Airport surface detection equipment (ASDE)
First Claim
1. An ASDE radar comprising an antenna having an elevation-depending gain factor ##EQU24## for ω
-
1 ≦
ω
<
ω
2 where ω
1, ω and
ω
2 represent angles of depression and a receiver having a sensitivity time control circuit.
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Accused Products
Abstract
The invention relates to an ASDE radar to supply information on airport surface traffic. A well-known ASDE radar comprises an antenna having an elevation-depending gain factor ##EQU1## for ω1 ≦ω<ω2, where ω1, ω and ω2 represent angles of depression. In such a radar, the echo power of an airport surface target is independent of the distance, whereas the echo power of rain clutter is inversely proportional to the square of the distance. Consequently, a remote surface target still projected on the radar screen above the rain clutter, is likely to disappear in the rain clutter when approaching the radar; this may result in fatal consequences. To solve the above problem, the ASDE radar of the invention comprises a combination of an antenna having a gain factor ##EQU2## and a sensitivity time control circuit in its receiver.
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Citations
4 Claims
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1. An ASDE radar comprising an antenna having an elevation-depending gain factor ##EQU24## for ω
-
1 ≦
ω
<
ω
2 where ω
1, ω and
ω
2 represent angles of depression and a receiver having a sensitivity time control circuit. - View Dependent Claims (2, 3, 4)
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1 ≦
Specification
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- Resources
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Current AssigneeHollandse Signaalapparaten BV (Thales SA)
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Original AssigneeHollandse Signaalapparaten BV (Thales SA)
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InventorsMulder, Willem, Vaessen, Dorotheus C. L., De Lange, Nicolaas H.
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Primary Examiner(s)Tubbesing, T. H.
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Application NumberUS05/968,941Time in Patent Office580 DaysField of Search343/5 SM, 343/5 LSUS Class Current342/36CPC Class CodesC08G 2340/00 Filter materialC08G 63/08 Lactones or lactidesH01Q 19/12 wherein the surfaces are co...
