适用于捷联惯导温度补偿的高精度测温系统

针对捷联惯导温度补偿的研究,设计了一种用铂电阻Pt1000作温度敏感器, ADS1148为信号调理和A/D转换的高精度双通道数字测温系统。采用高性能集成芯片、双恒流源式三线式配线法、比例输出结构和RC低通滤波器的设计,有效的简化了电路,增加了系统的抗干扰能力并减小了硬件误差；主控芯片采用MSP430单片机实现与ADS1148的通信和对上位机输出与温度数据相对应的16位数字量。试验结果表明该系统在捷联惯导温度补偿研究中所用的-40°C到60°C的温度范围内达到了0.002°C的分辨率。

High precision Temperature Measurement System for the SINS Temperature Compensation Study

A design of high precision and dual channel digital temperature measurement system is proposed according to the research on the strapdown inertial navigation system(SINS) temperature compensation method, which is triggered by a platinum resistance temperature detector(RTD) Pt1000 as temperature sensor and regulated by ADS1148 for the signal conditioning and A/D conversion. The circuit is simplified effectively and increases the anti-inference ability of the system and reduces the hardware error by the design of high performance integrated chip, double constant current source three-wire RTD circuit, the proportion of output configuration and RC low-pass filter; MSP430 is performed as a host controller to realize the communication with ADS1148 and having 16 bits digital output to the computer corresponding with the vary temperature data. The results with the experimental data indicates that the measurement resolution of 0.002°C is attained from -40°C to 60°C of measurement range on the research of SINS temperature compensation.