一篇关于GPS与GPRS区别的好文章

一篇关于GPS与GPRS区别的好文章 On the difference between GPS and GPRS and contact GPS and GPRS just one word, so many people always confuse the two. Especially the friend, just contact GPS will always ask: what is the difference between it and GPRS? So, first contacts and let's clear this exact definition. GPS GPS, English, all known as the Global Position System, After a simple translation we get: "GPS" such a result. From the late 50s of the 20th century, Americans took 30 years, spent more than 300 billion U.S. dollars, the construction of such a brilliant large system, can be said that the history of glorious space. The inspiration of global positioning system (GPS) was born in meridian meter satellite navigation system, and meridian instrument can display satellite navigation system, positioning accuracy and fixed locating time not prompted the shortcomings of the birth of GPS. This system is composed of 24 satellite, with 11 hours into the cycle of uninterrupted 58 turning around the earth, we provide images and data. Although the altitude, 12,000 kilometers away but can insight to every corner of the earth. Therefore, the first set of equipment is only used for important national interests of the military and the civilian involved in the field of view of the tremendous value it was really used as a Civil, and completely free. Nowadays, GPS products is endless, GPS mobile phone, car GPS, GPS module ... ... Hence, the latitude and longitude of the concept of more and more, so we mentioned above the earth in the more easily also. GPRS Specifically, GPRS in the existing GSM system, developed a new packet data bearer services. GPRS and GSM system, the most fundamental difference is that, GSM is a kind of circuit switching system, and GPRS is a packet switching system. GPRS especially suitable for intermittent, sudden or frequent, small amounts of data transfer, but also to the occasional large data transfers. We can understand the GSM will GPRS is a higher level. GPRS charging methods and traditional GSM was also quite different, it is only by the data flow billing, namely according to user's data transmission to billing, For example, we download information, not by Internet time, as long as you don't charged for data transmission, even if has been "online", also need not pay. A "call", for example, in the use of GSM + WAP phones, like the telephone connected started charging, use GPRE + WAP Internet will have to a much more reasonable, like phone is not connected to charges Only dialogue when calculating the cost. Understand both the specific meaning, you will understand, GPS and GPRS is "appearance" similar only. However, the two looks similar to the guy, it touches on some really contact, so we shall not bring out a concept - AGPS. AGPS AGPS namely Assisted GPS, auxiliary global positioning system. It is combined with the traditional GSM/GPRS, using GPS satellite base stations and send information to shrink, auxiliary GPS satellite signal chip for delay time, the interior also can cover up by base stations and reduce dependence on GPS satellite chip dependence, etc. Therefore, AGPS can provide broader, more power, faster location-based services, the ideal range of error of 10 meters. And even said, can realize the GPS positioning, GPRS networks through optimization of make it more. But to achieve AGPS technology in addition to an increase in the phone GPS receiver modules, also need to transform mobile antenna, the construction of the mobile network location server, the differential GPS base station and so on. If you want to improve GPS signal shielding effectiveness, so the location area of technology will need to add more. Therefore, we do not provide this service is understandable, but when we can use this technology in China is unknown.