Jimi Electronic- Professional Wireless Smart Devices

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GPS Solution - About Real-Time Base Station

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Since GPS signal errors tend to be quite similar over wide geographic areas, there are obvious advantages to having a single base station serve for any roving stations in that area. Put another way, one can think of very few, if any, reasons for each of 28 GPS users, who are in reasonably close proximity to each other, to collect and rebroadcast identical correction data. This obvious fact, plus the entrepreneurial nature of American society, has produced GPS differential correction services, wherein a user contracts for equipment and the right to receive corrections to the raw GPS signal. Users who are sufficiently close to a U.S. Coast Guard GPS beacon may pick up a signal at no cost besides that of the receiving equipment. Such stations are sometimes referred to as Continually Operating Reference Stations, CORS. The problem with “centrally located” base stations is that there may not be a signal from one where you are trying to take data. While there are more and more base stat...
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GPS tracker-based positioning solutions

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Enhanced client-assisted GPS positioning The enhanced client-assisted GPS positioning technique is a hybrid between autonomous GPS and server-assisted GPS. This type of solution is similar to the serverassisted GPS, with the location server providing the mobile unit with a list of visible satellites on demand. However, in an enhanced client-assisted system, the mobile unit does the complete PVT calculation rather than sending pseudorange information back to the location server. This technique essentially requires the same processing power and capabilities as an autonomous  GPS solution , in addition to a communication link between the mobile unit and the location server. However, the amount of time required to complete the PVT calculation is much less than with an autonomous GPS solution, because of the satellite view information provided by the location server, and fewer exchanges with the location server are required than with a server-assisted solution. Dead reckoning ...
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GPS Phone Positioning And Tracking

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Applications requiring positioning in mobile networks have gained importance in recent years. Examples include not only LBSs, but also enhanced emergency call services such as the North American E911 and the newly defined Emergency Call (eCall), which is planned to become a European standard as part of the eSafety initiative of the European commission. Mobile network providers already offer LBSs along with positioning, although the accuracy and reliability of the present techniques do not yet meet the requirements of such services in all cases. One of the most popular positioning systems in navigation is the GPS tracker , which is satellite based, widely available and quite accurate, as long as the receiver to be localized and the satellites have an LOS connection. Since most common mobile phones do not support the GPS, network providers evaluate the position of the network’s base stations (BSs) which have connections to the mobile stations (MSs) to be located. The accuracy of the pr...
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