摘要
建立了飞机目标的三维几何模型和离散冲激响应模型,给出了步进频率雷达多散射中心目标的回波数学模型,推导了其相参合成一维距离像原理。为补偿目标因径向速度对合成距离像峰值时移和能量发散,提出了一种适合工程应用的速度补偿方法。该方法在最小脉组相位差分法之前先使用互相关函数FFT方法对目标速度进行粗估计,确定了速度估计范围后再以最小脉组相位差分为准则搜索精确速度,从而大大减小了搜索工作量,有利于实时处理。仿真实验表明,该方法具有抗噪性能好、估计精度高等优点。
In the paper, the three dimensional model of plane and the discrete impulse response model are established. The math model of echo signal from a target of multiple scatters for the stepped-frequency radar is presented and the principle of synthesizing a HRRP by phase coherent integration is derived. Because of the shift of peak and divergence of energy, a velocity compensation method suitable for engineering applications is proposed. This method is to use cross correlation function FFT to estimate the target velocity roughly before using the least burst phase error rule. When the velocity range has been known, the least burst phase error rule is used to seach for the precise velocity value. The searching workload is decreased greatly, which is convenient for real time processing. The computer simulation indicates that the new method has advantages of anti-noise and high precision.
出处
《雷达科学与技术》
2009年第4期267-271,共5页
Radar Science and Technology
关键词
步进频率
散射中心模型
距离像
速度补偿
stepped frequency
scatter center model
range profile
velocity compensation
