JIMI Electronic

The most important hardware in a GPS surveying operation are the receivers. Their characteristics and capabilities influence the techniques available to the user throughout the work, from the initial planning to processing. There are literally hundreds of different GPS receivers on the market. Only a portion of that number is appropriate for GPS surveying and they share some fundamental elements. They are generally capable of accuracies from submeter to subcentimeter. They are capable of differential GPS (DPGS), real-time GPS, static GPS, and other hybrid techniques. They usually are accompanied by postprocessing software and network adjustment software. And many are equipped with capacity for extra batteries, external data collectors, external antennas, and tripod mounting hardware. These features, and others, distinguish GPS receivers used in the various aspects of surveying from handheld GPS units designed primarily for recreational use. A GPS receiver, like any electronic tracker...

personal tracking device can utilize location information to potentially provide a safer tracked environment allowing vulnerable people to continue with their daily activities, as much as possible. This paper presents the options for alert escalation. The aim is to provide a safety net, without triggering unnecessary alarms. The escalation procedure involves initial speech alert to the user, then a speech and vibrate alert to the user as a reminder; this is followed by a text message to an identified carer if the user has not re-entered the designated safe zone. Parameters for alert escalation can be tuned to individual circumstances. The user can seek help by getting directions from the current position to home or by calling a carer. We report on a small user evaluation, an essential pre-requisite to testing with the intended cohort. The 21st century has brought an era of global population ageing. This will inevitably lead to an increase in the number of older people with dementia,...

Over the past few years, the electronic tracking device commercial market has grown rapidly. People are using GPS in rental cars, on hiking trips, and in many other recreational activities. Companies have been formed whose business it is to put names on latitude and longitude coordinates. These companies have constructed extensive databases with street names, addresses, business names, points of interest, restaurants, underwater wrecks, and the list goes on. Anything which is stationary is likely to be labelled. All of this extensive data has been put into electronic form so that it can be converted into various computer formats. With this growth in electronic data, blind people no longer need be limited to the small amounts of location information they could previously glean from sighted people. The maps and points of interest are no longer just a drawing on an inaccessible print map. This electronic data can be converted into programs that work on computers designed for blind or v...

Since the introduction of the first consumer GPS receivers in 1995, the metamorphosis of the GPS receiver has been dramatic. The variety of GPS receivers available includes receivers with different connectors (Serial, USB, Compact Flash, etc.), receivers of different sizes (from TV remote size to matchbook size), many different user applications (screens, maps, points of interest files), and so on. So which features are important when constructing a portable tracker for use by Kids? A small sized, lightweight device is important for the accessible GPS package. Durability, price and functionality must be considered when evaluating the tradeoffs with size. Another important issue with GPS receivers is the accuracy reliability. A receiver must work well when there is marginal satellite visibility, for example, in the window of a bus or on the sidewalk close to a tall building. As stated before, the GPS information from the satellites has its limitations, but there are receivers that mo...

With the current technology, tracking and tracing usually requires an additional GPS antenna to determine the precise location, as the position information from the GSM network is too fuzzy to provide accurate location data. Also communication with mobile units is often established by Short Message Service (SMS), with a fixed fee associated with every query. There is no permanent flow of data communications (SMS is not an “always on” service) between the field staff and the base—and every query incurs relevant cost. With the evolvement of 3G networks, there is an expectation of change in the infrastructure or rather; there have already been some changes. 3G will allegedly provide “always on” data communication at high speed, which will enable easy and quick queries at any time, even continuous tracking and tracing. It is also assumed that this service will be at a comparatively lower rate. The major enhancements to be expected from GPS 3G mobile services are directly linked to new k...

Direct communication between vehicles allows information exchange without requiring any fixed infrastructure or base stations. The location and velocity of vehicles is constantly changing, and the RF communication range is of fairly short distance; therefore, the set of vehicles that can directly communicate will constantly change over a short period of time. This dictates that the physical layer and the network must be capable of operating in an ad hoc, decentralized manner, although coordination and synchronization through GPS ( GPS tracker ) time signals are possible. Any two nodes must be able to communicate securely whenever they are within communication range. In a V2V network we can distinguish two modes of communication, usually designated as: • Single hop: Two vehicles are close enough to communicate directly with each other (either broadcast or point to point) with low latency. • Multihop: Vehicles that can not directly communicate may forward messages through interme...