CN100546228C - Common frequency optical fiber repeater for railway - Google Patents
Common frequency optical fiber repeater for railway Download PDFInfo
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- CN100546228C CN100546228C CNB2006100383362A CN200610038336A CN100546228C CN 100546228 C CN100546228 C CN 100546228C CN B2006100383362 A CNB2006100383362 A CN B2006100383362A CN 200610038336 A CN200610038336 A CN 200610038336A CN 100546228 C CN100546228 C CN 100546228C
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Abstract
The invention discloses a kind of common frequency optical fiber repeater for railway, it comprises remote termination, near-end machine, connects the optical fiber and the retransmitting antenna of remote termination and near-end machine; Utilization is separately positioned on the up-downgoing of the control module coordination control signal on near-end machine and the remote termination, and carries out the switching of up-downgoing passage by radio-frequency (RF) switch, has effectively prevented to have guaranteed system stability work with the interference of communication frequently; Control module is provided with remote communication interface, can carry out telemonitoring, control to near-end machine and remote termination by the remote-control romote-sensing communication system, near-end machine control module is provided with thresholding control to upward signal, the remote termination control module is provided with thresholding control to downstream signal, to improve both anti-jamming capacity; The present invention can adapt to the existing row of railway and transfer single duplex system, four group or independent standard such as synchronous frequently, does not change original train dispatch radio communication function in service and equipment, provides full impregnated bright communications.
Description
One, technical field
The present invention relates to a kind of repeater equipment that the blind area covers, specifically a kind of common frequency optical fiber repeater for railway of being used in the communications field.
Two, background technology
Radio communication is the important communication means of railway transportation commander and operation, because China's complicated topographical conditions, trunk railway is mostly through mountain area, plateau or valley, the tunnel gathers, ravines and guillies criss-cross, exist the weak district of large-area signal of communication blind area or signal, can't satisfy the demand of these district railway communications.The investment of mobile communication base station is huge, and the environmental requirement height to the setting area is confined to the restriction of cost of investment, construction period and orographic condition, can not build in a large number it; And that the repeater has an investment is little, and the construction period is fast, speech quality good, advantages such as system's strong anti-interference performance, and therefore adopting the repeater is that the best feeble field in present railway communication field is mended blind mode.
Present repeater mainly contains wireless discharging-directly station and optical fiber repeater (Fiber Reapeter) two classes, low being easy to of wireless discharging-directly station equipment cost installed, be particularly suited for emergency communication, be that communication is mended blind, the method that the increase coverage territory is the easiest, but operation principle according to wireless discharging-directly station, wireless discharging-directly station needs donor antenna is installed in the place that can receive base station (BTS) signal of communication, and received signal intensity can not be less than-80dBm, so wireless discharging-directly station generally can only be installed in the edge of base station range, and to the direction extension covering that covers along the base station; Simultaneously, in order to prevent straight-forward station self-excitation, need guarantee that also donor antenna and cover antenna have enough isolations.Therefore, the installation site and the mode of wireless discharging-directly station are subjected to certain limitation, and its coverage is less.Optical fiber repeater mainly is made up of near-end machine (Master), remote termination (Slaver Reapeter), retransmitting antenna etc., wherein be connected by optical fiber between near-end machine and the remote termination, its downlink working mode is: the radiofrequency signal of near-end machine coupling base station, by optical transceiver (OET) radiofrequency signal is carried out electricity/light conversion after Optical Fiber Transmission to remote termination; Remote termination receives the signal from the near-end machine, through light/descending amplifier module of electricity conversion back input downstream signal is amplified, and exports retransmitting antenna to, covers required space, reaches the purpose of forward signal coverage hole; Up working method is: retransmitting antenna sends remote termination to by radio frequency cable after receiving the upward signal of travelling carriage, signal is by the remote termination upstream components, carry out electricity/light conversion by optical transceiver, be transmitted through the fiber to the near-end machine then, the near-end machine carries out signal to be coupled to the base station after light/electricity conversion, set up the uplink communication link of signal blind zone or weak signal area with this, guarantee that signal blind zone or weak signal area can normal talkings.Remote termination was installed in the no signal area when optical fiber direct amplification stood in application; And need not to consider the transmitting-receiving isolating problem, addressing is convenient.Radiofrequency signal can be sent under the situation of very little transmission loss and far reach 20 kilometers distant place in addition, and optical cable is very thin, lays easily.Therefore, the flexibility of design and construction is big.
The existing optical fiber repeater that is used for railway is all worked in the alien frequencies mode at present, and is applied to use the railway of pilot frequency communication facility along the line, its downstream frequency 467-469MHz; Upstream frequency 457-459MHz.But, still a large amount of employing the on a lot of railway lines of China with the frequency communication mode, its up-downgoing frequency all is 457-459MHz, can't adopt the alien frequencies optical fiber repeater for such railway line, needs a kind of common frequency optical fiber repeater to carry out the feeble field district and covers.
Three, summary of the invention
The purpose of this invention is to provide a kind of common frequency optical fiber repeater that railway communication feeble field district covers requirement that satisfies, standards such as this repeater can adapt to the existing train dispatch radio communication list duplex system of railway, four frequencies are organized or independently synchronous, and do not change operating original train dispatch radio communication equipment and function, provide full impregnated bright communications.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of common frequency optical fiber repeater for railway is characterized in that: it comprises remote termination, near-end machine, connects the optical fiber and the retransmitting antenna of remote termination and near-end machine;
Wherein the near-end machine comprises near-end control module, optical transceiver (A), near end signal detection module and near-end radio-frequency (RF) switch, the near-end control module connects near-end radio-frequency (RF) switch, optical transceiver (A) and near end signal detection module respectively by data/address bus, is used for being connected optical transceiver (A) by a data feedback channel with a down going channel respectively with the near-end radio-frequency (RF) switch of base station communication; The near end signal detection module is located at the data feedback channel between near-end radio-frequency (RF) switch and the optical transceiver (A), and optical transceiver (A) is connected with optical transceiver (B) on the remote termination to transmit signal by optical fiber;
Remote termination comprises far-end control module, far end radio frequency switch, optical transceiver (B), remote signaling detection module, low noise amplifier (low noise amplifier) and power amplifier (power magnifier), the far-end control module connects far end radio frequency switch, optical transceiver (B), low noise amplifier and power amplifier respectively by data/address bus, and optical transceiver (B) is connected the far end radio frequency switch by a data feedback channel with a down going channel respectively; Remote signaling detection module, low noise amplifier are serially connected in the down going channel between optical transceiver (B) and the far end radio frequency switch, power amplifier is located at the data feedback channel between far end radio frequency switch and the optical transceiver (B), and the far end radio frequency switch connects the retransmitting antenna with mobile communications.
The near-end control module is connected the remote-control romote-sensing main frame respectively with the far-end control module, is used for remote monitoring near-end machine
Operating state with remote termination.It possesses protection, warning function, in case near-end machine or remote termination work are undesired, control module can be reported telemetry host computer.
Optical transceiver on the near-end machine is provided with one group of optical interface, can insert many with the frequency remote termination.
Operation principle:
When not having signal to enter, the radio-frequency (RF) switch of near-end machine is to connect down going channel; The radio-frequency (RF) switch of remote termination is to connect data feedback channel.
The downlink working process: after station console (base station) transmitted, signal was connected to near-end machine down going channel through the radio-frequency (RF) switch of near-end machine, and was sent to the down going channel of remote termination by optical fiber by optical transceiver A.The remote termination signal detection module detect descending signal input is arranged after, report the far-end control module immediately, this control module is closed the low noise amplifier in the data feedback channel, and open the down going channel power amplifier, and arrive the far end radio frequency switch transition descending, signal is outputed to retransmitting antenna, and signal is passed to travelling carriage or locomotive platform by retransmitting antenna.
The up course of work: when the signal of travelling carriage or locomotive platform emission enters remote termination by retransmitting antenna, because of the default conditions of far end radio frequency switch are to connect data feedback channel, so signal directly is connected to the data feedback channel of remote termination through the far end radio frequency switch, after low noise amplifier amplifies signal, import optical transceiver B again, signal is delivered to the data feedback channel of near-end machine by optical fiber.After the near end signal detection module detects data feedback channel signal input is arranged, report the near-end control module immediately, then the near-end control module nearly end-fire switch transition is to up frequently, signal outputs to station console (base station) through radio-frequency (RF) switch.
Closely, all have signal detection module in the remote termination, can know by signal detection module whether passage has signal to come in, more whether the size of detection signal reaches set-point simultaneously, and produces signal thus and give control module.Signal detection module can also upload to control module to detected signal level by port.
Low noise amplifier in the remote termination is normal the amplification at ordinary times, as downstream signal, after descending power amplifier is opened, because of the isolation of radio-frequency (RF) switch not enough, still have the part downstream signal and enter low noise amplifier, therefore by the far-end control module low noise amplifier cuts out this moment, stop signal to enter data feedback channel.
The present invention compared with prior art has the following advantages: (1) can adapt to the existing row of railway and transfer single duplex system, four group or independent standard such as synchronous frequently, does not change original train dispatch radio communication function in service and equipment, provides full impregnated bright communications; (2) utilize the control module that is separately positioned on near-end machine and the remote termination to coordinate the up-downgoing of control signal, carry out the switching of up-downgoing passage, effectively prevented to have guaranteed system stability work with the interference of communication frequently by radio-frequency (RF) switch; (3) on the control module of near-end machine and remote termination, be respectively equipped with remote communication interface, can carry out telemonitoring, control to near-end machine and remote termination by the remote-control romote-sensing communication system, recognize whether module work is normal, and make it to possess protection, warning function, in case near-end machine and/or remote termination work are undesired, control module can be reported main frame immediately; (4) the near-end control module is provided with thresholding control to upward signal, and the far-end control module is provided with thresholding control to downstream signal, to improve both anti-jamming capacity; (5) near-end machines can be with many with the frequency remote termination, effectively reduce cost.
Four, description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the workflow diagram of remote termination among the present invention;
Fig. 3 is the workflow diagram of near-end machine among the present invention.
Five, embodiment
As shown in Figure 1, a kind of common frequency optical fiber repeater for railway of the present invention comprises remote termination, near-end machine, connects the optical fiber and the retransmitting antenna of remote termination and near-end machine;
Wherein the near-end machine comprises near-end control module, optical transceiver A, near end signal detection module and near-end radio-frequency (RF) switch, the near-end control module connects near-end radio-frequency (RF) switch, optical transceiver A and near end signal detection module respectively by data/address bus, is used for being connected optical transceiver A by a data feedback channel with a down going channel respectively with the near-end radio-frequency (RF) switch of base station communication; The near end signal detection module is located at the data feedback channel between near-end radio-frequency (RF) switch and the optical transceiver A, and optical transceiver A is connected with optical transceiver B on the remote termination to transmit signal by optical fiber, and optical transceiver A is provided with one group of optical interface, can insert many with remote terminations frequently.；
Remote termination comprises far-end control module, far end radio frequency switch, optical transceiver B, remote signaling detection module, low noise amplifier and power amplifier, the far-end control module connects far end radio frequency switch, optical transceiver B, low noise amplifier and power amplifier respectively by data/address bus, and optical transceiver B is connected the far end radio frequency switch by a data feedback channel with a down going channel respectively; Remote signaling detection module, low noise amplifier are serially connected in the down going channel between optical transceiver B and the far end radio frequency switch, power amplifier is located at the data feedback channel between far end radio frequency switch and the optical transceiver B, and the far end radio frequency switch connects the retransmitting antenna with mobile communications.
Functions such as that the signal detection module in above-mentioned near, the remote termination has is highly sensitive, high stable and 2MHz Broadband Detection.Can know by this detection module whether passage has signal to come in, more whether the size of detection signal reaches set-point simultaneously, and produces control signal thus to control module.Signal detection module can also upload to control module to detected signal level by port.
Radio-frequency (RF) switch is the critical component that switches the up-downgoing passage, adopts high-power PIN device, and guarantees that the power greater than 10 watts passes through, and switching time is less than 20ns simultaneously.
The near-end control module also is connected the Remote telemetry host computer respectively with the far-end control module; the operating state that is used for remote monitoring near-end machine and remote termination; it possesses protection, warning function, in case near-end machine or remote termination work are undesired, control module can be reported telemetry host computer.
The workflow of remote termination (Fig. 2): at first, each module of initialization, when not having signal to enter, the radio-frequency (RF) switch of remote termination is to connect data feedback channel.When the remote signaling detection module detects descending when signal is arranged, notice far-end control module, close low noise amplifier by the far-end control module, and with the far end radio frequency switch transition to down going channel, behind time-delay a period of time such as the 100us, notice power is sent out device big and is opened, power is sent out device big and is provided with threshold switch, close power during less than the threshold setting value when input signal and send out device big, input signal is then opened during greater than the threshold setting value, when power sends out the device opening time big greater than preset value as three minutes no signals still, then explanation is broken down, and the far-end control module is closed that power sends out device big and reported to the police to the remote-control romote-sensing main frame, when power sends out the device opening time big less than preset value, detect the descending signal that whether has, previous step is rapid if any then returning, and sends out device big as then not closing power, delays time a period of time afterwards, far-end control module notice far end radio frequency switch reconnects data feedback channel, and opens low noise amplifier.And when upward signal, because of the default conditions of remote termination are that data feedback channel is in open mode, so upward signal is directly sent into the near-end machine through low noise amplifier, optical transceiver B.
The workflow of near-end machine (Fig. 3): at first, each module of initialization, when not having signal to enter, the radio-frequency (RF) switch of near-end machine is to connect down going channel.When the near end signal detection module detect up when signal is arranged, notice near-end control module, by the near-end control module nearly end-fire switch transition is to data feedback channel frequently, upward signal is entered through radio-frequency (RF) switch by optical transceiver A and delivers to station console (base station).The near-end radio-frequency (RF) switch is provided with thresholding control to upward signal, when input signal during less than the threshold setting value radio-frequency (RF) switch be failure to actuate, input signal then is converted to data feedback channel during greater than the threshold setting value, when the near-end radio-frequency (RF) switch opening time greater than preset value no signal still, then explanation is broken down, the near-end control module is reported to the police to telemetry host computer, when the near-end radio-frequency (RF) switch opening time less than preset value, judge the up signal that whether has, rapid if any then returning previous step, after a period of time of then not delaying time, near-end control module notice near-end radio-frequency (RF) switch reconnects down going channel.And when downstream signal, because of the default conditions of near-end machine are that down going channel is in open mode, so downstream signal is directly sent into remote termination through near-end radio-frequency (RF) switch, optical transceiver A.
The effect of optical fiber repeater is similar in the feeble field district and has built up a base station, and the main effect of near-end machine is from the base station pickoff signals, and the signal of also the remote termination relaying being come simultaneously sends the base station to.The main effect of remote termination is to guarantee that the field intensity in feeble field district covers, and the base station down signal is carried out power amplification, comes travelling carriage upward signal to be uploaded to the base station simultaneously, and it is the capital equipment of optical fiber repeater covering system.Connect by optical fiber between near-end machine and the remote termination, adopt the optical fibre wavelength-division multiplex technology, every remote termination only needs an optical fiber to be connected with the near-end machine, the light window of descending use 1310nm wavelength, the light window of up use 1550nm wavelength.It is optical transceiver that light modulation demodulation function equipment is provided, and optical transceiver provides uplink and downlink two transparent radio-frequency transmission channels, and the Rfin signal is modulated to optical transmitting set (LD); Optical receiver (PD) is reduced to Rfout to the signal that is modulated on the light.Through after the light modulation demodulation, the bottom noise level of output is than higher, and in order to guarantee the signal to noise ratio of signal, the level of RF signals of input should be greater than-50dBm.
Claims (3)
1, a kind of common frequency optical fiber repeater for railway is characterized in that: it comprises remote termination, near-end machine, connects the optical fiber and the retransmitting antenna of remote termination and near-end machine;
Wherein the near-end machine comprises near-end control module, optical transceiver (A), near end signal detection module and near-end radio-frequency (RF) switch, the near-end control module connects near-end radio-frequency (RF) switch, optical transceiver (A) and near end signal detection module respectively by data/address bus, is used for being connected optical transceiver (A) by a data feedback channel with a down going channel respectively with the near-end radio-frequency (RF) switch of base station communication; The near end signal detection module is located at the data feedback channel between near-end radio-frequency (RF) switch and the optical transceiver (A), and optical transceiver (A) is connected with optical transceiver (B) on the remote termination to transmit signal by optical fiber;
Remote termination comprises far-end control module, far end radio frequency switch, optical transceiver (B), remote signaling detection module, low noise amplifier and power amplifier, the far-end control module connects far end radio frequency switch, optical transceiver (B), low noise amplifier and power amplifier respectively by data/address bus, and optical transceiver (B) is connected the far end radio frequency switch by a data feedback channel with a down going channel respectively; Remote signaling detection module, low noise amplifier are serially connected in the down going channel between optical transceiver (B) and the far end radio frequency switch, power amplifier is located at the data feedback channel between far end radio frequency switch and the optical transceiver (B), and the far end radio frequency switch connects the retransmitting antenna with mobile communications.
2, according to the described common frequency optical fiber repeater for railway of claim 1, it is characterized in that: the near-end control module is connected the remote-control romote-sensing main frame that is used for remote monitoring near-end machine and remote termination working condition respectively with the far-end control module.
3, according to the described common frequency optical fiber repeater for railway of claim 1, it is characterized in that: optical transceiver (A) be provided with one group can with the continuous optical interface of corresponding optical transceiver (B).
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| CNB2006100383362A CN100546228C (en) | 2006-02-17 | 2006-02-17 | Common frequency optical fiber repeater for railway |
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| CNB2006100383362A CN100546228C (en) | 2006-02-17 | 2006-02-17 | Common frequency optical fiber repeater for railway |
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| CN100546228C true CN100546228C (en) | 2009-09-30 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282180B (en) * | 2007-04-04 | 2011-02-02 | 泉州市铁通电子设备有限公司 | Optical fiber direct transport station with common/different-frequency forwarding function |
| CN101651498B (en) * | 2009-08-28 | 2012-05-23 | 深圳市云海通讯股份有限公司 | Repeater and method for removing pilot frequency pollution by same |
| CN109379141B (en) * | 2018-11-21 | 2021-02-23 | 广州飞瑞敖电子科技股份有限公司 | Time division duplex radio over fiber transmission system |
| CN113359085A (en) * | 2021-06-01 | 2021-09-07 | 四川中电昆辰科技有限公司 | High-isolation time division multiplexing multichannel receiver and receiving method |
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| CN1457160A (en) * | 2002-12-31 | 2003-11-19 | 北京信威通信技术股份有限公司 | Direct transmitting station for synchronous CDMA system and its control |
| CN2643580Y (en) * | 2003-09-19 | 2004-09-22 | 福建电信科学技术研究院有限公司 | Optical fibre direct-broadcasting station for 3G mobile communication |
| CN1716825A (en) * | 2005-08-12 | 2006-01-04 | 京信通信技术(广州)有限公司 | Mobile communication digital optical fiber direct distribution station using daisy chain driving structure |
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2006
- 2006-02-17 CN CNB2006100383362A patent/CN100546228C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1457160A (en) * | 2002-12-31 | 2003-11-19 | 北京信威通信技术股份有限公司 | Direct transmitting station for synchronous CDMA system and its control |
| CN2643580Y (en) * | 2003-09-19 | 2004-09-22 | 福建电信科学技术研究院有限公司 | Optical fibre direct-broadcasting station for 3G mobile communication |
| CN1716825A (en) * | 2005-08-12 | 2006-01-04 | 京信通信技术(广州)有限公司 | Mobile communication digital optical fiber direct distribution station using daisy chain driving structure |
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Denomination of invention: Common frequency optical fiber repeater for railway Effective date of registration: 20120522 Granted publication date: 20090930 Pledgee: Bank of Nanjing, Zhujiang branch, Limited by Share Ltd Pledgor: Nanjing Taitong S & T Co., Ltd. Registration number: 2012990000224 |
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Owner name: NANJING TICOM TECHNOLOGY CO., LTD. Free format text: FORMER NAME: NANJING TAITONG S + T CO., LTD. |
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Address after: 210037, 35, Hui Feng Avenue, Yuhuatai Economic Development Zone, Nanjing, Jiangsu Patentee after: NANJING TICOM TECH CO., LTD. Address before: Nanjing City, Jiangsu province 210037 Luxi Camp No. 97 Patentee before: Nanjing Taitong S & T Co., Ltd. |