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中文摘要：
针对因使用天线阵列而造成的天线互耦和阵元位置未核准问题,利用多模天线多个模式输出间的内在联系,以及完全非圆信号的特殊性质,提出了一种旋转不变型闭式波达方向（direction of arrival,DOA）估计方法。由于该法只需使用单个结构紧凑的双锥天线,无须像传统天线阵列一样进行复杂的阵元空间位置校准,适用于阵列摆放空间受限的应用场合。计算机仿真结果验证了算法的有效性和优越性。
英文摘要：
Taking into account the intrinsic feature of multimode antenna＇s modal outputs as well as the unique property of fully-noncircular signals,an ESPRIT-like closed-form direction of arrival（DOA） estimation method is proposed.By using only one single compact multimode antenna,this method does not involve complicated element-position calibration,and is attractive when space for array arrangement is very small.Computer simulations are performed to validate the proposed method.
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