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 the various devices already in use or to be used in the system. The requirements for synchronization by various manufacturers and users are different. Some use pulse synchronization methods with different amplitudes, different frequencies and different delays, while others 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) instead of using the UTC clock format. Thus, a protocol converter has inevitably appeared. The fixed information sent by the AV navigation receiver is converted into a variety of different format outputs to meet the requirements of various devices and users. The protocol converter is commonly known as a navigation sync clock.
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When the same signal is used to synchronize all the clocks in the grid in real time or periodically, the purpose of the unified clock can be achieved. There are currently three ways to do this:
(1) The power grid central dispatching station synchronizes each clock in the system through the communication channel;
(2) Using radio time signals from radio stations, television stations, and observatories;
(3) Using the GPS global positioning system clock signal.
The first synchronization method is a commonly used method in the current telecontrol system, and the synchronization method needs to occupy the channel time. Since the signals are transmitted to different factories through the channel, the delay of the stations is not the same, so only the error of the time is above the level of ms, and the requirements for the channel are high.
The second synchronization method is relatively affected by the climate, and has a great relationship with the geographical location of the plant and station, and is susceptible to electromagnetic waves and loss of signals.
The third synchronization method is currently the most ideal synchronization method, that is, the navigation clock synchronization method. The navigation system sends a signal every second with a time accuracy of less than 1μs, and it can reliably receive signals anywhere in the world. It is an ideal synchronous clock source.
GPS navigation satellite synchronous clock has a variety of interface output methods, such as pulse synchronization mode, serial port synchronization mode, code synchronization mode, etc., which can fully meet the synchronization requirements of various devices.
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