Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1985-10-31
1991-06-04
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342200, G01S 13536
Patent
active
050217917
ABSTRACT:
A radar system comprises a radar carrier frequency oscillator for producing a radar carrier signal, a receiver including a mixer for producing Doppler signals, a Doppler filter bank and an alarm circuit, including a series of Doppler bins, having an alarm threshold level. The radar system is provided with a frequency modulator for modulating the radar carrier signal and any interference signal received by the receiver whereby the bandwidth of the frequency modulated interference signal exceeds the bandwidth of a number of Doppler filters in the Doppler filter bank. The alarm circuit may have two threshold levels and may be controlled in dependence upon a predetermined pattern of crossings of the threshold levels.
REFERENCES:
patent: 4047172 (1977-09-01), Bauer et al.
patent: 4137532 (1979-01-01), Taylor, Jr. et al.
patent: 4488154 (1984-12-01), Ward
GEC--Marconi Limited
Tubbesing T. H.
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