Signal time delay stable transmission method and system of broadband

Abstract

The invention provides a signal time delay stable transmission method and system of broadband. The method comprises the steps of producing stable frequency standard signals in a center station, producing light carrier through a tunable laser, modulating the frequency standard signals onto the light carrier, so as to form initial light signals, transmitting the light signals to a remote terminal through an optical fiber, transmitting the light signals of the remote terminal back to the identical optical fiber to the center station, demodulating the light signals which are transmitted back, comparing return radio-frequency signals and the frequency standard signals, so as to obtain a phase difference, controlling the tunable laser to change the length of the light carrier according to the phase difference, so as to obtain compensation light carrier and ensure that the sum of a chromatic dispersion time delay inequality and a link time delay variation is zero, inputting broadband radio-frequency signals from the remote terminal, modulating the broadband radio-frequency signals input by the remote terminal onto the light signals of the remote terminal, so as to form remote modulating light signals, transmitting the remote modulating light signals back, demodulating the remote modulating light signals received by the center station into stable remote terminal radio-frequency signals, and outputting the stable remote terminal radio-frequency signals. According to the invention, additional compensation devices are not needed to be arranged, and the system has a simple structure and high practicability.

Description

technical field [0001] The invention relates to the field of signal transmission, in particular to a broadband signal delay stable transmission method and system. Background technique [0002] In order to improve the accuracy of space electromagnetic spectrum detection, spaceflight control, radar and other systems, measurement and control and detection systems are developing from single antenna to multi-antenna, single base to multi-base. In order to further improve the detection accuracy, the next-generation multi-antenna system must develop towards coherent measurement. To achieve coherent measurement and signal coherent combination between multiple antennas, it is necessary to ensure high-precision time synchronization and high-stability frequency distribution among the antennas. In a multi-antenna system, the distance between antenna units is generally several kilometers or even tens of kilometers. To achieve such a long-distance high-precision distribution of time-freq...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a broadband signal time-delay stable transmission method and system to solve the technical problems in the prior

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