Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1989-02-17
1991-03-12
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342145, G01S 1332
Patent
active
049996363
ABSTRACT:
Briefly, the range limiting system of the invention is capable of differentiating desired received signals having an amplitude above a predetermined threshold level and at least one other recognizable predetermined characteristic, from other received signals below that predetermined threshold amplitude. The system has a means for combining the received signal, which is of unknown amplitude which may be above or below the predetermined threshold amplitude, with a known signal of the predetermined threshold amplitude having at least one other predetermined characteristic which is distinguishable from the other recognizable characteristic of the received signal. The output of the combining means passes to a signal processing means which produces an output signal whose other recognizable characteristic is determined by the received signal only when the received signal is above the predetermined threshold amplitude, and by the known signal when the received signal is below the predetermined threshold amplitude. The presence or absence of the desired signal is determined on the basis of analysis of the other predetermined characteristic of the output signal of the signal processing means.
REFERENCES:
patent: 3412334 (1968-11-01), Whitaker
patent: 3518415 (1970-06-01), Gutleber
patent: 4209785 (1980-06-01), White
patent: 4328495 (1982-05-01), Thue
patent: 4472717 (1984-09-01), Eaves et al.
patent: 4604622 (1986-08-01), Delon et al.
Eckhardt David A.
Koelle Alfred R.
Landt Jeremy A.
Amtech Technology Corporation
Hellner Mark
Tarcza Thomas H.
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