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目标与雷达存在相对径向运动时回波相位一次项发生变化,产生多普勒效应。多普勒效应广泛用于雷达信号处理。目标横向运动分量不会导致回波相位一次项变化,但会导致回波相位高次项的变化,据此本文提出横向运动物体的高阶多普勒效应及其横向速度的计算方法。高阶多普勒效应与常规多普勒效应配合可以计算任意向平稳运动物体的标量速度。文中给出了计算方法和仿真结果。当目标横向运动速度为900km/h,且回波信号信噪比大于0dB时,计算误差小于0.06%。
When there is a relative radial movement between the target and the radar, the phase of the echo changes once and the Doppler effect occurs. Doppler effect is widely used in radar signal processing. The target lateral motion component does not lead to a change of the echo phase but a high-order change of the echo phase. Therefore, a high-order Doppler effect and calculation method of the lateral velocity of the lateral moving object are proposed. The high-order Doppler effect and the conventional Doppler effect can be used to calculate the scalar velocity of an arbitrary stationary object. The paper gives the calculation method and simulation results. When the target lateral motion speed is 900km / h, and the signal-to-noise ratio of the echo signal is greater than 0dB, the calculation error is less than 0.06%.