Aperture synthesis sonar , as its name implies , synthesizes an aperture by storing successive echoes obtained from a moving platform and by processing the results as if they had been obtained from a multi - element array enables a high azimuth resolution to be obtained from a physically small array 合成孔径声纳，顾名思义就是通过小孔径物理声阵的匀速直线运动，将沿航迹方向的回波数据相干累加，形成较大的虚拟孔径，从而提高方位分辨率。合成孔径技术相对于常规声纳技术的突出优势在于，它只利用小孔径的物理声阵，就可以得到与径向距离和频率都无关的高方位分辨率。
( 1 ) . here we build the system space geometry model : the transmitter and receiver fly on different platforms and at different height , two flight paths are unparallel . based on the chirp signal and the taylor series , we analyze the range history and synthetic aperture time , then demonstrate the equation of the azimuth resolution about air - born bistatic spotlight synthetic aperture radar , meanwhile we obtain the equations of doppler bandwidth and doppler frequency modulate rate 本文以机载聚束式合成孔径雷达成像作为研究背景,主要完成了以下几方面的工作: ( 1 )建立了一种机载双站聚束式sar空间几何数学模型,对方位分辨力进行了理论分析,进行了数值分析与仿真,讨论了不同条件对双站聚束模式sar系统分辨力的影响。
Based on the doppler effect and pulse coherence technique , synthetic aperture radar ( sar ) breaks through the azimuth resolution limitation imposed by real aperture antenna . in combination with the pulse compression technique , two - dimensional high resolution imagery to distant targets can be realized 合成孔径雷达( sar )利用以多普勒频移理论和脉冲相参为基础的合成孔径技术，突破了实孔径天线对方位向分辨力的限制，与脉冲压缩技术相结合，实现了远距离目标的二维高分辨成像。
Spotlight synthetic aperture radar can efficiently obtain an image with very high azimuth resolution , since its antenna illuminate the fixed target on the ground . bistatic radar is not a new concept and its fundamental principles have been known and demonstrated many years before the development of operational monostatic radar 由于其天线波束始终照射同一目标场景,因此可获得更大的方位多普勒带宽和更高的方位分辨力,但实际上由于受数据处理条件、载体运动误差等因素的影响,方位分辨率的提高是有限的。
