關於gps的英語小短文閱讀
GNSS即全球衛星導航系統，廣泛地應用於定位、授時、導航等諸多民用和軍事領域。GPS系統基於無線電單向測距和CDMA技術實現，在當前諸多衛星導航系統中技術上最具典型性，使用也最爲普遍。小編精心收集了關於gps的英語小短文，供大家欣賞學習!
Motivated by the events of 9/11 2001 and problems with 911 calls from cellular phones, the FCC requires that by the end of 2005 all cell phone carriers must be able to trace the location of cell phone calls to within a range of no more than 100 meters.
Cell phones are already available with GPS technology installed. These systems are not the same as the GPS devices used by hikers, mariners and drivers. Lower cost models do not allow the user to enter data such as mapping software. All systems require a wireless network.
Cell phones with GPS technology use AGPS (Assisted Global Positioning System). Assisted because the system uses both cell phone towers and satellites as location finders.
There are advantages and disadvantages in the new technology. The cost to implement the program will be passed on to consumers -- cell phones will cost more. Privacy is a real concern with the general public especially in this day of identity theft. It is a concern that unknown people will be able to access your location. Also there is a possibility that the spam you are flooded with on your home computer will now be sent to your cell phone.
Using GPS cell phones to track people has some great advantages. Locating kids and family can be a blessing. Remember though, if you try to locate someone who is out of your calling area, you will be charged extra.
The obvious benefit for the consumer is the issue of emergency aid and that was the catalyst for this whole idea of GPS cell phones. A 911 call that can be quickly located, emergency roadside assistance, locating persons missing in remote areas, the list goes on. If coverage is available then GPS cell phones save lives.
Many carriers already have GPS cell phones available. You can buy the basic model for emergency tracking or you can pay for the technology that turns the cell phone into a sophisticated mapping, PDA system. Problems are still an issue with the advanced features. The more you use the advanced features, the greater the drain on the battery. Increasing battery size also increases the cell phone size and that is a problem for most consumers who want ever smaller, lighter devices to carry around. At this time Japan seems to have the edge on developing the high-end miniature GPS cell phone.
Sacrificing privacy for safety is the issue and I suspect that it would only take one positive outcome in an emergency situation to make the decision for you.
As the systems become more and more refined camera and PDA capabilities are being included into the phone itself. Developments in GPS cell phone technology are continuing. If programmers can solve the issues of privacy then the potential for GPS cell phones is incredible. It will no longer be an issue of "Can you hear me now?" Rather the question will be, "Can you find me now?"
Anne King is a sports and recreation writer in Boise, Idaho. For more information on GPS cell phones, visit Maps GPS which also provides practical information on GPS and maps that everyone can use. The website includes product reviews and a maps/GPS glossary.
關於gps的英語小短文：神祕的暗物質可用GPS衛星探測到The everyday use of a GPS device might be to find your way around town or even navigate a hiking trail, but for two physicists, the Global Positioning System might be a tool in directly detecting and measuring dark matter, so far an elusive but ubiquitous form of matter responsible for the formation of galaxies. Andrei Derevianko, of the University of Nevada, Reno, and his colleague Maxim Pospelov, of the University of Victoria and the Perimeter Institute for Theoretical Physics in Canada, have proposed a method for a dark-matter search with GPS satellites and other atomic clock networks that compares times from the clocks and looks for discrepancies.
"Despite solid observational evidence for the existence of dark matter, its nature remains a mystery," Derevianko, a professor in the College of Science at the University, said. "Some research programs in particle physics assume that dark matter is composed of heavy-particle-like matter. This assumption may not hold true, and significant interest exists for alternatives."
"Modern physics and cosmology fail dramatically in that they can only explain 5 percent of mass and energy in the universe in the form of ordinary matter, but the rest is a mystery."
There is evidence that dark energy is about 68 percent of the mystery mass and energy. The remaining 27 percent is generally acknowledged to be dark matter, even though it is not visible and eludes direct detection and measurement.
"Our research pursues the idea that dark matter may be organized as a large gas-like collection of topological defects, or energy cracks," Derevianko said. "We propose to detect the defects, the dark matter, as they sweep through us with a network of sensitive atomic clocks. The idea is, where the clocks go out of synchronization, we would know that dark matter, the topological defect, has passed by. In fact, we envision using the GPS constellation as the largest human-built dark-matter detector."
Their research was well-received by the scientific community when the theory was presented at scientific conferences this year, and their paper on the topic appears today in the online version of the scientific journal Nature Physics, ahead of the print version.
關於gps的英語小短文：With the widespread use of technologies like GPS and Internet-connected camerasWith the widespread use of technologies like GPS and Internet-connected cameras, parents can now keep an eye on their children wherever they are.
The combination of high-tech tools and highly-protective parents has set off the creation of a GPS-equipped wristwatch that allows parents to listen in real time to what their children are doing. The device has caused complaints from teachers since some parents began equipping their children with the watch so they can listen in on what happens at school.
A teacher surnamed You at a well-known primary school in Pudong New Area discovered someone was eavesdropping(偷聽) on her lessons after a parent of one of her students posted something she said online while class was still on. You soon found out the parent had given her child a watch that could send out the sounds in the classroom to her mobile phone. Soon, other parents decided to equip their own children with the devices.
You was annoyed to find out her students' parents were spying on her. It made her feel as if they distrusted her. After You told her fellow teachers what had happened, they discovered that some of their students were also wearing the watches.
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