电子学报
電子學報
전자학보
ACTA ELECTRONICA SINICA
2013年
9期
1863-1868
,共6页
曾祥能%刘宪勋%白洁%张永顺
曾祥能%劉憲勛%白潔%張永順
증상능%류헌훈%백길%장영순
星载合成孔径雷达%多波束-多相位中心%多维波形编码%高分辨宽测绘带成像
星載閤成孔徑雷達%多波束-多相位中心%多維波形編碼%高分辨寬測繪帶成像
성재합성공경뢰체%다파속-다상위중심%다유파형편마%고분변관측회대성상
space borne SAR%multiple beams-multiple phase centers%multidimensional waveform encoding%high resolu-tion wide swath imaging
通过方位向多波束与多相位中心结合,采用方位向-快时间二维波形编码发射技术获得了星载SAR系统高分辨-宽测绘带成像的优良性能。所提方案在发射端的方位向采用脉内扫描形成多个方位窄波束,以减小子多普勒带宽,距离向通过波束展宽获得宽测绘带;在接收端沿距离-方位向形成多个等效相位中心,通过俯仰DBF技术分离各子波束回波信号来抑制距离模糊,方位向通过谱重构方法解方位多普勒模糊,并通过多个子多普勒谱拼接获得方位高分辨。文中研究了本系统的主要系统参数典型设计及性能优势。仿真结果表明,该系统能有效的完成高分辨-宽测绘带任务,相对已有的其它星载SAR系统,系统性能优势明显,系统结构更加轻便灵活。
通過方位嚮多波束與多相位中心結閤,採用方位嚮-快時間二維波形編碼髮射技術穫得瞭星載SAR繫統高分辨-寬測繪帶成像的優良性能。所提方案在髮射耑的方位嚮採用脈內掃描形成多箇方位窄波束,以減小子多普勒帶寬,距離嚮通過波束展寬穫得寬測繪帶;在接收耑沿距離-方位嚮形成多箇等效相位中心,通過俯仰DBF技術分離各子波束迴波信號來抑製距離模糊,方位嚮通過譜重構方法解方位多普勒模糊,併通過多箇子多普勒譜拼接穫得方位高分辨。文中研究瞭本繫統的主要繫統參數典型設計及性能優勢。倣真結果錶明,該繫統能有效的完成高分辨-寬測繪帶任務,相對已有的其它星載SAR繫統,繫統性能優勢明顯,繫統結構更加輕便靈活。
통과방위향다파속여다상위중심결합,채용방위향-쾌시간이유파형편마발사기술획득료성재SAR계통고분변-관측회대성상적우량성능。소제방안재발사단적방위향채용맥내소묘형성다개방위착파속,이감소자다보륵대관,거리향통과파속전관획득관측회대;재접수단연거리-방위향형성다개등효상위중심,통과부앙DBF기술분리각자파속회파신호래억제거리모호,방위향통과보중구방법해방위다보륵모호,병통과다개자다보륵보병접획득방위고분변。문중연구료본계통적주요계통삼수전형설계급성능우세。방진결과표명,해계통능유효적완성고분변-관측회대임무,상대이유적기타성재SAR계통,계통성능우세명현,계통결구경가경편령활。
This paper introduces a new waveform encoding technology on azimuth-fast time domain for space borne synthetic aperture radar (SAR ) ,this technology can obtain high resolution wide swath imaging capacity by combining the azimuth multiple beams with multiple phase centers .On the transmitter ,intrapulse scanning technolog is utilized to form multiple narrow beams on az-imuth in this system ,which can reduce the sub-doppler bandwidth ,and the elevation beam is widened for wide imaging swath .On the receiver ,multiple equivalent phase centers are produced both on azimuth and elevation ,the range ambiguity is deducted as the result of multiple sub-waveforms separated by digital beam-forming (DBF ) on elevation ,and the azimuth doppler ambiguity is de-ducted by doppler spectral reconstruction method .Finally ,the multiple sub-doppler spectra are combined to achieve high azimuth resolution .Moreover ,the primary system parameters and performance advantage are analyzed .Simulation results confirm this new system can fulfill high resolution wide swath imaging ,also within condensed configuration than other space borne SAR system .