The invention discloses a self-adaption anti-coherent interference technology based on characteristic component rejection. Firstly, characteristic
decomposition is carried out on an antenna multichannel receiving
data covariance matrix to judge the number of a big characteristic value; then, the characteristic vector corresponding to signals and coherent interference is searched in a characteristic
vector group corresponding to the big characteristic value so as to subtract the characteristic vector from the
covariance matrix; finally,
diagonal loading is carried out on the
covariance matrix removing signals and coherent interference components, and the loaded matrix is used for calculating a self-adaption weight, data is weighed, and specific steps are disclosed in the drawing. The method of the invention avoids cancellation of desired signals while inhibiting incoherent interference, does not have
array aperture loss and does not need to master the direction priori information of coherent interference. The method only relates to characteristic
decomposition and inversion operation but does not relate to high-order cumulant operation, so that the method has simple steps and small calculation amount; the device is simple and has low cost. In addition, the method of the invention receives and utilizes the coherent interference as a wanted
signal so as to improve the receiving
gain of a
target signal, thus owning better receiving performance. The method of the invention can be realized only by downloading a program to a general
signal processing board, is easy to popularize and only needs to programme on a programmable
signal processing board; thus, the
system is convenient to
upgrade while the
system structure is not changed. The method of the invention can be widely applied to a
system with various kinds of receiving channel structures and has popularization and application value.