adder coupled thereto, and a comparator, microprocessor, mixer, and a numerically controlled oscillator coupled to each other and the memory, and providing a predetermined pattern sequence; receiving a first signal sequence; storing the fist signal sequence in a first memory portion and storing the predetermined pattern sequence in a second memory portion; comparing the first signal sequence and the predetermined pattern sequence in the correlator; generating correlation values; adding the correlation values from the correlator into correlation sums in the adder; storing the correlation sums from the adder in a third memory portion; selecting by the comparator from the third memory portion a final correlation sum with a greatest magnitude from the correlation sums; and determining a code phase for the first signal sequence from the final correlation sum.