METHODS AND SYSTEMS FOR PSEUDO-RANDOM CODING IN A WIDE AREA POSITIONING SYSTEM

摘要

Devices, systems, and methods for improving performance in positioning systems are disclosed. Signal processing methods are described for selecting certain spreading codes having desired auto and/or cross-correlation properties and generating, transmitting, and receiving signals generated using the selected codes.

主权项

1. A system for selecting codes to be used within positioning signals sent from one or more transmitters, the system comprising at least one processor operable to:
identify a set of digital pseudorandom sequences, wherein a magnitude of an autocorrelation function of each member of the set of digital pseudorandom sequences, within a specified zonal region adjacent to a peak of the autocorrelation function, is equal to or less than a first prescribed value; and identify a subset of digital pseudorandom sequences, from among two or more subsets of pseudorandom sequences in the set of pseudorandom sequences, that optimizes a performance criterion, wherein the performance criterion is associated with a relationship between members within any subset of the two or more subsets.