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Sim service security gsm was designed with a moderate

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SIM Service Security-GSM was designed with a moderate level of servicesecurity.Thesystem was designed to authenticate the subscriber using a pre-shared key andDept of ISE, MSEC2015-16Page 28
AUTOMATIC NOTIFICATION AND EARLY RESCUE DURING AUTOM0TIVE ACCIDENTSchallenge-response. GSM only authenticates the user to the network. GSM usesseveral cryptographic algorithms for security. The system supports multiplealgorithms so operators may replace that cipher with a stronger one.5.1.4 GPSGPS-634R”is a highly integrated smart GPS module with a ceramic GPS patchantenna. The module is with 51 channel acquisition engine and 14 channel trackengine, which is capable of receiving signals from up to 65 GPS satellites andtransferring them into the precise position and timing information that can be readover either UART port or RS232 serial port.Small size and high end GPSfunctionality are at lower power consumption, both of the LVTTL-level andRS232signal interface are provided on the interface connector.POWER SUPPLY:3.6V~6V(InputVoltage), 23mA(Input Current).Fig 5.6: GPS moduleGlobal Positioning System was developed by the United States' Department ofDefense. It uses between 24 and 32 Medium Earth Orbit satellites that transmitprecise microwave signals. This enables GPS receivers to determine their currentlocation, time and velocity. The GPS satellites are maintained by the United States AirForce.GPS is often used by civilians as a navigation system. On the ground, any GPSreceiver contains a computer that "triangulates" its own position by getting bearingsfrom at least three satellites. The result is provided in the form of a geographicDept of ISE, MSEC2015-16Page 29
AUTOMATIC NOTIFICATION AND EARLY RESCUE DURING AUTOM0TIVE ACCIDENTSposition - longitude and latitude - to, for most receivers, within an accuracy of 10 to100 meters. Software applications can then use those coordinates to provide driving orwalking instructions.Fig 5.7:The GPS Satellite SystemGetting a lock on by the GPS receivers on the ground usually takes some timeespecially where the receiver is in a moving vehicle or in dense urban areas. Theinitial time needed for a GPS lock is usually dependent on how the GPS receiverstarts. There are three types of start - hot, warm and cold.Thehot startis when the GPS device remembers its last calculated position andthe satellites in view, the almanac used (information about all the satellites in theconstellation), the UTC Time and makes an attempt to lock onto the same satellitesand calculate a new position based upon the previous information. This is the quickestGPS lock but it only works if you are generally in the same location as you werewhen the GPS was last turned off.Thewarm startis when the GPS device remembers its last calculated position,almanac used, and UTC Time, but not which satellites were in view. It then performsa reset and attempts to obtain the satellite signals and calculates a new position.

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Term
Fall
Professor
professor_unknown
Tags
Global Positioning System

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