摘要
太赫兹雷达的波长短且带宽大,与微波、毫米波相比,易于实现很高的测距精度。采用调频连续波雷达测距,在差频信号进行频谱分析过程中,频谱泄露和栅栏效应影响其测距精度。该算法通过调整采样参数实现整周期采样,减少频谱泄露,通过峰值谱线和相邻谱线构成的梯度法估计频谱峰值中心频率,减小离散频谱间隔造成的误差,通过两步的校正提高测距精度。实验结果表明:该算法的测量精度误差与传统频率估计法相比有所降低,与直接采用FFT的方法平均提高了58.5%。
Compared with microwave and millimeter-wave, Terahertz radar is easy to realize high distance measurement precision due to short wavelength and wide bandwidth. It adopts frequency modulated continuous wave radar, in the process of spectral analysis of beat signal, the spectrum leakage and fence effect have impact on distance measurement precision. By adjusting sampling parameter to realize integral period sampling reduce spectrum leakage, and central frequency of peak spectral frequency is estimated by the gradient method which is made up of peak spectral line and adjacent spectral lines, reduces error caused by discrete spectrum interval. The precision is improved by two steps correction. Experimental results indicate that error of measurement precision of proposed algorithm is reduced compared with traditional frequency estimation method, precision of proposed method is increased by an average of 58.5 % compared with FFT.
出处
《传感器与微系统》
CSCD
2016年第9期141-143,151,共4页
Transducer and Microsystem Technologies
基金
国家高技术研究发展计划("863"计划)资助项目(2012AA012705)
天津市国家国际科技合作专项项目(14RCGFGX00845)
关键词
太赫兹雷达
测距精度
频谱分析
整周期采样
梯度法
terahertz radar
distance measurement precision
spectral analysis
integral period sampling
gradient method
