Radio-frequency signal stable-phase transmission method and system

Abstract

The invention discloses a radio-frequency signal stable-phase transmission method and belongs to the technical field of microwave photonics. A transmitting terminal divides the frequency of radio-frequency signals needing to be transmitted into two frequencies and then conducts photoelectric modulation, and modulated photo-signals are transmitted to a receiving terminal through a first fiber core of a multi-core optical fiber; the receiving terminal divides the received modulated photo-signals into two parts, wherein one part of the photo-signals are transmitted to the transmitting terminal through a second fiber core of the modulated multi-core optical fiber and then transmitted to the receiving terminal through a third fiber core of the multi-core optical fiber, demodulation is conducted on the part of modulated photo-signals, so that first radio-frequency signals are obtained, and demodulation and frequency tripling are conducted on the other part of the modulated photo-signals, so that second radio-frequency signals are obtained; frequency mixing is conducted on the first radio frequency signals and the second radio frequency signals, filtering is conducted on the frequency-mixed signals through a band-pass filter with the band-pass center frequency identical to that of the radio-frequency signals needing to be transmitted, and down-conversion signals with a stable phase are obtained finally. The invention further discloses a radio-frequency signal stable-phase transmission system. The radio-frequency signal stable-phase transmission system is lower in complexity and implementation cost and higher in compatibility.

Description

technical field [0001] The invention relates to a signal transmission method, in particular to a radio frequency signal phase-stable transmission method and system, belonging to the technical field of microwave photonics. Background technique [0002] Phase-stable transmission technology can be used in radio astronomy, distributed synthetic aperture radar, high-precision standard clock distribution, particle accelerators and other fields, which can keep the phase of the signal stable after transmission. Traditionally, cables are used to transmit radio frequency signals. However, cables are not only lossy and heavy, but also expensive and susceptible to electromagnetic interference. They are not suitable for high-quality, long-distance radio frequency signal transmission. Optical fiber has the advantages of low transmission loss, light weight, cheap price, anti-electromagnetic interference, and large bandwidth. It is suitable for high-quality transmission of radio frequency s...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the existing radio frequency signal phase-stable transmission te...

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