[1] [1] Gerrard A J, Kane T J, Meisel D D, et al. Investigation of a resonance Lidar for measurement of thermospheric metastable helium[J]. Atmos Solar-Terr Phys, 1997, 59(16): 2023-2035.

[2] [2] Carlson C G, Dragic P D, Price R K, et al. A narrow linewidth Yb fiber-amplified-based upper atmospheric doppler temperature Lidar[J]. IEEE J on Sel Topics in Quantum Elec, 2009, 15(2): 451-461.

[4] [4] Hodgman S S, Dall R G, Byron L J, et al. Metastable helium: a new determination of the longest atomic excited-state lifetime[J]. Phys Rev Lett, 2009, 103(5): 053002.

[5] [5] Han Yuli, Sun Dongsong, Han Fei, et al. Demonstration of daytime wind measurement by using mobile Rayleigh Doppler Lidar incorporating cascaded Fabry-Perot etalons [J]. Opt Express, 2019, 27(23): 34230-34246.