Pseudorandom modulation continuous-wave narrowband sodium temperature and wind lidar
Pseudorandom modulation continuous-wave narrowband sodium temperature and wind lidar
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DOI：
10.5194/amt-16-2263-2023
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发表时间：
2023-04
影响因子：
3.8
通讯作者：
X. Fang;Feng Li;Lei Sun;Taohai Li
中科院分区：
文献类型：
--
作者：
X. Fang;Feng Li;Lei Sun;Taohai Li
抽象的。报道了中国科学技术大学研制的第一台伪随机调制连续波窄带钠温和风激光雷达。该激光系统使用1178 nm二极管种子激光器和带有光纤耦合声光移频器（AOFS）的光纤拉曼放大器，以产生在三个频率v0、v+和v−下输出功率为1.5 W的窄带589.158 nm光。基于一种创新的技术和算法，利用M码电光调制器（EOM）调制的主光束和剩余光束分别指向垂直和东向。三频光采用多周期127位M码组进行时序设计。在晴朗天空条件下，垂直分辨率为1 km，时间分辨率为30 min的温度和风的不确定性估计在钠峰处分别为5.0 K和10 m s-1。温度和风场的观测结果与卫星和附近地基流星雷达观测结果吻合较好，证明了PMCW窄带钠激光雷达系统测量中层顶温度和风场的可靠性。
Abstract. We report the first pseudorandom modulation continuous-wave (PMCW) narrowband sodium temperature and wind lidar developed at the University of Science and Technology of China (USTC). The laser system uses a 1178 nm diode seed laser and a fiber Raman amplifier with a fiber-coupled acousto-optic frequency shifter (AOFS) to generate a narrowband 589.158 nm light with an output power of 1.5 W at three frequencies of v0, v+, and v−. Based on an innovative technique and algorithm, the main beam and the residual beam modulated by electro-optic modulator (EOM) with M pseudorandom sequence code (M-code) are separately directed to the vertical and eastward directions. The three-frequency light is designed in timing with the multiple-period 127-bit M-code groups. The uncertainties of the temperature and wind with the vertical and temporal resolutions of 1 km and 30 min under clear-sky conditions are estimated to be 5.0 K and 10 m s−1, respectively, at the sodium peak. The temperature and wind results are in good agreement with those observed by satellite and nearby ground-based meteor radar, demonstrating the reliability of the PMCW narrowband sodium lidar system for measuring the mesopause region's temperature and wind.