G - Physics – 01 – S
Patent
G - Physics
01
S
351/19
G01S 3/16 (2006.01) G01S 3/28 (2006.01) H01Q 3/26 (2006.01) H01Q 3/34 (2006.01)
Patent
CA 1204204
Abstract of the Disclosure Multiple interference sources are independently acquired, tracked and cancelled in a multi-element antenna array where the number of antenna elements n is an integer power of the base 2, i.e. n = 2M where M is the number of sources desired to be cancelled. The antenna elements are selectively coupled to sets of n/2 phase shifters in respec- tive closed loop control circuits and operate in phase con- trolled sets, one for each interference source. The phase of the received signal incident on one half of the elements in each set is independently adjusted relative to the other half, for each desired null in a separate control loop, such that for a particular interfering source each antenna element of the set has one corresponding neighboring element in a pair of elements whose phase mutually differs by 180° at the space angle of the arrival of the interference wavefront relative to the axis of the antenna. This produces a substantially infinite null in the direction of arrival of the particular interfering wavefront and thus complete cancellation of that interfering source is effected. This null is retained as other interfering sources are independently acquired, nulled and tracked by a respective different set of n/2 elements in the same array.
445850
Aspila Kalevi P.
Government Of The United States (the) As Represented By The Secr
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