摘要
本文提出了将线性调频连续波(LFMCW)雷达差拍信号离散频谱增采样内插以提高雷达测距精度的方法。仿真结果表明,这种方法可以有效降低FFT固有频域采样间隔带来的测距误差,能够在整个频域轴上更准确地反映多个不同距离目标的差拍信号频谱特性,克服Chirp-Z和Zoom-FFT等方法只能在频率轴上局部细化的局限性,其运算量比相同频域采样间隔的补零FFT频谱细化方法大大降低。
In order to improve the range precision of LFMCW radar, this paper presents the method based on the frequency domain up - sampling - interpolating of the beat signal spectrum. The simulation result indicates that this method can effectively decrease the ranging error caused by inherent frequency domain sampling spacing of FFT, and also can reflect the beat signal spectrum characteristic of multiple different range targets in the whole frequency domain accurately, and can overcome the limitation of the Chirp - Z or Zoom - FFT method which can only be used in local thinning in frequency domain. Furthermore, the amount of operation of this method can be decreased considerably comparing with the corresponding padding zeros FFT.
出处
《电讯技术》
2005年第5期77-80,共4页
Telecommunication Engineering
基金
国防预研基金资助项目(41307040403)
教育部跨世纪优秀人才培养计划基金资助项目(B13010201KSJ0202)
