Microwave optical fiber link device for long-distance transmission of radar reference frequency signals

Abstract

The invention discloses a microwave optical fiber link device for long-distance transmission of radar reference frequency signals and relates to the technology of radar detection. The microwave optical fiber link device consists of an optical emitter, an optical receiver, a Faraday rotating mirror, an optical circulator, a polarization maintaining optical fiber, a radio-frequency power amplifier and the like. By subjecting microwaves to electric-optical and optical-electric conversion and utilizing the advantages of low insertion loss and high-temperature phase stability of the optical fiber, the microwaves are transmitted in low phase fluctuation and loss in the long distance. The microwave optical fiber link device can be used for transmission of rate-aided signals of spatial long-base line interference synthetic aperture radar (SAR) and transmission of reference frequency signals of radar systems such as phased array radars and multi-base radar monitoring net. Besides, phase changes caused by environmental factors such as temperature and irradiation can be accurately compensated during long-distance transmission of X-wave band microwave signals, and meanwhile, the microwave optical fiber link device has ultrawide radio-frequency (RF) working band and can be developed for transmission of radar reference frequency signals ranging from 50MHz to18GHz.

Description

technical field [0001] The invention relates to the technical field of radar detection, and is a microwave optical fiber link device for long-distance transmission of radar reference frequency signals. Background technique [0002] In radar systems, long-distance stable transmission of microwave signals with reference frequency signals is usually required, such as calibration signal transmission in space long baseline dual-antenna interferometric SAR topographic mapping system, and reference frequency of radar systems such as phased array radar and multistatic radar monitoring network Signal transmission. The radar system requires a stable phase (or the transmission delay of the corresponding frequency) for the transmission of the reference frequency signal. However, the phase of the traditional microwave feeder, such as the coaxial cable, is greatly affected by the external environment. In the temperature range of -50℃~-10℃, using a 100m coaxial cable to transmit X-band 9....

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Problems solved by technology

The radar system requires a stable phase (or the transmission delay of the corresponding frequency) for the transmission of the reference frequency signal. However, the phase of the traditional microwave feeder, such as the coaxial cable, is greatly affected by the external environment. In the temperature range of -50℃~-10℃, using a 100m coaxial cable to transmit X-band 9.6GHz will bring a phase error of more than hundreds of degrees, resulting in an elevation measurement error of tens of meters. At the same time, the coaxial cable has a transmission plug The shortcomings of large loss, large volume and weight, etc., are even more difficult to meet the requirements in the application of phased array radar and multi-static radar monitoring network with longer distance

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