Cart Tool, Tool Cart Gainran Hand Truck Co., Ltd. , http://www.wheelbarrowsupplier.com
The global ship positioning and navigation system is the most modern navigation device that emerged in the 1970s. It is a global positioning system based on the United States with 21 working satellites and 3 spare satellites and corresponding ground support equipment. The system currently has 18 satellites on average in 6 orbits, with an orbital inclination of 55 degrees and an operating period of 12 hours. Weid uses pseudo-code spread spectrum and modulation to transmit signals. The pseudo code used is a P code, a Y code, and a C/A code. The P code and Y code signal have high positioning accuracy and good security performance. The actual positioning accuracy is 10 meters, which is specially used by the US military and special users. The C/A code is used by general users and the positioning accuracy is 100 meters. The GPS satellite navigators used in China all receive C/A code signals. The final game of GPS design is: the constellation consists of 24 satellites, 21 of which are constant and 3 are spare. The Global Positioning System allows for full 24-hour two- or three-dimensional coverage worldwide.