Patent ID: 6239743
Filing Date: 2001-05-29
Classification: G01S,H04B

Abstract:
A positioning receiver comprising:an antenna for receiving positioning signals, at least one of the positioning signals being a split spectrum positioning signal and at least one of the positioning signals being an unsplit positioning signal; the split spectrum positioning signal including energy representing positioning information split such that the energy is concentrated about at least a first frequency and a second frequency within a frequency band;a radio frequency circuit for converting the positioning signals to intermediate frequency signals;a digital signal processor for receiving the intermediate frequency signals and tracking at least one of the positioning signals; anda processor for controlling at least the digital signal processor;the digital signal processor having:a tracking unit including at least a first tracker and a second tracker for tracking the split spectrum positioning signal, each tracker receiving the intermediate frequency signals, and generating at least one correlation signal for tracking the split spectrum positioning signal; anda second tracking unit including at least one tracker for tracking the unsplit positioning signal, the tracker in the second tracking unit receiving the intermediate frequency signals and generating at least one correlation signal for tracking the unsplit positioning signal.