Clutter rejection in a passive radar receiver of OFDM signals with antenna array
US6999025B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 2002 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Aug 6, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention concerns a passive radar receiver with an array of antennas for a OFDM received signal comprising frames of symbols each emitted on coded orthogonal carriers. After formatting received signals into digital symbols, dummy signals from dummy OFDM emitters at different distances from and in different directions relative to the receiver are generated and added to the signals picked up by the antennas. The modified received signals are filtered by means of inverse covariance matrices in order to eliminate at least unwanted zero Doppler effect signals and to provide an isotropic reception diagram without blind sector of direct path being generated and by detecting mobile targets along the direct path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.