Beidou navigation system is for an inclusive attitude

At the Xichang Satellite Launch Center in a few days ago, China has just successfully two Beidou navigation satellites "to kill Double Star" into the circular orbit (MEO orbit). At this point, the Beidou satellite navigation system has 13 satellites to launch the operation, this year, China also plans to launch three Beidou navigation satellite to achieve coverage of the Asia-Pacific region positioning, navigation, timing and short message communication.

    The Defense Electronics Show, manufacturers of related fields has brought a large number of different application environments, and performance and reliability requirements of navigation products, there are a lot of support for the Beidou satellite navigation system. These products are military navigation products, in part, civil.

    At present, the domestic manufacturers began research and development and production based on the Beidou navigation system, the civil navigation products, such as car navigation systems, the market for these products from the function marking the Beidou navigation system has gradually perfected. Looking at the Defense Electronics Exhibition of satellite positioning and navigation products, mostly to give priority to supporting the U.S. GPS system, Beidou system then is independently developed in China and the Russian GLONASS and the European Galileo system. According to the relevant person in charge of a navigation device vendors in the exhibition, said the Beidou navigation of the biggest challenges in the military field of positioning and navigation positioning accuracy is not high enough, the stability is not good enough.

    Beidou navigation system, only four satellites will be able to achieve positioning function, but not high positioning accuracy. Although 13 satellites into the work, but the actual positioning accuracy of the Beidou system yet only about 10 meters, and mature and complete GPS system improved after decades of development, there are still significant technology gap. At the same time, the Beidou system stability yet not be compared, and GPS. In practical applications, the positioning accuracy, speed and stability of the positioning car camera and backup camera system is the most important indicator of the positioning and navigation system, especially in the field of military applications, high-precision positioning system is a prerequisite for precision strikes. In the gap on these core indicators, the Big Dipper, GLONASS and Galileo systems, yet only as a supplement of the GPS system, complete the positioning auxiliary in the GPS system is facing shortage of work.

    Asked Beidou system in the civilian areas of application, the official said, civilian areas, such as car navigation systems, the market for most products is still the main use of GPS, the Beidou system applications. Beidou Navigation and GPS gap in accuracy in fact is not particularly worried about, because the Beidou system navigation device in actual use, positioning deviation of only tens of meters in the line of sight within the scope of this daily use it and will not cause too great an obstacle. The biggest challenge is the size and cost of the receiver chip. Due to various technical limitations, the receiver chip of the Beidou system being unable to do so and GPS chip is small, the Beidou system into civilian use, especially handheld devices caused no small challenge. In addition, higher costs compared to the GPS chip will make the end products of higher prices is not conducive to the promotion of the Beidou system.