【摘 要】
:
对于高分辨率雷达来说,空间目标的高速运动会使de-chirp后的信号中含有相位高次项,要获得目标未展宽的一维距离像必须进行运动补偿。针对空间目标的宽带脉冲回波模型定量分析
【机 构】
:
信息工程大学信息工程学院,61191部队,
论文部分内容阅读
对于高分辨率雷达来说,空间目标的高速运动会使de-chirp后的信号中含有相位高次项,要获得目标未展宽的一维距离像必须进行运动补偿。针对空间目标的宽带脉冲回波模型定量分析了大加速度和高速运动对目标一维距离像的影响,给出了一种同调频斜率多分量信号的调频斜率估计方法,该方法将调频斜率转变为单频,较好地抑制了交叉项的影响,通过傅立叶变换就可以消除空间目标高速运动给成像带来的影响,同时具有较好的抗噪性能。最后通过仿真验证了该算法的有效性。
For high-resolution radar, the high-speed motion of the space object will make the signal after de-chirp contain the high-order phase, and the object must be motion-compensated to obtain the unidirectional one-dimensional distance image. A broadband pulse echo model for spatial target is used to quantitatively analyze the effect of large acceleration and high-speed motion on the target’s one-dimensional distance image. A method for estimating the frequency-modulated slope of multi-component signal with co-frequency slope is proposed. The method converts the frequency- Single-frequency, better suppress the impact of the crossover term, through the Fourier transform can eliminate the impact of high-speed space targets to imaging, and has good noise immunity. Finally, the simulation results show the effectiveness of the algorithm.
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