Code tracking apparatus with improved resolution for spread spec

Details Code tracking apparatus with improved resolution for spread spec Code tracking apparatus with improved resolution for spread spec

1989-03-01

1990-10-23

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

H04L 900

Patent

active

049658085

ABSTRACT:
A tau-dither code correlation tracker includes a code clock and phase shifter for clocking the local code. A sequence of tau-dither patterns are applied to the phase shifter wherein each pattern has an incrementally displaced average phase shift with respect to an adjacent pattern in the sequence. The incremental average phase shift displacements are smaller than the phase shift increments provided by the code clock for enhanced resolution. The correlator output is amplitude detected and applied directly and through a plurality inverter to an electronic switch. The electronic switch is controlled to switchably apply the direct and polarity inverted amplitude signal to an integrator in accordance with the tau-dither pattern. The integrator output is compared to a threshold to control the sequence of tau-dither patterns.

REFERENCES:
patent: 4457006 (1984-06-01), Maine

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