Image Combination Analysis in SPECAN Algorithm of Spaceborne SAR

An analysis of image combination in SPECAN algorithm is delivered in time-frequency domain in de-tail and a new image combination method is proposed. For four multi-looks processing one sub-aperture data in every three sub-apertures is processed in this combination method. The continual sub-aperture processing in SPECAN algorithm is realized and the processing efficiency can be dramatically increased. A new parameter is also put forward to measure the processing efficient of SAR image processing. Finally, the raw data of RADARSAT are used to test the method and the result proves that this method is feasible to be used in SPECAN algorithm of spaceborne SAR and can improve processing efficiently. SPECAN algorithm with this method can be used in quick-look imaging.     

星载SAR多项式拟合插值处理及误差分析

在分析SAR Range-Doppler算法的基础上，给出了其sinc插值的多项式拟合简化算法，该算法可以在保持图像质量的情况下，较大地减少计算量。提出采用Taylor展开和最小二乘法来确定多项式系数的两种拟合方法，并给出了误差分析和比较。最后采用RADARSAT的实测数据对插值算法进行了验证，仿真结果证明，文中给出的插值方法，对于实时性要求较高的系统有重要意义，可以应用于SAR实时信号处理中。     

一种改进的部分Hausdorff距离检测技术和遗传算法在图像匹配识别中的应用

本文提出一种改进的部分Hausdorff距离作为模板和图像中物体轮廓相似性的测度,较大地减少计算量。同时把遗传算法引入图像匹配识别。由于GA的高并行性和鲁棒性,可以较快地完成全局搜索,而不会陷入局部最优,因此GA和改进的Hausdorff距离相结合能有效地检测出具有平移、旋转和尺度变化的物体,以达到模板和图像间的有效匹配。