摘要
为了给低空飞行安全气象服务奠定基础,根据2015年7~9月国内新研制的全光纤相干激光测风雷达,联合边界层风廓线雷达和双经纬仪探空气球在我国东北某地获取的探测实验资料,对比了晴天、阴天、雾霾天和雨天4种天气类型下激光测风雷达和风廓线雷达与探空气球风场探测的相关性,以评估激光测风雷达的测风精度和稳定性。结果表明,晴、阴和雾霾天条件下,激光测风雷达测风精度优于风廓线雷达,其水平风与真值误差的标准差低于风廓线雷达的一半;雨天条件下,激光测风雷达探测高度受限,最大可测高度仅为风廓线雷达的一半,表明其风场探测受降水衰减影响比风廓线雷达严重。激光测风雷达测风稳定性优于风廓线雷达,垂向连续高度上其与真值的相关系数变化小且均达到0.9以上。晴、阴和雾霾天条件下,两种雷达测风精度均受大气风速变化影响,且随大气风速增加呈不同变化趋势。
For the foundation of low altitude flight safety service, based on the detection database collected at the northeast of China form July to September in 2015 and using a Chinese new all-fiber coherent wind lidar combined with a double theodolite pibal and wind profile radar, the wind measurement precision and reliability of this new wind lidar are evaluated by comparing the correlation of laser radar, the wind profile radar and pibal wind detection under clear-air, cloudy, foggy and hazy, and rainy conditions. The results show that, under clear-air, cloudy, foggy and hazy conditions, the wind lidar is more accurate than the wind profiler lidar, and the standard deviation between horizontal wind and real value error is less than a half of wind profiler lidar. During the rainy day, the detection range of wind lidar is limited, and the maximum observed altitude decreases to only half of the wind profiler which shows a severe influence compared with wind profiler under percipitation. The wind lidar results aremore stable than that of the wind profiler. The dataset correlation coefficient, which can reach up to 0.9, between the measured data detected by the wind lidar and the real value has a tiny change. Under clear-air, cloudy, and fog and hazy conditions, the wind accuracy of two iidar are both affected by the variation of wind speed, meanwhile, the change trends are different as the wind speed increases.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2017年第2期320-329,共10页
Chinese Journal of Lasers
基金
国家自然科学基金(91537214
91437113)
关键词
遥感
探测性能
相干激光测风雷达
风廓线雷达
remote sensing
detection performance
coherent Doppler iidar
wind profile radar
