Adaptive Array Processing - Near Field Experiment,
DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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Adaptive array processing in airborne radars to overcome jamming is critical to obtaining satisfactory performance in a hostile environment. The usual application of a plane wave solution to this situation is inadequate when there is nearfield scattering. The proposed algorithm introduced in this paper is effective for wavefronts originating from all ranges, even though emphasis will be placed on the spherical wavefronts produced in the near field regions. A single snapshot based high-resolution adaptive algorithm employing the Least Square Technique is considered in two stages. First, the directions of arrival of all spherical or plane wavefronts impinging on a linear sensor array is estimated. Next, nulls are formed in the estimated directions of the interferers while receiving the desired signal. This optimal solution is undeniably computationally intensive. However, to be able to resolve near field specular reflectionsjamming accurately is a breakthrough for all concerned. The effectiveness of this algorithm is demonstrated both experimentally and by simulation.
- Radar Countermeasures