High-precision rate offset frequency inertial measurement unit acceleration channel random noise estimation method and system

The invention discloses a high-precision rate offset frequency inertial measurement unit acceleration channel random noise estimation method and system. Random noise of the acceleration channel of the high-precision rate offset frequency inertial measurement unit is estimated according to the following formula: k=-1, -0.5, 0tau=1-30 s; k=-0.5, 0, 0.5tau=10-80 s; k=0, 0.5, 1tau=50-2900 s; sigma1(tau), sigma2(tau) and sigma3(tau) are random noises corresponding to different time periods tau; and Ak is the coefficient of the noise term. The random noise item coefficient of the acceleration channel of the high-precision rate offset frequency inertial measurement unit is estimated by using a multi-overlapping piecewise Allan standard deviation method, and the estimation result is more accurate. 本发明公开了一种高精度速率偏频惯组加速度通道的随机噪声估计方法及系统，利用以下公式估计高精度双轴速率偏频惯组加速度通道的随机噪声：k＝-1,-0.5,0τ＝1～30s；k＝-0.5,0,0.5τ＝10～80s；k＝0,0.5,1τ＝50～2900s；其中，σ1(τ)、σ2(τ)、σ3(τ)为不同时间段τ对应的随机噪声；Ak为噪声项的系数。本发明利用多重叠分段Allan标准差法估计高精度速率偏频惯组加速度通道的随机噪声项系数，估计结果更加准确。