The connection of objects to the Internet of Things means that there will be hundreds of billions of devices that will access the Internet, and there are a large number of them. The market for IoT applications based on location services is unprecedented. Positioning technology, whether it is the traditional GPS positioning technology or the use of wireless network positioning technology or short-range wireless positioning technology, has its technical advantages, this article will introduce to you the common Internet of Things in several common positioning methods.
GPS positioning, GPS positioning in the market is the most common. It has good signals, high positioning accuracy, and a wide range of applications. Almost all devices that need to locate will use GPS positioning preferentially. The disadvantage is that it cannot signal through the mixture of metal and steel-reinforced cement and therefore cannot be used indoors such as in underground parking lots, under Takahashi, and under intensive buildings. And when the GPS is first started up, the search speed is slow and it takes about 2~3 minutes, but now this defect is also well resolved. Many GPS positioning devices have AGPS or EPO assisted positioning functions to help search the stars. When positioning the position quickly, it usually takes only a few seconds to get it. Like SKYLAB GPS module, in the case of AGPS or EPO-assisted positioning, the cold start speed can be controlled in about 23s, warm start in 2-3s, hot start is less than 1s.
Beidou positioning, as we all know, Beidou is China's full development of satellite positioning methods that can compete with GPS positioning, positioning principle is the same as GPS, are based on the satellites in the sky to determine the current location. Although the principles are the same, but there is still a certain gap between the positioning accuracy and the scope of use. Now it is still mainly used for military purposes. The civilian range is being vigorously promoted. The civilian range positioning accuracy is from several meters to tens of meters. Positioning chip prices are higher than GPS modules. The current Beidou III navigation system can provide high-precision, highly reliable positioning, navigation, and timing services for all types of users around the world and all-day, and it has a unique short message communication function. Compared with the Beidou-2 satellite system, the performance and system reliability of the Beidou-2 satellite system have been greatly improved except that the coverage area has expanded from regional coverage to global coverage. At present, Skylab's Beidou module (multi-mode) has an independent positioning accuracy of 3M. Based on the satellite-based augmentation system, positioning accuracy can reach 2.5M.
Base station positioning, base station positioning is also a very common positioning method, it is based on the base station established by the three major communication operators to locate, then its advantages and disadvantages are very obvious, the nearby base stations point more, then positioning is accurate, if There are few sites or even none, so there is a large positioning error, or it cannot be located. In general, regardless of the number of base stations, the positioning error of the base station is about tens of meters, and the error is a few hundred meters.
WiFi positioning , WiFi positioning is actually a kind of indoor positioning method, but as WiFi covers a wide range of outdoor areas, it has gradually been applied to outdoor positioning technology. The principle of wifi positioning is not detailed here. It is even more difficult to understand technical things. As long as we know, under normal circumstances, the location of wifi hotspots (that is, APs or wireless routers) is fixed. As long as the hotspot is powered on, no matter how it is encrypted, it will surely send signals to the surroundings. As long as the device can scan wifi, it does not need to connect to the wifi. The locating end can send the detected hotspot information to the server. The server uses this information as a basis. , Query, calculation, you can know the specific location of the client. The accuracy of WiFi positioning is also very high, the disadvantage is that the client must be able to access the Internet, and there must be WiFi hotspots nearby, leaving the big city, this feature is very difficult to use.
Bluetooth Beacon indoor positioning, in simple terms, Beacon is a small information base station, can be used in indoor navigation, mobile payment, in-store shopping guide, flow analysis, item tracking, and all other activities related to people in the indoor flow. What Beacon technology does is to capture and push information to mobile devices within the communication coverage through Bluetooth Smart.
1. These Bluetooth beacon base stations continuously send beacon broadcast messages
2. After receiving the beacon broadcast message, the terminal device equipped with the Bluetooth 4.0 module measures the received power and brings it into the function of the relationship between power attenuation and distance, and measures the distance from the beacon base station.
3. The use of distances from multiple beacon base stations enables multipoint positioning.
Indoor and outdoor integrated positioning solutions, based on TD04 indoor and outdoor integrated positioning solutions, outdoor applications are still mature GPS / BDS satellite positioning + mobile base station assisted positioning, indoor is the use of Bluetooth positioning technology. With the continuous expansion of the application technology of positioning technology in the Internet of Things industry, the demand for positioning by emerging applications is not limited to a purely outdoor scene. New demands have also been put forward in indoor positioning and hybrid positioning in various environments. The emergence of the SKYLAB indoor + outdoor integrated positioning solution _TD04 is in line with the development trend of organic integration of a variety of positioning technologies. On the one hand, it can improve the existing positioning accuracy, on the other hand, it can greatly expand the coverage of space positioning and achieve from outdoor Wide-area coverage in the interior, forming an all-directional positioning navigation signal service technology.
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