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This paper proposed a monopulse method using multiple frequencies to overcome multipath interference in the tracking of low-altitude sea targets. The method determines target elevation candidates by comparing the difference between the measured complex monop- ulse ratios and those calculated considering multipath interference at three adjacent frequencies. The final target elevation is determined among the candidates by using a cost function set based on the characteristics of the results considering multipath interference. Because the proposed method requires solely the measured target distance and monopulse ratios, it can be applied to the existing monopulse radar system without additional configuration. The suppression effect of multipath interference was verified by a simulation conducted for tracking low-altitude targets in a multipath environment. [ABSTRACT FROM AUTHOR]

A method to improve the tracking accuracy of low-altitude sea targets is proposed using an adaptive beamforming algorithm in a multipath environment. It is confirmed that the target elevation can be estimated with relatively high accuracy without repetitive calculation using the proposed method in analog beamforming active electronically scanned array radar. The proposed method improves the tracking accuracy by adding a side-lobe suppression condition to the existing adaptive beamforming constraint for mono pulse inclination control while accounting for the characteristics of the low-altitude sea target with less elevation change. In addition, various adaptive beamforming algorithms were applied to the proposed method, and the results were compared and analyzed to optimize tracking accuracy. [ABSTRACT FROM AUTHOR]