一种新的激光捷联惯导系统级温度补偿方法

激光捷联惯导工作时,惯组内的温度会随着时间不断升高,引起惯性器件标度因数和零偏的变化,从而无法满足惯组在全温范围内工作.因此,有必要采取相应措施来减少温度带来的误差.提出一种通过3次样条插值法建立初始模型,不断迭代计算模型偏差修正样条曲线的方法,确立激光陀螺和石英挠性加速度计的温度误差模型存入DSP 中,最终由导航计算机实现惯组输出的实时补偿.通过标定和静态通电验证了模型的正确性和重复性,为进一步提高惯导精度奠定了基础.

Novel Method of System-level Temperature Error Compensation for Laser Gyro Strapdown Inertial Navigation

In the practical work of inertial navigation,the temperature in IMU will rise with time,which lead to the scale factors and bias make change,it cannot work well in the whole temperature range.So it is necessary to take corre-sponding measures to reduce temperature errors.This paper presents a new method which build initial model by spline in-terpolation and establish the temperature error model of laser gyro and accelerometer in DSP by calculating the deviation of model to correct spline curve,and finally realize real-time compensation by computer.The correctness and repeatability of the obtained temperature model are verified by the compensated INS multiple calibrating and static working,which will lay the foundation for the further improvement of the precision of INS.