CN109257083A - The compound relay transmission method of satellite-signal integration of high-speed rail tunnel area - Google Patents
The compound relay transmission method of satellite-signal integration of high-speed rail tunnel area Download PDFInfo
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- CN109257083A CN109257083A CN201811228174.8A CN201811228174A CN109257083A CN 109257083 A CN109257083 A CN 109257083A CN 201811228174 A CN201811228174 A CN 201811228174A CN 109257083 A CN109257083 A CN 109257083A
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- speed rail
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Aviation & Aerospace Engineering (AREA)
- Multimedia (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a kind of compound relay transmission methods of the satellite-signal of high-speed rail tunnel area integration, satellite communication signals and satellite TV signal are decoded respectively after forwarding and transparent forwarding be sent into same trunking carry out relaying zoom out, and relaying zoom out after by the signal recovered by leakage cable to tunnel radiate.Compared with prior art, the positive effect of the present invention is: more save the cost；On the one hand the availability of frequency spectrum is improved, on the other hand reduces the research and development cost of trunking；Decoding forwarding is realized using the technologies such as DVB-RCS/T in compared with the prior art, and technology is more advanced, using wider, and reliability is more guaranteed；Signal is relayed eventually by leakage cable radiation access high-speed rail train, technical maturity is high, and reliability is guaranteed；When conditions permit, leakage cable equipment can be shared with land mobile communication net, reduced satellite network in the cost of access in the region of existing land mobile communication net covering, reduced the waste of public resource.
Description
Technical field
The present invention relates to a kind of satellite communications of high-speed rail tunnel area and the compound relaying of direct satellite television broadcasing signal integration
Transmission method, it is intended to the wireless signals such as bridge, ditch, valley (can be promoted the use of and cover weak-strong test) area by tunnel for high-speed rail
Satellite communication and the relaying covering of direct satellite television broadcasing signal are provided when domain, to guarantee that high-speed rail is able to maintain during whole service
Continuously satellite-signal connects.Based on this programme, bottleneck of the satellite communication in high-speed rail mobile interchange can be greatly solved
Problem pushes satellite communication in the application in high-speed rail mobile interchange field.
Background technique
High-speed rail has become our most common trip modes at present, and by 2025, China's high-speed rail mileage will be up to 3.8 ten thousand public affairs
In.High-speed rail mobile interchange system for traveller's experience can be greatly improved is presently mainly to be based on ground moving net to realize
, and mature application case there is no based on the high-speed rail mobile interchange system that satellite communication is realized at present.
In the high-speed rail mobile interchange system based on ground moving net, there is network construction cost height (every several hundred rice
Just need to build a base station), cell switching frequently, the disadvantages of network optimization is complicated.In terms of the network coverage, in vast Chinese and Western
Portion area or mountain area, city density is low, and the rate of return on investment of networking will substantially reduce.On the other hand, as high-speed rail is walked to go abroad
Door, when high-speed rail passes through country variant, since there are standard differences for various countries' ground moving net, and network construction status is irregular not
It together, is that application of the high-speed rail mobile interchange system in wider region causes practical difficulty.And satellite-based high-speed rail mobile interchange
System but can solve these difficulties, build independent of complicated ground network, no matter in vast central and west regions, also
It is to go abroad, can greatly reduces cost of investment, accelerates the extensive use of high-speed rail mobile interchange system.On the other hand, with
The problem of fast development of the low rail high throughput satellite of Ka frequency range, satellite-based internet can solve the limitation of existing satellite bandwidth,
Satellite-based high-speed rail mobile interchange systematic difference will greatly be pushed.
As Land-Mobile-Network, satellite-based high-speed rail mobile interchange system also need solve tunnel, bridge,
The problem that the regional satellites signal such as ditch, valley is blocked.Currently, for satellite-signal in special screne (especially tunnel)
Relay problem, existing literature focus primarily upon the research of Gap Filler technology, are based particularly on DVB-S/S2/S2x
The Gap Filler technology of (Digital Video Broadcasting-Satellite/2/2x) standard.By studying above
Content discovery, it is serious by multi-path influence based on the relaying technique of DVB-S/S2 itself, although being based on OFDM by introducing
DVB-RCS/T (the Digital Video of (Orthogonal Frequency Division Multiplexing) technology
Broadcasting-Return Channel via Satellite/Terrestrial) technology can partially solve the problems, such as this, but
These researchs also exist only in emulation level, and there is no material object displays.On the other hand, these technologies due to application surface it is narrow, in work
Cheng Yingyong is upper specifically for technologies such as the anti-multipath of these standards, Doppler shift, skews and immature.
Summary of the invention
In order to overcome the disadvantages mentioned above of the prior art, the present invention provides a kind of satellite-signal of high-speed rail tunnel area one
Change compound relay transmission method, it is intended to solve the prior art to how realizing satellite-signal in high-speed rail by tunnel, bridge, ditch
Access Study on Problems when the special screnes such as moat, valley is insufficient, can not form the problem of total solution.The present invention passes through
A whole set of total solution is provided by the satellite-signal connectivity problem of the special screnes such as tunnel for high-speed rail, to realize height
Iron is difficult to cover or cover weak regional (signal shadow region) in satellite-signal and satellite holding is stably connected with, and meets passenger's whole process and leads to
Cross the demand of satellite connection internet and the live streaming that watches TV.
The technical solution adopted by the present invention to solve the technical problems is: a kind of satellite-signal one of high-speed rail tunnel area
Change compound relay transmission method, is sent after satellite communication signals and satellite TV signal are decoded forwarding and transparent forwarding respectively
Enter same trunking carry out relaying zoom out, and relaying zoom out after by the signal recovered by leakage cable to tunnel radiate.
Compared with prior art, the positive effect of the present invention is:
1, satellite communication signals and direct satellite television broadcasing signal are relayed with same set of equipment, more save the cost；
2, there are the actual conditions of different demands to the bit error rate for satellite communication signals and satellite TV signal, be respectively adopted
Decoding forwarding and transparent forwarding method, on the one hand improve the availability of frequency spectrum, on the other hand reduce the research and development of trunking
Cost；
3, for satellite communication signals use the decoding retransmission method based on LTE technology, compared with the prior art in adopt
Decoding forwarding is realized with technologies such as DVB-RCS/T, and technical application is wider, and reliability is more guaranteed；
4, relaying signal is eventually by leakage cable radiation access high-speed rail train, and technical maturity is high, and reliability is guaranteed；In item
In the case that part allows, leakage cable equipment can be shared with land mobile communication net, reduces satellite network in existing land mobile communication net
The cost of access of overlay area reduces the waste of public resource.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is the satellite communication trunking method based on LTE decoding forwarding；
Fig. 2 is the satellite television trunking method based on transparent forwarding；
Fig. 3 is that digital fiber relaying zooms out and leak cable covering schematic diagram.
Specific embodiment
A kind of compound relay transmission method of satellite-signal integration of high-speed rail tunnel area, including following content:
1, the present invention contains a kind of skill that can simultaneously satellite communication signals and satellite TV signal be carried out with relay transmission
Art；Based on mature digital optical fiber remote technology, satellite communication radiofrequency signal and satellite television radiofrequency signal are converted into L respectively
Wave band intermediate-freuqncy signal, then relaying is carried out by trunking and is zoomed out；
2, the feature high to bit error rate requirement for satellite communication signals, the invention proposes the decodings based on LTE technology
Forwarding scheme.After satellite communication signals are demodulated to IP data, secondary modulation is carried out by LTE technology and exports LTE radio
Signal is re-fed into trunking relay and zoom out；
3, lower feature is required error code for satellite TV signal demodulation, utmostly to improve spectrum efficiency, this
Invention proposes the scheme of the transparent forwarding to satellite TV's signal.The satellite TV's signal received is converted into L-band by receiving front-end
After intermediate-freuqncy signal, by intermediate-freuqncy signal be sent directly into trunking carry out relaying zoom out；
4, the composite signal of communication and TV recovered after relaying zooms out, using the side of leakage cable covering in the present invention
Formula realizes the uniform fold in tunnel.
It is described in detail below with reference to attached drawing:
Fig. 1 describes the signal transmission for defending logical repeated link and conversion process based on LTE decoding retransmission method: Wei Tongzhong
After being a two-way link, to realize the two-way communication between vehicle-mounted user and Internet user.For defending logical repeated link, adopt
With the method based on LTE decoding forwarding, the very low use demand of the bit error rate can be met.For forward link (from internet end to
Vehicle-mounted user terminal), the internet content (webpage, file, voice, video etc.) that vehicle-mounted user needs is passed through satellite by satellite main website
Emit by primary station antennas to telecommunication satellite after modem modulation.At tunnel end, defended by satellite earth antenna reception
Star signal, and it is converted to L-band intermediate-freuqncy signal, the satellite modem for being transmitted to tunnel relay satellite-signal access unit will
Satellite-signal is demodulated to IP data, then passes it to tunnel relay outdoor unit.By LTE base station, outdoor relaying unit will
IP data are converted to LTE radio signal, while relaying proximal end unit by digital fiber and converting light letter for LTE radio signal
Number.Optical signal is transferred to tunnel relay indoor unit by optical fiber, and optical signal is reduced into LTE radio telecommunications by unit indoors
Number, then this signal is radiated by leakage cable to tunnel.Vehicle-mounted receiving unit by antenna receive leakage cable radiation signal, and
LTE signal is decoded on board unit comprising LTE modem to recover IP data, finally passes through IP data
Wireless router carries out wireless access to interior passenger.For return link (from vehicle-mounted user to remote Internet end), it is then
The process opposite with forward link.
Fig. 2 describes the transmission and conversion process of satellite TV's link signal based on transparent forwarding method: satellite TV's relaying is one
A one way link.Using transparent forwarding mechanism, i.e., satellite TV's radiofrequency signal is converted to after intermediate-freuqncy signal and is directly forwarded, can expired
The sufficient received bit error rate requirement of satellite TV's signal.Satellite TV's signal passes through defending for TV station after the modulators modulate of the universal standard
Star television antenna emits satellite TV's signal to telstar.At tunnel end, TV is believed by a set of satellite TV's signal receiving antenna
L-band intermediate-freuqncy signal is changed into after number receiving, and this signal is transferred to tunnel relay outdoor unit.Tunnel relay outdoor unit will
L-band signal is converted into optical signal, and is transmitted through the fiber to tunnel relay indoor unit.Tunnel relay indoor unit believes light
Signal radiation is gone out by leakage cable after number reverting to intermediate frequency electric signal again.In vehicle-mounted end, leakage cable is received by car antenna
The signal of radiation, on board unit will receive after signal is amplified to the level range that can normally demodulate, be believed satellite TV by demodulator
Number demodulation.Hereafter, on the one hand TV signal directly can be connected to in-car TV by set-top box to play out, on the other hand,
It satellite TV's signal can be accessed to transcoding server carries out data compression and video format and convert, the data after compression and conversion can be with
Wireless coverage is carried out to interior passenger by wireless router.
Fig. 3, which is described, will defend logical relaying signal based on Optical fiber relay technology and satellite TV's relaying signal is zoomed out and passes through leakage
Cable realizes the process of tunnel radio covering.The present invention is used through digital optical fiber remote technology to satellite communication signals and satellite electricity
The method for carrying out zooming out transmission depending on signal.Meanwhile being save the cost, Wei Tong and satellite TV's signal share same set of equipment, same root
Optical fiber is zoomed out, and implementation is as shown in Figure 3.By the LTE radio signal and biography of 1785~1805MHz frequency range of communication
The intermediate-freuqncy signal of 950~1450MHz frequency range of defeated TV signal accesses digital fiber relaying proximal end unit simultaneously, by processing
Afterwards, two paths of signals is combined and digital fiber relaying far-end unit is passed to by same root optical fiber, far-end unit is compound by two-way
Optical signal revert to transmission communication and TV signal composite intermediate frequency electric signal, connect leakage cable in the delivery outlet of far-end unit,
It will be communicated by leakage cable and TV two-way intermediate-freuqncy signal radiate the wireless coverage to realize tunnel and its peripheral region.
Since leakage cable can cause to decay to signal, the leakage cable length that every number of units word Optical fiber relay far-end unit is connect
It is limited, therefore when tunnel is long, needs more far-end units that could cover entire tunnel.As shown in figure 3, of the invention
More number of units word Optical fiber relay far-end units are deployed in along tunnel at a certain distance, they pass through light in a manner of star-like connection
Fibre is connected to digital fiber relaying proximal end unit.Every far-end unit delivery outlet connects the signal that one section of leakage cable is responsible for this section and wirelessly covers
The wireless coverage to whole region along tunnel is realized in lid, more far-end unit combinations.
Feasibility to verify of the invention has developed model machine, and carried out field trial verifying, takes according to the method described above
Built field trial scene: leakage cable is set up along rail, divides 3 sections, every section of 100m.A number of units is disposed in the starting point that cable is leaked at each section
Word Optical fiber relay far-end unit, far-end unit output are connected to leakage cable, and signal radiation is gone out by leakage cable.Satellite-signal access point
The LTE base station of system, digital fiber relaying proximal end unit and a 1.8GHz frequency range is all placed in the cabinet of leakage cable one end.It defends
Star signal accesses subsystem and receives satellite-signal, and the intermediate-freuqncy signal of 950~1450MHz is directly exported for satellite TV's signal to number
Optical fiber relay proximal end unit input terminal, for defending messenger output IP signal to the LTE base station of 1.8GHz, LTE base station will be defended logical
After IP data change into the radiofrequency signal of 1.8GHz, the radiofrequency signal of 1.8GHz is exported to digital fiber relaying proximal end unit input
End.Digital fiber relays proximal end unit and carries out becoming optical signal after handling again with messenger is defended by satellite TV, passes through its output end
It draws 3 optical fiber and is respectively connected to 3 number of units word Optical fiber relay far-end units.Digital fiber relaying far-end unit reverts to optical signal
After electric signal, it is radiate by leaking cable.When test, test carriage is along leakage cable traveling or is still in certain, passes through vehicle
It carries equipment and watches satellite television or by defending the online of logical link, passing data, see video etc..
In test, the verifying for carrying out defending logical link by renting the satellite resource of 2MHz bandwidth is (by testing throughput
To be verified).When test, satellite communication uses TDMA system, QPSK modulation, and the Turbo channel coding of 3/4 code rate is roll-offed
Coefficient 0.2, under the conditions of 2MHz bandwidth resources, then Systems Theory achievable rate is Rb=2*0.8*2*3/4=2.4Mbps.It is logical
That crosses this system defends logical relaying lane testing discovery, no matter instruction carriage is the whether forward chaining under movement or quiescent conditions
Road (satellite main website to instruction carriage) or return link (instruction carriage to satellite main website), throughput peak value is up to 2.2Mbps, mean value
Then in 2Mbps or so, to demonstrate the feasibility of the present invention program.
It is then to be defended by watching that No. 9 satellite television programmings of culminant star are verified by watching culminant star 9 for satellite TV's link
Major television program in the TV data packet of star 12020MHz center frequency point (IF spot is 1250~1290MHz), test
It was found that the CCTV-1, CCTV-2, CCTV-7, CCTV-12, the CCTV-13, CCTV-14, north that are watched by this satellite TV trunking plan
The tv programme pictures such as capital satellite TV and Tianjin satellite TV are all very clear, to demonstrate the feasibility of the present invention program.
Claims (6)
1. a kind of compound relay transmission method of satellite-signal integration of high-speed rail tunnel area, it is characterised in that: by satellite communication
Signal and satellite TV signal are decoded after forwarding and transparent forwarding to be sent into same trunking and carry out relaying respectively and zoom out, and
The signal recovered is radiated by leakage cable to tunnel after relaying zooms out.
2. the compound relay transmission method of satellite-signal integration of high-speed rail tunnel area according to claim 1, feature
It is: the method that forwarding is decoded to satellite communication signals are as follows: satellite communication signals are demodulated to IP data first, it is then defeated
It exports after being converted to LTE radio signal to LTE base station out to trunking.
3. the compound relay transmission method of satellite-signal integration of high-speed rail tunnel area according to claim 2, feature
Be: the trunking carries out the method that zooms out of relaying to satellite communication signals are as follows: tunnel relay outdoor unit is by LTE radio
Signal is converted into optical signal, and optical signal is transmitted through the fiber to tunnel relay indoor unit, and tunnel relay indoor unit believes light
Number it is reduced into LTE radio electric signal.
4. the compound relay transmission method of satellite-signal integration of high-speed rail tunnel area according to claim 1, feature
It is: the method that transparent forwarding is carried out to satellite TV signal are as follows: the satellite TV signal received is converted into L by receiving front-end
It exports after the intermediate-freuqncy signal of wave band to trunking.
5. the compound relay transmission method of satellite-signal integration of high-speed rail tunnel area according to claim 4, feature
Be: the trunking carries out the method that zooms out of relaying to satellite TV signal are as follows: tunnel relay outdoor unit is by L-band
Intermediate-freuqncy signal is converted into optical signal, and optical signal is transmitted through the fiber to tunnel relay indoor unit, and tunnel relay indoor unit will
Optical signal reverts to intermediate frequency electric signal again.
6. the compound relay transmission method of satellite-signal integration of the high-speed rail tunnel area according to claim 3 or 5, special
Sign is: disposing more tunnel relay indoor units along tunnel, is connected in tunnel in a manner of star-like connection by optical fiber
After outdoor unit, every tunnel relay indoor unit delivery outlet connects the signal wireless coverage that one section of leakage cable is responsible for this section, more tunnels
Road relays indoor unit combination realization to the wireless coverage of whole region along tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811228174.8A CN109257083A (en) | 2018-10-22 | 2018-10-22 | The compound relay transmission method of satellite-signal integration of high-speed rail tunnel area |
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| CN201811228174.8A CN109257083A (en) | 2018-10-22 | 2018-10-22 | The compound relay transmission method of satellite-signal integration of high-speed rail tunnel area |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109828289A (en) * | 2019-03-06 | 2019-05-31 | 湖南卫导信息科技有限公司 | Navigation information analogue system for tunnel |
| CN110011722A (en) * | 2019-04-02 | 2019-07-12 | 中国电子科技集团公司第二十九研究所 | It is a kind of to cross tunnel quickly to star method and system for vehicle satellite communication in motion |
| CN111698561A (en) * | 2019-03-15 | 2020-09-22 | 新伟泛网络有限公司 | Method, device, system and storage medium for watching live video on high-speed rail |
| CN112600595A (en) * | 2020-12-09 | 2021-04-02 | 北京凯博无线科技有限公司 | Tunnel leaky-cable communication system |
| CN114481727A (en) * | 2022-04-18 | 2022-05-13 | 中铁第四勘察设计院集团有限公司 | Intelligent control system and method for unmanned water jet steel rail grinding wagon |
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Application publication date: 20190122 |