GPS system GPS BLOKC III prototype starts testing

　　PS is now so popular that many people have begun to think that GPS exists in their own mobile phones, not on the orbit on the head. However, these loyal machines are still fulfilling their mission to serve humans. Today, the prototype of the third -generation GPS satellite has been tested in the laboratory of Lockheed Martin in Colorado.

　　The third -generation GPS system is called GPSBLOKCIII. Its R & D and upgrade costs are as high as $ 5.5 billion. It is still controlled by the US Air Force Aerospace Command and its headquarters is located at the Base Base of Petsen Air Force in Colorado.

　　One of the major problems of today's GPS is the signal: you can't search for GPS signals under the tree, indoors, and other places. The new generation of GPSBLOCKIII satellites (it is said that the initial development purpose is only to prevent interference) greatly enhance the signal, so that you can also accept the signal blind spots in today's signal. At the same time, the positioning of the new GPS will be more accurate, from the current 6 meters (20 feet) to 0.6 meters (2 feet). At that time, your GPS can not only tell you on what road, but also tell you which part of the road, such as on non -motorized lanes or on motor lanes.

　　Due to the restrictions left by the initial design, the current GPS satellite failed to achieve a thorough separation of military channels and civilian channels. For a long time, GPS's civil frequency band (C/A code) is the military frequency band (P code) plus Add some additional interference signals. On the new generation of GPSIII satellites, this situation has been completely improved -the civilian frequency band and military frequency band have been separated, adding a special L1C folk code signal frequency band.

　　Other things about GPSIII are cool is that the United States has reached an agreement with the European Union and the L1C folk code signal frequency band. In this way, the new generation of GPS chips can receive signals from different global positioning systems, such as European Galileo navigation system, Russia's Glonass in Russia's Glonass in Russia Navigation system, even China's Beidou navigation system. The GPSIII specification also allows one receiver to use multiple system positioning data to improve accuracy.

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