CN211720556U - Free space light multi-beam diversity transmitting device for high-speed railway - Google Patents
Free space light multi-beam diversity transmitting device for high-speed railway Download PDFInfo
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- CN211720556U CN211720556U CN202020951036.9U CN202020951036U CN211720556U CN 211720556 U CN211720556 U CN 211720556U CN 202020951036 U CN202020951036 U CN 202020951036U CN 211720556 U CN211720556 U CN 211720556U
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Abstract
The utility model relates to the technical field of railway communication, in particular to a free space light multi-beam diversity transmitting device for a high-speed railway, which comprises a signal box and a light transmitting device; one or more light receiving devices are arranged on the outer side of the top of each train carriage, two or more light emitting devices are arranged on a cross arm of each contact net rigid crossing strut above a rail, and a signal box is arranged on any one of every N contact net rigid crossing struts. The utility model discloses make the light beam direct radiation of light emission device transmission on railway carriage top lateral surface, compare in prior art and will install by the rail with regard to the laser instrument, reduced light beam propagation distance, reduce the influence of atmospheric attenuation to the light beam. And a plurality of free space optical signals are received by the optical receiving device through the multi-beam diversity technology by using different channels, and the optical receiving device integrates the received optical signals to obtain the optical signal with the best performance, thereby reducing the attenuation generated in the transmission process.
Description
Technical Field
The utility model relates to a railway communication technology field is a high-speed railway free space light multi-beam diversity emitter.
Background
The existing high-speed railway wireless communication can be realized by a radio frequency signal communication system, an optical communication system and the like, the radio frequency signal communication mode is easy to be interfered by signals of stations or cells along the periphery and special signals of railways such as GSM-R and the like, a large base station needs to be built, the cost of construction and later maintenance are very high, the free space optical communication system has the advantages of high bandwidth, low delay, good confidentiality and the like, high-speed communication can be provided for high-speed railway users, the communication of the users along the railway is not influenced, and the cost of the free space optical communication system is low compared with the construction cost and the later maintenance cost of the large base station.
In a free space optical communication system, alignment of light beams is required to ensure that a communication link is in normal communication. The light emitter in the existing free space optical communication system of the high-speed railway is usually installed beside a rail, which undoubtedly increases the propagation distance of the light beam, so that the signal attenuation is more serious, and the light beam propagation distance is easily influenced by small-amplitude oscillation of the transmitting and receiving end under the condition of alignment for a long time, for example, when the vehicle body passes through a curve or a mountain area at high speed, the vehicle body is shifted in a small range, and when the vehicle body is shifted in an up-down, left-right direction, the light beam center and the detector center are likely to be shifted. When the offset occurs, the received power varies, and when the offset occurs, the link is disconnected. And single optical signal transmitting and receiving methods are adopted in the existing high-speed rail free space optical communication system, signals are easily affected by environmental factors such as sunlight, rain, snow, haze and the like, meanwhile, the number of free space optical signal interference sources is large, and when single light passes through one channel, signal attenuation is serious. A single channel is very susceptible to other interference sources, and a receiving end can only receive one free-space optical signal of a damaged end.
Disclosure of Invention
The utility model provides a high-speed railway free space light multi-beam diversity emitter has overcome above-mentioned prior art not enough, and it can effectively solve current railway free space optical communication system and install the light emitter commonly and cause the light beam propagation distance to increase at the rail side, problem that the signal attenuation is serious. The problem that signal attenuation is caused due to the fact that an existing railway free space optical communication system is easily interfered by the environment in a single optical signal transmitting and receiving mode is further solved.
The technical scheme of the utility model is realized through following measure: a high-speed railway free space light multi-beam diversity transmitting device comprises a data center, a plurality of signal boxes, a plurality of light emitting devices, a plurality of light receiving devices and a plurality of power dividers; one or more light receiving devices are arranged on the outer side of the top of each train carriage, and a power divider and two or more light emitting devices are arranged on each cross arm of the hard crossing strut of the contact network above the rail; a signal box is arranged on any one of the N hard crossing struts of the contact network, and each signal box is connected with all power dividers arranged on cross arms of the hard crossing struts of the contact network of the corresponding N hard crossing struts; the data center is connected with the signal box through a cable, the signal box is connected with the corresponding power divider, the power divider is connected with all light emitting devices on the cross arm of the hard crossing strut of the overhead contact system where the power divider is located, and the light emitting devices are connected with the light receiving devices.
The following are further optimization or/and improvement of the technical scheme of the utility model:
the light emitting device comprises a modulator and a laser; the modulator is connected to the laser.
The signal box comprises a box body, and a serial-parallel conversion module is arranged in the box body.
The light receiving device comprises a photoelectric detector, a low-pass filter and a synthesizer; the photoelectric detector is connected with the low-pass filter, and the low-pass filter is connected with the synthesizer.
The light emitting device is arranged below the cross arm of the hard crossing strut of the contact net through a fixing piece.
The light beam emitted by the light emitting device covers a distance of 25 m.
The utility model discloses utilize the contact net to span pillar and wavelength division multiplexing mode firmly and establish high-speed railway free space light multi-beam diversity emitter, compare in current with light emitter install beside the rail, reduced light beam propagation distance, reduced the influence of atmospheric attenuation to the light beam, when the train moves simultaneously, because propagation distance reduces, the influence of the irregular shock of train to the light beam has been reduced to span the pillar firmly with the help of the contact net, need not to produce extra economic cost, communication system operating cost has been reduced. And the utility model discloses two or a plurality of free space light signals of light emission device transmission on the same contact net hard span pillar xarm, and a plurality of free space light signals's wavelength is the same, the loading information is the same, produce overlap area between a plurality of free space light signals, make a plurality of free space light signals use different channels to be received by light receiving device through multibeam diversity technique, light receiving device integrates received light signal, obtain the best light signal of performance, thereby the decay that transmission process produced has been reduced.
Drawings
Fig. 1 is a schematic view of the structure installation of the present invention.
Fig. 2 is a schematic diagram of a circuit structure of the present invention.
Fig. 3 is another schematic circuit structure of the present invention.
Fig. 4 is a schematic circuit structure diagram of the power divider of the present invention.
Fig. 5 is a schematic circuit diagram of the light emitting device of the present invention.
Fig. 6 is a schematic diagram of another circuit structure of the light emitting device of the present invention.
Fig. 7 is a schematic diagram of a circuit structure of the optical receiver according to the present invention.
The codes in the figures are respectively: the device comprises a data center 1, a signal box 2, a light emitting device 3, a light receiving device 4, a train carriage 5, a cross arm of a hard crossing strut of a contact network 6, a cable 7, a fixing piece 8, a power divider 9 and a hard crossing strut of the contact network 10.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 in the specification.
The invention will be further described with reference to the following examples and drawings:
as shown in fig. 1, 2, 3 and 4, the high-speed railway free-space optical multi-beam diversity transmitting device comprises a data center 1, a plurality of signal boxes 2, a plurality of light emitting devices 3, a plurality of light receiving devices 4 and a plurality of power dividers 9; one or more light receiving devices 4 are arranged on the outer side of the top of each train carriage 5, and a power divider 9 and two or more light emitting devices 3 are arranged on each cross arm 6 of the hard crossing strut of the contact network above the rail; a signal box 2 is arranged on any one of the N hard cross struts 10 of the contact network, and each signal box 2 is connected with all power dividers 9 arranged on the cross arms 6 of the hard cross struts 10 of the contact network corresponding to the N hard cross struts 10 of the contact network; the data center 1 is connected with the signal box 2 through a cable 7, the signal box 2 is connected with the corresponding power divider 9, the power divider 9 is connected with all the light emitting devices 3 on the cross arm 6 of the hard crossing strut of the overhead contact system where the power divider is located, and the light emitting devices 3 are connected with the light receiving devices 4.
The utility model discloses an above-mentioned technical scheme utilizes the contact net to span pillar 10 firmly and the wave division multiplexing mode establishes high-speed railway free space light multi-beam diversity emitter, all set up two or more light emitter 3 on spanning pillar xarm 6 through every contact net above the rail promptly, make the light beam direct radiation of light emitter 3 transmission on 5 top lateral surfaces of railway carriage, compare in current and install light emitter 3 beside the rail, the light beam propagation distance has been reduced, the influence of atmospheric attenuation to the light beam has been reduced, when the train moves, because the propagation distance reduces, the influence of the irregular shock of train to the light beam has been reduced, and span pillar 10 firmly with the help of the contact net, need not to produce extra economic cost, communication system operating cost has been reduced. And one or more light receiving devices 4 are arranged on the outer side of the top of each railway carriage 5, so that tracking and aiming of light beams are not required, high-precision equipment required by tracking and aiming is not required to be installed, and the system construction cost is reduced.
The utility model discloses two or more light emitting device 3 on same contact net hard span pillar xarm 6 transmit a plurality of free space light signal (be a plurality of free space light beam), and the wavelength of a plurality of free space light signal is the same, the loading information is the same, produce the overlap region between a plurality of free space light signal, make a plurality of free space light signal use different channels through multibeam diversity technique to be received by light receiving device 4, light receiving device 4 integrates received light signal, obtain the best light signal of performance, thereby the decay that transmission process produced has been reduced. Compared with a single optical signal transmitting, covering and receiving method, the optical signal is very susceptible to environmental factors such as sunlight, rain, snow, haze and the like, the original optical signal cannot be completely recovered, and the influence of interference sources such as turbulence, haze, rain and the like on the free space optical signal is compensated.
The data center 1 may be a parallel/serial module, which may be installed at a remote end and is configured to combine multiple data streams into one combined data stream, and send the combined data stream to each signal box 2 through a cable 7.
As described above, one signal box 2 is provided on any one of the N hard crossing struts 10 of the contact network, and each hard crossing strut 10 of the contact network has one cross arm 6 of the hard crossing strut, so that each signal box 2 is connected to all power dividers 9 provided on the corresponding N hard crossing strut cross arms 6 of the contact network, and each power divider 9 is connected to all light emitting devices 3 on the cross arm 6 of the hard crossing strut of the contact network where the power divider 9 is located, where N is set according to actual conditions and the device capabilities of the signal box 2, for example: as shown in the accompanying drawings 2 and 3, the utility model discloses preferential setting N to 3, set up a signal box 2 on the pillar 10 is striden firmly to arbitrary one contact net that spanes firmly in every 3 contact nets promptly, this signal box 2 is connected with all merit branch wares 9 that 3 contact nets that correspond set up on the pillar xarm 6 firmly, every merit divides ware 9 to correspond 2 optical transmission device 3, signal box 2 receives high-speed amalgamation data stream signal all the way, all turn into three routes low-speed data stream with high-speed amalgamation data stream all the way, three routes low-speed data stream sends respectively to 3 merit branch wares 9 that correspond, every merit divides ware 9 to divide into two the same low-speed data stream of the way low-speed data stream, and send respectively to corresponding optical transmission device 3, make above-mentioned 2 optical transmission device 3 send and carry the same information and the same light beam of wavelength.
The light emitting devices 3 can be fixed below a cross arm of a hard spanning strut 10 of the overhead line system by fixing parts 8 (such as steel pipe struts), each light emitting device 3 can be a rotatable light emitter, by adjusting the elevation angle of the rotatable light emitter, the coverage range of the light beam is determined and the alignment with the light receiving device 4 is realized, the rotatable phototransmitter can have an elevation angle adjustment range of 0 to 120 degrees, can be the rotatable phototransmitter mentioned in the 2017 Massachusetts Lincoln laboratories in IEEE International conference on Space Optical Systems and Application paper, the light beam emitted by the rotatable light emitter covers the roof of the railway carriage 5, the length of the covering distance can be set according to the length of each railway carriage 5, currently, the length of each railway carriage 5 is 25m at most, the length of the beam coverage distance emitted by the rotatable light emitter of the present invention may be 25 m.
The power divider 9 is a conventional power divider, and its specific structure is shown in fig. 4.
The free space light multi-beam diversity transmitting device for the high-speed railway can be further optimized or/and improved according to actual needs:
as shown in fig. 2, 3, 5 and 6, the light emitting device 3 includes a modulator and a laser; the modulator is connected to the laser.
In the above technical solution, the modulator may be an internal modulator or an external modulator. As shown in fig. 5, the internal modulator includes an analog-to-digital converter, an amplifier, and a dc offset, which are connected in sequence; the analog-to-digital conversion module converts the analog signal into a digital signal, and the digital signal is subjected to direct current bias after being amplified by the amplifier. As shown in fig. 6, the external modulator includes a polarizer and an electro-optic crystal; the light beam is polarized by the polarizer to generate a polarized light beam, and when the data stream is loaded to the electro-optic crystal, the refractive index of the crystal is changed to modulate the phase of the polarized light beam.
For example, as shown in fig. 2, the modulators are internal modulators, each power divider 9 corresponds to 2 light emitting devices 3, the power divider 9 obtains one low-speed data stream, divides the one low-speed data stream into two low-speed data streams, and sends the two low-speed data streams to the corresponding 2 internal modulators, each internal modulator modulates the received low-speed data stream, and sends the modulated low-speed data stream to a laser, and the laser emits a light beam with the data stream.
For example, as shown in fig. 3, the modulators are external modulators, each power divider 9 corresponds to 2 light emitting devices 3, the power divider 9 obtains one low-speed data stream, divides the one low-speed data stream into two low-speed data streams, and sends the two low-speed data streams to the corresponding 2 external modulators, each laser emits a light beam, and each external modulator modulates the light beam and the received low-speed data stream to obtain a light beam with a data stream.
As shown in fig. 1, 2 and 3, the signal box 2 includes a box body, and a serial-parallel conversion module is disposed in the box body.
In the above technical solution, the serial-to-parallel conversion module is a known technology in the prior art, and is used for converting all one path of high-speed data stream into multiple paths of low-speed data streams.
As shown in fig. 7, the light receiving device 4 includes a photodetector, a low-pass filter, and a combiner; the photoelectric detector is connected with the low-pass filter, and the low-pass filter is connected with the synthesizer.
In the technical scheme, the photoelectric detector, the low-pass filter and the synthesizer are all the prior known technologies, the photoelectric detector detects an optical signal and converts the optical signal into an electrical signal, the noise is filtered by the low-pass filter to form a required electrical signal, and the synthesizer synthesizes the received electrical signal to obtain an optimal signal and loads the optimal signal to a vehicle-mounted network.
The light beam emitted by the light emitting device 3 covers a distance of 25m as required.
In practice, the maximum distance between the hard spanning struts 10 of the catenary can reach 75m, the length of each carriage can be 25m, and the distance of 75m is the distance between the power supply supports published in IET Optoelectronics paper by the university of knosby, england, 2013. The divergence angle of the light beam emitted by the light emitting device 3 is theta, the distance covered by the light beam in the vehicle compartment is L, the distance from the light emitting device 3 to the top of the vehicle compartment is D, and the horizontal distance covered by the light beam emitted by the light emitting device 3 at the closest distance point is L1. The beam coverage distance L can be calculated according to the following existing mathematical model:
above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
Claims (10)
1. A high-speed railway free space light multi-beam diversity transmitting device is characterized by comprising a data center, a plurality of signal boxes, a plurality of light emitting devices, a plurality of light receiving devices and a plurality of power dividers; one or more light receiving devices are arranged on the outer side of the top of each train carriage, and a power divider and two or more light emitting devices are arranged on each cross arm of the hard crossing strut of the contact network above the rail; a signal box is arranged on any one of the N hard crossing struts of the contact network, and each signal box is connected with all power dividers arranged on cross arms of the hard crossing struts of the contact network of the corresponding N hard crossing struts; the data center is connected with the signal box through a cable, the signal box is connected with the corresponding power divider, the power divider is connected with all light emitting devices on the cross arm of the hard crossing strut of the overhead contact system where the power divider is located, and the light emitting devices are connected with the light receiving devices.
2. The high speed railway free space optical multi-beam diversity transmitting arrangement according to claim 1, wherein the light transmitting arrangement comprises a modulator and a laser; the modulator is connected to the laser.
3. The free-space optical multi-beam diversity transmitting device for the high-speed railway according to claim 1 or 2, wherein the signal box comprises a box body, and a serial-parallel conversion module is arranged in the box body.
4. The high-speed railway free-space optical multi-beam diversity transmitting device according to claim 1 or 2, wherein the optical receiving device comprises a photodetector, a low-pass filter and a combiner; the photoelectric detector is connected with the low-pass filter, and the low-pass filter is connected with the synthesizer.
5. The high-speed railway free-space optical multi-beam diversity transmitting device according to claim 3, wherein the optical receiving device comprises a photodetector, a low-pass filter and a combiner; the photoelectric detector is connected with the low-pass filter, and the low-pass filter is connected with the synthesizer.
6. The high-speed railway free-space light multi-beam diversity transmitting device according to claim 1, 2 or 5, wherein the light emitting device is arranged below a cross arm of a hard spanning strut of a contact line through a fixing piece.
7. The high-speed railway free-space optical multi-beam diversity transmitting device according to claim 3, wherein the light emitting device is arranged below a cross arm of a hard spanning strut of a contact line through a fixing piece.
8. The high-speed railway free-space optical multi-beam diversity transmitting device according to claim 4, wherein the light emitting device is arranged below a cross arm of a hard spanning strut of a contact line through a fixing piece.
9. The high-speed railway free-space optical multi-beam diversity transmitting device according to claim 1, 2, 5, 7 or 8, wherein the light emitting device emits light beams covering a distance length of 25 m.
10. The high-speed railway free-space optical multi-beam diversity transmitting device according to claim 6, wherein the light beam emitted by the light emitting device covers a distance of 25 m.
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| CN202020951036.9U CN211720556U (en) | 2020-05-29 | 2020-05-29 | Free space light multi-beam diversity transmitting device for high-speed railway |
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| CN202020951036.9U CN211720556U (en) | 2020-05-29 | 2020-05-29 | Free space light multi-beam diversity transmitting device for high-speed railway |
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Effective date of registration: 20210811 Address after: 528400 3 / F, building D1, No. 458, cao'er Dongan North Road, ancient town, Zhongshan City, Guangdong Province Patentee after: Guangdong Chuangxian Electronic Technology Co.,Ltd. Address before: 830046 school headquarters, 666 Shengli Road, Urumqi, Xinjiang Uygur Autonomous Region Patentee before: XINJIANG University |