基于数字信号处理和可编程逻辑门阵列的S波段雷达主板设计

为了提高S波段微波多普勒雷达系统的控制精度与接收性能,同时将控制与接收融合到一起,基于数字信号处理和可编程逻辑门阵列(DSP+FPGA)设计了S波段系统雷达主板,其作为雷达系统中的控制与接收中心,可以根据上位机命令产生精准的时序控制信号,同时对中频回波信号进行采样、下变频、存储和上传等。通过后期性能测试,雷达主板产生的时序控制信号精准,接收性能良好,灵敏度达-94 dBm,无杂散动态范围达50 dB,闭环测试下,在输入中频回波信号幅度为-17 dB时,多普勒谱信噪比达70 dB,因此设计的雷达主板完全满足S波段多普勒雷达系统的要求。

Design of S-band radar motherboard based on DSP and FPGA

To improve the control accuracy and receiving performance of S-band microwave Doppler radar system, a novel radar main board is designed as the control and receiving center of the radar. The main board is composed of DSP and FPGA and performs precise timing control, AD conversion, digital down conversion, data storage and upload. The test results indicate an excellent accuracy of timing signal as well as a good sensitivity of -94dBm. It also has a 50dB SFDR. In close loop test, the main board yields a 70dB SNR of a Doppler spectrum with a -17dBm IF input. The main board proposed in this paper meets the standard of the S-band Doppler wave radar system.