提高近场测量系统隔离度的方法研究  

Design Method of Improving the Near Field Measurement Isolation

作　　者：沈小玲 冯孝斌 张达凯 刘胤凯 张云 冯雨 SHEN Xiao-ling;FENG Xiao-bin;ZHANG Da-kai;LIU Yin-kai;ZHANG Yun;FENG Yu(Science and Technology on Electromagnetic Scattering Laboratory,Beijing 100854,China)

机构地区：[1]电磁散射重点实验室,北京100854

出　　处：《现代防御技术》2020年第1期95-99,共5页Modern Defence Technology

摘　　要：近场电磁散射特性测量中,发射机发出的大功率信号直接或经反射后进入接收机,容易引起接收机阻塞;同时发射信号经功率放大器后波形改变出现较长的拖尾,拖尾信号与经过目标散射后的回波信号叠加后同时进入接收机,回波信号会受到严重影响。如果系统隔离度较差,以上问题将会导致接收机动态范围不足,系统测量能力受到制约。通过采用时域滤波、天线优化设计等给出了一种提高近场电磁散射特性测量收发隔离度、改善低RCS(radar cross-section)测量性能的设计方法。In the measurement of near field electromagnetic scattering characteristics,the transmitter′s high-power signal enters the receiver directly or after reflection,which is easy to cause the receiver block.After power amplifier,emission signal waveform changed and got a long tail,the tail and the target scattering echo signal enter into the receiver at the same time,the echo signal will be seriously affected by the trailing.Above problem will lead to the insufficient of receiver dynamic range and the measuring capability of the system is influenced.A method with time domain filtering and optimization design of antenna is proposed,which improves the receiver isolation of the near-field electromagnetic scattering characteristics of measuring and the low radar cross-section(RCS)measurement.

关 键 词：近场 电磁散射特性 测量 收发隔离 天线设计 接收机 动态范围 

分 类 号：TN959.6[电子电信—信号与信息处理] O441.5[电子电信—信息与通信工程]