Spatial combiner for a digital VLF/LF receiver
US5369663A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1991 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Mar 5, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A spatial combiner for connection to a receiver used in conjunction with a lurality 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 J.sub.1, J.sub.2, . . . , J.sub.M, 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 .sub.1, J .sub.2, . . . , J .sub.M. The combiners receive normalized outputs and sum the first K outputs to produce output C.sub.1, sum the next K outputs to produce output C.sub.2, and continuing summing outputs in the same manner until summing the last K outputs occurs to produce output C.sub.M/K. The outputs C.sub.1 through C.sub.M/K of the combiners can thereafter be processed in parallel through at least synchronization processing to identify which one of the combiner outputs is providing synchronization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.