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How GPS tracker work - Time is of the Essence

Декабрь 25th, 2015 by homesecuirtycameras and tagged , ,

With progressive development in technology in recent years, one can relish the prime advantages of the various innovative software solutions such as field service tracking software. A lot of operational costs can be reduced using this software to improve the ROI. From various records, it is also proven that many industries have saved up to 30% using the field service tracking system. The best thing about using this software is that, it can be accessed from computers, smart phones or tablets. In addition to these types of GPS receivers, larger and less portable models are used in airplanes, boats, and commercial vehicles. The U.S. government and military uses restricted-use GPS units, and expensive receivers are used for surveying. Although some of these vehicle GPS tracking devices are discussed briefly, don’t expect to find out as much about them as the land and auto consumer models. I tell you what questions to ask when selecting a GPS receiver and give you some hints on which features are best for different activities. You can apply these questions and selection criteria to pretty much any GPS 3G tracker for Car to pick the right model for you.

In a conventional Personal GPS tracker the information, such as carrier frequency and initial C/A code phase obtained from the acquisition, can be used to track a signal. The navigation data phase transition can be found through the tracking program. For a weak signal it is difficult to determine the exact location of the navigation data transition from the tracking program. In order to process the data efficiently, the exact location of the navigation data phase transition is needed such that one can start to process the data every 20 ms. Thus in this section the determination of the location of the navigation phase transition is discussed. In general, it is easier to determine whether there is an existence of data transition than to determine the exact location of a data transition.

Even though the vehicle GPS tracking device knows the precise location of the satellites in space, it still needs to know how far away the satellites are (the distance)so it can determine its position on Earth. There is a simple formula that tells the receiver how far the satellites are (the distance)so it can determine its position on Earth.  There is a simple formula that tells the receiver how far it is from each satellite:Your distance from a given satellite object equals the velocity of the transmitted signal multiplied by the time it takes the signal to reach you (Velocity x Travel Time = Distance).

The satellites orbit at an altitude of approximately 20,200 kilometers, or about half the altitude of a geostationary satellite. A geostationary satellite, orbiting at about 40,000 kilometers altitude, circles the Earth every 24 hours, the same time period that the Earth takes to complete one full rotation (one day). Therefore, a geostationary satellite always remains over the same spot on the Earth (thus “geostationary”), essentially following that “spot” on the surface as the Earth rotates. The GPS satellites, at one-half that altitude, complete one orbit every 11 hours, 58 minutes (its “orbital period”). Since the Earth is rotating underneath the orbiting satellites, any given satellite’s orbit slowly “moves” slightly westward with each rotation.

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