(19)
(11) EP 0 415 587 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.12.1992 Bulletin 1992/52

(43) Date of publication A2:
06.03.1991 Bulletin 1991/10

(21) Application number: 90308833.4

(22) Date of filing: 10.08.1990
(51) International Patent Classification (IPC)5: G08G 5/04
(84) Designated Contracting States:
CH DE GB LI SE

(30) Priority: 29.08.1989 US 400258

(71) Applicant: Hughes Aircraft Company
Los Angeles, California 90045-0066 (US)

(72) Inventors:
  • Williams, Patrick R.
    Newport Beach, California 92659 (US)
  • Rentmeesters, Mark J.
    Irvine, California 92715 (US)

(74) Representative: Colgan, Stephen James et al
CARPMAELS & RANSFORD 43 Bloomsbury Square
London WC1A 2RA
London WC1A 2RA (GB)


(56) References cited: : 
   
       


    (54) Early warning tracking system


    (57) An early warning tracking system wherein a predefined polygonal zone's position is compared with an uncertainty region projected out in front of each approaching object. Conflicts of the uncertainty regions with the predefined polygonal zone are first considered in two dimensions and finally, in a third dimension only if a lateral intrusion is preliminarily indicated. The uncertainty regions as defined are a function of the position and velocity determination as well as the variances and covariance associated with the positional and velocity determinations.






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