CN106209129B - A kind of dedicated ultrashort wave Data transfer system and method for ocean fisheries administration communication - Google Patents
A kind of dedicated ultrashort wave Data transfer system and method for ocean fisheries administration communication Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention discloses the dedicated ultrashort wave Data transfer systems and method of a kind of communication of ocean fisheries administration, comprising: modulation /demodulation module: Direct Digital Synthesizer, Complex Programmable Logic Devices, single-chip microcontroller, 27.5M-39.5M band logical, radio frequency power amplifier, Gao Fang, first order mixing, 10.7M intermediate frequency filtering, second level mixing, 2.88M low-pass filtering, limiting amplifier, 250K analogue low pass filtering, clipping and relay；Application processing module: ARM embedded system, audio frequency power amplifier, outside speaker, MCI microphone, external expansion interface, SD card, 1Gb Nand Flash, 8Mbyte SPI Flash, keyboard, VGA display, supply voltage monitoring, camera, GPS, network card chip and network interface, temperature sensor and antenna open circuit monitoring.Present invention reduces system hardware complexity, improve system stability and the availability of frequency spectrum.
Description
Technical field
The invention belongs to the dedicated ultrashort wave numbers that radio communication technology field more particularly to a kind of ocean fisheries administration communicate to pass
System and method.
Background technique
Fish-farming operation radio communication is the unique channel write to each other between fisheries administration ship and land organ, ship and ship.Mesh
Most of fisheries administration ship in preceding China is equipped with the quantity communication navigation set more advanced compared with complete, performance, at sea enforcing law
In play the role of it is good.But there are still short slabs in the data communication of Hai Yulu, ship and ship.Existing satellite broadband communication
Rate is very fast but expensive, and use cost is too high；Existing 2.4G communication equipment, traffic rate are able to satisfy requirement, but distance
It is too close；The public mobile communications such as existing coastal CDMA can only also cover the inshore region in 15 nautical miles；It is existing remote
The high-speed digital transmission radio station of 100kbps or more, the communications band used are not able to satisfy sea fishery communication in 150MHz or more
The requirement of 27.5MHz-39.5MHz frequency range；Existing 27.5MHz-39.5MHz sea fishery communication system, is unable to satisfy fishing
The quick transmitting of the data informations such as image, photo, file, table in political affairs ship enforcing law between land and motor boat.
Existing 27.5MHz-39.5MHz fishery is modulated and is demodulated using FM and GMSK two ways with radio station system.
The modulation of GMSK directly adjusts mode to realize using simulation VCO, the demodulation of GMSK, and using FM demodulation mode cooperation FPGA's
What synchronization process was realized.There are problems that low-pass modulation dropout since FM is directly adjusted, which is compiled by Manchester channel
Code avoids the problem, and the information rate provided is 4.8Kbps, and air information rate is 9.6Kbps, busy channel bandwidth
12.5KHz。
Summary of the invention
The purpose of the present invention is to provide the dedicated ultrashort wave Data transfer systems and method of a kind of communication of ocean fisheries administration, it is intended to solve
Certainly in the dedicated frequency range of fish-farming operation, communications system transmission rate between ship and land, ship and ship, ship and ship is low, transmission range is close, no
The problem of image can be transmitted.
The invention is realized in this way a kind of dedicated ultrashort wave number transmission method of the ocean fisheries administration communication, the ocean
Fish-farming operation communication dedicated ultrashort wave number transmission method the following steps are included:
When information emits, application processing module by the information of wireless receiving and dispatching, connects voice, video, text by RS232
Mouthful, with 256000bps rate, single-chip microcontroller is sent to by every 200 bytes, one frame mode；After single-chip microcontroller receives a frame data, In
Frame head adds synchronous head and postamble adds CRC check data, forms new frame, and obtain by the first low and then high sequence of every byte
The Bit String for needing to modulate, Bit String are the data a for needing to carry out GMSK modulationn；
The GMSK modulation signal of Direct Digital Synthesizer output, is sent to 27.5M-39.5M by the line on PCB
Band logical module, filters out band stray；The output signal of 27.5M-39.5M band logical module is sent to high frequency function by the line on PCB
It puts, amplified signal power；After the defeated signal of radio frequency power amplifier passes through relay, then by real by antenna after 27.5M-39.5M band logical
Existing wireless transmission；
When information receives, after wireless signal is by 27.5M-39.5M band logical and relay, connected by PCB line supreme
It puts, realizes low level signal amplification；Height put after signal, first order frequency mixing module is connected to by the line on PCB, with directly number
The local oscillation signal that word formula frequency synthesizer transmits is multiplied, and realizes mixing to select to receive frequency；Letter after mixing
Number, 10.7M intermediate frequency filtering is connected to by the line on PCB, obtains the received IF signal of 10.7MHz；10.7M intermediate frequency filtering
Signal afterwards is connected to second level frequency mixing module by the line on PCB, passes through the 13.58MHz's with second level frequency mixing module
After local oscillator is multiplied, then by after 2.88MHz low-pass filter, obtaining the low intermediate frequency signal of 2.88MHz, then by limited range enlargement it
Afterwards, the signal for obtaining Transistor-Transistor Logic level, by the direct high speed acquisition of Complex Programmable Logic Devices；
Signal after high speed acquisition realizes the exclusive or behaviour of the sampled point of interval 2bit inside Complex Programmable Logic Devices
Make, realizes 2bit calculus of differences；Signal after 2bit calculus of differences is exported by the pin of Complex Programmable Logic Devices, and
After external 250kHz simulation low-pass filter and clipping module, it is same that Complex Programmable Logic Devices progress position is given again
Step and frame decoding processing；Data that treated give single-chip microcontroller by EMIF, and by single-chip microcontroller frame decoding, single-chip microcontroller will be after frame decoding
Data give ARM embedded system by the RS232 interface of 256000bps, by ARM embedded system, according to information category
Difference do different processing, specifically: if it is voice data stream, then audio is played by audio port, and eventually by outer
Loudspeaker are put to play back；If it is text information, pictorial information, video information, then after being stored in SD card or Flash, In
It is shown when human-computer interaction needs by VGA display.
Further, described by anRealize that the calculating process of GMSK modulation is as follows:
The expression formula of GMSK signal are as follows:
In formula
wcIt is the modulating frequency of GMSK, TbIt is element duration, n is n-th of symbol currently entered, and g (t) is Men Han
Number,For the phase modulation of GMSK modulation signal；
When realizing GMSK modulation, key algorithm is to phaseCalculating, can be calculated by (3-1) and (3-2) formula:
Wherein
WhenWhen being indicated with discretization, it can be calculated with formula (4-1), (4-2), (4-3), (4-4) and (4-5):
It enables
Then
Sampling rate is Ts, then calculatingWhen, t=nTb+mTs,
Single-chip microcontroller a according to the input datan, the initial address of the phase meter of current bit is calculated, it can passing through complexity
Programmed logic device informs that AD9954 exports this phase meter, realizes the modulation of GMSK.
Another object of the present invention is to provide a kind of seas of the dedicated ultrashort wave number transmission method of ocean fisheries administration communication
The dedicated ultrashort wave Data transfer system of foreign fish-farming operation communication, the dedicated ultrashort wave Data transfer system that the ocean fisheries administration communicates include:
Modulation /demodulation module, for passing with the wireless mode of GMSK modulation and another ultrashort wave number application message and being
System interacts；
Application processing module for realizing outputting and inputting for human-machine interaction data, and passes through RS232 interface and modulatedemodulate
Human-machine interaction data is transferred to modulation /demodulation module by the connection of mode transfer block, or is wirelessly transferred from the acquisition of modulation /demodulation module
The data come.
Further, the modulation /demodulation module include: Direct Digital Synthesizer, Complex Programmable Logic Devices,
Single-chip microcontroller, 27.5M-39.5M band logical, radio frequency power amplifier, Gao Fang, first order mixing, 10.7M intermediate frequency filtering, the second level mixing,
2.88M low-pass filtering, limiting amplifier, 250K analogue low pass filtering, clipping and relay；
The sheet that the Direct Digital Synthesizer is mixed for realizing the GMSK modulation signal and the first order of transmitting
Vibration, the control word of frequency and phase give Complex Programmable Logic Devices by EMIF interface by single-chip microcontroller, then can by complexity
Programmed logic device is sent by GPIO and SPI interface；The Complex Programmable Logic Devices, passes through EMIF, SPI and GPIO
Interface is connected with single-chip microcontroller, receives the data that single-chip microcontroller transmits, and be converted to the frequency of Direct Digital Synthesizer
Word and phase word are sent into Direct Digital Synthesizer by GPIO and SPI interface；The single-chip microcontroller passes through RS232 interface
It is connected to ARM embedded system, is obtained and is needed the information modulated or the information after demodulation is sent to ARM embedded system,
The single-chip microcontroller is connected by EMIF, SPI and GPIO interface with Complex Programmable Logic Devices, and is controlled and received and dispatched by GPIO
The switching of relay；The modulated signal of Direct Digital Synthesizer output, is sent to 27.5M- by the line on PCB
39.5M band logical module, to filter out band stray；The output signal of 27.5M-39.5M band logical module is sent to by the line on PCB
Radio frequency power amplifier, with amplified signal power；After the defeated signal of radio frequency power amplifier passes through relay, then by being passed through after 27.5M-39.5M band logical
It crosses antenna and realizes wireless transmission；After the wireless signal is by 27.5M-39.5M band logical and relay, connected by PCB line
It is supreme to put, to realize low level signal amplification；Height put after signal, first order frequency mixing module is connected to by the line on PCB, with
The local oscillation signal that Direct Digital Synthesizer transmits is multiplied, and realizes mixing to select to receive frequency；Mixing
Signal afterwards is connected to 10.7M intermediate frequency filtering by the line on PCB, obtains the received IF signal of 10.7MHz；In 10.7M
Frequently filtered signal is connected to second level frequency mixing module by the line on PCB, by with second level frequency mixing module
After the local oscillator of 13.58MHz is multiplied, then by obtaining the low intermediate frequency signal of 2.88MHz, then pass through after 2.88MHz low-pass filter
After limited range enlargement, the signal of Transistor-Transistor Logic level is obtained, by the direct high speed acquisition of Complex Programmable Logic Devices；After high speed acquisition
Signal realizes the xor operation of the sampled point of interval 2bit inside Complex Programmable Logic Devices, realizes 2bit calculus of differences；
Signal after 2bit calculus of differences is exported by the pin of Complex Programmable Logic Devices, and the 250kHz simulation outside
After low-pass filter and clipping module, Complex Programmable Logic Devices is given again and carries out bit synchronization and frame decoding processing.
Further, the application processing module include: ARM embedded system, audio frequency power amplifier, outside speaker, MCI microphone,
External expansion interface, SD card, 1Gb Nand Flash, 8Mbyte SPI Flash, keyboard, VGA display, supply voltage prison
Survey, camera, GPS, network card chip and network interface, temperature sensor and antenna open circuit monitoring；
The external expansion interface, camera, keyboard are connect by USB interface with ARM embedded system；ARM is embedded
The output audio of system is connected to the audio frequency power amplifier by PCB line, by Audio power amplifier, and passes through PCB line again
It is connected to the broadcasting that the outside speaker realizes sound；ARM embedded system by SPI interface be connected to the SD card and
The SPI Flash of 8Mbyte realizes the storage of large capacity information；The VGA display is connected to ARM insertion by USB interface
Formula system；The supply voltage monitoring, temperature sensor and antenna open circuit monitoring are connected to the embedded system of ARM by PCB line
The AD of system samples pin；Required network card chip is connected to arm processor by the network-specific bus of ARM embedded system；Institute
It states network interface and is connected to network card chip by differential lines on PCB；
The ARM embedded system, for being responsible for the human-computer interaction of processing voice, video, text information various information, with
And power management and antenna open circuit detect.
Another object of the present invention is to provide a kind of dedicated ultrashort wave number transmission methods communicated using the ocean fisheries administration
Fish-farming operation radio communications system.
The dedicated ultrashort wave Data transfer system and method for ocean fisheries administration communication provided by the invention, can be ultrashort in fishery number
In the coverage area of wave bank station (0-50 is in the sea), during completing fishery mangement and enforcement of the law, between ship and land, ship and ship, ship and ship quickly
The data of rate are transmitted, and transmit the data informations such as image, photo, file, the table in enforcing law in real time, are that fisheries administration ship is satisfactory
Completion enforcement effort provide a quick, accurate data information platform.The present invention uses the number based on DDS+CPLD+MCU
Word modulation demodulation system, relatively existing 27.5MHz-39.5MHz fishing transceiver do not need to do graceful Chester volume in transmitting
Code, the frequency spectrum being doubled, while avoiding simulation VCO bring hardware complexity and simulation FM formula demodulation bring system
The unstability for performance of uniting.The system proposed occupies the 500KHz frequency spectrum in the dedicated frequency range of 27.5MHz-39.5MHz fish-farming operation,
The high speed information rate of 200Kbps is provided, by the transmission power of 50W, provides the coverage area of 0-50 in the sea.
The present invention realizes the information rate for being up to 200Kbps in 27.5MHz-29.5MHz frequency range；Using MCU+CPLD+
DDS realizes digital GMSK modulation and demodulation；Radio receiving transmitting module is connected with application processing module by RS232 interface, just
In system compact and modularization, be conducive to improve system stability.The legal solution ship of the present invention and land, ship and ship, ship with
Remote high-speed data communication problem between ship, to realize the number such as image, photo, file, table during fishery mangement and enforcement of the law
It is believed that the transmitting of breath, and a quick, accurate data information platform is provided for the satisfactory completion enforcement effort of fisheries administration ship.
Detailed description of the invention
Fig. 1 is the dedicated ultrashort wave Data transfer system structural schematic diagram of ocean fisheries administration communication provided in an embodiment of the present invention；
In figure: 1, modulation /demodulation module；2, application processing module.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the dedicated ultrashort wave Data transfer system that the ocean fisheries administration of the embodiment of the present invention communicates includes: modulation /demodulation
Module 1 and application processing module 2.
Modulation /demodulation module 1, for passing with the wireless mode of GMSK modulation and another ultrashort wave number application message and being
System interacts.
Application processing module 2 for realizing outputting and inputting for human-machine interaction data, and passes through RS232 interface and modulation
Human-machine interaction data is transferred to modulation /demodulation module by demodulation module connection, or is obtained and be wirelessly transferred from modulation /demodulation module
The data to come over.
Modulation /demodulation module 1 further comprises: Direct Digital Synthesizer, Complex Programmable Logic Devices, monolithic
Machine, 27.5M-39.5M band logical, radio frequency power amplifier, Gao Fang, first order mixing, 10.7M intermediate frequency filtering, second level mixing, 2.88M are low
Pass filter, limiting amplifier, 250K analogue low pass filtering, clipping and relay.
The sheet that the Direct Digital Synthesizer is mixed for realizing the GMSK modulation signal and the first order of transmitting
Vibration, the control word of frequency and phase give Complex Programmable Logic Devices by EMIF interface by single-chip microcontroller, then can by complexity
Programmed logic device is sent by GPIO and SPI interface；The Complex Programmable Logic Devices, passes through EMIF, SPI and GPIO
Interface is connected with single-chip microcontroller, receives the data that single-chip microcontroller transmits, and be converted to the frequency of Direct Digital Synthesizer
Word and phase word are sent into Direct Digital Synthesizer by GPIO and SPI interface；The single-chip microcontroller passes through RS232 interface
It is connected to ARM embedded system, is obtained and is needed the information modulated or the information after demodulation is sent to ARM embedded system,
The single-chip microcontroller is connected by EMIF, SPI and GPIO interface with Complex Programmable Logic Devices, and is controlled and received and dispatched by GPIO
The switching of relay；The modulated signal of Direct Digital Synthesizer output, is sent to 27.5M- by the line on PCB
39.5M band logical module, to filter out band stray；The output signal of 27.5M-39.5M band logical module is sent to by the line on PCB
Radio frequency power amplifier, with amplified signal power；After the defeated signal of radio frequency power amplifier passes through relay, then by being passed through after 27.5M-39.5M band logical
It crosses antenna and realizes wireless transmission；After the wireless signal is by 27.5M-39.5M band logical and relay, connected by PCB line
It is supreme to put, to realize low level signal amplification；Height put after signal, first order frequency mixing module is connected to by the line on PCB, with
The local oscillation signal that Direct Digital Synthesizer transmits is multiplied, and realizes mixing to select to receive frequency；Mixing
Signal afterwards is connected to 10.7M intermediate frequency filtering by the line on PCB, obtains the received IF signal of 10.7MHz；In 10.7M
Frequently filtered signal is connected to second level frequency mixing module by the line on PCB, by with second level frequency mixing module
After the local oscillator of 13.58MHz is multiplied, then by obtaining the low intermediate frequency signal of 2.88MHz, then pass through after 2.88MHz low-pass filter
After limited range enlargement, the signal of Transistor-Transistor Logic level is obtained, by the direct high speed acquisition of Complex Programmable Logic Devices；After high speed acquisition
Signal realizes the xor operation of the sampled point of interval 2bit inside Complex Programmable Logic Devices, realizes 2bit calculus of differences；
Signal after 2bit calculus of differences is exported by the pin of Complex Programmable Logic Devices, and the 250kHz simulation outside
After low-pass filter and clipping module, Complex Programmable Logic Devices is given again and carries out bit synchronization and frame decoding processing.
Application processing module 2 further comprises: ARM embedded system, outside speaker, MCI microphone, external expansion interface,
SD card, 1Gb Nand Flash, 8Mbyte SPI Flash, keyboard, VGA display, supply voltage monitoring, camera, GPS,
Network card chip and network interface, temperature sensor and antenna open circuit monitoring.
The external expansion interface, camera, keyboard are connect by USB interface with ARM embedded system；ARM is embedded
The output audio of system is connected to the audio frequency power amplifier by PCB line, by Audio power amplifier, and passes through PCB line again
It is connected to the broadcasting that the outside speaker realizes sound；ARM embedded system by SPI interface be connected to the SD card and
The SPI Flash of 8Mbyte realizes the storage of large capacity information；The VGA display is connected to ARM insertion by USB interface
Formula system；The supply voltage monitoring, temperature sensor and antenna open circuit monitoring are connected to the embedded system of ARM by PCB line
The AD of system samples pin；Required network card chip is connected to arm processor by the network-specific bus of ARM embedded system；Institute
It states network interface and is connected to network card chip by differential lines on PCB.ARM embedded system, for be responsible for processing voice, video,
The tasks such as the human-computer interaction of the various informations such as text information and the open circuit detection of power management and antenna.
Below with reference to the signal processing pair of the dedicated ultrashort wave Data transfer system of ocean fisheries administration of embodiment of the present invention communication
Application principle of the invention is further described.
When information emits, application processing module by the information of wireless receiving and dispatching, connects voice, video, text by RS232
Mouthful, with 256000bps rate, single-chip microcontroller is sent to by every 200 bytes, one frame mode；After single-chip microcontroller receives a frame data, In
The frame head adds synchronous head and postamble adds CRC check data, forms a new frame, and first low and then high by every byte
Sequence obtains the Bit String for needing to modulate, which is the data a for needing to carry out GMSK modulationn.By anRealize GMSK
The calculating process of modulation is as follows:
The expression formula of GMSK signal are as follows:
In formula
Here, wcIt is the modulating frequency of GMSK, TbIt is element duration, n is n-th of symbol currently entered, and g (t) is
Gate function,For the phase modulation of GMSK modulation signal.
When realizing GMSK modulation using the program, key algorithm is to phaseCalculating, can be by (3-1) and (3-2)
Formula calculates:
Wherein
WhenWhen being indicated with discretization, it can be calculated with formula (4-1), (4-2), (4-3), (4-4) and (4-5):
It enables
Then
If the sampling rate of Complex Programmable Logic Devices is Ts, then calculatingWhen, t=nTb+mTs,It can obtain
By analyzing above it is found that according to different input data an, share 8 kinds of different phase meters, every kind of phase meter table
Show the change procedure of the carrier phase of 1 bit GMSK signal of current modulation.In actual use, it 8 kinds of phase meters can then will calculate
Out, it is stored in order in the internal RAM of Direct Digital Frequency Synthesizers AD9954 chip.Single-chip microcontroller is according to the input data
an, the initial address of the phase meter of current bit is calculated, is informing that AD9954 exports this by Complex Programmable Logic Devices
The modulation of GMSK can be realized in phase meter.
The GMSK modulation signal of Direct Digital Synthesizer output, is sent to 27.5M-39.5M by the line on PCB
Band logical module, to filter out band stray；The output signal of 27.5M-39.5M band logical module is sent to high frequency by the line on PCB
Power amplifier, with amplified signal power；After the defeated signal of radio frequency power amplifier passes through relay, then by after 27.5M-39.5M band logical by day
Line realizes wireless transmission；
When information receives, after wireless signal is by 27.5M-39.5M band logical and relay, connected by PCB line supreme
It puts, to realize low level signal amplification；Height put after signal, first order frequency mixing module is connected to by the line on PCB, and it is direct
The local oscillation signal that digital frequency synthesizer transmits is multiplied, and realizes mixing to select to receive frequency；After mixing
Signal is connected to 10.7M intermediate frequency filtering by the line on PCB, obtains the received IF signal of 10.7MHz；10.7M intermediate frequency is filtered
Signal after wave is connected to second level frequency mixing module by the line on PCB, passes through the 13.58MHz with second level frequency mixing module
Local oscillator be multiplied after, then by obtaining the low intermediate frequency signal of 2.88MHz, then pass through limited range enlargement after 2.88MHz low-pass filter
Later, the signal for obtaining Transistor-Transistor Logic level, by the direct high speed acquisition of Complex Programmable Logic Devices；Signal after high speed acquisition, multiple
The xor operation that the sampled point of interval 2bit is realized inside miscellaneous programmable logic device, realizes 2bit calculus of differences；2bit difference
Signal after operation is exported by the pin of Complex Programmable Logic Devices, and the 250kHz analogue low pass filtering outside
After device and clipping module, Complex Programmable Logic Devices is given again and carries out bit synchronization and frame decoding processing.Data that treated are logical
It crosses EMIF and gives single-chip microcontroller, and by single-chip microcontroller frame decoding, single-chip microcontroller connects the data after frame decoding by the RS232 of 256000bps
Mouthful, ARM embedded system is given, by ARM embedded system, different processing is done according to the difference of information category, specifically: such as
Fruit is voice data stream, then plays audio by audio port, and play back eventually by outside speaker；If it is text envelope
Breath, pictorial information, video information etc. are shown when human-computer interaction is needed by VGA then after being stored in SD card or Flash
Device is shown.
The power maximum of present system radio frequency power amplifier can cover the range of 0-50 in the sea up to 50W；Can with MFSK,
The modulation systems such as QPSK, MSK, FM, instead of the GMSK modulation of this system；This is replaced using field programmable gate array (FPGA)
The CPLD of system；The single-chip microcontroller (MCU) of this system is replaced using Digital Signal Processing (DSP) or ARM.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of dedicated ultrashort wave number transmission method of ocean fisheries administration communication, which is characterized in that the ocean fisheries administration communicates dedicated
Ultrashort wave number transmission method the following steps are included:
When information emits, application processing module presses voice, video, text every by RS232 interface with 256000bps rate
200 one frame modes of byte are sent to single-chip microcontroller；After single-chip microcontroller receives a frame data, synchronous head and postamble addition are added in frame head
CRC check data form new frame, and obtain the Bit String for needing to modulate, Bit String by the first low and then high sequence of every byte
As need to carry out the data a of GMSK modulationn；Direct Digital Synthesizer for realizing transmitting GMSK modulation signal with
And the local oscillator of first order mixing, the control word of frequency and phase are given complex programmable by EMIF interface by single-chip microcontroller and are patrolled
Collect device；
The GMSK modulation signal of Direct Digital Synthesizer output, is sent to 27.5M-39.5M band logical by the line on PCB
Module filters out band stray；The output signal of 27.5M-39.5M band logical module is sent to radio frequency power amplifier by the line on PCB, puts
Big signal power；After the defeated signal of radio frequency power amplifier passes through relay, then it is wireless by being realized after 27.5M-39.5M band logical by antenna
Transmitting；
When information receives, after wireless signal is by 27.5M-39.5M band logical and relay, put by the connection of PCB line is supreme, it is real
Existing low level signal amplification；Height put after signal, first order frequency mixing module is connected to by the line on PCB, with Direct Digital
The local oscillation signal that frequency synthesizer transmits is multiplied, and realizes mixing to select to receive frequency；Signal after mixing leads to
The line crossed on PCB is connected to 10.7M intermediate frequency filtering, obtains the received IF signal of 10.7MHz；After 10.7M intermediate frequency filtering
Signal is connected to second level frequency mixing module by the line on PCB, passes through the local oscillator of the 13.58MHz with second level frequency mixing module
After multiplication, then by after 2.88MHz low-pass filter, obtaining the low intermediate frequency signal of 2.88MHz, then by after limited range enlargement,
The signal of Transistor-Transistor Logic level is obtained, by the direct high speed acquisition of Complex Programmable Logic Devices；
Signal after high speed acquisition realizes the xor operation of the sampled point of interval 2bit inside Complex Programmable Logic Devices,
Realize 2bit calculus of differences；Signal after 2bit calculus of differences is exported by the pin of Complex Programmable Logic Devices, and is passed through
After crossing external 250kHz simulation low-pass filter and clipping module, Complex Programmable Logic Devices is given again and carries out bit synchronization
And frame decoding processing；Data that treated give single-chip microcontroller by EMIF, and by single-chip microcontroller frame decoding, and single-chip microcontroller is by the number after frame decoding
According to by the RS232 interface of 256000bps, ARM embedded system being given, by ARM embedded system, according to information category
Difference does different processing, specifically: if it is voice data stream, then audio is played by audio port, and eventually by putting outside
Loudspeaker play back；If it is text information, pictorial information or video information, then after being stored in SD card or Flash, in people
Machine interaction is shown when needing by VGA display.
2. the dedicated ultrashort wave number transmission method of ocean fisheries administration communication as described in claim 1, which is characterized in that by anIt realizes
The calculating process of GMSK modulation is as follows:
The expression formula of GMSK signal are as follows:
In formula
wcIt is the modulating frequency of GMSK, TbIt is element duration, anFor n-th of symbol currently entered, gTIt (t) is gate function,For the phase modulation of GMSK modulation signal；
When realizing GMSK modulation, key algorithm is to phaseCalculating, can be calculated by formula (3-1) and (3-2):
Wherein
WhenWhen being indicated with discretization, it can be calculated with formula (4-1), (4-2), (4-3), (4-4) and (4-5):
It enables
Then
Sampling rate is Ts, then calculatingWhen, t=nTb+mTs, m=0,1,2,3...l-1,
Single-chip microcontroller a according to the input datan, the initial address of the phase meter of current bit is calculated, then patrol by complex programmable
It collects device and informs that AD9954 exports this phase meter, realize the modulation of GMSK.
3. a kind of ocean fisheries administration communication for the dedicated ultrashort wave number transmission method for realizing the communication of ocean fisheries administration described in claim 1 is special
With ultrashort wave Data transfer system, which is characterized in that the dedicated ultrashort wave Data transfer system of ocean fisheries administration communication includes:
Modulation /demodulation module, for by application message, with the wireless mode of GMSK modulation and another ultrashort wave Data transfer system into
Row interaction；
Application processing module for realizing outputting and inputting for human-machine interaction data, and passes through RS232 interface and modulatedemodulate mode transfer
Human-machine interaction data is transferred to modulation /demodulation module by block connection, or obtains what wireless transmission came from modulation /demodulation module
Data.
4. the dedicated ultrashort wave Data transfer system of ocean fisheries administration communication as claimed in claim 3, which is characterized in that the modulatedemodulate
Mode transfer block includes: Direct Digital Synthesizer, Complex Programmable Logic Devices, single-chip microcontroller, 27.5M-39.5M band logical, height
Frequency power amplifier, Gao Fang, first order mixing, 10.7M intermediate frequency filtering, second level mixing, 2.88M low-pass filtering, limiting amplifier, 250K
Analogue low pass filtering, clipping and relay；
The local oscillator that the Direct Digital Synthesizer is mixed for realizing the GMSK modulation signal and the first order of transmitting,
The control word of frequency and phase gives Complex Programmable Logic Devices by EMIF interface by single-chip microcontroller, then by complex programmable
Logical device is sent by GPIO and SPI interface；The Complex Programmable Logic Devices passes through EMIF, SPI and GPIO interface
Be connected with single-chip microcontroller, receive the data that transmit of single-chip microcontroller, and be converted to Direct Digital Synthesizer frequency word and
Phase word is sent into Direct Digital Synthesizer by GPIO and SPI interface；The single-chip microcontroller is connected by RS232 interface
To ARM embedded system, obtains and need the information modulated or the information after demodulation is sent to ARM embedded system, it is described
Single-chip microcontroller is connected by EMIF, SPI and GPIO interface with Complex Programmable Logic Devices, and controls transmitting-receiving relay by GPIO
The switching of device；The modulated signal of Direct Digital Synthesizer output, is sent to 27.5M-39.5M band by the line on PCB
Logical module, to filter out band stray；The output signal of 27.5M-39.5M band logical module is sent to high frequency function by the line on PCB
It puts, with amplified signal power；After the defeated signal of radio frequency power amplifier passes through relay, then by after 27.5M-39.5M band logical by antenna
Realize wireless transmission；After the wireless signal is by 27.5M-39.5M band logical and relay, put by the connection of PCB line is supreme,
To realize low level signal amplification；Height put after signal, first order frequency mixing module is connected to by the line on PCB, with directly number
The local oscillation signal that word formula frequency synthesizer transmits is multiplied, and realizes mixing to select to receive frequency；Letter after mixing
Number, 10.7M intermediate frequency filtering is connected to by the line on PCB, obtains the received IF signal of 10.7MHz；10.7M intermediate frequency filtering
Signal afterwards is connected to second level frequency mixing module by the line on PCB, passes through the 13.58MHz's with second level frequency mixing module
After local oscillator is multiplied, then by after 2.88MHz low-pass filter, obtaining the low intermediate frequency signal of 2.88MHz, then by limited range enlargement it
Afterwards, the signal for obtaining Transistor-Transistor Logic level, by the direct high speed acquisition of Complex Programmable Logic Devices；Signal after high speed acquisition, in complexity
The xor operation that the sampled point of interval 2bit is realized inside programmable logic device, realizes 2bit calculus of differences；2bit difference fortune
Signal after calculation is exported by the pin of Complex Programmable Logic Devices, and the 250kHz simulation low-pass filter outside
And after clipping module, Complex Programmable Logic Devices is given again and carries out bit synchronization and frame decoding processing.
5. the dedicated ultrashort wave Data transfer system of ocean fisheries administration communication as claimed in claim 3, which is characterized in that at the application
Managing module includes: ARM embedded system, audio frequency power amplifier, outside speaker, MIC microphone, external expansion interface, SD card, 1Gb Nand
Flash, 8Mbyte SPI Flash, keyboard, VGA display, supply voltage monitoring, camera, GPS, network card chip and network
Interface, temperature sensor and antenna open circuit monitoring；
The external expansion interface, camera, keyboard are connect by USB interface with ARM embedded system；ARM embedded system
Output audio, the audio frequency power amplifier is connected to by PCB line, is connected by Audio power amplifier, and again by PCB line
The broadcasting of sound is realized to the outside speaker；ARM embedded system is connected to the SD card and 8Mbyte by SPI interface
SPI Flash realizes the storage of large capacity information；The VGA display is connected to ARM embedded system by USB interface；Institute
Supply voltage monitoring, temperature sensor and the monitoring of antenna open circuit is stated to sample by the AD that PCB line is connected to ARM embedded system
Pin；The network card chip is connected to arm processor by the network-specific bus of ARM embedded system；The network interface
Network card chip is connected to by differential lines on PCB；The MIC microphone is connected to ARM embedded system by USB；The 1Gb
Nand Flash is connected to the parallel bus interface of ARM embedded system by PCB；It is embedding that the GPS by PCB is connected to ARM
The serial ports of embedded system；
The ARM embedded system, for being responsible for the human-computer interaction of processing voice, video, text information various information, Yi Ji electricity
Source control and antenna open circuit detection.
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| CN109617894A (en) * | 2018-12-27 | 2019-04-12 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of sea land communication system |
| CN113571878B (en) * | 2021-09-28 | 2021-12-31 | 中国人民解放军海军工程大学 | Underwater vehicle's sea drags antenna and communication system |
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