STAP implementation method based on sub-beam-sub-Doppler domain dimensionality reduction

The invention relates to an STAP implementation method based on sub-beam-sub-Doppler domain dimensionality reduction. The method comprises the steps that spatial filtering is conducted on array element dimensions of array element-pulse domain echo signals through a sub-array level digital beam forming method, and the array element dimensions are synthesized into a plurality of sub-beam signals; performing Doppler filtering in a pulse dimension on all pulse echoes of each sub-beam by using a Doppler channel synthesis method of sub-Doppler channels to synthesize a plurality of sub-Doppler channel signals; arranging the obtained sub-beam-sub-Doppler channel two-dimensional data into a column of vectors; estimating a sample covariance matrix by using the sorted reference signal of the sub-beam-sub-Doppler domain; calculating a steering vector of the sub-beam-sub-Doppler domain, and generating a weight coefficient of the STAP of the sub-beam-sub-Doppler domain; and carrying out filtering processing on the sub-beam