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提出将激光多普勒测速仪(LDV)应用于车载惯性导航系统提供速度参数。阐述了激光多普勒测量自身速度的基本原理,设计了参考光束型LDV,并运用跟踪滤波、频谱细化及频谱校正技术对多普勒信号进行处理。理论分析与实验表明,参考光束型LDV解决了双光束不能进行离焦测量的难题;跟踪滤波器实时跟踪多普勒信号,去除基底信号和部分噪声,提高了信噪比;频谱细化和频谱校正技术,提高了频谱分辨率,使提取的多普勒频率更接近于真实值,减小了系统的测量误差。LDV可以为车载惯导系统提供有效的速度信息。
It is proposed that laser Doppler velocimetry (LDV) be used in vehicle inertial navigation system to provide speed parameters. The basic principle of laser Doppler velocity measurement is described. The reference beam type LDV is designed, and the Doppler signal is processed by tracking filtering, spectral refinement and spectrum correction. The theoretical analysis and experiments show that the reference beam LDV solves the problem that the dual beam can not perform the defocus measurement. The tracking filter tracks the Doppler signal in real time to remove the base signal and part of the noise and improve the signal to noise ratio. The spectral refinement and spectrum Correction technology to improve the spectral resolution, the extracted Doppler frequency closer to the true value, reducing the measurement error of the system. The LDV provides efficient speed information for in-vehicle navigation systems.