温控和温补相结合的高精度激光惯性导航系统  

High precise LINS based on temperature control combined with temperature compensation

作　　者：李汉舟[1] 潘泉[1] 王小旭[1] 卫育新 邓麟 

机构地区：[1]西北工业大学自动化学院,西安710072 [2]航天科技集团第16研究所,西安710100

出　　处：《中国惯性技术学报》2013年第5期585-590,共6页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金(61075029);国家自然科学基金重点项目(61135001)

摘　　要：环境温度的变化会引起激光惯性导航系统(LINS)精度下降,提出了一种温度控制与温度补偿相结合的新方法:一方面,对加速度计实施温度控制,同时采用两种材料制成隔热垫,阻止加速度计热量外泄对陀螺造成影响,并在此基础上建立加速度计温度特性传递函数;另一方面,采用分段最小二乘拟合和径向基神经网络拟合的方法,建立了激光陀螺全温段零位逐步线性回归模型和径向基神经网络模型,对激光陀螺进行温度补偿。试验结果表明:在-40℃^+60℃大温度范围内,新方法仅需15 min的预热时间,远小于传统单独温度控制方法预热时间,仅使用单轴温控转台就可以完成LINS温度补偿,降低了温度补偿方案后期维护设备费用,其初始对准精度达到理论精度极限。The laser inertial navigation system (LINS) precision is impacted by ambient temperature. A new method combining the merits of temperature control and temperature compensation is presented. The temperature control technology is applied to the accelerometers, and two kinds of material pads are used to prevent the thermal energy of accelerometers from transmitting to laser gyro. The temperature control model of accelerometer is established by the experiments. The RBF artificial neural network and the least square method are used to found the laser gyro bias temperature compensation model. The experiments show that the new method could decrease the preheat time to 15 min, and it is much less than typical preheat time of common LINS with temperature control. Simultaneously, the new method only needs a one-axis table with temperature control box to complete INS temperature compensation. Through accelerometers temperature control and gyro temperature compensation, the azimuth alignment precision of LINS can achieve to the theoretical limitation, while the operating temperature range can be from -40°C to 60°C.

关 键 词：惯性导航系统 激光陀螺 温度控制 温度补偿 初始对准 神经网络 

分 类 号：U666.1[交通运输工程—船舶及航道工程]