纬度未知条件下捷联惯导系统初始对准分析

在捷联惯导系统静基座初始对准的传统方法中,一般要求准确知道当地的地理纬度,如果给定的纬度存在误差,将可能影响初始对准精度。在静基座条件下并且地理纬度未知时,研究捷联惯导系统的初始对准实现问题,并对初始对准精度作详细分析。研究结果表明,在静基座条件下,借助于捷联惯组中的陀螺和加速度计的测量值可以估计出对准点处的地理纬度,再利用估计纬度进行初始对准,如果选择初始对准算法适当,纬度估计误差将不会影响对准精度。

SINS Initial Alignment Analysis Under Geographic Latitude Uncertainty

Suppose to be on a stationary base,a local geographic latitude is demanded in initial alignment algorithm of the classic strapdown inertial navigation system(SINS).A geographic latitude input error will affect the accuracy of initial alignment.On a stationary base and with the geographic latitude uncertainty,SINS initial alignment algorithm is studied,and the alignment accuracy is also analyzed.The research shows that the geographic latitude can be well estimated via gyro and accelerometer measurements.Using the proposed initial alignment method in this paper,the alignment accuracy is insensitive to the approximation of geographic latitude.