CN105182318A - Interface reverberation suppression method suitable for shallow sea side-scan sonar - Google Patents
Interface reverberation suppression method suitable for shallow sea side-scan sonar Download PDFInfo
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- CN105182318A CN105182318A CN201510548969.7A CN201510548969A CN105182318A CN 105182318 A CN105182318 A CN 105182318A CN 201510548969 A CN201510548969 A CN 201510548969A CN 105182318 A CN105182318 A CN 105182318A
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- scan sonar
- release
- beam angle
- battle
- vertical beam
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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
- G01S7/537—Counter-measures or counter-counter-measures, e.g. jamming, anti-jamming
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention relates to an interface reverberation suppression method suitable for shallow sea side-scan sonar. The method comprises the following steps: selecting side-scan sonar, where a transducer array is in an upper and lower array mode; setting wave beam open angle for the upper and lower arrays in the transducer array of the side-scan sonar; and the upper and lower arrays of the transducer array of the side-scan sonar adopting a frequency division and time division combined method to generate signals and emitting the signals. The method can give consideration to the need of long-range detection on the basis of guaranteeing the performance of the side-scan sonar, and has important significance for realizing side-scan sonar high-efficiency shallow sea small target detection.
Description
Technical field
The present invention relates to sonar field, particularly a kind of interface reverberation suppression method being applicable to shallow sea side-scan sonar.
Background technology
Side-scan sonar is current widely used subaqua-tic geomorphology and small target detection equipment under water.During work, side-scan sonar is forming two narrow beams perpendicular to direction, course, by the morphologic characteristics in target-echo intensity reacting condition seabed, during for small target deteection under water, the bright spot that target echo produces and be principal character for target detection owing to covering the sound shade caused.But when side-scan sonar uses in shallow sea, multi-path effect is remarkable, and the interface reverberation introduced by multi-path effect causes picture contrast decline, image definition reduction etc., is the principal element affecting shallow sea side-scan sonar serviceability.
For suppressing interface reverberation, existing side-scan sonar generally adopts the method for adjustment basic matrix established angle, namely increases basic matrix mounting inclination angle when interface reverberation is remarkable, makes radiating surface towards the bottom, thus reduces the many ways from the water surface, the operating distance but this can have the greatest impact.
Summary of the invention
The object of the invention is to overcome the limited defect of existing interface reverberation suppression method detection range, thus a kind of interface reverberation suppression method that can improve shallow sea side-scan sonar serviceability is provided.
To achieve these goals, the invention provides a kind of interface reverberation suppression method being applicable to shallow sea side-scan sonar, comprising:
Step 1), the side-scan sonar of selecting transducer array to be upper and lower battle array pattern;
Step 2), set wave beam angle of release respectively for the battle array up and down in the transducer array of side-scan sonar;
Step 3), the method that upper and lower battle array adopts frequency division, the time-division combines in the transducer array of side-scan sonar generates signal and launches.
In technique scheme, the vertical beam angle of release sum of the vertical beam angle of release of going into battle and lower battle array is between 40-55 degree, and vertical beam angle of release of going into battle is less than lower battle array vertical beam angle of release, and goes into battle vertical beam angle of release between 10-18 degree.
In technique scheme, vertical beam angle of release of going into battle is 14 degree, and lower battle array vertical beam angle of release is 28 degree.
In technique scheme, described step 3) comprise further:
Step 3-1), the go into battle centre frequency of the signal that will launch of setting is f
1, this signal is at t
1period launches, and the expression formula of this signal is:
s
1(n)＝exp[j(2πf
1t+πkt
2)]t∈[t
1,t
1+T]；
Wherein, k is frequency change rate, the T indicating impulse cycle;
Step 3-2), the centre frequency of signal that will launch of the lower battle array of setting is f
2, this signal is at t
2period launches, and the expression formula of this signal is:
s
2(n)＝exp[j(2πf
2t+πkt
2)]t∈[t
2,t
2+T]。
The invention has the advantages that:
The present invention is directed in the side-scan sonar use of shallow sea, because multi-path effect causes interface reverberation to affect significant problem, propose a kind of interface reverberation suppression method based on battle array designing technique.The method adopts upper and lower two submatrixs, realizes two transmitting-receiving narrow beams, realizes direct wave be separated with multi-path signals by spatial manipulation.The method on the basis of side-scan sonar performance guarantee, can take into account the needs of long-range detection, and for realizing, side-scan sonar high-level efficiency shallow sea small target detection is significant.
Accompanying drawing explanation
Fig. 1 is the multipath structure schematic diagram of side-scan sonar;
Fig. 2 is into the schematic diagram of the transducer array of upper and lower battle array pattern;
Fig. 3 is the schematic diagram of vertical beam angle of release and lower battle array vertical beam angle of release of going into battle;
Fig. 4 is the schematic diagram of emergence angle with distance change curve of the multi-path signals adopting conventional sonar of the prior art to obtain;
Fig. 5 is the schematic diagram of incident angle with distance change curve of the multi-path signals adopting conventional sonar of the prior art to obtain;
Fig. 6 adopts the side-scan sonar emergence angle that obtains of method of the present invention with the schematic diagram of distance change curve;
Fig. 7 adopts the side-scan sonar incident angle that obtains of method of the present invention with the schematic diagram of distance change curve;
Fig. 8 is the process flow diagram of method of the present invention.
Embodiment
Now the invention will be further described by reference to the accompanying drawings.
Before the present invention is described, first analyze the multipath structure of shallow sea side-scan sonar.So-called multipath structure refers to the time and space regularity of distribution of multi-path signals.At depth of water H, towing depth h, the water surface is smooth and under only considering to there is the condition of mirror-reflection, the multipath structure schematic diagram of side-scan sonar as shown in Figure 1.This multipath structure is only considered to be expressed as B, Bs, sB, Bsb, bsB in many ways, first three rank that intensity is larger; Wherein, B represents once end scattering, and a behalf water surface mirror reflection, b representative is water-bed mirror reflection once.
In order to realize interface Reverberation Rejection, with reference to figure 8, method of the present invention comprises the following steps:
Step 1), the side-scan sonar of selecting transducer array to be upper and lower battle array pattern.
Fig. 2 is into the schematic diagram of the transducer array of upper and lower battle array pattern, and as can be seen from the figure, this transducer array is divided into goes into battle and lower battle array, described in go into battle and include the transducer of several linear array with lower battle array separately.The transducer array of this pattern contributes to realizing being separated of direct wave and many ways.
Step 2), set wave beam angle of release respectively for the battle array up and down in transducer array.
According to the designing requirement of side-scan sonar, see Fig. 3, in one embodiment, vertical beam angle of release 14 degree of going into battle, lower battle array vertical beam angle of release 28 degree.In other embodiments, go into battle vertical beam angle of release and lower battle array vertical beam angle of release sum generally between 40-55 degree, vertical beam angle of release of going into battle is less than lower battle array vertical beam angle of release, and vertical beam angle of release of going into battle is generally 10-18 degree.By the setting of wave beam angle of release, become the transducer array of upper and lower battle array pattern can form upper and lower two narrow beams.
Step 3), the method that upper and lower battle array adopts frequency division, the time-division combines in transducer array generates signal and launches.
In order to distinguish the beam signal of going into battle and launching with lower battle array, the centre frequency setting the signal that will launch of going into battle is f
1, this signal is at t
1period launches, and its expression formula is as follows:
s
1(n)＝exp[j(2πf
1t+πkt
2)]t∈[t
1,t
1+T]
Wherein, k is frequency change rate, the T indicating impulse cycle.
The centre frequency of the signal that the lower battle array of setting will be launched is f
2, this signal is at t
2period launches, and its expression formula is as follows:
s
2(n)＝exp[j(2πf
2t+πkt
2)]t∈[t
2,t
2+T]
Wherein, k is frequency change rate.
Different by the centre frequency of going into battle with two groups of signals that lower battle array is launched respectively, also different on launch time, so can not aliasing be caused.
Below in conjunction with example, method of the present invention is illustrated.
In an example, suppose that the depth of water of wanted search coverage is 10m, the towing depth of side-scan sonar is 4m, and its multipath structure (considers the many ways, first three rank only accounting for major effect) as shown in Figure 4 and Figure 5.If adopt side-scan sonar of the prior art, its vertical beam angle of release is 40 degree, and mounting inclination angle is 10 degree, then receive and dispatch beam angle range be 10 degree to-30 degree.Multipath structure schematic diagram according to Fig. 4 and Fig. 5 can be found out, now much main way, first three rank all can with direct wave aliasing, cause serious interface reverberation interference.
After adopting the method for this method, owing to have employed narrow beam design, effectively can remove the impact on the many ways of second order.Second order many ways number of turns is few, and energy attenuation is little, and be topmost many ways components, therefore, as can be seen from Figures 6 and 7, after adopting this method, many way reverberation will be effectively suppressed.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, modify to technical scheme of the present invention or equivalent replacement, do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. be applicable to an interface reverberation suppression method for shallow sea side-scan sonar, comprise:
Step 1), the side-scan sonar of selecting transducer array to be upper and lower battle array pattern;
Step 2), set wave beam angle of release respectively for the battle array up and down in the transducer array of side-scan sonar;
Step 3), the method that upper and lower battle array adopts frequency division, the time-division combines in the transducer array of side-scan sonar generates signal and launches.
2. the interface reverberation suppression method being applicable to shallow sea side-scan sonar according to claim 1, it is characterized in that, the vertical beam angle of release sum of the vertical beam angle of release of going into battle and lower battle array is between 40-55 degree, vertical beam angle of release of going into battle is less than lower battle array vertical beam angle of release, and goes into battle vertical beam angle of release between 10-18 degree.
3. the interface reverberation suppression method being applicable to shallow sea side-scan sonar according to claim 2, is characterized in that, vertical beam angle of release of going into battle is 14 degree, and lower battle array vertical beam angle of release is 28 degree.
4. the interface reverberation suppression method being applicable to shallow sea side-scan sonar according to claim 1, is characterized in that, described step 3) comprise further:
Step 3-1), the go into battle centre frequency of the signal that will launch of setting is f
1, this signal is at t
1period launches, and the expression formula of this signal is:
s
1(n)＝exp[j(2πf
1t+πkt
2)]t∈[t
1,t
1+T]；
Wherein, k is frequency change rate, the T indicating impulse cycle;
Step 3-2), the centre frequency of signal that will launch of the lower battle array of setting is f
2, this signal is at t
2period launches, and the expression formula of this signal is:
s
2(n)＝exp[j(2πf
2t+πkt
2)]t∈[t
2,t
2+T]。
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| CN201510548969.7A CN105182318B (en) | 2015-08-31 | 2015-08-31 | A kind of interface reverberation suppression method suitable for shallow sea side-scan sonar |
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| CN105182318B CN105182318B (en) | 2017-11-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113759354A (en) * | 2020-06-02 | 2021-12-07 | 中国科学院声学研究所 | Self-adaptive bottom reverberation suppression method suitable for side-scan sonar |
Citations (3)
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| US20100046327A1 (en) * | 2008-08-06 | 2010-02-25 | Orlin David J | Methods and Systems to Detect Changes in Multiple-Frequency Band Sonar Data |
| CN103424738A (en) * | 2013-07-26 | 2013-12-04 | 中国船舶重工集团公司第七一五研究所 | Reverberation suppression method based on morphology |
| CN104678380A (en) * | 2015-01-26 | 2015-06-03 | 东南大学 | Direct wave restraining method based on LMS algorithm in high-speed small target detection |
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2015
- 2015-08-31 CN CN201510548969.7A patent/CN105182318B/en active Active
Patent Citations (3)
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| US20100046327A1 (en) * | 2008-08-06 | 2010-02-25 | Orlin David J | Methods and Systems to Detect Changes in Multiple-Frequency Band Sonar Data |
| CN103424738A (en) * | 2013-07-26 | 2013-12-04 | 中国船舶重工集团公司第七一五研究所 | Reverberation suppression method based on morphology |
| CN104678380A (en) * | 2015-01-26 | 2015-06-03 | 东南大学 | Direct wave restraining method based on LMS algorithm in high-speed small target detection |
Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113759354A (en) * | 2020-06-02 | 2021-12-07 | 中国科学院声学研究所 | Self-adaptive bottom reverberation suppression method suitable for side-scan sonar |
| CN113759354B (en) * | 2020-06-02 | 2024-02-09 | 中国科学院声学研究所 | Self-adaptive bottom reverberation suppression method suitable for side-scan sonar |
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| CN105182318B (en) | 2017-11-21 |
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