脉冲相位编码信号大测绘带合成孔径雷达成像

Wide swath SAR imaging with pulse-phase-codes

在传统单天线体制的合成孔径雷达成像中,存在方位向高分辨率与大测绘带相互制约的关系,以前的方法总是寻求两者的折中.针对这一问题,提出了一种利用脉冲信号相位编码解距离模糊的新方法,在保证方位高分辨的同时实现大测绘带成像.该算法通过引入初始调制相位,利用回波方程建立线性方程组,实现了将产生距离模糊的不同子测绘带回波分离,取得了很好的成像效果.相对于多天线方法解模糊,具有系统复杂度低、容易实现等优点。

For traditional monostatic Synthetic Aperture Radar （SAR）, the wide swath imaging and cross- range resolution are mutually limited. However, conventional approaches are always to make a trade-off between the both. To overcome the problem, a novel algorithm for resolving range ambiguity is proposed by using the technique of Pulse-phase-codes, in which wide swath imaging could be achieved without the loss of cross-range resolution. In the scheme, the geometric model and linear equation are constructed with modulated initial phases to realize range ambiguity. Meanwhile, high quality of SAR imaging could also be achieved. Besides, the proposed algorithm has the advantages of low system complexity and easy implementation. Experimental results by using simulated data confirm the validation of the proposal.