High-precision phase and frequence measuring system

Abstract

Provided is a high-precision phase and frequence measuring system. An input signal conditioning circuit in the system respectively converts a channel A signal, a channel B signal and a reference clock signal from external input into pulse signals and sends the pulse signals to a field programmable gata array (FPGA) circuit. The FPGA circuit makes a rough count measurement on the time interval between the treated channel A signal and the channel B signal and generates two interpolating pulses at the beginning and the end of the time interval and respectively outputs two interpolating pulses into an integral analog extension circuit. Two integral pulses sent back from the integral artificial extension circuit are received, a count measurement on the pulses which are sent back are respectively made, combining the count measurement and delay correction parameters to obtain phases and frequencies of the A signal and the B signal through calculations, and the phases and frequencies are sent to a host computer through an asynchronous serial communication circuit. The integral extension circuit forms an integral voltage according to the interpolating pulses, compares, reforms and sends the integral voltage to the FPGA circuit. The asynchronous serial communication circuit is used for communicating with host computer serial ports and a parameter storing circuit is used for storing delay correction parameters.

Description

technical field [0001] The present invention relates to a high-precision phase and frequency measurement technology. Based on the traditional rough counting measurement method, the double interpolation method and the integral analog extension method are used comprehensively to divide the time interval to be measured into three parts for precise measurement, so that The measurement resolution of the time interval reaches 50ps, and the measurement range can cover 50ps to any long time interval. This technology has very extensive and key applications in the field of traditional telecommunication engineering practice and nuclear physics theory research, especially in the field of aerospace military technology such as modern laser ranging system and satellite positioning and navigation system. Background technique [0002] Phase and frequency are two important physical parameters of signals, and they are required to be precisely measured in many modern engineering practice and th...

AI Technical Summary

Problems solved by technology

[0014] The technical problem of the present invention is to overcome the problem that the measurement accuracy of the traditional conventional rough counting method is too low, and the measurement accuracy depends on the frequency of the reference clock, and provide a high-precision phase and frequency measurement system

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