An algorithm based on elevation geometric mean for monopulse radars to track a target at low altitude

Conventional tracking radars are often embarrassed when targets being tracked are flying at low altitude over a flat surface. The basic idea for conventional low-angle tracking techniques is to avert the multipath interference by shielding the antenna from the surface reflection or by eliminating the reflection component from the received signal. This is the most direct way to deal with the well-known multipath effect. A new algorithm using a different idea is presented, with which the signal from the reflecting surface can be used to enhance that directly from the target, resulting in extended accuracy, applicability and efficiency. The estimation of the target elevation angle is expressed as the geometric mean of the target and its image´s angles relative to the boresight axis. Implementation of the algorithm is quite simple