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Angle and Range Unambiguous Estimation with Nested Frequency Diverse Array MIMO Radars
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DOI：10.3390/rs17030446.png)
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Abstract
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This paper proposes an unambiguous method for joint angle and range estimation in colocated multiple-input multiple-output (MIMO) radar using the nested frequency diverse array (NFDA). Unlike a conventional phased array (PA), the transmission beampattern of FDA-MIMO radar depends not only on angle but also on range, which enables the precise identification of ambiguous regions in the two-dimensional frequency space. As a result, we can simultaneously estimate the angle and range of targets using FDA-MIMO radar, even when range ambiguity exists. By employing a nested array configuration, the degrees of freedom (DOFs) of the FDA are expanded. This expansion leads to improved accuracy in parameter estimation and enables a greater number of identifiable targets. In addition, the Cram & eacute;r-Rao lower bound (CRLB) and the algorithm complexity are obtained to facilitate performance analysis. The simulation outcomes are presented to showcase the superior performance of the suggested approach.
Keywords:
nested frequency diverse array
colocated multiple-input multiple-output radar
angle-range unambiguous estimation
Cram & eacute
r-Rao lower bound
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4.1
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7.8K
Citations:
15.1W
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