基于非线性函数多项式拟合的激光侦听器波长偏移校正  

Wavelength Offset Correction of Laser Interceptor Based on Non-Linear Function Polynomial Fitting

作　　者：郭晓春[1] 曹萍萍[1] Guo Xiaochun;Cao Pingping(Department of Basic Teaching and Research,Criminal Investigation Police University of China,Shenyang 110854,Liaoning,China)

机构地区：[1]中国刑事警察学院基础教研部,辽宁沈阳110854

出　　处：《应用激光》2024年第9期147-153,共7页Applied Laser

基　　金：公安部技术研究计划基科费项目(2021JSYJC23);公安部公安理论及软科学研究计划项目(2022LL62);辽宁省教育厅科学研究经费项目(LJKZ0075);中央高校基本科研业务费重大项目培育计划(D2021009)。

摘　　要：激光侦听器的发射波长在远距离监听过程中,存在非线性偏移问题,导致接收到拍频信号波长与实际拍频信号波长存在较大的位移偏差。提出一种基于非线性函数多项式拟合的激光侦听器波长偏移校正方法。通过对激光侦听器波长的非线性估计,明确拍频信号存在的偏移,利用改进多项式拟合建立非线性校准函数模型。采用功率加权得出各透射波的中心波长,根据中心波与电压变化关系得出实际拍频频率,运用希尔伯特变换计算瞬时拍频的频率,二者间差值即为拍频偏移量。矫正偏移量完成激光侦听器波长非线性校准。实验结果表明,所提校准方法有效降低了激光侦听器接收波长的均方误差数值,校准后波长与目标对象实际波长基本一致,准确实现了激光侦听器波长偏移校正,提升了激光侦听器的准确度。In the process of remote monitoring,the emission wavelength of the laser listener has a nonlinear shift problem,which results in a large displacement deviation between the received beat signal wavelength and the actual beat signal wavelength.A wavelength offset correction method of laser interceptor based on nonlinear function polynomial fitting is proposed.Through the nonlinear estimation of the laser listener wavelength,the offset of the beat frequency signal is identified,and the nonlinear calibration function model is established by using improved polynomial fitting.The center wavelength of each transmitted wave is obtained by power weighting,the actual beat frequency is obtained according to the relationship between the center wave and the voltage change,and the instantaneous beat frequency is calculated by Hilbert transform.The difference between the two is the beat frequency offset.Correct the offset to complete the wavelength nonlinear calibration of the laser listener.The experimental results show that the proposed calibration method effectively reduces the mean square error value of the received wavelength of the laser listener,and the calibrated wavelength is basically consistent with the actual wavelength of the target object,which accurately realizes the wavelength offset correction of the laser listener and improves the accuracy of the laser listener.

关 键 词：改进多项式拟合 激光侦听器 非线性校准 中心波长 拍频信号 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TN248[自动化与计算机技术—计算机科学与技术]