Constant ratio coding for multipath rejection and ECCM enhanceme

Cryptography – Key management – Having particular key generator

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342 16, 342388, 342189, 375 58, H04L 922, G01S 736, G01S 766, G01S 124

Patent

active

052456595

ABSTRACT:
A method is disclosed for encoding signals for transmission to provide signals which simultaneously have specifiable autocorrelation properties and low predictability. To enhance the accuracy of time of arrival measurements in the presence of either noise or multipath due to skywaves in systems such as LORAN, the coding method provides for low autocorrelation function values at time offsets approximately equal to the expected delay between direct waves and skywaves. This is accomplished by constructing the codeword which is used to encode the signal, from an Nth difference constant ratio codeword, where the expected time delay is equal to N-bits. The constant ratio codewords and the transmitted codewords are both pseudo-randomly generated, resulting in a transmitted signal having very low predictability to an unintended recipient, thereby considerably reducing the effectiveness of attempts at jamming or other electronic countermeasures attacks.

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"Pseudo Random Truly Uniform Noise Generator", by N. Abbattista et al., Instituto di Fisica dell'Universita, Bari, Italy, Nuclear Instruments and Methods, 60, (1968), 317-322; .COPYRGT.North-Holland Publishing Co., Dec. 14, 1967.

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