基于Frank编码的抗干扰方法

当干扰从雷达的主瓣方向进入时，采用自适应波束形成算法会导致主瓣波束变形、偏移等问题。针对干扰从雷达主瓣进入的问题，提出了一种对发射波形设计的抗干扰方法。当发射经Frank编码后的信号，利用Frank编码的正交性，构造出匹配滤波器和阻塞滤波器，分别将接收到的数据通过两滤波器，得到两路信号，然后利用自适应对消的方法将干扰抑制掉，从而达到抑制主瓣干扰的目的，通过仿真验证了利用波形设计的方法可有效抑制从主瓣进入的干扰。

Anti-interference method based on Frank coding

When the interference enters from the direction of the main-lobe of the radar, adopting the adaptive beamforming algorithm will lead to problems such as beam distortion and migration of the main-lobe. Aiming at the problem of interference entering from the radar main-lobe, this paper proposed an anti-jamming method based on the design of the transmitted waveform. When the signal encoded by Frank is transmitted, it constructed the matched filter and the blocking filter by using the orthogonality of the Frank code, and passed the received data through the two filters to obtain two signals. Then it suppressed the interference by the adaptive cancellation method, thus suppressed the main-lobe interference. Finally, simulation results show that the method of waveform design can effectively suppress interference from main-lobe entry.