Blind identification method for linear block codes of satellite link

The invention relates to a blind identification method for linear block codes of a satellite link. The method sequentially includes the steps: estimating the code length and an initial point based on code weight distribution probability of the linear block codes and the greatest common factor frequency distribution probability of cycle codes; and estimating a check matrix and a generated matrix based on a partial Walsh-Hadamard transformation method and an improved algorithm thereof. The check matrix and the generated matrix of the block codes are identified by the Walsh-Hadamard transformation method, a Walsh-Hadamard transformation value indicates the difference between the number of possible equations and the number of impossible equations in an equation set when an address vector corresponding to the transformation value serves as a solution vector of the equation set, so that the address vector corresponding to the maximum value of the Walsh-Hadamard transformation value is the solution vector of the equation set, and the method is adaptable to conditions with a high bit error rate.