多光谱对地观测激光雷达接收通道选择方法

A Method to Select Receiving Channels for the Multi-Spectral Earth Observation LiDAR

多光谱对地观测激光雷达是一种新型植被监测手段,其应用越来越广泛。现有多光谱对地观测激光雷达系统大多采用光栅分光、多通道光敏阵列探测的数据接收模式。单纯地增加接收通道以提高光谱分辨率、增加接收光谱范围会带来数据冗余、系统集成难度大以及成本过高等问题。讨论了如何确定通道数目并通过闪耀光栅以及中心闪耀波长的选取将特征波长调节至合适通道的中心位置;同时,利用基于主成分分析的特征权重波长修正方法,对落在通道外或不在通道中心位置的特征波长进行修正。在不减少植被光谱信息的前提下,此过程可提高信息接收的有效性,还在一定程度上对波长选择理论进行了补充,提高了多光谱对地观测激光雷达系统在实际应用中的适应性。

A multi-spectral earth observation LiDAR is a new means to monitor vegetation, and its applications are increasingly widespread. The existing multi-spectral earth observation LiDAR system adopts blazed grating and multi- channel photosensitive detector arrays as its data reception mode. Increasing the number of receiving channels only to improve the spectral resolution and receiving range will cause such problems as data redundancy, difficulty in system integration and high cost etc. How to determine the number of channels and bow to adjust the characteristic wavelength just to the center of the appropriate channel by selecting blazed grating and its blazed wavelength is discussed~ in the meantime the characteristic wavelength outside the channel or not at the center of the channel is amended by using the feature weighting method based on the principal component analysis. Thus, not only the effectiveness on receiving information is improved, but also the wavelength selection theory is supplemented to some extent while spectral information of vegetation is not reduced, and the adaptation of the multi-spectral earth observation LiDAR system in practical applications is improved as well.