Low-Cost Yet Reliable GPS-Based PRSAccurate frequency is always generated by an atomic clock. In fact, the international standard definition of time and frequency is based on the Cesium atom, and accurate frequency is typically generated by a Cesium Beam Standard. However, due to the relatively higher cost of both purchasing and maintaining a Cesium standard, it is often preferable to obtain precise frequency via a radio transfer standard such as the Global Positioning System (GPS). Using this method, the higher cost is carried by the GPS system operators, while the accuracy is obtained by using low-cost receiving equipment. Since GPS uses multiple Cesium Standards both in the ground control stations and in the satellites themselves, it provides a redundant and reliable source of accuracy.
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