May 20, 2012 we have (2016 pdf files in our database)
Short Desciption: Geolocation and Assisted GPS February 2001 123 COMMUNICATIONS urrently in development, numer- ous geolocation technologies can pinpoint a personrsquo;s or ob- jectrsquo;s position on the Earth. Knowledge of the spatial distri- b
Content Inside: Geolocation and Assisted GPS February 2001 123 COMMUNICATIONS urrently in development, numer- ous geolocation technologies can pinpoint a personrsquo;s or ob- jectrsquo;s position on the Earth. Knowledge of the spatial distri- bution of wireless callers will facilitate the planning, design, and operation of next- generation broadband wireless networks. Mobile users will gain the ability to get local traffic information and detailed directions to gas stations, restaurants, hotels, and other services. Police and res- cue teams will be able to quickly and pre- cisely locate people who are lost or injured but cannot give their precise loca- tion. Companies will use geolocation- based applications to track personnel, vehicles, and other assets. The driving force behind the develop- ment of this technology is a US Federal Communications Commission (FCC) mandate stating that by 1 October 2001 all wireless carriers must provide the geolocation of an emergency 911 caller to the appropriate public safety answering point (see http:www.fcc.gove911). Location technologies requiring new, modified, or upgraded mobile stations must determine the callerrsquo;s longitude and latitude within 50 meters for 67 percent of emergency calls, and within 150 meters for 95 percent of the calls. Otherwise, they must do so within 100 meters and 300 meters, respectively, for the same per- centage of calls. Currently deployed wire- less technology can locate 911 calls within an area no smaller than 10 to 15 square kilometers. GLOBAL POSITIONING SYSTEM An obvious way to satisfy the FCC requirement is to incorporate Global GPS GPS stellation of 24 satellites, equally spaced in six orbital planes 20,200 kilometers above the Earth, that transmit two spe- cially coded carrier signals: L1 frequency for civilian use, and L2 for military and government use. GPS compute position in 3Dmdash;latitude, lon- gitude, and altitudemdash;within a radius of 10 meters or better. Accuracy has increased substantially since the US gov- ernment turned off