Accession Number : ADA320250

Title :   Single Source Error Ellipse Combination.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Orechovesky, Joseph R.

PDF Url : ADA320250

Report Date : SEP 1996

Pagination or Media Count : 82

Abstract : There are a number of military applications in which the geographic location of a signal of interest is of prime importance to the ability of a unit to fulfill its mission. The accuracy of the geographic fix provided to the warfighter can directly affect the success or failure of a mission. One method to improve the accuracy of existing systems is to use the weighted average of a number of intercepts. Each intercept is manifested as an error ellipse comprised of a latitude, longitude, semi-axes, heading and a related Chi squared distributed probability. Individual error ellipses can be viewed as a quadratic surface perpendicular to the x,y plane of a bivariate normal distribution, the z-axis intersection of which corresponds to a Chi squared value. By transforming the individual error ellipses to their related location covariance matrices, Gaussian statistics may be used to produce a single location ellipse that combines information from several two dimensional target location ellipses. By providing a means to fuse data from a given source the warfighter or analyst will be able to more accurately assess a threat and respond.

Descriptors :   *SIGNALS, *ERRORS, *MILITARY APPLICATIONS, *CHI SQUARE TEST, *ELLIPSES, *LOCATORS, POSITION(LOCATION), MATRICES(MATHEMATICS), INTERCEPTION, ACCURACY, THESES, SURFACES, POSITION FINDING, QUADRATIC EQUATIONS, COVARIANCE, BIVARIATE ANALYSIS, GEOGRAPHY, NORMAL DISTRIBUTION, LATITUDE, LONGITUDE.

Subject Categories : Statistics and Probability
      Miscellaneous Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE