非线性接收系统的双音互调特性  

Analysis of dual-tone inter-modulation characteristics in nonlinear receiving system

作　　者：张财生[1] 何友[1] 丁家会[2] 

机构地区：[1]海军航空工程学院信息融合技术研究所,山东烟台264001 [2]南京电子技术研究所,江苏南京210013

出　　处：《系统工程与电子技术》2008年第8期1464-1467,共4页Systems Engineering and Electronics

基　　金：国家自然科学基金(6067213960672140);全国优秀博士学位论文作者专项资金(200237);教育部新世纪优秀人才计划(NCET-05-0912)资助课题

摘　　要：对雷达接收系统的非线性特性分析,若只把系统等效为理想的无记忆性模型,则得到的结论与其实际性能差别较大。针对有别于一般只讨论接收系统的幅度非线性失真的情况,利用具有记忆性非线性失真模型,分别探讨了系统各失真分量对系统性能的影响,指出了同频寄生输出分量的双重属性。同时澄清了关于三阶截点的模糊认识,最后分析并给出了是否考虑系统记忆特性的依据。It is not effective for people just to take an ideal memoryless model as a mathematical representa- tion of the passive receiving system when analysing its nonlinear distortion. Instead of discussing the nonlineari- ty only, a memory model of nonlinear systems concentrated on the characteristics of nonlinear distortion from a practical perspective is proposed, and the most widely used figures of merit are identified by dual-tone tests. Then the influence of each polynomial of the system output during dual-tone tests is analyzed, and the dual roles of the co-channel distortion are demonstrated. Furthermore, the AM--AM and AM--PM characteristics are il- lustrated and the three-order interceptive point concept is clarified. The criterion that whether the system can be considered as a memory model or memory less is proposed in the end.

关 键 词：非线性接收系统 互调失真 三阶截点 同频寄生失真 

分 类 号：TN850[电子电信—信息与通信工程]