GPS Tracking System Blog

Have a lot of friends asked me what I use GPS better, I think the following can be used as a reference.
Car GPS navigation systems(GPS-4369BNNN) use 4.3-inch screen, a simple design of the fuselage. At present, this GPS navigation instrument dealer pricing for $176.00 , and donated 2 GB memory card.
GPS-4369BNNN navigation systems using 4.3-inch screen, equipped with wireless Bluetooth.the GPS Navigator 3.0 new trial Kay Lide maps, tips and a speeding e-dog function. And to provide users a map of 2003 a free upgrade services.
But,Georgia recently in the U.S. market GPS4369BNNN Hot. It is understood that the consumers optimistic about it one of the reasons is the volume of external control functions, which the United States and Georgia GPS4369BNNN Unlike other GPS products, although only a small improvement, but is more humane. Because in the process of moving only need to touch Waibing can control the volume.As a function of the GPS navigation products, the U.S. grid in the details of the GPS4369BNNN is worth considering to follow.
The reason why the volume control was optimistic about the user, but also the geopolitical situation that could be.This seemingly simple function of the volume of external control, in fact, tantamount to driving safety provided a lot of protection, not from the system settings control the volume, in the pages of any state, as long as the touch screen, they can easily get.the United States and Georgia GPS4369BNNN a more humane it is the function of reversing the rearview mirror, users in the car can be very clear on the whole concept behind the car all the circumstances, the new owners of the road, this is resolved A very practical question, to avoid the car of Guaceng.
U.S. grid GS43117 thin body supported by the classic elegance of black and decorative strips lines, showing that the extraordinary business temperament.

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A vehicle tracking system is an electronic device installed in a vehicle to enable the owner or a third party to track the vehicle’s location. Most modern vehicle tracking systems use Global Positioning System (GPS) modules for accurate location of the vehicle. Many systems also combine a communications component such as cellular or satellite transmitters to communicate the vehicle’s location to a remote user. Vehicle information can be viewed on electronic maps via the Internet or specialized software.

Current vehicle tracking systems have their roots in the shipping industry. Corporations with large fleets of vehicles required some sort of system to determine where each vehicle was at any given time. Vehicle tracking systems can now also be found in consumers vehicles as a theft prevention and retrieval device. Police can follow the signal emitted by the tracking system to locate a stolen vehicle, called stolen vehicle tracking (SVT).

Many GPS vehicle tracking systems now use, or are a form of automatic vehicle location (AVL), to allow for easy location of the vehicle. The GPS satellite system was built and is maintained by government and is available at no cost to civilians. This makes this technology very inexpensive. Other AVL systems do not require the antenna to be in direct line of sight with the sky. Terrestrial based systems such as LORAN and LoJack tracking units use radio frequency (RF) transmitters which will transmit through walls, garages, or buildings. Many police cruisers around the world have a form of AVL tracking as standard equipment in their vehicles. Systems like such as GPS Services are using GSM/GPRS nework for data transfer to the center.

Some vehicle tracking systems charge the user a monthly subscription for a bundle that includes mapping software, hardware, installation, and tracking service. Other companies offer units that are paid for upon installation and will continue to work for the life of the vehicle. The decision to adopt an active technology based on RF (e.g. LORAN), satellite or public carrier (e.g., CDMA) is driven by the quantity of information, the frequency of updates, and the physical environment of the device. For example a fleet manager may want 5 minute updates, telling whether a vehicle is on or off, or may want 30 second updates tracking engine vitals, brake status, container status, vehicle speed and direction and so on.

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A GPS tracking unit is a device that uses the Global Positioning System to determine the precise location of a vehicle, person, or other asset to which it is attached and to record the position of the asset at regular intervals. The recorded location data can be stored within the tracking unit, or it may be transmitted to a central location data base, or internet-connected computer, using a cellular (GPRS), radio, or satellite modem embedded in the unit. This allows the asset’s location to be displayed against a map backdrop either in real-time or when analysing the track later, using customized software. Such systems are not new; amateur radio operators have been operating their free GPS-based nationwide realtime Automatic Packet Reporting System (APRS) since 1982.

A GPS receiver calculates its position by carefully timing the signals sent by the constellation of GPS satellites high above the Earth. Each satellite continually transmits messages containing the time the message was sent, a precise orbit for the satellite sending the message (the ephemeris), and the general system health and rough orbits of all GPS satellites (the almanac). These signals travel at the speed of light (which varies between vacuum and the atmosphere). The receiver uses the arrival time of each message to measure the distance to each satellite, from which it determines the position of the receiver (conceptually the intersection of spheres – see trilateration[5]). The resulting coordinates are converted to more user-friendly forms such as latitude and longitude, or location on a map, then displayed to the user.

It might seem that three satellites would be enough to solve for a position, since space has three dimensions. However, a three-satellite solution requires the time be known to a nanosecond or so, far better than any non-laboratory clock can provide. Using four or more satellites allows the receiver to solve for time as well as geographical position, eliminating the need for a very accurate clock. In other words, the receiver uses four measurements to solve for four variables: x, y, z, and t. While most GPS applications use the computed location and not the (very accurate) computed time, the time is used in some GPS applications such as time transfer and traffic signal timing.

Although four satellites are required for normal operation, fewer may be needed in some special cases. If one variable is already known (for example, a ship or plane may already know its altitude), a receiver can determine its position using only three satellites. Some GPS receivers may use additional clues or assumptions (such as re-using the last known altitude, dead reckoning, inertial navigation, or including information from the vehicle computer) to give degraded answers when fewer than four satellites are visible.

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