重力误差对空间稳定型机载惯导系统(spacestabilizedinertialnavigationsystem,SSINS)的3个通道都存在影响,特征根分析表明重力误差会造成SSINS的导航参数呈指数发散。为克服由重力误差引起的系统发散,采用飞行器上测高设备测量的高度值进行重力计算补偿,并从原理上证明了该种重力计算补偿方法的可行性和正确性。最后对理论分析进行了仿真验证,结果表明引入外测高度信息计算重力可以有效的抑制重力误差造成的系统发散,并且该补偿方法不破坏SSINS的舒勒调整条件。

Gravity error influences three channels of airborne space stabilized inertial navigation system (SSINS). Gravity makes SSINS exponentially diverge. To overcome the divergence caused by the gravity, the altitude measured by aircraft altimeter device was used to calculate gravity compensation. The gravity calculation compensation method is feasible and correct. Finally, the theoretical analysis was validated by simulation. Results show that the introduction of external altitude information to calculate the gravity can effectively suppress the system divergence caused by gravity, and this gravity compensation method does not destroy the Schuler adjustment conditions of SSINS.