基于真延时的时控阵雷达波束形成方法

摘要

提出一种基于真延时的时控阵雷达方案,并给出时控阵雷达波束形成方法.该方法对信号带宽内所有频率分量实现波程差精确补偿,实现阵元回波的精确延时,解决了宽带相控阵雷达孔径渡越和频率色散的问题.文中以宽带线性调频信号为例进行了仿真.仿真结果表明,基于真延时的宽带时控阵不存在宽带相控阵的孔径渡越和频率色散的问题,提高了宽带阵列的天线增益、方位分辨率和距离分辨率.基于真延时的时控阵雷达波束形成技术对调制信号波形没有要求,可用于各种宽带和超宽带雷达.%A timed array radar program based on real time delay is proposed,followed by the method of beamforming of the timed array radar.The proposed method compensates wave path difference precisely for all the frequency components within the signal bandwidth,which realizes the precise time delay for echoes and solves the aperture transition and frequency dispersion of wideband phased array radars.Simulations are carried out by using the broadband linear frequency modulation signal.The results show that the broadband timed array based on the method of real time delay does not suffer aperture transition or frequency dispersion.Besides,the gain of the wideband array antenna,the azimuth resolution and the distance resolution are improved.The proposed algorithm is suitable for all kinds of wideband and ultra-wideband radars and has broad application prospects,since it has no special requirement for the waveform of the modulated signal.