CN201869189U - Underwater wireless acoustic sensor network node ultrasonic transmission circuit based on DDS (Direct Digital Synthesis) technology - Google Patents
Underwater wireless acoustic sensor network node ultrasonic transmission circuit based on DDS (Direct Digital Synthesis) technology Download PDFInfo
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- CN201869189U CN201869189U CN2010206100119U CN201020610011U CN201869189U CN 201869189 U CN201869189 U CN 201869189U CN 2010206100119 U CN2010206100119 U CN 2010206100119U CN 201020610011 U CN201020610011 U CN 201020610011U CN 201869189 U CN201869189 U CN 201869189U
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- transmission circuit
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Abstract
The utility model relates to the technical field of underwater wireless acoustic sensor networks, in particular to an underwater wireless acoustic sensor network node ultrasonic transmission circuit based on the DDS technology. The ultrasonic transmission circuit comprises an ultrasonic signal transmission circuit, a power amplifier, a transformer and matching network and an ultrasonic transducer, which are electrically and sequentially connected. The ultrasonic transmission circuit adopts DDS as an underwater ultrasonic communication signal source in order to generate ultrasonic signals with stable frequency and phase, and moreover, the ultrasonic transmission circuit can meet the requirement on high-speed signal frequency switching, reduces the cost related to signal generation, and has the advantages of low error rate, low energy consumption, high communication success rate and the like.
Description
Technical field
The utility model relates to the underwater wireless sensor network technical field, relates in particular to a kind of underwater wireless sensor network node ultrasound emission circuit based on the DDS technology.
Background technology
Along with the develop rapidly of global land wireless sensor network, be that the underwater sensor network of transmission medium has obtained increasing attention and fund input gradually with the underwater ultrasound.(underwater acoustic sensor networks UWASN) has boundless application prospect to underwater sensor network, is applied in multiple Underwater Engineering and research field widely.Yet existing underwater sensor network and radiating circuit exist following shortcoming:
(1) underwater acoustic channel poor transmission.Problems such as multipath, decay and Doppler frequency shift make the temporary disruption of error rate height, link of subsurface communication happen occasionally.This is one of important difference of underwater sensor network and land on-air radio sensor network.
(2) battery is limited in one's ability.The network node of underwater sensor radiating circuit carries the very limited battery of energy usually.Because underwater sensor node radiating circuit distribution water surface zone is wide, and the underwater environment complexity, the network node radiating circuit is not recovered usually, so the node radiating circuit is unpractical by changing battery to replenish the energy.
(3) communication capacity is limited.Underwater acoustic communication mainly is subjected to path loss, multipath, many ways, noise, Doppler frequency shift, propagation delay length and the variable influence of time-delay.
(4) existing ultrasound emission processing of circuit frequency plot is accurate fast inadequately, and poor stability, and the output waveform distortion is big.
These shortcomings are unfavorable for effective transmission of data, can't realize point-to-point reliably real time communication under water, thereby have reduced the practicality of distributed underwater wireless sensor network.
The utility model content
Technical problem at above-mentioned existence, the purpose of this utility model provides a kind of underwater wireless sensor network node ultrasound emission circuit based on the DDS technology, the radiating circuit battery that overcomes existing underwater wireless sensor network is limited in one's ability, communication capacity is limited, handle frequency plot inadequately fast accurately, the big deficiency that waits of output waveform distortion, the digital signal that will launch is converted to analog signal, it is carried out voltage amplification and amplitude adjusted, then signal is delivered to power amplifier.With DDS as underwater ultrasound communication signal source, produce all stable ultrasonic signal of frequency plot to reach, and can satisfy the requirement of high speed switching signal frequency, and simplified the expense of signal generation aspect, have advantages such as low error rate, low energy consumption and high communication success rate.
For achieving the above object, the utility model adopts following technical scheme:
A kind of underwater wireless sensor network node ultrasound emission circuit based on the DDS technology comprises:
Ultrasonic signal radiating circuit, power amplifier, transformer and matching network, ultrasonic transducer;
Wherein, ultrasonic signal radiating circuit, power amplifier, transformer and matching network, ultrasonic transducer order electrical connection successively.
Described ultrasonic signal radiating circuit is made up of supersonic signal generator, voltage amplifier stage, follow circuit; Described follow circuit is made up of digital regulation resistance and emitter follower;
Described ultrasonic signal radiating circuit is electrically connected according to supersonic signal generator, voltage amplifier stage, digital regulation resistance, emitter follower order successively.
Described supersonic signal generator adopts AD9850 to constitute; Described voltage amplifier stage adopts TL072 to constitute; Described digital regulation resistance adopts MCP41010 to constitute.
Described power amplifier adopts power amplification chip AD8397 to constitute.
The equivalent Rs of described transformer and matching network and Xs are 1201-j1896, and wherein C is 2098pF;
The operating frequency of described ultrasonic transducer is 40.0KHz.
The utlity model has following advantage and good effect:
1) the utility model DDS technology has the advantage that can accurately and apace handle frequency and phase place under the control of digital processing unit, and frequency and phase resolution are fairly good, can carry out signal transformation fast.DDS module of the present utility model, promptly supersonic signal generator can produce all stable ultrasonic signal of frequency plot, satisfies the requirement of high speed switching signal frequency, and has reduced development difficulty, is convenient to writing that back operation system drives;
2) the utility model TL072 is the operational amplifier of a kind of high bandwidth, high conversion rate, low noise, low input off-set voltage and low input drift current, is suitable as very much ultrasonic simulation front end operational amplifier;
3) the utility model added emitter follower before the ultrasonic power amplifier, with its intergrade as multistage amplifier circuit, and influencing each other between the level before and after can isolating.
Description of drawings
Fig. 1 is the underwater wireless sensor network node ultrasound emission circuit structure diagram based on the DDS technology of the present utility model.
Fig. 2 is the DDS module circuit diagram of the AD9850 that provides of the utility model.
Fig. 3 is TL072 voltage amplifier circuit figure of the present utility model.
Fig. 4 is AD8397 power amplifier figure of the present utility model.
Fig. 5 is transformer of the present utility model and matching network.
Embodiment
The utility model is described in further detail in conjunction with the accompanying drawings with specific embodiment below:
The underwater wireless sensor network node ultrasound emission circuit that the utility model proposes based on the DDS technology, specifically adopted following technical scheme, referring to Fig. 1, mainly comprise the ultrasonic signal radiating circuit, power amplifier, transformer and matching network, ultrasonic transducer four parts, and according to the ultrasonic signal radiating circuit, power amplifier, transformer and matching network, the order of ultrasonic transducer connects successively.
Ultrasonic signal radiating circuit in the utility model is made up of supersonic signal generator, voltage amplifier stage and follow circuit.The ultrasonic signal radiating circuit is according to supersonic signal generator, voltage amplifier stage, digital regulation resistance, being linked in sequence of emitter follower.Supersonic signal generator adopts AD9850, to reach the requirement that produces all stable ultrasonic signal of frequency plot and satisfy high speed switching signal frequency.AD9850 is a high integration DDS frequency synthesizer, and its inside comprises DDS able to programme system, high-performance DAC and tells comparator, can realize the frequency synthesizer and the clock generator of digital programming Control.Connect the precision interval clock source, AD9850 can produce that frequency spectrum is pure, frequency and all analog sine output of control able to programme of phase place.This sine wave can directly be used as frequency signal source or convert square wave to and export as clock.The control of AD9850 interface is simple, and performance is higher, and power consumption is few.AD9850 adopts 32 phase accumulators, blocks into 14, the input sine look up table, and question blank output is blocked into 10, is input to DAC.Analog current is starved in two complementations of DAC output, receives on the filter.Regulate DAC full scale output current, need an external resistance R set, it regulates relational expression Iset=32 (1.248V/Rset), and the full scale electric current is 10 ~ 20mA, sees Fig. 2.The DDS wave generator circuit is mainly used to realize the generation of signal, produce the sine wave of corresponding frequencies, and the offset of sinusoidal ripple adds up accordingly, filtering, obtains required ultrasonic primary signal.
Ultrasonic signal radiating circuit in the utility model adopts TL072 as voltage amplifier stage.The analog signal that DDS comes out is the voltage signal of Vpp=1.78v, it is carried out voltage amplification signal should be converted into the bigger voltage signal of Vpp, carries out power amplification again.TL072 is the operational amplifier of a kind of high bandwidth, high conversion rate, low noise, low input off-set voltage and low input drift current, and these characteristics have determined TL072 to be suitable as very much ultrasonic simulation front end operational amplifier.Seeing Fig. 3, is 6.8V through the output voltage peak-to-peak value after the voltage amplification.
In the ultrasonic signal radiating circuit in the utility model, follow circuit is made up of digital regulation resistance and emitter follower, and wherein digital regulation resistance adopts MCP41010.The ultrasound emission circuit is by the power of digital regulation resistance control ultrasound emission circuit, and the amplitude of regulation voltage output is regulated ultrasound emission power.MCP41010 is the digital control potentiometer of little core 256 taps, and total resistance has 1k Ω, 10k Ω, and 50k Ω, 100k Ω etc. adopt the SPI interface to be configured, single 5V power supply.Before the ultrasonic power amplifier, add emitter follower.Utilize its input resistance height,, can be used as the input stage of ultrasonic power amplifier from the little characteristics of signal source current drawn; Utilize its output resistance low, the characteristics that carrying load ability is strong can be used as the output stage of ultrasound emission circuit.With its intergrade as multistage amplifier circuit, influencing each other between the level before and after can isolating.
Power amplifier in the utility model adopts the power amplification chip AD8397 of AD company.See Fig. 4, AD8397 is the audio-frequency power amplifier of two-channel 2-4-5W, rail-to-rail voltage output, the wide power voltage supply of 10V-24V, the bandwidth of AD8397 can reach 20Hz-100kHz, satisfies the centre frequency f0=40kHz of sensor node underwater sound radiating circuit fully, the requirement of bandwidth deltaf f=10kHz.The two-way power amplifier of AD8397 has independently input/output terminal, when the underwater sound is received, DDS partly can be turn-offed, and such design is for the consideration of saving the network node energy.For preventing the interference of DC power supply, near the pin of the positive-negative power of AD8397, increase by the shunt capacitance of 0.1 μ F, to prevent High-frequency Interference; Increase by the electric capacity of 100 μ F, prevent low-frequency disturbance.Before the ingoing power amplifier that transmits, seal in one 1 μ F electric capacity, play the effect that excludes the DC component that transmits.
Transformer in the utility model and matching network are used for realizing the impedance matching between power amplifier and the ultrasonic transducer.Its equivalent Rs and Xs are that 1201-j1896(C is 2098pF).In order to mate with transistor power supply, through calculating, primary consumer is 12.4 ohm, and turn ratio is 18.4, sees Fig. 5.
Ultrasonic transducer in the utility model is converted into acoustical signal to the signal of telecommunication, and it need be operated in " best reception state " operating frequency is 40.0KHz.
Above embodiment is only for the usefulness that the utility model is described; but not to restriction of the present utility model; person skilled in the relevant technique; under the situation that does not break away from spirit and scope of the present utility model; can also make various conversion or modification; therefore all technical schemes that are equal to all fall into protection range of the present utility model.
Claims (5)
1. the underwater wireless sensor network node ultrasound emission circuit based on the DDS technology is characterized in that, comprising:
Ultrasonic signal radiating circuit, power amplifier, transformer and matching network, ultrasonic transducer;
Wherein, ultrasonic signal radiating circuit, power amplifier, transformer and matching network, ultrasonic transducer order electrical connection successively.
2. the underwater wireless sensor network node ultrasound emission circuit based on the DDS technology according to claim 1 is characterized in that:
Described ultrasonic signal radiating circuit is made up of supersonic signal generator, voltage amplifier stage, follow circuit; Described follow circuit is made up of digital regulation resistance and emitter follower;
Described ultrasonic signal radiating circuit is electrically connected according to supersonic signal generator, voltage amplifier stage, digital regulation resistance, emitter follower order successively.
3. the underwater wireless sensor network node ultrasound emission circuit based on the DDS technology according to claim 2 is characterized in that:
Described supersonic signal generator adopts AD9850 to constitute; Described voltage amplifier stage adopts TL072 to constitute; Described digital regulation resistance adopts MCP41010 to constitute.
4. the underwater wireless sensor network node ultrasound emission circuit based on the DDS technology according to claim 1 is characterized in that:
Described power amplifier adopts power amplification chip AD8397 to constitute.
5. the underwater wireless sensor network node ultrasound emission circuit based on the DDS technology according to claim 1 is characterized in that:
The equivalent Rs of described transformer and matching network and Xs are 1201-j1896, and wherein C is 2098pF;
The operating frequency of described ultrasonic transducer is 40.0KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206100119U CN201869189U (en) | 2010-11-17 | 2010-11-17 | Underwater wireless acoustic sensor network node ultrasonic transmission circuit based on DDS (Direct Digital Synthesis) technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206100119U CN201869189U (en) | 2010-11-17 | 2010-11-17 | Underwater wireless acoustic sensor network node ultrasonic transmission circuit based on DDS (Direct Digital Synthesis) technology |
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| Publication Number | Publication Date |
|---|---|
| CN201869189U true CN201869189U (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206100119U Expired - Fee Related CN201869189U (en) | 2010-11-17 | 2010-11-17 | Underwater wireless acoustic sensor network node ultrasonic transmission circuit based on DDS (Direct Digital Synthesis) technology |
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| Country | Link |
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| CN (1) | CN201869189U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217483A (en) * | 2013-02-05 | 2013-07-24 | 南京夏能达电子科技有限公司 | Transformer coupling method of ultrasonic transmitter circuit and single-power-supply amplifier |
| CN107645311A (en) * | 2017-09-26 | 2018-01-30 | 天津光电通信技术有限公司 | One kind is with underwater sound sensing multi-node system |
-
2010
- 2010-11-17 CN CN2010206100119U patent/CN201869189U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217483A (en) * | 2013-02-05 | 2013-07-24 | 南京夏能达电子科技有限公司 | Transformer coupling method of ultrasonic transmitter circuit and single-power-supply amplifier |
| CN107645311A (en) * | 2017-09-26 | 2018-01-30 | 天津光电通信技术有限公司 | One kind is with underwater sound sensing multi-node system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20111117 |