针对空间快响相机多通道、宽测温范围的温度数据快速精确采集要求, 分析了温度数据采集电路中NTC热敏电阻的非线性特性, 总结了热敏电阻非线性传感特性的补偿方法, 并以航天热控设计中MF501型NTC热敏电阻为例, 提出一种在卡尔曼滤波方法下的基于电压-温度采集数据的有理式回归模型, 并通过Matlab编程运算, 对一类基于电压-温度数据的回归模型进行仿真分析与性能参数对比。实验表明: 在-10~+50 ℃温度范围内, 应用最优回归模型补偿后的温度采集精度为0.134 0 ℃, 内存占用量为56字节, 综合性能优于传统的数据采集处理方法, 通用性强、使用方便, 可以在保证低资源占用量的条件下有效提高温度数据的采集精度和测量范围。

In view of multi-channel, wide temperature range of temperature data acquisition requirements of space camera, analysis is made to the nonlinear characteristic of the NTC thermistor in temperature acquisition circuit, and the method for compensation of nonlinear thermistor sensing property is presented.Taking MF501 NTC-thermistor in design of aerospace thermal control as an example, a new kind of rational regression model of voltage-temperature data is proposed based on Kalman filtering, and simulation analysis is made to which performance parameters by Matlab programming.The experimental results show that:1) In temperature range of -10~+50 ℃, the temperature measurement accuracy by using the rational regression model is 0.134 0 ℃, the memory usage is 56 bytes, and its comprehensive performance is better than that of the traditional data acquisition and processing method;and 2) The method has strong commonality and is convenient for application, which can improve the acquisition accuracy and measurement range of the temperature data effectively with low resource consumption.