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"Benchmark" Performance Analysis and Covariance Matrix-Free Calibration of Uniform Linear Arrays

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arXiv:2405.03819v1 Announce Type: new
Abstract: The problems of uniform linear array (with uniform mutual coupling) calibration and Toeplitz covariance matrix estimation are re-examined for application in the receive arrays of modern High Frequency Over-the-Horizon Radars (HF OTHR). Specifics of these arrays, operating predominantly in the "over-sampled" (d/$\lambda$ < 0.5) regime, are exploited along with the recent findings in the Toeplitz Inverse Eigenvalue problem (ToIEP), Random Matrix Theory, and the "Expected Likelihood" methodology developed earlier to advance the problem solution. In this paper we re-evaluate the benchmark efficiency of the "blind" calibration and analyze several techniques that are based on certain properties of the Toeplitz covariance matrix and "over-sampled" uniform antenna arrays, but do not require matrix estimation. In Part II we analyze the case of the unknown symmetric and Hermitian Toeplitz matrices and introduce techniques for joint antenna calibration and Toeplitz covariance matrix estimation.

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