GIS partial discharge positioning method based on truncated singular value decomposition

The invention discloses a GIS partial discharge positioning method based on truncated singular value decomposition. The method comprises the following steps of S1, establishing a mathematical model based on time difference of arrival partial discharge positioning; S2, a linear positioning equation set PX=Q being obtained through a spherical surface conversion method; S3, performing centralized pretreatment on the linear positioning equation set PX=Q to obtain a centralized positioning equation set PX = Q'; S4, performing decomposition calculation on the matrix P by applying a principal component triangular decomposition method to obtain an equivalent matrix P'of the matrix P'; S5, the matrix P' being substituted into a positioning equation set PX=Q', and an equivalent linear equation set P'X=Q' being obtained; S6, performing singular value decomposition on the matrix P' to obtain two orthogonal matrixes U=(u1,..., un) and V=(v1,..., vn) of the matrix P', and designing a filtering factor fi; and S7, solving P'