CN102611490A - Digital information transmission system based on satellite channel multiplexing and transmission method thereof - Google Patents
Digital information transmission system based on satellite channel multiplexing and transmission method thereof Download PDFInfo
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Abstract
The invention discloses a digital information transmission system based on satellite channel multiplexing, comprising a satellite ascending station and a far-end receive-only device; and the satellite ascending station converts the format of a far-end control instruction into a TS stream data format, and the far-end control instruction is issued to the far-end receive-only device by multiplexing through a satellite channel so as to realize control over a far-end receive-only device. The transmission system is simple in structure, supports marshalling management, is low in manufacture and maintenance, and is suitable for large-scale popularization. The invention also discloses a transmission method of the digital information transmission system based on the satellite channel multiplexing. The transmission system and the transmission method are applicable to wide-area issuing of control instructions and related digital information of streetlamps, signal lamps, electronic signs and alarms at regions with weak ground communication coverage such as suburbans, fields, mountainous area and lake islands.
Description
Technical Field
The present invention relates to a satellite transmission system and a satellite transmission method for remote device control information, and more particularly, to a digital information transmission system and a digital information transmission method based on satellite channel multiplexing.
Background
In suburb areas, fields, mountain areas, lake islands and other areas with low population density, ground communication line coverage is weak, remote release of control instructions and digital information of remote information equipment such as street lamps, signal lamps, electronic tags and alarms is generally realized by adopting a traditional communication cable laying mode, and the problems of high investment cost, long construction period, high construction difficulty, difficult later maintenance and the like exist. The satellite communication takes a high-altitude static orbit satellite as a link relay, has the characteristics of high coverage rate, low construction cost, quick period, stable channel quality and the like, has wide landform applicability, and has obvious advantages in the specific application fields of remote control instruction single receiving, digital information wide-area distribution and the like.
The standardized satellite receiving device in the prior art comprises a satellite antenna, an RF receiving module, an image decoding module, an audio and video connecting terminal and other components, the main processing object of the standardized satellite receiving device is audio and video multimedia information in a satellite carrier, and the calculation amount, complexity and cost are high.
The invention overcomes the defects in the prior art and provides a transmission system and a transmission method which are low in cost, quick in construction, easy to maintain and flexible in expansion.
Disclosure of Invention
The invention provides a digital information transmission system based on satellite channel multiplexing and a transmission method thereof, which have the advantages of low cost, quick construction, easy maintenance, flexible expansion and the like.
The invention provides a digital information transmission system based on satellite channel multiplexing, which comprises a satellite uplink station and a far-end single receiving device. The format of the remote control instruction is converted into a TS stream data format in the satellite uplink station, and the TS stream data format is distributed to the remote single receiving device through a satellite channel through multiplexing, so that the control of the opposite single receiving device is realized.
In the invention, the satellite uplink station comprises:
the remote equipment centralized management machine sends a remote control instruction;
the interface/protocol adaptation module is connected with the remote equipment centralized management machine and converts the format of the remote control instruction into a TS stream data format;
the TS flow multiplexer is connected with the interface/protocol adaptation module and is used for multiplexing the remote control information of the TS flow media format;
the multimedia information source is connected with the TS stream multiplexer and outputs digital content information in a TS stream data format; the digital content information may be a television program, a broadcast program, a remote education courseware, etc., among others.
The modulator is connected with the TS flow multiplexer and is used for carrying out channel coding on the baseband signal in the TS flow data format and converting the baseband signal into a waveform suitable for satellite channel transmission;
the radio frequency unit is connected with the modulator, receives the signal from the modulator, processes the radio frequency signal of the signal and then sends the signal.
In the present invention, the distal-end single-receiver device further comprises:
a satellite antenna that receives a satellite carrier signal;
the RF receiving module is connected with the satellite antenna, searches a preset carrier wave, completes channel demodulation and extracts remote control information from the carrier wave;
the single chip microcomputer is connected with the RF receiving module, extracts a remote control instruction from the remote control information and converts the format of the remote control instruction;
the remote controlled equipment is connected with the single chip microcomputer control module and receives the remote control instruction transmitted by the single chip microcomputer.
The satellite antenna is a small-caliber reflector antenna or a flat antenna, and an integrated down converter is mounted on the satellite antenna and used for receiving satellite carrier signals. The remote controlled equipment is equipment for receiving a remote control instruction of the remote equipment centralized management machine and executing the remote control instruction; the remote controlled equipment is information terminals such as street lamps, signal lamps, electronic placards, alarms and the like.
The invention also provides a transmission method of the digital information transmission system based on satellite channel multiplexing, which comprises a process of issuing the remote control information by the satellite uplink station and a process of receiving the remote control information by the remote single receiving device.
Wherein, the steps of the release process are as follows:
1): the interface/protocol adaptation module converts the remote control instruction of the remote equipment centralized management machine into remote control instruction information in a TS stream data format;
2): the TS flow multiplexer multiplexes digital content information output by the multimedia signal source and remote control instruction information output by the interface/protocol adaptation module to synthesize a broadband composite TS data flow;
3): the modulator carries out channel coding on the baseband signal in the TS stream data format and converts the baseband signal into a waveform suitable for satellite channel transmission;
4) the radio frequency unit processes the radio frequency signal from the modulator and then sends the processed signal.
Wherein, the step of receiving process is:
1): the satellite antenna receives a satellite carrier wave containing remote control information;
2): the RF receiving module searches the carrier wave and completes channel demodulation to obtain the remote control information of the multiplexed TS stream data format;
3): the singlechip separates the channels of the remote control information in the multiplex, extracts the remote control instruction, and converts the remote control instruction into a format which can be accepted by the remote controlled equipment;
4): and the remote controlled equipment receives and executes the remote control instruction.
The invention has the innovation point that a remote equipment centralized management machine and an interface/protocol adaptation module are introduced, and the remote control instruction digital information is introduced into an uplink station baseband processing link in a multiplexing mode, so that a new satellite uplink station system with remote control instruction and related digital information satellite transmission capability is formed. The new satellite uplink station system has an inclusion relation with a standard satellite uplink station, does not change the original signal processing process, the original service content and the original equipment composition, only adds a remote equipment centralized management machine and an interface/protocol adaptation module on the basis of the new satellite uplink station system, compounds remote control instruction information into an original information channel, and separates the instruction at a remote single receiving device after the remote control instruction information is transmitted by a satellite relay. The single chip microcomputer only analyzes remote control information, the structure is simple, the requirement on computing capability is low, audio and video multimedia information in satellite carriers is not processed, the standard satellite receiving device takes the satellite carrier as a main processing object, and the computation amount, the complexity and the cost are obviously high.
The digital information transmission system based on satellite channel multiplexing has a customized interface matched with the remote controlled equipment, and is consistent with the remote controlled equipment in physical connection and data format protocol.
The invention changes the prior digital instruction information transmission mode for remote control of remote equipment by laying cables, and has obvious comparison advantages of construction cost, construction period, operation and maintenance and the like in the application environment of open-air, rivers, lakes and islands and other sparse routes.
Drawings
FIG. 1 is a schematic diagram of the structure of a digital information transmission system based on satellite channel multiplexing according to the present invention;
FIG. 2 is a schematic diagram of signal transmission from a satellite uplink station according to the present invention;
fig. 3 is a signal transmission diagram of the remote-end single-receiving device in the present invention;
fig. 4 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The invention is explained in further detail below with reference to the figures and examples. The following examples are not intended to limit the invention. Variations and advantages that may occur to those skilled in the art may be incorporated into the invention without departing from the spirit and scope of the inventive concept.
Example 1:
referring to fig. 1, a digital information transmission system based on satellite channel multiplexing according to this embodiment is shown, and fig. 1 is a schematic structural diagram of the digital information transmission system based on satellite channel multiplexing according to the present invention. The digital information transmission system based on satellite channel multiplexing comprises at least one satellite uplink station 100 and a plurality of remote single receiving devices 200, and realizes the import and wide-area distribution of remote equipment control instruction information.
As shown in fig. 1, the satellite uplink station 100 includes: a remote device centralized management machine 101, a multimedia signal source 102, a TS stream multiplexer 103, a modulator 104, a radio frequency unit 105, and an interface/protocol adaptation module 106. The multimedia signal source 102 and the TS stream multiplexer 103 are connected through an ASI/SPI interface, the TS stream multiplexer 103 and the modulator 104 are connected through an ASI interface, and the modulator 104 and the radio frequency unit 105 are connected through a coaxial line. The remote device centralized manager 101 is connected to the interface/protocol adaptation module 106 through an RS232/RS458 interface, and the interface/protocol adaptation module 106 is connected to the TS stream multiplexer 103 through an ASI interface.
As shown in fig. 1, the remote-end sheet-taking apparatus 200 includes: the system comprises a satellite antenna 201, an RF receiving module 202, a single chip microcomputer 203 and a remote controlled device 204. The RF receiving module 202 is connected with the satellite antenna 201 through a coaxial line, the single chip microcomputer 203 is connected with the RF receiving module 202 through an internal bus, and the remote controlled device 204 is connected with the single chip microcomputer 203 through an RS232/RS485 interface.
The satellite antenna 201 is a small-caliber reflector antenna or a flat antenna, and is configured with an integrated down converter (LNBF) high-frequency head module. The remote controlled device 204 may be a street light, a signal light, an electronic sign, an alarm, or other information terminal.
Referring to fig. 2 and 3, the transmission method of the digital information transmission system based on satellite channel multiplexing according to the present invention includes a satellite uplink station 100 performing a process of issuing remote control information, and a remote single receiving device 200 performing a process of receiving remote control information.
Wherein, the steps of the release process are as follows:
1): the interface/protocol adaptation module 106 converts the remote control instruction of the remote device centralized management machine 101 into remote control instruction information in a TS stream data format;
2): the TS stream multiplexer 103 multiplexes the digital content information output by the multimedia signal source 102 and the remote control instruction information output by the interface/protocol adaptation module 106 to synthesize a broadband composite TS data stream;
3): the modulator 104 performs channel coding on the baseband signal in the TS stream data format, and converts the baseband signal into a waveform suitable for satellite channel transmission;
4) the rf unit 105 processes the rf signal from the modulator 104 and transmits the processed signal.
The receiving process comprises the following steps:
1): the satellite antenna 201 receives a satellite carrier containing remote control information;
2): the RF receiving module 202 searches for a carrier and completes channel demodulation to obtain remote control information in a multiplexed TS stream data format;
3): the single chip microcomputer 203 separates the channels of the remote control information in the multiplex, extracts the remote control instruction, and converts the remote control instruction into a format acceptable by the remote controlled device 204.
4): the remote controlled device 204 receives the remote control instruction and executes it.
Referring to fig. 2, fig. 2 is a schematic diagram of an uplink signal transmission process of the satellite uplink station 100 according to the embodiment.
The multimedia signal source 102, the TS stream multiplexer 103, the modulator 104 and the radio frequency unit 105 are standardized configuration equipment forming a satellite uplink station, and the standard configuration equipment completes baseband signal processing and signal emission staring required by audio and video multimedia information satellite delivery, and realizes multimedia digital content satellite broadcasting such as television, broadcasting, remote education and the like.
The multimedia information source 102 outputs the television program, the broadcast program, the remote education courseware or other digital content information in the TS stream data format, which is other user service information in parallel with the newly added remote control instruction information of the present invention. The various types of digital content information from the different information sources are simultaneously connected to the multiplexer 103, multiplexed by it, and combined into a single broadband TS data stream. The modulator 104 performs channel coding on the baseband signal in the TS stream data format, and converts the baseband signal into a waveform suitable for satellite channel transmission; the rf unit 105 receives the intermediate frequency signal from the modulator 104, performs related rf signal processing such as up-conversion, power amplification, and radio wave transmission, and transmits the processed signal.
The device forms the existing standard configuration satellite uplink station system, and realizes the satellite broadcast of multimedia digital contents such as television, broadcast, remote education and the like.
The remote device centralized management machine 101 issues a remote control instruction of the remote device. The output of the remote control instruction of the remote device generally adopts an RS232 or RS485 interface protocol.
The interface/protocol adaptation module 106 is configured to complete matching conversion between the output physical interface and the transmission protocol of the remote device centralized manager 101 and the input interface protocol of the TS stream multiplexer 103, and convert the remote control command in the RS232 or RS485 format output by the remote device centralized manager 101 into a format receivable by the SPI or ASI input physical interface of the TS multiplexer 103. The interface/protocol adaptation module 106 can customize the development device, and the specific interface and protocol conversion specification depends on the front-end device and the back-end device, and is not limited to the above interface contents.
Fig. 3 is a schematic diagram of a signal transmission process of the remote-end receiving apparatus 200 according to the present embodiment.
The satellite antenna 201 receives a satellite carrier containing remote control information, and down-converts the satellite carrier to an L-band IF intermediate frequency signal for output; the satellite carrier is a downlink electric wave signal transmitted from the satellite uplink station 100 to the satellite and relayed by the satellite relay.
The RF receiving module 202 receives the L-band IF intermediate frequency signal transmitted from the satellite antenna 201, searches for and locks a carrier transmitted from the satellite uplink station 100, and completes channel demodulation to restore the IF intermediate frequency modulated wave to a TS stream baseband signal, and a TS stream multiplexed in the satellite carrier is output to the rear-stage one-chip microcomputer 203 in an internal bus manner, where the TS data stream includes multiplexed and combined remote control information. The RF receiving module 202 includes two functional circuits of Tuner tuning and Demod channel demodulation, and the channel demodulation supports the technical standards of DVB-S, DVBS2, ABS-S, etc.
The single chip 203 first executes the PID filtering algorithm, separates the channel of the remote control instruction information in the multiplexed data stream containing the integrated information, then analyzes the device descriptor of the received information according to the predefined remote device grouping protocol, extracts the remote control instruction information belonging to the terminal or the terminal grouping, converts the remote control instruction information into a hardware interface and a data format matched with the lower computer of the remote controlled device 204, and outputs the hardware interface and the data format.
The remote controlled device 204 receives the remote control instruction information from the single chip 203 and executes the related device actions or processes the related digital information, such as signal switching, information display, information playing, and the like. The remote controlled device 204 is a device that receives a remote control instruction from the remote device centralized management machine 101 and executes the remote control instruction, and may be an information terminal such as a street lamp, a signal lamp, an electronic sign, an alarm, and the like, and the execution process of the remote instruction may be signal switching, relay switching action, and text display. The system centralized control management machine is arranged in the system, and the formats of the output information of the system centralized control management machine are RS232, RS485 and IP datagram.
Example 2
A plurality of turnouts exist in a certain highway section in a remote mountain area, and an electronic placard needs to be arranged to remind the area of road abnormity such as road interruption caused by frequent landslide and falling of mountain stones and vehicle diversion information. However, if the road section is located in a deep mountain, if the traditional laying cable is adopted to connect a plurality of electronic slogans, the problems of long connecting line, high construction difficulty, high capital investment, long construction period and the like exist, and therefore no communication cable is laid along the road. The invention can meet the application requirements and effectively overcome the difficult factors.
Fig. 4 is a schematic structural view of the electronic traffic sign board for setting roads in the invention. As shown in fig. 4, the digital information transmission system of this embodiment includes a standard satellite uplink station 100, which includes a remote device central management machine 101, a multimedia information source 102, a TS stream multiplexer 103, a modulator 104, a radio frequency unit 105, and an interface/protocol adaptation module 106, so as to implement a digital content satellite transmission service. The far-end single receiving device 200 at the turnout in the mountain area is composed of a satellite antenna 201, an RF receiving module 202, a single chip microcomputer 203 and a far-end controlled device 204. The connection manner of the components in this embodiment is the same as that in embodiment 1, and is not described again here.
In this embodiment, the remote device centralized management machine 101 is an electronic placard centralized management machine, and the remote controlled device 204 is a remote controlled electronic placard.
When the traffic information needs to be issued, an operator may enter the traffic information into the remote device centralized management machine 101, which is an electronic placard centralized management machine in this embodiment. The electronic placard centralized management machine is provided with an RS232/RS485 remote control communication interface, and the traffic information is sent to the interface/protocol adaptation module 106 through the interface; the interface/protocol adaptation module 106 performs encapsulation conversion processing from an RS232/RS485 data format to a TS stream data format, and sends traffic information to the TS stream multiplexer 103 through an ASI interface of the module; the TS stream multiplexer 103 multiplexes and combines multiple TS streams from the interface/protocol adaptation module 106 and the multimedia signal source 102, and sends the multiplexed broadband TS stream to the modulator 104; the modulator 104 module performs channel coding on the TS stream baseband information, the channel coding may be based on general standards such as DVB-S, DVB-S2, and the output signal after the channel coding processing by the debugger 104 is an L-band signal and is transmitted to the radio frequency unit 105 module; the radio frequency unit 105 receives the L-band signal from the modulator, performs processing procedures such as satellite carrier up-conversion, power amplification, satellite-to-satellite transmission, and the like, and transmits the satellite carrier containing various types of multiplexed integrated information to the geosynchronous communication satellite, and the up-conversion of the radio frequency unit 105 can select satellite carriers of various frequency bands, such as a commonly used C-band, Ku-band, and the like. The geosynchronous communication satellite receives a carrier signal from the satellite uplink station 100, and performs power amplification and downlink transfer processing.
The satellite antenna 201 receives a C-band or Ku-band satellite carrier wave forwarded by a communication satellite relay from the satellite uplink station 100, an LNBF unit installed on the satellite antenna 201 performs signal amplification and frequency reduction processing on the satellite carrier wave, and outputs an L-band intermediate frequency signal to the RF receiving module 202; the RF receiving module 202 performs channel demodulation processing of the L-band intermediate frequency signal, where the processing process is the inverse process of the processing of the modulator 104 in the uplink station 100, and the RF receiving module 202 outputs a TS stream including various types of multiplexing synthesis information, where the TS stream corresponds to the TS stream content output by the TS stream multiplexer 103 in the uplink station 100; the TS flow from the RF receiving module 202 is transmitted to the single chip 203 through the internal bus of the circuit, the single chip 203 performs channel separation and information extraction of the remote control instruction, the adopted technical method may be PID filtering, device descriptor parsing, and the like, and the single chip 203 performs format conversion on the extracted remote control instruction information belonging to the terminal or the terminal grouping according to the output requirement, and outputs the remote control instruction information after completing the matching with the hardware interface and the data format of the lower computer of the remote controlled device 204. The remote controlled electronic placard receives the remote control command from the single-chip microcomputer 203 and executes the related device actions, such as displaying the traffic information content of the electronic placard, opening or closing the electronic placard, setting the display format and page-turning frequency of the electronic placard, and the like. The remote electronic signboards at different turnouts have different equipment identification codes, and the satellite uplink station can issue different instruction information, such as different accident point distance display and diversion suggestions, aiming at the electronic signboards at different positions.
The embodiments described above are provided to enable persons skilled in the art to make or use the invention. Since modifications and changes can be made to the above-described embodiments by those skilled in the art without departing from the spirit of the invention, the scope of the invention should not be limited by the above-described embodiments, but should be accorded the widest scope consistent with the technical features set forth in the claims.
Claims (6)
1. A digital information transmission system based on satellite channel multiplexing, characterized by comprising a satellite uplink station (100) and a remote radio unit (200); the format of the remote control command is converted into a TS stream data format in the satellite uplink station (100), and the TS stream data format is distributed to the remote single receiving device (200) through a satellite channel by multiplexing, so that the remote single receiving device (200) is controlled.
2. The satellite channel multiplexing-based digital information transmission system according to claim 1, wherein the satellite uplink station (100) further comprises:
a remote device centralized management machine (101) which issues a remote control instruction;
an interface/protocol adaptation module (106) connected with the remote device centralized manager (101) and converting the format of the remote control command into a TS stream data format;
a TS stream multiplexer (103) connected with the interface/protocol adaptation module (106) and used for multiplexing the remote control information of the TS stream media format;
a multimedia information source (102) connected to the TS stream multiplexer (103), the multimedia information source (102) outputting digital content information in a TS stream data format;
a modulator (104) connected to the TS stream multiplexer (103) and used for channel coding the baseband signal in the TS stream data format and converting the baseband signal into a waveform suitable for satellite channel transmission;
and a radio frequency unit (105) connected to the modulator (104), which receives the signal from the modulator (104), processes the signal with a radio frequency signal, and transmits the signal.
3. The satellite channel multiplexing-based digital information transmission system according to claim 1, wherein the far-end single-receiving device (200) further comprises:
a satellite antenna (201) that receives a satellite carrier signal;
an RF receiving module (202) connected with the satellite antenna (201), which searches preset carrier waves and completes channel demodulation, and extracts remote control information from the carrier waves;
the single chip microcomputer (203) is connected with the RF receiving module (202), extracts a remote control instruction from remote control information and converts the format of the remote control instruction;
and the remote controlled equipment (204) is connected with the singlechip control module 203 and receives the remote control instruction transmitted by the singlechip 203.
4. A satellite channel multiplexing-based digital information transmission system according to claim 3, wherein the satellite antenna (201) is a small aperture reflector antenna or a patch antenna, on which an integrated down converter is mounted, receiving a satellite carrier signal.
5. The digital information transmission system based on satellite channel multiplexing according to claim 3, characterized in that the remote controlled device (204) is a device that accepts a remote control command from the remote device central management machine (101) and executes the remote control command; the remote controlled equipment (204) is an information terminal such as a street lamp, a signal lamp, an electronic placard, an alarm and the like.
6. The transmission method of a satellite channel multiplexing-based digital information transmission system according to claim 1, characterized by comprising a process of issuing remote control information by the satellite uplink station (100) and a process of receiving remote control information by the remote-end single-receiver device (200); wherein,
the steps of the release process are as follows:
1): the interface/protocol adaptation module (106) converts the remote control instruction of the remote equipment centralized management machine (101) into remote control instruction information in a TS stream data format;
2): the TS flow multiplexer (103) multiplexes the digital content information output by the multimedia signal source (102) and the remote control instruction information output by the interface/protocol adaptation module (106) to synthesize a broadband composite TS data flow;
3): a modulator (104) performs channel coding on the baseband signal in the TS stream data format and converts the baseband signal into a waveform suitable for satellite channel transmission;
4) the radio frequency unit (105) processes the radio frequency signal from the modulator (104) and then transmits the processed signal;
the receiving process comprises the following steps:
1): a satellite antenna (201) receives a satellite carrier containing remote control information;
2): the RF receiving module (202) searches carrier waves and completes channel demodulation to obtain the remote control information of the multiplexed TS stream data format;
3): the singlechip (203) separates the channels of the remote control information in the multiplexing, extracts the remote control instruction, and converts the remote control instruction into a format which can be accepted by the remote controlled equipment (204);
4): the remote controlled device (204) receives the remote control command and executes the remote control command.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101075752A (en) * | 2006-05-19 | 2007-11-21 | 上海航天卫星应用有限公司 | Satellite controlling system of photovoltaic power station |
| CN101136683A (en) * | 2007-09-28 | 2008-03-05 | 上海广电通讯网络有限公司 | Civil defence warning information and signal satellite distribution system |
| US20100194630A1 (en) * | 2006-03-30 | 2010-08-05 | Itt Manufacturing Enterprises, Inc. | Optimized Beamforming for Satellite Communication |
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2011
- 2011-01-25 CN CN2011100264932A patent/CN102611490A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100194630A1 (en) * | 2006-03-30 | 2010-08-05 | Itt Manufacturing Enterprises, Inc. | Optimized Beamforming for Satellite Communication |
| CN101075752A (en) * | 2006-05-19 | 2007-11-21 | 上海航天卫星应用有限公司 | Satellite controlling system of photovoltaic power station |
| CN101136683A (en) * | 2007-09-28 | 2008-03-05 | 上海广电通讯网络有限公司 | Civil defence warning information and signal satellite distribution system |
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