Patent ID: 8170086
Filing Date: 2012-05-01
Classification: G01S,G06F,H04B

Abstract:
1. A method of computing a correlation between a pseudorandom reference code and a satellite signal, the method comprising: (a) receiving a satellite signal having a repeating code modulated thereon; (b) correlating less than an entire length of a pseudorandom reference code with a portion of the satellite signal to produce a partial correlation; and (c) forming values representative of a magnitude or a power of the partial correlation produced by correlating less than an entire length of the pseudorandom reference code with the portion of the satellite signal to produce an energy signal, wherein the magnitude is the square root of the sum of squared in-phase and quadrature partial correlations; (d) repeating steps (b) and (c) to produce a plurality of energy signals; and (e) summing the plurality of energy signals as each energy signal is produced.