CN204967830U - Carrier frequency self -adaptation is communication device under water - Google Patents
Carrier frequency self -adaptation is communication device under water Download PDFInfo
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- CN204967830U CN204967830U CN201520769093.4U CN201520769093U CN204967830U CN 204967830 U CN204967830 U CN 204967830U CN 201520769093 U CN201520769093 U CN 201520769093U CN 204967830 U CN204967830 U CN 204967830U
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- carrier frequency
- signal
- under water
- communication device
- underwater acoustic
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Abstract
The utility model relates to a carrier frequency self -adaptation is communication device under water utilizes under water mobile communication terminal and relaying platform to communicate through underwater sound channel, wired channel of relaying platform the data obtained rethread or wireless channel and land communication device communicate, give land communication device with the information of gathering and save and the analysis. The utility model discloses make the carrier frequency value to dispose, can adjust according to the particular case of channel to the characteristic of adaptation channel, and the utility model discloses stable performance, precision height, frequency conversion rate are soon, frequency shift time phase bit output is continuous, the interference killing feature is strong.
Description
Technical field
The utility model relates to field of underwater acoustic communication, especially a kind of carrier frequency self adaptation underwater communication device.
Background technology
Actual underwater acoustic channel is very complicated, and it also exists the water surface and water-bed two interfaces.Due to the impact of temperature, salinity and static pressure, in water, the different depth velocity of sound is different, there is velocity of sound vertical distribution, and sound wave can be made to produce refraction.The reflection of up-and-down boundary and the refraction in water make actual underwater acoustic channel not be single approach channel but multipath channel.In order to reduce the impact of multi-path jamming, usually adopt non-coherent detection methods.Frequency shift keying communication mode can adopt non-coherent detection methods to realize.Therefore, frequency shift keying is widely used in underwater sound communication.
For traditional frequency shift keying communication mode be applied in underwater sound communication, carrier frequency is fixing, and this causes significant limitation to underwater acoustic channel complicated and changeable under adaptation different marine environment.Acoustic propagation under water primarily of propagation loss, noise and channel time become and space-variant determine.The characteristic of propagation loss, noise and channel by the environment residing for channel and position influence larger.Such as, the acoustic propagation characteristic in inshore region and area, deep-sea and characteristic of channel difference just very large.Underwater sound communication link can be divided into five classes according to distance: overlength, length, medium, short, pole short distance channel.Say the long-haul system of an operating distance at 10-100km, bandwidth is limited in a few kHz.The bandwidth of moderate distance (1-10km) system is in the magnitude of tens of KHz.Only be less than the condition of 100m in distance under, just can obtain the bandwidth more than 100kHz.
Utility model content
The technical problems to be solved in the utility model is: provide a kind of carrier frequency value can carry out the underwater communication device that adjusts, to adapt to underwater acoustic channel characteristic complicated and changeable according to operating distance.
The utility model solves the technical scheme that its technical problem adopts: a kind of carrier frequency self adaptation underwater communication device, comprises mobile communication terminal, relaying platform and land communicator under water; Described mobile communication terminal is under water communicated by underwater acoustic channel with relaying platform; The data that relaying platform obtains are communicated with land communicator by wire message way or wireless channel again, the information of collection are given land communicator and carry out storing and analyzing; Described mobile communication terminal under water comprises measurement module, control module, coding and decoding module, modulator, demodulator and underwater acoustic transducer; The output link control module of described measurement module, the output of control module connects coding and decoding module; The output of described coding and decoding module connects the input of modulator; The output of modulator connects underwater acoustic transducer; The input of described demodulator is connected with the output of underwater acoustic transducer; The output of demodulator connects coding and decoding module; The output of described control module also connects the input of modulator and the input of demodulator respectively.
Further, modulator described in the utility model comprises frequency control word Parasites Fauna, alternative data selector, phase accumulator, sinusoidal ROM look-up table, D/A converter and low pass filter; Single-chip microcomputer to described frequency control word Parasites Fauna write with FSK carrier frequency corresponding to frequency control word; Alternative data selector described in baseband signal controls exports the input of corresponding carrier frequency control word signal to phase accumulator; Described D/A converter exports and obtains corresponding fsk signal through low pass filter.
Further say, demodulator described in the utility model comprises the underwater acoustic transducer acoustical signal receiving system, receiving circuit, digital waveform harvester and the signal processing apparatus that connect successively; Acoustical signal is converted to the signal of telecommunication through underwater acoustic transducer by the fsk signal received by described underwater acoustic transducer acoustical signal receiving system, after receiving circuit process, input digital waveform harvester carry out digital waveform collection, then carry out signal transacting by described signal processor.
The beneficial effects of the utility model are, solve the defect existed in background technology, make carrier frequency value configurable, can adjust, with the characteristic of adaptive channel according to the concrete condition of channel; And the utility model stable performance, precision are high, frequency inverted speed is fast, frequency shift time phase output continuous, antijamming capability is strong.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 theory diagram that to be subsurface communication terminal carry out with land communicator communicates;
Fig. 2 is the functional block diagram of mobile communication terminal under water;
Fig. 3 is FSK modulator function structured flowchart;
Fig. 4 is the theory diagram of demodulator.
Embodiment
With preferred embodiment, the utility model is described in further detail by reference to the accompanying drawings now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
Subsurface communication terminal as shown in Figure 1 and land communicator carry out the block diagram communicated;
In general, mobile communication terminal is for measuring or checkout gear under water, is used for measuring or monitoring underwater information, as temperature, pressure, sound etc.Relaying platform, as the relay point of subsurface communication and marine communication, can be fixing, as the fixture on bank; Also can be mobile, as some relaying platform is positioned on the lash ship that move.Mobile communication terminal is communicated by underwater acoustic channel with relaying platform under water.The data that relaying platform obtains are communicated with land communicator by wire message way or wireless channel again, the information of collection are given land communicator and carry out storing and analyzing.
The functional block diagram of mobile communication terminal is as Fig. 2 under water.Wherein measurement module is measured or is monitored the underwater information obtained, send control module to, data are encoded by coding module by control module, then 2FSK digital modulation is carried out by modulator, 2FSK becomes acoustical signal by underwater acoustic transducer by digital signal, transmitted by underwater acoustic channel, after relaying platform receives, the information of collection is forwarded to land communicator and carries out storing and analyzing.The order that relaying platform sends and confirmation, after underwater acoustic channel transmission, become the signal of telecommunication by underwater acoustic transducer from voice signal, through digital demodulation, send control module to after decoding.
The course of work and step are:
1, when mobile communication terminal is devoted to precalculated position in water at first under water, according to the distance of relaying platform empirically data determination initial carrier frequency communicate.
2, under water in mobile communication terminal moving process, measure the distance of mobile communication terminal and relaying platform under water, method of measurement is:
Collect message by transmission time information to measure, the moment sending message is written in message in the mode of timestamp.Suppose that message is T from the transmitting time stamp that mobile communication terminal sends message along forward path under water
z1, the time of reception of the message that relaying platform receives along forward path is T
z2; The time of reception that mobile communication terminal receives message along reverse path is under water T
f1, the transmitting time stamp that relaying platform sends message along reverse path is T
f2; If the propagation delay time of mobile communication terminal and relaying platform is t under water
d, the clock jitter of two nodes is Δ t;
Then
T
z2=T
z1+ t
d+ Δ t formula 1
T
f1=T
f2+ t
d-Δ t formula 2
Can be obtained fom the above equation
The then distance of now mobile communication terminal and relaying platform under water: l=340t
d
3, determine carrier reference according to distance and carry out mark frequency and the space frequency of 2FSK communication.Defining method is:
First select several groups of typical range values and corresponding by the carrier frequency that uses as stand-off distance values and frequency values.Linear interpolation is adopted to calculate distance carrier frequency corresponding within the scope of corresponding reference range.As, reference range l
a, l
bcorresponding carrier frequency is respectively f
a, f
b, then the mobile communication terminal under water calculated according to linear interpolation and the distance l (l of relaying platform
a<l<l
b) corresponding to carrier reference be:
On obtained reference frequency basis, carry out suitable adjustment, can obtain the mark frequency and the space frequency that carry out 2FSK communication, if mark frequency is 0.9f, space frequency is 1.1f.
Be the situation explanation embodiment of 1Km, 10Km below with reference range.Be the distance of 1Km, 10Km for reference range, according to underwater acoustic channel situation and empirical data, often selecting corresponding carrier frequency to be the frequency of about 50KHz and about 10KHz is carrier reference.
According to above computational methods, the distance l for mobile communication terminal and relaying platform is under water the situation of 5Km, then corresponding carrier reference is: 34KHz.Carry out suitable adjustment, can obtain the mark frequency and the space frequency that carry out 2FSK communication, if mark frequency is 30.6KHz, space frequency is 37.4KHz.
4, after new communication frequency is determined, mobile communication terminal sends message to relaying platform and informs new traffic frequency under water, and waits for that relaying platform sends confirmation message.After receiving confirmation message, namely mobile communication terminal and relaying platform prepare change communication frequency is under water new communication frequency.
5, communicate with new communication frequency, need the change carrier frequency of modulator and the relevant parameter of demodulator.
FSK modulator function structured flowchart is as Fig. 3, and principal functional structure is made up of phase accumulator, sinusoidal ROM look-up table, D/A conversion, low pass filter, frequency control word Parasites Fauna, alternative data selector etc.
Single-chip microcomputer to frequency register group write with FSK carrier frequency corresponding to frequency control word; Suppose that determined new FSK carrier frequency is respectively f
0, f
1, then the frequency control word producing corresponding frequencies is respectively: K
0for to f
0/ 10 round, K
1for to f
1/ 10 round.
Baseband signal controls alternative data selector and exports the input of corresponding carrier frequency control word signal to phase accumulator; According to the operation principle of DDS, D/A conversion exports and can obtain corresponding fsk signal through low-pass filtering.
In specific implementation process, the scope that can arrange carrier frequency value is 100Hz-200KHz, frequency step 10Hz.The needs of most of actual underwater environment can be met with the parameter of upper frequency range and frequency step.
If K is frequency control word, selecting system clock f
c=655.36KHz,
According to frequency step
obtain N=16, namely phase accumulator word length is 16.
Output frequency
set by considering, the scope of carrier frequency value is 100Hz-200KHz, then frequency control word span is 10≤K≤20000.
Supposing that determined new FSK carrier frequency is respectively mark frequency is 30.6KHz, and space frequency is 37.4KHz, then the frequency control word producing corresponding frequencies is respectively: K
0be 3060, K
1be 3740.
Need the relevant parameter of the demodulator changing mobile communication terminal and relaying platform under water simultaneously.The theory diagram of demodulator is as Fig. 4.Acoustical signal is converted to the signal of telecommunication through underwater acoustic transducer by the fsk signal received, and gathers through the laggard line number character waveform of receiving circuit process, i.e. A/D conversion, then carries out signal transacting by digital signal processor.Signal transacting is completed by software, the fsk signal carrier frequency received is changed to the situation of new frequency, needs the parameter changing corresponding signal processing module, as the parameter such as coefficient of filter.
The just embodiment of the present utility model described in above specification, various illustrating is not construed as limiting flesh and blood of the present utility model, person of an ordinary skill in the technical field after having read specification can to before described embodiment make an amendment or be out of shape, and do not deviate from essence and the scope of utility model.
Claims (3)
1. a carrier frequency self adaptation underwater communication device, is characterized in that: comprise mobile communication terminal, relaying platform and land communicator under water; Described mobile communication terminal is under water communicated by underwater acoustic channel with relaying platform; The data that relaying platform obtains are communicated with land communicator by wire message way or wireless channel again, the information of collection are given land communicator and carry out storing and analyzing; Described mobile communication terminal under water comprises measurement module, control module, coding and decoding module, modulator, demodulator and underwater acoustic transducer; The output link control module of described measurement module, the output of control module connects coding and decoding module; The output of described coding and decoding module connects the input of modulator; The output of modulator connects underwater acoustic transducer; The input of described demodulator is connected with the output of underwater acoustic transducer; The output of demodulator connects coding and decoding module; The output of described control module also connects the input of modulator and the input of demodulator respectively.
2. a kind of carrier frequency self adaptation underwater communication device as claimed in claim 1, is characterized in that: described modulator comprises frequency control word Parasites Fauna, alternative data selector, phase accumulator, sinusoidal ROM look-up table, D/A converter and low pass filter; Single-chip microcomputer to described frequency control word Parasites Fauna write with FSK carrier frequency corresponding to frequency control word; Alternative data selector described in baseband signal controls exports the input of corresponding carrier frequency control word signal to phase accumulator; Described D/A converter exports and obtains corresponding fsk signal through low pass filter.
3. a kind of carrier frequency self adaptation underwater communication device as claimed in claim 1, is characterized in that: described demodulator comprises the underwater acoustic transducer acoustical signal receiving system, receiving circuit, digital waveform harvester and the signal processing apparatus that connect successively; Acoustical signal is converted to the signal of telecommunication through underwater acoustic transducer by the fsk signal received by described underwater acoustic transducer acoustical signal receiving system, after receiving circuit process, input digital waveform harvester carry out digital waveform collection, then carry out signal transacting by described signal processor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336619A (en) * | 2019-07-05 | 2019-10-15 | 李利 | A kind of Sea Mobile Communication equipment |
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2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336619A (en) * | 2019-07-05 | 2019-10-15 | 李利 | A kind of Sea Mobile Communication equipment |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160113 Termination date: 20180930 |