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Method and apparatus for tracking targets from direct and multipath reflected radar signals

  • US 5,270,718 A
  • Filed: 08/21/1992
  • Issued: 12/14/1993
  • Est. Priority Date: 08/21/1992
  • Status: Expired due to Fees
First Claim
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1. A method for tracking at least one target with the aid of a computer and using an array having a first array portion which emits a signal A in response to radar waves striking the first array portion, and a second array portion which emits a signal B in response to radar waves striking the second array portion, and wherein a first set of radar waves strike the array at an angle θ

  • 1 relative to boresight and a second set of radar waves strike the array at an angle θ

    2 relative to boresight wherein one wishes to know at least one of angles θ

    1 and θ

    2 comprising the steps of;

    a. providing a computer with a database for the method which includes;

    (i) a distance d between the first array portion and the second array portion;

    (ii) a wavelength λ

    of the radar waves;

    (iii) a set of equations including;

    ##EQU19## where aejφ

    is a ratio of a return from the direct path to the return from the multipath;

    ##EQU20## wherein φ

    is a phase of the radar waves striking the array;

    ##EQU21## where B1 and B2 are magnitudes of successive signals emitted from the second array portion and correspond to successive looks which correspond to positions (x1,y1) and (x2,y2) on a monopulse contour defined by (x-Cx)2 +(y-Cy)2 =R2 ##EQU22## b. measuring first values of signals A and B, A1 and B1 ;

    c. generating in the computer values for x1,y1 from the measured first values and the database;

    d. measuring second values of signals A and B, A2 and B2 ;

    e. generating in the computer values for x2,y2 from the measured second values and the database;

    f. generating in the computer a value for θ

    1 for x1, y1, x2, y2 ##EQU23## and the database; and

    g. adjusting one of a radar tracking unit and a weapon to an angle of θ

    1 from the boresight.

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