Product positioning of mobile phone positioning system

Mobile location service refers to determining the actual location information (latitude and longitude coordinate data) of mobile users through the cooperation of wireless terminals (such as mobile phones and PDA). ) and wireless networks, so as to provide value-added services related to location and direction that users need. Location service, also known as LBS-Location Based Service, is a value-added service that obtains the location information (latitude and longitude coordinates) of mobile terminal users through the networks of telecom mobile operators (such as GSM networks and CDMA networks) and provides users with corresponding services with the support of electronic map platforms. Mobile location service originated in the United States. As early as 1996, the Federal Communications Commission (FCC) of the United States required mobile operators to provide emergency help services for mobile phone users, that is, to provide the location of callers for timely rescue. They named this mobile location service E9 1 1. Since then, Japan, Germany, France, Sweden, Finland and other countries have launched their own business location services. At present, many countries in the world have promulgated the requirements for mobile location services in the form of laws. For example, the American FCC E 9 1 1 stipulates the accuracy standard of location services provided by operators for 9 1 1 users in the form of law, and the European Union has also promulgated laws following the American FCC standard, and in 2003-65438. By the way, location-based services have attracted people's attention to privacy. Wireless communication companies and regulators must study policies that allow users to protect their privacy when entering address information.

Xingke's GPS positioning mobile phone is an alarm positioning mobile phone for people with special needs to call for help with one button when they are in distress, and quickly determine the target position with 1 10 and 120 for rescue, so that parents can inquire about the walking position of the old and the young and monitor the safety. You can also get alarm information from GPS mobile phone through mobile phone, which is a "portable nanny" for personal safety and family care. It is suitable for people who need emergency alarm for help in case of robbery, difficulty, loss, sudden acute diseases (heart disease, hypertension) and possible disasters, as well as children, the elderly, mentally retarded and other people who need supervision. Positioning satellite service is a high-precision positioning service provided by China Unicom CDMA 1X network with advanced GPSONE positioning technology. The positioning accuracy is as high as 5 meters to 50 meters in outdoor environment. At the same time, no matter indoors or outdoors, as long as the CDMA 1X network covers the place, positioning can be realized and the positioning time can be shortened. Unicom's infinite positioning star service is based on the positioning of mobile terminals, and combined with GIS (Geographic Information System) map data information, it can provide users with rich location information services.

Interactive horizon service is a wireless Internet service provided by China Unicom for CDMA users. You only need to use a mobile phone terminal that supports the browser function above WAP 1.2. For example, LG's CU8080, CU8 180, CU8280, Samsung X 199, Samsung X3 19, Samsung X339, Putian SCP 550, Putian SCP 580 and ZTE G2 18 can all use this service, and the operation is similar to that of China Mobile. Unicom's mobile phone data communication fee standard is 0.0 1 yuan /kB.

Here we illustrate the use of GPS through an example: enter the positioning star function of Kyocera KZ850 and select "Where am I?" . Subsequently, a picture of Zhang Weixing will appear on the screen of KZ850. After a few seconds to ten seconds of inquiry, the description of the current location of the mobile phone will be displayed on the screen, such as "Wanquanhe Road, near Wanquan New Home". At this point, the user can further query the map of the current location. If you continue to query "Parkson" and search Parkson Shopping Center, KZ850 will give the detailed location and contact number of Parkson, and can display the bus transfer route from the mobile phone location to Parkson.

Do you find it convenient to read the above description? Especially for some natural "road blind" friends, the mobile phone positioning function will definitely help you solve many travel problems.

With the development of mobile technology, mobile phones not only have the function of talking, but also can be regarded as GPS positioning system. In our daily life, we often go out, and being in a big city often makes people lose their way and can't find their place. At this time, if you bring a powerful mobile phone, you can use it to locate yourself. When you and your friends authorize each other, you can also find them by mobile phone. Let's take a look at its specific working principle and operation process.

Mobile phone location service is a location service based on communication location in wireless state. With this service, mobile phone users can easily know their current exact location and use their mobile phones to query or collect information from nearby places; The great charm of mobile location service is that it can send the right information to the right person at the right time and place.

At the same time, it can also locate the mobile phone users and monitor and track their positions in real time, so that all the controlled objects can be clearly seen on the electronic map of the monitoring center. Therefore, mobile phone location service has a broad application prospect in the field of wireless mobile.

GSM mobile phone location service system mainly consists of four parts: user's mobile phone, GSM network, SMS service center and application server.

The user's mobile phone sends a demand message to the SMS service center through the GSM network, and then the SMS service center sends the user information to the application server to query the location and demand information of the user's mobile phone, and the query result is fed back to the user's mobile phone through the GSM network through the SMS service center.

Based on mobile tracking and communication processing software, wireless positioning system has powerful data processing ability, and integrates tracking, monitoring, positioning and alarm on the basis of rich and accurate geographic information data and complete information search engine, which can be widely used in government vehicle management, traffic management, public security, banking, railway, postal service, rental, freight and other industries. With the help of the Internet, it supports large-capacity users to use at the same time, and provides multi-level user confidentiality agreements. This is a new mobile phone positioning technology. But because it involves invasion of privacy, it has never been known to the general public. This kind of mobile phone positioning is not traditional GPS positioning, but based on the feedback of base station information signal to lock the position of mobile phone. That is, LBS base station positioning method. So far, this mobile phone positioning method is only used in public security technology to solve crimes. You only need to know the mobile phone number, and the owner can lock the owner's position when the signal is turned on. Because LBS is interfered by base station signals, weather, radio waves and other signals, its accuracy is not particularly ideal. The urban area is about 50M-200M.

Mobile phone location service has a huge industrial chain lineup beyond traditional value-added services, which consists of mobile operators, system equipment providers, terminal manufacturers, GIS developers, application providers, middleware providers and other links. It comprehensively uses technologies and applications including mobile communication, satellite navigation, Internet, geographic information system, integrated information service, etc. It is the product of multi-industry and multi-technology cross-integration. Mobile phone location service needs continuous and huge investment, especially in network upgrade and electronic map. Global Positioning System (GPS) is a new generation of space satellite navigation and positioning system jointly developed by the United States Army, Navy and Air Force in 1970s. Its main purpose is to provide real-time, all-weather and global navigation services for land, sea and air, and it is also used for some military purposes such as intelligence gathering, nuclear explosion monitoring and emergency communication. It is an important part of America's global dominant strategy. After more than 20 years of research and experiments, it cost 30 billion dollars. By1March 1994, 24 GPS satellite constellations with global coverage of 98% had been deployed.

GPS composition

The global positioning system consists of three parts: (1) the ground control part, which consists of the main control station (responsible for managing and coordinating the work of the whole ground control system), the ground antenna (injecting the search message into the satellite under the control of the main control station), the monitoring station (automatic data acquisition center) and the communication auxiliary system (data transmission); (2) Space part, which consists of 24 satellites and distributed on 6 trajectory planes; (3) User equipment is mainly composed of GPS receiver and satellite antenna.

The main features of GPS are: (1) all-weather; (2) Global coverage; (3) The three-dimensional constant speed timing accuracy is high; (4) Fast, time-saving and efficient; (5) It has a wide range of uses and diverse functions.

global positioning system (GPS)

Twenty-four GPS satellites orbit the earth at a height of 12000 km from the ground, with a period of 12 hours, so that more than four satellites can be observed at any time and at any point on the ground.

Because the position of satellite is accurately known, we can get the distance from satellite to receiver in GPS observation. Using three-dimensional coordinates and the distance formula in three satellites, three equations can be formed to solve the position (x, y, z) of the observation point. Considering the error between satellite clock and receiver clock, there are actually four unknowns, X, Y, Z and clock difference, so it is necessary to introduce a fourth satellite to form four equations to solve, so as to get the latitude, longitude and elevation of the observation point.

In fact, receivers can often lock on more than four satellites. At this time, the receiver can be divided into several groups with four satellites in each group according to the constellation distribution of satellites, and then the group with the smallest error can be selected by algorithm to locate, which improves the accuracy.

Due to the error of satellite orbit and satellite clock, the influence of atmospheric troposphere and ionosphere on signals, and artificial SA protection policy, the positioning accuracy of civil GPS is only 100 meters. In order to improve the positioning accuracy, differential GPS(DGPS) technology is widely used to establish a reference station (differential substation) for GPS observation. By comparing the precise coordinates of the known reference station with the observed values, a correction number is obtained and released. After receiving the correction number, the receiver compares it with its own observation value to eliminate most errors and get a more accurate position. Experiments show that the positioning accuracy can be improved to 5 meters by using differential GPS.

GPS classification

There are many kinds of GPS satellite receivers, which are divided into geodesic type, all-station type, time service type, hand-held type and integrated type according to models. According to the purpose, it is divided into vehicle, ship, airborne, satellite and missile.

After more than 20 years of practice, it has been proved that GPS system is a high-precision, all-weather and global multifunctional radio navigation, positioning and timing system. GPS technology has developed into a multi-field, multi-mode, multi-purpose and multi-mode international high-tech industry.

GPS prospect

GPS technology, with its all-weather, high-precision and automatic measurement characteristics, has been integrated into various application fields of national economic construction, national defense construction and social development as an advanced measurement method and new productivity.

With the end of the Cold War and the vigorous development of the global economy, the United States government announced that it would cancel the selective availability from 2000 to 2006 on the premise of ensuring the national security of the United States, and the accuracy of GPS civil signals worldwide would be improved. The accuracy of single point positioning using C/A code is improved from 100 m to 20 m, which will further promote the application of GPS technology, improve productivity, work efficiency, scientific level and people's quality of life, and stimulate GPS. According to experts' prediction, in the United States, the market of car-mounted GPS navigation system alone will reach 3 billion dollars after 2000, and in China, the market of car-mounted navigation will also reach 5 billion yuan. It can be seen that the application prospect of GPS technology market is very considerable.

main feature

All-weather, global coverage, high-precision, fast, time-saving, efficient, widely used and multifunctional stereo constant-speed timing.

Main applications

1, land applications, mainly including vehicle navigation, emergency response, atmospheric physical observation, geophysical resource exploration, engineering survey, deformation monitoring, crustal movement monitoring, municipal planning control, etc.

2. Marine applications, including the determination of the best navigation route of ocean-going ships, real-time ship dispatching and navigation, maritime rescue, marine treasure exploration, hydrogeological survey, offshore platform positioning, sea level fluctuation monitoring, etc.

3. Aerospace applications, including aircraft navigation, attitude control of aerial remote sensing, orbit determination of LEO satellites, missile guidance, aviation rescue and manned spacecraft protection detection.

Beidou navigation system

Beidou satellite navigation system is a global satellite positioning and communication system (CNSS) developed by China. It is the third mature satellite navigation system after American Global Positioning System (GPS) and Russian GLONASS. China version of GPS. Navigation system consists of space terminal, ground terminal and user terminal. It can provide high-precision and reliable positioning, navigation and time service for all kinds of users around the world all day, and has the ability of short message communication. At present, it has initially possessed the ability of regional navigation, positioning and timing.

Beidou navigation system, as a national strategic emerging industry, has been included in the Outline of National Medium and Long-term Science and Technology Development Plan 16 as one of the major science and technology projects.

The Twelfth Five-Year Plan for the Development of Navigation and Location Services issued by the Ministry of Science and Technology in September 20 12 clearly points out that by the end of the Twelfth Five-Year Plan, the scale of navigation and location services industry will exceed 10 billion yuan, five high-tech industrialization bases will be initially established, 30 innovative enterprises will be cultivated, and about10 demonstration and experimental applications will be formed.

According to the prediction of China Satellite Navigation and Positioning Association, by 20 15, the output value of satellite navigation and location service industry in China will exceed 225 billion yuan; By 2020, China will build the Beidou global satellite navigation and positioning system. By then, the user scale of China's satellite navigation and location industry will become the largest in the world, with an annual output value exceeding 400 billion yuan, of which 20% will come from export revenue.

Will break the GPS monopoly

For a long time, due to the relative backwardness of key technologies and output in the field of navigation in China, GPS is almost in a monopoly position in China. In power transmission, communication, finance and other fields, there is a serious dependence on GPS.

According to the statistics of the Consulting Center of China Satellite Navigation and Positioning Association, by the end of 201/kloc-0, the number of China Beidou-1 terminals was 654.38+10,000, with only 50-60 participating enterprises, with an annual output value of about 300-400 million yuan. The total sales volume of GPS navigation terminal 20 1 1 exceeded 45 million units, with an output value of nearly 70 billion yuan and more than 6,800 participating enterprises.