CN106571877B - Concealment improvement hop group communication coding method using whale cry pulses - Google Patents
Concealment improvement hop group communication coding method using whale cry pulses Download PDFInfo
- Publication number
- CN106571877B CN106571877B CN201610964876.7A CN201610964876A CN106571877B CN 106571877 B CN106571877 B CN 106571877B CN 201610964876 A CN201610964876 A CN 201610964876A CN 106571877 B CN106571877 B CN 106571877B
- Authority
- CN
- China
- Prior art keywords
- information
- group
- communication
- correlation
- hop
- 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.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
The invention belongs to the field of communication, and aims to improve the disguising and hiding performance of underwater communication. The technical scheme adopted by the invention is that a group hopping communication coding method is improved by utilizing the concealment of whale sound pulses, communication information is carried by M communication packets from a1 st group to an Mth group, and each communication packet consists of 1 group hopping handshake frame and N information frames; each hop-group handshake frame consists of a synchronization code and a plurality of information codes; the synchronization code and each information code in each hop-group handshake frame and the information codes have small cross correlation, and the synchronization code and each information code have good autocorrelation and large Doppler tolerance; furthermore, each group-hopping handshake frame is used for notifying a communication information receiving end of a group-hopping rule of the next N groups of information frames, so as to realize handshake of communication information decoding; communication information is transferred by time interval coding, namely delay difference coding, between symbols. The invention is mainly applied to underwater communication.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to a method for improving jump group communication coding by utilizing the concealment of whale sound pulses.
Background
In an underwater communication system, underwater camouflage and covert communication can be realized by using the sound pulse of whales, and in order to further improve the camouflage capacity, the emission rule of the communication pulse is close to that of the whales as much as possible.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for improving the communication coding of a jump group by utilizing the concealment of whale sound pulses and improve the camouflage concealment of underwater communication. The technical scheme adopted by the invention is that a group hopping communication coding method is improved by utilizing the concealment of whale sound pulses, communication information is carried by M communication packets from a1 st group to an Mth group, and each communication packet consists of 1 group hopping handshake frame and N information frames; each hop-group handshake frame consists of a synchronization code and a plurality of information codes; the synchronization code and each information code in each hop-group handshake frame and the information codes have small cross correlation, and the synchronization code and each information code have good autocorrelation and large Doppler tolerance; furthermore, each group-hopping handshake frame is used for notifying a communication information receiving end of a group-hopping rule of the next N groups of information frames, so as to realize handshake of communication information decoding; the communication information is transmitted between the synchronous code and the information code in each information frame through time interval coding between code elements, namely time delay difference coding.
Furthermore, the number of the information codes in each hop-group handshake frame and the number of the information codes in other hop-group handshake frames can be set to be the same according to application requirements, or can be set to be different according to application requirements; further, the number of the information codes in each group of information frames and the number of the information codes in other information frames may be set to be the same according to application requirements, or may be set to be different according to application requirements.
Furthermore, each information code and each synchronization code are composed of a single whale sound pulse; a single whale sound pulse refers to the effective whale sound extracted from the train of whale sound pulses through a rectangular pulse filter.
Furthermore, the whale sound pulses comprise sound pulses of various whales in the sea, and during the communication coding process, the sound pulses of one type of whale can be used, the sound pulses of multiple types of whales can be used, or the sound pulses of multiple types of whales can be picked up and then mixed coding is performed.
Further, by utilizing cross-correlation, autocorrelation and Doppler tolerance calculation formulas, solving correlation values among the sound pulses in a one-by-one traversal mode, screening out M groups of pulse combinations with small cross-correlation, good self-autocorrelation and large Doppler tolerance and respectively taking the M groups of pulse combinations as hop-group handshake frames; meanwhile, N groups of pulse combinations with small mutual correlation, good self-correlation and large Doppler tolerance are screened out and respectively used as information frames.
In one example, the normalized cross-correlation is less than 0.3, the normalized auto-correlation is greater than 0.8, and the temporal resolution is higher than 5m and the doppler margin is greater than 3 m/s.
The invention has the characteristics and beneficial effects that:
the method for improving the group jump communication coding by utilizing the concealment of whale sound pulses is provided, and the camouflage concealment of underwater communication can be improved.
Description of the drawings:
fig. 1 shows an encoding structure of the encoding method described in the present invention.
FIG. 2 shows a train of whale vocals and a schematic diagram of vocals extraction.
Fig. 3 shows a specific example of the coding structure of the coding method described in the present invention.
Detailed Description
The invention provides a method for improving group jump communication coding by utilizing the concealment of whale sound pulses, which divides original whale sound into a plurality of groups, and then transmits the grouped communication pulses according to a certain group jump rule, so that the transmission rule of the communication pulses is closer to that of whales, and the concealment of communication is further improved.
In order to overcome the defects of the prior art, the invention provides a method for improving the group hopping communication coding by using the concealment of whale sound pulses.
The invention utilizes original whale calling and combines a hop group communication method to improve the disguised and hidden property of communication.
The invention adopts the technical scheme that a method for improving skip group communication coding by utilizing the concealment of whale sound pulses comprises the following implementation processes:
as shown in fig. 1, the group hopping communication encoding method includes that communication information is carried by a1 st group of communication packets, …, wherein the M th group of communication packets is totally M communication packets, and each communication packet is composed of 1 group hopping handshake frame and N information frames;
furthermore, each hop-group handshake frame consists of a synchronization code and a plurality of information codes; the synchronization code and each information code in each hop-group handshake frame and the information codes have small cross correlation, and the synchronization code and each information code have good autocorrelation and large Doppler tolerance; furthermore, each group-hopping handshake frame is used for notifying a communication information receiving end of a group-hopping rule of the next N groups of information frames, so as to realize handshake of communication information decoding;
furthermore, each group of information frames consists of a synchronous code and a plurality of information codes; the synchronous codes in each information frame and each information code as well as the information codes have small cross correlation, and simultaneously, the synchronous codes and each information code have good autocorrelation and large Doppler tolerance; further, the transmission of communication information is realized between the synchronization code and the information code in each information frame through time interval coding between code elements, namely time delay difference coding;
furthermore, the number of the information codes in each hop-group handshake frame and the number of the information codes in other hop-group handshake frames can be set to be the same according to application requirements, or can be set to be different according to application requirements;
further, the number of the information codes in each group of information frames and the number of the information codes in other information frames can be set to be the same according to application requirements or can be set to be different according to application requirements;
furthermore, each information code and each synchronization code are composed of a single whale sound pulse;
further, a single whale sound pulse refers to an effective whale sound picked from a whale sound pulse sequence through a rectangular pulse filter, as shown in fig. 2, the effective part of the whale sound is picked through the rectangular pulse to filter a noise part, and thus the whale sound pulse is obtained;
further, by utilizing cross-correlation, autocorrelation and Doppler tolerance calculation formulas, solving correlation values among the sound pulses in a one-by-one traversal mode, screening out M groups of pulse combinations with small cross-correlation, good self-autocorrelation and large Doppler tolerance and respectively taking the M groups of pulse combinations as hop-group handshake frames; meanwhile, screening out N groups of pulse combinations which have small mutual cross correlation (for example, the normalized cross correlation is less than 0.3), good self-correlation (for example, the normalized self-correlation is more than 0.8, the time resolution is high, for example, more than 5m) and large Doppler tolerance (for example, the Doppler tolerance is more than 3m/s) as information frames respectively;
furthermore, the whale sound pulses comprise sound pulses of various whales in the sea, and during the communication coding process, the sound pulses of one type of whale can be used, the sound pulses of multiple types of whales can be used, or the sound pulses of multiple types of whales can be picked up and then mixed coding is performed.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the group hopping communication encoding method includes that communication information is carried by a1 st group of communication packets, …, wherein the M th group of communication packets is totally M communication packets, and each communication packet is composed of 1 group hopping handshake frame and N information frames;
furthermore, each hop-group handshake frame consists of a synchronization code and a plurality of information codes; the synchronization code and each information code in each hop-group handshake frame and the information codes have small cross correlation, and the synchronization code and each information code have good autocorrelation and large Doppler tolerance; furthermore, each group-hopping handshake frame is used for notifying a communication information receiving end of a group-hopping rule of the next N groups of information frames, so as to realize handshake of communication information decoding;
furthermore, each group of information frames consists of a synchronous code and a plurality of information codes; the synchronous codes in each information frame and each information code as well as the information codes have small cross correlation, and simultaneously, the synchronous codes and each information code have good autocorrelation and large Doppler tolerance; further, the transmission of communication information is realized between the synchronization code and the information code in each information frame through time interval coding between code elements, namely time delay difference coding;
furthermore, the number of the information codes in each hop-group handshake frame and the number of the information codes in other hop-group handshake frames can be set to be the same according to application needs, or can be set to be different according to application needs;
further, the number of the information codes in each group of information frames and the number of the information codes in other information frames can be set to be the same according to application requirements or can be set to be different according to application requirements;
furthermore, each information code and each synchronization code are composed of a single whale sound pulse;
further, a single whale sound pulse refers to an effective whale sound picked from a whale sound pulse sequence through a rectangular pulse filter, as shown in fig. 2, the effective part of the whale sound is picked through the rectangular pulse to filter a noise part, and thus the whale sound pulse is obtained;
further, by utilizing cross-correlation, autocorrelation and Doppler tolerance calculation formulas, solving correlation values among the sound pulses in a one-by-one traversal mode, screening out M groups of pulse combinations with small cross-correlation, good self-autocorrelation and large Doppler tolerance and respectively taking the M groups of pulse combinations as hop-group handshake frames; meanwhile, screening out N groups of pulse combinations with small mutual correlation, good self-correlation and large Doppler tolerance as information frames respectively;
furthermore, the whale sound pulses comprise sound pulses of various whales in the sea, and in the process of communication coding, one type of whale sound pulse can be used, multiple types of whale sound pulses can be used, or multiple types of whale sound pulses can be picked up and then mixed coding is carried out;
further, for the sake of clarity, the present invention provides a specific example, that is, it is assumed that M is 2, N is 3, the number of information codes in the 1 st and 2 nd hop-group handshake frames in fig. 2 is 4, the number of information codes in the a1 th group information frame is 5, the number of information codes in the a2 th group information frame is 7, and the number of information codes in the a3 th group information frame is 10; as can be seen from fig. 3, the hop group rule of the 1 st group communication packet is a1 → a2 → a3, and the hop group rule of the 2 nd group communication packet is a3 → a1 → a 2;
further, assuming that the number of picked-out whale acoustic pulses is 100, then, performing cross-correlation, auto-correlation and Doppler tolerance calculation on any two acoustic pulses, and screening out 5 total synchronous codes and 4 information codes in the 1 st hop-group handshake frame, wherein the synchronous codes and the 4 information codes can meet the condition of small cross-correlation, and each acoustic pulse can also meet the requirements of small auto-correlation and large Doppler tolerance;
further, from 100-5 to 95 ping pulses, through performing cross correlation, auto correlation and doppler tolerance calculation on any two ping pulses, 5 synchronization codes and 4 information codes in the 2 nd hop-group handshake frame are screened out, and not only can the conditions of small cross correlation among the synchronization codes and 4 information codes meet the requirements of small auto correlation and large doppler tolerance of each ping pulse;
further, from 100-5-5 to 90 ping pulses, 6 synchronization codes and 5 information codes in the a1 th group of information frames are screened out by performing cross correlation, auto correlation and Doppler tolerance calculation on any two ping pulses, and not only can the requirements of small cross correlation among the synchronization codes and the 5 information codes be met, but also each ping pulse can meet the requirements of small auto correlation and large Doppler tolerance;
further, from 100-5-5-6 to 84 ping, 8 synchronization codes and 7 information codes in the a2 th group of information frames are screened out by performing cross correlation, auto correlation and doppler margin calculation on any two ping, and not only can the requirements of small cross correlation between the synchronization codes and the 7 information codes be met, but also each ping can meet the requirements of small auto correlation and large doppler margin;
further, from 100-5-5-6-8 ═ 74 ping, through carrying on cross correlation, autocorrelation and Doppler tolerance calculation to arbitrary two ping, screen out 1 synchronous code and 10 information codes in a3 group information frame total 11, and they can not only meet the condition that the mutual cross correlation is small, but also each ping can meet the requirement that autocorrelation is small, Doppler tolerance is large;
note that: in the above example, the present invention assumes that the group-hop handshake frames and information frames meeting the requirements can be screened out from 100 ping pulses, and if not, the number of 100 ping pulses can be increased until the group-hop handshake frames and information frames meeting the requirements can be screened out.
Claims (3)
1. A method for improving group hopping communication coding by utilizing concealment of whale sound pulses is characterized in that communication information is carried by a1 st group to an Mth group of M communication packets in total, and each communication packet consists of 1 group hopping handshake frame and N information frames; each hop-group handshake frame consists of a synchronization code and a plurality of information codes; the cross correlation between the synchronization code and each information code in each hop-group handshake frame and between every two information codes after normalization is less than 0.3, meanwhile, the autocorrelation of the synchronization code and each information code after normalization is more than 0.8, and the Doppler tolerance is more than 3 m/s; each hop-group handshake frame is used for informing a communication information receiving end of the hop-group rule of the next N groups of information frames so as to realize handshake of communication information decoding; the transmission of communication information is realized between the synchronous code and the information code in each information frame through time interval coding between code elements, namely time delay difference coding; each information code and each synchronization code are composed of a single whale sound pulse; the single whale sound pulse is effective whale sound picked from a whale sound pulse sequence through a rectangular pulse filter, correlation values among the sound pulses are solved in a one-by-one traversal mode by utilizing cross-correlation, autocorrelation and Doppler tolerance calculation formulas, M groups of pulse combinations with small cross-correlation, good self-correlation and large Doppler tolerance are screened out and are respectively used as hop group handshake frames; meanwhile, N groups of pulse combinations with small mutual correlation, good self-correlation and large Doppler tolerance are screened out and respectively used as information frames, wherein the small mutual correlation, the good self-correlation and the large Doppler tolerance respectively mean that the mutual correlation is less than 0.3, the self-correlation is more than 0.8 and the Doppler tolerance is more than 3 m/s.
2. The covertness hop-group communication coding method using whale call sound pulses as claimed in claim 1, wherein the number of information codes in each hop-group handshake frame and the number of information codes in other hop-group handshake frames can be set to be the same or different according to application requirements; the number of the information codes in each group of information frames and the number of the information codes in other information frames can be set to be the same according to application requirements or can be set to be different according to application requirements.
3. The method as claimed in claim 1, wherein the whale sound pulse includes sound pulses of different whales in the sea, and during the communication coding, the sound pulses of one whale or different whales can be used, and after the sound pulses of different whales are picked up, the mixed coding is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610964876.7A CN106571877B (en) | 2016-11-04 | 2016-11-04 | Concealment improvement hop group communication coding method using whale cry pulses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610964876.7A CN106571877B (en) | 2016-11-04 | 2016-11-04 | Concealment improvement hop group communication coding method using whale cry pulses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106571877A CN106571877A (en) | 2017-04-19 |
| CN106571877B true CN106571877B (en) | 2020-07-24 |
Family
ID=58536060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610964876.7A Active CN106571877B (en) | 2016-11-04 | 2016-11-04 | Concealment improvement hop group communication coding method using whale cry pulses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106571877B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199783A (en) * | 2018-01-09 | 2018-06-22 | 天津大学 | The coding method of covert communications is carried out using whale cry harmonic energy |
| CN108880698B (en) * | 2018-06-06 | 2023-06-06 | 天津大学 | Communication method and device based on whale sound pulse time length |
| CN110247714B (en) * | 2019-05-16 | 2021-06-04 | 天津大学 | Bionic hidden underwater acoustic communication coding method and device integrating camouflage and encryption |
| CN110545124B (en) * | 2019-08-09 | 2021-07-27 | 天津大学 | False-proof hidden communication structure and method based on cricket cry |
| CN116132234B (en) * | 2023-01-09 | 2024-03-12 | 天津大学 | Underwater hidden communication method and device using whale animal whistle phase code |
| CN117174109B (en) * | 2023-11-03 | 2024-02-02 | 青岛科技大学 | Feature extraction-based marine mammal sound signal imitation hidden scoring method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3116881B2 (en) * | 1997-11-12 | 2000-12-11 | 日本電気株式会社 | Underwater acoustic data communication method |
| CN100448189C (en) * | 2005-07-19 | 2008-12-31 | 中国船舶重工集团公司第七一五研究所 | Precise frame synchronizing method in hydroacoustic communication |
| CN102195763B (en) * | 2011-05-10 | 2013-05-08 | 东南大学 | Method for realizing MAC (Media Access Control) protocol under long delay condition of underwater sound sensor network |
| CN105307139B (en) * | 2014-07-31 | 2019-02-26 | 中国电信股份有限公司 | A kind of method, mobile terminal and the system of transmission application heartbeat signal |
| CN104486006A (en) * | 2014-12-02 | 2015-04-01 | 天津大学 | Method and device for carrying out camouflaged covert underwater communication by utilizing whale sound |
-
2016
- 2016-11-04 CN CN201610964876.7A patent/CN106571877B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106571877A (en) | 2017-04-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106571877B (en) | Concealment improvement hop group communication coding method using whale cry pulses | |
| DE10012284B4 (en) | Pilot signals for synchronization and / or channel estimation | |
| Jia-jia et al. | Bio-inspired steganography for secure underwater acoustic communications | |
| CN1448014A (en) | Method, transmitter and receiver for spread-spectrum digital communication by golay complementary sequence modulation | |
| CN101753201B (en) | Method for synchronizing data chains of high-speed frequency-hopping unmanned air vehicle | |
| CN105338636B (en) | The method and apparatus for determining the transmission running time-frequency resource of business datum | |
| CN104022796B (en) | A kind of frequency hop sequences production method based on discontinuous frequency range and structure | |
| CN105044727B (en) | The Sonar Signal waveform construction method hidden under water called using sperm whale | |
| CN104765773A (en) | Multi-account network news commentary time based covert communication method | |
| CN104486006A (en) | Method and device for carrying out camouflaged covert underwater communication by utilizing whale sound | |
| CN110545124B (en) | False-proof hidden communication structure and method based on cricket cry | |
| CN110247714B (en) | Bionic hidden underwater acoustic communication coding method and device integrating camouflage and encryption | |
| CN104104690B (en) | The Image Hiding communicated based on mimo channel | |
| CN110381074B (en) | Distributed attack defense method aiming at DHCP framework based on big data | |
| CN1049312C (en) | Spread spectrum address coding technique | |
| CN105023577B (en) | Mixed audio processing method, device and system | |
| CN107197532A (en) | Access processing method and device | |
| CN105049079A (en) | Spreading code synchronization method based on square correlation | |
| CN108279418A (en) | Utilize the combined detection and communication device and method of whale sound | |
| CN107592676B (en) | Data generation method and device, transmitter and terminal | |
| CN104917544B (en) | A kind of scrambler system of selection and device | |
| RU2019141342A (en) | METHOD FOR INCREASING IMMUNITY OF SYNCHRONIZATION SIGNALS | |
| Maksymov et al. | New composite Barker codes, Gold codes and Kasamisequences in broadband signal synchronization systems | |
| CN105071832A (en) | High-speed frequency hopping synchronization method which does not rely on external clock reference | |
| DE102015217954B4 (en) | Method for transmitting data |
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 |