Is difficult to construct the shape function on k being well posed and have the continuities on k required by convergence )上适定的形函数并使其在k上具有保证收敛所需的连续性是很困难的。
2.
By means of idea of the quasi - solution the inverse problem is converted into a sequence of well - posed forward problems and an ill - posed system of algebraic equations 应用拟解法的思想，把原问题分解为一系列适定的正问题和一个不适定的线性代数方程组。
3.
The algorithm only needs to solve an ill - posed linear system and a well - posed minimization problem and requires only the knowledge of the near field measurements of the scattered fields due to point source fields at a finite number of incidence and observation points distributed over a limited aperture 该算法只需求解一个不适定的线性系和一个适定的非线性最小化问题，而且只需要点源入射场的散射场在某个有限孔径中若干有限个入射和测量点上的近场测量信息。
