Category: GPS Jammers

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. With LandAirSea GPS systems, it does not only records position, but also velocity, duration of object remains stationary, direction etc.

How does a GPS Tracker Working

Recognise a GPS Tracker

GPS tracking units come in many shapes and sizes some as little as a match box with a magnetic mounting or Velcro attachment system, they do not have to be put into the car. They can actually be placed outside the car in seconds and actively start to record all movements, because the system is GPS based it is very hard to detect and often the units will have very low power consumption allowing them to operate for a few weeks or be hard wired into a vehicle to become an permanent tracking device.

GPS Tracker for Vehicle

GPS Tracker for Pet

Micro GPS Tracker

A Brief Explanation of GPS Navigation

What is an in-vehicle navigation system? A simple definition is an electronic device installed in a vehicle that provides turn-by turn directions – via voice or electronic map – to a specified location. However, not all navigation systems are the same. Manufacturers have different tactics in building products to provide the necessary instructions for these products to be helpful and effective, they must be precise and work in real time. Even more importantly, these devices must be safe to use and not deter the driver’s attention from the road.

Today’s navigation systems are more complex and much more advanced, using not only satellites, but also other technologies such as high-speed processing from DVD or harddrive technology, gyros and information from the vehicle’s electronics (speed pulse). Navigation systems take the information gathered from the satellites (location based on longitude and latitude), length of travel (speed pulse) and travel direction (gyro) to properly place the vehicle in an electronic map. The system then determines what road traveled, and instructs the user with voice prompts and (or) a highlighted route.

System Types

In Dash Mounted System – This format requires replacing the factory in dash radio with the navigation unit and LCD monitor that also functions as the radio and CD player. If the factory audio system is equipped with other factory integrated options (steering wheel radio controls, OnStar, audio amplifiers, door chime modules, etc.) additional parts and labor may be required or some factory features may be lost. This type of system usually has the best appearance in the vehicle. Depending on the manufacturer input information is done by either Touch Screen or remote control.

Surface Mount System – This format typically has the LCD monitor mounted on the dash area or center console of the vehicle (sometimes the monitor can be custom mounted in the dash without altering the factory audio system depending on the vehicle). Monitor placement is the biggest challenge due to the dashboard configuration, air bag location, drinkcup holders, glove box door and the passengers left leg. Depending on the manufacturer input information is done by either Touch Screen or remote control.

The GPS Data Logger is a discreet vehicle tracking device which records the vehicles activities including speed, route and the duration/location of stops. The GPS Data Logger incorporates an internal motion detector to turn off the unit if the vehicle is vibration free for 5 minutes. This enables the system to operate for extended periods of time on minimal battery power.

The GPS Data Logger includes: GPS Unit and Antenna, Serial Cable and GPS Software.

The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or setup charges to use GPS.

How GPS works?
Global Positioning System satellites transmit signals to equipment on the ground. GPS receivers passively receive satellite signals; they do not transmit. GPS receivers require an unobstructed view of the sky, so they are used only outdoors and they often do not perform well within forested areas or near tall buildings. GPS operations depend on a very accurate time reference, which is provided by atomic clocks at the U.S. Naval Observatory. Each GPS satellite has atomic clocks on board.

Each GPS satellite transmits data that indicates its location and the current time. All GPS satellites synchronize operations so that these repeating signals are transmitted at the same instant. The signals, moving at the speed of light, arrive at a GPS receiver at slightly different times because some satellites are farther away than others. The distance to the GPS satellites can be determined by estimating the amount of time it takes for their signals to reach the receiver. When the receiver estimates the distance to at least four GPS satellites, it can calculate its position in three dimensions.

There are at least 24 operational GPS satellites at all times. The satellites, operated by the U.S. Air Force, orbit with a period of 12 hours. Ground stations are used to precisely track each satellite’s orbit.

Determining Position?

A GPS receiver “knows” the location of the satellites, because that information is included in satellite transmissions. By estimating how far away a satellite is, the receiver also “knows” it is located somewhere on the surface of an imaginary sphere centered at the satellite. It then determines the sizes of several spheres, one for each satellite. The receiver is located where these spheres intersect.

How accurate is GPS?

GPS answers five questions simultaneously:
“Where am I?”
“Where am I going?”
“Where are you?”
“What’s the best way to get there?”
” When will I get there?”

GPS is the only system today that can show your exact position on the Earth anytime, in any weather, no matter where you are!

The accuracy of a position determined with GPS depends on the type of receiver. Most hand-held GPS units have about 10-20 meter accuracy. Other types of receivers use a method called Differential GPS (DGPS) to obtain much higher accuracy. DGPS requires an additional receiver fixed at a known location nearby. Observations made by the stationary receiver are used to correct positions recorded by the roving units, producing an accuracy greater than 1 meter.

When the system was created, timing errors were inserted into GPS transmissions to limit the accuracy of non-military GPS receivers to about 100 meters. This part of GPS operations, called Selective Availability, was eliminated in May 2000.

GPS Development:

GPS was designed by the U. S. military. The concept started in the late ’60s but the first satellite wasn’t launched until February 1978. In 1989 the Magellan Corp. introduced the first hand-held GPS receiver. In 1992 GPS was used in Operation Desert Storm. On March 1996 the President decided to make GPS free for civilian users.

GPS System Description:

GPS has three segments:

The space segment now consists of 28 satellites, each in its own orbit about 11,000 nautical miles above the Earth.

The user segment consists of receivers, which you can hold in your hand or mount in your car.

The control segment consists of ground stations (five of them, located around the world) that make sure the satellites are working properly.
segments of gps system
GPS for Civilian Use
At first, the military did not want to let civilians use GPS, fearing that smugglers, terrorists, or hostile forces would use it. Finally, bowing to pressure from the companies that built the equipment, The Defense Department made GPS available for non-military purposes, with some restrictions. On May 1, 2000, President Clinton lifted the restrictions, and announced that the option to degrade civil GPS signals during emergencies would be phased out by 2010. The federal government is committed to providing GPS technology for peaceful uses on a worldwide basis, free of charge.