自适应数字波束形成在FMCW雷达中的应用

Application of adaptive digital beamforming in FMCW radar

调频连续波(FMCW)雷达往往通过对回波信号的距离-多普勒处理来提取目标信息。由于电磁工作环境的恶化和大量射频干扰的存在,在极低的信干噪比(SINR)条件下进行目标检测和信息提取十分困难。对于阵列系统,往往采用自适应数字波束形成(ADBF)技术,来抑制强干扰和方向性干扰对有用信号的影响。讨论了在FM-CW雷达中ADBF技术的应用问题,结合两种不同的距离-多普勒处理方法,提出了相应的ADBF系统实现方案。分析表明,该方案是有效可行的,它将显著改善FMCW雷达的信干噪比,提高雷达对目标信号的检测性能。

In frequency modulation continuous wave （FMCW） radar, the target information is usually extracted by Range-Doppler processing. As the working environment of electromagnetism gets deteriorative and a great deal of jammings exist, target detection and information extraction at very low SlNR are difficult. For array systems, the technique of adaptive digital beamforming （ADBF） is adopted to restrain the strong interfere or directional jamming. The application problem of ADBF in the FMCW radar is discussed, and the system schemes of ADBF combining with two different Range-Doppler processing methods are proposed. It＇ s proved that the schemes are feasible and effective, and the SINR and detection performance of FMCW radar can be improved markedly.