摘要
惯性系统的精度主要靠陀螺和加速度计的精度来保证。通常,惯性仪表所处的温度环境比较恶劣,虽然内部空间有二级温控来保证仪表有良好的工作环境,但惯性传感器还是对内部空间温度梯度变化有很高的敏感度,从而影响了系统精度。提出了空间分区域测温方案,将空间温度点划分为若干区域,在单个区域内确定若干个温度点作为一个采集终端站点,经过站点式测温后将数据分时发送到主接收站点。在温度采集过程中,铂电阻存在的非线性、自热效应会影响测温精度。采用阻值比较法,通过引入恒定激励电流,可以抑制温度采集电路的自热效应。无线传输采用蓝牙Mesh组网来实现传感器数据的传输,从各个末梢传感器节点采集的温度数据经过无线模块发送到网关节点,网关节点将采集到的数据传给上位机。测试结果表明:该系统可实现多通道温度采集,在一定范围内,测温精度能达到±0.05℃,满足精度攻关要求。
The accuracy of the inertial platform system is mainly ensured by gyroscope and accelerator installed inside the platform. Generally, the temperature inside is precarious. Although the second-level temperature control could ensure a good working environment which inertial instrument is needed, the inertial sensor is still sensitive to the space temperature gradient which affects the system accuracy. The spatial sub-area temperature measurement scheme is proposed in this paper. The space is divided into several areas, each temperature point is collected as a terminal station. After the station temperature measurement, the data of the spatial temperature is continuously sent to the central receiving station. During the temperature sampling process, the sensor has nonlinearity and self-heating effect which has affected on the measurement accuracy. The self-heating effect of the temperature sampling circuit could be restrained by using the resistance comparison method and introducing the constant excitation current. The wireless data transmission is accomplished by bluetooth Mesh network. The temperature data collected from each peripheral sensor nodes is transmitted to the gateway node through wireless module. Finally, the central computer will receive the sensor data. The test results show that the multi-channel temperature sampling is achieved within a certain range. The temperature measurement accuracy could reach ±0.05℃, which meets the accuracy requirement.
作者
马一通
闫文民
翟庆辉
MA Yi-tong;YAN Wen-min;ZHAI Qing-hui(Laboratory of Science and Technology on Ultra-precision Aerospace Control Instrument,Beijing 100039;Beijing Institute of Aerospace Control Devices,Beijing 100039)
出处
《导航与控制》
2021年第1期109-116,共8页
Navigation and Control
关键词
惯性系统
温度采集
蓝牙Mesh
inertial system
temperature sampling
bluetooth Mesh network
