CN106506418A - Wideband 2ASK signal generating circuits in cognitive underwater sound communication - Google Patents

Wideband 2ASK signal generating circuits in cognitive underwater sound communication Download PDF

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Publication number
CN106506418A
CN106506418A CN201610896158.0A CN201610896158A CN106506418A CN 106506418 A CN106506418 A CN 106506418A CN 201610896158 A CN201610896158 A CN 201610896158A CN 106506418 A CN106506418 A CN 106506418A
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CN
China
Prior art keywords
underwater sound
circuit
wideband
voltage
2ask
Prior art date
Application number
CN201610896158.0A
Other languages
Chinese (zh)
Inventor
龚润航
朱昌平
高远
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河海大学常州校区
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 河海大学常州校区 filed Critical 河海大学常州校区
Priority to CN201610896158.0A priority Critical patent/CN106506418A/en
Publication of CN106506418A publication Critical patent/CN106506418A/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/382Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/0014Carrier regulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/02Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04Modulator circuits; Transmitter circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/10Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12Modulator circuits; Transmitter circuits
    • H04L27/122Modulator circuits; Transmitter circuits using digital generation of carrier signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/0014Carrier regulation
    • H04L2027/0024Carrier regulation at the receiver end
    • H04L2027/0026Correction of carrier offset

Abstract

The invention discloses the wideband 2ASK signal generating circuits in a kind of cognitive underwater sound communication, including be sequentially connected core processor, Voltage-Controlled oscillation circuit, peaker, not gate shaping circuit, drive signal generation circuit, power amplifier, match circuit, underwater acoustic transducer.Using VCO and analog signal processing technology, in the case where drive signal generation circuit structure and driving force is not changed, frequency conversion of the underwater sound 2ASK signals in broad frequency band is realized by adjusting synchronous signal frequency, hardware foundation is provided for dynamic spectrum access technology in cognitive underwater sound communication system.

Description

Wideband 2ASK signal generating circuits in cognitive underwater sound communication

Technical field

The present invention relates to the wideband 2ASK signal generating circuits in a kind of cognitive underwater sound communication, belong to Communication Electronic Circuits neck Domain.

Background technology

In underwater sound communication system, due to the effect of the factors such as absorption, scattering, reflection, geometry extension, high frequency sound wave is in water In propagation attenuation very big.Research shows, the change of frequency and the amplitude attenuation factor exponent function relation of its sound intensity.Work as transmitting Frequency higher, when transmission range is more remote, then the signal amplitude for receiving is also less.Underwater sound communication has using frequency band very much Limit, common underwater sound communication frequency band cover 0~15kHz of low-frequency range, 15~150kHz of Mid Frequency, and high band 150~ 1500kHz, the system of operating distance l~10km are usually used the frequency of 10~100KHz of the upper limit, at this moment work in system more Shallow sea.The first-selected frequency range of telecommunication is 0~20kHz.Further, since spread speed of the sound wave in water is about 1500 20 a ten thousandths of meter per second, only electromagnetic wave spread speed in atmosphere, therefore compared with the communication of land, propagation under water Time delay is very big.With the further development of water sound communication technique, people increasingly increase to the demand of subsurface communication, and limited is logical Letter frequency band will necessarily bring the nervous problem of frequency spectrum resource.Therefore, how reasonable distribution frequency spectrum resource under water, improve frequency spectrum profit With rate, just become the key issue for improving underwater sound communication performance.

Cognitive radio technology is a kind of intelligent communication new technique for proposing in terrestrial radio Communication Studies in recent years.It with Dynamic spectrum access mode, makes unlicensed band user(Also referred to as secondary user)With authorized frequency bands user(Also referred to as primary user)Shared frequency Spectrum resource, so that improve the utilization rate of frequency spectrum.The basic thought of cognitive communications is to make wireless terminal wireless by perceiving surrounding The history of environment and the present situation adjusting the configured transmission of oneself, using most suitable Radio Resource (including frequency, modulation methods Formula, transmission power etc.) completing to be wirelessly transferred, relate generally to frequency spectrum perception technology and spectrum analyses, decision, distribution and movement etc. The technology such as dynamic spectrum resource management.As the thought of cognitive radio can allow wireless terminal efficiently many using frequency spectrum resource, adaptation The wireless environment of change, therefore in the subsurface communication that band limiting, environment are complicated, the particularly subsurface communication of multi-user, two-forty In have very big development potentiality.

Underwater sound signal generator is one of key equipment in cognitive underwater sound communication system.As realizing dynamic spectrum access Basis, which needs to export underwater sound signal in 1,000 to the hundreds of KHz broadband.But the underwater sound on the market sets at present Standby generally existing is expensive, produces the narrow shortcoming of signal frequency range.

Content of the invention

Expensive in order to solve existing underwater sound equipment generally existing at present on the market, produce that signal bandwidth is narrow to ask Topic, the invention provides a kind of wideband 2ASK signal generating circuits for cognitive underwater sound communication.

In order to solve the above problems, the technical solution used in the present invention is:Wideband 2ASK letters in cognitive underwater sound communication Number produce circuit, it is characterised in that include:

For processing sampled voltage and producing the core processor of frequency control voltage;

The Voltage-Controlled oscillation circuit being connected with core processor;

It is connected peaker with Voltage-Controlled oscillation circuit;

It is connected with peaker, for producing the not gate shaping circuit of synchronizing signal;

The drive signal generation circuit of NAND gate shaping circuit connection;

It is connected with drive signal generation circuit, for amplifying the power amplifier of underwater sound signal;

The match circuit being connected with power amplifier;

It is connected with match circuit, for launching the underwater acoustic transducer of underwater sound signal.

Further technical scheme is:

The match circuit passes through current transformer and voltage sample resistance, to the reality that core processor sends underwater acoustic transducer end When current-voltage waveform.

The not gate shaping circuit is formed in parallel by two phase inverters, and inverter input connects pull-up resistor to power supply, should Circuit by differential after positive negative pulse stuffing ripple signal compensation, upset for dutycycle less than 10% positive pulse waveform, as synchronous letter Number.

The voltage-controlled oscillator circuit is by the external oscillation resistance in chip R1, R2 ends and C1A, C1B end and capacitor charge and discharge To produce basic square-wave signal, then the magnitude of voltage being input into by chip Freq Control ends is inclined come the frequency that controls square-wave signal Move.

The underwater acoustic transducer is piezoelectric transducer, and resonant frequency is at least 1kHz, is at most 200kHz.

The core processor adopts single-chip microcomputer MSP430F149 chips, using 3.3V DC-voltage supplies.

The phase inverter adopts 74HC04 chips.

The invention has the beneficial effects as follows:Using VCO and analog signal processing technology, do not changing drive signal product In the case of raw circuit structure and driving force, underwater sound 2ASK signals are realized in broad frequency band by adjusting synchronous signal frequency Interior frequency conversion, provides hardware foundation for dynamic spectrum access technology in cognitive underwater sound communication system.

Description of the drawings

Fig. 1 is the wideband 2ASK signal generating circuit structured flowcharts in cognition underwater sound communication of the invention.

Fig. 2 is VCO, differential, not gate shaping and drive signal generation circuit figure.

Fig. 3 is the measured waveform figure that wideband 2ASK signals produce each stage.

Specific embodiment

The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for the present invention is clearly described Technical scheme, and can not be limited the scope of the invention with this.

As shown in figure 1, the wideband 2ASK signal generating circuits in cognitive underwater sound communication include core processor, VCO Circuit, peaker, not gate shaping circuit, drive signal generation circuit, power amplifier, match circuit, underwater acoustic transducer.

Core processor is used for processing sampled voltage and producing frequency control voltage;Voltage-Controlled oscillation circuit and core processor Connection;Peaker is connected with Voltage-Controlled oscillation circuit;Not gate shaping circuit is connected with peaker, for producing synchronous letter Number;Drive signal generation circuit NAND gate shaping circuit connects;Power amplifier is connected with drive signal generation circuit, for putting Big underwater sound signal;Match circuit is connected with power amplifier;Underwater acoustic transducer is connected with match circuit, for launching underwater sound letter Number.The match circuit passes through current transformer and voltage sample resistance, to the reality that core processor sends underwater acoustic transducer end When current-voltage waveform.The not gate shaping circuit is formed in parallel by two phase inverters, and inverter input connects pull-up resistor extremely Power supply, the circuit by differential after positive negative pulse stuffing ripple signal compensation, upset for dutycycle less than 10% positive pulse waveform, as Synchronizing signal.The underwater acoustic transducer is piezoelectric transducer, and resonant frequency is at least 1kHz, is at most 200kHz;The core Heart processor adopts single-chip microcomputer MSP430F149 chips, using 3.3V DC-voltage supplies;The phase inverter adopts 74HC04 cores Piece.

It is voltage-controlled oscillator circuit, not gate shaping circuit, peaker and drive signal generation circuit respectively in Fig. 2.Its In, voltage-controlled oscillator circuit uses the VCO function in phase-locked loop chip CD4046, by chip R1, R2 ends and C1A, C1B The external oscillation resistance in end produces basic square-wave signal, then the electricity being input into by chip Freq Control ends with capacitor charge and discharge Pressure value is controlling the frequency shift (FS) of square-wave signal.The square-wave signal of voltage-controlled oscillator circuit output is in the RC peakers of rear end Positive negative pulse stuffing ripple signal is shaped to, is changed into positive pulse ripple of the dutycycle less than 10% after the upset of not gate shaping circuit, compensation Shape, by two divided-frequency behind the SYNC ends of signal entrance SG3525 pwm chips, exports the two-way ultrasound-driven of with same frequency and reversed-phase Signal.Meanwhile, the IN+ ends for exporting modulated signal to the chip by single-chip microcomputer, to realize that 2ASK is modulated.

When wideband 2ASK signal generating circuits in cognitive underwater sound communication work, by core processor in DAC produce pressure The input voltage of control oscillating circuit, voltage-controlled oscillator circuit, not gate shaping circuit, peaker and drive signal generation circuit warp After above-mentioned signal shaping is processed, drive power amplifier to carry out inversion, complete the power amplification of underwater sound signal, the signal warp after amplification After match circuit realizes impedance and phase matched, underwater acoustic transducer is driven to launch the acoustic signals of setpoint frequency.Meanwhile, coupling electricity Road passes through current transformer and voltage sample resistance, to the real-time current voltage wave that core processor feeds back underwater acoustic transducer end Shape, core processor compare its phase place, the working condition of real-time monitoring underwater acoustic transducer.If the frequency of 2ASK signals need to be changed, Conveniently can be realized by adjusting Voltage-Controlled oscillation circuit input voltage and match circuit parameter.

The measured waveform figure in each stage is produced in Fig. 3 for wideband 2ASK signals.As can be seen that in 324kHz pulse signals Under effect, SG3525 chips export the two-way ultrasound drive signals of 162kHz with same frequency and reversed-phase.The drive signal control half-bridge power amplifier Work, each test point waveform meet expected design.Meanwhile, the electric current that collects from transducer end, voltage are changed in homophase, explanation Energy device is in stable resonant condition.The frequency modulating signal of 2ASK modulated signals is 159Hz, and carrier frequency is 162kHz.

Ultimate principle, principal character and the advantage of the present invention has been shown and described above.The technical staff of the industry should Understand, the present invention is not restricted to the described embodiments, the original that the present invention is simply described described in above-described embodiment and description Reason, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes and improvements Both fall within scope of the claimed invention.The claimed scope of the invention is by appending claims and its equivalent circle. Fixed.

Claims (7)

1. wideband 2ASK signal generating circuits in cognitive underwater sound communication, it is characterised in that include:
For processing sampled voltage and producing the core processor of frequency control voltage;
The Voltage-Controlled oscillation circuit being connected with core processor;
The peaker being connected with Voltage-Controlled oscillation circuit;
It is connected with peaker, for producing the not gate shaping circuit of synchronizing signal;
The drive signal generation circuit of NAND gate shaping circuit connection;
It is connected with drive signal generation circuit, for amplifying the power amplifier of underwater sound signal;
The match circuit being connected with power amplifier;
It is connected with match circuit, for launching the underwater acoustic transducer of underwater sound signal.
2. wideband 2ASK signal generating circuits in cognitive underwater sound communication according to claim 1, it is characterised in that:Described , by current transformer and voltage sample resistance, the real-time current for sending underwater acoustic transducer end to core processor is electric for match circuit Corrugating.
3. wideband 2ASK signal generating circuits in cognitive underwater sound communication according to claim 1, it is characterised in that:Described Not gate shaping circuit is formed in parallel by two phase inverters, and inverter input connects pull-up resistor to power supply, after the circuit is by differential Positive negative pulse stuffing ripple signal compensation, upset for dutycycle less than 10% positive pulse waveform, as synchronizing signal.
4. wideband 2ASK signal generating circuits in cognitive underwater sound communication according to claim 1, it is characterised in that:Described Voltage-controlled oscillator circuit produces square foundation by the external oscillation resistance in chip R1, R2 ends and C1A, C1B end and capacitor charge and discharge Ripple signal, then the magnitude of voltage being input into by chip Freq Control ends is controlling the frequency shift (FS) of square-wave signal.
5. wideband 2ASK signal generating circuits in cognitive underwater sound communication according to claim 1, it is characterised in that:Described Underwater acoustic transducer is piezoelectric transducer, and resonant frequency is at least 1kHz, is at most 200kHz.
6. wideband 2ASK signal generating circuits in cognitive underwater sound communication according to claim 1, it is characterised in that:Described Core processor adopts single-chip microcomputer MSP430F149 chips, using 3.3V DC-voltage supplies.
7. wideband 2ASK signal generating circuits in cognitive underwater sound communication according to claim 3, it is characterised in that:Described Phase inverter adopts 74HC04 chips.
CN201610896158.0A 2016-10-13 2016-10-13 Wideband 2ASK signal generating circuits in cognitive underwater sound communication CN106506418A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108206702A (en) * 2018-01-11 2018-06-26 福建星海通信科技有限公司 A kind of deep-sea communication equipment
CN108847831A (en) * 2018-05-29 2018-11-20 昆明理工大学 A kind of high-performance pulse signal processing circuit and its implementation method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2181232Y (en) * 1993-10-30 1994-11-02 龙曙华 Infrared remote-controlled transmitting and receiving device for electrically operated curtain
CN102611662A (en) * 2012-02-14 2012-07-25 河海大学常州校区 Underwater acoustic modem with low cost and low power consumption
CN103252314A (en) * 2013-05-13 2013-08-21 河海大学常州校区 Dynamic matching device of ultrasonic power supply and method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2181232Y (en) * 1993-10-30 1994-11-02 龙曙华 Infrared remote-controlled transmitting and receiving device for electrically operated curtain
CN102611662A (en) * 2012-02-14 2012-07-25 河海大学常州校区 Underwater acoustic modem with low cost and low power consumption
CN103252314A (en) * 2013-05-13 2013-08-21 河海大学常州校区 Dynamic matching device of ultrasonic power supply and method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108206702A (en) * 2018-01-11 2018-06-26 福建星海通信科技有限公司 A kind of deep-sea communication equipment
CN108847831A (en) * 2018-05-29 2018-11-20 昆明理工大学 A kind of high-performance pulse signal processing circuit and its implementation method
CN108847831B (en) * 2018-05-29 2020-08-25 昆明理工大学 High-performance pulse signal processing circuit and implementation method thereof

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Application publication date: 20170315