CN202979011U - Group multiuser underwater acoustic communication Modem - Google Patents
Group multiuser underwater acoustic communication Modem Download PDFInfo
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- CN202979011U CN202979011U CN 201220455277 CN201220455277U CN202979011U CN 202979011 U CN202979011 U CN 202979011U CN 201220455277 CN201220455277 CN 201220455277 CN 201220455277 U CN201220455277 U CN 201220455277U CN 202979011 U CN202979011 U CN 202979011U
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Abstract
The utility model discloses a group multiuser underwater acoustic communication Modem which belongs to the technical field of underwater acoustic communication. Particularly, the structure of the group multiuser underwater acoustic communication Modem realizes multiuser communication is realized through direct sequence spectrum spreading scrambling based on MFSK modulation/demodulation. The group multiuser underwater acoustic communication Modem is characterized in that: the transmitting end of the Modem is composed of a transceiver energy converter, a power amplifier, a synchronous signal generator and a communication signal generator; the receiving end and the transmitting end share the transceiver energy converter; the receiving end furthermore comprises double pseudo random sequence synchronizers and a DS-MFSK demodulator; and the Modem further comprises functional modules such as an interface circuit. Actual debugging result verifies effectiveness and robustness of the Modem. Considering the aspects such as realization difficulty and cost, the Modem can be effectively applied in actual engineering environment.
Description
Technical field
The utility model relates to the underwater sound communication field, or rather, relate to a kind of grouping multi-user underwater sound communication Modem, be applicable in the underwater sound communication environment higher to traffic rate, that robustness is stronger.
Background technology
In recent years along with the increase of mankind's Activities of Ocean, the fields such as exploration of ocean resources, underwater operation, marine environment detection all to transfer of data with communicate by letter very strong demand, and be to rely on underwater sound communication without the cable information interaction under water, so water sound communication technique becomes study hotspot gradually, and the development of underwater sound communication Modem becomes one of the important goal in this field.
Multicarrier frequency shift keying (MFSK) is a kind of incoherent modulation technique, and it is modulated at parallel transmission the after different carrier with parallel information, can effectively improve the traffic rate of system.Than the coherent modulation/demodulation technology, the MFSK modulator-demodulator does not need to carry out carrier synchronization at receiving terminal, when communicating by letter in the stronger underwater acoustic channel of time variation, can avoid the difficult problem of carrier synchronization difficulty.Simultaneously the MFSK modulation-demodulation technique belongs to broadband system, when transmitting in frequency domain is the underwater acoustic channel of comb filter, can resist multi-path effect from frequency domain.Adopt the MFSK modulation-demodulation technique can greatly simplify the complexity of communication control processor.
Direct sequence spread spectrum skill utilizes the correlation properties of pseudo random sequence, and can effectively reduce noise effect and other users and disturb, so the existing stronger antijamming capability of direct sequence spread spectrum communication system, can steadily and surely work under low signal-to-noise ratio.Can realize code division multiple access based on pseudo random sequence in addition, have in radio communication widely and use.
The utility model in conjunction with direct sequence spread spectrum skill, and has been developed grouping multi-user underwater sound communication Modem based on the MFSK modulation technique on the basis that will both organically combine.
Summary of the invention
Given this, the utility model discloses grouping multi-user underwater sound communication Modem, its transmitting terminal is successively by interface circuit (101), internal control unit (102), DS-MFSK modulator (103), many PN sequence synchronizing signal maker (104), time-delay superimposer (105), power amplifier (106), transmitting-receiving close puts transducer (107) composition; Receiving terminal is closed by transmitting-receiving successively and puts transducer (107), signal conditioner (108), many PN sequence synchronizer (109), DS-MFSK demodulator (110), internal controller (102), interface circuit (101) forms, wherein transmitting terminal and receiving terminal shared interface circuit (101), internal controller (102), transmitting-receiving is closed and is put transducer (107).
the course of work of its transmitting terminal of grouping multi-user underwater sound communication Modem disclosed in the utility model is: obtain waiting message by interface circuit (101) from host computer or memory cell, internal controller (102) is controlled many PN sequence synchronizing signal maker (104) generation synchronizing signal according to default communication pattern and user's group, control DS-MFSK modulator is modulated into waiting message to be waited to signal, time-delay superimposer (105) is sent to power amplifier (106) with synchronizing signal and waiting message signal lag overlay order, power amplifier (106) amplify to drive transmitting-receiving with input signal and closes and put transducer (107) signal amplitude is incident upon in water.
the course of work of its receiving terminal of grouping disclosed in the utility model multi-user underwater sound communication Modem is: at first closed by transmitting-receiving and put transducer (107) and receive in water acoustical signal and be translated into the signal of telecommunication and send into signal conditioner (108), signal conditioner (108) is sent the input signal filter and amplification into many PN sequence synchronizer (109) and DS-MFSK demodulator (110) simultaneously, when many PN sequence synchronizer (109) detection synchronizing signal output frame signal is synchronous, base and Doppler coefficient are to DS-MFSK demodulator (110), the Customs Assigned Number of output communication pattern and discriminating is to internal controller (102), DS-MFSK demodulator (110) carries out demodulation with Doppler coefficient to signal conditioner (108) output signal according to the synchronous time base that many PN sequence synchronizer (109) provides, and the information after demodulation is sent into interface circuit (101).
Grouping multi-user underwater sound communication Modem disclosed in the utility model have realize simple, robustness is higher, can realize the advantage of higher speed underwater sound communication and multi-user communication, specifically:
The first, utilize the synchronous completing user group simultaneously of the quick achieve frame of many pseudo random sequences synchronizer, communication pattern evaluation and Doppler coefficient to estimate.
The second, utilize the DS-MFSK modulator-demodulator can realize the fast demodulation of MFSK signal, can support multi-user communication simultaneously.
This shows, the utility model is novel in design, with high content of technology, be easy to realize and cost lower, being very suitable for exploration of ocean resources, underwater operation, marine environmental monitoring etc. has the engineering in the field of demand to use to underwater sound communication.
Description of drawings
Understand in order to make content of the present utility model be more conducive to the relevant speciality technical staff, the below is briefly described accompanying drawing.
Fig. 1 is grouping multi-user underwater sound communication Modem structured flowchart described in the utility model.
Fig. 2 is grouping multi-user underwater sound communication Modem transmitting terminal circuit structure diagram described in the utility model.
Fig. 3 is grouping multi-user underwater sound communication Modem power amplifier amplifying circuit schematic diagram described in the utility model.
Fig. 4 is that grouping multi-user underwater sound communication Modem receiving signal reason circuit described in the utility model connects block diagram
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and a kind of better specific embodiment of the utility model.
As a kind of preferred embodiment of the present utility model, the working band of selective system is 20～40KHz, band system band is divided into 4, each frequency band all adopts the DS-4FSK modulation system, the PN sequence exponent number of synchronizing signal is determined by the whole system number of users, adopts 7 rank balanceable Gold sequences in this PN sequence.
As a kind of preferred embodiment of the present utility model, transmitting-receiving closes that to put transducer (107) parameter as follows: frequency 20kHz～40kHz, and emission maximum sound source level 190dB, emission maximum voltage is not less than 300V; Electro-acoustic conversion efficiency is not less than 70%, receiving sensitivity-180dB, and dynamic range is not less than 60dB, maximum operating water depth 600m.
As a kind of preferred embodiment of the present utility model, power amplifier (106) adopts D class power amplifier to realize, output drive signal adopts the PWM form simultaneously, and the signal after all quantize can be present in selects emission in FLASH.Circuit connecting form as shown in Figure 2, the pwm signal source is directly produced by FPGA (201), output LVTTL level signal, drive circuit (202) adopts MIC4422 or IR2110 to realize, power amplifier (203) adopts D class amplification circuit, push-pull type structure, the citation form of circuit is shown in Figure 3, and match circuit (204) determines according to transducer parameters.
As a kind of preferred embodiment of the present utility model, many PN sequence synchronizing signal maker (104) adopts 3 PN sequences with many PN sequence synchronizer (109), wherein front two sequences is used for carrying out frame synchronization, the user differentiates and Doppler estimates, the last item sequence communicates the pattern agreement.Many PN sequence synchronizing signal maker (104) produces signal structure as shown in Figure 4.
As a kind of preferred embodiment of the present utility model, DS-MFSK modulator (103) is divided into 4 frequency bands with the whole system bandwidth, each frequency band adopts the 4FSK modulation system, the frequency between adjacent carrier is spaced apart 1250Hz, symbol duration guarantees that the FFT frequency-measurement accuracy is 0.5 times of frequency interval, 1/T=625Hz is arranged, corresponding T=1.6ms this moment.Signal after adopting 7 rank balanceable Gold sequences to the 4FSK modulation carries out scrambling to be processed.Add the blank redundancy of the preceding paragraph and offset the error of code element intercepting after each information code.Drafting blank redundancy at this is 0.4ms.
As a kind of preferred embodiment of the present utility model, the signal initial time that DS-MFSK demodulator (110) provides according to many PN sequence synchronizer is the intercepting message code element successively, at first the code element of intercepting being carried out despreading processes, signal after despreading is done the FFT computing, the spectral window in the intercepting system frequency band range.In spectral window from low-frequency band begin to high frequency band one by one frequency band, frequency carries out soft-decision one by one, realizes the fast demodulation of information.
As a kind of better example of executing of the present utility model, in actual applications, the symbolic number that every frame signal is carried is by internal controller (102) adjustment in good time according to the channel actual conditions, and be 1s the coherence time of general shallow sea channel, drafts frame length in 1s.The duration of each code element is that symbol duration adds that the blank redundancy of 0.4ms is about 2ms.Calculate take frame length as 1s, every frame synchronizing signal 20ms, protection interval 50ms, the protection between consecutive frame is spaced apart 50ms, and the information code element duration is 880ms, and the number of symbols of carrying is 880/2=440.
as a kind of preferred embodiment of the present utility model, signal conditioner (108) is successively by pre-amplification circuit (401), filter circuit (402), controllable gain amplifying circuit (403), automatic amplitude limiter circuit (404), gain controller (405) forms, wherein pre-amplification circuit (401) and filter circuit (402) are realized the multiplication factor of fixed gain, controllable gain amplifying circuit (403), automatic amplitude limiter circuit (404), gain controller (405) realizes that jointly dynamic gain control rises and falls with the time change that adapts to underwater acoustic channel.
As a kind of preferred embodiment of the present utility model; protection interval in protection interval between synchronizing signal and frame signal, synchronizing signal between the PN sequence is mainly determined by the expansion of the maximum effectively time delay of the underwater sound many ways channels: therefore the channel maximum delay expansion of many ways, shallow sea is drafted the frame protection and is spaced apart 50ms generally the magnitude of tens of milliseconds.
as a kind of preferred embodiment of the present utility model, the transmitting terminal workflow is as follows: transmitting terminal obtains waiting message by interface circuit (101) from host computer or memory cell, internal controller (102) is controlled many PN sequence synchronizing signal maker (104) generation synchronizing signal according to default communication pattern and user's group, control DS-MFSK modulator (103) is modulated into waiting message to be waited to signal, time-delay superimposer (105) is sent to power amplifier (106) with synchronizing signal and waiting message signal lag overlay order, power amplifier (106) amplify to drive transmitting-receiving with input signal and closes and put transducer (107) signal amplitude is incident upon in water.
as a kind of preferred embodiment of the present utility model, the receiving terminal workflow is as follows: at first closed by transmitting-receiving and put transducer (107) and receive in water acoustical signal and be translated into the signal of telecommunication and send into signal conditioner (108), signal conditioner (108) is sent the input signal filter and amplification into many PN sequence synchronizer (109) and DS-MFSK demodulator (110) simultaneously, when many PN sequence synchronizer (109) detection synchronizing signal output frame signal is synchronous, base and Doppler coefficient are to DS-MFSK demodulator (110), the Customs Assigned Number of output communication pattern and discriminating is to internal controller (102), DS-MFSK demodulator (110) carries out demodulation with Doppler coefficient to signal conditioner (108) output signal according to the synchronous time base that many PN sequence synchronizer (109) provides, and the information after demodulation is sent into interface circuit (101).
The above is only a kind of better possible embodiments of the present utility model; described embodiment limits scope of patent protection of the present utility model; therefore the equivalent structure done of every utilization specification of the present utility model and accompanying drawing content changes, and in like manner all should be included in the protection range of utility model.
Claims (4)
1. grouping multi-user underwater sound communication Modem, it is characterized in that transmitting terminal is successively by interface circuit (101), internal control unit (102), DS-MFSK modulator (103), many PN sequence synchronizing signal maker (104), time-delay superimposer (105), power amplifier (106), transmitting-receiving is closed and is put transducer (107) composition; Receiving terminal is closed by transmitting-receiving successively and puts transducer (107), signal conditioner (108), and many PN sequence synchronizer (109), DS-MFSK demodulator (110), internal controller (102), interface circuit (101) forms.
2. grouping multi-user underwater sound communication Modem as claimed in claim 1, is characterized in that transmitting terminal and receiving terminal shared interface circuit (101), internal controller (102), and transmitting-receiving is closed and is put transducer (107).
3. grouping multi-user underwater sound communication Modem as claimed in claim 1, it is characterized in that transmitting terminal obtains waiting message by interface circuit (101) from host computer or memory cell, internal controller (102) is controlled many PN sequence synchronizing signal maker (104) generation synchronizing signal according to default communication pattern and user's group, control DS-MFSK modulator (103) is modulated into waiting message to be waited to signal, time-delay superimposer (105) is sent to power amplifier (106) with synchronizing signal and waiting message signal lag overlay order, power amplifier (106) amplify to drive transmitting-receiving with input signal and closes and put transducer (107) signal amplitude is incident upon in water.
4. grouping multi-user underwater sound communication Modem as claimed in claim 1, it is characterized in that receiving terminal is closed by transmitting-receiving puts transducer (107) and receives in water acoustical signal and be translated into the signal of telecommunication and send into signal conditioner (108), signal conditioner (108) is sent the input signal filter and amplification into many PN sequence synchronizer (109) and DS-MFSK demodulator (110) simultaneously, when many PN sequence synchronizer (109) detection synchronizing signal output frame signal is synchronous, base and Doppler coefficient are to DS-MFSK demodulator (110), the Customs Assigned Number of output communication pattern and discriminating is to internal controller (102), DS-MFSK demodulator (110) carries out demodulation with Doppler coefficient to signal conditioner (108) output signal according to the synchronous time base that many PN sequence synchronizer (109) provides, and the information after demodulation is sent into interface circuit (101).
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| CN 201220455277 CN202979011U (en) | 2012-09-10 | 2012-09-10 | Group multiuser underwater acoustic communication Modem |
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| CN 201220455277 CN202979011U (en) | 2012-09-10 | 2012-09-10 | Group multiuser underwater acoustic communication Modem |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501201A (en) * | 2013-09-03 | 2014-01-08 | 华南理工大学 | Frequency hopping pulse bit encoding underwater acoustic communication method based on linear frequency modulation signals |
| CN105406921A (en) * | 2015-10-20 | 2016-03-16 | 中国电子科技集团公司第三研究所 | MFSK water sound communication method and MFSK water sound communication system |
| CN106302298A (en) * | 2016-09-27 | 2017-01-04 | 哈尔滨工程大学 | A kind of method eliminating OFDM underwater sound communication system clipped noise |
| CN112649798A (en) * | 2020-12-31 | 2021-04-13 | 哈尔滨工程大学 | Passive detection method for soft decision of underwater sound target weak line spectrum |
-
2012
- 2012-09-10 CN CN 201220455277 patent/CN202979011U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501201A (en) * | 2013-09-03 | 2014-01-08 | 华南理工大学 | Frequency hopping pulse bit encoding underwater acoustic communication method based on linear frequency modulation signals |
| CN103501201B (en) * | 2013-09-03 | 2016-01-06 | 华南理工大学 | A kind of frequency hopping arteries and veins position based on linear FM signal coding underwater acoustic communication method |
| CN105406921A (en) * | 2015-10-20 | 2016-03-16 | 中国电子科技集团公司第三研究所 | MFSK water sound communication method and MFSK water sound communication system |
| CN106302298A (en) * | 2016-09-27 | 2017-01-04 | 哈尔滨工程大学 | A kind of method eliminating OFDM underwater sound communication system clipped noise |
| CN106302298B (en) * | 2016-09-27 | 2019-09-27 | 哈尔滨工程大学 | A method of eliminating OFDM underwater sound communication system clipped noise |
| CN112649798A (en) * | 2020-12-31 | 2021-04-13 | 哈尔滨工程大学 | Passive detection method for soft decision of underwater sound target weak line spectrum |
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Owner name: BEIJING XINGWANG CETONG TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: BEIJING YINCHUANG TECHNOLOGY CO.,LTD. Effective date: 20150505 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Free format text: CORRECT: ADDRESS; FROM: 100080 HAIDIAN, BEIJING TO: 100176 DAXING, BEIJING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20150505 Address after: Branch of Beijing economic and Technological Development Zone of Beijing City thirteen street 100176 No. 26 Building 1 layer 3 Patentee after: Beijing Star Network Measurement Technology Co., Ltd. Address before: 100080 Haidian District, Suzhou Street, No. 1, No. 815, Beijing Patentee before: Beijing Yinchuang Technology Co.,Ltd. |
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| DD01 | Delivery of document by public notice |
Addressee: Jin Qilin Document name: Notification of Passing Examination on Formalities |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20190910 |
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| CF01 | Termination of patent right due to non-payment of annual fee |