A Simple Adaptive Nulling Technique Using Phase-Only Control
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
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This report describes a simple adaptive method to form nulls in the radiation pattern of large phased array antennas using phase-only control. The beam-steering phase shifters are perturbed in a manner that forms cancellation beams in the desired null directions. Each cancellation beam is shown to have a complex amplitude coefficient that can be determined from a series of five measurements of the total array output power one reference measurement with no phase perturbation and four measurements with a cancellation beam formed in the desired null direction. These beams have the same amplitude and the phase is varied in 90 deg increments. The results presented are from a numerical simulation of an 80-element array.
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation