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推导出窄带波束形成后干扰抵消器（简称ＰＩＣ）的输出信干噪比（ＳＩＮＲ（Ｗ）的一般表达式。定义了输出信干噪比改善率（ＳＩＮＲＩＲ（Ｗ））．通过ＰＩＣ检测出了运动目标的移动轨迹。通过对窄带ＰＩＣ进行理论分析与研究及计算机模拟分析，本文提出了窄带ＰＩＣ的使用条件及适用范围，解决了窄带ＰＩＣ的使用条件问题①。
The general expression of signal to interference plus noise ratio (SINR (W)) of narrowband beamforming interference canceller (abbreviated PIC) is deduced, and the SINRIR (W) Motion target trajectory.By narrowband PIC theoretical analysis and research and computer simulation analysis, this paper proposed the use of narrowband PIC conditions and the scope of application to solve the narrowband PIC conditions of use problems ①.