CN108234660A - The marine wireless chart update system and method for high frequency - Google Patents
The marine wireless chart update system and method for high frequency Download PDFInfo
- Publication number
- CN108234660A CN108234660A CN201810015366.4A CN201810015366A CN108234660A CN 108234660 A CN108234660 A CN 108234660A CN 201810015366 A CN201810015366 A CN 201810015366A CN 108234660 A CN108234660 A CN 108234660A
- Authority
- CN
- China
- Prior art keywords
- chart
- broadcasts
- bank base
- sea
- broadcast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Computing Systems (AREA)
- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of wireless chart update system and methods of marine high frequency, including broadcasting control terminal, bank base broadcasts platform, sea chart receives terminal, it broadcasts control terminal and is connected with data server, bank base broadcasts platform and is connected with bank base network, it broadcasts control terminal and data server platform is broadcast with bank base by bank base network and connect, bank base, which broadcasts platform and receives terminal with sea chart by wireless transmission channel, to be connected.Sea chart file can easily be transmitted, and it is seamlessly connected with ship information system and equipment, it broadcasts efficient, broad covered area, the present invention is by directly broadcasting electronic chart correcting information, the mode of file is constantly received on ship to cut down the number of intermediate links, reduces crewman's workload, improves the promptness and accuracy of chart correction.
Description
Technical field
The present invention relates to maritime safety information broadcast technology fields, and in particular to a kind of sea wireless chart update system of high frequency
System and method.
Background technology
In order to ensure navigation safety, need timely and effectively from providing related sea going peace to the ship of navigation on the bank
Full information, maritime safety information (MSI---Maritime Safety Information) refer to navigational warning, weather forecast,
Weather forecast and other emergency safety information in relation to navigation safety.Relevant department is by the important information in relation to navigation safety on the bank
By NAVTEX coastal stations or INMARSAT, the ship to main marine site is broadcast.
Existing navigational warning and notice to navigator mainly by coastal each coastal station broadcast Morse telegram with
NAVTEX platforms broadcast the publication that NBDP radio teletypes realize information, and also there is technological means to fall for both information publication means
Afterwards, the shortcomings that timeliness is difficult to ensure, covering surface is small, ship cannot in time, comprehensively and systematically understand the safety letter in navigation marine site
There is very big hidden danger for navigation safety, be not suitable with the needs of advanced information society's demand for development in breath.
For example traditional marine ships chart update needs CD mailing or the mailing of download online dish, spends the time long,
Update cycle is long, it is impossible to which timely and effectively more new chart file, marine ships can not obtain the required sea chart of publication in time
Update file, message are often what is lagged, and in Zhujiang River Mouth Waters number cause occur within 2017, more new chart does not lead to shipwreck
Situation, to navigation safety and Navigation in Navigable, there are greater risks and hidden danger as a result,.
Equally, International Association of Lighthouse Authorities (The International Association of Marine Aids to
Navigation and Lighthouse Authorities, IALA) and International Maritime Organization (IMO) important maritime communication
Key broadcasts technology and data transmission channel, such as：High frequency NAVDAT systems, therefore, the communication data that can be broadcast passes through day
Wave is propagated, and can cover the whole world, as shown in Figure 8.
Invention content
The technical problem to be solved by the present invention is in view of the foregoing defects the prior art has, provide a kind of marine high
Frequency is wireless chart update system and method, can easily transmit sea chart file, and with ship information system and the seamless company of equipment
It connects, broadcasts efficient, broad covered area, the present invention constantly receives file by directly broadcasting electronic chart correcting information on ship
Mode is cut down the number of intermediate links, and reduces crewman's workload, improves the promptness and accuracy of chart correction.
The used to solve above-mentioned technical problem technical solution of the present invention is：
A kind of wireless chart update system of sea high frequency, including broadcasting control terminal, bank base broadcasts platform, sea chart receives eventually
End, broadcasts control terminal and is connected with data server, and bank base broadcasts platform and is connected with bank base network, broadcasts control terminal and data clothes
Business device is broadcast platform with bank base by bank base network and is connect, and bank base broadcasts platform and receives terminal phase by wireless transmission channel and sea chart
Even；
Wherein, it broadcasts control terminal and is taken for all sea charts to be broadcast file distribution to data server, then by data
The file for needing to issue is sent to bank base and broadcasts platform by business device；Bank base broadcasts sea chart of the platform reception from data server and broadcasts text
Sea chart is broadcast file and is converted into ofdm signal by part, and is passed through high frequency radio signal and received terminal broadcast to sea chart.
According to above-mentioned technical proposal, broadcast control terminal also has long-range monitoring receiver by bank base network connection, remotely
For monitoring receiver for receiving high frequency radio signal, and demodulate ofdm signal, monitoring receives the quality of signal, and is reported to and broadcasts
Control terminal is sent out, while data processing and analysis are carried out to monitoring received signal, analysis, which is compared, broadcasts performance indicator.
According to above-mentioned technical proposal, bank base broadcasts platform and includes the first controller, modulator, RF generators and RF amplifiers,
The clock end of first controller is connected with clock module, and the input terminal of the first controller is connect with long-range monitoring receiver, and first
The output terminal of controller is connect successively with modulator, RF generators and RF amplifiers, RF amplifiers be used for by matching unit with
Transmitting antenna connects, network-side and the bank base network connection of the first controller.
According to above-mentioned technical proposal, clock module is any one in GNSS receiver, Beidou receiver and atomic clock.
According to above-mentioned technical proposal, modulator is OFDM modulators.
According to above-mentioned technical proposal, broadcast control terminal and be additionally operable to that monitoring bank base broadcasts platform working condition and control bank base is broadcast
Send out platform running parameter；Control terminal is broadcast to be additionally operable to receive the work that bank base broadcasts the monitoring data of platform transmission and bank base broadcasts platform
State, while broadcast reception data of the control terminal according to long-range monitoring receiver, what monitoring bank base broadcast platform broadcasts quality.
According to above-mentioned technical proposal, bank base broadcast platform working condition include transmitting confirm, alarm, effective transmission power and same
Step report, bank base broadcast platform running parameter and include transmission power, pilot sub-carrier, subcarrier modulation modes, Error Correction of Coding mode
And transmitting sequence.
According to above-mentioned technical proposal, sea chart receives terminal and includes second controller, ofdm demodulator and radio-frequency front-end, and second
The input terminal of controller is connect with ofdm demodulator, and ofdm demodulator is connect by radio-frequency front-end with high frequency receiving antenna, and second
The output terminal of controller is connected with display unit and data-interface.
According to above-mentioned technical proposal, data-interface is Ethernet interface and/or USB interface.
According to above-mentioned technical proposal, radio-frequency front-end includes being sequentially connected RF wave filters, RF amplifiers and base band output, radio frequency
Front end is exported by RF wave filters, RF amplifiers and base band, and the RF signals from antenna are filtered, amplify and are converted；It connects
Receiving frequency is：2MHz-2.3MHz.
A kind of chart update method using above-described chart update system includes the following steps：
S1：All sea charts are broadcast into file and are published to data server by broadcasting control terminal, by data server
The sea chart issued will be needed to broadcast file and be sent to bank base and broadcast platform；
S2：Bank base broadcasts sea chart of the platform reception from data server and broadcasts file, and sea chart is broadcast file is converted into
Ofdm signal, and pass through high frequency radio signal and receive terminal broadcast to sea chart；
S3：Sea chart receives the signal that terminal will be received by antenna and receiver, and carries out data processing to signal
It is reduced to correct chart update file.
According to above-mentioned technical proposal, sea chart broadcasts the electronic nautical chart that file is S-57 forms, is broadcast in the step S1
Chart correction information of the control terminal in notices to mariners is fabricated to electronic chart ENC amendment files, the ENC amendment files
Including basic data EN and/or update the data ER；The step S3 be sent to after receiving electronic chart display and infor mation system into
Row confirms display；ENC is Electronic Navigational Charts electronic charts.
According to above-mentioned technical proposal, in the step S2 bank base broadcast platform using 2MHz-2.3MHz frequency ranges transmitting high frequency without
Line electric signal, the modulated process of high frequency radio signal are as follows：Mixing adds in Direct Sequence Spread Spectrum and frequency hopping on ofdm signal
Spread spectrum, then the signal after capturing, tracking and complete spread spectrum with carrier synchronization is synchronous, and QAM modulation is carried out to each subcarrier,
Modulation system includes 64-QAM, 16-QAM and 4-QAM.
According to above-mentioned technical proposal, used in the subcarrier inserted with pilot signal sequence, the pilot signal sequence
Oem character set mode is distributed；Sea chart receives terminal and carries out the entire channel of channel estimation acquisition using pilot signal in the step S3
Response；After frequency domain data is obtained, the least square between the channel estimated at pilot frequency locations and actual channel is first asked for
Then estimated result obtains the channel estimation results of data portion by low-pass filtering interpolation, together with the letter using pilot tone estimation
It makes an uproar more balanced than carrying out, the complete information of frequency domain equalization carries out soft decoding by decoder, then returns to balanced device by remapping,
It repeats the above process until iteration is completed.
The invention has the advantages that：
The wireless chart update system and method for sea high frequency provided by the invention, can easily transmit sea chart file, and
It is seamlessly connected with ship information system and equipment, broadcasts efficient, broad covered area.In addition, the present invention is by directly broadcasting electronics
Chart correction information constantly receives the mode of file to cut down the number of intermediate links on ship, reduces crewman's workload, improves chart correction
Promptness and accuracy.
Description of the drawings
Fig. 1 is the general frame schematic diagram of the wireless chart update system of marine high frequency in the embodiment of the present invention；
Fig. 2 is the circuitry block schematic diagram that bank base broadcasts platform in the embodiment of the present invention；
Fig. 3 is the circuitry block schematic diagram that sea chart receives terminal in the embodiment of the present invention；
Fig. 4 is the frequency domain spread spectrum ofdm signal schematic diagram used in the embodiment of the present invention；
Fig. 5 is oem character set pilot cell distribution schematic diagram in the embodiment of the present invention；
Fig. 6 is channel estimation schematic diagram in the embodiment of the present invention；
Fig. 7 is iterative equalization process flow diagram in the embodiment of the present invention；
Fig. 8 is the operation principle chart of medium-high frequency NAVDAT systems of the embodiment of the present invention；
In figure, 1- data servers, 2- broadcasts control terminal, 3- bank base networks, and 4- bank bases broadcast platform, and remotely monitoring connects 5-
Receipts machine, 6- sea charts reception terminal, the first controllers of 7-, 8-GNSS receivers or reference clock, 9- modulators, 10-RF generators,
11-RF amplifiers, 12- matching units, 13- transmitting antennas, 14- second controllers, 15-OFDM demodulators, 16- radio-frequency front-ends,
17- high frequency receiving antennas, 18- display units, 19- data-interfaces.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
With reference to shown in Fig. 1~Fig. 7, the wireless chart update system of marine high frequency in one embodiment provided by the invention,
Including：
Broadcast control terminal 2：All sea charts are broadcast into file distribution to data server 1, it need to by data server 1
The file to be issued is sent to bank base and broadcasts platform 4；
Bank base broadcasts platform 4：It receives the sea chart from data server 1 and broadcasts file, sea chart is broadcast file is converted into
Ofdm signal, and pass through high frequency radio signal and broadcasted to sea chart reception terminal 6；
Sea chart receives terminal 6：The signal that will be received by antenna and receiver, is reduced to correctly by data processing
Chart update file；
It is described broadcast control terminal 2 and broadcast platform 4 with bank base be connected by bank base network 3, the bank base broadcasts platform 4 and passes through nothing
Line transmission channel receives terminal 6 with sea chart and is connected.
The control terminal 2 of broadcasting of the present invention is connect by network with broadcasting platform, can monitor the following state for broadcasting platform：A) it sends out
Penetrate confirmation；B) it alerts；C) effective transmission power；D) synchronization report.Control terminal 2 is broadcast also to receive by network and long-range monitoring
Machine 5 connects, and receives remote receiver data, and what monitoring bank base broadcast platform 4 broadcasts quality.It broadcasts control terminal 2 and changes transmitter
Parameter, such as：A) transmission power；B) OFDM parameters (pilot sub-carrier, subcarrier modulation modes, Error Correction of Coding mode etc.)；c)
Transmitting sequence.
The mode that broadband connection, low rate connection or local file are shared can be used in the bank base network 3 of the present invention.Bank base is broadcast
Send out platform 4 (by access protection local server) composition as shown in Fig. 2, including：A) first controller 7, to be protected by access
The local server of shield；B) an OFDM modulator 9；C) the RF generators 10 and amplifier of a 2MHz-2.3MHz frequency range；d)
The transmitting antenna 13 of one subband matching unit 12；E) GNSS receiver, Beidou receiver or an atomic clock for synchronization；f)
One monitoring receiver with antenna.
The first controller 7 that the bank base of the present invention broadcasts platform 4 receives following information：A) message file from SIM；B) come
From the time synchronization information of GNSS receiver, Beidou receiver or reference clock；C) 2MHz-2.3MHz from monitoring receiver
Signal；D) the 2MHz-2.3MHz signals from modulator 9；E) monitoring signals from RF generators 10 and amplifier.
The major function of the first controller 7 that the bank base of the present invention broadcasts platform 4 is as follows：A) related frequency range is checked before transmission
It is whether idle；B) all signals that bank base is broadcast to platform 4 are synchronous with synchronizing clock signals；C) controlling transmission parameter, time and sequence
Row；D) message file that need to emit by grouping transmission requirement formatting.
The modulator 9 that the present invention uses needs three kinds of inlet flows：
A) modulation intelligence stream (MIS), MIS always using 4-QAM subcarrier-modulateds, provide following information：1) frequency spectrum occupies；
2) modulation system (4-, 16- or 64-QAM) of transmitter information stream (TIS) and data flow (DS).
B) 4- or 16-QAM subcarrier-modulateds can be used in transmitter information stream (TIS), TIS stream, are provided to receiver following
Information：1) data flow (DS) Error Correction of Coding mode (earthwave of the propagation of ground wave and night for daytime+sky wave propagation situation,
The Error Correction of Coding of use should be differentiated)；2) mark of transmitter；3) date and time.
C) data flow (DS), comprising the message file to be sent, and this document has passed through file multiplexer before this
It formats, modulator 9 encodes input traffic by data stream encoding form.
To ensure the robustness of transmission, mechanism for correcting errors should be used.In view of efficiency of transmission, according to mechanism for correcting errors and modulation mould
The difference of formula, code check can change between 0.5~0.75.Three kinds of inlet flows such as MIS, TIS and DS are to encode and the shape of energy dissipation
Formula is formatted.OFDM mappers are mapped by unit sets up OFDM units, inlet flow and pilot cell including formatting.
Receiver can utilize pilot cell assessment radio channel and synchronous RF signals.OFDM base band generator is according to the output of mapper
Generate OFDM baseband signals.
RF generators 10：The output that baseband signal is transformed to 2MHz-2.3MHz by 2MHz-2.3MHz RF generators 10 carries
In wave, RF signals are amplified to desired power by exciting amplifier.
RF amplifiers 11：The 2MHz-2.3MHz signals that generator exports are amplified to necessary power, to meet required nothing
The covering requirement of line electricity.To meet information errors rate (MER) requirement, the crest factor of 11 output terminal of RF amplifiers should be controlled in 6dB
~12dB.
Transmitting antenna 13 with matching unit 12：Transmitting antenna 13 should have impedance matching unit 12, and RF amplifiers 11 are defeated
Go out matching connection unit 12, be then connected to transmitting antenna 13.
GNSS receiver, Beidou receiver and backup atomic clock：The clock is used to synchronize local controller.Monitoring receiver
Check whether correlated frequency is idle before transmission, and available for checking RF transmittings.
Continuing with referring to Fig. 3, sea chart of the invention receives terminal 6 and mainly includes following essential part：A) high frequency connects
Receive antenna；B) radio-frequency front-end 16；C) ofdm demodulator 15；D) second controller 14；E) display unit；F) data-interface.Each list
The major function of member and realization are as follows.
First, high frequency receiving antenna
The electric field of receives frequency range covering 2MHz-2.3MHz or the antenna in magnetic field, preferably cover 2.1MHz, 2.2MHz, with
Just with NAVTEX common antennas.Numerous studies show the transmission field strength attenuation of the sea earthwave of high frequency 2MHz-2.3MHz frequency ranges
Slowly, it propagates and stablizes, weather is adaptable, has very good overwater propagation characteristic.
2nd, radio-frequency front-end 16
Radio-frequency front-end 16 includes RF wave filters, RF amplifiers 11 and base band output, and the RF signals from antenna are filtered
Wave, amplification and transformation, to meet demodulation requirement.Has highly sensitive and high dynamic range.
3rd, ofdm demodulator 15：Ofdm signal is demodulated, to recover the data flow of DS, MIS and TIS, is created again
Build the data flow for including the message file sent.
This stage implements：A) time/frequency synchronizes；B) channel estimating；C) automatic Modulation restores；D) error correction.NAVDAT is (high
The marine digit broadcasting system of frequency) receiver should be able to detect following modulation parameter automatically：A) 16- or 64-QAM；b)
Sub-carrier scheme；C) mode of Error Correction of Coding.In addition to DS, it is also responsible for reporting the letter filled in TIS and MIS
Breath.In addition, the receiver also reports the following supplemental information in relation to channel：A) SNR estimated；b)BER；c)MER.
4th, second controller 14
A) win message file from DS (by packet combining into file)；
B) other information that TIS and MIS and demodulator provide is explained；
C) file demultplexer：1) message file is received；2) ensure to mark the message file (broadcast mode that it is asked to pay attention to
Type)；3) message file is decrypted in the case of necessary/feasible；4) message file is supplied to the terminal using these files
Using；5) expired message file is deleted.
D) following information is collected：1) total amount of message file has been decoded；2) quantity of available message file；3) error event
(for example, decryption mistake).
Electronic nautical chart (ENC) is by the electron sea for meeting S-57 standards of the hydrographic department drafting of government authorization
Figure, ENC tools are there are two types of form, that is, basic data NE and update the data ER.Basic data and updating the data is shown together for electronic chart
Show and information system is received, to form the system electronic sea chart (SENC) of up-to-date information in reflection marine site, supplied for electronic sea chart is shown
Show and show and be correspondingly processed with information system ECDIS.Either basic data still updates the data, with the form of standard
Carrying out tissue and the encapsulation of data can be different so as to reach the electronic chart of the hydrographic survey mechanism of country variant making
It is accurately used on ECDIS.
The present invention also provides a kind of wireless chart update methods of marine high frequency, include the following steps：
S1：All sea charts are broadcast into file and are published to data server 1 by broadcasting control terminal 2, by data service
The file for needing to issue is sent to bank base and broadcasts platform 4 by device 1；
S2：Bank base, which broadcasts platform 4 and receives the sea chart from data server 1, broadcasts file, and sea chart is broadcast file is converted into
Ofdm signal, and pass through high frequency radio signal and broadcasted to sea chart reception terminal 6；
S3：Sea chart receives the signal that terminal 6 will be received by antenna and receiver, is reduced to just by data processing
True chart update file.
The present invention can easily with the Electronic Chart System (ECS) on ship equipment and electronic Chart Display and information system
(ECDIS) of system is seamlessly connected, and realizes that the visualization of maritime safety information is shown, carries out the application demonstration of e navigations.Specifically
Connection mode is as follows：
(1) the chart correction information in notices to mariners is fabricated to ENC amendment files (.00X files, S57 forms)；
(2) ENC amendment files are broadcast by NAVDAT systems；
(3) Shipborne terminal is sent to ECDIS after receiving.
(4) after manual confirmation, ECDIS carries out the correction of electronic chart automatically, is directly displayed on electronic chart, enhances ship
The automatization level of oceangoing ship information processing.
The wireless chart update method of sea high frequency provided by the invention, the bank base broadcast platform 4 using 2MHz-2.3MHz frequencies
Section transmitting radio signal.Due to high wave channel, there are serious weak and interference, it is therefore desirable to a kind of anti-interference, highly sensitive
Simultaneous techniques ensure the detection of signal.In order to resist the decline of signal channel, make there are one each subcarriers
Perfect demodulation need to estimate the response of the radio transmission channel of each subcarrier when receiving, and using balanced measure.
Continuing with referring to Fig. 4, signal modulation process of the present invention is as follows：Mixing adds in Direct Sequence Spread Spectrum and jump on OFDM
Frequency is spread, and then the signal after capturing, tracking and complete spread spectrum with carrier synchronization is synchronous, and QAM tune is carried out to each subcarrier
System, modulation system include 64-QAM, 16-QAM and 4-QAM.Due to the multi-carrier nature of OFDM so that direct sequence spread spectrum skill
It can be effectively combined with frequency hopping with OFDM technology.Frequency domain spread spectrum can be effective against frequency domain block type, absorption
Interference is generated by ionosphere by absorption including subcarrier in single-tone, narrowband interference and frequency band due to place Frequency point
Attenuation etc., so that it is guaranteed that medium wave signal low signal-to-noise ratio, there are interference with can also be realized under disturbed conditions it is quick and precisely synchronous.
The wireless chart update method of marine high frequency of the present invention, it is described inserted with pilot signal sequence in the subcarrier
Pilot signal sequence is distributed using oem character set mode, as shown in Figure 5.Wherein t represents time domain direction, and f represents frequency domain side
To；Black color dots represent frequency pilot sign, and white point then represents data subcarrier.For receiver, pilot signal is with the following functions：
A) it detects whether to receive signal；
B) estimate frequency deviation；
C) estimate radio transmission channel.
The quantity of pilot signal depends on desired signal robustness.In first symbol that each OFDM frames are sent, institute
There is subcarrier to be used as time reference, synchronization is provided for receiver.
The estimation of the available data rate of the present invention is as follows：In the transmission channel bandwidth of 2MHz-2.3MHz, 16-QAM tune
The typical original data rate of the data flow (DS) of system is in 10kbps or so.Horizontal for adjustment channel guard, the son for carrying data carries
Wave number amount can change.The channel guard of higher level can reduce the number of useful subcarrier (to anti-multipath, attenuation, delay etc.)
Amount.Raw data rate must be multiplied by Error Correction of Coding efficiency (i.e. code check), can just obtain effective data transfer rate.When code check is 0.5
When between~0.75, effective data rate is between 8kbps~10kbps.Higher code check can provide higher valid data
Rate, but radio coverage can be accordingly decreased.
The present invention mainly uses a pilot for channel estimation, and according to the design of transmitting terminal pilot frequency locations, receiving terminal channel is estimated
It scores as two steps：
A) channel estimation at pilot frequency locations
Channel estimating performance based on pilot tone be by the way that the error between the channel estimated and actual channel is weighed,
As shown in Figure 6.The method of estimation of minimum distance error under two variables preferably estimated using least square method, (x-x'
)2+(y-y')2It is minimum.
B) pilot interpolation algorithm
After the channel response that pilot frequency locations are obtained according to channel estimation method, by rational interpolation algorithm, so as to obtain
Obtain the response of entire channel.
The iteration equalizing technical finesse flow of the present invention is as shown in Figure 7：After frequency domain data is obtained, pilot frequency locations are first asked for
Locate LS (Least Square, least square) estimated result of channel, data portion is then obtained by low-pass filtering interpolation
Channel estimation results carry out equilibrium together with the signal-to-noise ratio estimated using pilot tone, and the complete information of frequency domain equalization is carried out by decoder
Then soft decoding returns to balanced device, such iteration by remapping.It is wherein balanced for the first time, due at this time without having decoded
Soft Inform ation later, therefore first time equilibrium is equivalent to a MMSE equilibrium, each equilibrium later is required for using decoding
Rear Soft Inform ation simultaneously re-starts equilibrium, until iteration is completed.
Although the present invention is disclosed as above with preferred embodiment, however, it is not to limit the invention, any this field skill
Art personnel, without departing from the spirit and scope of the present invention, when can make a little modification and it is perfect, therefore the present invention protection model
It encloses to work as and is subject to what claims were defined.
Above is only presently preferred embodiments of the present invention, cannot limit the interest field of the present invention with this certainly,
Therefore the equivalence changes made according to scope of the present invention patent, still belong to protection scope of the present invention.
Claims (10)
1. the wireless chart update system of a kind of sea high frequency, which is characterized in that including broadcasting control terminal, bank base broadcasts platform, sea
Figure receives terminal, broadcasts control terminal and is connected with data server, bank base broadcasts platform and is connected with bank base network, broadcasts control terminal
Platform is broadcast with data server with bank base by bank base network to connect, bank base is broadcast platform and connect by wireless transmission channel and sea chart
Terminal is received to be connected；
Wherein, control terminal is broadcast for all sea charts to be broadcast file distribution to data server, then by data server
The file for needing to issue is sent to bank base and broadcasts platform；Bank base broadcasts sea chart of the platform reception from data server and broadcasts file,
Sea chart is broadcast into file and is converted into ofdm signal, and passes through high frequency radio signal and receives terminal broadcast to sea chart.
2. the wireless chart update system of sea high frequency according to claim 1, which is characterized in that it is also logical to broadcast control terminal
Crossing bank base network connection has long-range monitoring receiver, and long-range monitoring receiver is used to receive high frequency radio signal, and demodulate
Ofdm signal, monitoring receive the quality of signal, and are reported to and broadcast control terminal, while carry out data to monitoring received signal
Processing and analysis, analysis, which is compared, broadcasts performance indicator.
3. sea high frequency wireless chart update system according to claim 2, which is characterized in that bank base broadcasts platform and includes the
One controller, modulator, RF generators and RF amplifiers, the clock end of the first controller are connected with clock module, the first control
The input terminal of device is connect with long-range monitoring receiver, and the output terminal of the first controller is put successively with modulator, RF generators and RF
Big device connection, RF amplifiers by matching unit with transmitting antenna for being connect, network-side and the bank base network of the first controller
Connection.
4. the wireless chart update system of sea high frequency according to claim 1, which is characterized in that broadcast control terminal and also use
Platform working condition is broadcast in monitoring bank base and control bank base broadcasts platform running parameter；Broadcast control terminal be additionally operable to receive bank base broadcast
The monitoring data and bank base that hair platform is sent broadcast the working condition of platform, while broadcast control terminal according to long-range monitoring receiver
Data are received, what monitoring bank base broadcast platform broadcasts quality.
5. the wireless chart update system of sea high frequency according to claim 4, which is characterized in that bank base broadcasts platform work shape
State includes transmitting confirmation, alarm, effective transmission power and synchronization report, and bank base broadcasts platform running parameter and includes transmission power, leads
Frequency subcarrier, subcarrier modulation modes, Error Correction of Coding mode and transmitting sequence.
6. the wireless chart update system of sea high frequency according to claim 1, which is characterized in that sea chart receives terminal and includes
Second controller, ofdm demodulator and radio-frequency front-end, the input terminal of second controller are connect with ofdm demodulator, ofdm demodulator
It is connect by radio-frequency front-end with high frequency receiving antenna, the output terminal of second controller is connected with display unit and data-interface.
A kind of 7. chart update method using chart update system described in claim 1, which is characterized in that including walking as follows
Suddenly：
S1：All sea charts are broadcast into file and are published to data server by broadcasting control terminal, it need to by data server
The sea chart to be issued, which broadcasts file and is sent to bank base, broadcasts platform；
S2：Bank base broadcasts sea chart of the platform reception from data server and broadcasts file, and sea chart is broadcast file is converted into OFDM letters
Number, and pass through high frequency radio signal and receive terminal broadcast to sea chart；
S3：Sea chart receives the signal that terminal will be received by antenna and receiver, and carries out data processing reduction to signal
For correct chart update file.
8. the wireless chart update method of sea high frequency according to claim 7, which is characterized in that sea chart broadcasts file as S-
The electronic nautical chart of 57 forms is broadcast chart correction information of the control terminal in notices to mariners in the step S1 and is fabricated to
Electronic chart ENC amendment files, the ENC amendment files include basic data EN and/or update the data ER；The step S3 connects
It electronic chart display and infor mation system is sent to after receipts carries out confirmation and show.
9. the wireless chart update method of sea high frequency according to claim 7, which is characterized in that bank base in the step S2
It broadcasts platform and high frequency radio signal is emitted using 2MHz-2.3MHz frequency ranges, the modulated process of high frequency radio signal is as follows：
Mixing adds in Direct Sequence Spread Spectrum and frequency hopping spread spectrum on ofdm signal, then completes spread spectrum by capture, tracking and carrier synchronization
Signal afterwards synchronizes, and QAM modulation is carried out to each subcarrier, and modulation system includes 64-QAM, 16-QAM and 4-QAM.
10. the wireless chart update method of sea high frequency according to claim 9, which is characterized in that inserted in the subcarrier
Entering has pilot signal sequence, and the pilot signal sequence is distributed using oem character set mode；Sea chart receives eventually in the step S3
End carries out the response of the entire channel of channel estimation acquisition using pilot signal；After frequency domain data is obtained, pilot frequency locations are first asked for
Then least-squares estimation between channel and actual channel that place estimates by low-pass filtering interpolation as a result, obtain data portion
The channel estimation results divided carry out equilibrium together with the signal-to-noise ratio estimated using pilot tone, and the complete information of frequency domain equalization passes through decoder
Soft decoding is carried out, then returns to balanced device by remapping, is repeated the above process until iteration is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810015366.4A CN108234660A (en) | 2018-01-08 | 2018-01-08 | The marine wireless chart update system and method for high frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810015366.4A CN108234660A (en) | 2018-01-08 | 2018-01-08 | The marine wireless chart update system and method for high frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108234660A true CN108234660A (en) | 2018-06-29 |
Family
ID=62643270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810015366.4A Pending CN108234660A (en) | 2018-01-08 | 2018-01-08 | The marine wireless chart update system and method for high frequency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108234660A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011893A (en) * | 2019-04-08 | 2019-07-12 | 武汉理工大学 | AIS device and method with the automatic upgrade function of electronic channel chart remote online |
| CN112333726A (en) * | 2020-12-04 | 2021-02-05 | 天津七一二通信广播股份有限公司 | Microwave equipment monitoring method based on frequency division technology |
| CN114136322A (en) * | 2021-11-19 | 2022-03-04 | 中国船舶重工集团公司第七0七研究所 | Large unmanned ship automatic route planning based on empirical navigation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101275277B1 (en) * | 2011-12-21 | 2013-06-18 | 한국해양과학기술원 | Route searching support system of ship for collision avoidance by using the generation of quadrilateral fairway units |
| CN106992828A (en) * | 2017-06-01 | 2017-07-28 | 上海埃威航空电子有限公司 | Marine intermediate frequency digital broadcast system |
| CN107040390A (en) * | 2017-06-01 | 2017-08-11 | 上海埃威航空电子有限公司 | The marine wireless chart update system and method for intermediate frequency |
| CN107124193A (en) * | 2017-06-01 | 2017-09-01 | 上海埃威航空电子有限公司 | Marine digital intermediate frequency receiving device |
| CN206743268U (en) * | 2017-06-01 | 2017-12-12 | 上海埃威航空电子有限公司 | The marine wireless chart update system of intermediate frequency |
-
2018
- 2018-01-08 CN CN201810015366.4A patent/CN108234660A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101275277B1 (en) * | 2011-12-21 | 2013-06-18 | 한국해양과학기술원 | Route searching support system of ship for collision avoidance by using the generation of quadrilateral fairway units |
| CN106992828A (en) * | 2017-06-01 | 2017-07-28 | 上海埃威航空电子有限公司 | Marine intermediate frequency digital broadcast system |
| CN107040390A (en) * | 2017-06-01 | 2017-08-11 | 上海埃威航空电子有限公司 | The marine wireless chart update system and method for intermediate frequency |
| CN107124193A (en) * | 2017-06-01 | 2017-09-01 | 上海埃威航空电子有限公司 | Marine digital intermediate frequency receiving device |
| CN206743268U (en) * | 2017-06-01 | 2017-12-12 | 上海埃威航空电子有限公司 | The marine wireless chart update system of intermediate frequency |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011893A (en) * | 2019-04-08 | 2019-07-12 | 武汉理工大学 | AIS device and method with the automatic upgrade function of electronic channel chart remote online |
| CN110011893B (en) * | 2019-04-08 | 2021-01-12 | 武汉理工大学 | AIS device and method with electronic channel chart remote online automatic upgrading function |
| CN112333726A (en) * | 2020-12-04 | 2021-02-05 | 天津七一二通信广播股份有限公司 | Microwave equipment monitoring method based on frequency division technology |
| CN114136322A (en) * | 2021-11-19 | 2022-03-04 | 中国船舶重工集团公司第七0七研究所 | Large unmanned ship automatic route planning based on empirical navigation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7809370B2 (en) | Space based monitoring of global maritime shipping using automatic identification system | |
| GB2280292A (en) | Multipoint to point radiocommunications network | |
| CN108234660A (en) | The marine wireless chart update system and method for high frequency | |
| CN106992828B (en) | Marine intermediate frequency digital broadcasting system | |
| CN107040390A (en) | The marine wireless chart update system and method for intermediate frequency | |
| CN109061675A (en) | A kind of air navigation aid based on satellite communication signals | |
| CN109348536A (en) | A kind of radio-interference signals automatic station-keeping system waterborne and localization method | |
| CN206743268U (en) | The marine wireless chart update system of intermediate frequency | |
| CN112910966A (en) | Maritime high-frequency anti-interference self-error-correction wireless chart updating method | |
| CN212012646U (en) | High-frequency circuit digitalization system for coastal radio station | |
| CN109088923B (en) | Open sea island reef environment monitoring system and decision-level fusion method | |
| CN107040270A (en) | Seashore Nifutis information distributing monitoring system | |
| Eriksen et al. | VDE-SAT–A new maritime communications system | |
| CN110944324A (en) | Integrated network data transmission communication platform based on space encryption technology | |
| CN106788475A (en) | Short wavelength regions emergency mobile communication half-blindness frequency-selective system and its method | |
| CN106959461B (en) | Navigation and deformation monitoring method, monitoring terminal, administrative center and navigation neceiver | |
| Eriksen et al. | VDE-SAT–Preliminary verification results for proposed satellite component of new maritime communication system | |
| Wang et al. | Experimental research on marine digital navigation system | |
| CN206775508U (en) | Marine intermediate frequency digital broadcast system | |
| WO2021131438A1 (en) | Radio wave monitoring device | |
| CN203761386U (en) | Ship-borne satellite broadband communication modem in mode of code division multiple access | |
| Yi et al. | Design of high frequency digital transceiver in coastal radio station and shipborne | |
| CN207010658U (en) | Seashore Nifutis information distributing monitoring system | |
| CN111641432A (en) | High-frequency circuit digitalization system for coastal radio station | |
| Guojun et al. | A Novel Skywave Over-the-Horizon Transmission Scheme for Remote Island Reef Environment Monitoring Based on Wide-area Collaborative Reception |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180629 |
|
| RJ01 | Rejection of invention patent application after publication |