在脉冲多普勒雷达中,帧内载频通常是恒定不变的,可以采用Keystone 变换校正线性调频(LFM)回波信号的跨距离门走动,以便在距离对齐后进行相参或非相参积累处理。脉间捷变频技术是现代雷达对抗敌方干扰的有效措施,此时帧内各相参脉冲的载频是随机变化的。文中研究了脉间捷变频情况下LFM 回波信号跨距离门走动的Keystone 变换校正问题,首先建立了捷变频LFM 回波信号的模型,然后给出了捷变频情况下的Keystone 变换公式,并进行LFM 回波信号的跨距离门走动校正,最后通过仿真实例对文中方法进行了验证。

In the pulse-Doppler radar, the carrier frequency usually keeps constant in a frame, and the Keystone transform can be used to correct range migration of LFM echoes to perform the following coherent or non-coherent integration processing. The frequency agility technique in the modern radar is an efficient measure to counterwork the hostile jamming, and at the moment the carrier frequencies of coherent pulses in a frame randomly change. The range migration correction based on Keystone transform under the frequency agility is investigated in this paper. The signal model of frequency agility LFM echoes is firstly built, then the Keystone transform formula is given and used to correct range migration of LFM echoes, and finally the effectiveness of above range migration correction method is demonstrated by the simulation example.

TN957.51

南京工业职业技术大学科研基金资助项目(YK21-02-04)