Double superheterodyne type microwave detector capable of detect

Details Double superheterodyne type microwave detector capable of detect Double superheterodyne type microwave detector capable of detect

1999-09-17

2000-10-24

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

Specific condition

342 20, 342100, 342 99, 455227, 455207, 455208, 455209, G08B 1326

Patent

active

061374067

ABSTRACT:
A double superheterodyne type microwave detector is constructed from a reception antenna; a first local oscillator; a second local oscillator; reception means for detecting microwaves having prescribed frequencies based on signals obtained by carrying out a first mixing in which the output of the first local oscillator is mixed with the microwaves picked up by the antenna, and a second mixing in which the signals obtained from the first mixing are mixed with the output of the second local oscillator; judgement means for judging whether or not an actual microwave signal which forms a detection target has been detected by the reception means; alarm means for outputting an alarm when the judgement means judges an actual microwave signal to have been received by the reception means; and first control means for suspending the first mixing when the reception means detects a microwave signal having a prescribed frequency; wherein the judgement of whether or not the prescribed frequency microwave signal detected by the reception means is an actual microwave signal is carried out based on information obtained by the judgement means after the first mixing is suspended.

REFERENCES:
patent: 5268689 (1993-12-01), Ono et al.
patent: 5461383 (1995-10-01), Ono et al.

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