大气后向散射比对风速测量的影响

 采用同时测量Rayleigh散射和Mie散射混合信号的多普勒频移的单边缘技术，探测低空中（<12 km）的大气风速。由于大气后向散射比R_b值的变化，导致测量结果有很大的误差。详细分析了Rb值的变化对风速测量灵敏度及测量结果的影响，并做出了在不同Rb值情况下的风速测量校正曲线。结果表明：随着R_b值的增大，风速测量灵敏度有升高的趋势；随着Rb值偏差的增大，测量的风速误差有增大的趋势；同时，在相同的R_b值偏差情况下，随着径向风速的增大，测量的风速误差也有相应的增大。

Effect of atmospheric back-scattering ratio on measurement of wind velocity

The single-edge technique measuring Doppler shift of Rayleigh-scattering and Mie-scattering simultaneously is presented. The method is used to detect atmospheric wind velocity at low altitude(<12 km). The error of the measurement caused by the atmospheric back-scattering ratio R_b can't be ignored. The measurement sensitivity and results are analyzed. The calibrated curve of wind velocity measurement was calculated under different value of R_b. The results show that the sensitivity tends to increase along with the increase of R_b and the error of measurement increases along with the deviation of R_b. At the same time, the measuremental error tends to increase with the augment of the radial wind velocity under the same deviation of R_b.