Point clutter threshold determination for radar systems
US4713664A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 1985 |
| Grant date | Dec 15, 1987 |
| Priority date | — |
| Expiry date | May 24, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/5248
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An adaptive detection threshold system for moving target detector and moving target indicator radar systems. The threshold system uses data from the echo input signal to reconstruct a threshold level closely resembling the output clutter residue in doppler filters due to point clutter sources. At least three azimuth data values are used, with the values being from adjacent coherent processing intervals and separated in azimuth a distance approximately equal to the beamwidth of the antenna system. The data at the same range from the three azimuths is combined to form an estimate of the residue at the output of a doppler filter, assuming that the echo is caused by point clutter. Compensation for radar instability and changes in scan rate or interpulse period is included. Data from conventional constant false alarm rate processing designed to control alarms from distributed interference, such as weather echoes, is also used to compensate the residue estimate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.