星载面阵SAR多维波形编码技术研究

摘要

In order to solve contradictions between high azimuth resolution and wide swath or signal to noise ratio (SNR) , a multi-dimensional waveform coding (MDWC) technique for planar array SAR system is proposed, in which the planar array is divided into multiple sub-apertures as rows and columns, meanwhile the imaging swath in range dimension is divided into multiple sub-swath, the sub-swaths are scanned in intra-pulse, and the sub-pulse signal for given sub-swath is coded in frequency domain, the whole system works in low PRF. On the receiver side, multiple phase centers in azimuth is utilized to resolve Doppler ambiguities, the new system can acquire obvious abilities such as wide swath, high resolutions and high signal to noise ratio, and so on. The simulation results verify the effectiveness of the proposed method.%为解决传统高分辨和宽测绘带以及高信噪比和宽测绘带之间的矛盾,采用面阵合成孔径雷达(SAR)多维波形编码(Multi-Dimensional Waveform Coding,MDWC)技术,提出了将面阵分为多行多列的子孔径,将距离维测绘带分成多个子测绘带进行脉内扫描照射,同时对子测绘带内子脉冲信号进行频分编码,并采用低PRF发射,接收端则利用方位向多个相位中心解多普勒模糊,获得宽测绘带、高分辨与高信噪比等多项性能,仿真试验表明了方法的有效性.