基于轨道参数修正的PALSAR-2影像正射校正技术

PALSAR-2 image ortho-rectification based on orbit parameters modulation

对PALSAR-2影像进行正射校正来评估新一代L波段的传感器的应用潜力有重要的意义。校正过程中的轨道参数误差会影响最终的校正精度。基于此,给出一种基于轨道参数修正和RD模型简化解算的PALSAR-2影像校正方法,利用模拟SAR与真实SAR影像的配准,修正轨道参数,再利用修正后的轨道参数与RD模型简化解算,完成校正工作。将该方法同时应用于PALSAR-2和PALSAR影像,并与没有经过轨道参数修正的方法进行比较,结果表明该方法可操作性强,相比于没有经过轨道参数修正的方法有较高的精度,且新一代L波段传感器影像的校正精度更高,这也进一步证实了新一代L波段传感器有更强的性能指标,应用潜力更大。

Evaluation the application potential of the new generation L-band sensor by ortho-rectifying of the PALSAR-2 image has an important significance. The error of orbital parameter in the rectification process will affect the final ortho-rectification precision. To tackle this problem,this paper proposes an ortho-rectification algorithm for PALSAR-2 image based on orbit parameters modulation and simplified calculation. Orbit parameters are modulated by registration of the simulate image and the real image. By using the modulated orbit parameters and simplified calculation of the range doppler（ RD） model,ortho-rectification is performed. The method was applied to PALSAR-2 image and PALSAR image at the same time and it was compared with the PALSAR-2 ortho-rectification image without orbit parameters modulation. The result shows that the algorithm has strong operability and high geometric accuracy and that the new generation L-band sensor image＇s rectification accuracy is higher,which further confirms that the new generation L-band sensor has better performance and greater application potential.