Waas and EGNOS improve GPS positioning accuracy

　　This is also a very interesting question. When buying GPS devices, you know that GPS has many characteristics. Waas and EGNOS can double the positioning accuracy, but these two characteristics are not completely applicable for users in China.

　　The full name of WAAS is the Wide Area Augmentation System, that is, the wide area enhancement system, the purpose is to further provide the accuracy of the GPS positioning, the region is limited to the United States; the full name of the EGNOS is the EUROPEAN GEOSTATIONAVIGATION OVERLAY Service, which is basically the overlap service of the European Star Navigation, which is basically basically basically. Empathy is equivalent to WAAS, only serving in Europe. Although your GPS has these characteristics, the upper use is limited to specific areas.

　　China is also developing the corresponding system. In fact, the principle of this enhancement system is very simple. On the existing GPS artificial satellite system, add more than three or more static track satellites. Similarly, it runs on the orbit of Earth's rotation speed to become a relatively static state. The GPS receiver also receives the signals issued by these satellites at the same time to modify the error caused by the original GPS system due to the atmospheric conduction, which further improves the positioning accuracy of about 5 meters, which looks very tempting.

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