Compared to the conventional plane electromagnetic wave,vortex electromagnetic wave has some unique characteristics such as rational phase front,circular beampattern,and orbital angular momentum information.Benefit from these special characteristics,vortex electromagnetic wave is widely concerned in recent years for applications on target motion parameter estimation.The target Doppler effect of vortex electromagnetic wave is composed by two parts including the linear Doppler shift and the rotational Doppler shift.Current parameter estimation method achieves measurement of the target rotation parameters under the case that the target moving plane is parallel to the antenna port surface.However,under oblique motion plane,current method is no longer suitable.In this paper,a rotation parameter estimation method under oblique motion plane case is proposed based on the rotational Doppler shift of vortex electromagnetic wave.The Doppler signal model of rotational target in general form is derived.By analyzing the Doppler information,the expression of target motion parameters is built.Then,the calculation method of rotation parameters under oblique incidence is proposed.Finally,according to the simulation analysis,the effectivity of the proposed method is verified.
维普
万方数据