Method and device for measuring arrival time difference of radio-frequency signal

Abstract

The invention relates to a method and a device for measuring arrival time difference of a radio-frequency signal. The method comprises the following steps of: sending signals to a transmission line by two receiving antennae respectively, and allowing the signals to form standing waves in the transmission line; acquiring standing wave signals form the transmission line by a multi-channel acquisition dot matrix, and controlling the multi-channel acquisition dot matrix by a triggering synchronous circuit to perform synchronous acquisition; sending the acquired data to a computer by the multi-channel acquisition dot matrix for calculating and processing; obtaining the signal change condition of one standing wave signal in directions of time and distance; measuring a trigger signal sent to the signal acquisition dot matrix by the triggering synchronous circuit according to setting each time, acquiring by the signal acquisition dot matrix after receiving triggering to obtain level of the standing wave at the moment in the transmission line; and repeating the steps to realize the synchronous and continuous measurement of the standing wave signal. By multi-channel synchronous acquisition of the standing wave signal, a simple method for measuring the signal frequency and phase difference is given. The phase difference is measured by changing the position of measuring a nodal point, the requirement on acquisition system hardware is reduced, and the phase measurement is easy to perform.

Description

technical field [0001] The invention belongs to the radio microwave measurement technology in the technical field of test and measurement, and in particular relates to a method and device for measuring the arrival time difference of radio frequency signals. Background technique [0002] In the field of radio test and measurement, the most important measurement parameters are frequency, power and phase. Traditional methods are relatively mature for frequency power measurement, but the phase of the signal is often difficult to measure because of its rapid change and many factors affected by the environment. On the other hand, with the development of modern communication, the phase error affects the whole system, so the phase measurement is becoming more and more important. [0003] Traditional microwave measurement methods must use mixers to convert high-frequency signals into low-frequency channels for measurement. Not only is the equipment complex, including mixers, local o...

AI Technical Summary

Problems solved by technology

[0003] Traditional microwave measurement methods must use mixers to convert high-frequency signals into low-frequency channels for measurement. Not only is the equipment complex, including mixers, local oscillator signal sources, and digital acquisition modules, but it will also introduce multiple local Additional uncertain factors such as phase error between vibrations, thus increasing the difficulty of measurement

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