雷达自动增益控制电路硬件设计与实现

摘要

雷达自动增益控制电路的主要作用是对接收到的回波信号进行增益控制，当回波信号弱时，接收机工作于高增益状态；当回波信号强时，接收机工作于低增益状态。本文介绍了一种基于FPGA的闭环AGC电路的软硬件设计，该电路一方面作为雷达接收机跟中心机通信的一个接口，负责接收中心机下发的数据，并上传接收机的自检信息给中心机；另一方面，该电路还接收中频接收机传输过来的中频信号的检波电平，并以此计算接收通道的数控衰减量，然后将衰减量反馈给接收前端和中频接收机进行增益控制。%The main function of radar AGC circuit is to gain control of the echo signal received. The receiver works in high gain state while the signal is weak;and it works in low gain state while the echo signal is strong. This paper introduced a design of closed loop AGC circuit based on FPGA. The circuit receives data from center machine, and uploads the self-checking information to the central machine. It also receives the detection level of the intermediate frequency received from the IF receiver, and calculates the numerical control attenuation for receiving channel, then feeds the attenuation back to the front-end receiver and IF receiver for gain control.