System for the acquisition of code signals

Details System for the acquisition of code signals System for the acquisition of code signals

1970-08-19

1987-01-20

Borchelt, Benjamin A.

Pulse or digital communications

Repeaters

Testing

375 21, 178 2215, 178 2219, 455 26, H04K 108

Patent

active

046384944

ABSTRACT:
A system for the secure and rapid acquisition of a transmitted acquisition composite code composed from acquisition component codes. The acquisition composite code may, for example, be composed in accordance with a Boolean majority voting rule. Reference component codes that correlate respectively with the acquisition component codes are combined to provide a verification composite code that correlates with the acquisition composite code only when all of the reference component codes in the verification code are each in alignment with the corresponding acquisition component codes in the acquisition composite code. The verification code may, for example, be composed in accordance with a modulo-2 addition rule. Initially, the reference component codes are individually brought into alignment with the transmitted signal during the acquisition thereof. The verification code is then cross-correlated against the acquired transmitted signal to verify the successful acquisition of the transmitted acquisition composite code.

REFERENCES:
Digital Communications with Space Applications, Prentiss Hall, 1964, pp. 87-103, by Mahlon F. Easterling.
A Comparison of Binary Delay-Lock Tracking-Loop Implementations by Walter J. Gill, "IEEE Transactions on Aerospace and Electronic Systems," vol. AES2, No. 4, Jul. 1966, pp. 415-425.

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