无源功分网络与模数转换器对雷达接收系统噪声的影响

Effect of Passive Power Distribution and Synthesis Network and ADC on Radar Receiver System

对无源功分网络及模数转换器(ADC)在雷达接收系统中的噪声影响做出详细的理论分析和公式推导,提出ADC在链路指标计算时的简化模型,并以直采链路为例,针对不同的工作状态和可能发生的故障情况,对含有无源功分网络及ADC的接收系统链路进行增益与噪声理论推导和测试验证,明确无源功分网络及ADC对系统噪声的影响与贡献,使得在接收系统出现故障时,能够进行快速、准确的故障定位。

Theoretical analysis and formula derivation of the effect of passive power distribution and synthesis network and analog to digital converter (ADC) on the noise in the receiver system are described. A simplified model in performance calculation of the ADC is proposed. Using an example of direct sampling circuit, the gain and noise of the receiver system with passive networks are theoretically deduced and tested for verification under different conditions. The influence of the passive power network and ADC on the noise is clearly determined, achieving the accurate fault location quickly when there is defaults in the receiver system.