A new radar detection method based on some obtained decision information is proposed in this paper.The decision information

which can be roughly considered as a priori knowledge about the target

can be utilized to modify the current decision rules of the system.Such modification can improve the detection performance of the system.Additionally

we make an analysis on the expression of the likelihood ratio

present the approach to determine the decision threshold

and evaluate the detection performance of the system.The computer simulation experiments verify the feasibility of the proposed detection method.