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GPS positioning requires simultaneous reception of at least three or more satellite signals, but in the case of urban sections responsible, high-rise or viaduct is likely to make the receiver to lose lock of some satellites, when the GPS data would be data flowing, resulting in a large deviation, while the navigation error is mostly caused. This is also the GPS is not used in the indoor. Complex urban traffic, in addition to the vehicle self-navigation system, real-time traffic navigation system is also essential. 99% of Japan's car navigation systems installed VICS real-time traffic information receiver, an effective tool to reduce congestion and improve travel efficiency and reduce environmental pollution. In China, real-time traffic information collection and transmission infrastructure is gradually established, by bus, the electronic eye and human fixed-point observation, real-time traffic information sent to the user's navigation device, in order to achieve a more scientific and efficient navigation. In recent years, China has independently developed the Beidou satellite navigation system will gradually into the civilian areas, the Beidou satellite navigation worth the wait. "The biggest advantage of the Big Dipper is a communication function, the GPS can only receive signals, Compass can send Wenchuan earthquake, the phone can not get through, relief can only use the Beidou navigation Yang of the person in charge of national communications and navigation equipment Quality Supervision and Inspection Center also The author describes the Beidou system in the navigation area, the product of many companies also began production of the Big Dipper. " I learned from the national communications and navigation equipment Quality Supervision and Inspection Center, in fact the country back in the 1990s had already introduced the national standards of navigation products, navigation systems for portable, embedded and mobile phones and other various forms of different implementation details of test items cover the packaging and appearance, ease of use, the room temperature electrical properties, functions, navigation software, verify that the path planning, environmental adaptability, after-sale technical support, security, continuous power supply, electromagnetic compatibility, not only on the product's technical requirements, are also particularly concerned about the practicality. "Because this test is not mandatory, so thanks to the enterprise consciously, of course, a lot of money the cost of testing is one reason." Yang told reporters. It is understood that the detection of the product about three months time, in Hainan, Turpan and remote areas such as product performance, the actual inspection. While most of the products lies in the remote areas of the map accuracy and signal reception capabilities. According to statistics,Main products: car dvd player, car gps and car dvd are with good quality. in February of this year, held in Beijing in the Certification Center of China Electronics Technology Group Corporation 54th Research Institute, China Electronic Chamber of Commerce, the National Communication and Navigation Equipment Quality Supervision and Inspection Center jointly organized the "China's first satellite navigation product certification results conference and the Big Dipper Industrial Development Seminar.
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