Early GPS was always disconnected due to its weak satellite receiving ability. Especially when it was used for navigation in cities, it caused a lot of inconvenience to travel. Later, some civilia...
GPS boot positioning includes cold start, warm start and hot start: Cold start: The following cases are cold start. When first used; The ephemeris information is lost due to battery depletion; Mo...
The GPS global positioning system is built in the United States. It is mainly divided into three parts: ground control stations, satellites flying in the sky, and receivers in our hands. First, l...
GPS is now generally 12 channels, which can receive 12 satellites at the same time. Early models, such as GARMIN 45C, were 8-channel. The GPS receiver can output 2D (that is, 2D) data when it rece...
The error of C/A code is 29.3m to 2.93m. The general receiver uses C/A code to calculate the location. For its own safety, the United States added SA (Selective Availability) to the signal in the ...
Smartphone GPS is a three in one product of mobile phone, GPS and PDA handheld computer. It can update real-time data through the operator's network. As long as the GPS ephemeris file is updat...
In the design of GPS antenna unit, high-frequency and low-noise amplifiers are used to reduce the thermal noise of GPS antenna and the influence of the previous unit circuits on the receiver perfo...
GPS global positioning system is a wireless navigation system that uses navigation satellites to achieve positioning. It can realize omnipotent (ocean, land, aviation, aerospace), global, all-weat...
Conventional GPS measurement methods, such as static, fast static and dynamic measurement, need to be solved afterwards to obtain centimeter level accuracy. RTK is a measurement method that can ob...
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