Method of high-precision frequency measurement for signals
Abstract:Frequency is one of the important physical parameter used frequently, and need to be measured in highaccuracy generally.with the development of modern electronic technilogy and scientific base research, Frequency measurement are becoming more and more important in various fields of science and technology. In recent years, both at home and abroad, the accuracy and stability of frequency standard has benn improved rapidly,with more extensive scope of application. But the measurement and comparison technology of frequency signal with high accuracy and stability can not meet the requirenments yet. At present, along with the tremendous progress in China’s national defense and space technology, more precise measurement and processing of frequency are also required, but frequency measurement still have the problem of computing a large quantity and difficult to achieve real-time
A simple effective frequency estimation method is proposed using cubic convolution.
(1)This method needs only six data calculated by DFT.The performances of the method is illustrated by computer simulations.
(2)Given the values on discrete points, which means a function of the value of Y, corresponding to the point value set X, is known, construct an analytic function (its graph is a curve) through these points, and the values between these points can be calculated.