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 and spatial targets with high acceleration and speed, the signal after de-chirp processing will has high-order coefficients in its phase. It needs motion compensation to get accurate range profile. The paper analyzes the impact of high acceleration and maneuvering on range profile in quality and proposes a compensation algorithm aimed at multi-component signals with the same chirp constant. It turns the chirp constant into a single frequency and eliminates the influence of high-order coefficient by FFT without estimating acceleration and velocity. Due to no phase estimation, the algorithm has good anti-noise performance. Finally, simulation results verify the validity of the method.
出处
《信息工程大学学报》
2011年第4期452-457,共6页
Journal of Information Engineering University
基金
科研基金资助项目
