The 1-DOA estimation algorithm is used to estimate azimuth of signals. DML (Determined Maximum Likelihood) is a kind of algorithm for parameter estimation of determined narrowband signals, which theoretically has advantages of high precise as well as high suppression to strong noise and coherent signals. However, there are problems of high computation complexity and local convergence. Therefore, the algorithm named FPSO-DML (Fission Particle Swarm Optimization-DML) is put forward in this paper, which could get accurately global optimum root of DML function at a cost of low computation. Then, the wideband signal is decomposed into narrowband signal at different frequency by FFB, which is used to estimate 1-DOA by FPSO-DML algorithm. Simulations prove that the RMSE curve of proposed algorithm approach CRB of DML algorithm, and having strong ability of tolerating coherent wideband signals.
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