无线互联科技
無線互聯科技
무선호련과기
WUXIAN HULIAN KEJI
2015年
5期
139-142
,共4页
电离层%P波段%合成孔径雷达%分辨率
電離層%P波段%閤成孔徑雷達%分辨率
전리층%P파단%합성공경뢰체%분변솔
Ionosphere%P-band%Synthetic aperture radar%Resolution
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。
文章分析瞭信號載頻、帶寬、電離層總電子量（Total Electronics Content,TEC）以及閃爍彊度等因素對于P波段閤成孔徑雷達（Synthetic Aperture Radar，SAR）成像分辨率的影響，併進行瞭點目標成像倣真研究。倣真結果錶明，在電離層中傳播時SAR距離嚮分辨率與信號載頻、帶寬以及電離層總電子量大小密切相關，同時會導緻SAR距離嚮圖像偏移；方位嚮分辨率受電離層閃爍效應的影響，隨著閃爍彊度的增彊，方位嚮分辨率逐漸降低，噹處于彊閃爍條件下時，方位嚮無法成像。
문장분석료신호재빈、대관、전리층총전자량（Total Electronics Content,TEC）이급섬삭강도등인소대우P파단합성공경뢰체（Synthetic Aperture Radar，SAR）성상분변솔적영향，병진행료점목표성상방진연구。방진결과표명，재전리층중전파시SAR거리향분변솔여신호재빈、대관이급전리층총전자량대소밀절상관，동시회도치SAR거리향도상편이；방위향분변솔수전리층섬삭효응적영향，수착섬삭강도적증강，방위향분변솔축점강저，당처우강섬삭조건하시，방위향무법성상。
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.
