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首页> 外文会议>International symposium on photoelectronic detection and imaging;ISPDI 2011 >Assessment of a1 three-frequency alternate pulse Doppler wind lidar
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Assessment of a1 three-frequency alternate pulse Doppler wind lidar

机译：a1三频交变多普勒测风激光雷达的评估

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摘要

Incoherent Doppler wind lidar measures the wind by detecting the frequency shift of the laser backscattering from aerosol and atmosphere molecules. The wind measurement sensitivity of edge detection technology like iodine vapor filter depends on the aerosol load of probe volume. The current Direct detect wind lidar system has to obtain the measurement sensitivity from the independent measurement or prior atmosphere aerosol data before accurate wind retrieval. Otherwise, the variation of aerosol mixing ratio would introduce great uncertainty in the wind speed measurement, which is unacceptable on airborne and space-borne Doppler lidar. This paper proposes a new method to achieve real-time wind speed calibration by three adjacent frequency laser pulses alternately transmitted. Three laser pulses are frequency locked to the middle and two wings of the iodine filter absorption line. Because the frequency of triple pulses is changing rather fast, it can be approximately regarded as a synchronous measurement of both aerosol mixing ratio and wind speed. By this way, we can not only ensure the wind measure accuracy, but also achieve the reliable wind field measurement on a mobile platform.
机译：非相干多普勒测风激光雷达通过检测激光从气溶胶和大气分子向后散射的频移来测量风。边缘检测技术（如碘蒸气过滤器）的测风灵敏度取决于探头体积的气溶胶负荷。当前的直接检测风激光雷达系统必须从独立的测量值或先前的大气气溶胶数据中获得测量灵敏度，然后才能进行精确的风能检索。否则，气溶胶混合比的变化将在风速测量中引入很大的不确定性，这在机载和太空多普勒激光雷达上是无法接受的。本文提出了一种新的方法，该方法通过交替发送三个相邻频率的激光脉冲来实现实时风速校准。三个激光脉冲频率锁定在碘滤光片吸收线的中部和两个侧翼。由于三次脉冲的频率变化非常快，因此可以近似地将其视为气雾混合比和风速的同步测量。这样，我们不仅可以保证测风精度，而且可以在移动平台上实现可靠的风场测量。

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