CN109768812A - A kind of underwater sound communication Doppler estimation and synchronous method based on chaotic fm - Google Patents
A kind of underwater sound communication Doppler estimation and synchronous method based on chaotic fm Download PDFInfo
- Publication number
- CN109768812A CN109768812A CN201910094901.4A CN201910094901A CN109768812A CN 109768812 A CN109768812 A CN 109768812A CN 201910094901 A CN201910094901 A CN 201910094901A CN 109768812 A CN109768812 A CN 109768812A
- Authority
- CN
- China
- Prior art keywords
- signal
- chaotic
- convolution
- doppler
- synchronous
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Abstract
The underwater sound communication Doppler estimation and synchronous method that the invention discloses a kind of based on chaotic fm, choose one section of chaotic fm signal, and rule is ranked up as frame synchronizing signal, signal sampling and the effect of chaotic fm signal convolution are received by docking and compared with thresholding, then continue to copy process of convolution less than thresholding, greater than thresholding, then it is synchronous with signal that the spacing and intermediate value for mentioning different peak values are completed at the same time Doppler's estimation.One section of chaotic signal is used only in the present invention and process of convolution completion Doppler's estimation is synchronous with signal, and calculation amount is small, and Project Realization degree is high, is suitble to work under large doppler environment, provides accurate Doppler and synchronous estimation.
Description
Technical field
The invention belongs to field of underwater acoustic communication, and in particular to be completed at the same time Doppler in underwater sound communication based on chaotic fm and estimate
It counts and synchronous method.
Background technique
Underwater sound communication is as underwater unique means of communication, it has also become the emphasis of various countries' research and the height of various countries' urgent need
One of new technology, maximum technological challenge comes from the underwater acoustic channel with the characteristics of random time-dependent, space-variant, frequency becomes, wherein more
Way effect causes intersymbol interference, fluctuation effect to cause the fluctuating of signal, how to inhibit more ways, realizes the stabilization of signal, reliably examines
Survey is the matter of utmost importance to be solved in underwater sound communication.On the other hand, due between transmitter and receiver relative motion and
The effect of seawater flowing and turbulent flow, sound wave can generate certain frequency drift, as Doppler during the dissemination channel of ocean
Frequency displacement, since the spread speed of sound in water is about 1500m/s, doppler interference is big more than what road surface communication came.
Common underwater Doppler estimation is divided into time domain, frequency domain and time-frequency domain method, and time domain is according to the step between observation signal
To judge, frequency domain carries out Doppler's estimation by the frequency variation of insertion simple signal for long variation, respectively have it is excellent lack, how general time domain is
Le usually judges that frequency domain judgment method then requires processing data length, and length is longer, frequency for signal frame as step-length
Rate resolution ratio is bigger, computationally intensive.Synchronous includes external synchronization method and self-synchronizing method, and corresponding unused data frame format and bandwidth are wanted
It asks.The patent (application number 200910021976.6) of He Chengbing et al. is using linear FM signal as synchronization frame, additional use
Acquisition data setting delay is synchronized to be judged with Doppler.The patent (application number 200910100598.0) of Xiong Shengjun et al. is logical
It crosses and adds both ends simple signal in transmitting terminal, receiving end reduces calculation amount using Zoom-FFT and completes Doppler's estimation, not
It completes to synchronize, and there are still the requirements of data frame length.
Chaotic signal is the similar random process of nonlinear dynamic system performance, i.e., no period does not restrain again, to first
Initial value and its sensitivity, as long as assigning different initial values, so that it may generate enough chaos sequences, it is often more important that chaos sequence
Column have splendid orthogonality, stackable between signal and signal.
Summary of the invention
In view of this, the present invention propose it is a kind of based on chaotic fm underwater sound communication Doppler estimation and synchronous method, gram
It is big to take above-mentioned calculating step, Doppler's estimation and synchronous defect cannot be completed at the same time.
Mechanism of the invention: using the orthogonality of chaos sequence, being alternatively arranged using the same chaos sequence, and second mixed
Ignorant sequence adds the conjugation overturning sequence of itself, constitutes synchronous head, only completes Doppler's estimation with chaos sequence copy convolution
With it is synchronous.
Underwater sound communication Doppler estimation and synchronous method based on chaotic fm, the specific steps are as follows:
(1) chaotic signal that length is D is generated according to Chebyshev's chaos sequence formula, two identical chaotic signals
Time interval is D, the conjugation energizing signal of existing chaotic signal is added on the latter chaos sequence, as frame synchronizing signal；
(2) reception signal is sampled, sample rate is 4~6 times of signal of communication highest frequency；It is done to signal r is received
The copy convolution of chaotic signal, and calculate the absolute value peak of convolution function result | C |；
(3) | C | compared with a setting thresholding, if being less than thresholding, return step (2) continues convolution；If more than door
Limit, then judgement has synchronization signal arrival, obtains thick synchronous；
(4) observation interval for doubling process of convolution carries out chaotic signal inverted signal to reception signal r respectively and copies
The copy convolution of shellfish convolution sum chaotic signal, the C obtained respectively1, C2And C3Three peak points calculate Doppler factorTime synchronization point
Detailed description of the invention
Fig. 1 is data frame structure schematic diagram of the chaotic signal as frame synchronizing signal；
Fig. 2 is the conjugation overturning chaos sequence copy convolution result schematic diagram under Doppler and time delay condition；
Fig. 3 is that chaos sequence copies convolution result schematic diagram under Doppler and time delay condition；
Fig. 4 is Doppler of the invention and synchronous estimation implementation flow chart.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
In the present invention, frame synchronizing signal uses chaotic signal s (t), can be indicated with formula (1):
sn+1=cos (q*arccos (sn)), -1≤Xn≤1 (1)
Wherein s (t) is the initial value of chaotic signal, signal length D, s (t)*For the conjugation energizing signal of s (t), joint
Sigtnal interval D forms frame synchronizing signal, may be expressed as:
Since the relative motion between underwater sound communication transceiver may be expressed as: after signal is propagated by underwater acoustic channel
R (t)=p ((1+ Δ) t+d) (3)
Δ is Doppler factor in formula, and d is that signal reaches the time used.
It takes and receives signal r (t) and chaotic signal conjugation overturning s (t)*Copy convolution is done according to formula (4), and takes peak value | C
| compared with setting thresholding, if being less than thresholding, return continues convolution；If more than thresholding, then judgement has synchronization signal to arrive
It reaches, obtains and slightly synchronize, take the reception signal r (t) of 2 times of length.
The observation interval of process of convolution extended carries out chaotic signal inverted signal to signal r (t) is received respectively
Copy convolution sum chaotic signal copy convolution, the C obtained respectively1, C2And C3Three peak points calculate Doppler factorTime synchronization starting pointIn addition to the implementation, all to use equivalent replacement or equivalent change
The technical solution to be formed is changed, is fallen within the scope of protection required by the present invention.
Claims (3)
1. a kind of underwater sound communication Doppler estimation and synchronous method based on chaotic fm, it is characterised in that include the following steps:
(1) chaotic signal that length is D, the time of two identical chaotic signals are generated according to Chebyshev's chaos sequence formula
Between be divided into D, the conjugation energizing signal of existing chaotic signal is added on the latter chaos sequence, as frame synchronizing signal；
(2) reception signal is sampled, sample rate is 4~6 times of signal of communication highest frequency；Chaos is done to signal r is received
The copy convolution of signal, and calculate the absolute value peak of convolution function result | C |；
(3) | C | compared with a setting thresholding, if being less than thresholding, return step (2) continues convolution；If more than thresholding, then
Judgement has synchronization signal arrival, obtains thick synchronous；
(4) observation interval for doubling process of convolution carries out the copy volume of chaotic signal inverted signal to reception signal r respectively
Long-pending and chaotic signal copy convolution, the C obtained respectively1, C2And C3Three peak points calculate Doppler factor
Time synchronization point
2. the underwater sound communication Doppler estimation based on chaotic fm and synchronous method as described in claim 1, it is characterised in that:
Frame synchronizing signal described in step (1) uses chaotic signal s (t), is indicated with formula (1):
sn+1=cos (q*arccos (sn)), -1≤Xn≤1 (1)
Wherein s (t) is the initial value of chaotic signal, signal length D, s (t)*For the conjugation energizing signal of s (t), allied signal
Interval D forms frame synchronizing signal, may be expressed as:
Since the relative motion between underwater sound communication transceiver may be expressed as: after signal is propagated by underwater acoustic channel
R (t)=p ((1+ Δ) t+d) (3)
Δ is Doppler factor in formula, and d is that signal reaches the time used.
3. the underwater sound communication Doppler estimation based on chaotic fm and synchronous method as described in claim 1, it is characterised in that:
It is taken in step (2) and receives signal r (t) and chaotic signal conjugation overturning s (t)*Copy convolution is done according to formula (4)；
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910094901.4A CN109768812B (en) | 2019-01-30 | 2019-01-30 | Underwater acoustic communication Doppler estimation and synchronization method based on chaotic frequency modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910094901.4A CN109768812B (en) | 2019-01-30 | 2019-01-30 | Underwater acoustic communication Doppler estimation and synchronization method based on chaotic frequency modulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109768812A true CN109768812A (en) | 2019-05-17 |
| CN109768812B CN109768812B (en) | 2020-12-22 |
Family
ID=66454500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910094901.4A Active CN109768812B (en) | 2019-01-30 | 2019-01-30 | Underwater acoustic communication Doppler estimation and synchronization method based on chaotic frequency modulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109768812B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865363A (en) * | 2020-07-13 | 2020-10-30 | 南京理工大学 | High-dynamic code capture method based on conjugate frequency modulation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6512720B1 (en) * | 2002-05-14 | 2003-01-28 | The United States Of America As Represented By The Secretary Of The Navy | Underwater telemetry method using doppler compensation |
| CN101594185A (en) * | 2009-04-10 | 2009-12-02 | 西北工业大学 | The Doppler of mobile water sound communication signal estimates and method for synchronous |
| CN103684521A (en) * | 2013-12-20 | 2014-03-26 | 中国船舶重工集团公司第七一五研究所 | Fast and accurate synchronization method for spread spectrum underwater acoustic communication |
| CN107231176A (en) * | 2017-07-24 | 2017-10-03 | 哈尔滨工程大学 | A kind of OFDM MFSK underwater sound communications broadband Doppler shift method based on subcarrier energy |
| CN107911133A (en) * | 2017-11-17 | 2018-04-13 | 厦门大学 | The Doppler factor estimation and compensation method of a kind of mobile underwater sound communication |
| CN108243138A (en) * | 2018-01-11 | 2018-07-03 | 福建星海通信科技有限公司 | A kind of combination Doppler estimation suitable for underwater sound communication system |
-
2019
- 2019-01-30 CN CN201910094901.4A patent/CN109768812B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6512720B1 (en) * | 2002-05-14 | 2003-01-28 | The United States Of America As Represented By The Secretary Of The Navy | Underwater telemetry method using doppler compensation |
| CN101594185A (en) * | 2009-04-10 | 2009-12-02 | 西北工业大学 | The Doppler of mobile water sound communication signal estimates and method for synchronous |
| CN103684521A (en) * | 2013-12-20 | 2014-03-26 | 中国船舶重工集团公司第七一五研究所 | Fast and accurate synchronization method for spread spectrum underwater acoustic communication |
| CN107231176A (en) * | 2017-07-24 | 2017-10-03 | 哈尔滨工程大学 | A kind of OFDM MFSK underwater sound communications broadband Doppler shift method based on subcarrier energy |
| CN107911133A (en) * | 2017-11-17 | 2018-04-13 | 厦门大学 | The Doppler factor estimation and compensation method of a kind of mobile underwater sound communication |
| CN108243138A (en) * | 2018-01-11 | 2018-07-03 | 福建星海通信科技有限公司 | A kind of combination Doppler estimation suitable for underwater sound communication system |
Non-Patent Citations (1)
| Title |
|---|
| 申晓红等: "水声混沌跳频通信的多普勒频移估计及补偿方法研究", 《探测与控制学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865363A (en) * | 2020-07-13 | 2020-10-30 | 南京理工大学 | High-dynamic code capture method based on conjugate frequency modulation |
| CN111865363B (en) * | 2020-07-13 | 2022-04-19 | 南京理工大学 | High-dynamic code capture method based on conjugate frequency modulation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109768812B (en) | 2020-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107911133A (en) | The Doppler factor estimation and compensation method of a kind of mobile underwater sound communication | |
| Wang et al. | Doppler estimation and timing synchronization of underwater acoustic communication based on hyperbolic frequency modulation signal | |
| CN113259291B (en) | Phase compensation method realized by dynamic Doppler tracking of underwater sound continuous signals | |
| CN104753638B (en) | A kind of chaos spread spectrum underwater acoustic communication method | |
| JP4383949B2 (en) | Method and apparatus for generating synchronization pulses and receiver comprising the apparatus | |
| CN1283059C (en) | Method and equipment for carrier frequency synchronization | |
| CN109768812A (en) | A kind of underwater sound communication Doppler estimation and synchronous method based on chaotic fm | |
| Yuan et al. | STLFM signal based adaptive synchronization for underwater acoustic communications | |
| CN106546817A (en) | A kind of Frequency Estimation with feedback function and energy state postulate | |
| Ma et al. | A combined doppler scale estimation scheme for underwater acoustic OFDM system | |
| CN106789791B (en) | Mobile communication system carrier frequency bias estimation based on conjugation symmetric training sequence | |
| JP2955576B1 (en) | Digital communication system, transmitter and receiver thereof, and frame synchronization detection circuit | |
| CN107911328B (en) | Frame synchronization judging device and judging method | |
| CN103529429A (en) | Pulse compression method for field of linear frequency modulation signals | |
| CN104796370A (en) | Signal synchronization method and system for underwater acoustic communication and underwater acoustic communication system | |
| Kim et al. | HFM design for timing synchronization in underwater communications systems | |
| Vilaipornsawai et al. | Underwater communications for moving source using geometry-adapted time reversal and DFE: UAN10 data | |
| CN110430156A (en) | The frame synchornization method and system of the OFDM data that happens suddenly transmission | |
| CN109714112A (en) | A kind of underwater acoustic communication method and system using mobile platform cluster | |
| CN1192508C (en) | Device for ideal synchronization of code signals | |
| CN101615922A (en) | A kind of downlink synchronization tracking method and device | |
| WO2006067680A1 (en) | Method and apparatus for estimating doppler spread | |
| CN101184077A (en) | Doppler frequency deviation obtaining method and apparatus | |
| CN114500206A (en) | GMSK burst communication system-oriented rapid acquisition and synchronization method | |
| CN108924073B (en) | A kind of quick self-adapted Doppler estimation synchronous based on pseudo-random sequence |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211029 Address after: 310030 Room 302, building 1, Jihong Shidai commercial building, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Quanxin Technology Co.,Ltd. Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University |