One of the main requirements coming from different clients is to add an "anti-theft alarm" function to our gps trackers, which will trigger the loud BEEP BEEP alarm whenever the motorcyc...
Space part The space part of GPS is composed of 21 working satellites, which are located 20 200 km above the earth's surface, evenly distributed on 6 orbital planes (4 for each orbital plane)...
At present, the positioning accuracy provided by the GPS system is better than 10m. To obtain higher positioning accuracy, we usually use the differential GPS technology: place a GPS receiver on t...
Before the appearance of satellite positioning system, remote navigation and positioning mainly used wireless navigation system. 1. Radio navigation system Roland -- C: working at 100KHZ, compos...
The GPS implementation plan is divided into three stages: The first stage is the scheme demonstration and preliminary design stage. From 1973 to 1979, four test satellites were launched. The grou...
The basic principle of GPS positioning is to determine the position of the point to be measured by using the method of space distance resection based on the instantaneous position of the high-spee...
GPS is a mature technology, but in China, civil product development is not very popular, mainly concentrated in navigation equipment. In schools, information about teachers' work and students&...
In order to solve the problem of inaccurate ringing time of existing school bell equipment, we must have an accurate timing system and a reliable device to control the ringing, both of which are i...
Accurate time is necessary for astronomical observation. The accurate pointing of astronomical telescope in a specific time, the control of CCD exposure time and the high precision synchronization...
1.1 Introduction to GPS GPS (Global Positioning System) is a new generation of satellite navigation, time service and positioning system developed by the United States in the 1970s. Each of the 2...
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