雷达接收机灵敏度虚拟测试仪

An Virtual Instrument for Testing Sensitivity of Radar Receiver

重点介绍了雷达接收机灵敏度虚拟测试仪的设计原理及实现。它是一种基于工业标准总线(ISA)的插卡式虚拟仪器 ,由主控电路、微波电路、信号驱动电路、内外调制电路、电源滤波电路以及集成于复杂可编程逻辑器件 (CPLD)芯片的接口电路等组成。内含多波段微波信号源、精密衰减器。与虚拟万用表相配合 ,在计算机的控制下 ,可完成雷达接收机灵敏度的测试。为了解决微波信号源的频率定标问题 ,通过分析实验数据和利用最小二乘数值分析方法 。

This paper discusses the chief techniques and design principle of an virtual instrument used for testing sensitivity of radar receiver. The instrument consists of main control circuit, microwave circuit, signal driver circuit, inner and extra modulator circuit, power filter circuit and interface control circuit integrated in CPLD. It embraces multi-waveband microwave source and exactitude attenuator, Controlled by PC, the instrument is used to test the sensitivity of radar receiver. In order to solve the question of frequency scaling of microwave signal generators, a mathematical model of microwave signal frequency scaling is established and a corresponding algorithm is completed by analyzing many groups of experiment data and using least squares method.