摘要
针对频率步进信号中存在的距离-多普勒耦合现象,提出了一种利用频率步进信号的回波多普勒频差来进行目标速度估计方法。具体的算法是求出相邻两帧相对应的距离单元的数据相位差,该相位差与时间呈正比关系,是邻帧回波多普勒差在时域的体现。通过相位解卷绕和数值拟合的方法求解相位差的斜率,该斜率即为回波多普勒频差,利用回波多普勒频差与目标运动速度成正比的关系估计出目标运动速度。通过仿真试验分析了该算法的测速范围、测速精度和抗噪声性能。
Proposes a new method to resolve the problem of range-Doppler coupling on stepped-frequency signal processing,which deals with the velocity estimating based on the Doppler frequency difference of target echo.The main idea is to solve the phase difference of the same range cells of two adjacent frames,which is the representation of Doppler frequency difference in time domain and in direct proportion to time.Through line fitting and phase-unwrapping,the slope of the phase difference can be solved,which is the difference of Doppler frequency of target echo and in direct proportion to the velocity of the target.Therefore,the velocity of the target could be estimated by the difference of Doppler frequency.The simulate resuls show the characteristics of this method such as measure range of speed,measurement precision and anti-noise performance.
作者
谭姗姗
江利中
田原
汤振华
TAN Shan-shan;JIANG Li-zhong;TIAN Yuan;TNAG Zhen-hua(Shanghai Radio Equipment Research Institute, Shanghai 200090, Chin)
出处
《制导与引信》
2017年第3期23-28,共6页
Guidance & Fuze
关键词
频率步进信号
速度估计
相位解卷绕
stepped-frequency signal
velocity estimation
line fitting
