Random-modulation radar signal-induced interference cancellation method and apparatus
US6809681B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 25, 1992 |
| Grant date | Oct 26, 2004 |
| Priority date | — |
| Expiry date | Aug 25, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/582
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An uncorrelated clutter noise cancellation method and apparatus employing a measured ambiguity function sample for each randomly-modulated transmission pulse in a randomly-modulated pulsed Doppler radar system. The ambiguity function samples are calculated from a stored copy of the randomly-modulated transmission signal. Estimates of the uncorrelated clutter backscatter are first developed by calculating the amplitude and phase of the radar returns detected in target range and velocity cells corresponding to stationary scatterers. The stationary scatterer contribution to each target cell, computed according to the sample ambiguity function, is then subtracted to eliminate the uncorrelated noise component in the return signal for the target cell. This clutter cancellation technique does not rely on correlations between the randomly-modulated transmission signal and the clutter return signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.