Frame clock synchronization method and frame clock synchronization apparatus
A frame clock and clock signal technology, applied in the field of frame clock synchronization methods and devices, can solve the problems of cumbersome implementation methods and imperfect abnormal protection.
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Embodiment 1
[0028] like figure 1 As shown, it is a flow chart of a frame clock synchronization method provided by Embodiment 1 of the present invention, including the following steps:
[0029] Step 101, generate a GPS second pulse synchronized with the GPS clock according to the received GPS information.
[0030] For example, through the GPS antenna of the GPS signal receiver on the BTS, the GPS information transmitted by the satellite can be received, and the GPS information includes information such as GPS absolute time and GPS clock. According to the GPS information received by the GPS antenna, a GPS second pulse synchronized with the GPS clock can be generated, and the period of the GPS second pulse is 1 second. The time interval for receiving GPS information may be once per second.
[0031] Step 102, using the GPS second pulse to adjust the crystal oscillator, so that the clock signal output by the crystal oscillator and the GPS second pulse are synchronized.
[0032] The GPS sec...
Embodiment 2
[0041] Such as image 3 As shown, it is a flow chart of a frame clock synchronization method provided by Embodiment 2 of the present invention, including the following steps:
[0042] Step 201: Generate a GPS second pulse synchronized with the GPS clock according to the received GPS information.
[0043] For example, through the GPS antenna of the GPS signal receiver on the BTS, the GPS information transmitted by the satellite can be received, and the GPS information includes information such as GPS absolute time and GPS clock. According to the GPS information received by the GPS antenna, a GPS second pulse synchronized with the GPS clock can be generated, and the period of the GPS second pulse is 1 second.
[0044] Step 202, using the GPS second pulse as a clock signal, generating a high-level signal with a duration of multiple GPS second pulse periods as a high-level window.
[0045] Utilize the GPS second pulse that step 201 obtains as clock signal, the high level window ...
Embodiment 3
[0064] Such as Figure 4 As shown, it is a schematic diagram of a board structure provided by Embodiment 3 of the present invention, including: a CPU (Central Process Unit, central processing unit) 310, a frame clock synchronization device 320, a crystal oscillator 330 and a bus, wherein,
[0065] The CPU 310 is connected to the frame clock synchronization device 320 through the bus, and the frame clock synchronization device 320 is connected to the crystal oscillator 330 through the bus.
[0066] The frame clock synchronization device 320 is used to receive the GPS second pulse generated by the GPS star card, utilize the stability of the GPS second pulse, adjust the crystal oscillator 330 by the CPU 310, and make the clock signal output by the crystal oscillator 330 synchronize with the GPS second pulse, Then the clock signal output by the crystal oscillator 330 is obtained, and the obtained clock signal is frequency-divided, and the frequency-divided clock signal is a frame ...
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