CN203761386U - Ship-borne satellite broadband communication modem in mode of code division multiple access - Google Patents
Ship-borne satellite broadband communication modem in mode of code division multiple access Download PDFInfo
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- CN203761386U CN203761386U CN201320882206.2U CN201320882206U CN203761386U CN 203761386 U CN203761386 U CN 203761386U CN 201320882206 U CN201320882206 U CN 201320882206U CN 203761386 U CN203761386 U CN 203761386U
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Abstract
The utility model relates to a ship-borne satellite broadband communication modem in a mode of code division multiple access, and the modem comprises a housing, an LCD display screen disposed on the housing, a keyboard, an RS-485 interface, and an internal circuit which is installed in the housing and comprises a transmitting signal processing unit, a receiving signal processing unit, and a processing unit. The transmitting signal processing unit comprises a signal source interface, a framer, an encoder, and a spread spectrum modulator, wherein the signal source interface, the framer, the encoder and the spread spectrum modulator are sequentially connected. The receiving signal processing unit comprises a spread spectrum demodulator, a decoder, a signal distributor, and a terminal interface, wherein the spread spectrum demodulator, the decoder, the signal distributor and the terminal interface are sequentially connected together. The processing unit comprises a processing chip, a display unit, an operating unit, a PN coder injector, and a power unit, wherein the display unit, the operating unit, the PN coder injector and the power unit are respectively connected with the processing chip. The modem provided by the utility model can prevent the electromagnetic interference of a ship, is high in possibility, and provides technical support for the secret communication of the ship.
Description
Technical field
The utility model belongs to the boat-carrying satellite broadband communication modulator-demodulator in boat-carrying satellite communication technology field, particularly a kind of code division multiple access coded system.
Background technology
For the mobile boats and ships away from land, as realized the enforcement communication of big data quantity, in known technical scope, non-satellite communication does not belong to.In the boats and ships communication technology of satellite of having applied, INMARSAT FB) and the direct boat-carrying VSAT equipment of the VSAT system of land extensive use being moved to boats and ships the FB system that mainly contains International Maritime Satellite Organization (is called for short:, two kinds of systems respectively have pluses and minuses, but all can not meet the high-speed communication of the following big data quantity of boats and ships completely.Now be described below respectively:
INMARSAT FB, be operated in L-band, provide QOS to guarantee IP rate business (Stream IP) (32,64,128,256kbps), single equipment data communication rates maximum speed can reach 432kbps, two-way note and Voice Mail Service are provided, can realize message, Call Waiting, shift, forbid, maintenance etc.Equipment adapts to Jobs on the sea environment.But because it is operated in L-band, frequency spectrum resource is limited, define the terminal quantity that synchronization participates in communication, so, have to utilize lever of price limited subscriber big data quantity to use, with the normal operation of safeguards system.
VSAT system is comprised of outdoor unit and indoor unit.Outdoor unit is radio-frequency apparatus, comprises small aperture antenna, Up/Down Conversion device and various amplifier; Indoor unit is intermediate frequency and baseband equipment, comprises modulator-demodulator, coder etc., its concrete composition because of the different slightly differences of type of service.VSAT system works is at c, ku or ka wave band, particularly ku or ka wave band equipment, and because its frequency spectrum resource is abundant, development in recent years is rapid.But because boat-carrying VSAT equipment is directly to be converted by land-bound equipment, there is the situation of this special movement carrier of ship in many inadaptable motions, particularly in boat-carrying VSAT system, the working method of modulator-demodulator is multi-frequency time division multiple access access (MF-TDMA), in this manner, each user terminal is shared the carrier wave of a series of different rates, each carrier wave carries out time slot division, so it is synchronous that existence needs to realize the whole network on a plurality of carrier waves, the shortcomings such as resource allocation algorithm complexity, again owing to being multicarrier work, the impact that therefore can bring intermodulation noise, antenna aperture can not be too small, guarantee many defects such as certain transmitting power.And, prior art is mainly used in land network, do not consider the boats and ships specific demands such as power supply supply in emergency circumstances, rescue communication, can not meet better the features such as anti-interference, volume is little, lightweight, case of emergency adaptation powered battery of boat-carrying broadband communications requirement.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, and proposes a kind of boat-carrying satellite broadband communication modulator-demodulator of code division multiple access coded system.
The utility model solves its technical problem and takes following technical scheme to realize:
A kind of boat-carrying satellite broadband communication modulator-demodulator of code division multiple access coded system, comprise housing, front panel top at housing is provided with LCD display, in LCD display bottom, be shaped with keyboard, on the right side of housing, be shaped with RS-485 interface, the internal circuit that comprises the processing unit that transmits, receives signal processing unit and processing unit formation is installed in enclosure interior
Wherein, the processing unit that transmits comprises connecting signal source interface, framer, encoder and spread spectrum modulator successively;
Wherein, receive signal processing unit and be the signal reduction process unit of processing unit of transmitting, comprise the extended frequency demodulator, decoder, signal distributor and the terminal interface that connect successively;
Wherein, processing unit comprises process chip and the display unit being connected with process chip respectively, operating unit, PN note code device and power subsystem.
And, described in the each several part that processing unit comprises that transmits there is following characteristic:
Described signal source interface: process for completing the early stage of various signals, comprise the access interface of the access of phone call/facsimile signal, the access interface of all kinds of numeric type signal sources and IP network signal;
Described framer: be responsible for the signal of different nature processing of pack, the desired digital signal one by one of formation encoder; The effect of encoder has been the coding of the signal one by one sent here of framer, for next stage spread spectrum modulator is done early-stage preparations;
Described encoder: comprise RS encoder and FEC encoder, the signal that they are sent here previous stage respectively carries out the coding work of standard separately;
Described spread spectrum modulator: the pseudo-code signal that its adopts spread spectrum that the frame signal after FEC coding and PN note yard device are sent here carries out the band spectrum modulation of have something to base on, generation comprises the wide-band modulation intermediate-freuqncy signal of pseudo-code, gives satellite power amplifier after over level set handling.
And the each several part that described reception signal processing unit comprises has following characteristic:
Described extended frequency demodulator: be that the intermediate-freuqncy signal after satellite antenna reception & disposal is removed to pseudo-code, the useful signal of original information also, it carries out the setting of PN note code device by give process chip according to the pilot signal receiving, make it produce the pseudo-code ordered series of numbers identical with transmitting terminal band spectrum modulation and give spread spectrum decoder, spread spectrum decoder is carried out demodulation by the pseudo-code ordered series of numbers signal of delivering to PN note code device to received signal, takes out and only contains the useful signal of FEC coding and give fec decoder device;
Described decoder: comprise fec decoder device and RS decoder, they complete the decoding task of standard separately, finally take out the various signals of communications;
Described signal distributor: be that the various types of signal after demodulation is distributed to corresponding interface circuit;
Described terminal interface: be responsible for connecting terminal equipment;
And the each several part that described processing unit comprises has following characteristic:
Described display unit is the LCD display that is arranged on housing front panel top;
Described operating unit is the keyboard that is arranged on housing LCD display below;
Described process chip can be selected single-chip microcomputer;
Described PN note code device: for generation of pseudo-code ordered series of numbers signal, PN note code device is connected with spread spectrum decoder with spread spectrum coder respectively;
Described power subsystem: for this equipment provides various stabilized voltage power supplys.
Advantage of the present utility model and good effect are
1, modulator-demodulator of the present utility model adopts code division multiple access coded system antagonism ship electromagnetic environment, marine multipath to disturb, thereby for the rate of boat-carrying VSAT equipment reduces, volume reduces to provide theoretic possibility.
2, modulator-demodulator of the present utility model adopts code division multiple access coded system, for the secure communication of special boats and ships provides technical guarantee.
3, the utility model adopts the DC24V power supply system of ship universal, is convenient to emergency power supply access, when marine generator breaks down, ensures that communication is unimpeded.
4, modulator-demodulator of the present utility model provides special-purpose voice channel, this voice channel both can provide normal speech communication, facsimile, in the time of can working as data network cisco unity malfunction again, be directly communicated to other communication network, adapt to boats and ships emergency communication demand.
Accompanying drawing explanation
Fig. 1 is the external structure schematic diagram of utility model;
The internal circuit schematic diagram of Fig. 2 the utility model modulator-demodulator.
Embodiment
Below in conjunction with accompanying drawing, the utility model is implemented to be further described, following examples are descriptive, are not determinate, can not limit protection range of the present utility model with this.
A kind of boat-carrying satellite broadband communication modulator-demodulator of code division multiple access coded system, as shown in Figure 1, comprise housing 1, on the front panel top of housing, LCD display 2 is installed, in LCD display plate bottom, be shaped with keyboard 3, on the right side of housing, be shaped with RS-485 interface, configuration and running status for remote monitoring terminal, be provided with internal circuit in enclosure interior, as shown in Figure 2, described circuit comprises the processing unit that transmits, receives signal processing unit and processing unit formation
Wherein, the processing unit that transmits comprises connecting signal source interface circuit, framer, encoder and spread spectrum modulator successively;
Signal interface circuit: process for completing the early stage of various signals, comprise the access of phone call/facsimile signal, the access of the access of all kinds of numeric type signal sources, IP network signal;
Framer: be responsible for the processing of pack of 3 class signal of different nature, the desired digital signal one by one of formation encoder; The effect of encoder has been the coding of the signal one by one sent here of framer, for next stage spread spectrum modulator is done early-stage preparations;
Encoder: comprise RS encoder (being also Linear codes rotary encoder, Reed-Solomon encoder); , FEC encoder (being also error correcting encoder Forward Error Correction encoder forward), the signal that they are sent here previous stage respectively carries out the coding work of standard separately;
Spread spectrum modulator: the core that is this modulator-demodulator, Novel Communication pattern is to be achieved in this modulator, it adopts spread spectrum that the frame signal after FEC coding and PN note code device (being also the white noise note code device Pseudo-Noise codegenerator) pseudo-code signal of sending here are carried out to the band spectrum modulation of have something to base on, generation comprises wide-band modulation intermediate frequency (IF) signal of pseudo-code, after the links such as over level arranges are processed, gives satellite power amplifier.
Wherein, receive signal processing unit and be the signal reduction process unit of processing unit of transmitting, comprise the extended frequency demodulator, decoder, signal distributor and the terminal interface circuit that connect successively,
Extended frequency demodulator: be by the pseudo-code of removing of the intermediate frequency after satellite antenna reception & disposal (IF) signal, go back the useful signal of original information; It carries out the setting of PN note code device by give program processor according to the pilot signal receiving, make it produce the pseudo-code ordered series of numbers identical with transmitting terminal band spectrum modulation and give spread spectrum decoder, spread spectrum decoder is carried out demodulation by the pseudo-code ordered series of numbers signal of delivering to PN note code device to received signal, takes out and only contains the useful signal of FEC coding and give fec decoder device;
Decoder: comprise fec decoder device and RS decoder, they complete the decoding task of standard separately, finally take out the various signals of communications;
Signal distributor: be that the various types of signal after demodulation is distributed to corresponding interface circuit;
Terminal interface circuit: be responsible for connecting terminal equipment;
Wherein, processing unit comprises process chip and the display unit being connected with process chip respectively, operating unit, PN note code device and power subsystem.
Described display unit is the LCD display that is arranged on housing front panel top;
Described operating unit is the keyboard that is arranged on housing LCD display below;
Described process chip can be selected single-chip microcomputer;
Described PN note code device: for generation of pseudo-code ordered series of numbers signal, PN note code device is connected with spread spectrum decoder with spread spectrum coder respectively;
Described power subsystem: for this equipment provides various stabilized voltage power supplys.
The utility model modulator-demodulator can provide 2 special-purpose voice channels, and this voice channel both can provide normal speech communication, facsimile, in the time of can working as data network cisco unity malfunction again, is directly communicated to other communication network.This channel adopts advanced digital voice compress technique, meets G.729 international standard, and transmission rate is 8kbps, and has built-in digital echo suppression equipment, and the telephone service of toll-quality can be provided.Voice channel can be configured to the interface of FXS or FXO standard at the scene, with PSTN or a PBX(PABX) be connected telephone service is provided.System also can be supported G3 Fax business by voice channel, and this transmission is the same with the telephone line of standard to the support of facsimile service.
Data channel is supported the synchrodata of 9.6kbps-1024kbps, terminal system is provided to the 10/100BaseT Ethernet interface of standard, and physical interface is RJ45, is connected the data service based on IP platform is provided with user data terminal.
Claims (4)
1. the boat-carrying satellite broadband communication modulator-demodulator of a code division multiple access coded system, it is characterized in that: comprise housing, front panel top at housing is provided with LCD display, in LCD display bottom, be shaped with keyboard, on the right side of housing, be shaped with RS-485 interface, the internal circuit that comprises the processing unit that transmits, receives signal processing unit and processing unit formation is installed in enclosure interior
Wherein, the processing unit that transmits comprises connecting signal source interface, framer, encoder and spread spectrum modulator successively;
Wherein, receive signal processing unit and be the signal reduction process unit of processing unit of transmitting, comprise the extended frequency demodulator, decoder, signal distributor and the terminal interface that connect successively;
Wherein, processing unit comprises process chip and the display unit being connected with process chip respectively, operating unit, PN note code device and power subsystem.
2. the boat-carrying satellite broadband communication modulator-demodulator of code division multiple access coded system according to claim 1, the each several part that the processing unit that transmits described in it is characterized in that comprises has following characteristic:
Described signal source interface: process for completing the early stage of various signals, comprise the access interface of the access of phone call/facsimile signal, the access interface of all kinds of numeric type signal sources and IP network signal;
Described framer: be responsible for the signal of different nature processing of pack, the desired digital signal one by one of formation encoder; The effect of encoder has been the coding of the signal one by one sent here of framer, for next stage spread spectrum modulator is done early-stage preparations;
Described encoder: comprise RS encoder and FEC encoder, the signal that they are sent here previous stage respectively carries out the coding work of standard separately;
Described spread spectrum modulator: the pseudo-code signal that its adopts spread spectrum that the frame signal after FEC coding and PN note yard device are sent here carries out the band spectrum modulation of have something to base on, generation comprises the wide-band modulation intermediate-freuqncy signal of pseudo-code, gives satellite power amplifier after over level set handling.
3. the boat-carrying satellite broadband communication modulator-demodulator of code division multiple access coded system according to claim 1, is characterized in that the each several part that described reception signal processing unit comprises has following characteristic:
Described extended frequency demodulator: be that the intermediate-freuqncy signal after satellite antenna reception & disposal is removed to pseudo-code, the useful signal of original information also, it carries out the setting of PN note code device by give process chip according to the pilot signal receiving, make it produce the pseudo-code ordered series of numbers identical with transmitting terminal band spectrum modulation and give spread spectrum decoder, spread spectrum decoder is carried out demodulation by the pseudo-code ordered series of numbers signal of delivering to PN note code device to received signal, takes out and only contains the useful signal of FEC coding and give fec decoder device;
Described decoder: comprise fec decoder device and RS decoder, they complete the decoding task of standard separately, finally take out the various signals of communications;
Described signal distributor: be that the various types of signal after demodulation is distributed to corresponding interface circuit;
Described terminal interface: be responsible for connecting terminal equipment.
4. the boat-carrying satellite broadband communication modulator-demodulator of code division multiple access coded system according to claim 1, is characterized in that the each several part that described processing unit comprises has following characteristic:
Described display unit is the LCD display that is arranged on housing front panel top;
Described operating unit is the keyboard that is arranged on housing LCD display below;
Described process chip can be selected single-chip microcomputer;
Described PN note code device: for generation of pseudo-code ordered series of numbers signal, PN note code device is connected with spread spectrum decoder with spread spectrum coder respectively;
Described power subsystem: for this equipment provides various stabilized voltage power supplys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320882206.2U CN203761386U (en) | 2013-12-25 | 2013-12-25 | Ship-borne satellite broadband communication modem in mode of code division multiple access |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320882206.2U CN203761386U (en) | 2013-12-25 | 2013-12-25 | Ship-borne satellite broadband communication modem in mode of code division multiple access |
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| CN203761386U true CN203761386U (en) | 2014-08-06 |
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| CN201320882206.2U Expired - Fee Related CN203761386U (en) | 2013-12-25 | 2013-12-25 | Ship-borne satellite broadband communication modem in mode of code division multiple access |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960606A (en) * | 2017-03-16 | 2017-07-18 | 青岛科恩锐通信息技术股份有限公司 | A kind of low-power consumption is coastal and inland navigation craft management system |
| CN108254769A (en) * | 2018-03-23 | 2018-07-06 | 中国电子科技集团公司第五十四研究所 | A kind of navigation signal generation method of time-division system |
-
2013
- 2013-12-25 CN CN201320882206.2U patent/CN203761386U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960606A (en) * | 2017-03-16 | 2017-07-18 | 青岛科恩锐通信息技术股份有限公司 | A kind of low-power consumption is coastal and inland navigation craft management system |
| CN108254769A (en) * | 2018-03-23 | 2018-07-06 | 中国电子科技集团公司第五十四研究所 | A kind of navigation signal generation method of time-division system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20191225 |