水下高重频距离选通成像雷达盲区消除方法

摘要

Underwater range-gated imaging radar can not only eliminate back-scattering noise effectively, but also increase the underwater imaging operation distance. Imaging blind area limit is one of the main defects of the method for inherent delay of system signal processing. An asynchronous control method based on laser pulse is pro⁃posed to perform comparing experiments on high-repetition-rate and low-repetition-rate systems. Experimental re⁃sults show that imaging blind area limit can be removed successfully from underwater high-repetition-rate range-gat⁃ed imaging system by asynchronous control method, but this method would bring gray level jitter to low-repeti⁃tion-rate system. It is one of the reason that the characteristics of underwater high-repetition-rate range-gated imag⁃ing system are better than that of low-repetition-rate system.%水下距离选通成像雷达能够有效消除水体对光源的后向散射，提高水下成像作用距离，但由于系统信号处理固有延迟的影响，成像盲区限制成为这种方法的主要缺点之一。提出了一种基于激光脉冲异步控制的方法，在高重频和低重频两种系统上进行对比实验。研究表明，采用异步控制方法在水下高重频距离选通成像系统上能够成功消除成像盲区限制，但在低重频系统上会带来图像亮度抖动的缺点。这也是水下高重频距离选通成像系统优于低重频系统的原因之一。