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一、大气透射仪和前散射仪的RVR对比图1和图2分别为2000.12.15(UTC时间)0900～1045和2000.10.29(UTC时间)23:34～00:33两次有雾天气时大气透射仪和前散射仪输出的RVR值。从图1,图2,图3可以看出,大气投射仪和前散射仪所采集的数据具有以下几个特点: 1.大气投射仪和前散射仪所获取的RVR值都与跑道灯光强度成正比,而且同步较好; 2.当前散射仪RVR小于200米时,大气投射仪的RVR值要小于前散射仪; 3.当前散射仪RVR大于800米时,大气投射仪的RVR值要明显大于前散射仪; 4.大气投射仪和前散射仪的RVR值在600米附近比较接近。二、误差原因简要分析 1.长基线的校准误差一般情况下,在忽略了背景亮度误差之后,长基线的校准误差是最主要的原因,而校准误差又分为
First, the atmospheric transmissometer and front scatter RVR contrast Figure 1 and Figure 2 were 2000.12.15 (UTC time) 0900 ~ 1045 and 2000.10.29 (UTC time) 23:34 ~ 00:33 two foggy weather RVR values output by the atmosphere transmissometer and the front scatterometer. As can be seen from Fig. 1, Fig. 2 and Fig. 3, the data collected by the atmospheric projector and the front scatterometer have the following characteristics: 1. The RVR obtained by the atmospheric projector and the front scatterometer are both proportional to the light intensity of the runway The RVR of the atmospheric projector is smaller than that of the front scatterometer; 3. When the current RVR of the scatterometer is greater than 800 meters, the RVR of the atmospheric projector should be significantly larger than Front scatterometer; 4. The RVR values of the atmospheric and front scatterometers are closer at 600 meters. Second, a brief analysis of the causes of error 1. Long baseline calibration error Under normal circumstances, ignoring the background brightness error, the long baseline calibration error is the most important reason, and calibration error is divided into