工业无线微机遥测系统误差原因及精度分析

Error Causes and Precision Analysis for Industrial Computer-Based Telemetery System,

为了使工业无线微机遥测系统获得的数据准确、可靠,系统误差必须在允许的范围内。工业无线微机遥测系统误差主要来自系统取样、编码和信道传送信号过程,详细分析了这三个环节产生误差的具体原因。根据误差理论,将测量误差分为三大类,即系统误差、随机误差和粗大误差。并按如下步骤判定遥测数据是否准确:确定误差的性质;判断所测数据中是否存在系统误差和粗大误差;剔除异常数据——粗大误差。由于微机具有强大的数据处理功能,因此微机遥测系统的精度可大大提高,但必须把握住传感器的选择和信号采集两个关键。

In order to obtain accurate and reliable data, system errors shall be controlled to an allowable limit. The errors in an industrial computer-based telemetery system are created mainly in the causes of systematic sampling, coding and signal transmission. Specific error causes are analysed respectively. Based on the theory, of error, measurement errors are classified into three categories: systematic error, random error and extensive error, and the data precision is determined in the following procedure: (1)classify the category of the errors; (2)decide whether systematic or extensive errors exist in the data measured; and (3)reject the abnormal data (extensive error), if any. Because computers are powerful in data processing, computer-based telemetery system can be greatly improved in terms of its precision provided sensors are duly selected and signals correctly acquired.