In modern society, people's demand for positioning technology can be reflected in all aspects of life. Sometimes, it can even play a key role in saving human life. As a new positioning technology, GPSONE has many advantages compared with traditional GPS technology, which can greatly improve the quality of positioning services.
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With the development of society and the advancement of science and technology, people's activities are becoming more and more uncertain and increasingly uncertain. The most notable feature of mobile communications is the movement of locations, which naturally leads to some location-related service requirements. Today, with the rapid development of mobile communication, mobile communication users can not only know where they are by this technology, but also extend to what they are interested in (or places). , or someone else wants to know where the mover (or moving object) is, and so on.
On February 27, 2002, the Texas police officer MikePrivitt's car turned over on an icy road. He was dizzy and overwhelmed. Only a few minutes after he called 911 for emergency help, the emergency personnel successfully found him. It was the GPSONE chip installed in the mobile phone that automatically sent his distressed location to the rescuer when he called 911 for help. On the same morning, a bag of $10 billion worth of jewels escorted by jewelry store staff in Tokyo, Japan was stolen on the train. Only one hour after the incident, the police tracked the stolen jewels 12 kilometers from the train. Originally, logistics companies have used GPSONE technology to track the whereabouts of items.
Location-based services (LBS), also known as location-based services, refer to the movement of mobile terminals and mobile networks to determine the actual geographic location of mobile users, thereby providing a type of mobile-related service information that users need. A form of service that combines communication and navigation. The location service business has been regarded by the industry as another killer-level data service after SMS, and its development momentum in Japan and Korea is the strongest. In China, mobile companies and China Unicom have also launched location services, and the location services business is growing rapidly in China.
Traditional GPS technology
GPS English full name is "Navigation Satellite Timing And Ranging / Global Position System", which means "satellite time measurement ranging navigation / global positioning system", referred to as GPS system. The system is a satellite-based radio navigation and positioning system.
The GPS global satellite positioning navigation system was initially used only for military purposes, and later converted to civilian use is widely used in business and scientific research. The GPS space uses a constellation of twenty-four satellites. The height of the satellite is about 20,200 kilometers. It is distributed on the orbital planes of six ascending points separated by 60 degrees. Each satellite is evenly distributed on four orbits. The satellites are separated by 40 degrees, allowing four satellites to be seen at least simultaneously anywhere on the planet.
The traditional GPS positioning technology works well in the outdoor, but it is not effective in indoors or where satellite signals cannot be covered, and if there are no more than three satellites in the location, the system cannot be positioned from the cold start state.
GPSONE technology based on CDMA network
In the mobile communication network, there are usually the following positioning technologies: First, the Cell ID-based positioning technology, which acquires the cell information of the base station where the user is currently located to obtain the current location of the user, and the accuracy depends on the distribution of the mobile base station. The size of the coverage; Second, the AFLT-based positioning technology, AFLT (Advanced Forward Link Trilateration) is a unique technology of CDMA. During the positioning operation, the mobile phone/terminal simultaneously monitors the pilot information of multiple base stations, using chip delay. To determine the distance to the nearby base station, and finally calculate the specific position by the triangle positioning method (shown in Figure 1); Third, based on AGPS (wireless network-assisted GPS positioning technology) positioning technology, AGPS will simplify the work of the terminal, by the network side The positioning server and the terminal work together to complete the positioning work, that is, the most arduous work such as satellite scanning and positioning calculation is transferred from the terminal side to the positioning server on the network side (shown in FIG. 2).
Figure 1 Schematic diagram of AFLT structure
Figure 2 AGPS structure diagram
GPSONE is a positioning technology developed by Qualcomm for location-based services, using Client/Server. It combines wireless assisted AGPS and advanced forward link AFLT triangulation to achieve high precision, high availability and high speed positioning. In an environment where neither of the two positioning technologies can be used, GPSONE will automatically switch to the Cell ID sector positioning mode to ensure the positioning success rate (shown in Figure 3).
Figure 3 Schematic diagram of GPSONE
The wide-area GPS satellite reference network is composed of a plurality of high-sensitivity GPS receivers, which are responsible for monitoring all the GPS satellite ephemeris data, Doppler frequency shift and other positioning information over the coverage area, and dynamically refreshing the GPS stored in the positioning platform. Satellite database (satellite data and geographical location correspondence). The terminal only informs the positioning platform of the approximate location (which base station belongs to) through the wireless network when the positioning is needed, and then obtains the GPS satellite information through the positioning platform, thereby greatly shortening the satellite capturing time and greatly reducing the power consumption.
With the powerful computing power of the positioning server, complex positioning algorithms can be used to reduce the influence of weak signals such as weak received signals, thereby improving positioning accuracy and sensitivity. The positioning platform sends the latitude and longitude information to the application service platform, or returns to the terminal through the wireless network to satisfy the positioning application.
Analysis of the advantages and disadvantages of traditional GPS and GPSONE
Due to the excessive dependence on terminal performance, traditional GPS technology integrates satellite scanning, acquisition, pseudorange signal reception and positioning calculations into the terminal, resulting in defects such as low positioning sensitivity and large terminal power consumption. GPSONE technology simplifies the work of the terminal, and transfers the most arduous work such as satellite scanning and positioning calculation from the terminal side to the positioning server on the network side. The positioning accuracy, sensitivity and cold start speed of the terminal are improved, and the power consumption of the terminal is reduced.
In the case that neither the GPS satellite signal nor the wireless network signal can be separately positioned, the GPSONE system combines the two information sources, and as long as there is one satellite and one cell site, the positioning can be completed, solving the problem that the conventional GPS cannot solve. The infrastructure aids of the GPSONE system also provide 20dB higher sensitivity than conventional GPS positioning. The improved performance allows the GPSONE hybrid positioning method to work properly in the interior of modern buildings or between urban buildings. Traditional programs are often not working properly in these places.
GPSONE combines wireless network-assisted GPS positioning and CDMA triangulation positioning to improve indoor positioning. CDMA triangulation positioning can make up for positioning without satellite signal. Other cellular telephone networks such as GSM/GPRS also have similar self-positioning technology, but since CDMA is the only full-network synchronous (via GPS) network, the positioning accuracy is higher.
As of the first half of 2004, a total of 14 operators around the world have adopted GPSONE positioning technology to provide accurate positioning services, including Verizon and Sprint, the first and fourth largest operators in the US, and NTT DoCoMo, the first and second largest operator in Japan. And KDDI, South Korea's first and second largest operators SKT and KTF. There are more than 100 types of terminals, and the terminal sales volume exceeds 50 million.
Since April 2001, Japan introduced the personal security special device using GPSONE, Japan, South Korea and the United States successively launched commercial mobile phones supporting GPSONE positioning function at the end of 2001. At present, the number of GPSONE technology devices put into commercial use in these three countries has exceeded one million. There are more than 15 types of mobile phones with GPSONE positioning functions in the Japanese and Korean markets. Operators also provide a wide range of positioning services based on this, including child safety monitoring, personal navigation applications, and positioning friends. Several operators in the United States are also selling GPSONE phones to meet the Federal Communications Commission's (FCC) mandatory requirements for E911 wireless security calls, and may continue to roll out related positioning services. With the large deployment of CDMA networks in Asia and the United States, GPSONE technology will become the technology of choice for the world's widely used personal mobile phones, vehicle terminals, and special intelligent terminals.
At home, WG4 in the China Wireless Communications Standards Research Group (CWTS) has completed the development of protocol specifications related to location services. China's CDMA1X network has been completed and officially put into commercial use in 2002. After the first, second and third phases of construction, the network scale has been gradually expanded and improved, and has become a mature and stable network.
In China, the positioning service named after the GPSONE positioning star has significantly improved compared with the traditional GPS because of its scope of use, positioning accuracy, positioning sensitivity, terminal power consumption and startup speed, and it has also entered people's sight. Unicom's GPSONE positioning service has more than 30 GPSONE terminals available, including special terminals for the elderly and children (Caring Star), and various applications are emerging. The impact will be broad, such as increased productivity, increased entertainment, location-based advertising, navigation, mobile resource management, asset management, and geographic information access. In addition, positioning information will directly affect people's habits of going out, such as route selection, early avoidance of traffic jams, handling of accidents, inquiries on unfamiliar roads, selection of stopovers, use of local resources, including fueling Stations, food stores, hotels and taxis. Location information also offers more opportunities for retailers who want to effectively reach potential customers and make targeted promotions. Therefore, China's broad market prospects based on GPSONE location services are unquestionable.
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