秘传
发表于 2025-3-23 13:46:32
Introduction,e capable devices, have opened the door for location-aware applications to permeate all aspects of everyday life. Location is at the core of a number of high-value applications including emergency response, navigation, asset tracking, ground surveying, and many others. The market for GPS products an
暗讽
发表于 2025-3-23 16:00:59
The Global Positioning System,uding, shipping, street navigation, recreational boating, ground surveying, and many more. The market for GPS products and services was estimated at 15 billion euros in 2001 and is expected to grow to 140 billion euros by 2015 . It is estimated that by 2020, the number of GPS chipsets will appr
诱使
发表于 2025-3-23 21:49:37
Infrared and Ultrasonic Systems, light and sound have very different properties. What they have in common, however, is that while they move freely in open space, light and sound are both largely blocked by the materials such as walls, curtains, and partitions that humans use to define the borders of their living spaces. This makes
NAG
发表于 2025-3-24 00:42:10
Location Estimation With 802.11, all of these systems work the same way: 802.11 radios and their supporting drivers allow a device to scan for nearby 802.11 access points (APs). Regardless of the variant of 802.11 (a, b, g, n) or whether encryption is enabled, these scans return a list of the nearby APs and their unique IDs called
spondylosis
发表于 2025-3-24 03:26:19
Cellular-Based Systems,nd its European Community counterpart E112 to locate mobile phone calls to assist in the delivery of emergency services. In addition, the wide adoption and ubiquitous connectivity of cellular phones makes them tempting platforms for the delivery of location-based services, such as advertising, recom
Affectation
发表于 2025-3-24 07:21:42
Other Approaches,e location technologies we have described thus far vary in cost, coverage, and accuracy, all are used in commercial location systems, and all have reached wide-scale adoption in one or more application niches. There are, however, many other location technologies that have not gotten beyond the resea
愤慨点吧
发表于 2025-3-24 13:50:34
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acrophobia
发表于 2025-3-24 16:34:18
Location-Based Applications and Services,al meet-ups, in which location-aware devices are used. We describe both emerging and well-established applications that make use of nearly all of the location technologies we have described thus far. It will be apparent, however, that GPS is used in a far wider variety of applications than any other
ORBIT
发表于 2025-3-24 23:02:56
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射手座
发表于 2025-3-24 23:43:28
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