CN111741522A - Timing synchronization device - Google Patents
Timing synchronization device Download PDFInfo
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- CN111741522A CN111741522A CN202010640998.7A CN202010640998A CN111741522A CN 111741522 A CN111741522 A CN 111741522A CN 202010640998 A CN202010640998 A CN 202010640998A CN 111741522 A CN111741522 A CN 111741522A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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Abstract
The invention discloses a time sequence synchronization device which comprises a synchronization signal modulation module and a synchronization signal demodulation module. The synchronous signal modulation module receives the satellite signal and demodulates the satellite signal into 1PPS second pulse. The 1PPS second pulse is transmitted to a synchronous signal demodulation module through a power line after amplitude amplification and amplitude translation. And the synchronous signal demodulation module carries out amplitude translation and amplitude reduction on the received synchronous signal to change the synchronous signal into the synchronous signal of the amplitude used by the indoor communication base station. The synchronous signal transmitted on the power line is a low-frequency pulse signal, and is not subjected to any frequency spectrum modulation, so that a frequency spectrum modulation circuit is saved. And any frequency spectrum demodulation circuit is not needed at the receiving end, so that the cost is saved. The time sequence synchronization device of the invention has no complex time delay debugging, and common operators can realize the plug and play of the equipment, thereby being convenient for field installation.
Description
Technical Field
The present invention relates to the field of synchronization signal technology, and in particular, to a timing synchronization apparatus.
Background
In the field of communications, communication base station equipment arranged indoors or in a specific enclosed space (such as a mine and a tunnel) needs to be synchronized with an outdoor open-air macro base station.
A general synchronization method is realized by an IEEE1588 (the whole name of IEEE1588 is "a precision clock synchronization protocol standard of a network measurement and control system"), but the IEEE1588 method requires an IEEE1588 server with a high price and a receiving terminal having an IEEE1588 signal demodulation function. This manner of deployment increases equipment cost and complexity of the system. The existing synchronization technology needs to use an accurate synchronization signal generator, and needs to perform complex algorithm operation on the transmission delay of the synchronization generator and the receiving end for correction. The whole set of equipment needs a professional processor for time delay correction, and the synchronous signal generator needs an expensive stable clock oscillator for generating a precise and stable reference clock. The set of equipment is complex engineering in both cost and debugging and installation of the system, and common personnel cannot complete the operation of installation and debugging.
Disclosure of Invention
The invention aims to provide a time sequence synchronization device, which can solve the problems of high cost and complex debugging and installation of synchronization signal equipment in the prior art.
The purpose of the invention is realized by the following technical scheme:
the timing synchronization device comprises a synchronization signal modulation module and a synchronization signal demodulation module, wherein the synchronization signal modulation module receives satellite signals and demodulates the satellite signals into 1PPS (pulse per second) pulse serving as synchronization signals; the 1PPS second pulse is transmitted to a synchronous signal demodulation module through a power line after amplitude amplification and amplitude translation; and the synchronous signal demodulation module carries out amplitude translation and amplitude reduction on the received synchronous signal to change the synchronous signal into the synchronous signal of the amplitude used by the indoor communication base station.
Furthermore, the synchronous signal modulation module comprises a satellite signal receiver, an amplitude booster and a first amplitude translation circuit; the satellite signal receiver receives the synchronous signal and demodulates the pulse of 1 PPS; the amplitude booster is used for boosting the amplitude of the 1PPS second pulse to be larger than the amplitude of the transmission voltage of the power line; the first amplitude translation circuit carries out amplitude translation on the 1PPS second pulse with the raised amplitude and then sends the pulse to the synchronous signal demodulation module through a power line.
Further, the synchronization signal demodulation module comprises a second amplitude translation circuit and an amplitude reducer; and the second amplitude translation circuit carries out amplitude translation on the received synchronization again, and then carries out amplitude reduction processing through the amplitude reducer.
The invention adopts a satellite signal receiver to receive satellite (such as a Beidou satellite/GPS satellite) signals or specific pilot frequency reference signals sent by a macro base station, and demodulates 1PPS (PPS is short for pulse per second, 1PPS is 1Hz and 1 times/second). The 1 PPS-sec burst is in close synchronization with the macro base station which also uses the positioning satellite 1 PPS-sec burst. The demodulated 1PPS second pulse is only promoted by the reference level of the analog signal, so that the amplitude of the demodulated 1PPS second pulse is higher than the amplitude of power supply voltage transmitted by a power line, the 1PPS second pulse is prevented from being submerged in the power supply voltage, and the 1PPS second pulse is prevented from being interfered by the power supply. The source end outdoors only needs a satellite signal receiver, a 1PPS pulse amplitude amplifying circuit (amplifier), a 1PPS pulse reference amplitude translation circuit (first amplitude translation circuit), and the receiving end only needs a 1PPS pulse reference amplitude translation circuit (second amplitude translation circuit), a 1PPS pulse amplitude voltage reduction circuit (voltage reducer) to reduce the 1PPS second pulse amplitude to the 1PPS signal (such as 3.3Vp-p) of the amplitude that the mobile communication equipment can use, so that the reduced synchronous signal can be accessed into the mobile communication base station to carry out the synchronization between the communication signal and the macro base station for outdoor communication.
The time sequence synchronization device of the invention has no complex time delay debugging, and common operators can realize the plug and play of the equipment, thereby facilitating the field installation of the equipment. And a professional processor is not needed for time delay operation adjustment, so that an expensive clock oscillator and a professional processor are saved, and the production and manufacturing cost is greatly saved.
Drawings
FIG. 1 is a schematic circuit diagram of a synchronization signal modulation module according to the present invention;
fig. 2 is a schematic circuit diagram of the synchronization signal demodulation module according to the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The timing synchronization device comprises a synchronization signal modulation module and a synchronization signal demodulation module, wherein the synchronization signal modulation module receives a synchronization signal and demodulates the synchronization signal into 1PPS (pulse per second), and the synchronization signal is a satellite synchronization signal or a specific pilot frequency reference signal sent by a macro base station. The 1PPS second pulse is transmitted to a synchronous signal demodulation module through a power line after amplitude amplification and amplitude translation. The synchronous signal demodulation module carries out amplitude translation and amplitude reduction on the received signal to obtain the synchronous signal with the amplitude which can be used by the indoor communication base station. The demodulated synchronous signal is directly input into indoor or tunnel or mine deployed mobile communication base station equipment as synchronous signal input.
Further, in a preferred embodiment of the present invention, the synchronization signal modulation module includes a satellite signal receiver, an amplifier, and a first amplitude shifting circuit. The satellite signal receiver is used for receiving satellite signals or specific pilot frequency reference signals sent by the macro base station and demodulating 1PPS second pulses. The booster boosts the amplitude of the 1 PPS-sec pulse to be greater than the amplitude of the power line transmission voltage. The first amplitude translation circuit carries out amplitude translation on the 1PPS second pulse with the raised amplitude and then sends the pulse to the synchronous signal demodulation module through a power line.
Further, in a preferred embodiment of the present invention, the synchronization signal demodulation module includes a second amplitude shift circuit and an amplitude reducer. And the second amplitude translation circuit carries out amplitude translation on the received second pulse of 1PPS again, and then carries out amplitude reduction processing through the amplitude reducer. The pulse signal after amplitude reduction processing is a synchronization signal that can be used by the indoor communication base station.
In the invention, the amplitude of the 1PPS pulse-per-second synchronization signal is increased by the amplitude booster, the power line is used as a transmission medium, the central amplitude of the 1PPS pulse synchronization signal is higher (such as higher by 30V) than the voltage amplitude (such as 220V) transmitted by the power line, the 1PPS timing pulse is completely separated from the power signal transmitted by the power line, the distortion of the synchronization signal caused by the voltage fluctuation and the voltage waveform distortion of the power line can be reduced, and the anti-interference capability of the synchronization signal is improved.
The invention transmits low-frequency pulse signals on the power line without any spectrum modulation, thereby saving a spectrum modulation circuit. And any frequency spectrum demodulation circuit is not needed at the receiving end, so that the cost is saved.
The first amplitude translation circuit is used for lifting the reference zero level of the amplified pulse synchronization signal above the voltage of a power supply wire, so that the pulse synchronization signal is prevented from being submerged by the power supply voltage and cannot be restored. The second amplitude shift circuit is used for reducing the reference zero level of the pulse synchronization signal which is raised by the first amplitude shift circuit to the reference zero level to be consistent with the reference zero level of the communication base station, so that the communication base station can correctly identify the pulse synchronization signal.
The modulated 1PPS second pulse synchronous signal belongs to a low-frequency analog signal, and does not carry out any complex processing of frequency spectrum modulation/demodulation and AD/DA conversion such as frequency spectrum modulation, digital conversion and digital packaging in the transmission process, so that the time delay of the signal in the transmission process can be strictly ensured, and the accuracy is ensured.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (3)
1. The timing synchronization device comprises a synchronization signal modulation module and a synchronization signal demodulation module, and is characterized in that the synchronization signal modulation module receives satellite signals and demodulates the satellite signals into 1PPS (pulse per second) pulse serving as synchronization signals; the 1PPS second pulse is transmitted to a synchronous signal demodulation module through a power line after amplitude amplification and amplitude translation; and the synchronous signal demodulation module carries out amplitude translation and amplitude reduction on the received synchronous signal to change the synchronous signal into the synchronous signal of the amplitude used by the indoor communication base station.
2. The timing synchronization apparatus of claim 1, wherein the synchronization signal modulation module comprises a satellite signal receiver, an amplifier and a first amplitude shifting circuit; the satellite signal receiver receives the satellite signal and demodulates the pulse of 1 PPS; the amplitude booster is used for boosting the amplitude of the 1PPS second pulse to be larger than the amplitude of the transmission voltage of the power line; the first amplitude translation circuit carries out amplitude translation on the 1PPS second pulse with the raised amplitude and then sends the pulse to the synchronous signal demodulation module through a power line.
3. The timing synchronization apparatus of claim 1, wherein the synchronization signal demodulation module comprises a second amplitude shifting circuit and an amplitude reducer; and the second amplitude translation circuit carries out amplitude translation on the received synchronization again, and then carries out amplitude reduction processing through the amplitude reducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640998.7A CN111741522B (en) | 2020-07-06 | Time sequence synchronizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640998.7A CN111741522B (en) | 2020-07-06 | Time sequence synchronizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111741522A true CN111741522A (en) | 2020-10-02 |
| CN111741522B CN111741522B (en) | 2024-06-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112751379A (en) * | 2020-12-28 | 2021-05-04 | Oppo广东移动通信有限公司 | In-band communication method and system, terminal, charging device and storage medium |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112751379A (en) * | 2020-12-28 | 2021-05-04 | Oppo广东移动通信有限公司 | In-band communication method and system, terminal, charging device and storage medium |
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