An Estimation of Low-Elevation Target DOA in Phased Array Radar

It is very effective that applying frequency agility to reduce the coherence of the direct and the reflect signal in phased array radar, which are contained in the echo of radar. This method can restrain the influence caused by multipath effect when estimating the target's direction of arrival (DOA), and improve the precision and ability of angle's estimation. Then the application of the modified AR model can not only reduce the coherence of the two signals further, but separate the elevations of the target and its image. The simulation results verify the validity of the theory of frequency agility and modified AR model, as well as the advantage and practicability with the combination of two methods when comparing with other methods.