Patent ID: 6985542
Filing Date: 2006-01-10
Classification: G01S,H04M

Abstract:
1. A method for determining a pseudorange, and a rate of change thereof, to a beacon that transmits a signal including a plurality of blocks, each block including a plurality of frames of a pseudonoise sequence, each block being multiplied by a bit of a data sequence, the signal being shifted relative to a nominal frequency by a frequency shift, the method comprising the steps of: (a) receiving the signal; (b) digitizing said received signal, thereby producing a digitized signal including a plurality of bits; (c) arranging said digitized signal as columns of an input matrix that includes a plurality of rows, each said column including consecutive said bits of said digitized signal that correspond to an integral number of frames of the pseudonoise sequence; and (d) performing a discrete orthogonal transform on each said row of said input matrix, thereby producing a transformed matrix.