Patent ID: 6160841
Filing Date: 2000-12-12
Classification: G01S,H04B

Abstract:
In a receiver for decoding received pseudorandom noise (PRN) encoded signals, apparatus for mitigating effects of multipath signals on phase measurement of the received PRN signals, which may include received multipath components, the apparatus comprising:a PRN code generator for generating a replica of the PRN code and for generating related phase multipath mitigation windows (MMWs);a controllable oscillator, for generating timing signals for the PRN code generator;a first correlator, for correlating the received PRN signals with the replica of the PRN code, to derive phase error signals used for controlling the oscillator;a second correlator, for correlating the received PRN signals with the phase MMWs, and thereby obtaining first samples of the received PRN signals prior to code transitions and second samples of the received PRN signals immediately after code transitions; andphase calculation logic, for eliminating the effect of multipath components by vector averaging instances of first and second MMW samples of the received PRN signals, to obtain the phase of the directly received PRN signals.