高精度车载航位推算温度补偿研究  

Research on temperature compensation of high precision vehicular dead reckoning system

作　　者：贾继超[1] 李岁劳[1] 赵成志[1] 颜开思[1] 

机构地区：[1]西北工业大学自动化学院,西安710129

出　　处：《仪器仪表学报》2010年第10期2198-2202,共5页Chinese Journal of Scientific Instrument

摘　　要：温度变化会导致轮胎半径变化,对由里程仪作为测程元件的轮式车辆而言,温度变化会引起里程仪的刻度系数变化,需要建立里程仪刻度系数的温度模型来提高里程仪的测距精度。基于Hadekel轮胎下沉量近似计算公式和胎内气体热力学分析,建立轮胎下沉量及轮胎有效半径的温度模型,进而建立里程仪刻度系数的温度及纵坡度模型,利用最小二乘法标定模型系数,进行跑车试验验证模型补偿效果,跑车试验结果表明:里程仪刻度系数经过温度及纵坡度补偿,里程仪测距精度由1.83‰提高到0.13‰,精度提高一个量级,该模型可使里程仪实现高精度测距。Temperature change can cause tire radius change. If odometer is used as the range measurement element of wheeled vehicles, temperature change can lead to odometer calibration coefficient change. In order to improve range measurement accuracy, a temperature model of odometer calibration coefficient needs to be established. Based on the tire deflection approximate formula proposed by Hadekel and thermodynamic analysis of gas inside the tire, the temperature models of tire deflection and effective radius are established, and then the temperature and longitudinal gradient models of odometer calibration coefficient are also proposed. Least squares fitting of the model coefficients is performed. To verify the model compensation effect, vehicle navigation experiments were carried out. Experiment results show that the range measurement relative accuracy of the odometer is improved to 0.13‰ from 1.83‰ through temperature compensation and longitudinal gradient compensation. The measurement accuracy of odometer is raised one order of magnitude. This model can make odometer realize high precision range measurement.

关 键 词：轮胎下沉量 温度补偿 里程仪 纵坡度 轮胎有效半径 刻度系数 

分 类 号：V249.3[航空宇航科学与技术—飞行器设计]