The effective shielding radius of cell phone jammer

Use the cell phone at times and try to call the local free phone or fixed-line telephone to check whether cell phone jammer acts or not.
Positioning accuracy.First, the indoor positioning problem is still not satisfactorily resolved. In addition, AGPS positioning must be achieved through multiple network, this operator is considered taking up a lot of air resources. AGPS main problem is that the user location service for mobile phones must be replaced unacceptable.Currently, the U.S., Japan and Korea, a major manufacturer of mobile terminal 50 has been launched to support a variety of mobile phones and terminals GPSONE technology. Operators have also introduced a variety of location-based services, including child protection, personal navigation applications, look for Friends of the service, sales force management, asset tracking services.
The latter due to simple data processing, the conditions required for the positioning of the low, there is no ambiguity of the problem, you can easily achieve real-time location, which has been widely in civilian promotion. Base station location positioning accuracy on the one hand and the use of positioning technology, and the other to provide services also depends on the external environment, including radio propagation environment, the density of base stations and the location and orientation of the used equipment, such as the U.S. launch of the positioning accuracy in the FCC 50 m. The probability of 67%, positioning accuracy within 150 meters of the probability of 95%. As a result of the GPS positioning satellites from outer space out of the signal, the signal is very weak, and therefore in the room, basement, tunnels and other places, not the normal position.In short, GPS navigation is a mature, basic and reliable system.With the rise of GPS handsets, gpsOne particularly significant application of this technology, our privacy is worth worrying them. Separate GPS mobile phone, users can turn off the GPS terminal, a special channel to prevent the disclosure of personal location. The effective shielding radius of cell phone jammer will be measured from the near to the distant starting from installation position of cell phone jammer .
The GSM positioning and gpsOne technology, operators can always control the location information of each person, as long as the power user, there is the possibility of positioning. More realistic is that the interests of operators is likely to introduce users to each other locate functions, of course, they will set a threshold, such as restrictions on positioning must be positioned so that people know; However, here there is a moral circle: if the wife to be you, you dare not to set it openly? If you did not do anything bad about what you are guilty? More, as long as the phone is positioned to take to send a specific message, later to be positioned to not receive notifications.