JIMI Electronic

There are several key differences between DVRs and VCRs that result in significant advantages for DVR users. The most notable difference between the DVR and VCR is the medium used for recording the video images. VCRs record images on magnetic tapes, while digital systems use HD drives, DATs or DVDs. This differentiation has significant implications in terms of the video image quality, speed of information retrieval, image transmission speed, and remote monitoring capabilities. Digital video systems using DVRs can be accessed over LAN, intranets, and the Internet. This permits security personnel to monitor remote sites across the street, town, or locations hundreds or thousands miles away. Using an Internet browser or other application software on any PC or laptop allows security with personnel or corporate management to view recorded digital video images at a secure IP (Internet protocol) address from anywhere in the world. Security systems using  Smart DVR  can play a ...

Published in 1948, George Orwell’s novel Nineteen Eighty-Four told the story of a society in which people’s words and actions were constantly monitored by the state. Written as a warning against the repression of totalitarian societies, the scenario seemed very unlikely in mid-Twentieth century Britain. However, by the early Twenty first century at least one of its premises has become reality. Almost anywhere you go in public today, your actions are likely to be monitored via closed circuit television (CCTV). The use of CCTV in public places has become almost universal, not to mention many private places too. But unlike Orwell’s novel, it is not a case of a totalitarian government seeking to monitor your every word and deed for political control. The use of CCTV by governments is a response to demands to cut rising crime rates.  mirror CAM  are used chiefly in public places such as railway stations, car parks, in and around public buildings and centres of nightlife and sh...

Powering Your GPS Receiver GPS receivers that are advertised as waterproof typically comply with the IEC (European Community Specification) Standard 529 IPX7. This standard states a device can be immersed in up to one meter (a little over three feet) of water for up to 30 minutes before failing. You can count on all handheld GPS receivers to be weatherproof (moisture-resistant), but if I’m doing an activity where my waterproof IPX7 GPS receiver might end up taking a dunking, I carry it in waterproof bag that floats just for added security.   After considering all the options, making your list, checking it twice, and finding out which GPS receivers are naughty and nice, you’ve finally come to that blessed event where you’re the proud owner of a GPS receiver. But before you step out the door for a 100-mile wilderness trek or cross-country road trip, intent on relying on your new electronic gadget as a guide, be sure spend some time getting to know your GPS receiver. A good p...

Many security consultants and security firms are hired to advise taxi companies on methods to help themselves. Situational crimeprevention measures, such as partitions between drivers and passengers, video cameras, and  GPS rearview mirror  , are possible solutions that can reduce the risk to drivers. The most recent statistics from the U.S. Bureau of Labor Statistics reported that cab drivers are ten times more likely to be killed on the job than the average worker. The use of electronic video surveillance (surveillance and security cameras and closed-circuit television (CCTV) systems) has increased rapidly in both the private security industry and law enforcement. Electronic video surveillance systems can passively record and play back video at certain intervals, be actively monitored by security personnel, or be used in a combination of these methods. Some evidence suggests that video surveillance is successful in reducing and preventing crimes and is helpful in prosecutin...

NRL collects the GPS data along with the laser tracking data for inter comparison studies. Tracking data from the GPS Control Segment stations, USNO, the broadcast position data and DMA precise ephemerides are collected. These are continuous data over the in~rbit operation of the satellites. To utilize the GPS derived tracking data for inter comparison with the laser derived data, the local clocks at the GPS Monitor Station sites must be accounted for since they are the basis for the GPS tracking measurements. In GPS itself these clocks are accounted for by the use of GPS Time which is a common synchronization time computed at the MCS. However, the GPS ranging measurements are directly related to the local clocks whose performance must be removed if the satellite clock is to be isolated from the satellite orbital position and evaluated. The laser data is independent of this influence on ranging measurements since the local clock is used for time tagging. To determine the performan...

With the development of navigation systems, the demand for map data has grown massively. Cars with a large number of sensors and 360 degree photographic - or even laser-capturing capabilities, drive around cities to digitize the world. Accordingly, existing markets have to adapt to this new technology. In the real-estate business, data is collected for every building: photographs, ground plans, etc. Something on the order of a million in-car GPS navigation systems are being installed each year (  rear-view mirror car dvr camera ,  rearview mirror navigation  ). Not only do these systems allow navigation based on the static facts of where the roads go but also on the dynamic facts relating to where the other traffic is. Tokyo will soon benefit from such a system. In addition to vehicle route guidance, intelligent transportation systems (ITS) will provide other benefits, such as fleet vehicle dispatch and tracking, and emergency notification of police and tow trucks. Befor...

GPS was designed to work outdoors. The signal from the GPS satellites is extremely weak, and the satellites are far away. The total radiated power from each satellite is just 27W, about the same power from a dim lightbulb. The satellites are more than 20,000-km high (about 55 times higher than the space shuttle flies). When the signal reaches the GPS receiver on the Earth, the received signal power is about 100 attowatts; “atto” means 10–18, and it is not a commonly used prefix. We typically express such low powers in terms of decibels. But it is useful to mention the attowatt just this once, to get a feel for how weak the received GPS signal really is. The received signal power is 100 attowatts when the receiver is outdoors; when the receiver moves indoors, the signals rapidly get weaker, by 10–100 times in a house, and by 100–1,000 times or more in a large building. However, it is not just indoors where  electronic tracking devices  has signal problems; the weak signal is a...

To map or not to map In terms of features, probably the biggest decision you’ll need to make is whether to get a GPS receiver that displays maps. If you plan to use your GPS receiver for on-the-road navigation, you need a mapping model. If you’re primarily using your GPS receiver for outdoor activities, you need to decide whether to spend the extra money and get a model that displays maps. Quite honestly, no matter what a salesperson might tell you, a GPS receiver with built-in maps isn’t required for activities such as hiking, geocaching, fishing, bird watching, kayaking, or other outdoor pursuits. Using waypoints and tracks are all you need to navigate and successfully stay found. (Of course, you have a paper map and compass with you, and know how to use them, right?) Even though your GPS receiver doesn’t display maps, if it can interface with a PC, you can still download information on where you’ve been and have it show up in a digital mapping program. That said, mapping GPS re...

Information collection is a new traffic flow information collection technology developed with ITS. To ensure the operation safety and scheduling efficiency of the floating cars, GPS devices are equipped. These devices send the status information of the vehicles to the management centre as certain frequency. This information records into log files, which contain the trajectories of the vehicles. Through vehicle trajectory analysis, not only improve the scheduling efficiency of the taxi dispatch system, but also provide road traffic conditions for the relevant departments, give them the decision support of traffic control. The obtaining of real-time traffic information has become an important part of the Intelligent Transportation Systems (ITS). With the key technologies development of ITS, it’s possible to offer real-time, dynamic and predicted traffic information for travellers by information collection, processing and analysis. The major difference between one GPS device and another ...

More than 35 years have passed since some of us were fortunate enough to play a role in the design of GPS. Predecessor systems and designs, such as Transit, Timation, 621B, DNSS, and atomic clocks provided some of its foundations. Considered at first by some as a useless adventure of some technologists with little knowledge of real navigation, GPS has now become a household word and has many millions of users, mostly civilian, in aircraft, ships, surveying, construction, and most of all, cell phones and automobiles ( such as  rearview mirror GPS ,  mirror GPS  ). Assisted GPS (A-GPS) is one of the major contributors to the widespread use of GPS, especially for cell phones and other handheld units. A-GPS integrates GPS and communications, especially wireless and utilizes GPS chips with added low-cost processing power and many thousands of correlators. GPS satellites are limited in the amount of power they can provide to users on the ground many thousands of miles away. A-...

The combination of the Internet and the DVR has resulted in devices that permit localized, home-based video content—including content recorded on DVRs—to be conveyed just about anywhere around the world for viewing from distant locations. On what is almost entirely the business side of DVR usage, DVRs are highly prized for their ability to efficiently and relatively cheaply store and manipulate content that can later be used to assess employees’, customers’, and others’ actions within a store, factory, or similar commercial environments. DVRs in these instances are utilized because they can do a lot to satisfy the needs of their users. For example, a DVR can be equipped with numerous tuning heads, allowing numerous video feeds from numerous camera locations to be recorded on the same DVR unit simultaneously for later playback and review.  Rearview Mirror DVR  can also be set-up inside moving vehicles, such as police cars and busses, to permit viewing and permanent recording o...

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...