P901 is the thinnest smart walkie-talkie with real time GPS tracking function.It can be used in any place with GSM signal regardless distance limitation.We've already tested one key push-to-talk N...
GPS receivers can receive time information accurate to nanoseconds that can be used for timing; forecast ephemeris used to predict the approximate position of satellites in the next few months; br...
In the late 1950s, the former Soviet Union launched the first man-made earth satellite. American scientists discovered the Doppler frequency shift phenomenon in their tracking research, and used t...
Mainly for positioning and navigation of moving objects such as ships, cars, and airplanes. E.g: 1. Ships ocean-going navigation and port diversion 2. Aircraft route guidance and approach and la...
First of all, the GPS system is a passive system for our users, that is, the user's receiver is only responsible for receiving, decoding, and computing, and will not return data, so as long as...
The previous generation of GPS is the "Meridian" navigation satellite developed by the US Navy in 1964, which is a low-orbit satellite. The main purpose is for the navigation of nuclear ...
1. Scheme demonstration and preliminary design stage. From 1973 to 1979, the United States launched 4 test satellites, established a ground tracking network, and studied the corresponding hardware...
Space part: It consists of 24 working satellites and 3 spare satellites, which are evenly distributed in 6 orbits with an inclination angle of 55, and the satellite operation period is 12 sidereal...
Due to the limitations of the Meridian satellite system, in 1973 the United States began to plan to develop a new navigation and positioning system, the GPS positioning system. After 20 years of h...
According to the geometric positioning principle of measuring navigation parameters, satellite navigation can be divided into angle measurement, time ranging, Doppler velocity measurement and comb...
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