GPS knowledge--GPS and GPSONE technology
GPSONE technology based on CDMA network
In mobile communications networks, usually has the following location: one is based on Cell ID positioning technology, which consists of access to the network user's current base station Cell information to obtain the current location of the user, its accuracy depends on the size of the mobile base station distribution and coverage; Second, positioning technology based on AFLT, AFLT (Advanced Forward Link Trilateration) is unique in the CDMA technology, when the location, phone/pilot information terminals at the same time listen to multiple base stations, using chip-Shi Yanlai determined the distance to a nearby base station, using triangulation to calculate the specific location; Three are based AGPS (wireless network-assisted GPS positioning technology) positioning technology, AGPS would terminals work simplification, coordination by the network location server and Terminal completed location work, that is satellite scanning and positioning operations most heavy work such as transfer from the Terminal side to side of the network location server.
GPSONE is United States positioning technology developed by Qualcomm for location based business, Client/Server. Wireless assisted AGPS and advanced forward link AFLT triangulation combining two technology for high speed, high availability, and high precision positioning. In environments that are unable to use these two technologies, GPSONE can automatically switch to a Cell ID sector positioning, ensure locating success rate.
Wide area GPS satellite reference network consists of multiple high-sensitivity GPS receiver, is responsible for monitoring around the clock coverage over all of GPS satellite ephemeris data, using music to locate the required information such as frequency shifting, dynamically refresh stored in the GPS satellite positioning platform database (corresponding to the location of satellite data). Terminal only when you need to locate wireless network to inform the location platform location (which base station) and then positioning platform for GPS satellite information, thereby significantly reducing satellite capture time, a significant reduction in power consumption.
Using powerful computational ability to locate servers, complex algorithms can be used to reduce the intensity of the received signal adverse factors to improve positioning accuracy and sensitivity. Location platform latitude and longitude information to application service platform, application or navigate through the wireless network back to the Terminal to meet.
Traditional GPS and GPSONE analysis
Traditional GPS technology relies too heavily on Terminal performance, satellite scan, capture, pseudo signal reception and calculation set to Terminal a, resulting in a position of low sensitivity and end power deficiencies. GPSONE technology will terminals work simplification, satellites scanning and positioning operations most heavy work such as transfer from the Terminal side to side of the network location server. Improved terminal positioning accuracy, sensitivity and speed, cold start decreasing power consumption.
GPS satellite signals and wireless network signal is not a separate position situations, GPSONE system combines these two sources of information, as long as there is a satellite positioning and a community site can be completed, solved the problem of traditional GPS cannot solve. GPSONE system infrastructure support equipment also provides 20dB higher sensitivity than conventional GPS positioning, improve the performance of the GPSONE hybrid location in the Interior of a modern building deep or complex work downtown, and two traditional programmes in these areas are usually does not work.
GPSONE combined positioning and CDMA wireless network-assisted GPS positioning triangle operations, improved indoor positioning performance. CDMA trigonometric operations location make up for free satellite signals can also finish position, other cellular networks such as GSM/GPRS has a similar positioning technology, but because CDMA is the only network-wide synchronization (via GPS) network, so the higher positioning accuracy.