Dual threshold amplitude detector

Details Dual threshold amplitude detector Dual threshold amplitude detector

1987-02-20

1989-01-03

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Air traffic control

Secondary surveilance radar

307360, G01S 1374

Patent

active

047960302

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).

REFERENCES:
patent: 3305860 (1967-02-01), Humphreys
patent: 4070673 (1978-01-01), Schmidt et al.
patent: 4135161 (1979-01-01), Torrieri
patent: 4139851 (1979-02-01), Risko
patent: 4184087 (1980-01-01), Nutz
patent: 4217506 (1980-08-01), Sawyer, Jr. et al.
patent: 4524291 (1985-06-01), Lehning
patent: 4613770 (1986-09-01), Raab
patent: 4618770 (1986-10-01), Maile

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