Pseudorandom-noise receiver having automatic switching between r

Details Pseudorandom-noise receiver having automatic switching between r Pseudorandom-noise receiver having automatic switching between r

1996-10-02

1998-03-31

Vo, Don N.

Pulse or digital communications

Repeaters

Testing

375367, 375206, 370342, H04K 100, H04K 300

Patent

active

057346747

ABSTRACT:
A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit, multiple carrier and code synchronizing circuits, and multiple digital autocorrelators. The sampling circuit provides digital samples of a received composite signal to each of the several receiver channel circuits. The synchronizing circuits are preferably non-coherent, in the sense that they track any phase shifts in the received signal and adjust the frequency and phase of a locally generated carrier reference signal accordingly, even in the presence of Doppler or ionospheric distortion. The antocorrelators in each channel form a delay lock loop (DLL) which correlates the digital samples of the composite signal with locally generated PRN code values to produce a plurality of (early, late), or (punctual, early-minus-late) correlation signals. The time delay spacing between the (early, late), and (punctual, early-minus-late) correlation signals are dynamically adjusted, such that in an initial acquisition mode, the delay spacing is relatively wide, on the order of approximately one PRN code chip time; once PRN code lock is achieved, the code delay spacing is narrowed to a fraction of a PRN code chip time.

REFERENCES:
patent: 4914699 (1990-04-01), Dunn et al.
patent: 5166952 (1992-11-01), Omurg et al.
patent: 5259030 (1993-11-01), Francis

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