Digital microwave image transmission system and transmission method

Abstract

The invention discloses a digital microwave image transmission system comprising at least a digital microwave transmitting terminal, at least an antenna module, at least a relay base station, an optical fiber network and a signal centralized processing center, wherein, the antenna module comprises an omnibearing receiving antenna and a frequency-selecting filter, each relay base station comprises an amplifying module, a frequency-selecting filtering module, an amplification processing module, a multiple-frequency point mixed processing module and an electro / optical converting module, the signal centralized processing center comprises a networking receiver device and a digital microwave device, and the networking receiver device comprises an electro / optical converting module and a frequency selecting module. The transmission system is arranged at the signal centralized processing center via the digital microwave device, thus reducing investment cost of the base station, realizing all-weather working, and having higher safety and reliability. The invention further discloses a transmission method using the digital microwave image transmission system.

Description

technical field [0001] The invention belongs to the field of radio and television communication, in particular to a mobile digital microwave networking technology that combines wireless microwave and optical transmission technologies. Background technique [0002] In recent years, digital microwave technology, especially digital microwave mobile transmission / reception technology, has become more and more popular in the field of radio and television, and has played an important role in major TV live broadcasts, news reports, and signal connection transmission. Orthogonal frequency division multiplexing (orthogonal frequency division multiplexing) is the most advanced and most promising modulation technology in the world at present. Its basic principle is to distribute high-speed data streams to several sub-channels with lower transmission rates through serial-to-parallel conversion. to transfer. Coding (C) means that the channel coding adopts a variable coding rate convoluti...

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Problems solved by technology

[0005] (1) The base stations in these two networking modes need to be equipped with microwave receiving and decoding devices, and digital microwave equipment, especially imported digital microwave equipment, is very expensive, and requires professionals to be on duty during operation, which increases the cost of use; at the same time, expensive The imported microwave equipment has been installed in harsh outdoor base stations for a long time. There are hidden dangers in the safety guarantee itself, and the maintenance cost is high;

[0006] (2) The installation and debugging technology of the base station is complicated, which limits the scale of the network, and because the signal is received by the directional antenna, the coverage area is small, only the selective coverage of the key areas can be guaranteed, and the complete wireless coverage of the network area cannot be achieved. Seam coverage requirements;

[0007] (3) The image signal is transmitted by optical fiber after being decoded by the decoder at the base station. During the transmission process, it is easy to be intercepted and cause information leakage, especially when transmitting some high-security information. This type of image transmission system is not Priority selection, poor security;

[0008] (4) Certain image transmissions are irregular and require the decoder to be turned on around the clock, which may easily cause the decoder to crash or even be damaged; and if a special person is assigned to be on duty, it will only be turned on when needed. Due to the large number of base stations, if every All base stations are assigned personnel on duty, which will increase the cost of use

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