Maritime ultra-short wave beyond visual range communication device

Abstract

The invention relates to a maritime ultra-short wave beyond visual range communication device, and belongs to the technical field of the communication device. The device is composed of a radio frequency receiving unit, a radio frequency transmitting unit, a baseband unit and so on. The device is characterized in that an antenna is connected with the radio frequency transmitting unit and the radio frequency receiving unit through an electronic switch. The radio frequency transmitting unit and the radio frequency receiving unit are connected with the baseband unit. The radio frequency transmitting unit is composed of an excitation module and a power module. The radio frequency receiving unit is composed of a radio frequency front end module, a frequency conversion module, an intermediate frequency amplification unit and an intermediate processing module. The baseband unit is composed of a DSP digital signal processing unit, an FPGA field-programmable gate array module. The device has the advantages that the noise coefficient is low, the sensitivity is high, the dynamic range is wide, the low signal to noise ratio demodulation is accurate, the multi-path interference of remote communication can be reduced, the maritime beyond visual range communication distance is long, the communication quality is good, and the existing problems that the multi-path interference of the remote transmission is serious, the noise interference is high, the beyond visual range communication cannot be realized, and the maritime beyond visual range communication quality is influenced are solved.

Description

technical field [0001] The invention relates to a marine ultrashort wave over-the-horizon communication device, which belongs to the technical field of communication equipment. Background technique [0002] At present, most ultrashort wave communication equipment can only communicate within the line of sight, and the communication distance at sea generally reaches 60 kilometers. The use of marine ultrashort wave over-the-horizon communication equipment can basically meet the communication distance requirements of ultrashort wave communication in offshore waters. Over-the-horizon transmission at sea is mainly realized by tropospheric refraction. Due to the large attenuation loss of refraction transmission, especially in bad weather, the multipath interference of the signal after refraction is serious during long-distance transmission, which generally manifests as noise interference in the equipment. At this time Just can't realize trans-horizon transmission, seriously affect ...

AI Technical Summary

Problems solved by technology

Over-the-horizon transmission at sea is mainly realized by tropospheric refraction. Due to the large attenuation loss of refraction transmission, especially in bad weather, the multipath interference of the signal after refraction is serious during long-distance transmission, which generally manifests as noise interference in the equipment. At this time It will not be possible to achieve trans-horizon transmission, which will seriously affect the quality of maritime trans-horizon communication

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