利用波束轮转技术提高风廓线雷达时间分辨率

Improving the time resolution of wind profiler by using beam rotation technology

时间分辨率是风廓线雷达的一个重要指标。根据风廓线雷达工作原理和时间分辨率计算方法,提出一种利用波束轮转技术来提高风廓线雷达时间分辨率的新方法。风廓线雷达使用该方法进行探测时,采用波束优先顺序进行观测,当雷达完成一次完整的观测后,每完成一个波束的观测,将该波束的观测数据替代之前观测数据中该波束的数据,其它波束使用之前的观测数据,组合成一个新的数据后,再进行后续处理。2018年10月1-31日利用L波段风廓线雷达开展了相关观测试验,并将根据两种模式所得结果与探空数据结果进行对比。试验结果表明,使用波束轮转技术可以将风廓线雷达的时间分辨率由6 min提升至1 min,在反演得到的风廓线结果上能够看到明显的变化过程;从与探空数据的对比结果看,使用波束轮转技术得到的大气风场实际情况更加吻合。

Time resolution is an important index of wind profiler.According to the working principle and time resolution calculation method of wind profiler,a new method to improve the time resolution of wind profiler using beam rotation technology is proposed.In this method,the wind profiler observes in the beam prior sequence.When the radar finishes a complete observation,each time it completes the observation of one beam,it replaces the observation data of this beam in the previous observation data,and other beams use the previous data to combine into a new data for subsequent processing.Observation tests were carried out from October 1 to October 31 in 2018 using a certain type of wind profiler,and the data of the two modes were compared with sounding data.The test results show that the time resolution of the wind profile radar can be improved from 6 minutes to 1 minute by using the beam rotation technology,and more obvious change process can be seen on the retrieved wind barbs,and more wind field details can be provided to the users.From the comparison results with sounding data,it can be seen that the atmospheric wind field obtained by using the beam rotation technology is more consistent.