Code phase signal multipath compensation

Details Code phase signal multipath compensation Code phase signal multipath compensation

1996-02-16

1998-12-29

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375355, 375367, H04L 2706, H04L 700

Patent

active

058548157

ABSTRACT:
Methods for synchronizing to a reference signal the timing of a received composite, code phase SATPS signal, which consists of a preferred, interference-free signal distorted by at least one interfering signal, to determine an undistorted timing point of the preferred signal. An idealized correlation function A.sub.I (t), formed from the product of a digital reference signal with a time-shifted reference signal, and a measured correlation signal A.sub.M (t), formed from the product of a received signal and a time-shifted reference signal, are computed. Peak amplitudes A.sub.M (.sub.pM) and A.sub.I (.sub.pI) are found for the respective measurable and idealized punctual code phase shifts .sub.pM and .sub.pI. The correlation measurements formed on the early side (or on the late side) of the peak for the correlation function A(t) are combined to form an estimate of the time delay associated with a multipath signal. Alternatively, correlation measurements formed on both the early and late sides of the peak are combined to form an estimate of the multipath time delay. Alternatively, a gradient difference is formed from two sets of correlation measurements to estimate the multipath time delay. Alternatively, correlation functions formed from in-phase and quadrature signals are used to estimate the multipath time delay. This last alternative allows code phase multipath time delay to be measured in the absence of receiver carrier phase lock. All four embodiments may be used in a fixed amplitude variable time (FAVT) mode and in a fixed time variable amplitude (FTVA) mode.

REFERENCES:
patent: 4203071 (1980-05-01), Bowles et al.
patent: 4545061 (1985-10-01), Hileman
patent: 5493588 (1996-02-01), Lennen

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