CN102353942B - Adaptive cancellation method for interference of underwater reverberation - Google Patents
Adaptive cancellation method for interference of underwater reverberation Download PDFInfo
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- CN102353942B CN102353942B CN 201110192668 CN201110192668A CN102353942B CN 102353942 B CN102353942 B CN 102353942B CN 201110192668 CN201110192668 CN 201110192668 CN 201110192668 A CN201110192668 A CN 201110192668A CN 102353942 B CN102353942 B CN 102353942B
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Abstract
The objective of the invention is to provide an adaptive cancellation method for an interference of underwater reverberation. The method comprises the following steps that: splitting beam formation is carried out on receiving signals of N array elements so as to form left and right homodromous wave beam outputs x1 and x2; and the left and the right wave beams are respectively formed by M array element data wave beams; phase inversion processing is carried out on the left wave beam output data and then the processed left wave beam output data is added by the right wave beam output data; and added data is utilized as a reference signal of an adaptive reverberation canceller; adaptive reverberation cancellation is carried out respectively on the left wave beam signal x1 and the right wave beam signal x2, wherein the adaptive reverberation canceller is an adaptive filter with an FIR structure, the input signal is a wave beam output signal and the reference signal is data d that is obtained by addition of the left wave beam output data that has been processed by the phase inversion processing and the right wave beam output data; and multiplication and integration processing is carried out on two outputs e1 and e2 after the adaptive reverberation canceller by the left and the right wave beam signals so as to obtain a final output y. According to the invention, the reverberation interference is further inhibited and the detection performance is improved.
Description
Technical field
What the present invention relates to is a kind of target echo signal detection method of bottom target field of detecting.
Background technology
Existing adaptive noise cancellation method is applied under water the reverberation adaptive cancellation and has obtained certain effect, yet its shortcoming is usually to include in the reference signal target echo signal, this is just so that when offsetting reverberation, also target echo signal is also balanced out, therefore can not effectively detect target.
Summary of the invention
The object of the present invention is to provide the adaptive cancellation method of disturbing for a kind of reverberation under water of the target echo signal detection of Reverberation under water.
The object of the present invention is achieved like this:
The adaptive cancellation method that a kind of reverberation under water of the present invention is disturbed is characterized in that:
(1) the reception signal of N array element carried out split beam formation, two wave beams output x in the same way about formation
1, x
2, left and right sides wave beam is respectively formed by M array element data beam and obtains;
(2) paraphase is processed to left wave beam output data, and then with the addition of right wave beam output data, the data after the addition are as the reference signal d of Adaptive reverberation canceller;
(3) respectively to left and right sides beam signal x
1, x
2Carry out the self-adaptation reverberation cancellation, Adaptive reverberation canceller is the sef-adapting filter of FIR structure, and its input signal is beamformer output signal, and reference signal is after the paraphase of left wave beam output data is processed and the data d after the addition of right wave beam output data;
(4) left and right sides beam signal is exported e by the two-way behind the Adaptive reverberation canceller
1, e
2Multiply each other and Integral Processing is finally exported y.
The present invention can also comprise:
1, the reference signal of described Adaptive reverberation canceller is processed, is then obtained with the addition of left wave beam output data by right wave beam being exported the data paraphase.
2, described reception signal to N array element carries out split beam and forms, about two wave beam array elements have overlapping.
3, the algorithm of described wave beam formation adopts time delay or phase shift beamforming algorithm.
4, the algorithm of described self-adaptation reverberation cancellation adopts the LMS algorithm.
Advantage of the present invention is: further suppressed the reverberation interference, improved the detection performance.
Description of drawings
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is signal processing synoptic diagram of the present invention;
Fig. 3 is that the result of squared envelope detection after the present invention and the matched filtering compares;
Fig. 4 is that the result of the present invention and split beam multiplicative array disposal route compares.
Embodiment
For example the present invention is described in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1～4, the course of work of the present invention:
The first step is carried out split beam to the reception signal of N array element and is formed, two wave beams output x in the same way about formation
1, x
2, left and right sides wave beam is respectively formed by M array element data beam and obtains.When wave beam forms, about two wave beams can have part array element overlapping.Beamforming algorithm adopts time delay or phase shift beamforming algorithm.
Second step, paraphase is processed to left (right side) wave beam output data, and then with the addition of right (left side) wave beam output data, the data after the addition are as the reference signal d of Adaptive reverberation canceller.
The 3rd step is respectively to left and right sides beam signal x
1, x
2Carry out the self-adaptation reverberation cancellation, Adaptive reverberation canceller is sef-adapting filter, adopt the FIR structure in this method, its input signal is beamformer output signal, and reference signal is the data d after the addition of rear and right (left side) wave beam output data is processed in the paraphase of left (right side) wave beam output data.Adaptive algorithm can adopt the LMS algorithm.
The 4th step, utilize reverberation different from the spatial coherence of signal, left and right sides beam signal is exported e by the two-way behind the Adaptive reverberation canceller
1, e
2Multiply each other and Integral Processing is finally exported y.
The principle of the invention is:
Utilize the reverberation characteristic different from the relativity of time domain of signal, adopt sef-adapting filter that the reception signal under the reverberation interference is carried out filtering, the reference signal of sef-adapting filter is the key of filter effect quality, therefore cannot contain echoed signal in the reference signal, adopt in the same way left and right sides wave beam to subtract each other to remove echoed signal can obtain pure reverberation and disturb as with reference to signal.Its principle is when having target echo signal, because the moment that the target echo signal in the wave beam of the left and right sides occurs is identical, can removes echoed signal after therefore subtracting each other and obtain pure reverberation interference conduct with reference to signal.And then the characteristic a little less than utilizing the reverberation spatial coherence than the spatial coherence of target echo signal, the output signal of two-way sef-adapting filter is carried out product integral process, further improve the mixed ratio of letter, detect performance thereby improve.
Key problem in technology among the present invention is:
(1) adopt split beam to form to obtain in the same way about two wave beams, by subtracting each other the reference signal that obtains Adaptive reverberation canceller, thereby solved the problem that Adaptive reverberation canceller when containing echoed signal in the reference signal weakens signal;
(2) simultaneously left and right sides wave beam is carried out two-way in time domain and carry out the self-adaptation reverberation cancellation;
(3) characteristic a little less than utilizing the reverberation spatial coherence than the spatial coherence of target echo signal is carried out product integral to two-way self-adaptation reverberation cancellation output signal and is processed, and disturbs thereby further suppress reverberation, improves and detects performance.
Adopt the instantiation of the inventive method:
Survey bottom target under water.When surveying bottom target, bottom reverberation is main interference.Receiving battle array is linear array, 16 array elements, array element distance 0.58cm.The emission battle array is the face battle array, but large tracts of land illuminates the seabed, transmits to be linear FM signal bandwidth 20kHz, pulsewidth 2.5ms.Two wave beams about split beam forms, beam direction is-4 degree (tactical deployment of troops is to being 0 degree, and left-hand is for negative, dextrad for just), each is formed left and right sides wave beam by 15 array element data beams and obtains employing time delay beamforming algorithm.Left beam data is carried out paraphase process, obtain reference signal with right beam data addition, respectively left and right sides beam data is carried out the reverberation adaptive cancellation, wave filter is the FIR structure, and the exponent number that obtains reverberation adaptive cancellation device by optimization is 2 rank.Adaptive algorithm adopts the LMS algorithm, and step-length is 0.01.Left and right sides beam signal after offsetting is multiplied each other, the data after multiplying each other are carried out time-domain integration process.Last the method compares with conventional treatment method (squared envelope detection after the matched filtering) and the result of split beam multiplicative array disposal route respectively, as shown in Figure 3 and Figure 4.Among Fig. 3, upper figure is the output of (16 array element) after wave beam forms, bottom target echo not obvious (locating for 16000), middle figure is the result of squared envelope detection after the matched filtering, can detect significantly target echo, it is comparatively serious that but reverberation is disturbed, and figure below is this method, and this method has effectively suppressed by comparison reverberation and disturbed and significantly detect target echo.That split beam forms rear left and right sides beamformer output signal among Fig. 4, directly adopt left and right sides wave beam to carry out the result that multiplicative array is processed, and this method result, this method is compared with multiplicative array and has still effectively been suppressed the reverberation interference and can significantly detect target echo.
Claims (3)
1. the adaptive cancellation method disturbed of a reverberation under water is characterized in that:
(1) the reception signal of N array element carried out split beam formation, two wave beams output x in the same way about formation
1, x
2, left and right sides wave beam is respectively formed by M array element data beam and obtains;
(2) paraphase is processed to left wave beam output data, and then with the addition of right wave beam output data, the data after the addition are as the reference signal d of Adaptive reverberation canceller;
(3) respectively to left and right sides beam signal x
1, x
2Carry out the self-adaptation reverberation cancellation, Adaptive reverberation canceller is the sef-adapting filter of FIR structure, and its input signal is beamformer output signal, and reference signal is after the paraphase of left wave beam output data is processed and the data d after the addition of right wave beam output data;
(4) left and right sides beam signal is exported e by the two-way behind the Adaptive reverberation canceller
1, e
2Multiply each other and Integral Processing is finally exported y;
Described reception signal to N array element carries out split beam and forms, about two wave beam array elements have overlapping.
2. the adaptive cancellation method of a kind of interference of reverberation under water according to claim 1 is characterized in that: algorithm employing time delay or phase shift beamforming algorithm that described wave beam forms.
3. the adaptive cancellation method of a kind of interference of reverberation under water according to claim 1 and 2 is characterized in that: the algorithm employing LMS algorithm of described self-adaptation reverberation cancellation.
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| CN103487794B (en) * | 2012-06-13 | 2016-01-06 | 中国科学院声学研究所 | A kind of underwater reverberation suppression method based on wavelet package transforms |
| CN103513240B (en) * | 2012-06-20 | 2015-09-09 | 中国科学院声学研究所 | A kind of underwater reverberation suppression method based on support vector regression |
| 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 |
| CN109490851B (en) * | 2018-11-27 | 2021-05-28 | 重庆秦嵩科技有限公司 | Anti-interference method based on inter-pulse pseudo-random code |
| CN111679245B (en) * | 2020-05-22 | 2022-07-12 | 哈尔滨工程大学 | Sub-array coincidence split beam orientation method based on uniform circular array |
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| CN101040512A (en) * | 2004-10-13 | 2007-09-19 | 皇家飞利浦电子股份有限公司 | Echo cancellation |
| CN101452074A (en) * | 2007-12-07 | 2009-06-10 | 南京理工大学 | Strong clutter self-adapting cancellation apparatus for analog-digital combined treatment |
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| CN101040512A (en) * | 2004-10-13 | 2007-09-19 | 皇家飞利浦电子股份有限公司 | Echo cancellation |
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