“…In [5], a data based coherent compensation method is used for coherent processing, but it is easily influenced by noise due to lack of de-noising process. For the data fusion methods, the available algorithms include nonparametric spectrum estimation [6][7][8][9][10], the parametric spectrum estimation method [1,12,13] and p-norm regularization method [14]. In [6], Burg algorithm is used to find the linear prediction parameters and a iterative procedure is used to improve the estimation of the parameters and the extrapolation of the data, but the gaps between subbands can not be too large.…”