A method for determining errors in measuring systems

Translated from Izmeritel'naya Tekhnika, No. 11, pp. 27–28, November, 1992.     

The problem of analyzing errors in measuring systems

Summary In the operation of a linear measuring system with its elements subjected to various random external disturbances which produce in the elements additional static errors, transmitted to the output of the system together with the basic errors of the elements, a total static error is produced at the output. The latter error is the one which determines the accuracy of the measuring system under given conditions.If in experimental work the required variable is measured several times by means of a measuring system, whose elements are subjected to various random external disturbances, a statistical analysis of the measurement results may produce a certain compensation of the static measurement errors of this variable.     

Accurate self-synchronizing technique for measuring transmitterphase and frequency errors in TDMA digitally encoded cellular systems

Measurement of phase and frequency errors, affecting the transmitted signal in digitally encoded cellular systems, is discussed here. To this aim, a new, cost-effective technique, particularly suitable in time domain multiple access (TDMA) systems, is proposed. In contrast to other measurement methods or instruments, the proposed technique gains burst synchronization on the analyzed signal through digital signal-processing, thus avoiding the need of sophisticated and expensive analog triggering solutions. Only a general-purpose data acquisition system is, in fact, required to capture a proper time window of the transmitted signal, preliminarily down-converted to intermediate frequency. Furthermore, in the same way as other methods or instruments, phase and frequency errors are evaluated according to a standard digital signal-processing procedure, which applies both for the actual and reference phase trajectory of the transmitted signal. The technique makes both trajectories available just at the end of the aforementioned burst synchronization stage, thus also optimizing the computational burden     

现代测试计量技术及仪器的发展

当今制造技术的快速进步引发了许多新型测试计量问题,推动着传感器、测试计量仪器的研究与发展,促使测试计量技术中的新原理、新技术、新装置系统不断出现.和传统的技术比较,现代测试计量技术呈现出测量仪器的作用愈加重要,新的仪器不断出现,如便携式形貌测量、基于视觉的在线检测、基于机器人的在线检测与监控、微,纳米级测量和虚拟测试技术等.除此,仪器设备的精确度有了质的飞跃,自动化程度得到显著改善,同时在计算机软、硬件的支持下,其功能得到极大拓展,展现出一片欣欣向荣的景象.当务之急,是针对测试计量技术应用特点,分析我国的现状,比较与国外同类技术存在的差距,探讨在目前条件下我国测试计量技术的发展重点和趋势.在未来的测试计量技术及仪器技术的发展中,针对实际存在的问题和发展趋势,着力加大科研投入,重视基础研究,紧密联系工程应用.相信在不久的将来,我国测试计量技术定可获得快速的发展,为我国科学技术和国民经济的发展发挥更大的作用.     

Integration of multivariate measurements for the correction of cross multiplicative systematic errors of measuring systems

Optimal estimates of a set of measured values that make it possible to reduce the influence of random and cross multiplicative systematic errors of measuring instruments are discussed.