A leaky cable arrangement method applied to a strip-shaped narrow and long area

Abstract

The invention provides a leaky cable arrangement method applied to a strip-shaped narrow and long area, which can avoid the waste of the field strength at the beginning end of the leaky cable, improvethe signal-to-noise ratio of the terminal signal coverage area, shorten the signal switching area, stabilize the switching effect, and achieve the purpose of smooth switching. Which comprises a leakycable combination structure of two regions symmetrically arranged with respect to a central region in the longitudinal direction of the strip-shaped elongated region, On the premise of guaranteeing the total loss of the leaky cable at the end of the link unchanged, the start of the leaky cable combination structure in the two regions away from the center region reduces the quantitative radiationperformance to ensure a small transmission loss, and the end of the leaky cable combination structure in the two regions reduces an appropriate amount of transmission loss to increase the radiation performance.

Description

technical field [0001] The invention relates to the technical field of leaky cable arrangement, in particular to a leaky cable arrangement method applied to strip-like long and narrow areas. Background technique [0002] Leaky coaxial cables are generally used to establish wireless communication in strip-shaped narrow areas such as tunnels, pipe galleries, and mines. The radiation field strength of leaky cables is uniform and is not affected by factors such as tunnel curvature and slope. When the leaky cable is arranged in the area, it connects the symmetrically arranged leaky cables on both sides through the jumper wire located in the central area of ​​the length direction of the narrow and long area. Shorter (1~2m) only serves as a jumping function. Since the transmission loss of the leaky cable increases with the coverage radius, the general coverage radius is designed in consideration of "terminal field strength + engineering margin", which makes the leaky cable The str...

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Problems solved by technology

[0002] Leaky coaxial cables are generally used to establish wireless communication in strip-shaped narrow areas such as tunnels, pipe galleries, and mines. The radiation field strength of leaky cables is uniform and is not affected by factors such as tunnel curvature and slope. When the leaky cable is arranged in the area, it connects the symmetrically arranged leaky cables on both sides through the jumper wire located in the central area of ​​the length direction of the narrow and long area. Shorter (1~2m) only serves as a jumping function. Since the transmission loss of the leaky cable increases with the coverage radius, the general coverage radius is designed in consideration of "terminal field strength + engineering margin", which makes the leaky cable The strong field strength at the beginning end causes waste, and because the 100-meter loss constant of the leaky cable is low, a very long switching area is required to meet the switching conditions when switching at the end. It often happens that the switching is not timely or cannot be switched normally, and other measures need to be taken to improve and solve it. At the same time, these bad situations are often accompanied by low signal-to-noise ratio, which will also affect the communication quality, especially with the MIMO technology With the development of the development, the application of MIMO technology based on leaky cable is becoming more and more extensive. If a high signal-to-noise ratio cannot be guaranteed at the end of the leaky cable, the effect of MIMO (Multiple-Input Multiple-Output) will be seriously affected until it cannot be realized at all. MIMO effect, at this time the communication effect is not even as good as the SISO (Single-Input Single-Output) system

[0003] To sum up, the existing leaky cable layout method in the strip-shaped narrow and long area connects the symmetrically arranged leaky cables on both sides through the jumper wire located in the central area of ​​the long and narrow area, and the outer conductors of the two symmetrically arranged leaky cables are slotted. The parameters are exactly the same, and the length of the jumper is generally short (1-2m) only for jumping, and its defects are as follows: excess field strength at the beginning of the leaky cable and too long switching area at the end, poor switching effect and low signal-to-noise ratio question

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