Mainbeam jammer nulling with monopulse angle correction

Details Mainbeam jammer nulling with monopulse angle correction Mainbeam jammer nulling with monopulse angle correction

1992-03-03

1992-12-22

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

Radar ew

Eccm

342149, G01S 736

Patent

active

051737000

ABSTRACT:
A monopulse radar system includes sum and difference receivers, and an auxiliary receive beam offset from the sum and difference beam axis. The received sum and difference signals are processed to produce first and second weighting signals which, when multiplied by the auxiliary signal, produce first and second weighted auxiliary signals which are approximately equal to the magnitude of, and are in a particular phase with, the received sum and difference signals, respectively. In the presence of a jamming signal in the main lobe of the monopulse receiver, the weighted auxiliary signals are summed with the sum and difference signals to produce adapted sum and difference signals, in which the jammer signal is suppressed by a null in the effective receive antenna pattern. The null perturbs the sum and difference patterns, so that the ratios of the sum and difference signals no longer accurately represent the off-axis angle of the target. The ratio of the adapted sum and difference signal is generated, and applied to a monopulse angle determining arrangement, in which one of a plurality of different error angle functions or curves is selected in response to the weighting signals, and the adapted sum/difference ratio is applied to the selected curve to determine the monopulse angle.

REFERENCES:
"Adaptive Main-Beam Nulling for Narrow-Beam Antenna Arrays", Adams et al., IEEE Transactions on Aerospace and Electronic Systems, Jul. 1980, pp. 509-516, vol. AFS-16, No. 4.
"A High Resolution Target-Tracking Concept Using Spectral Estimation Techniques", Gabriel, May 31, 1984.

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