The accuracy of tropospheric temperature measurements with pure rotational Raman (PRR) lidars is affected by the collisional broadening of N2 and O2 PRR lines. In this paper, we intercompare nine calibration functions (CFs) in the traditional PRR lidar technique via simulation. Taking into account the PRR line broadening, the simulation is performed for five sets of spectral filters (SFs) with different passbands in a PRR lidar receiving system. For simplicity of calculations, the transmission function of each SF is approximated by a rectangular function on the wavenumber interval, within which a SF passes the bulk of the backscattered signal intensity in the corresponding PRR lidar channel. A narrow-linewidth laser operating at wavelengths of 354.67 and 532 nm is considered as a lidar transmitter. The CF best suited for tropospheric temperature retrievals from raw PRR lidar data for each set of SFs and laser wavelength is determined by comparative analysis of calibration errors ΔT produced using these CFs. The absolute error |ΔT| does not exceed the value of 3 × 10–3 K when using the best three-coefficient CF, while |ΔT| < 4 × 10–4 K for the best four-coefficient CF regardless of the laser wavelength and SF set used.

中文翻译：

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传统纯旋转拉曼激光雷达技术中不同光谱滤波器通带组校准函数的仿真比较

使用纯旋转拉曼 (PRR) 激光雷达测量对流层温度的准确性受 N2 和 O2 PRR 线碰撞展宽的影响。在本文中，我们通过仿真对传统 PRR 激光雷达技术中的九个校准函数 (CF) 进行了比较。考虑到 PRR 线加宽，对 PRR 激光雷达接收系统中具有不同通带的五组光谱滤波器 (SF) 进行了仿真。为简化计算，每个 SF 的传输函数近似为波数区间上的矩形函数，其中 SF 通过相应 PRR 激光雷达通道中的大部分反向散射信号强度。工作在 354.67 和 532 nm 波长的窄线宽激光器被视为激光雷达发射器。最适合从每组 SF 和激光波长的原始 PRR 激光雷达数据中反演对流层温度的 CF 是通过对使用这些 CF 产生的校准误差 ΔT 的比较分析来确定的。绝对误差|ΔT| 使用最佳三系数 CF 时不超过 3 × 10–3 K 的值，而 |ΔT| < 4 × 10–4 K 对于最佳四系数 CF，无论使用的激光波长和 SF 设置如何。