557.7nm波段星载探测风场的多普勒非对称差分 干涉仪杂散光分析与抑制

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中图分类号：TH744 文献标志码：A doi： 10.37188/CO.2025-0060 CSTR：32171.14.CO.2025-0060

Analysis and suppression of stray light in Doppler asymmetric spatial heterodyne interferometer for spaceborne wind field detection at band

LIU Zi-wei'， JIANG Lun1，2*，HE Xin-tong12， WANG Ruo-qing1.2 （1.School of Opto-Electronic Engineering， Changchun University of Science and Technology， Changchun 130022， China; 2.Institute ofSpace Photoelectrics Technology， Changchun University of ScienceandTechnology，Changchun13oo22，China） * Corresponding author，E-mail： jlciomp@l63.com

Abstract： The impact of atmospheric background radiation on imaging quality in wind field detection by the Doppler Asymmetric Spatial Heterodyne （DASH） interferometers is investigated，and a stray light suppression structure is designed. Utilizing orbital parameters and observation geometry，the influence of atmospheric background radiation on the signal-to-noise ratio （SNR） at varying altitudes is analyzed. Subsequently， a baffle is designed by considering system parameters and SNR variation patterns， with its suppression efficacy evaluated via point source transmitance （PST）. The results demonstrate that atmospheric background radiation intensifies with decreasing altitude，leading to progressive SNR degradation. PST curves indicate that in-field PST is stableand unaffected by the baffle，preserving target light detection capability. Out-of-field PST decreases with increasing off-axis angle， dropping below 10-8 near the critical stray light suppression angle of 1.07∘ . The proposed suppression design fulfills system requirements for atmospheric background radiation mitigation.

Key Words： atmospheric background radiation; stray light; signal-to-noiseratio; baffle; point source transmittance

1引言

多普勒非对称差分（DASH）干涉仪依托卫星平台，通过使用临边观测方式探测中高层大气中广泛分布的可见气辉光，从而获得连续的风场廓线，是干涉光谱技术在卫星遥感领域的应用拓展，也是中高层大气风场探测领域的重要研究方向[1-2]。（剩余12632字）