In order to more accurately extract desired signals, it is necessary to suppress interference such as reflection and clutter more strictly. This paper discusses a method of suppressing sidelobes adaptively by placing a receive-only array around a high-gain array. The output power minimization method (DCMP) has been proposed as an adaptive clutter suppression method. When this method is applied to a high-gain array, there is a danger of destroying the directivity of the high-gain array. In this paper, a constraint on the weight not destroying the receiving pattern of the high-gain array is added to the DCMP, resulting in a norm-constrained DCMP (DCMP-CN). By using this method, adaptive sidelobe suppression is possible regardless of the intensity of the input signals. (C) 2003 Wiley Periodicals, Inc.