Aperture Sampling Limitations of Linear and Circular Arrays for Direction Finding and Nulling
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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Is there an upper limit to the number of elements or, equivalently, samples, that can be usefully employed for direction finding or nulling a set of incoming wavefronts within a fixed size aperture Mathematical theory states that this number is unlimited, but this result requires a perfect knowledge of the wavefront correlation matrix i.e., a noise- and error-free environment and infinite precision. To answer the question realistically, one must consider the element-to-element correlation matrix resulting from a set of incoming wavefronts impinging on an array of antenna elements. This matrix becomes ill-conditioned as the number of elements within the aperture increases.
- Direction Finding
- Radiofrequency Wave Propagation