<FONT face=Verdana>A self-calibration algorithm (SAL: self-calibration algorithm for L-shaped array) is presented for L-shaped array in the presence of mutual coupling. The proposed algorithm utilizes special mutual coupling characteristic of L-shaped array to decouple the signal source information (DOA) and coupling coefficients of antenna array so that two kinds of parameter estimations can be realized without any calibration sources. It not only calibrates mutual coupling inside sub-arrays

but also calibrates mutual coupling between sub-arrays. Compared with conventional self-calibration algorithm based on iterative alternating minimization technique

the proposed algorithm transforms joint estimation problem about DOA and mutual coupling coefficients into cascaded estimation problem

which means that we firstly estimate DOA by searching spectrum peak

and then estimate coupling coefficients so as to avoid huge computation because of multi-dimensional search and global convergence problem due to iterative. Simulation results demonstrate that the proposed self-calibration algorithm is characteristic of high accuracy and little computation.