大时宽带宽积雷达空间目标距离像估计

摘要

A technique based on quadratic phase filters is proposed to obtain the radial velocity and accel-eration of the space target using signals with large time-bandwidth product.The range profile can be got after the corresponding motion compensation using the estimated parameters.First,the echo model is deduced for the targets,and the mathematical expression is yielded after the pulse compression processing to attain the requirement which is not suitable for the normal pulse compression.Then,this algorithm is employed to esti-mate the radial velocity and acceleration of the space target.In order to yield the target’s range profile,the quadratic-cube phase coefficient and range-Doppler coupling are compensated with the estimated parameters. The simulation results demonstrate the feasibility of refining the space target’s range profile.%采用二次相位滤波的方法，估计大时宽带宽积信号下空间目标的速度及加速度，并进行相应的运动补偿后获得目标一维距离像。首先，推导出具有大时宽带宽积信号的空间目标回波模型，分析了利用传统脉压处理后的数学表达式，给出不适合传统脉压处理的条件。为此，利用该方法得出速度和加速度估计值并进行二次和三次相位项系数及距离多普勒耦合的补偿，以获得目标距离像。仿真实验验证了该条件下提取空间目标一维距离像的可行性。