CN103188066A - Reference clock signal processing method and device - Google Patents
Reference clock signal processing method and device Download PDFInfo
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- CN103188066A CN103188066A CN201310066358XA CN201310066358A CN103188066A CN 103188066 A CN103188066 A CN 103188066A CN 201310066358X A CN201310066358X A CN 201310066358XA CN 201310066358 A CN201310066358 A CN 201310066358A CN 103188066 A CN103188066 A CN 103188066A
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Abstract
The invention provides a reference clock signal processing method and device. The reference clock signal processing method comprises the following steps of: receiving a GNSS (Global Navigation Satellite System) signal; generating a time signal and a signal of a pulse per second according to the GNSS signal; and combining the generated time signal, the signal of the pulse per second and a power supply into one path of signal, and transmitting the path of signal into one or more reduction equipment, wherein the one or more reduction equipment is used for reducing the signal of the pulse per second as a reference clock signal. According to the reference clock signal processing method and device, the problems of high cost, large power consumption and low flexibility existing in technologies of acquiring a clock synchronization signal in related technologies are solved, and furthermore, the purposes of expanding a scope of the GNSS signal (such as a GPS (Global Positioning System)) as a color synchronization reference source, enabling one GPS to support a plurality of equipment needing time synchronization, and reducing the equipment and system cost are achieved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of reference clock signal processing method and device.
Background technology
Clock system is one of key technology in the modern communication field, and the normal operation of clock circuit and clock system is communication apparatus operate as normal and professional basis.A lot of communications network systems, for example, wireless TD SDMA (Time Division-Synchronous Code Division Multiple Access, abbreviating TD-SCDMA as) network system, code division multiple access (Code Division Multiple Access abbreviates CDMA as) network system etc. all be to need the exact time synchronization system.In correlation technique, most base stations all be to realize synchronously by global positioning system (Global Positioning System abbreviates GPS as) receiving equipment is installed in each base station synchronously.The GPS receiving equipment is by receiving the navigation message information of gps satellite, calculate positional information and the temporal information of GPS receiver, and by serial ports transmission Time of Day (Time Of Data, abbreviate TOD as) message, by pulse per second (PPS) mouth output pulse per second (PPS) (1Pulse Per Second abbreviates PP1S as) signal.The base station utilizes TOD message and PP1S information to realize time synchronized.
Traditional GPS receiving equipment mainly comprises GPS reception antenna and two parts of GPS receiver, can better receive the GPS radiofrequency signal in order to guarantee gps antenna, generally gps antenna need be installed in open outdoor environment; Connect by coaxial cable between GPS reception antenna and the GPS receiver.Transmission hundreds of rice or 1KM are equidistant between GPS reception antenna and the receiver if desired, because the coaxial cable decay is very big, can cause the received signal quality variation, can't guarantee clock accuracy, in addition, because the coaxial cable cost is very high, not only bad for reducing cost, and be unfavorable for project installation, cause product nocompetitive.
Along with development of Communication Technique, clock is also had higher requirement synchronously, traditional GPS receiver method of synchronization volume, power consumption and flexibility all are restricted, therefore, need to adopt and to zoom out GPS receiver mode and carry out synchronously, in number of patent application is the patent of CN201010528530.5, proposed " a kind of acquisition methods of reference clock signal and system ".In this patent, need use optical fiber and power line simultaneously, all adopt string and conversion equipment to receive and dispatch fiber-optic signal simultaneously on RGPS and the Clock Card, therefore, adopt the method for this patent can not realize that while RGPS supports the application of a plurality of wireless base stations, in addition, not only also there is the cost height, power consumption height, unfavorable problems such as design complexity, and, for the wireless base station of cost and volume-sensitive particularly femto base station such as PICO, FEMTOCELL be unacceptable.
Therefore, all have the cost height in the technology of obtaining clock sync signal in correlation technique, power consumption is big, the problem that flexibility is little.
Summary of the invention
The invention provides a kind of reference clock signal processing method and device, all to have the cost height in the technology of obtaining clock sync signal in correlation technique at least, power consumption is big, the problem that flexibility is little.
According to an aspect of the present invention, provide a kind of reference clock signal processing method, having comprised: received the global navigation satellite system GNSS signal; According to described GNSS signal generation timing signal and pps pulse per second signal; Described time signal, pps pulse per second signal and the power supply that generates merged to one the tunnel be transferred to one or more reduction apparatuss, wherein, described one or more reduction apparatuss restore the pps pulse per second signal as described reference clock signal.
Preferably, described time signal, pps pulse per second signal and the described power supply that generates merged to one the tunnel is transferred to described one or more reduction apparatus, wherein, the cable that merges to one tunnel transmission comprise following one of at least: power line, twisted-pair feeder, coaxial cable.
Preferably, under described reduction apparatus is a plurality of situation, the described time signal that will generate, pps pulse per second signal and described power supply merge to one the tunnel be transferred to described a plurality of reduction apparatus before, also comprise: determine that by the report for work mode of formula poll of reduction apparatus a master uses reduction apparatus from described a plurality of reduction apparatuss, wherein, described master is used for control far-end integration apparatus with reduction apparatus, is described time signal and described pps pulse per second signal with the signal of determining to send to described a plurality of reduction apparatuss with the power supply merging.。
According to a further aspect in the invention, a kind of reference clock signal processing method is provided, comprise: what received from the merging of far-end integration apparatus time signal, pps pulse per second signal and power supply closes the road signal, wherein, described far-end integration apparatus generates described time signal and pps pulse per second signal according to the global navigation satellite system GNSS signal that receives; From the described pps pulse per second signal that restores the signal of road as described reference clock signal that closes that receives.
Preferably, from receive described close the pps pulse per second signal that restores the signal of road as described reference clock signal after, also comprise: the described pps pulse per second signal that restores is carried out delay compensation.
Preferably, obtain the delay compensation that the described pps pulse per second signal that restores is carried out delay compensation: T=T1+T2 in the following manner, wherein, T is described delay compensation, T1 is the internal delay time of both sides' equipment of the described pps pulse per second signal of transmission, and T2 is the time-delay of the transmission line between both sides' equipment of the described pps pulse per second signal of transmission.
Obtain described T1 and/or T2:T1/T2=((Td-Ta in the following manner)-(Tc-Tb))/2, wherein, an end that transmits the both sides of described pps pulse per second signal is measured message to other end forward delay interval, Ta is that an end sends the moment of measuring message, Tb is the moment that the other end receives this latency measurement message, Tc is the moment of other end transmission delay response message, and Td is the moment that a termination is received this time delay response message.
According to another aspect of the invention, provide a kind of reference clock signal processing unit, having comprised: first receiver module is used for receiving the global navigation satellite system GNSS signal; Generation module is used for according to described GNSS signal generation timing signal and pps pulse per second signal; Merge module, the described time signal, pps pulse per second signal and the power supply that are used for generating merge to one the tunnel and are transferred to one or more reduction apparatuss, and wherein, described one or more reduction apparatuss restore the pps pulse per second signal as described reference clock signal.
Preferably, this device also comprises: determination module, be used under described reduction apparatus is a plurality of situation, determine that by the report for work mode of formula poll of reduction apparatus a master uses reduction apparatus from described a plurality of reduction apparatuss, wherein, described master is used for control far-end integration apparatus with reduction apparatus, is described time signal and described pps pulse per second signal with the signal of determining to send to described a plurality of reduction apparatuss with the power supply merging.
According to also one side of the present invention, a kind of reference clock signal processing unit is provided, comprise: second receiver module, what be used for to have received from the merging of far-end integration apparatus time signal, pps pulse per second signal and power supply closes the road signal, wherein, described far-end integration apparatus generates described time signal and pps pulse per second signal according to the global navigation satellite system GNSS signal that receives; Recovery module is used for restoring pps pulse per second signal as described reference clock signal from the described road signal that closes that receives.
Preferably, this device also comprises: compensating module is used for the described pps pulse per second signal that restores is carried out delay compensation.
Preferably, described compensating module comprises: acquiring unit, be used for obtaining in the following manner the delay compensation that the described pps pulse per second signal that restores is carried out delay compensation: T=T1+T2, wherein, T is described delay compensation, T1 is the internal delay time of both sides' equipment of the described pps pulse per second signal of transmission, and T2 is the time-delay of the transmission line between both sides' equipment of the described pps pulse per second signal of transmission.
Preferably, described acquiring unit comprises and obtains subelement: be used for obtaining in the following manner described T1 and/or T2, T1/T2=((Td-Ta)-(Tc-Tb))/2, wherein, an end that transmits the both sides of described pps pulse per second signal is measured message to other end forward delay interval, and Ta is that an end sends the moment of measuring message, and Tb is the moment that the other end receives this latency measurement message, Tc is the moment of other end transmission delay response message, and Td is the moment that a termination is received this time delay response message.
By the present invention, adopt to receive the global navigation satellite system GNSS signal; According to described GNSS signal generation timing signal and pps pulse per second signal; With the described time signal that generates, pps pulse per second signal and power supply merge to one the tunnel and are transferred to one or more reduction apparatuss, wherein, described one or more reduction apparatus restores the pps pulse per second signal as described reference clock signal, solved in the technology of obtaining clock sync signal in correlation technique and all had the cost height, power consumption is big, the problem that flexibility is little, and then reached and (for example to have expanded the GNSS signal, gps signal) as the scope in clock reference synchronization source, and make a GPS can support a plurality of equipment that need time synchronized, reduction equipment, the effect of system cost.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart one according to the reference clock signal processing method of the embodiment of the invention;
Fig. 2 is the flowchart 2 according to the reference clock signal processing method of the embodiment of the invention;
Fig. 3 is the structured flowchart one according to the reference clock signal processing unit of the embodiment of the invention;
Fig. 4 is the preferred structure block diagram one according to the reference clock signal processing unit of the embodiment of the invention;
Fig. 5 is the structured flowchart two according to the reference clock signal processing unit of the embodiment of the invention;
Fig. 6 is the preferred structure block diagram two according to the reference clock signal processing unit of the embodiment of the invention;
Fig. 7 is the another preferred structure block diagram two according to the reference clock signal processing unit of the embodiment of the invention;
Fig. 7 a is the preferred structure block diagram according to acquiring unit 72 in the another preferred structure block diagram two of the reference clock signal processing unit of the embodiment of the invention;
Fig. 8 is the structured flowchart according to the far-end integration apparatus of the embodiment of the invention;
Fig. 9 is the PP1S compensation of delay schematic diagram according to the embodiment of the invention;
Figure 10 is the schematic diagram of supporting a plurality of reduction apparatuss according to the far-end integration apparatus of the embodiment of the invention;
Figure 11 closes road sequential schematic diagram according to the PP1S signal of the embodiment of the invention and TOD signal;
Figure 12 is the flow chart of reference clock signal processing method when supporting a plurality of reduction apparatus according to the far-end integration apparatus of the embodiment of the invention;
Figure 13 is the flow chart that obtains the reference clock signal method according to the base station of the embodiment of the invention;
Figure 14 a is the schematic diagram of supporting a reduction apparatus according to the far-end integration apparatus of the single-ended signal of the embodiment of the invention;
Figure 14 b is the schematic diagram of supporting a plurality of reduction apparatuss according to the far-end integration apparatus of the single-ended signal of the embodiment of the invention;
Figure 14 c is the schematic diagram of supporting a reduction apparatus according to the far-end integration apparatus of the differential signal of the embodiment of the invention;
Figure 14 d is the schematic diagram of supporting a plurality of reduction apparatuss according to the far-end integration apparatus of the differential signal of the embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
A kind of reference clock signal processing method is provided in the present embodiment, and Fig. 1 is the flow chart one according to the reference clock signal processing method of the embodiment of the invention, and as shown in Figure 1, this flow process comprises the steps:
Step S102 receives GLONASS (Global Navigation Satellite System) (Global Navigation Satellite System abbreviates GNSS as) signal;
Step S104 is according to above-mentioned GNSS signal generation timing signal and pps pulse per second signal;
Step S106, above-mentioned time signal, pps pulse per second signal and the power supply that generates merged to one the tunnel be transferred to one or more reduction apparatuss, wherein, above-mentioned one or more reduction apparatus restores the pps pulse per second signal as reference clock signal, and the cable that merges to one tunnel transmission can be multiple, for example, can for following one of at least: power line, twisted-pair feeder, coaxial cable, can certainly be other similar cable, be not limited to above-mentioned severally, not give an example one by one at this.
Pass through above-mentioned steps, will be according to the GNSS signal (for example, gps satellite signal) time signal of Sheng Chenging, pps pulse per second signal and power supply merge to one the tunnel and are transferred to one or more reduction apparatuss, not only use optical fiber but also need to use power line with respect to needing in the correlation technique, and need string and conversion equipment to receive and dispatch fiber-optic signal, and the equipment that adopts aforesaid way only can support needs to carry out time synchronized obtains reference clock signal, cost height not only, power consumption is big, and equipment complexity, by signal and power supply are merged to one tunnel transmission, not only solved in the technology of obtaining clock sync signal in correlation technique and all had the cost height, power consumption is big, the problem that flexibility is little, and then reached and to expand GPS as the scope in clock reference synchronization source, and make a GPS can support a plurality of equipment that need time synchronized, reduction equipment, the effect of system cost.
Owing to send the not merely free signal of the sender who closes the road signal and pps pulse per second signal, therefore, under reduction apparatus was a plurality of situation, what need determine from a plurality of reduction apparatuss that a master comes to control that these a plurality of reduction apparatuss need to the sender with reduction apparatus was time signal, pps pulse per second signal.And determine that this main mode with reduction apparatus can be multiple, for example, can by reduction apparatus report for work the formula poll mode (for example, the mode of reduction apparatus IP address mantissa poll) determines that from these a plurality of reduction apparatuss a master uses reduction apparatus, wherein, this master is used for control far-end integration apparatus with reduction apparatus, to determine that to the signal with the power supply merging of a plurality of reduction apparatuss transmissions be time signal and pps pulse per second signal, namely be used for control far-end integration apparatus, with signal content and the pps pulse per second signal of determining to send to a plurality of reduction apparatuss.For example, the poll predetermined number (for example in 1S, 256) IP address mantissa, if the IP address mantissa of reduction apparatus is consistent with the IP address mantissa that the far-end integration apparatus sends, then definite this reduction apparatus is used reduction apparatus for this is main, afterwards, no matter be that main also whether leading with reduction apparatus with reduction apparatus all closed the sender of road signal by single line cable reception reference clock signal from transmission.
A kind of reference clock signal processing method is provided in the present embodiment, and Fig. 2 is the flowchart 2 according to the reference clock signal processing method of the embodiment of the invention, and as shown in Figure 2, this flow process comprises the steps:
Step S202, what received from the merging of far-end integration apparatus time signal, pps pulse per second signal and power supply closes the road signal, and wherein, this far-end integration apparatus generates above-mentioned time signal and pps pulse per second signal according to the global navigation satellite system GNSS that receives;
Step S204 is from the above-mentioned pps pulse per second signal that restores the signal of road as this reference clock signal that closes that receives.
Pass through above-mentioned steps, by will be according to GNSS(for example, GPS) time signal of satellite-signal generation and pps pulse per second signal and power supply merge reception, then from close the road signal, restore the pps pulse per second signal as reference clock signal, use optical fiber and power line simultaneously with respect to needing in the correlation technique, cost height not only, the power consumption height, and equipment complexity, not only solved GPS mandate cost height in the correlation technique, and the many problems of equipment interface number, and, advantageously expand the range of application of using GPS to authorize, reduced equipment, system cost.
In order to make reference clock more accurate, can carry out delay compensation to the pps pulse per second signal that restores from closing after the pps pulse per second signal that restores the signal of road as reference clock signal of receiving.The emphasis that can consider according to concrete condition when carrying out delay compensation is different and give priority to, for example, generally there are two aspects in time delay, is comparatively fixing time delay on the one hand, be along with transmission range on the other hand, and the different and variational time delay that exists of length of cable, specifications and models.According to the emphasis difference at the required consideration of different situations, can have this two aspect and carry out delay compensation with stressing.
The mode of carrying out delay compensation can be multiple, introduce a kind of preferred mode at this, for example, obtain the delay compensation that the pps pulse per second signal that restores is carried out delay compensation: T=T1+T2 in the following manner, wherein, T is this delay compensation, and T1 is the internal delay time of both sides' equipment of transmission pps pulse per second signal, and T2 is the time-delay of the transmission line between both sides' equipment of transmission pps pulse per second signal.Wherein, for above-mentioned two kinds of time delays, the account form that all can adopt following transmission delay to measure message obtains: an end of both sides' equipment of transmission pps pulse per second signal is measured message to other end forward delay interval, the record delivery time is Ta, the other end receives this Time delay measurement message and return time delay is measured response message, wherein, Tb is the moment that receives this latency measurement message, Tc is for sending the moment of this time delay response message, Td is the moment that receives this time delay response message, therefore, this latency measurement value is T=((Td-Ta)-(Tc-Tb))/2.
A kind of reference clock signal processing unit also is provided in the present embodiment, and this device is used for realizing above-described embodiment and preferred implementation, had carried out repeating no more of explanation.As used below, the combination of software and/or the hardware of predetermined function can be realized in term " module ".Although the described device of following examples is preferably realized with software, hardware, perhaps the realization of the combination of software and hardware also may and be conceived.
Fig. 3 is the structured flowchart one according to the reference clock signal processing unit of the embodiment of the invention, and as shown in Figure 3, this device comprises first receiver module 32, generation module 34 and merges module 36, below this device described.
First receiver module 32 is used for receiving the global navigation satellite system GNSS signal; Generation module 34 is connected to above-mentioned first receiver module 32, is used for according to above-mentioned GNSS signal generation timing signal and pps pulse per second signal; Merge module 36, be connected to above-mentioned generation module 34, the time signal, pps pulse per second signal and the power supply that are used for generating merge to one the tunnel and are transferred to one or more reduction apparatuss, and wherein, these one or more reduction apparatuss restore the pps pulse per second signal as reference clock signal.
Fig. 4 is the preferred structure block diagram one according to the reference clock signal processing unit of the embodiment of the invention, and as shown in Figure 4, this device also comprises determination module 42 except comprising all modules shown in Figure 3, below this determination module 42 is described.
Determination module 42, be connected to above-mentioned first receiver module 32, be used under reduction apparatus is a plurality of situation, determine that by the report for work mode of formula poll of reduction apparatus a master uses reduction apparatus from above-mentioned a plurality of reduction apparatuss, wherein, this master is used for control far-end integration apparatus with reduction apparatus, is time signal and pps pulse per second signal with the signal of determining to send to above-mentioned a plurality of reduction apparatuss with the power supply merging.
Fig. 5 is the structured flowchart two according to the reference clock signal processing unit of the embodiment of the invention, and as shown in Figure 5, this device comprises second receiver module 52, recovery module 54, below this device is described.
Second receiver module 52, what be used for to have received from the merging of far-end integration apparatus time signal, pps pulse per second signal and power supply closes the road signal, wherein, this far-end integration apparatus is according to the global navigation satellite system GNSS generation timing signal and the pps pulse per second signal that receive; Recovery module 54 is connected to above-mentioned second receiver module 52, is used for restoring pps pulse per second signal as reference clock signal from the road signal that closes that receives.
Fig. 6 is the preferred structure block diagram two according to the reference clock signal processing unit of the embodiment of the invention, and as shown in Figure 6, this device also comprises compensating module 62 except comprising all modules shown in Figure 5, below this compensating module 62 is described.
This compensating module 62 is connected to above-mentioned recovery module 54, is used for the pps pulse per second signal that restores is carried out delay compensation.
Fig. 7 is the another preferred structure block diagram two according to the reference clock signal processing unit of the embodiment of the invention, and as shown in Figure 7, this compensating module 62 comprises: acquiring unit 72 describes this acquiring unit 72 below.
This acquiring unit 72, be used for obtaining in the following manner the delay compensation that the pps pulse per second signal that restores is carried out delay compensation: T=T1+T2, wherein, T is delay compensation, T1 is the internal delay time of both sides' equipment of transmission pps pulse per second signal, and T2 is the time-delay of the transmission line between both sides' equipment of transmission pps pulse per second signal.
Fig. 7 a is the preferred structure block diagram according to acquiring unit 72 in the another preferred structure block diagram two of the reference clock signal processing unit of the embodiment of the invention, shown in Fig. 7 a, this acquiring unit 72 comprises and obtains subelement 72a, below this is obtained subelement 82 and describes.
Obtain subelement 72a: be used for obtaining in the following manner above-mentioned T1 and/or T2, T1/T2=((Td-Ta)-(Tc-Tb))/2, wherein, the both sides' of transmission pps pulse per second signal a end is measured message to other end forward delay interval, Ta is that an end sends the moment of measuring message, Tb is the moment that the other end receives this latency measurement message, and Tc is the moment of other end transmission delay response message, and Td is the moment that a termination is received this time delay response message.
At the restriction of the Phase synchronization base station system external environment factor in the correlation technique to the gps antenna installation site, a kind of acquisition methods and system of reference clock signal are provided in the present embodiment, by this technical scheme, solved and used fiber optic stretch RGPS wiring cost and equipment to need the problem of optical module interface in the correlation technique, by using power supply and signal to share a pair of cable, reduced the demand of lightning protection and optical module, reduce equipment interface quantity, thereby reduced cost and the cable cost of equipment effectively.In addition, owing to adopted interactively single bus communication protocol mechanism, can guarantee that a far-end integration apparatus can support a plurality of reduction apparatuss simultaneously and not increase cost.Main thought to this technical scheme describes below.
The acquisition methods of the reference clock signal that provides in the present embodiment comprises: the far-end integration apparatus (for example, zoom out global positioning system (GPS) receiving equipment, again for example, can also be the Big Dipper navigation system receiving equipment, be that example describes with the GPS receiving equipment here) the reception gps satellite signal; According to this gps satellite signal generation time that receives (for example, TOD) signal and pulse per second (PPS) (for example, PP1S) signal; With time of producing (for example, TOD) signal, (for example, PP1S) signal and power supply merge to and lead up to power line or twisted-pair feeder and send reduction apparatus in pulse per second (PPS); Fig. 8 is the structured flowchart according to the far-end integration apparatus of the embodiment of the invention, and as shown in Figure 8, this far-end integration apparatus comprises: signal receiving unit 82(function is with above-mentioned first receiver module 32), for the function of finishing above-mentioned reception gps satellite signal; Signal processing unit 84(function is with above-mentioned generation module 34), for the function of finishing above-mentioned generation time signal and pps pulse per second signal; And signal transmitting and receiving and power supply combiner unit 86(function are with above-mentioned merging module 36), be used for finishing above-mentioned one tunnel function that time signal, pps pulse per second signal and power supply are merged to, wherein, this closes the road signal and sends reduction apparatus to by power line or twisted-pair feeder.
Reduction apparatus (for example, base station equipment) is responsible for power supply, simultaneously can be with power supply and signal decoupling zero, and recover pulse per second (PPS) (for example, PP1S) signal and time (for example, TOD) signal, and this PP1S signal that recovers compensated, with the PP1S signal after the compensation as reference clock signal.
Support the problem of a plurality of reduction apparatuss in order to solve a far-end integration apparatus, guarantee that by using the monobus communication mechanism far-end integration apparatus shares a receiver and a pair of cable that zooms out is supported a plurality of reduction apparatuss.
Based on the explanation to the main thought of technical scheme, a kind of acquisition methods of preferred reference clock signal is provided in the present embodiment, this method may further comprise the steps:
S1, the far-end integration apparatus receives the satellite gps signal by the equipment built-in aerial, this gps signal that receives is carried out signal resolution produce local TOD information and PP1S signal.
S2, far-end integration apparatus unite two into one TOD information and PP1S signal and produce one road signal, and close road output by mode and the power supply of coupling.
S3 powers on and determines host apparatus by the far-end integration apparatus formula poll of reporting for work.
S4, also the cable transmission time-delay is zoomed out in calculating to host apparatus alternately with zooming out integrated receiver (or claiming to zoom out integration apparatus).
S5 sends TOD and PP1S signal to reduction apparatus by a pair of remote twisted-pair feeder, and reduction apparatus produces local reference clock signal and TOD message and carries out the time service application according to the above-mentioned TOD that receives and PP1S signal resolution.
By above-described embodiment and preferred implementation, having overcome the GPS time service antenna feeder cable in the correlation technique, to zoom out distance limited, and shortcomings such as cost height solve in the existing RGPS technology problems such as cable and equipment interface number be too much.Owing to possess accurate Time delay measurement and compensation way, can obtain the precise time synchronizing signal, to guarantee the operation of clock synchronization system; Because the digital data transmission distance is far away than radio frequency transmission, therefore, broken away from the restriction of external environment factor to the gps antenna installation site simultaneously, the range of application of using the GPS integration apparatus to carry out time service obviously increases; Because equipment does not need the light mouth, power supply and signal share a pair of cable, have reduced the demand of lightning protection and optical module, thereby have reduced cost and the cable cost of equipment, and have reduced equipment interface quantity simultaneously.Owing to adopted interactively single bus communication protocol mechanism, can guarantee that a far-end integration apparatus can support a plurality of equipment simultaneously and not increase cost.
Describe below in conjunction with the enforcement of accompanying drawing to technical scheme.
The basic thought of the embodiment of the invention is signals such as power supply and TOD and PP1S to be closed the road in the transmission of a pair of cable realization gps clock signal, and recover reference clock signal accurately at receiving terminal, to be used for time synchronized.Describe below in conjunction with possessing the above-mentioned basic thought of participation device to preferred embodiment.
The far-end integration apparatus receives gps signal, produce TOD signal and PP1S signal, this TOD signal of electrical signal form and PP1S signal are closed the road form one road signal, and by coupling power supply and signal are closed the road, send to reduction apparatus by power line or twisted-pair feeder;
Reduction apparatus receives PP1S and the TOD signal that electric form is closed the road, isolates PP1S and TOD signal by parsing, and by the PP1S signal compensation being produced accurate PP1S signal as the reference clock signal of system.Can be used for time synchronized through overcompensation PP1S reference clock signal later.
Need to prove, above preferred embodiment mainly is to propose at the synchronous problem of base station clock, but, also go for the situation that other needs the accurate benchmark clock signal, so, reduction apparatus described herein can be base station equipment, also can be the equipment of other type or device or the system that needs the accurate benchmark clock signal.
Because signal of telecommunication transmission range is distant, and can vary with temperature and the difference of delaying time in the cable transmission process, therefore, there are time delay error in the PP1S signal that reduction apparatus gets access to and the PP1S signal of integrated GPS receiver, this time delay error mainly comprises two partial contents, a part is the time-delay of reduction apparatus and far-end integration apparatus inside, comprise the cabling time-delay, protection class device parasitic capacitance effect is to signal lag, this time delay value is determined by the ardware feature of electronic device, and is generally comparatively fixing; The transmission line time-delay that differences such as a part is the distant signal line because length of cable in addition, specifications and models and environment difference cause, this two classes time-delay can be obtained by the measurement of Time delay measurement message.
This introduce preferred one by measuring the message measurement to obtain the processing mode of time delay error: Fig. 9 be PP1S compensation of delay schematic diagram according to the embodiment of the invention, as shown in Figure 9, after reduction apparatus and far-end integration apparatus have been set up link, reduction apparatus as main usefulness is measured message to far-end integration apparatus forward delay interval, and the record delivery time is Ta; GPS receiving equipment (being above-mentioned far-end integration apparatus) return time delay is measured response message, wherein, carry the difference of Tc and Tb in this latency measurement response message, Tc is for sending the moment of above-mentioned latency measurement response message, and Tb is the moment that receives above-mentioned latency measurement message; The reduction apparatus record receives the moment Td of latency measurement response message, and therefore, the calculation delay measured value is ((Td-Ta)-(Tc-Tb))/2.If reduction apparatus does not receive the latency measurement response message, then periodically send this latency measurement message, up to receiving the latency measurement response message.
After reduction apparatus obtains above-mentioned two time delay values, with two time delay value additions, utilize phase-locked loop that the PP1S signal is carried out delay compensation then, thereby obtain original PP1S signal accurately.PP1S signal after the compensation and the output of TOD signal namely can be used as reference clock signal, are used for time synchronized.
Because far-end integration apparatus and reduction apparatus need cable transmission, and the long-distance line cable often needs a cable and a set of equipment can support a plurality of reduction apparatus, Figure 10 is the schematic diagram of supporting a plurality of reduction apparatuss according to the far-end integration apparatus of the embodiment of the invention, as shown in figure 10, a far-end integration apparatus is supported a plurality of reduction apparatus by a cable and a set of equipment, for realizing this needs, in this preferred embodiment, provide following processing:
The TOD information of PP1S and reception is closed the road be placed on 500ms in the time, and the remaining 500ms time is used for doing response.Figure 11 closes road sequential schematic diagram according to the PP1S signal of the embodiment of the invention and TOD signal, as shown in figure 11, and A: receiver output PP1S signal; B: receiver output TOD signal; C: the pulse synchronous with receiver output PP1S; D: with the synchronous pulse of receiver output PP1S and TOD generation close the road signal; E: recover the PP1S signal; F: recover the TOD signal.
Figure 12 is the flow chart of reference clock signal processing method when supporting a plurality of reduction apparatus according to the far-end integration apparatus of the embodiment of the invention, and as shown in figure 12, this flow process comprises the steps:
Step S1202, reduction apparatus powers on, and unlatching support far-end integration apparatus function is set, namely working as reduction apparatus powers on, reduction apparatus determines whether to use the far-end integration apparatus to be used as reference clock signal, if with this as reference clock signal, then enter step S304;
Step S1204, the reduction apparatus opening power is the power supply of far-end integration apparatus, and waits for the main id signal of using that the far-end integration apparatus sends;
Step S1206, the far-end integration apparatus is inquired about reduction apparatus quantity in place and numbering, and the master control reduction apparatus is set, for example can adopt following processing mode: the far-end integration apparatus is by the mode of poll, 256 IP addresses of difference poll mantissa in 1S, if the IP address mantissa of reduction apparatus is consistent with the transmission of far-end integration apparatus, judge that then this equipment is as host apparatus (being the master control reduction apparatus).This host apparatus sends response signal to the far-end integration apparatus, and carries out link setup.
Step S1208, the master control reduction apparatus is finished far-end integration apparatus initialization flow process, namely after finishing link setup, main equipment is finished far-end integration apparatus relevant configuration and initialization, and far-end integration apparatus cycle transmission TOD signal and PP1S signal are to reduction apparatus;
Step S1210, reduction apparatus receive PP1S and TOD message is carried out time service, and namely reduction apparatus comes out the PP1S that receives and TOD signal resolution and adds that delayed data produces reference clock signal, is used for time synchronized.
Below in conjunction with accompanying drawing, be that the base station is that example describes with the reduction apparatus.Figure 13 is the flow chart that obtains the reference clock signal method according to the base station of the embodiment of the invention, and as shown in figure 13, this flow process comprises the steps:
Step S1302, the far-end integration apparatus receives the satellite gps signal by antenna, and carries out signal resolution and produce local TOD information and PP1S signal; Wherein the far-end integration apparatus can be selected at present commonly usedly, and the GNSS module that precision is higher is used for output TOD signal and PP1S signal.
Step S1304, the far-end integration apparatus closes the PP1S signal of output the road and goes to one road signal of telecommunication, and closes road to a piece with power supply.
Step S1306, reduction apparatus be power supply and signal decoupling zero, and then TOD signal and PP1S signal are separated.
Step S1308, the far-end integration apparatus sends the IP Address requests to reduction apparatus, leads with veneer with reduction apparatus and identifies.
Step S1310, the main veneer of using is measured message to far-end integration apparatus transmission delay, if receive the latency measurement signal response message of far-end integration apparatus, then finish to measure, and time delay information issued the far-end integration apparatus, the far-end integration apparatus sends after the PP1S all this delayed datas of transmission going along with at every turn, otherwise, transmission delay measuring-signal periodically;
Step S1312, reduction apparatus are according to delayed data, and the base station utilizes local phase-locked loop, and the PP1S signal is compensated, and the PP1S signal after the compensation is as reference clock signal.
The system that obtains of the reference clock signal of the embodiment of the invention, comprise the far-end integration apparatus, cable and the reduction apparatus that link to each other successively, this far-end integration apparatus is used for receiving gps signal, produce TOD signal and PP1S signal, above-mentioned TOD signal and PP1S signal converted to close the road signal, and after closing the road with power supply, send to reduction apparatus by twisted-pair feeder or coaxial cable.
This reduction apparatus be used for to receive TOD signal and PP1S signal, and the PP1S signal that receives is compensated, with the TOD signal that receives and the PP1S signal after the compensation as reference clock signal.
Preferably, this reduction apparatus also is used for utilizing local phase-locked loop, according to latency measurement value and conversion time delay sum, the PP1S signal is compensated.
This reduction apparatus also is used for judging the main base station equipment of using, and is used for sending relevant instruction to GPS receiving equipment (being the said distal ends integration apparatus).
This reduction apparatus also is used for to GPS receiving equipment transmission delay message, and calculates PP1S signal propagation delay time.
This GPS receiving equipment is used for sending message to reduction apparatus, informs above-mentioned conversion time delay.
Preferably, included far-end integration apparatus and the combination between the reduction apparatus have multiple in above-described embodiment and the preferred implementation, for example, can comprise Figure 14 a, Figure 14 b, Figure 14 c, four kinds of compound modes of Figure 14 d: Figure 14 a is the schematic diagram of supporting a reduction apparatus according to the far-end integration apparatus of the single-ended signal of the embodiment of the invention; Figure 14 b is the schematic diagram of supporting a plurality of reduction apparatuss according to the far-end integration apparatus of the single-ended signal of the embodiment of the invention; Figure 14 c is the schematic diagram of supporting a reduction apparatus according to the far-end integration apparatus of the differential signal of the embodiment of the invention; Figure 14 d is the schematic diagram of supporting a plurality of reduction apparatuss according to the far-end integration apparatus of the differential signal of the embodiment of the invention, need to prove, the embodiment of the invention includes but not limited to above-mentioned four kinds of typical case study on implementation.
Preferably, the said distal ends integration apparatus includes but not limited to zoom out the GPS receiver.Above-mentioned reduction apparatus also includes but not limited to base station equipment.Signal wherein also includes but not limited to TOD and PP1S signal, also comprises the signal that does not need to close the road.
By above-described embodiment and preferred implementation, can obtain the precise time synchronizing signal, to guarantee the operation of clock synchronization system, broken away from the gps antenna installation environment simultaneously, the restriction of extraneous factor, can expand GPS greatly as the range of application in clock reference synchronization source, reduced the difficulty of construction, installation cost and cable cost have been saved, reduced base station equipment to the requirement of the reception number that zooms out GPS, support a GPS equipment to support a plurality of base station equipments simultaneously, thereby further reduce the cost of system.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a reference clock signal processing method is characterized in that, comprising:
Receive the global navigation satellite system GNSS signal;
According to described GNSS signal generation timing signal and pps pulse per second signal;
Described time signal, pps pulse per second signal and the power supply that generates merged to one the tunnel be transferred to one or more reduction apparatuss, wherein, described one or more reduction apparatuss restore the pps pulse per second signal as described reference clock signal.
2. method according to claim 1, it is characterized in that, described time signal, pps pulse per second signal and the described power supply that generates merged to one the tunnel is transferred to described one or more reduction apparatus, wherein, the cable that merges to one tunnel transmission comprise following one of at least:
Power line, twisted-pair feeder, coaxial cable.
3. method according to claim 1 is characterized in that, under described reduction apparatus is a plurality of situation, the described time signal that will generate, pps pulse per second signal and described power supply merge to one the tunnel be transferred to described a plurality of reduction apparatus before, also comprise:
Determine that by the report for work mode of formula poll of reduction apparatus a master uses reduction apparatus from described a plurality of reduction apparatuss, wherein, described master is used for control far-end integration apparatus with reduction apparatus, is described time signal and described pps pulse per second signal with the signal of determining to send to described a plurality of reduction apparatuss with the power supply merging.
4. a reference clock signal processing method is characterized in that, comprising:
Reception from the merging of far-end integration apparatus time signal, pps pulse per second signal and power supply close the road signal, wherein, described far-end integration apparatus generates described time signal and pps pulse per second signal according to the global navigation satellite system GNSS signal that receives;
From the described pps pulse per second signal that restores the signal of road as described reference clock signal that closes that receives.
5. method according to claim 4 is characterized in that, from receive described close the pps pulse per second signal that restores the signal of road as described reference clock signal after, also comprise:
The described pps pulse per second signal that restores is carried out delay compensation.
6. method according to claim 5 is characterized in that, obtains the delay compensation that the described pps pulse per second signal that restores is carried out delay compensation in the following manner:
T=T1+T2, wherein, T is described delay compensation, and T1 is the internal delay time of both sides' equipment of the described pps pulse per second signal of transmission, and T2 is the time-delay of the transmission line between both sides' equipment of the described pps pulse per second signal of transmission.
7. method according to claim 6 is characterized in that, obtains described T1 and/or T2 in the following manner:
T1/T2=((Td-Ta)-(Tc-Tb))/2, wherein, an end that transmits the both sides of described pps pulse per second signal is measured message to other end forward delay interval, Ta is that an end sends the moment of measuring message, Tb is the moment that the other end receives this latency measurement message, Tc is the moment of other end transmission delay response message, and Td is the moment that a termination is received this time delay response message.
8. a reference clock signal processing unit is characterized in that, comprising:
First receiver module is used for receiving the global navigation satellite system GNSS signal;
Generation module is used for according to described GNSS signal generation timing signal and pps pulse per second signal;
Merge module, the described time signal, pps pulse per second signal and the power supply that are used for generating merge to one the tunnel and are transferred to one or more reduction apparatuss, and wherein, described one or more reduction apparatuss restore the pps pulse per second signal as described reference clock signal.
9. device according to claim 8 is characterized in that, also comprises:
Determination module, be used under described reduction apparatus is a plurality of situation, determine that by the report for work mode of formula poll of reduction apparatus a master uses reduction apparatus from described a plurality of reduction apparatuss, wherein, described master is used for control far-end integration apparatus with reduction apparatus, is described time signal and described pps pulse per second signal with the signal of determining to send to described a plurality of reduction apparatuss with the power supply merging.
10. a reference clock signal processing unit is characterized in that, comprising:
Second receiver module, what be used for to have received from the merging of far-end integration apparatus time signal, pps pulse per second signal and power supply closes the road signal, wherein, described far-end integration apparatus generates described time signal and pps pulse per second signal according to the global navigation satellite system GNSS signal that receives;
Recovery module is used for restoring pps pulse per second signal as described reference clock signal from the described road signal that closes that receives.
11. device according to claim 10 is characterized in that, also comprises:
Compensating module is used for the described pps pulse per second signal that restores is carried out delay compensation.
12. device according to claim 11 is characterized in that, described compensating module comprises:
Acquiring unit, be used for obtaining in the following manner the delay compensation that the described pps pulse per second signal that restores is carried out delay compensation: T=T1+T2, wherein, T is described delay compensation, T1 is the internal delay time of both sides' equipment of the described pps pulse per second signal of transmission, and T2 is the time-delay of the transmission line between both sides' equipment of the described pps pulse per second signal of transmission.
13. device according to claim 12 is characterized in that, described acquiring unit comprises:
Obtain subelement: be used for obtaining in the following manner described T1 and/or T2, T1/T2=((Td-Ta)-(Tc-Tb))/2, wherein, an end that transmits the both sides of described pps pulse per second signal is measured message to other end forward delay interval, Ta is that an end sends the moment of measuring message, Tb is the moment that the other end receives this latency measurement message, and Tc is the moment of other end transmission delay response message, and Td is the moment that a termination is received this time delay response message.
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| CN103686990A (en) * | 2013-12-10 | 2014-03-26 | 北京北方烽火科技有限公司 | Device for achieving clock synchronization |
| CN103840933A (en) * | 2013-12-10 | 2014-06-04 | 北京北方烽火科技有限公司 | Method and switch for achieving clock synchronization |
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| CN110601787A (en) * | 2019-10-16 | 2019-12-20 | 深圳市友华通信技术有限公司 | OLT (optical line terminal) equipment and clock synchronization method thereof |
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| CN112468247A (en) * | 2020-12-16 | 2021-03-09 | 深圳市佳贤通信设备有限公司 | Automatic measurement system and method for RRU link time delay of 5G base station |
| CN113015235A (en) * | 2021-01-27 | 2021-06-22 | 北京方天鸿瑞科技有限公司 | Clock synchronization equipment and system from bottom to top |
| CN113015235B (en) * | 2021-01-27 | 2023-08-04 | 北京方天鸿瑞科技有限公司 | Bottom-up clock synchronization device and system |
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