Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1984-02-27
1988-03-22
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342122, G01S 1334
Patent
active
047332395
ABSTRACT:
A Radar Altimeter signal presence circuit which provides improved useable system sensitivity for a given false track probability by providing an improved method for detecting the adequacy of the return signal. This return signal is composed of many small, rapidly changing reflections that vary between additive and substractive combination giving the net return the characteristic of noise. A non-linear detector is used to enhance the signal presence detectors sensitivity to weak but adequate returns while (1) reducing the ability of short periods of strong returns to cause a positive signal presence indication when the overall signal is inadequate, and (2) retaining a high sensitivity to periods of signal fades that produce measurement errors. This is accomplished by using a non-linear detector that reduces the effect of strong returns when the many small reflections tend to combine additively, and increases the effect of weak returns when the many small reflections tend to combine subtractively.
REFERENCES:
patent: 2256539 (1941-09-01), Alford
patent: 2533898 (1950-12-01), Robinson et al.
patent: 2726383 (1955-12-01), Dunn
patent: 2929057 (1960-03-01), Green
Barron Jr. Gilberto
Reid Malcolm
Tubbesing T. H.
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