CN107040390A - The marine wireless chart update system and method for intermediate frequency - Google Patents
The marine wireless chart update system and method for intermediate frequency Download PDFInfo
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- CN107040390A CN107040390A CN201710402629.2A CN201710402629A CN107040390A CN 107040390 A CN107040390 A CN 107040390A CN 201710402629 A CN201710402629 A CN 201710402629A CN 107040390 A CN107040390 A CN 107040390A
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- 238000001228 spectrum Methods 0.000 claims description 9
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- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1845—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast broadcast or multicast in a specific location, e.g. geocast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- 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]
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Abstract
The invention discloses a kind of marine wireless chart update system and method for intermediate frequency, including broadcast control terminal：All sea charts are broadcast into file distribution to data server, the file for needing to issue is sent to bank base by data server and broadcasts platform；Bank base broadcasts platform：Receive the sea chart from data server and broadcast file, sea chart is broadcast into file is converted into ofdm signal, and is broadcasted by intermediate frequency radio signal to sea chart receiving terminal；Sea chart receiving terminal：By antenna and receiver by the signal received, correct chart update file is reduced to by data processing；It is described broadcast control terminal and broadcast platform with bank base be connected by bank base network, the bank base is broadcast platform and is connected by wireless transmission channel with sea chart receiving terminal.The wireless chart update system and method for marine intermediate frequency that the present invention is provided, can easily transmit sea chart file, and is seamlessly connected with ship information system and equipment, broadcast efficiency high, broad covered area.
Description
Technical field
The present invention relates to a kind of maritime safety information broadcast system and method, more particularly to a kind of wireless sea chart of marine intermediate frequency
Update system and method.
Background technology
In order to ensure navigation safety, it is necessary to timely and effectively from providing relevant 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 about navigation safety.Relevant department is by about the important information of navigation safety on the bank
By NAVTEX coastal stations or INMARSAT, broadcast to the ship in main marine site.
Existing navigational warning and notice to navigator mainly by coastal each coastal station broadcast Morse telegram with
NAVTEX platforms broadcast the issue that NBDP radio teletypes realize information, and both information issue means also have technological means and fallen
Afterwards, ageing to be difficult to ensure, the small shortcoming of coverage rate, ship can not in time, comprehensively and systematically understand the safety letter in navigation marine site
, there is very big hidden danger for navigation safety, the need for being not suitable with advanced information society's demand for development in breath.
Such as traditional marine ships chart update needs CD to post or the mailing of download online dish, spends the time long,
Update cycle is long, it is impossible to timely and effectively more new chart file, and marine ships can not obtain the required sea chart of issue in time
Update file, message is often delayed.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of wireless chart update system and method for marine intermediate frequency, can
Sea chart file is easily transmitted, and is seamlessly connected with ship information system and equipment, efficiency high, broad covered area is broadcast.
The present invention is to provide a kind of wireless sea chart of marine intermediate frequency more to solve the technical scheme that above-mentioned technical problem is used
New system, including broadcast control terminal：All sea charts are broadcast into file distribution to data server, need to by data server
The file to be issued is sent to bank base and broadcasts platform；Bank base broadcasts platform：Receive the sea chart from data server and broadcast file, by sea
Figure broadcasts file and is converted into ofdm signal, and is broadcasted by intermediate frequency radio signal to sea chart receiving terminal；Sea chart receiving terminal：
By antenna and receiver by the signal received, correct chart update file is reduced to by data processing；It is described to broadcast
Hair control terminal is broadcast platform with bank base and is connected by bank base network, and the bank base is broadcast platform and connect by wireless transmission channel and sea chart
Terminal is received to be connected.
Chart update system that above-mentioned marine intermediate frequency is wireless, wherein, it is described broadcast control terminal also by bank base network and
Long-range monitoring receiver is connected, and the long-range monitoring receiver receives intermediate frequency radio signal, and demodulates ofdm signal；Monitoring connects
The quality collected mail number, and report and broadcast control terminal.
Chart update system that above-mentioned marine intermediate frequency is wireless, wherein, the bank base broadcasts platform monitoring and whole to control is broadcast
End, which is reported, broadcasts platform working condition, and the control terminal of broadcasting also includes：Monitoring bank base broadcasts platform working condition, according to long-range prison
The reception data of receiver are surveyed, monitoring bank base broadcasts the quality of broadcasting of platform, and controls bank base to broadcast platform running parameter.
Chart update system that above-mentioned marine intermediate frequency is wireless, wherein, the platform working condition of broadcasting includes transmitting confirmation, accused
Alert, ERP and synchronization report, the platform running parameter of broadcasting are adjusted including transmission power, pilot sub-carrier, subcarrier
Mode processed, Error Correction of Coding mode and transmitting sequence.
Chart update system that above-mentioned marine intermediate frequency is wireless, wherein, the bank base, which broadcasts platform, includes the first controller, described
The clock end connection GNSS receiver or atomic clock of first controller, the input connection monitoring of first controller are received
Machine, the output end of first controller is passed sequentially through to be connected after OFDM modulators, RF makers, RF amplifiers and matching unit
Transmitting antenna, the network-side connection bank base network of first controller.
Chart update system that above-mentioned marine intermediate frequency is wireless, wherein, the sea chart receiving terminal includes second controller, institute
State second controller and Ethernet interface and/or USB interface connected by data/address bus, the input of the second controller and
Ofdm demodulator is connected, and the ofdm demodulator is connected by radio-frequency front-end with medium frequency reception antenna, and the radio-frequency front-end is included
RF wave filters, RF amplifiers and base band output, the RF signals from antenna are filtered, amplified and converted, receives frequency model
Enclose for 495kHz~505kHz.
The present invention also provides a kind of marine intermediate frequency wireless chart update method to solve above-mentioned technical problem, wherein, including
Following steps：S1：All sea charts are broadcast into file by broadcasting control terminal and are published to data server, by data server
The file for needing to issue is sent to bank base and broadcasts platform；S2：Bank base broadcasts sea chart of the platform reception from data server and broadcasts text
Part, broadcasts file by sea chart and is converted into ofdm signal, and broadcasted by intermediate frequency radio signal to sea chart receiving terminal；S3：Sea
Figure receiving terminal, by the signal received, correct chart update text is reduced to by data processing by antenna and receiver
Part.
Chart update method that above-mentioned marine intermediate frequency is wireless, wherein, the sea chart broadcasts the electricity that file uses S-57 forms
Sub- nautical chart；Chart correction information of the control terminal in notices to mariners is broadcast in the step S1 and is fabricated to ENC correction texts
Part, the ENC amendment files include basic data EN and/or update the data ER；The step S3 is sent to electron sea after receiving
Figure shows that carrying out confirmation with information system shows.
Chart update method that above-mentioned marine intermediate frequency is wireless, wherein, bank base broadcasts platform and uses 495- in the step S2
505KHz frequency ranges launch radio signal, and signal modulation process is as follows：Mixing adds DSSS and frequency hopping on OFDM
Spread spectrum, then the signal after capture, tracking and carrier synchronization complete spread spectrum is synchronous, and QAM modulation is carried out to each subcarrier,
Modulation system includes 64-QAM, 16-QAM and 4-QAM.
Chart update method that above-mentioned marine intermediate frequency is wireless, wherein, inserted with pilot signal sequence in the subcarrier, institute
Pilot signal sequence is stated to be distributed using oem character set mode；Sea chart receiving terminal is believed using pilot signal in the step S3
Road estimation obtains the response of whole channel；After frequency domain data is obtained, channel and the reality estimated at pilot frequency locations is first asked for
Least-squares estimation result between channel, then obtains the channel estimation results of data division by LPF interpolation, even
Equilibrium is carried out with the signal to noise ratio estimated using pilot tone, the complete information of frequency domain equalization carries out soft decoding by decoder, then passed through
Remap and return to balanced device, repeat said process until iteration is completed.
Present invention contrast prior art has following beneficial effect：The wireless chart update system of marine intermediate frequency that the present invention is provided
System and method, can easily transmit sea chart file, and are seamlessly connected with ship information system and equipment, broadcast efficiency high, cover
Capping is wide.In addition, the present invention constantly receives the mode of file come in reducing by directly broadcasting on electronic chart correcting information, ship
Between link, reduce crewman's workload, improve chart correction promptness and accuracy.
Brief description of the drawings
Fig. 1 is the wireless chart update system general frame schematic diagram of the marine intermediate frequency of the present invention；
Fig. 2 broadcasts platform circuitry block schematic diagram for the bank base of the wireless chart update system of the marine intermediate frequency of the present invention；
Fig. 3 is the sea chart receiving terminal circuitry block schematic diagram of the wireless chart update system of the marine intermediate frequency of the present invention；
The frequency domain spread spectrum ofdm signal schematic diagram that Fig. 4 uses for the present invention；
Fig. 5 is oem character set pilot cell distribution schematic diagram of the invention；
Fig. 6 is channel estimation schematic diagram of the invention；
Fig. 7 is iterative equalization process schematic flow sheet of the invention.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the wireless chart update system general frame schematic diagram of the marine intermediate frequency of the present invention.
Refer to Fig. 1, the wireless chart update system of marine intermediate frequency that the present invention is provided, including：
Broadcast control terminal：All sea charts are broadcast into file distribution to data server, will be needed by data server
The file of issue is sent to bank base and broadcasts platform；
Bank base broadcasts platform：Receive the sea chart from data server and broadcast file, sea chart is broadcast into file is converted into OFDM
Signal, and broadcasted by intermediate frequency radio signal to sea chart receiving terminal；
Sea chart receiving terminal：By antenna and receiver by the signal received, it is reduced to correctly by data processing
Chart update file；
It is described broadcast control terminal and broadcast platform with bank base be connected by bank base network, the bank base broadcasts platform by wirelessly passing
Defeated channel is connected with sea chart receiving terminal.
The control terminal of broadcasting of the present invention is connected by network with broadcasting platform, can monitor the following state for broadcasting platform：A) send out
Penetrate confirmation；B) alert；C) ERP；D) synchronization report.Control terminal is broadcast also to receive with long-range monitoring by network
Machine is connected, and receives remote receiver data, and what monitoring bank base broadcast platform broadcasts quality.Broadcast the ginseng that control terminal changes emitter
Number, such as：A) transmission power；B) OFDM parameters (pilot sub-carrier, subcarrier modulation modes, Error Correction of Coding mode etc.)；C) launch
Sequence.
The bank base network of the present invention can be by the way of broadband connection, low rate connection or local file be shared.Bank base is broadcast
Send out platform (by access protection home server) composition as shown in Fig. 2 including：A) first controller, to be protected by access
Home server；B) an OFDM modulator；C) the RF makers and amplifier of a 500kHz frequency range；D) subband is matched
The transmitting antenna of unit；E) one is used for the GNSS receiver or atomic clock of synchronization；F) monitoring receiver with antenna.
The first controller that the bank base of the present invention broadcasts platform receives following information：A) message file from SIM；B) come from
The time synchronization information of GNSS receiver or reference clock；C) the 500kHz signals from monitoring receiver；D) modulator is come from
500kHz signals；E) monitoring signals from RF makers and amplifier.
The major function for the first controller that the bank base of the present invention broadcasts platform is as follows：A) check that related frequency range is before transmission
The no free time；B) all signals for bank base being broadcast into platform are synchronous with synchronizing clock signals；C) controlling transmission parameter, time and sequence；
D) message file that need to launch is formatted by packet transmission requirement.
The modulator that the present invention is used needs three kinds of inlet flows：
A) always using 4-QAM subcarrier-modulateds, there is provided following information by modulation intelligence stream (MIS), MIS：1) frequency spectrum takes；
2) modulation system (4-, 16- or 64-QAM) of transmitter information stream (TIS) and data flow (DS).
B) transmitter information stream (TIS), TIS streams can use 4- or 16-QAM subcarrier-modulateds, provide following to receiver
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 emitter；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
Format, modulator is encoded by data stream encoding form to input traffic.
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 with encode and energy dissipation shape
Formula is formatted.OFDM mappers set up OFDM units by unit mapping, include the inlet flow and pilot cell of formatting.
Receiver can assess radio channel and synchronous RF signals using pilot cell.OFDM base band maker is according to the output of mapper
Produce OFDM baseband signals.
RF makers：500kHz RF makers transform to baseband signal in 500kHz outgoing carrier, exciting amplifier
RF signals are amplified to desired power.
RF amplifiers：The 500kHz signals that maker is exported are amplified to necessary power, are covered with the radio needed for meeting
Lid is required.To meet information errors rate (MER) requirement, the crest factor of RF amplifier outs should be controlled in 7dB~10dB.
Transmitting antenna with matching unit：Transmitting antenna should have impedance matching unit, RF amplifiers output matching connection
Unit, is then connected to transmitting antenna.
GNSS receiver and backup atomic clock：The clock is used for synchronous local controller.Monitoring receiver checks related frequency
Whether rate is idle before transmission, and available for inspection RF transmittings.
Continuing with referring to Fig. 3, sea chart receiving terminal of the invention mainly includes following essential part：A) medium frequency reception
Antenna；B) radio-frequency front-end；C) ofdm demodulator；D) second controller；E) display unit；F) data-interface.Each unit it is main
Function and realization are as follows.
First, medium frequency reception antenna
Receives frequency scope covering 495kHz~505kHz electric field or the antenna in magnetic field, preferably cover 486kHz, 490kHz
And 518kHz, so as to NAVTEX common antennas.Numerous studies show, the sea earthwave of intermediate frequency 415kHz~526.5kHz frequency ranges
Transmission field strength attenuation it is slow, propagate stable, weather strong adaptability, with very good overwater propagation characteristic.
2nd, radio-frequency front-end
Radio-frequency front-end includes RF wave filters, RF amplifiers and base band output, and the RF signals from antenna are filtered, put
Big and conversion, is required with meeting demodulation.Possess high sensitivity and HDR.
3rd, ofdm demodulator：Ofdm signal is demodulated, to recover DS, MIS and TIS data flow, re-created
Include the data flow of the message file sent.
This stage implements：A) time/frequency is synchronous；B) channel estimating；C) automatic Modulation recovers；D) error correction.NAVDAT (in
The marine digit broadcasting system of frequency) receiver should be able to the following modulation parameter of automatic detection：A) 16- or 64-QAM；B) subcarrier side
Case；C) mode of Error Correction of Coding.In addition to DS, it is also responsible for reporting the information filled in TIS and MIS.In addition, the receiver is also
Report the following side information about channel：A) SNR estimated；b)BER；c)MER.
4th, second controller
A) win message file from DS (by packet combining into file)；
B) other information that TIS and MIS and demodulator are provided is explained；
C) file demultplexer：1) message file is received；2) ensure to mark the message file (broadcast mode for asking it to note
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 the standards of S 1 of the hydrographic department drafting of government authorization
There are figure, ENC two kinds of forms to be basic data NE and update the data ER.Basic data and update the data aobvious for electronic chart together
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 shows
Show and show and be correspondingly processed with information system ECDIS.Either basic data is still updated the data, with the form of standard
Carry out the tissue of data and encapsulate to reach that the electronic chart that the hydrographic survey mechanism of country variant makes can be different
Used exactly on ECDIS.
The present invention also provides a kind of marine intermediate frequency wireless chart update method, comprises the following steps：
S1：All sea charts are broadcast into file by broadcasting control terminal and are published to data server, by data server
The file for needing to issue is sent to bank base and broadcasts platform；
S2：Bank base broadcasts sea chart of the platform reception from data server and broadcasts file, and sea chart is broadcast into file is converted into
Ofdm signal, and broadcasted by intermediate frequency radio signal to sea chart receiving terminal；
S3：Sea chart receiving terminal, by the signal received, is reduced to just by antenna and receiver by data processing
True chart update file.
The present invention can easily with the ECDIS (ECS) and electronic Chart Display on ship equipment 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
Connected 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, strengthens ship
The automatization level of oceangoing ship information processing.
The wireless chart update method of marine intermediate frequency that the present invention is provided, the bank base broadcasts platform using 495-505KHz frequency ranges
Launch radio signal.Because there is serious weak and interference in medium wave channel, it is therefore desirable to a kind of anti-interference, highly sensitive
Simultaneous techniques ensures the detection of signal.In order to resist the decline of signal channel, make each subcarrier have one it is complete
Kind demodulation, the response of the radio transmission channel of each subcarrier need to be estimated when receiving, and uses balanced measure.
Continuing with referring to Fig. 4, signal modulation process of the present invention is as follows：Mixing adds DSSS and jump on OFDM
Frequency is spread, and then the signal after capture, tracking and carrier synchronization complete spread spectrum is synchronous, and QAM tune is carried out to each subcarrier
System, modulation system includes 64-QAM, 16-QAM and 4-QAM.Due to OFDM multi-carrier nature 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
Subcarrier is produced by ionosphere by absorption due to place Frequency point in interference, including the interference of single-tone, arrowband and frequency band
Decay etc., so that it is guaranteed that medium wave signal low signal-to-noise ratio, exist can also realize under interference and disturbed conditions it is quick and precisely synchronous.
It is described inserted with pilot signal sequence in the wireless chart update method of marine intermediate frequency of the present invention, 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 has following functions：
A) detect whether to receive signal；
B) frequency deviation is estimated；
C) radio transmission channel is estimated.
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, provide synchronous for receiver.
The estimation of the available data rate of the present invention is as follows：In 495kHz~505kHz transmission channel bandwidth, 16-
The typical original data rate of the data flow (DS) of QAM modulation is in 25kbps or so.For adjustment channel guard level, data are carried
Number of subcarriers can be changed.The channel guard (to anti-multipath, decay, delay etc.) of higher level can reduce useful subcarrier
Quantity.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 exists
When between 0.5~0.75, effective data rate is between 12kbps~18kbps.Higher code check can provide higher effective
Data transfer rate, but can correspondingly reduce radio coverage.
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
Score 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 is preferred to use least square method and estimated, (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 whole 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 division is then obtained by LPF interpolation
Channel estimation results, equilibrium is carried out together with the signal to noise ratio estimated using pilot tone, and the complete information of frequency domain equalization is carried out by decoder
Soft decoding, then returns to balanced device, such iteration by remapping.It is wherein balanced for the first time, due to not decoded now
Soft Inform ation afterwards, therefore balanced equivalent to one time MMSE equilibrium for the first time, each equilibrium afterwards are 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, so it is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when a little modification can be made and perfect, therefore the protection model of the present invention
Enclose when by being defined that claims are defined.
Claims (10)
1. a kind of wireless chart update system of marine intermediate frequency, it is characterised in that including：
Broadcast control terminal：All sea charts are broadcast into file distribution to data server, issue will be needed by data server
File be sent to bank base and broadcast platform；
Bank base broadcasts platform：Receive the sea chart from data server and broadcast file, sea chart is broadcast into file is converted into ofdm signal,
And broadcasted by intermediate frequency radio signal to sea chart receiving terminal；
Sea chart receiving terminal：By antenna and receiver by the signal received, correct sea is reduced to by data processing
Scheme more new file；
It is described broadcast control terminal and broadcast platform with bank base be connected by bank base network, the bank base broadcasts platform by being wirelessly transferred letter
Road is connected with sea chart receiving terminal.
2. the wireless chart update system of sea intermediate frequency as claimed in claim 1, it is characterised in that described to broadcast control terminal also
It is connected by bank base network with long-range monitoring receiver, the long-range monitoring receiver receives intermediate frequency radio signal, and demodulates
Ofdm signal；Monitoring receives the quality of signal, and reports and broadcast control terminal.
3. the wireless chart update system of sea intermediate frequency as claimed in claim 2, it is characterised in that the bank base broadcasts platform monitoring
And platform working condition is broadcast to broadcasting control terminal and reporting, the control terminal of broadcasting also includes：Monitoring bank base broadcasts platform work
State, according to the reception data of long-range monitoring receiver, monitoring bank base broadcasts the quality of broadcasting of platform, and controls bank base to broadcast platform work
Make parameter.
4. the wireless chart update system of sea intermediate frequency as claimed in claim 3, it is characterised in that described to broadcast platform working condition
Including transmitting confirmation, alarm, ERP and synchronization report, the platform running parameter of broadcasting includes transmission power, pilot tone
Subcarrier, subcarrier modulation modes, Error Correction of Coding mode and transmitting sequence.
5. the wireless chart update system of sea intermediate frequency as claimed in claim 1, it is characterised in that the bank base, which broadcasts platform, to be included
First controller, the clock end connection GNSS receiver or atomic clock of first controller, the input of first controller
End connection monitoring receiver, the output end of first controller pass sequentially through OFDM modulators, RF makers, RF amplifiers and
Transmitting antenna, the network-side connection bank base network of first controller are connected after matching unit.
6. the wireless chart update system of sea intermediate frequency as claimed in claim 1, it is characterised in that the sea chart receiving terminal bag
Second controller is included, the second controller connects Ethernet interface and/or USB interface, second control by data/address bus
The input of device processed is connected with ofdm demodulator, and the ofdm demodulator is connected by radio-frequency front-end with medium frequency reception antenna, institute
State radio-frequency front-end and include RF wave filters, RF amplifiers and base band output, the RF signals from antenna are filtered, amplified and become
Change, receives frequency scope is 495kHz~505kHz.
7. a kind of wireless chart update method of marine intermediate frequency, it is characterised in that comprise the following steps：
S1：All sea charts are broadcast into file by broadcasting control terminal and are published to data server, need to by data server
The file to be issued is sent to bank base and broadcasts platform；
S2：Bank base broadcasts sea chart of the platform reception from data server and broadcasts file, and sea chart is broadcast into file is converted into OFDM letters
Number, and broadcasted by intermediate frequency radio signal to sea chart receiving terminal；
S3：Sea chart receiving terminal, by the signal received, is reduced to correctly by antenna and receiver by data processing
Chart update file.
8. the wireless chart update method of sea intermediate frequency as claimed in claim 7, it is characterised in that the sea chart is broadcast file and adopted
With the electronic nautical chart of S-57 forms；Chart correction information system of the control terminal in notices to mariners is broadcast in the step S1
ENC amendment files are made, the ENC amendment files include basic data EN and/or update the data ER；After the step S3 is received
Send to electronic chart display and infor mation system progress confirmation and show.
9. the wireless chart update method of sea intermediate frequency as claimed in claim 7, it is characterised in that bank base is broadcast in the step S2
Send out platform and radio signal is launched using 495-505KHz frequency ranges, signal modulation process is as follows：Mixing adds direct sequence on OFDM
Row spread spectrum and FHSS, then the signal after capture, tracking and carrier synchronization complete spread spectrum is synchronous, to each subcarrier
QAM modulation is carried out, modulation system includes 64-QAM, 16-QAM and 4-QAM.
10. the wireless chart update method of sea intermediate frequency as claimed in claim 9, it is characterised in that inserted in the subcarrier
There is pilot signal sequence, the pilot signal sequence is distributed using oem character set mode；Sea chart receiving terminal in the step S3
The response that channel estimation obtains whole channel is carried out using pilot signal；After frequency domain data is obtained, first ask at pilot frequency locations
Least-squares estimation result between the channel and actual channel that estimate, then obtains data division by LPF interpolation
Channel estimation results, carried out together with the signal to noise ratio estimated using pilot tone balanced, the complete information of frequency domain equalization is entered by decoder
Row soft decoding, then returns to balanced device by remapping, and repeats said process until iteration is completed.
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