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Sensors 2018, 18(2), 520; https://doi.org/10.3390/s18020520

An Improved Adaptive Received Beamforming for Nested Frequency Offset and Nested Array FDA-MIMO Radar

1
National Key Laboratory of Mechatronic Engineering and Control, Beijing Institute of Technology, Beijing 100081, China
2
Beijing Institute of Spacecraft System Engineering, Beijing 100086, China
*
Author to whom correspondence should be addressed.
Received: 25 December 2017 / Revised: 2 February 2018 / Accepted: 5 February 2018 / Published: 8 February 2018
(This article belongs to the Special Issue First Experiences with Chinese Gaofen-3 SAR Sensor)
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Abstract

For the conventional FDA-MIMO (frequency diversity array multiple-input-multiple-output) Radar with uniform frequency offset and uniform linear array, the DOFs (degrees of freedom) of the adaptive beamformer are limited by the number of elements. A better performance—for example, a better suppression for strong interferences and a more desirable trade-off between the main lobe and side lobe—can be achieved with a greater number of DOFs. In order to obtain larger DOFs, this paper researches the signal model of the FDA-MIMO Radar with nested frequency offset and nested array, then proposes an improved adaptive beamforming method that uses the augmented matrix instead of the covariance matrix to calculate the optimum weight vectors and can be used to improve the output performances of FDA-MIMO Radar with the same element number or reduce the element number while maintain the approximate output performances such as the received beampattern, the main lobe width, side lobe depths and the output SINR (signal-to-interference-noise ratio). The effectiveness of the proposed scheme is verified by simulations. View Full-Text
Keywords: FDA-MIMO; nested frequency offset; nested array; adaptive beamforming FDA-MIMO; nested frequency offset; nested array; adaptive beamforming
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Cheng, S.; Zhang, Q.; Bian, M.; Hao, X. An Improved Adaptive Received Beamforming for Nested Frequency Offset and Nested Array FDA-MIMO Radar. Sensors 2018, 18, 520.

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