Selectable doppler filter for radar systems
US4709236A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 1985 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | May 8, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/53
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An arrangement for selecting between different doppler filter pairs having response characteristics optimized for ground clutter or moving rain clutter rejection. The selecting process detects the amplitude and mean doppler of the received radar echoes. The filter which is optimized for rain clutter rejection is normally used until clutter amplitude is detected above a predetermined value and the mean doppler is detected as being equal to or near zero. When such a detection is made, the filter optimized for ground clutter rejection is selected. Portions of the selecting device allow for the selection to be determined over several samples rather than switching the filters in each sample or coherent processing interval. Another portion of the circuitry changes the predetermined values which must be exceeded for a selection of the ground clutter filter, thereby preventing another filter change with only a small change in detected amplitude or mean doppler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.