Based on the mean arrival time and temporal broadening of pulsed waves propagating through turbulent media, this study investigates the ionospheric effects induced by irregularity on medium-earth-orbit synthetic aperture radar (MEOSAR) range imaging quality. Considering radar signal two-way propagating through ionosphere irregularity, an analysis model for ionospheric effects induced by irregularities on MEOSAR range imaging quality is established based on the system characteristics of MEOSAR and ionospheric irregularity parameters. The mode extends the application of pulsed waves propagating through turbulent media to the field of synthetic aperture radar (SAR), and it can be used to analyse the effects on MEOSAR induced by both background ionosphere and ionospheric irregularity. The degradation of range image quality, including deterioration of resolution and shift in the image, due to the ionospheric irregularities is analysed. It is found that the effects induced by ionospheric irregularities will be very serious when the inner and outer scales of ionospheric irregularities are small or the fluctuation is strong. Furthermore, the degradation of resolution and the shift of image will become more and more serious with the increase of SAR orbit height. The results can help to evaluate ionospheric irregularity effects on range imaging for MEOSAR and provide a foundation for the design of MEOSAR.

中文翻译：

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电离层不规则对MEOSAR距离成像的影响研究

基于平均到达时间和通过湍流介质传播的脉冲波的时间展宽，本研究研究了不规则引起的电离层对中轨道合成孔径雷达（MEOSAR）范围成像质量的影响。考虑到雷达信号通过电离层不规则性双向传播，基于MEOSAR的系统特征和电离层不规则性参数，建立了不规则性对电离层距离成像质量的电离层效应分析模型。该模式将通过湍流介质传播的脉冲波的应用扩展到合成孔径雷达（SAR）的领域，可用于分析背景电离层和电离层不规则性对MEOSAR的影响。测距图像质量下降，分析了由于电离层不规则而导致的分辨率降低和图像偏移。发现当电离层不规则内部和外部尺度较小或波动较大时，电离层不规则引起的影响将非常严重。此外，随着SAR轨道高度的增加，分辨率的下降和图像的偏移将越来越严重。研究结果可帮助评估电离层不规则性对MEOSAR距离成像的影响，并为MEOSAR的设计提供基础。结果发现，当电离层不规则的内外尺度较小或波动较大时，电离层不规则引起的影响将非常严重。此外，随着SAR轨道高度的增加，分辨率的下降和图像的偏移将越来越严重。研究结果可帮助评估电离层不规则性对MEOSAR距离成像的影响，并为MEOSAR的设计提供基础。发现当电离层不规则内部和外部尺度较小或波动较大时，电离层不规则引起的影响将非常严重。此外，随着SAR轨道高度的增加，分辨率的下降和图像的偏移将越来越严重。研究结果可帮助评估电离层不规则性对MEOSAR距离成像的影响，并为MEOSAR的设计提供基础。