In the ground short range slowly moving target detection of airborne fire-control radar

the two dimensional clutter spectrum varies with range due to the variation of elevation angle and shows high non-homogeneity.In this case

good detective performance can not be obtained by using either conventional or STAP processing method.In this paper

a compensating method of clutter spectrum is proposed.Transforming data of different range ring with different frequency-shift

it can weaken the non-homogeneity effectively and locate the clutter energy center in a very small area of two dimensional plane.The computer simulation results show good performance and high improvement factor can be obtained when it is used as the pre-processor of STAP and it has the advantages of low complexity and ease of application.