Resolving Doppler Ambiguity via Spread Phase Alignment in FDA-MIMO Radar
Yanxing Wang (National Laboratory of Radar Signal Processing, Xidian University,); Shengqi Zhu (National Laboratory of Radar Signal Processing, Xidian University,); Guisheng Liao (National Laboratory of Radar Signal Processing, Xidian University,); Lan Lan (National Laboratory of Radar Signal Processing, Xidian University,); Zhuochen Chen (National Laboratory of Radar Signal Processing, Xidian University,); Feilong Liu (National Laboratory of Radar Signal Processing, Xidian University,)
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06 Jun 2023
This paper deals with the problem of Doppler ambiguity in a frequency diverse array (FDA) multiple-input and multiple-output (MIMO) radar. In our modeling stage, a spread phase alignment (SPA) method is proposed by utilizing the pluse-dependent transmit spatial frequency. In this respect, the Doppler spread alignment is performed in each transmit pulse based on spatial cancellation. Hence, the point targets, which are de-focused due to the spread Doppler frequency can be focused in the transmit spatial frequency domain. Furthermore, the Doppler ambiguity index is estimated after principle velocity compensation resorting to the maximum likelihood (ML) criterion. Numerical results are provided to verify the effectiveness of the proposed method in resolving the Doppler ambiguity.
