<title>Abstract</title> Beamspace domain super-resolution methods for elevation estimation in multipath environment has attracted significant attention. However, the difference beam is rarely used in super-resolution methods, especially in low elevation estimation. In order to improve the accuracy of beamspace domain maximum likelihood algorithm for elevation estimation, we apply the difference beam to the beamformer. Therefore, we develop a sum and difference beamspace domain maximum likelihood (SDBDML) algorithm…