基于调频傅里叶变换的改进型鉴相测速

吴佳宁; 葛俊祥; 杨帆

引用本文:	吴佳宁，葛俊祥，杨帆. 基于调频傅里叶变换的改进型鉴相测速[J]. 雷达科学与技术, 2022, 20(4): 457-463.[点击复制]
	WU Jianing, GE Junxiang, YANG Fan. An Improved Phase-Derived Velocity Measurement Method Based on Chirp-Fourier Transform[J]. Radar Science and Technology, 2022, 20(4): 457-463.[点击复制]

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基于调频傅里叶变换的改进型鉴相测速
吴佳宁，葛俊祥，杨帆
南京信息工程大学电子信息技术与装备研究院，江苏南京 210044

摘要:

随着机动目标的高速化、小型化发展，对于雷达的测量精度也提出了更高的要求。鉴相测速能够达到波长级的测量精度，其技术难点主要包括相位提取和解相位模糊。为了降低鉴相测速对信噪比的要求，本文提出了一种基于调频傅里叶变换的改进型鉴相测速方法。首先建立变脉冲重复周期的回波模型，对回波信号进行互相关FFT处理，提取峰值点得到模糊相位；其次对互相关FFT结果进行调频傅里叶变换，得到速度和加速度的粗估计值；然后根据单帧解相位模糊法，对模糊数修正值进行遍历，找出最优解，得到优化后的解模糊相位；最后采用鉴相测速，得到速度的精确值。仿真实验证明了该方法的可行性和有效性。

关键词: 鉴相测速调频傅里叶变换变脉冲重复周期低信噪比

DOI：DOI:10.3969/j.issn.1672-2337.2022.04.015

分类号:TN957.51

基金项目:国家自然科学基金（No.61671249）

An Improved Phase-Derived Velocity Measurement Method Based on Chirp-Fourier Transform

WU Jianing, GE Junxiang, YANG Fan

Institute of Electronic Information Technology and Equipment, Nanjing University of Information Science and Technology, Nanjing 210044, China

Abstract:

With the development of maneuvering targets toward high speed and miniaturization, higher requirements are put forward for the measurement accuracy of radar. Phase-derived velocity measurement can achievewavelength level measurement accuracy, but there are two difficulties in extracting the echo phase and resolving the phase ambiguity. In order to reduce the requirement of signal-to-noise ratio for phase-derived velocity measurement, an improved phase-derived velocity measurement method based on chirp-Fourier transform is proposed. Firstly, an echo model with variable pulse repetition period is established and the echo signal is processed by cross-correlation FFT. The fuzzy phase is obtained by extracting the peak point. Secondly, the chirp-Fourier transform of cross-correlation FFT results is carried out to obtain the rough estimates of velocity and acceleration. According to the single-frame phase solution fuzzy method, the modified value of the fuzzy number is traversedto find the optimal solution, and the optimized phase is obtained. Finally, the accurate velocity is obtained by using phase-derived velocity measurement. The feasibility and effectiveness of the proposed method are proved by simulation experiments.

Key words: phase-derived velocity measurement chirp-Fourier transform variable pulse repetition period low signal-to-noise ratio