Forest is one of the most important sources of oxygen on the earth. The survival of most organisms on the earth is inseparable from forest. In addition to the basic oxygen supply, it can also provide wood. It is also indispensable for soil and water conservation, ecological stability and biodiversity.
It is hard to imagine what kind of impact the forest crisis will have on the current ecology, environment and human society.
Among them, the biggest threat to the forest is forest fire, which is sudden and destructive. Once it is out of human control, it is very difficult to deal with and rescue, which is known as a worldwide problem.
There are two main causes of forest fire: man-made fire and natural fire
（1） Man made fire includes the following types:
1. Productive fire sources: fire for agriculture, forestry and animal husbandry production, fire for forest sideline production, fire for industrial and mining transportation production, etc;
2. Non productive fire sources: such as outdoor cooking smoke, cooking, paper burning, heating, etc;
3. Deliberate arson: burning hay, setting off firecrackers and fireworks, etc;
Among the fires caused by man-made fire sources, the forest fires caused by reclamation, burning wasteland and smoking are the most. In China’s forest fires, the fires caused by cooking smoke, burning wasteland and burning paper in Graves account for an absolute number.
（2） Natural fire: including lightning fire, spontaneous combustion, etc. Forest fires caused by natural fires account for about 1% of the total number of forest fires in China.
In the early stage of forest fire, we can do a good job of prevention, respond to the fire at the first time after the fire, and control the fire at the source, which can greatly reduce the fire loss.
Therefore, monitoring and early warning become the key means of forest fire prevention.
User needs analysis
The forest bureau of a county in Jiangxi province needs to monitor the fire in the forest area managed by the Bureau, and deploy remote infrared video instruments to some characteristic points to prevent forest fire and avoid uncontrollable losses;
The area is as follows:
It can be seen from the figure that the altitude drop in this area is huge and the terrain is irregular. If the traditional wiring method is implemented, it will be a huge investment project. Moreover, the wiring method itself will produce fire hazards to the forest. If the forest fire is caused by the monitoring itself, the gain will not be worth the loss.
User scheme design and thinking
According to the current special environment of users, it is necessary to establish a set of real-time video transmission system based on wireless bridge transmission in this area. The system can be powered by solar energy and wind energy, and can work normally without access to conventional power supply. In this way, the fire hazard brought by the video system itself to the forest can be avoided to the greatest extent;
The system can not only transmit the video information collected by the destination equipment to the designated place, but also carry the control signal of the auxiliary equipment at the same time;
In the wireless scheme design, follow the following system design principles: This design mainly implements the “high quality” and “low cost” two main lines to design. The factors of construction, maintenance and operation are considered comprehensively, and there is room for expansion for future development and additional maintenance. The design content of the system is systematic, complete and comprehensive; the design scheme is scientific, reasonable and operable.
Discussion on the implementation of specific scheme
In this scheme, it is divided into two parts, the first part is mainly the mountain forest monitoring point using digital wireless equipment to summarize, and summarize to the commanding height of the mountain forest area, the second part is the remote transmission of the monitoring video of the mountain forest area to the forest fire prevention monitoring center through the wireless equipment.
As shown in the figure below:
Point E is the monitoring center of forest fire prevention, point D is the following monitoring point in the region, and point a, B and C are other monitoring points.
A. D two points transmit video data through sf-5040g;
B. Point C and d use sf-5017ch wireless bridge for video data transmission;
The video data from point d to point E is transmitted by sf-5823wj, which can ensure the sufficiency of video bandwidth while ensuring the transmission distance.
In this scheme, the wireless bridge equipment of each node can accommodate the access of new equipment, which is convenient for customers to set up new monitoring points.
Topology of field wireless transmission equipment:
Editor in charge: GT