Non-stationary dither code generation and detection

Details Non-stationary dither code generation and detection Non-stationary dither code generation and detection

2005-11-15

2005-11-15

Liu, Shuwang (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S147000, C375S149000, C370S342000, C370S324000, C370S442000

Reexamination Certificate

active

06965634

ABSTRACT:
A detector receives a signal and detects from it a long code composed from shorter codes, where the shorter codes are dithered according to a non-repeating dither pattern. The received signal is correlated with a reference code, the correlation sums are ranked, and short codes detected from the ranked sums. Because of a high jamming to signal (J/S) ratio, all the transmitted short codes may not be detected. A dither matching algorithm determines an interval between the detected codes and matches it with a previously stored dither pattern. If there is a strong match, the correlation sums and respective receive times are stored in a hypothesis data structure. If enough subsequent correlation pair have similar matches to exceed a threshold, the match is declared correct and the results are output. The time difference between received and matched pairs can be a measure of a pseudorange between transmitter and receiver.

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