The mysterious veil of solar wireless remote video surveillance is unlocked
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First, the application characteristics Because the system mainly uses the wireless transmission mode of renewable new energy supply, the system has: no need to dig trenches, no power transmission and transformation equipment, no electricity consumption, low maintenance costs, low pressure No danger of electric shock. This type of engineering case is mainly applied to some remote areas and regions where solar energy resources are relatively abundant. Such as highways, power transmission line monitoring, oil and gas pipeline monitoring, forest fire monitoring, border line monitoring, navigational light towers, coastlines, islands (clusters) and so on. Followed by the needs of scenic spots, such as urban scenic spots, tourist attractions, nature reserves, wildlife protection parks. Simply summarized as "three no one" place, that no one no electricity no network cable, but the need for real-time monitoring and management also need to zero-emission pollution-free place or area.
These large-scale monitoring in the field is a new application market for network video surveillance. It puts forward various new requirements for power supply and signal transmission of the surveillance system. The use of solar energy and wireless network transmission to implement long-distance video surveillance will help to significantly reduce the amount of construction materials used and the amount of construction work. It is an effective choice for energy conservation and environmental protection in the field of video surveillance. Wireless solar remote monitoring is an effective combination of the new energy industry and the Internet of Things industry.
Second, the system principle and structure The solar wireless video monitoring system includes solar power generation subsystem, power management subsystem, battery subsystem, camera subsystem, video recording subsystem, data transmission subsystem and other auxiliary subsystems. The overall system architecture is as follows:
From the system architecture diagram, it can be seen that the solar power subsystem and the data wireless transmission subsystem respectively solve the power supply problem and transmission problem of remote monitoring. This is a key system for realizing remote monitoring in the wild. Below we analyze and elaborate on these two important systems.
1. Solar power generation subsystem The solar power generation system is the key to the entire system, and the solar power generation power needs to be determined according to the speed at which solar energy is used to charge the battery. Since battery charging has its own characteristics and the effect of effective sunshine hours, the battery needs one or more days to reach full effect.
Due to the preciousness of solar power generation and battery storage, it directly affects the construction cost of the entire system. Therefore, the low-power operation of part of the equipment in the entire system becomes one of the keys to solar wireless video surveillance. Cameras currently on the market do not provide definitive data in this regard, and many cameras, such as high-speed cameras, use 24 volt AC power. In order to make the voltage of the solar energy and the battery meet the requirements of a commercially available camera, the voltage in the system must be changed. Due to the loss in the voltage conversion process, the effective use rate of the entire system is greatly reduced. "In order to solve this thorny problem, we must establish a wireless solar monitoring system for power supply and related standards and unified. First of all, all cameras and all kinds of equipment are based on DC 12 volts, and meet the requirements of low-power operation, for example, we The motor was replaced with a camera, low-power components were used for some circuits and special design was made, and secondly, the operating time of some of its systems was shortened, for example, the amplifier was turned on automatically only during a call. It meets the requirements of low power consumption and also reduces the power supply cost of the solar energy system.†Wu Yongzheng explained how to save energy in the power supply.
The calculation of the battery is mainly calculated according to the demand of the customer's system for continuous work. “The power generation capacity of solar panels and the capacity of batteries are not a simple proportional relationship,†said Wu Yongzheng. In the case of insufficient power generated by solar panels, it is easy to make the batteries lose power for a long period of time, thereby shortening the battery life. The power supply control system must maximize the use of limited solar power to fill the battery in the shortest possible time. “There is a charging management system in the solar power system we designed that plays a decisive role by performing matrix control of the battery.â€
2. The data wireless transmission subsystem is currently suitable for solar energy wireless video surveillance. There are two data transmission methods: wireless networks, namely WIFI and 3G networks. Both networks have their own advantages, users can have targeted choices.
If the distance between the monitoring point and the monitoring center is several kilometers, and there is no barrier in the middle, or it can be connected to the monitoring center by adding few switching points, this situation is more suitable for WIFI transmission. WIFI transmission can obtain higher effective bandwidth, ensuring the clarity and smoothness of video transmission. “If users can build these WIFI base stations and transfer points through their own capabilities, the overall operating costs will be lower after the system is built, but the initial input costs are high,†said Wu Yongxi. If the monitoring point is far from the monitoring center and there are many buildings and barriers in the middle, using 3G video transmission will be a better choice. With 3G video transmission, video data is transmitted to the monitoring center through the relevant telecommunication operator's network. If you can transmit video over the Internet, it will be easier to implement remote video surveillance across regions. In comparison, WIFI transmissions are suitable for areas with no or less obstructions, such as farms, lakes, swamps, rivers, coasts, and so on. 3G transmissions are more suitable for cities, villages, suburbs and rapid emergency applications due to the support of operators' services.
If it compares economically, Wu Yongzheng calculated an account with the reporter. “We compare the monitoring points at 30KM, and the environment is relatively empty. If we choose 3G transmission, the 3G usage fee to be given to the telecom operators every month is about 600-800 yuan. 10,000 yuan; to replace the battery with a 5-year cycle, the cost of 50,000 for 5 years; if it is WIFI transmission, suppose you want to establish 6 solar transit (base) stations, assuming that each solar transit (base) station The construction cost is 30,000 yuan, which is about 180,000 yuan in total."
From this account, it seems that the cost of 3G is even lower, but the specific project has to be specifically analyzed. Wu Yongzhen explained: "If the radius is within 30KM, the monitoring point is 10 or more, I suggest using WIFI transmission; if the monitoring point is less than 10, then using 3G transmission is more economical, but this also depends on the customer's preferences and needs, Since the 3G bandwidth cannot yet achieve the desired value of transmitting high-quality surveillance images, plus the factor of 3G tariffs, WIFI transmission is used in open areas, which is a bit more. This is also the case in foreign countries."
3. Other subsystems are mainly camera subsystems, which are the center of video surveillance. The project should be based on the entire power consumption parameter of the power-consuming equipment. Therefore, the parameters of these equipments are very important and will directly affect the calculation and design of the solar power generation subsystem and the battery subsystem, which will directly affect whether the entire system can operate normally. At the same time, since solar wireless video surveillance is applied in the wild, it is greatly affected by weather conditions. In our country, the outdoor air temperature is in the range of -40°C to 40°C, so monitoring equipment that can work in such a wide range of climatic conditions is needed. However, in order to solve the problem of working at a low temperature, it is not possible to simply use the method of heating in the camera. Because heating requires a lot of power. Therefore, the use of industrial-grade design standards and the use of industrial-grade components in such monitoring projects allow the cameras to work under relatively wide climatic conditions. The best choice is to reduce the amount of heat generated in the machine.
“In order to make solar video surveillance easier to implement, we have improved the camera's connection interface.†Wu said, “Reducing the use of wires simplifies installation. Our cameras are also provided in addition to standard interfaces for power, video and PTZ control. Trinity's integrated interface uses a single cable to meet the power, video and PTZ control needs."
At the same time, in order to overcome possible video interruptions in the wireless transmission process, corresponding storage devices such as SD cards and hard disks need to be used in the on-site recording devices. In addition, auxiliary systems such as lighting, detection, and alarm can also be equipped according to customer needs.
Third, the application case In order to better understand the solar wireless monitoring video transmission, Wu Yong cited a case of a solar-powered 3G network transmission tower monitoring system.
In order to ensure the safety of production and use of electricity and prevent the destruction of transmission lines, a manufacturing enterprise decided to conduct comprehensive monitoring of the three power supply towers outside the plant. The distance between the three power supply towers and the factory area is 3 to 7 kilometers respectively. Normal inspections use a lot of manpower, vehicles and time. "The establishment of a monitoring system can effectively reduce the cost of monitoring these towers. As the tower is located in the wild, there is no available network and power supply, so the construction monitoring is difficult." Wu Yongzheng said. In this case, the customer chose Qiao Yin Technology Solar Powered 3G network transmission signal camera monitoring system. According to the customer's functional requirements, after calculation, the total front-end monitoring power consumption is about 25W. Solar power can work for 4 to 7 days on continuous rainy days.