【正文】
well Corporation and SiRF Technology Corporation. (2) in the military field In the military field, GPS also has had for warships, aircraft, bat vehicles, ground operations personnel to provide allweather, continuous realtime, highprecision positioning and navigation, expanded to bee the positeguided precision guided weapons, an important technical means. Its working principle is the use of GPS receivers installed in missiles to receive four or more navigation satellites transmit signals to modify the missile39。s flight path, to improve guidance accuracy. Different from the big error, the lower civil standard of precision location services, the military use of the precise positioning service. Data show that GPS guidance system is not configured before, the . military39。s structure and status 2 Entered the civilian GPS, the user terminal39。s positioning technology for wireless munication, for example, developed in partnership with Infineon for the wireless munication system architecture and the end of the First GPS Mloc module to the wireless location device market to gain an advantage. 3, the global GPS market conditions With the application of the expansion, GPS products have gradually bee a global wireless munications market, an important endproducts, and promote high growth GPS market is the major factor in car navigation systems and wireless munications bined with the popularization of GPS products. According to market research firm ABI39。s MMASIC chipset GPS receiver signal, and then fired by the systemside positioning signal to the phone side, to address the multiple signal attenuation problem. The pany currently has partnerships with panies including Motorola, NEC, NTT Mobile Communications Network Inc. (NTT DoCoMo) and the United States such as Texas Instruments. SiRF Technology, Inc. Wireless Location Technology solutions pany with similar fasttrack, that is, its SiRFLoc structure installed in the wireless work side, so that the wireless base station can receive and transmit satellite positioning data, on the other hand sucked its SiRFstar chipsets embedded in mobile phones on the base frequency, or using IP integrated GPS receiver and a way to integrate a mobile phone chipsets. Currently SiRF Technology, Inc. in the wireless munications major partners NTT Mobile Communications Network, Ericsson, Nokia and signal software panies. Although the GPS positioning function with the potential of the mobile phone market is quite promising on this stage there is still urgent need to overe several obstacles: first, whether cell phone use is the builtin GPS chips or modules as with external GPS solution, will no inevitably increase the cost of handsets, will also affect consumers。s power consumption。 second is the user39。s rapid development and the national popularity of the system bottlenecks as a munication work through the public work using GSM short message service to find a new way, which is the development of GPS vehicle tracking system plays a significant promoted. China now has the world39。s satellite navigation user equipment, the conditions of the market matures, volume of user groups is taking shape, has entered a period of rapid development of application sector. . Federal Communications Commission requirement to 95% of 2021 . cell phone users to be equipped with positioning capability, the end of 2021, 95% of new mobile phones have location capabilities. The mobile phone and GPS bination is the best solution. Currently, a number of major international mobile phone manufacturers such as Nokia, Ericsson and Samsung have begun to use the integrated GPS chip, while Japan39。s economic development, especially after joining the WTO, to believe that the GPS locationenabled mobile phones in China will have huge market potential, a few years, beyond the vehicle applications, to bee the largest application of GPS area. Uni Unlimited a feature which is Dingweizhixing, which is based on GPS One, to provide the highest accuracy of the mobile munication field, the most intuitive location services, obtain location information to replace text messages, users can by phone or online map accurate to 5 meters positioning. With this feature, from the traffic police to maintain safety, security detection, logistics and timely transmitted to the taxi driver to master the traffic situation, and even lost children or family members home late, can provide the correct use of GPS One location information, access to its location, greatly improve work efficiency, and convenient life. Dingweizhixing transmission of information via satellite and through China Uni GPS One server sends to users phones. Once the GPS and wireless munications and the Inter together, the consumer market even flourish. Particularly cheap and practical access to family and close and personal goods in China will have a market, and promising. Typical applications in this area a lot, such as PDA, personal positioning products (such as tracing device, approach to the instrument, emergency alarm, etc.) as well as asset tracking devices and other meteorological radiosonde. 2, GPS Trends in China39。s vehicle fleet center monitoring methods are used, the system by the monitoring center, located in the master control center and installed in mobile vehicles such as the substation 3 parts. The working principle is: installed on the vehicle39。s current location, munications controller output signal from the GPS receiver to extract the required position, velocity and time information, bined with vehicles, such information as the formation of data packets, and then sent to the control center by wireless channel. The master control center to receive substation to send the data and extract the location information, according to the vehicle39。s daily life.