中频采样正交双通道处理的VHDL实现

Implementation of Quadrature Channel Processing System with IF Digital Sampling based on VHDL

针对模拟视频正交双通道处理中容易产生镜像频率等不平衡问题,介绍了中频采样正交双通道处理的数字正交技术,基于VHDL语言编程实现了某雷达接收机中的正交双通道处理系统并进行了系统功能仿真,仿真结果表明,系统最高工作频率可达86.2MH z;I、Q通道正交相位误差eφ≤0.144 1;°镜像抑制比可达60dB,完全可以满足现代雷达接收机的设计要求,文中的理论分析及实现方法为工程应用提供了良好的参考。

In this paper, the IF digital quadrature sampling technique is introduced to overcome the mirror image frequency problem of two branches of the analogue quadrature detector, and the radar receiver quadrature channel processing system was realized and simulated base on VHDL. the simulation results showed that the highest work frequence reaches to 86.25MHz. The quadrature phase errors φe≤is≤ 0. 144 1° and the abatement to mirror frequency suppression ratio reaches to 60dB,and it can perfectly meet the design demand of the modern radar receiver. The technique and the realization way introduced in the paper offers a good reference for the engineering application.