CN108093494B - L-frequency band communication system of MF-TDMA satellite communication system - Google Patents
L-frequency band communication system of MF-TDMA satellite communication system Download PDFInfo
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- CN108093494B CN108093494B CN201711412165.XA CN201711412165A CN108093494B CN 108093494 B CN108093494 B CN 108093494B CN 201711412165 A CN201711412165 A CN 201711412165A CN 108093494 B CN108093494 B CN 108093494B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/12—Channels characterised by the type of signal the signals being represented by different phase modulations of a single carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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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
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
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Abstract
The invention provides an L-frequency band communication system of an MF-TDMA satellite system, which comprises: the system is arranged in two separated L-frequency-band communication links, a selected terminal station indoor unit is independently arranged in a first L-frequency-band communication link, and the master station indoor unit and the rest terminal station indoor units are arranged in a second L-frequency-band communication link; each L-band communication link comprises an L-band omnidirectional antenna, a duplexer, a transmitting-blocking filter, a receiving-blocking filter, a low-noise amplifier and an amplifier; and configuring the system to operate on 2 TDMA carriers, including a primary carrier and a traffic carrier; the main carrier is used for transmitting data by a main station and receiving data by indoor units of all terminal stations; and the service carrier is used for receiving data by the main station and transmitting data by the indoor units of the terminal stations. The invention can establish L-band communication in MF-TDMA satellite communication, and realize fast and efficient communication and reliable data transmission.
Description
Technical Field
The invention belongs to the technical field of MF-TDMA satellite communication, and relates to an L-frequency band communication system of an MF-TDMA satellite communication system.
Background
MF-TDMA is the mainstream satellite communication system at present, and each channel can support different speed according to the application requirement of the user, and can also carry out frequency hopping operation between different channels. Each channel is divided into TDMA time slots so that one channel can simultaneously support multiple voice and data connections between multiple sites. The MF-TDMA supports various topological structure networks such as a full mesh network, a star network, a mixed network and the like, supports a dynamic bandwidth allocation mechanism, and can provide instantaneous bandwidth allocation according to needs. The MF-TDMA ground station mainly comprises an antenna, an up-conversion power amplifier (BUC), a low noise amplification down-converter (LNB), an indoor unit (IDU) and related management/application software. The ground station generally operates in the Ku band and the indoor unit generally operates in the L band.
Disclosure of Invention
The invention aims to solve the problem of how to establish L-band communication in MF-TDMA satellite communication to realize fast and efficient communication and reliable data transmission.
The technical means for solving the problem is to provide an L-band communication system of an MF-TDMA satellite system, and in some special application scenes without repeaters, an L-band wireless communication system comprising a main station and a terminal station is constructed by utilizing an indoor unit.
The invention relates to an L-frequency band communication system of an MF-TDMA satellite system, which comprises:
the system is arranged in two separated L-frequency-band communication links, a selected terminal station indoor unit is independently arranged in a first L-frequency-band communication link, and the master station indoor unit and the rest terminal station indoor units are arranged in a second L-frequency-band communication link;
each L-band communication link comprises an L-band omnidirectional antenna, a duplexer, a transmitting-blocking filter, a receiving-blocking filter, a low-noise amplifier and an amplifier, wherein the L-band omnidirectional antenna is connected with the duplexer, the output end of the duplexer is sequentially connected with the transmitting-blocking filter and the low-noise amplifier, and the low-noise amplifier is connected with the master station indoor unit or the terminal station indoor unit; the master station indoor unit or the terminal station indoor unit, the amplifier and the blocking filter are connected in sequence and then connected into the input end of the duplexer;
and configuring the system to operate on 2 TDMA carriers, including a primary carrier and a traffic carrier; the main carrier is used for transmitting data by the master station indoor unit and receiving data by each terminal station indoor unit in the two L-band communication links; and the service carrier is used for receiving data by the master station indoor unit and sending data by each terminal station indoor unit in the two L-band communication links.
Further, as a preferred technical solution of the present invention: the number of indoor units of the terminal station is at least 2.
Further, as a preferred technical solution of the present invention: the second L-band communication link further comprises a splitter and a combiner, and the splitter is used for distributing data to the master station indoor unit or the terminal station indoor unit after being connected with the low-noise amplifier; and the combiner is used for connecting the master station or the terminal station indoor unit to integrate the data and then transmit the data to the amplifier.
Further, as a preferred technical solution of the present invention: the data sent by the master station indoor unit on the master carrier wave comprises reference, application information and ranging information.
The invention has the advantages that the invention is suitable for the L-frequency band wireless communication of the MF-TDMA guard system without forwarding condition. A communication link suitable for L-frequency band wireless communication of an MF-TDMA satellite-satellite communication system is designed, a master station transmits on a main carrier and receives on a service carrier; the terminal station transmits on the traffic carrier and receives on the main carrier.
Drawings
Fig. 1 is a schematic block diagram of an L-band communication system of an MF-TDMA satellite system according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the present invention designs an L-band communication system of an MF-TDMA satellite system, and the present invention constructs an L-band wireless communication system including a master station and a terminal station by using an indoor unit IDU. The system of the present invention comprises: a master station indoor unit and a plurality of terminal station indoor units.
The system is arranged in two separated L-band communication links, a selected terminal station indoor unit is independently arranged in a first L-band communication link, and a master station indoor unit and the rest terminal station indoor units are arranged in a second L-band communication link.
In this embodiment, an L-band wireless communication system including 1 set of master station and 3 sets of terminal stations is constructed as an example, where the master station and 2 sets of terminal stations share a second radio frequency link, and another set of terminal station indoor units individually use a first radio frequency link.
And configuring the system to operate on 2 TDMA carriers, including a primary carrier and a traffic carrier; the main carrier is used for transmitting data by the master station indoor unit and receiving data by each terminal station indoor unit in the two L-band communication links; and the service carrier is used for receiving data by the master station indoor unit and sending data by each terminal station indoor unit in the two L-band communication links.
In this embodiment, carrier 1 is set as a primary carrier, and carrier 2 is set as a service carrier. The station transmits reference, application and ranging information on carrier 1, which is the primary carrier, and receives data on carrier 2. The 3 terminal station indoor units transmit data on carrier 2 and receive data on carrier 1.
Each L-band communication link comprises an L-band omnidirectional antenna, a duplexer, a transmitting and blocking filter, a receiving and blocking filter, a low-noise amplifier and an amplifier, wherein the L-band omnidirectional antenna is connected with the duplexer, the output end of the duplexer is sequentially connected with the transmitting and blocking filter and the low-noise amplifier, and the low-noise amplifier is connected with the master station indoor unit or the terminal station indoor unit; the master station indoor unit or the terminal station indoor unit, the amplifier and the blocking filter are connected in sequence and then connected into the input end of the duplexer;
preferably, the main station and 2 terminal station IDU indoor units sharing the antenna in the system share the transmitting and receiving signals through a branching and branching device. The second L-band communication link also comprises a splitter and a combiner, wherein the splitter is used for distributing data to the master station indoor unit or the terminal station indoor unit after being connected with the low-noise amplifier; and the combiner is used for connecting the master station or the terminal station indoor unit to integrate the data and then transmit the data to the amplifier.
Through the process, a communication link suitable for L-frequency band wireless communication of the MF-TDMA satellite-communication system is constructed, and data receiving and sending are achieved.
In the specific implementation of the system, the dynamic range of IDU input level is set to be-70 to-30 dBm, and the dynamic range of output level is set to be-30 to 0 dBm; the saturation power of the transmitting amplifier is 30dBm, and the gains are all 40 dB; the gain of the receiving LNA is 30dB, the saturation power is 10dBm, and the noise figure is 2.5 dB. The gain of the L omnidirectional antenna is 0dB, rain attenuation is not considered, the front link and the return link are symmetrical links, and the link calculation results are the same. Taking the forward link as an example, the link calculation results include the master station-to-independent terminal station link calculation, the independent terminal station receive path level calculation, and the independent terminal station transmit link level calculation.
Master to independent terminal station link computation
| Data Rate (kbps) | 2000.00 |
| Carrier frequency (GHz) | 1.45 |
| Transmitting EIRP (dBW) | 0.00 |
| Spatial distance (Km) | 2.00 |
| Space loss (dB) | 101.69 |
| Boltzmann constant | 228.60 |
| Polarization loss/directional loss (dB) | 0.50 |
| Rain decline (dB) | 0.00 |
| Receiving G/T value (dB/K) | -29.65 |
| Down C/N0(dB) | 96.77 |
| Down Eb/N0(dB) | 33.76 |
| Demodulation threshold | 5.50 |
| The balance (dB) | 28.26 |
Receive path level calculation for independent terminal stations
Independent terminal station transmit link level calculation
From the above calculation, the link margin and the level of the forward-return communication link of the system can both meet the use requirement.
In conclusion, the system is suitable for L-band wireless communication of the MF-TDMA satellite communication system without forwarding conditions. A communication link suitable for L-frequency band wireless communication of an MF-TDMA satellite-satellite communication system is designed, a master station transmits on a main carrier and receives on a service carrier; the terminal station transmits on the traffic carrier and receives on the main carrier.
It should be noted that the above description is only a preferred embodiment of the present invention, and it should be understood that various changes and modifications can be made by those skilled in the art without departing from the technical idea of the present invention, and these changes and modifications are included in the protection scope of the present invention.
Claims (4)
1. An L-band communication system of an MF-TDMA satellite system, comprising:
the system is arranged in two separated L-frequency-band communication links, a selected terminal station indoor unit is independently arranged in a first L-frequency-band communication link, and the master station indoor unit and the rest terminal station indoor units are arranged in a second L-frequency-band communication link;
the first L-band communication link and the second L-band communication link respectively comprise an L-band omnidirectional antenna, a duplexer, a transmitting and blocking filter, a receiving and blocking filter, a low-noise amplifier and an amplifier, wherein the L-band omnidirectional antenna is connected with the duplexer, the output end of the duplexer is sequentially connected with the transmitting and blocking filter and the low-noise amplifier, and the low-noise amplifier is connected with the master station indoor unit or the terminal station indoor unit; the master station indoor unit or the terminal station indoor unit, the amplifier and the blocking filter are connected in sequence and then connected into the input end of the duplexer;
and configuring the system to operate on 2 TDMA carriers, including a primary carrier and a traffic carrier; the main carrier is used for transmitting data by the master station indoor unit and receiving data by each terminal station indoor unit in the two L-band communication links; and the service carrier is used for receiving data by the master station indoor unit and sending data by each terminal station indoor unit in the two L-band communication links.
2. An MF-TDMA satellite system L-band communication system according to claim 1, c h a r a c t e r i z e d in that the number of said terminal station indoor units is at least 2.
3. An MF-TDMA satellite system L-band communication system according to claim 1, c h a r a c t e r i z e d in that said second L-band communication link further comprises a splitter and combiner, said splitter being adapted to distribute data to master or terminal station indoor units after connection of low noise amplifiers; and the combiner is used for connecting the master station or the terminal station indoor unit to integrate the data and then transmit the data to the amplifier.
4. An MF-TDMA satellite system L band communication system according to claim 1, c h a r a c t e r i z e d in that the data transmitted by the master station indoor unit on the main carrier comprises references, application information and ranging information.
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| CN113708827B (en) * | 2021-09-14 | 2022-07-22 | 四川安迪科技实业有限公司 | Power balance planning method for return link of MF-TDMA satellite communication system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716066A (en) * | 2013-12-25 | 2014-04-09 | 天津海洋数码科技有限公司 | Shipborne satellite broadband communication modem based on code division multiple access encoding mode |
| CN103747219A (en) * | 2013-12-27 | 2014-04-23 | 北京航天科工世纪卫星科技有限公司 | DVB (Digital Video Broadcasting) carrier wave receiving system |
| CN105515641A (en) * | 2016-01-05 | 2016-04-20 | 成都九洲电子信息系统股份有限公司 | Big data transmission system based on big dipper first generation communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10177947B2 (en) * | 2015-07-24 | 2019-01-08 | Brian G. Agee | Interference-excising diversity receiver adaptation using frame synchronous signal features and attributes |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716066A (en) * | 2013-12-25 | 2014-04-09 | 天津海洋数码科技有限公司 | Shipborne satellite broadband communication modem based on code division multiple access encoding mode |
| CN103747219A (en) * | 2013-12-27 | 2014-04-23 | 北京航天科工世纪卫星科技有限公司 | DVB (Digital Video Broadcasting) carrier wave receiving system |
| CN105515641A (en) * | 2016-01-05 | 2016-04-20 | 成都九洲电子信息系统股份有限公司 | Big data transmission system based on big dipper first generation communication system |
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