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| Eliminating the Influence of Moiré Fringes on Upper Atmospheric Wind Measurement Accuracy in GBAII-DASH |
| HUI Ning-ju1, 2, WANG Yan-long1, LI Wen-wen1, LIU Yang-he3, LI Cun-xia1, 2, ZHANG Yi-shan1, FU Di-di1, TANG Yuan-he1* |
1. School of Science, Xi'an University of Technology, Xi'an 710048，China
2. Key Laboratory of Ultrafast Photoelectric Technology and Terahertz Science in Shaanxi, Xi'an 710048，China
3. School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048，China
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Abstract To enhance the detection accuracy of wind speed in the middle and upper atmosphere, GBAII-DASH (Ground-Based Airglow Imaging Interferometer-Doppler Asymmetric Spatial Heterodyne Spectroscopy) imaging interferometer system was developed. The influence of Moiré fringes generated when the periodic interference of straight fringes produced by the system overlapswith the array CCD detector at a certain coupling angle on the wind measurement accuracy of the system was studied, and the wind measurement accuracy of the system was improved. This paper analyzed the cause of Moiré fringes in the GBAII-DASH system. Using the “Four-point algorithm” and the “Fourier transform method”, the forward wind speed was extracted from the interference patterns containing Moiré fringes generated at different coupling angles. The average relative wind measurement errors were 3.07% and 6.89% respectively, so the “Four-point algorithm” had higher wind measurement accuracy. The spectral analysis method simulated the relationship between the difference in spatial frequency between the Moiré fringes and the interference fringes of the GBAII-DASH system and the CCD detector. It was found that increasing the difference could improve the influence of the Moiré fringes on the wind measurement accuracy.The laboratory obtained two types of interference patterns with and without moiré fringes. The wind speed measurement results detected outdoors were compared with the observations of the satellite instrument TIDI (Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics Doppler Interferometer) passing over Xi'an at an altitude of 90~100 km. It was found that the wind speed error of the GBAII-DASH and TIDI in detecting the atmosphere above Xi'an at 90~100 km was only 0.3 m·s-1. Thus it can be seen that eliminating the moiré fringes and then using the “Four-point algorithm” greatly improves the system's wind measurement accuracy.
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Received: 2024-09-24
Accepted: 2025-03-20
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Corresponding Authors:
TANG Yuan-he
E-mail: ltp1801@163.com
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