地表海拔高度对激光大气透过率影响的研究

Effect of ground altitude on laser atmospheric transmittance

为了研究地表海拔高度对激光大气透过率影响,利用Pc Mod Win大气传输软件分析了不同地表海拔高度(GNDALT)对晴朗天气激光大气传输透过率的影响。结果表明:激光发射时的地表海拔越高,透过率越大;大气能见度(visibility,VIS)仅在地表海拔高度以上的边界层(厚度缺省为2 km)内影响激光透过率,传输高度超出此范围后影响消失。利用软件合理设置地表海拔高度与气象边界层厚度,模拟激光实际发射的地理环境,可估算激光传输透过率,对提高制导精度具有重要的参考价值。

In order to study the effect of ground altitude on laser atmospheric transmittance, the transmittance of various ground altitude （GNDALT） under the fine weather was analyzed by using PcModWin atmospheric transmission software. The results show that the higher ground altitude of the emission laser, the larger the transmittance. The effect of atmospheric visibility （VIS） on the laser transmittance is only in the boundary layer （the default is 2km）, and the visibility has no effect when transmission height goes beyond this range. Through setting up ground altitude and the thickness of the boundary layer reasonably to simulate the real environment by using the PcModWin software, the transmittance of the laser can be estimated. It has important reference value for the improvement of the guidance precision.