摘要
文章分析了信号载频、带宽、电离层总电子量(Total Electronics Content,TEC)以及闪烁强度等因素对于P波段合成孔径雷达(Synthetic Aperture Radar,SAR)成像分辨率的影响,并进行了点目标成像仿真研究。仿真结果表明,在电离层中传播时SAR距离向分辨率与信号载频、带宽以及电离层总电子量大小密切相关,同时会导致SAR距离向图像偏移;方位向分辨率受电离层闪烁效应的影响,随着闪烁强度的增强,方位向分辨率逐渐降低,当处于强闪烁条件下时,方位向无法成像。
This paper analyzed the relationship between the signal’s carrier frequency, bandwidth, the ionospheric total electronics content（TEC） and scintillation intensity with P band synthetic aperture radar（SAR）’s image resolution. The point target imaging simulation results shown that SAR’s range resolution was closely related with the signal’s carrier frequency, bandwidth and the ionospheric TEC when the wave propagated in the ionosphere, and the ionosphere also caused the SAR image offset in range direction. In addition the azimuth resolution is mainly inlfuenced by the ionospheric scintillation effect, the azimuth resolution decreased rapidly with the enhancement of scintillation’s intensity. While in strong scintillation conditions, the azimuth resolution declined seriously, even could not image.
出处
《无线互联科技》
2015年第5期139-142,共4页
Wireless Internet Technology
关键词
电离层
P波段
合成孔径雷达
分辨率
Ionosphere
P-band
Synthetic aperture radar
Resolution
