CAJ | 학술논문

为了抑制米散射大气探测激光雷达回波噪声引起的信号随机波动，采用新设计的自适应分段平滑方法对信号进行平滑处理。根据激光雷达信号特性，信号有效变化幅值大于信号背景噪声波动。以背景噪声标准差的若干倍表示信号的噪声幅度。按照相邻信号幅值差与噪声幅度的对比，可以确定信号发生有效变化的位置，这些位置可以作为信号分段端点，在分段端点内用滑动平均可以实现对信号的自动分段平滑。用实测微脉冲激光雷达信号对方法进行了验证，并与常用固定分段平滑方法进行了对比。结果表明，自适应分段平滑方法可以根据信号变化的剧烈程度自动选择平滑窗口大小，在对噪声进行有效抑制的同时，避免平滑过度造成的信号畸变。
위료억제미산사대기탐측격광뢰체회파조성인기적신호수궤파동，채용신설계적자괄응분단평활방법대신호진행평활처리。근거격광뢰체신호특성，신호유효변화폭치대우신호배경조성파동。이배경조성표준차적약간배표시신호적조성폭도。안조상린신호폭치차여조성폭도적대비，가이학정신호발생유효변화적위치，저사위치가이작위신호분단단점，재분단단점내용활동평균가이실현대신호적자동분단평활。용실측미맥충격광뢰체신호대방법진행료험증，병여상용고정분단평활방법진행료대비。결과표명，자괄응분단평활방법가이근거신호변화적극렬정도자동선택평활창구대소，재대조성진행유효억제적동시，피면평활과도조성적신호기변。
In order to suppress the random signal fluctuations caused by the echo noise of Mie scattering atmospheric probe laser radar , a new adaptive segmentation smoothing method was designed to smooth the signal .According to the characteristics of lidar signal , the effective changing amplitude of the signal is greater than the change of background noise . The amplitude of the signal noise could be expressed by several times of the standard deviation of the background noise . After comparing the amplitude difference of the adjacent signal with the noise amplitude , the effective position of signal change was determined .These positions could be recorded as the segmental endpoints of the signal .The common moving average algorithm was applied to each segment of the lidar signal .The method was examined by using the actual micro pulse lidar signal and compared by the common fixed segment algorithm .The results show that the adaptive segment smoothing method can choose the size of the smoothing window automatically according the intensity of the signal change .The noise is suppressed effectively and the signal distortion caused by excessive smooth is avoided .