雷达科学与技术2026，Vol.24Issue(3)：258-270,13.DOI:10.3969/j.issn.1672-2337.2026.03.003
基于子载频相干与二次拟合的FMCW雷达高精度测距算法
A High Precision Ranging Algorithm for FMCW Radar Based on Sub-Carrier Frequency Coherence and Quadratic Fitting
摘要
Abstract
When the modulation bandwidth of frequency modulation continuous wave(FMCW)radar is de-creased,the coherent spectrum of the coherent chirp-Z transform(CCZT)ranging algorithm is prone to exhibit dense periodic peaks,making it difficult to accurately locate the true spectral peaks,thereby leading to a reduction in ranging precision.Aiming at this problem,this paper proposes a high precision ranging algorithm that combines sub-carrier fre-quency coherence and quadratic fitting(SFC-QF).The algorithm first performs coherent processing on the beat signals of different sub-carriers,by introducing carrier frequency difference weighting into the coherent spectrum to suppress periodic peaks under low-bandwidth conditions.Then,the estimation results of the coherent spectrum and its neighbor-hood are quadratically fitted to reduce the dependence of the algorithm performance on the number of spectrum refine-ments and achieve higher estimation accuracy.Simulation results demonstrate that,compared with the CCZT and other comparison algorithms,the proposed SFC-QF method can significantly improve the ranging estimation precision in low-bandwidth radars at the hundred-megahertz level,which provides an effective solution for high precision distance measurement of low-bandwidth FMCW radar.关键词
调频连续波雷达/高精度测距/子载频相干/二次拟合/低带宽雷达Key words
FMCW radar/high precision ranging/sub-carrier frequency coherence/quadratic fitting/low-bandwidth radar分类
信息技术与安全科学引用本文复制引用
朱凯,陈奕江,王旭,杨东永,魏国华..基于子载频相干与二次拟合的FMCW雷达高精度测距算法[J].雷达科学与技术,2026,24(3):258-270,13.基金项目
国家重点研发计划(2022YFB3200189) （2022YFB3200189）
北京理工大学特立学生科技创新团队(2025CX06030) （2025CX06030）
