Introduction to wireless monitoring:
Rural drinking water safety means that rural residents have timely and convenient access to adequate, clean, and affordable drinking water. Rural drinking water safety includes four evaluation indicators: water quality, water quantity, water convenience, and water supply guarantee rate. By the end of 2015, China's rural water supply has gone through four stages: natural development, drinking water starting, drinking water hydrolysis, and drinking water safety. Since 2016, it has entered a new stage of rural drinking water consolidation and improvement.
The Chinese government attaches great importance to solving the problem of drinking water safety in rural areas, and has formulated a special plan, focusing on financial investment at all levels, and guiding the extensive participation of water users, and the work has achieved remarkable results. Since the implementation of the rural drinking water safety project in 2005, the drinking water safety problems of 520 million rural residents and more than 47 million teachers and students in rural schools have been solved. By 2009, China had achieved the development goal of drinking water safety proposed by the United Nations Millennium Declaration six years in advance; by the end of the "Twelfth Five-Year Plan" period, and with the original foundation, China's rural drinking water safety problems had been basically solved, which is of great significance.
Wireless remote monitoring project requirements:
At present, in some of the plains and rural areas of China, the method of extracting groundwater is used for agricultural irrigation and quotation.
In the early stage, I received the customer's request. In a plain area, the same groundwater extraction and management were centralized. Eight water points were built in multiple surrounding villages, and the same management was performed through the control center. Including remote control, video surveillance and other automation systems.
Because of the long distance between villages, each water intake does not have a network communication foundation. Therefore, the customer decided to use wireless transmission technology to implement data transmission and network monitoring functions based on the geographical environment of the site.
Through the pre-site inspections, the eight water intake points are scattered and independent, and they are far away from each other. Among them, the control center and the No. 1 water intake point can only see each other. The other seven water collection points and the monitoring center are in a non-mutually visible state, and need one or two transfers before data signal transmission.
After the site inspection, we developed a corresponding wireless monitoring transmission solution based on the actual situation, as shown below.
： Basic situation of wireless monitoring :
A total of eight water intake points have been constructed for the entire water intake project. Each water intake point has a motor working room. One of the computer rooms serves as a management center. The center monitors the working status of the motor equipment at the other seven water intake points through a remote management system. At the same time, a high-definition camera is installed at each water intake point to monitor the interior of the pump room in all directions. To prevent other people from entering the computer room.
： Wireless link conditions :
No. 1 is 1.5KM from the control center to No. 2 pump room. No. 2 pump room can be seen up to 4KM away from No. 1, 3, 4, 6, 7, and 8 pump room. It is visible with pump room No. 4.
Wireless remote monitoring solution:
We designed a point-to-point and point-to-multipoint wireless transmission solution based on the on-site terrain environment and the bandwidth estimation of the wireless link:
LA-5839 outdoor wireless bridge point-to-point bridge wireless transmission mode is adopted between No. 1 and No. 2, No. 4 and No. 5. Point 2 also uses a LA-5810N-Plus outdoor high-power version waterproof bridge with 18dbi / 90 ° base station antennas to cover five water points 3, 4, 6, 7, and 8 in a point-to-multipoint wireless transmission bridge mode group Network transmission.
Description of wireless monitoring system design:
1. Independent link:
For point-to-point wireless links, LA-5839 5.8G 300Mbps outdoor wireless bridge is used to transmit data in point-to-point wireless bridging mode. Advantages: stable signal and high effective bandwidth.
2. Decentralized links:
For point-to-multipoint network transmission, the main relay points use high-power outdoor wireless base stations with large main lobe antennas for large-area wireless coverage, and connect the terminal base station signals at the five water intake points to the main control center .
Wireless networking advantages:
After the preliminary inspection, the preparations were carried out in an orderly manner, and the equipment installation to commissioning was completed within two working days. The customer project was successfully completed.