Accession Number : ADD017312

Title :   Spatial Combiner for a Digital VLF/LF Receiver.

Descriptive Note : Patent, Filed 5 Mar 91, patented 29 Nov 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bond, James W

Report Date : 29 Nov 1994

Pagination or Media Count : 7

Abstract : A spatial combiner for connection to a receiver used in conjunction with a plurality of direction-sensitive antennas for receiving a spread-spectrum communication signal in the presence of interference includes a steering network, a plurality of normalizers, and a plurality of combiners. The steering network combines N inputs from N antennas and produces outputs Ji, J2,...,JM, with M being a multiple of K and K a positive integer such that each M output is a weighted sum of N inputs from the antennas. The normalizers receive and normalize the M outputs to unit energy and produce normalized outputs J 1, J 2,...,JM. The combiners receive normalized outputs and sum the first K outputs to produce output C1, sum the next K outputs to produce output C2, and continuing summing outputs in the same manner until summing the last K outputs occurs to produce output CM/K. The outputs C1 through CAM/Kof the combiners can thereafter be processed in parallel through at least synchronization processing to identify which one of the combiner outputs is providing synchronization.

Descriptors :   *RADIO RECEIVERS, *LOW FREQUENCY, *VERY LOW FREQUENCY, *DIGITAL COMBINERS, OUTPUT, DIGITAL SYSTEMS, SPATIAL DISTRIBUTION, STEERING, NETWORKS, ENERGY, SIGNALS, ANTENNAS, SYNCHRONIZATION(ELECTRONICS), COMMUNICATION AND RADIO SYSTEMS, DIGITAL COMMUNICATIONS, SPREAD SPECTRUM

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE