Accession Number : ADD012228

Title :   Palindromic Polyphase Code Expander-Compressor.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Lewis,Bernard L ; Kretschmer,Frank F , Jr

Report Date : 21 Jan 1986

Pagination or Media Count : 10

Abstract : This invention relates to digital pulse expander-compressor for generating polyphase coded pulses which are highly doppler tolerant and have autocorrelation functions which are identical under frequency sweep reversal. The expander-compressor comprises an input expansion circuit for generating N replicas of a pulse to be expanded, a matched filter FFT with phase weights disposed in each input thereto, and phase inverters disposed in every other output therefrom, and a time dispersion circuit for appropriately adding the pulses from the FFT output to yield an expanded or compressed pulse. The phase weights to be inserted at the inputs to the FFT are determined.

Descriptors :   *PATENTS, *PULSE CODE MODULATION, *PULSE GENERATORS, DIGITAL SYSTEMS, MATCHED FILTERS, FAST FOURIER TRANSFORMS, WEIGHTING FUNCTIONS, EXPANSION, PULSE COMPRESSION, SWEEP FREQUENCY TECHNIQUES, INVERTERS, AUTOCORRELATION

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE