干涉SAR地形重建的视向量正交分解算法比较

Look vector's orthogonal decomposition algorithms for topographic reconstruction by InSAR

在给出GOD算法的另一种形式和MOD算法的改进算法MMOD算法的基础上,对GOD、MOD、MMOD和GUOD算法间的关系进行了研究。理论分析和实验结果表明,4种算法的共同特点是均选择天线的单位速度向量作为一个正交基,在速度向量的法平面内分别选择一对正交单位向量作为另两个正交基,不同特点在于采用了不同的视向量正交分解方法。结果表明,GOD算法、MMOD算法和GUOD算法是等价的,而MOD算法由于在视向量正交分解中采用了平面波模型,是一种近似算法,与GOD算法、MMOD算法和GUOD算法是非等价的。

Another form of GOD algorithm and a modified MOD (MMOD) are derived, then a thoroughly comparative study on GOD, MOD, MMOD and GUOD is made. Analytical and simulation results show that GOD, MOD, MMOD and GUOD algorithms all select the unit velocity vector of the antenna as an orthogonal basis and all select two unit vectors perpendicular to each other as the other two orthogonal bases which lie in the plane normal to the velocity vector, and the difference among them is that different orthogonal decmposition methods are used in the derivation of the algorithms. The results also show that GOD, MMOD and GUOD algorithms are all exact algorithms and equivalent to each other, while the MOD algorithm is an approximate algorithm and nonequivalent to the other three algorithms because the plane wave model has been introduced in the derivation.