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With the development of wireless technology, the wireless video surveillance industry is also rapidly developing, and the use of wireless video surveillance devices is becoming more and more common. Wireless video surveillance signals also exist everywhere, and then there are more and more wireless video signal interference sources. .
How to avoid the interference of wireless signals has become the most headache problem in the use of wireless monitoring equipment, and it is the primary task in wireless monitoring engineering. Next, let's talk about the four major anti-interference methods in wireless engineering: "One defense, two avoidance, three resistances, four supplements."
A defense: fortification, will reject the interference, measures:
1, double shielded network cable.
2, to avoid the original IP address
3, using double insulated double shielded anti-interference coaxial cable;
4. The camera and the shield are insulated, and the shield connects the earth;
Second avoidance: change the original signal transmission band or transmission mode of the video to avoid interference in the video bandwidth. Measures:
1, using microwave, radio frequency modulation;
2, using digital transformation, processing and transmission methods;
The third resistance: external electromagnetic interference has been "mixed into the video signal" through the transmission cable, the solution is "anti-", the measures are:
1. The transmission transformer suppresses 50/100Hz low-frequency interference;
2, "Chao Bo" technology;
3, video pre-amplification to improve the "signal / interference" ratio (signal to noise ratio) technology: In theory, all should be feasible in practice. However, there are still problems to be solved in dealing with cable transmission distortion and additional amplification distortion.
"Add anti-dry rao device", no modulation and no change, maintain the original video baseband transmission mode, at the same time, it has dual functions of suppressing interference and video recovery.
Four compensations: Anti-jamming is one of the measures to improve the image quality. It is also necessary to take into account the attenuation and distortion introduced by the compensation transmission cables and equipment, restore the original characteristics of the video signal, and ensure the image quality. "Weighted anti-dry radio" and "video recovery host" all have image quality control recovery function;
The four basic principles of anti-interference are the different measures taken from different technical aspects. They grasp their principles, performance, and methods of use. They can be used flexibly in projects to be invincible. With regard to the four basic principles of anti-interference, this formulation is only an individual opinion and may not be exact. The purpose is to understand and select the engineering anti-jamming technical measures, and strive to explore a clear and clear concept and essentials. It is no longer at a loss. It is no longer at a loss. It is no longer about misleading propaganda, and it has made more and higher levels of model projects.
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November 19, 2021