The Significance of Beidou Satellite’s Precise Measurement of Time and Satellite Timing

The significance of Beidou satellite's precise measurement of time and satellite timing The significance
of Beidou satellite's precise measurement of time and satellite timing
The so-called "time service" means that everyone checks the clock based on a certain person's clock. One person broadcasts what time, minutes, and seconds are now, and others correct their time according to the broadcast. Coordinated action is possible only when there is a common and consistent time. We can directly contact Beidou's positioning and navigation functions in our lives. Time service is to give accurate time, and for some instruments and equipment, it is to calibrate the time.
How does Beidou provide timing? Beidou satellites generally carry 3 to 4 high-precision (about 0.3 nanosecond) atomic clocks as reference time sources. The message broadcast by the satellite contains orbital coordinates and satellite time, combined with the spatial coordinates of the receiver, by solving the equations, the timing function can be realized.
The timing accuracy of Beidou can reach the level of 10 nanoseconds, which is comparable to that of GPS. The time base is a guarantee of national security, such as high-speed rail, power grid, stock market, computer network communication, cross-sea bridge and subsea tunnel construction, etc., all need time synchronization. Modern society is unthinkable without a unified time reference.
Length measurement and quality measurement are all based on precise measurement of time, and there is no precise science without precise time. Timing is the foundation of engineering. It can be said that there would be no modern technology and engineering without precise satellite timing. Two examples: The basic premise of communication is the most accurate timing. Communication needs to cut the voice, text and images you send into packets one by one, and then send them to the recipient in chronological order, and the other party reassembles these packets in chronological order to restore them into sounds and images. The more precise the time measurement, the denser the information packets can be, the greater the amount of transmission per unit time, and the higher the communication efficiency. What if the time measurement is wrong? The other party will receive a bunch of unsolvable garbled codes. It's a bit like running a train schedule. On the same rail track, if the time is accurate to the hour, you can send a train every hour, and if the time is accurate to the second, you can send a train every second. The more accurate the time, the more intensive the trains can be. For an information powerhouse like us that has occupied the 5G communication highland and is pursuing greater bandwidth and lower latency, it is obviously extremely important to master more precise time measurement methods.
The accuracy of positioning also firstly depends on the measurement of time. Take GPS positioning as an example. Several satellites are constantly broadcasting its position at a certain time, forming a series of triangle points with your phone to triangulate. The more precise the time, the more accurate the measurement. If there is no accurate time agreed by everyone, it is impossible to measure the exact position, and measuring the exact position is also very important in science, technology, engineering and even life.