Mobile location [1] refers to the specific positioning technology through mobile phones or end-users to obtain location information (latitude and longitude coordinates), the electronic map to locate the object marked is the location of the technology or service. Positioning technology, there are two, one is based on GPS positioning, a mobile operator network is based on the positioning of the base station. GPS-based positioning method is to use the phone?s GPS positioning module to send their signals to locate the position of the background to achieve the orientation of the phone. Base station location is to use the mobile phone base stations measure the distance from the phone to determine the location. Make sure the cell phone is shielded by? cell phone jammer .
The latter does not require phone has GPS positioning capability, but the accuracy depends heavily on the base station the size distribution and coverage, sometimes the error more than one kilometer. The former high positioning accuracy. There are also small-scale use of Wifi in the way of positioning. Mobile location-based services is through the wireless terminal (such as mobile phones, PDA, etc.) and with the wireless network, the mobile user to determine the actual location information (latitude and longitude coordinates of the data), thus providing the user with the desired position and orientation of value-added services. Location-based services, also known as Mobile Location Services (LBS ? Location Based Service), which is moving through the telecom operator?s network (such as the GSM network, CDMA network) for mobile end-user location information (latitude and longitude coordinates), the electronic map platform support services to provide users with a corresponding value-added services. It is better that there is 3G cell phone of three different systems for testing of?cell phone?jammer including China Mobile TD-SCDMA, China Unicom CDMA 2000 and China Telecom WCDMA).
Mobile location services from the United States was first started. Back in 1996, the U.S. Federal Communications Commission (FCC) requires mobile operators to provide emergency services to mobile users, which provides the caller?s location for the timely rescue, they will move the location of this service is named E911. Since then, Japan, Germany, France, Sweden, Finland and other countries have introduced distinctive commercial location services. At present, many countries have enacted laws in the form of requirements for mobile location services, such as the United States, ?US FCC E 911? in the form of law of the operators to provide location services 911 accuracy standards, and the EU also enacted laws , follow the ?US FCC? standard, and in 2003-1-1 implementation. Incidentally, the location-based services has caused people to privacy concerns. Wireless communication companies and regulators must examine the policy allows the user to enter the address information, personal privacy is protected. Here will exhibit the common omnidirectional antenna of?cell phone jammer .
Hi-Tech Mobile GPS positioning satellite unit is available to special needs populations in distress when a key police help, 110,120 ambulance quickly identify the target location, the parents of young and old to walk out the location information, security alarm monitoring positioning of mobile phones, GPS can also be used from mobile phones go to the police on the information received, personal security, family care of the ?portable nanny.? Apply and have robbed the event of difficulties, lost, lost, acute (heart, high blood pressure) burst, the event disaster needs urgent police assistance may be people and children, the elderly, mental retardation or other group to be guardian. Dingweizhixing business network China Unicom CDMA1X GPSONE advanced positioning technology to provide the public with high-precision positioning operations. Positioning accuracy in the outdoor environment as high as 5 meters to 50 meters. At the same time, whether indoors or outdoors, as long as CDMA1X network coverage to locate the place can be realized, and shorten the positioning time. It should be avoided that the antenna of? cell phone jammer? points to the area which is expected to be shielded most.
U-Max Dingweizhixing business based on the positioning of mobile terminals, combined with GIS (geographic information system) map data, can provide users with a wealth of location information services. ?Interactive vision? for the business of China Unicom?s CDMA users with a wireless Internet service, as long as you use more than one browser to support WAP1.2 functions of mobile terminals, such as the LG CU8080, CU8180, CU8280, SAMSUNGX199, SAMSUNGX319, SAMSUNGX339 , Putian SCP550, Putian SCP580, ZTE G218 so you can use this service, its operation is similar to China Mobile?s WAP version of the position. Unicom currently charges for mobile data communication standard is 0.01 yuan / kB. The omnidirectional antenna of? cell phone jammer? will adopts the most convenient direction.
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Source: http://jammerscellphone.com/testing-of-shielding-effect-of-cell-phone-jammer/
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