Patent ID: 8229031
Filing Date: 2012-07-24
Classification: G01S,H04B

Abstract:
1. A receiver, comprising: a first and a second baseband signal despreader stage, each said baseband signal despreader stage configured to produce, respectively, first and second coherently integrated baseband signals from a digitized baseband spread-spectrum signal corresponding to a first and a second timing estimate; a first and a second coherent integration stage coupled respectively to said first and second baseband signal despreader stages, said first and second coherent integration stages each configured to delay and form a complex conjugate respectively of said coherently integrated baseband signals, and each configured to form respectively a sum of products of said coherently integrated baseband signals with said delayed and complex conjugated coherently integrated baseband signals; and a distance estimation stage coupled to said first and second coherent integration stages, said distance estimation stage configured to produce an estimate of distance of said receiver to a transmitter from said sums of products.