本文讨论了不同测速系统中速度误差和振荡器频率稳定度的关系。由测速系统的传递函数对振荡器随机相位功率谱密度的抑制作用,得到了测速终端输入端Doppler信号的随机相位功率谱密度公式。文中还给出了速度采样方差,以及用最小二乘法平滑出速度的误差协方差矩阵与频率稳定度之间的关系。 This paper discusses the relationship between speed error and oscillator frequency stability in different speed measurement systems. The formula of random phase power spectral density of the Doppler signal at the input terminal of speed measurement is obtained from the inhibition of the power spectral density of the oscillator by the transfer function of the speed measurement system. The paper also gives the relationship between the speed sampling variance and the error covariance matrix and the frequency stability by using the least square method to smooth out the velocity.