Angle of arrival measurements for two unresolved sources

Details Angle of arrival measurements for two unresolved sources Angle of arrival measurements for two unresolved sources

1982-02-10

1985-07-30

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343424, 343 5NQ, G01S 1300

Patent

active

045325154

ABSTRACT:
A method of estimating the angles of arrival .theta.1 and .theta.2 of two closely spaced radar targets of which one target may be the virtual image of the other target. The targets are illuminated with a radar beam of wavelength WL, and the resulting echos from the targets are received at three directive antennas whose apertures are coplanar and whose phase centers are colinear and spaced a distance D apart. The received echos are converted to complex numbers S1, S2 and S3 representing the magnitude and phase of the respective echos received by the three directive antennas. If the plane of symmetry of the two targets is known, the value of a parameter WD is determined which minimizes L=.vertline.S1-WB(WD+WD*)S2+WB.sup.2 S3.vertline..sup.2, where WB=exp (j2.pi.D.theta.B/WL) and .theta.B is the known angle bisecting the angles of arrival of the two targets. If the plane of symmetry of the two targets is not known, the values of WD and WB are determined by solving for WD and WB which minimize L. The final step, in each case, is calculating the angles of arrival .theta.1 and .theta.2 from .theta.1=(WL2.pi.D)tan.sup.-1 [Im(WD.multidot.WB)/Re(WD.multidot.WB)], and .theta.2=(WL/2.pi.D)tan.sup.-1 [Im(WD*.multidot.WB)/Re(WD*.multidot.WB)].

REFERENCES:
patent: 3378843 (1968-04-01), Sherman
patent: 3945010 (1976-03-01), Wardrop
patent: 3972041 (1976-07-01), Howard
patent: 3987442 (1976-10-01), McLeod, Jr.
patent: 4053885 (1977-10-01), Tomita et al.
patent: 4095224 (1978-06-01), Dounce et al.
patent: 4117538 (1978-09-01), Shrader et al.
patent: 4173017 (1979-10-01), Burlnge et al.
patent: 4219816 (1980-08-01), Schenkel et al.
patent: 4231005 (1980-10-01), Taylor, Jr.

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