Title: Method of and apparatus for stabilizing the display rate of permanent echoes in a radar system

Abstract: A method and an apparatus for determining in a radar system the optimum eination threshold for suppressing permanent echoes are described. A basic elimination threshold is defined which is modified once per revolution of the radar antenna or several times during each revolution in each area covered by the radar system, by the addition or the subtraction of a coefficient depending on the comparison of the amplitude of the video signals with a previously set threshold. Then the residual clutter rate is calculated for each revolution of the antenna and also for each area covered and is compared with two fixed values, i.e. an upper and lower limit. A coefficient is derived from this comparison and is added to or subtracted from this previously set normal threshold, depending on whether the result of the comparison, is less than the minimum-rate value or greater than the maximum-rate value.

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Inventors: Busy, Francis (Paris, FR)

Application Number: 480145
Filing Date: 1974-06-17
Publication_date: 1976-04-13
Assignee: Thomson-CSF Visualisation et Traitement des Informations (T-VT) (Paris, FR)
Primary Class(es): 342/93
Other Classes:
US Patent Ref:

3380018	Apr, 1968	Littrell et al.	343/74.
3430235	Feb, 1969	Bender et al.	343/7.
3505637	Apr, 1970	Abruzzo	343/7.
3582872	Jun, 1971	Prager	343/7.
3761922	Sep, 1973	Evans	343/5.
3778822	Dec, 1973	Bauer	343/5.
3778825	Dec, 1973	Ares et al.	343/7.

Other Refs:
Primary Examiner: Tubbesing, T. H.
Assistant Examiner: Montone, G. E.
Attorney: Ross; Karl F., Dubno; Herbert