高速运动的微弱目标检测方法研究

Research into The Detection Method of Weak Target with High-speed Motion

对微弱目标的检测通常需要增加相干积累时间来获取信噪比的提高。但随着积累时间变长,目标回波出现距离偏移,回波能量可能分散在相邻的多个距离单元,导致相干积累效果不理想,检测能力难以提升,此现象在目标高速运动时更为明显。介绍了包络插值移位法和时域平移法用于校正距离偏移的原理和实现方法,并通过仿真验证了上述方法的有效性,根据仿真结果从速度搜索精度、积累效果和算法实时性对2种方法进行了对比分析。

The detection of weak targets usually needs to increase the coherent accumulation time to improve the signal-to-noise ratio.However,with the accumulation time becomes longer,the target echo has distance offset,and the echo energy may be dispersed in multiple adjacent distance units,which results in unsatisfactory coherent accumulation effect and difficult improvment of the detection ability.This phenomenon is more obvious when the target moves at high speed.This paper introduces the principle and implementation method of envelope interpolation shift method and timedomain translation method for correcting distance offset,and verifies the effectiveness of above methods through simulation,according to the simulation results,compares and analyzes two methods from the speed search accuracy,accumulation effect and real-time performance of the algorithm.