New Projector from Jimi Electronic.

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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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A new architecture for alarm/access control systems begin to emerge in the near future. Unlike existing alarm/access control system architectures that wire a number of field devices from doors and alarms back to a closet where there is an alarm/access control panel, expect to see a new architecture in which each door may be served by its own individual controller, locally at the door. This has taken place. This allows for the connection of one or two card readers, door position switch, request-to-exit device, low-power door lock, one or two digital cameras, and a digital intercom (on Ethernet connections) all on the microcontroller. Digital integrated Wireless Security Camera System often interface to legacy analog systems. Legacy access card technologies present a simple challenge. TWIC cards are a good way to migrate from older cards to newer ones. Interfacing multiple access control systems requires an alarm management system that can receive signals from multiple other system...
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