CN105785345A - Active sonar waveform screening device based on wideband ambiguity function and marine biological sound - Google Patents
Active sonar waveform screening device based on wideband ambiguity function and marine biological sound Download PDFInfo
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- CN105785345A CN105785345A CN201610286785.2A CN201610286785A CN105785345A CN 105785345 A CN105785345 A CN 105785345A CN 201610286785 A CN201610286785 A CN 201610286785A CN 105785345 A CN105785345 A CN 105785345A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52001—Auxiliary means for detecting or identifying sonar signals or the like, e.g. sonar jamming signals
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- Radar, Positioning & Navigation (AREA)
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- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention belongs to the field of underwater acoustic detection, and aims at realizing that (1) original marine biological pulses or combined pulses are utilized to act as transmitting signal waveforms of active sonar so as to enhance concealment; and (2) the active sonar signal waveforms of excellent performance are selected through screening and detection performance can be enhanced. The adopted technical scheme is an active sonar waveform screening device based on a wideband ambiguity function and marine biological sound. The active sonar waveform screening device comprises a marine biological sound database storage device which is used for storing original sound generated by various marine organisms, including crying of killer whales, dolphins and sea lions; a sound interceptor; a pulse combiner; a wideband ambiguity function arithmetic unit which utilizes a formula (which is expressed in the specification) to perform ambiguity function operation on the pulses transmitted by a signal type discriminator; a rate resolution screening device; a hidden pulse library; and a range resolution screening device. The active sonar waveform screening device based on the wideband ambiguity function and marine biological sound is mainly applied to the occasion of underwater acoustic detection.
Description
Technical field
The invention belongs to underwateracoustic field of detecting, be based particularly on the active sonar waveform screening washer of Wideband ambiguity function and marine organisms sound.
Background technology
Marine organisms, such as killer whale, dolphin, sea lion etc., meeting constantly launch high-octane pulse signal in water, and these pulse signals are generally trapped Sonar system and filter out as marine biological noise.True based on this, if active sonar detection system can use original pulse signal that marine organisms send as active sonar waveform, the effect of hidden detection will can be played, thus reaching to improve the concealed ability of active sonar system self.
Further, the pulse signal major part that marine organisms send broadly falls into broadband signal, it is therefore desirable to is defined as criterion with the ambiguity function of broadband signal and carrys out the sonar signals waveform that screenability is excellent, to realize the hidden of active sonar and high-performance detection.
Summary of the invention
For overcoming the deficiencies in the prior art, it is contemplated that:
(1) utilize original marine organisms pulse or assembled pulse as the transmitting signal waveform of active sonar, improve it disguised；
(2) filter out the sonar signals waveform of function admirable, improve the performance of detection.
The technical solution used in the present invention is, based on the active sonar waveform screening washer of Wideband ambiguity function and marine organisms sound, including:
Marine organisms sound archival memory, for storing the original sound that various marine organisms send, including killer whale, dolphin, sea lion cry；
Sound interceptor, utilizes rectangular window variable for time span T that the biological sound data from marine organisms sound archival memory are intercepted, and forms ping and is sent to pulse combined device；
Pulse combined device；For single ping is conveyed directly to signal type arbiter；Or it is combined forming train of pulse by multiple pings, then train of pulse is sent to signal type arbiter；
The signal type arbiter pulse to receiving or assembled pulse string carry out spectrum analysis, according to the result of spectrum analysis signal are divided into narrow band signal and broadband signal, and broadband signal is sent to Wideband ambiguity function arithmetical unit；
Wideband ambiguity function utilizes formula arithmetical unitThe pulse that signal type arbiter is sent carries out ambiguity function computing, and ambiguity function operation result is sent to speed resoluting force screening washer；Wherein, τ represents time delay, and η=(1+v/c)/(1-v/c) represents Doppler's scale factor, and s (t) represents the signal waveform of marine organisms ping, the propagation rate of c representation signal, v represents the radial motion speed of active sonar system and detection target；
Ambiguity function is screened by speed resolving power screening washer according to the speed resoluting force threshold value Vn set, if ambiguity function meets threshold requirement, then ambiguity function operation result is resent to range resolution screening washer；
Ambiguity function is screened by range resolution screening washer according to the range resolution threshold value Rn set, if ambiguity function meets threshold requirement, then ambiguity function operation result is resent to hidden pulse storehouse；
Pulse or train of pulse that the ambiguity function of the satisfied requirement that range resolution screening washer is sent by hidden pulse storehouse is corresponding store, and form hidden pulse storehouse.
The feature of the present invention and providing the benefit that:
(1) utilize original marine organisms pulse or assembled pulse as the transmitting signal waveform of active sonar, improve it disguised；
(2) time window that time scale can be altered as desired is utilized to intercept biological acoustical signal, form ping, based on broadband signal ambiguity function criterion, single ping or the assembled pulse that is combined into by multiple pings are asked for ambiguity function, according to the threshold condition set, such as range resolution and speed resoluting force etc., filter out the sonar signals waveform of function admirable, improve the performance of detection.
Accompanying drawing illustrates:
What Fig. 1 illustrated heretofore described method realizes process.
In Fig. 1: 1 is marine organisms sound data bases；2 is sound interceptor；3 is pulse combined device；4 is signal type arbiter；5 is Wideband ambiguity function arithmetical unit；6 is speed resoluting force screening washer；7 is range resolution screening washer；8 is hidden pulse storehouse.
Detailed description of the invention
The present invention, on the one hand, utilize marine organisms sound as sonar signals waveform, improve the disguise of active sonar detection system；On the other hand, the time window that time scale can be altered as desired is utilized to intercept biological acoustical signal, form ping, based on broadband signal ambiguity function criterion, single ping or the assembled pulse that is combined into by multiple pings are asked for ambiguity function, according to the threshold condition set, such as range resolution and speed resoluting force etc., filter out the sonar signals waveform of function admirable, improve the performance of detection.
For overcoming the deficiencies in the prior art, the present invention provides a kind of active sonar waveform screening technique based on Wideband ambiguity function and marine organisms sound.
Present invention have the advantage that (1) utilizes original marine organisms pulse or assembled pulse as the transmitting signal waveform of active sonar, sonar signals waveform is pretended, improve it disguised；(2) time window that time scale can be altered as desired is utilized to intercept biological acoustical signal, form ping, based on broadband signal ambiguity function criterion, single ping or the assembled pulse that is combined into by multiple pings are asked for ambiguity function, according to the threshold condition set, such as range resolution and speed resoluting force etc., filter out the sonar signals waveform of function admirable, improve the performance of detection.
The present invention adopts the technical scheme that, based on the active sonar waveform screening technique of Wideband ambiguity function and marine organisms sound, its realize process as it is shown in figure 1,
Marine organisms sound data base 1 is for storing the original sound that various marine organisms send, such as the cry of killer whale, dolphin, sea lion etc.；
Further, the rectangular window that sound interceptor 2 utilizes time span T variable goes biological sound data are intercepted, and forms ping；
Further, pulse combined device 3 has two functions；First function is: single ping is conveyed directly to signal type arbiter 4；Second function is: be combined forming train of pulse by multiple pings, and then train of pulse is sent to signal type arbiter 4；Noting: when multiple pings are combined, the interval t between their order and ping all can be adjusted as required；
Further, the signal type arbiter 4 pulse to receiving or assembled pulse string carry out spectrum analysis, according to the result of spectrum analysis signal are divided into narrow band signal and broadband signal, and broadband signal is sent to Wideband ambiguity function arithmetical unit 5；
Further, formula is utilized Wideband ambiguity function arithmetical unit 5The pulse that signal type arbiter 4 is sent carries out ambiguity function computing, and ambiguity function operation result is sent to speed resoluting force screening washer 6；Wherein, τ represents time delay, and η=(1+v/c)/(1-v/c) represents Doppler's scale factor, and s (t) represents the signal waveform of marine organisms ping, the propagation rate of c representation signal, v represents the radial motion speed of active sonar system and detection target.
Further, ambiguity function is screened by speed resolving power screening washer 6 according to the speed resoluting force threshold value Vn set, if ambiguity function meets threshold requirement, then ambiguity function operation result is resent to range resolution screening washer 7；
Further, ambiguity function is screened by range resolution screening washer 7 according to the range resolution threshold value Rn set, if ambiguity function meets threshold requirement, then ambiguity function operation result is resent to hidden pulse storehouse 8；
Further, pulse or train of pulse that the ambiguity function of the satisfied requirement that range resolution screening washer 7 is sent by hidden pulse storehouse 8 is corresponding store, and form hidden pulse storehouse.
Advantage based on the active sonar waveform screening technique of Wideband ambiguity function and marine organisms sound of the present invention is: (1) utilizes original marine organisms pulse or assembled pulse as the transmitting signal waveform of active sonar, improves it disguised；(2) time window that time scale can be altered as desired is utilized to intercept biological acoustical signal, form ping, based on broadband signal ambiguity function criterion, single ping or the assembled pulse that is combined into by multiple pings are asked for ambiguity function, according to the threshold condition set, such as range resolution and speed resoluting force etc., filter out the sonar signals waveform of function admirable, improve the performance of detection.
Claims (1)
1., based on an active sonar waveform screening washer for Wideband ambiguity function and marine organisms sound, it is characterized in that, including:
Marine organisms sound archival memory for storing the original sound that various marine organisms send, including killer whale, dolphin, sea lion cry；
Sound interceptor, utilizes rectangular window variable for time span T that the biological sound data from marine organisms sound archival memory are intercepted, and forms ping and is sent to pulse combined device；
Pulse combined device；For single ping is conveyed directly to signal type arbiter；Or it is combined forming train of pulse by multiple pings, then train of pulse is sent to signal type arbiter；
The signal type arbiter pulse to receiving or assembled pulse string carry out spectrum analysis, according to the result of spectrum analysis signal are divided into narrow band signal and broadband signal, and broadband signal is sent to Wideband ambiguity function arithmetical unit；
Wideband ambiguity function utilizes formula arithmetical unitThe pulse that signal type arbiter is sent carries out ambiguity function computing, and ambiguity function operation result is sent to speed resoluting force screening washer；Wherein, τ represents time delay, and η=(1+v/c)/(1-v/c) represents Doppler's scale factor, and s (t) represents the signal waveform of marine organisms ping, the propagation rate of c representation signal, v represents the radial motion speed of active sonar system and detection target；
Ambiguity function is screened by speed resolving power screening washer according to the speed resoluting force threshold value Vn set, if ambiguity function meets threshold requirement, then ambiguity function operation result is resent to range resolution screening washer；
Ambiguity function is screened by range resolution screening washer according to the range resolution threshold value Rn set, if ambiguity function meets threshold requirement, then ambiguity function operation result is resent to hidden pulse storehouse；
Pulse or train of pulse that the ambiguity function of the satisfied requirement that range resolution screening washer is sent by hidden pulse storehouse is corresponding store, and form hidden pulse storehouse.
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Cited By (4)
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| CN106569200A (en) * | 2016-11-04 | 2017-04-19 | 天津大学 | Submarine concealment enhancement method based on marine mammal sounds |
| CN111175729A (en) * | 2020-01-18 | 2020-05-19 | 中国科学院水生生物研究所 | Real-time online monitoring and early warning system based on whale high-frequency sonar signals |
| CN112182868A (en) * | 2020-09-21 | 2021-01-05 | 天津大学 | Shallow sea active sonar detection method based on whale/dolphin click sound calling |
| CN114545422A (en) * | 2022-04-25 | 2022-05-27 | 杭州应用声学研究所(中国船舶重工集团公司第七一五研究所) | Active sonar target identification method based on multiple physical characteristics |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569200A (en) * | 2016-11-04 | 2017-04-19 | 天津大学 | Submarine concealment enhancement method based on marine mammal sounds |
| CN111175729A (en) * | 2020-01-18 | 2020-05-19 | 中国科学院水生生物研究所 | Real-time online monitoring and early warning system based on whale high-frequency sonar signals |
| CN111175729B (en) * | 2020-01-18 | 2022-03-29 | 中国科学院水生生物研究所 | Real-time online monitoring and early warning system based on whale high-frequency sonar signals |
| CN112182868A (en) * | 2020-09-21 | 2021-01-05 | 天津大学 | Shallow sea active sonar detection method based on whale/dolphin click sound calling |
| CN112182868B (en) * | 2020-09-21 | 2023-03-24 | 天津大学 | Shallow sea active sonar detection method based on whale/dolphin click sound calling |
| CN114545422A (en) * | 2022-04-25 | 2022-05-27 | 杭州应用声学研究所(中国船舶重工集团公司第七一五研究所) | Active sonar target identification method based on multiple physical characteristics |
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Application publication date: 20160720 |