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PositionaIAccuracy Beidou satellite
2017-09-19 23:46:47
       PositionaIAccuracy is the proximity between spatial entity position information (usually coordinate) and its real location.
       In machine manufacture, the difference between the actual position of a part or a tool and the standard position (theoretical position, ideal position), the smaller the gap, the higher the accuracy. It is the premise that the machining accuracy of parts can be guaranteed. Mechanical Seiko has a very high demand for accuracy, and subtle differences can have serious consequences. The unit of accuracy is very small and is usually made of nanometers.
       China Beidou satellite navigation system, satellite navigation system is the world's fourth largest after the United States GPS, the Russian GLONASS and Galileo. Location effect analysis is an important part of the performance evaluation of navigation systems. Previously, due to geographical restrictions, the Beidou global positioning effect analysis can only be achieved by means of simulation.
       The study was conducted by the Wuhan University Institute of Surveying and mapping China Antarctic Research Center Du Yujun, Wang Zemin and other researchers, in 2011 and 2012 twenty-eighth Chinese Antarctic scientific expedition, along a wide range of acquisition of compass and GPS continuous data, Chinese span north to Tianjin, South to the Antarctic Kunlun station. At the same time, the static observation data of Zhongshan Railway Station in China are collected. In order to compare and analyze the effect of static positioning in different regions, static observation was also carried out in Wuhan.
       The researchers analyzed by rigorous methods, ratio, multipath, visible satellite number, accuracy factor, positioning accuracy from the aspects of signal-to-noise, comparative analysis of Beidou and GPS in the course of different areas, especially the location effect of different state of motion in the ocean and the Antarctic region.
       The results show that the signal quality of Beidou system is roughly the same as that of GPS. In the middle and low latitude 45 degrees, the Beidou dynamic positioning accuracy is comparable to that of GPS level and elevation direction are respectively 10 meters and 20 meters; the horizontal positioning accuracy of the Beidou static meter level, and GPS considerable, elevation 10 meters, slightly less than GPS; in high latitude area, because a small number of visible satellite Beidou satellite distribution is poor, poor positioning accuracy or could not be located.
       At present, the Beidou has achieved regional positioning, but it does not have the global positioning capability. The difference between Beidou and GPS in positioning effect is mainly caused by the number and distribution of satellites." Professor Wang Zemin, deputy director of the China Antarctic Survey and research center of Wuhan University, said: "at the end of the research data collection, the Beidou system has 11 satellites in orbit.". Last month, China successfully launched a new generation of Beidou navigation satellites, and the Beidou system has reached 17 satellites in orbit. With the Beidou system global network kicked off, I believe that the actual data in the future will be more exciting.

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