Functional Assisted GPS Receiver Testing
应用文章
Assisted GPS (A-GPS) is an enhanced position location method that uses the satellite-based global positioning system (GPS). A-GPS allows much faster position location by using more precise positioning information obtained from base stations that monitor GPS satellites constantly. This information is called Assistance Data and allows the mobile to determine and report back to the network its exact location within seconds as opposed to minutes using unassisted GPS techniques. Its development was driven by the U.S. Federal Communication Commission (FCC) E911 requirement for quickly providing the location of a cell phone to emergency call dispatchers. In addition to emergency-related position location, more mobile device applications are emerging that use GPS technology. Some examples are mapping, voice navigation, etc. More service providers around the world are implementing A-GPS in their networks to meet emergency and customer-convenience needs. As a result, more A-GPS capable devices are being introduced into the marketplace. It is important to service providers that A-GPS operation does not interfere with cellular phone calls, especially emergency calls. As a result, service providers require their mobile phone suppliers provide proof of correct operation prior to accepting these phones on their networks.