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Minimum safe altitude monitoring, indication and warning system

  • US 4,224,669 A
  • Filed: 12/22/1977
  • Issued: 09/23/1980
  • Est. Priority Date: 12/22/1977
  • Status: Expired due to Term
First Claim
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1. A minimum safe altitude monitoring system for vehicles navigating over known terrain, and system comprising in combination with navigation computer means operable ongoingly to determine the present position of the vehicle and to provide position coordinate signals related to present position,data storage means having recorded therein minimum safe altitude value data for each of respective predetermined sectional areas of a geographic territory over which the vehicle may navigate,data retrieval means utilizing said coordinate signals ongoingly to selectively retrieve from said data storage means minimum safe altitude values to produce an output therefrom related to present position minimum safe altituderesponsive means connected to receive said output supplied by said data retrieval means,and means controlling initiation of operation of said responsive means in response to a predetermined difference between present altitude of the vehicle and said output minimum safe altitude value.

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