Calibrations of ground based airglow imaging interferometer for the upper atmospheric wind field measurement

Tang, Yuanhe; Cui, Jin; Gao, Haiyang; Ouyang, Qi; Duan, Xiaodong; Li, Cunxia; Liu, Lina

doi:10.7498/aps.66.130601

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…(ground based airglow imaging interferometer)成功探测地球上空90 -100 km 的大气风速、温度、密度等信息 [13][14][15] , 通过改进, 利用"四强度法"测风精度能达到4 -6 m/s [16] . 本文将GBAII的两臂换成闪耀光栅, 改造为GBAII-DASH系统, 首次提出用"四强度法"反演GBAII-DASH的大气风速.…”

Section: 本课题组研制的地基气辉成像干涉仪Gbaiiunclassified

A comparative study of three methods to detect the upper atmospheric wind speed by DASH

Li,

Hui,

et al. 2023

Acta Phys. Sin.

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The DASH (Doppler Asymmetric Spatial Heterodyne) is used to detect the upper atmospheric wind velocity by its imaging Fizeau interference fringes. There are two wind measurement methods: Fourier series method (FSM) and popular Fourier transform method (FTM). However, the wind measurement accuracy of FTM is greatly influenced by window function, and the calculation amount is relatively complicated. The Four-point algorithm (FPA) for DASH’ s wind measurement is proposed in this paper. The contents of wind measurement principle, forward modeling, noise and inversion by the FSM, FTM and FPA are wholly compared and researched. The three wind measurement methods are all derived from the phase difference transformation of DASH Fizeau interference fringes. The Fizeau interference fringes with wind speed of 0-100m/s at the interval of 10m/s is simulated, and the forward wind speed is obtained by FSM, FTM and FPA, and the corresponding wind measurement errors are 2.93%, 4.67% and 3.00%,respectively. After artificially adding Gaussian noise with a mean value of 0 and a standard deviation of 0.1, FSM, FTM and FPA are used to forward the Fizeau interference fringes after flat field, and the corresponding relative errors are 2.30%, 11.66% and 2.27% respectively. After artificially adding Gaussian noise, the Fizeau interference fringes of wind speeds of 31-39m/s with 1m/s interval and 30.1-30.9m/s with 0.1m/s interval are simulated, and the forward wind speeds are obtained by FSM and FPA. In both cases, the wind measurement errors of FSM are 3.55% and 4.15% higher than those of FPA. The O(<sup>1</sup>S)557.7nm airglow at peak altitude of 98 km was photographed by our GBAII (Ground based airglow imaging interferometer)-DASH, and the imaging interferograms with zenith angles of 0 ° and 45 ° were obtained. Then by the methods of Fourier series, Fourier transform and FPA were used to obtain the inversion wind speed of 32.21m/s, 43.55m/s and 32.17m/s, respectively. From the forward and inversion results of DASH, we can see that the FPA has a better results for detecting the upper atmospheric wind, for its simple calculation and smaller wind measurement error.

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Section: 本课题组研制的地基气辉成像干涉仪Gbaiiunclassified

A comparative study of three methods to detect the upper atmospheric wind speed by DASH

Li,

Hui,

et al. 2023

Acta Phys. Sin.

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Doppler radial velocity detection based on Doppler asymmetric spatial heterodyne spectroscopy technique for absorption lines*

et al. 2020

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Doppler asymmetric spatial heterodyne spectroscopy (DASH) technique has developed rapidly in passive Doppler-shift measurements of atmospheric emission lines over the last decade. With the advantages of high phase shift sensitivity, compact, and rugged structure, DASH is proposed to be used for celestial autonomous navigation based on Doppler radial velocity measurement in this work. Unlike atmospheric emission lines, almost all targeted lines in the research field of deep-space exploration are the absorption lines of stars, so a mathematical model for the Doppler-shift measurements of absorption lines with a DASH interferometer is established. According to the analysis of the components of the interferogram received by the detector array, we find that the interferogram generated only by absorption lines in a passband can be extracted and processed by a method similar to the approach to studying the emission lines. In the end, numerical simulation experiments of Doppler-shift measurements of absorption lines are carried out. The simulation results show that the relative errors of the retrieved speeds are less than 0.7% under ideal conditions, proving the feasibility of measuring Doppler shifts of absorption lines by DASH instruments.

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Thermal imaging drift monitoring of Doppler asymmetric spatial heterodyne spectroscopy for wind measurement based on segmented edge fitting

Zhang¹,

Feng²,

Fu³

et al. 2022

Acta Phys. Sin.

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Doppler asymmetric spatial heterodyne spectroscopy is recently developed for spaceborne measurement of middle and upper atmospheric wind field, which relies on the accurate inverse of interferogram phase to calculate the Doppler shift of airglow emission lines. The change of temperature leads to thermal deformation of the optical and mechanical components, causing thermal drift of the imaging plane relative to detector, changing the distribution of interferogram phase on pixels, and directly introducing phase errors to affect the wind speed inversion. In order to reduce the influence of imaging thermal drift on phase inversion, this paper uses the segmented fitting method to detect the sub-pixel edges of notch patterns and monitor imaging thermal drift accordingly. In the thermal stability test of a near-infrared Doppler asymmetric spatial heterodyne interferometer prototype, the thermal imaging drifts and ambient temperature showed a high consistency in the trend of high-frequency oscillation, and the correlation coefficient can reach 0.86 after removing the baseline. After phase correct using the thermal imaging shift, the high-frequency oscillation of interferogram phase shift is also greatly suppressed. In order to further verify the accuracy of the algorithm, the influence of the data signal-to-noise ratio and the data distribution characteristic parameter errors used in the fitting on the edge detection was simulated. The results show that the edge detection accuracy is mainly restricted by the data signal-to-noise ratio and the accuracy of the fringe frequency parameters. When the error of the fringe frequency parameter used for fitting is less than 0.5%, the error of other data distribution characteristic parameters is less than 5%, and the data signal-to-noise ratio is more than 35 times, the algorithm in this paper can achieve a detection accuracy higher than 0.05 pixels.

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Calibrations of ground based airglow imaging interferometer for the upper atmospheric wind field measurement

Cited by 4 publications

References 16 publications

A comparative study of three methods to detect the upper atmospheric wind speed by DASH

A comparative study of three methods to detect the upper atmospheric wind speed by DASH

Doppler radial velocity detection based on Doppler asymmetric spatial heterodyne spectroscopy technique for absorption lines*

Thermal imaging drift monitoring of Doppler asymmetric spatial heterodyne spectroscopy for wind measurement based on segmented edge fitting

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