Effects on sum and difference patterns by adaptive null

This paper presents a simple method of forming sum and difference patterns with adaptive nulls. The effects on the sidelobe level and the pointing null of difference pattern by adaptive null are analyzed. The result that the increment value of the envelope of the sidelobe level under the effect of a null is less than 1.6dB is proved. The formula about shift value of the pointing null which is the function of the jammer direction and array parameters is given in the paper.