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<p>This paper proposes a novel shifted coprime array (PSCA) structure that improves the continuous degrees of freedom (cDOF) while effectively suppressing mutual coupling, all without increasing the number of physical sensors. By optimally displacing one coprime subarray, the PSCA extends the continuous virtual aperture in the difference co-array. Closed-form expressions for the optimal shift are derived separately for the cases where the parameter <i>N</i> is odd and even, and the resulting cDOF and hole distribution are analyzed. Simulation results demonstrate that, compared with traditional sparse array configurations, the proposed PSCA offers superior performance in terms of DOF utilization, mutual coupling mitigation, and DOA estimation accuracy. These advantages make the PSCA particularly suitable for high-resolution DOA estimation in practical systems such as radar, sonar, and MIMO communications.</p>

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Design of Shifted Coprime Array Configuration for DOA Estimation

  • 期刊论文

  • 发表日期：

    2025年12月21日

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  • Wei Chu,
  • Huiru Sun,
  • Yunqing Liu,
  • Xiaolong Li,
  • Zhonghang Ji,
  • He Huang

摘要

This paper proposes a novel shifted coprime array (PSCA) structure that improves the continuous degrees of freedom (cDOF) while effectively suppressing mutual coupling, all without increasing the number of physical sensors. By optimally displacing one coprime subarray, the PSCA extends the continuous virtual aperture in the difference co-array. Closed-form expressions for the optimal shift are derived separately for the cases where the parameter N is odd and even, and the resulting cDOF and hole distribution are analyzed. Simulation results demonstrate that, compared with traditional sparse array configurations, the proposed PSCA offers superior performance in terms of DOF utilization, mutual coupling mitigation, and DOA estimation accuracy. These advantages make the PSCA particularly suitable for high-resolution DOA estimation in practical systems such as radar, sonar, and MIMO communications.