四孔差分像运动测量大气相干长度的方法研究
Measurement of atmospheric coherent length by four-aperture differential image motion method
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摘要: 介绍了最新研制的基于四孔差分像运动法到达角起伏测量仪，利用该仪器测量的4个方向（两组正交方向）上的到达角起伏方差，从而推算出大气相干长度。在近地面水平路径的实验中发现，不同方向上的测量结果获得的大气相干长度值有一定的差别。测量结果表明：大气湍流存在一定的各向异性，在实际应用中应考虑这个因素；在一些应用场景下，大气相干长度应根据至少一组正交方向的测量结果来分析确定。Abstract: A new kind of angle of arrival fluctuation measurement by differential image motion method(DIMM) is introduced. Fried parameter of two orthogonal base line directions can be obtained by angle of arrival fluctuation variance. The experiment results of horizontal propagation in the real atmosphere show that there are apparent differences between the four coherent length values, and the atmospheric turbulence is anisotropic. This characterization should be taken into account in applications. At least one of the measurement values of four directions is necessary for the analysis and study of determining the atmospheric coherence length.
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Key words:
- atmospheric turbulence /
- dimm /
- atmospheric coherent length /
- statistical characteristics
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