摘要
在雷达多脉冲相参积累过程中,高速机动目标的速度模型可建模为三次相位信号,其中,调频率和二次调频率是引起多普勒频移的因素。如何快速估计调频率和二次调频率对雷达多脉冲相参积累至关重要。针对传统算法在三次相位信号参数估计中存在低计算复杂度与高抗噪声性能矛盾的问题,本文提出一种基于非均匀傅立叶变换的三次相位信号参数估计方法。首先,基于非均匀傅立叶变换对HAF-ICPF方法进行改进;然后,利用改进的HAF-ICPF方法估计三次相位信号的参数。改进的HAF-ICPF方法由于避免了复杂的搜索过程,在保持原有高抗噪声性能的基础上,大大降低了计算复杂度。仿真结果验证了方法的有效性。
The conventional algorithms for parameter estimation of the cubic phase signal cannot achieve a trade-off between the low computational cost and high anti-noise performance. Considering the question, a novel method based on the nonuniform fast Fourier transform（NUFFT） is proposed to estimate parameters of multi-component cubic phase signal. Firstly, the improved HAF-ICPF method based on NUFFT is introduced. Then, the improved HAF-ICPF method is utilized to finish the quadratic chirp rate estimation of multi-component cubic phase signal. The proposed method has low computational complexity due to avoiding the matching process of searching and still has same performance with the HAF-ICPF method. Simulations verify the effectiveness of the method.
作者
宋凯
朱文涛
SONG Kai;ZHU Wentao
出处
《现代导航》
2018年第3期216-219,共4页
Modern Navigation
关键词
参数估计
三次相位信号
非均匀傅立叶变换
Parameter Estimation
Cubic Phase Signal
Nonuniform Fast Fourier Transform
