Dual threshold amplitude detector
US4796030A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Feb 20, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/2921
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An amplitude detector is disclosed passing only video input signals whose voltage amplitudes are within specified minimum and maximum limits, and is particularly useful in a secondary radar system for filtering out FRUIT, friendly replies to unintentionally interogated targets. A pair of comparators (4 and 31) compare the video input signal (2) against respective first and second threshold voltages (V.sub.th1) and V.sub.th2). The outputs (30 and 33) of the comparators (4 and 31) and AND'ed (34) with each other and with a digitized video signal (32) to actuate a one-shot pulse generator (12) for gating (36) a delayed digital video signal (40) through an output AND gate (22) to yield a video output signal (42).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.