Signal acquisition with efficient doppler search

Details Signal acquisition with efficient doppler search Signal acquisition with efficient doppler search

2006-05-03

2009-12-22

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S136000, C375S147000, C375S327000, C375S341000, C370S320000, C370S335000

Reexamination Certificate

active

07636383

ABSTRACT:
A receiver for computationally efficient signal acquisition of spread-spectrum chips affected by Doppler shift in an advanced tactical data link. Received signals with a very low signal-to-noise ratio are parsed in a multi-stage signal acquisition circuit architecture, and compared to a known sequence to determine correlation over a subset of the known sequence. Chip-rate-coherent correlation is performed over an interval of time for which the effect of Doppler shift on the chip rate are negligible. A non-coherent block then integrates intermediate metrics to obtain final metrics for the entire known sequence. The parsing of the correlation into subsets and stages allows for a more computationally efficient solution to the Doppler shift chip rate error problem by reducing the number of intermediate metrics that must be computed at high speed.

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Wavelets and Wideband Correlation Processing; Lora G. Weiss; IEEE Signal Processing Magazine; Jan. 1994; p. 13-32.

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