<FONT face=Verdana><FONT face=Verdana>For the robust adaptive beamforming problem of the space distributed signal models

a robust beamforming algorithm for general signal models is proposed.Not only the closeform solution is found

but also the optimal performance improvement can be obtained.Therein

the relationship of the proposed algorithm with the traditional diagonal loading is analyzed

and the optimal loading level can be computed exactly

the solution with the optimal negative loading has the optimal performance.The last simulation attests its correctness and effectiveness

andindicates that the optimal weight vector is only determined by the given received data and the unknown mismatch

and is independent of the mismatch constraint parameter

but the mismatch constraint parameter is the adjective parameter for the optimal weight computing.