Analysis of Observation Performance of a Mobile Coherent Doppler Wind Lidar Using DBS Scanning Mode

Abstract

The Coherent Doppler Wind Lidar (CDWL) is one of the important remote sensing devices for atmospheric boundary layer wind field observation, it has broad application prospects in the fields of meteorological monitoring and warning, air pollution transportation and aviation safety. In order to test the observation performance of the CDWL using Doppler beam-swinging (DBS) scanning mode, description of the CDWL is introduced, and the main influencing factors of the CDWL observation accuracy is studied, the comparative observation experiments were carried out at the Anqing National Conventional Sounding Station (30°37″ N, 116°58″ E) during the course of Typhoon Rumbia (No. 18, 2018) from August 16 to August 26, 2018. The results show that: the wind observation accuracy is determined by the carrier-to-noise ratio (CNR) of the CDWL. In the precipitation conditions, the effective data acquisition rates of 1.5km and 2.0km detection height are only 46.2% and 38.8%, respectively and it was even difficult to continue operation. Under clear sky conditions, it could operate continuously and the effective data acquisition rates of 1.5km and 2.0km detection height were 85.4% and 64.4%. In addition, the correlation of wind direction and wind speed between the CDWL and the conventional sounding system (L-band secondary wind-finding radar) was 1.041 and 0.982, and the consistency is good. Based on the sounding, the wind direction and wind speed errors of the CDWL during the comparison experiment were 0.82m/s and 9.3°.