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Are global positioning system antennas safe
The global positioning system began in 1958 with a U. S. military program that was launched in 1964. In 1970s, the United States, navy and air force jointly developed a new generation of satellite positioning system GPS. The main purpose is for the sea and air three major areas to provide real-time, all-weather and global navigation service, and for information gathering, nuclear monitoring and emergency communication etc. some military purposes, through the experimental study of more than 20 years, at a cost of $30 billion, by 1994, global coverage of 24 GPS satellites constellation has set up to 98% complete. In the mechanical field, GPS has another meaning: product geometry, technical specifications (product geometry, technical specifications, referred to as GPS). Another meaning is G / S (GB per second). GPS (generalized processor sharing) is generalized to processor sharing, a term used in network service quality control. The external antenna signals are relatively better. The built-in antenna is convenient.
And nothing at all. GPS, GSM, GPS are used for location, GSM is for communication, and there is a AGPS that can locate base stations using mobile signals.
In the signal is not good, with external antenna can locate accurately.