Cyclic redundancy check monitor for microwave landing system bea

Details Cyclic redundancy check monitor for microwave landing system bea Cyclic redundancy check monitor for microwave landing system bea

1983-02-28

1985-07-30

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343377, 343 177, H01Q 322, H01Q 324, H01Q 326

Patent

active

045325170

ABSTRACT:
In a microwave landing system the individual words of a train of command words generated by the antenna beam steering unit are applied to a polynomial generator where each is, seriatim, summed with a polynomial check word generated in a previous operation. The result is shifted once toward the most significant bit to increase the degree of the resultant polynomial. Division by a predetermined generator polynomial is accomplished and the remainder is stored as the check word to be used in the next to follow operation. The check word polynomials are compared at preset intervals with stored check words to monitor the train of command words.

REFERENCES:
patent: 4065771 (1977-12-01), Gulick et al.
patent: 4368533 (1983-01-01), Kojima
"Cyclic Codes for Error Detection" by Peterson & Brown Proc. IRE, Jan. 1961, pp. 228-235.

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