Car audio and video navigation receivers can send very accurate time information, but the information is fixed. It must be converted to meet the synchronization source requirements of various devices already in use or to be used in the system. Various manufacturers and users have different requirements for synchronization. Some use pulse synchronization methods with different amplitudes, different frequencies, and different delays, and some use standard serial coding methods, such as MSF format or IRIG-B format Most users prefer to use the local clock format (such as Beijing time) rather than the UTC clock format. So a protocol converter appeared inevitably. The fixed information sent by the audio-visual navigation receiver is converted into various formats and output to meet the requirements of various devices and users. The protocol converter is commonly known as the navigation synchronization clock.
Using the same signal to synchronize all the clocks in the power grid in real time or periodically, the purpose of a unified clock can be achieved. There are roughly 3 timing methods:
(1) The power grid central dispatching station synchronizes the clocks in the system through the communication channel;
(2) Use the wireless time signal of radio stations, TV stations, and observatories;
(3) Use the clock signal of GPS global positioning system.
The first synchronization method is currently commonly used in telecontrol systems. This synchronization method requires channel time. Because the signal is transmitted to different plants through the channel, the delay of the station is different, so it can only guarantee that the time error is above the level of ms level, and the requirements on the channel are high.
The second synchronization method is greatly affected by the climate, and has a great relationship with the geographical location of the plant and station, and is susceptible to electromagnetic wave interference and loss of signal.
The third synchronization method is currently the most ideal synchronization method, namely the navigation clock synchronization method. The navigation system sends a signal every second, and its time accuracy is within 1μs. It can reliably receive the signal at any location in the world, and is an ideal synchronous clock source.
The GPS navigation satellite synchronization clock has multiple interface output methods, such as pulse synchronization method, serial port synchronization method, and encoding synchronization method, which can fully meet the synchronization requirements of various devices.
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