飞行时间对保形穹顶航空光学成像质量下降的影响

Jiaqian Yu
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引用次数: 0

摘要

当导弹高速飞行时,由于气光效应,共形穹顶的表面形状和折射率会发生变化,从而导致不同飞行时间的成像质量不同。因此,研究飞行时间对保形穹顶航空光学成像质量下降的影响具有重要意义。本文以空空导弹为例,采用 Zernike 多项式、图像仿真和峰值信噪比(PSNR)等方法,评估了飞行时间范围为 0-10 s 的椭圆穹顶在不同条件下的气动光学成像质量退化情况。模拟结果表明,随着飞行时间的增加,(1) 倾斜、散焦、散光和昏迷的动态范围增大;(2) 模拟图像的 PSNR 下降。因此,飞行时间对椭球穹顶航空光学成像质量下降的影响是逐渐严重的。
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Influence of flight time on aero-optical imaging quality degradation of the conformal dome
When the missile is flying at high speed, the surface shape and refractive index of the conformal dome will change due to the aero-optic effect, which results in different image quality at different flight times. Hence, it is of great significance to study the influence of flight time on aero-optical imaging quality degradation of the conformal dome. Taking an airto- air missile as an example, this paper uses Zernike polynomials, image simulation, and peak signal-to-noise ratio (PSNR) to evaluate the degeneration of the aero-optical imaging quality of an ellipsoid dome with a flight time range of 0-10 s under varying conditions. The simulation results show that, with the increase of flight time, (1) the dynamic range of tilt, defocus, astigmatism, and coma increase; (2) the PSNRs of the simulated images decrease. Therefore, the effect of flight time on the aero-optic imaging quality degradation of the ellipsoidal dome is gradually serious.
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