脉冲雷达中频采样系统的镜频抑制性能分析与参数设计

Performance Analysis of Mirror Frequency Rejection and Parameter Design for Intermediate Frequency Sampling System of Pulse Radar

本文研究了脉冲雷达信号包络对中频采样的影响 ,重点分析了非理想包络对镜频抑制的影响 ,主要是产生镜频、幅度损失 ;作为一种特例 ,详细研究了简单脉冲信号矩形包络边沿对镜频抑制的影响 ;分析了不同系统参数对镜频抑制的影响 ,以保证脉冲边沿特性 ,并尽可能减少镜频影响 .

The influence of the envelope of pulse radar signal on the intermediate frequency sampling is investigated, especially the influence of non-ideal envelope on mirror frequency rejection is studied, and the main influences of mirror frequency and amplitude loss are pointed out. As a special case, the effect of rectangular-envelope-edge of pulse signal on intermediate frequency sampling is carefully studied. The influence of different parameters on mirror frequency rejection is analyzed to ensure the pulse edge character after intermediate frequency sampling and to reduce mirror frequency as much as possible. Moreover, the influence of mirror frequency rejection of intermediate frequency sampling is researched for linear modulated frequency pulse signal.