System and method for tracking targets in a multipath environmen

Details System and method for tracking targets in a multipath environmen System and method for tracking targets in a multipath environmen

1981-03-10

1984-05-15

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 16M, G01S 1344

Patent

active

044491271

ABSTRACT:
A method and apparatus is described for determining the presence of multipath conditions when tracking a target with a radar wherein the radar includes apparatus for transmitting signals and receiving target reflected signals along two boresight reference lines angularly displaced less than one beamwidth and means for processing the target reflected signals along both boresight reference lines to provide an elevation estimate of the target by target reflected signals along both boresight reference lines and to derive the quadrature component, if any, along both boresight reference line axes. A difference in target elevation derived from target reflected signals along both boresight reference lines or the presence of a quadrature component along one or both boresight reference lines is used to determine the presence of multipath conditions and to provide signals to select one of the elevation signals for tracking or to provide an estimate of target position. The selected elevation signal may be filtered and may have a correction factor added to it.

REFERENCES:
patent: 2717380 (1955-09-01), Brooks, Jr.
patent: 3757326 (1973-09-01), White
patent: 3827049 (1974-07-01), van Staaden et al.
patent: 3906495 (1975-09-01), Roger
patent: 4163975 (1979-08-01), Guilhem et al.

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