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Radar apparatus

  • US 5,426,436 A
  • Filed: 01/06/1994
  • Issued: 06/20/1995
  • Est. Priority Date: 11/21/1990
  • Status: Expired due to Term
First Claim
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1. In radar apparatus of the kind comprising a radar display screen, a display control unit for providing on the screen a radar display image, and a user entry device for selecting a control function of the apparatus, the improvement wherein said display control unit is arranged to provide on the screen at least one representation of a control function of the apparatus and a movable marker, said user entry device comprising a plurality of keys and a manually-displaceable member that is displaceable to control the position of the marker on the screen, said keys being located close to said manually-displaceable member so that the keys can be operated by the same hand of the user that controls the manually-displaceable member such that positioning of the marker in the region of a representation of the control function is sufficient in itself to cause said display control unit to automatically display on the screen a plurality of representations of options for the control function equal to the number of keys on said user entry device, each of said keys being associated with a different one of the options displayed on the screen so that the user can switch the radar apparatus to the desired option for the control function solely by actuation of the appropriate one of said keys.

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