CN102004240B - Unknown target detection signal reference waveform extraction method based on antenna array - Google Patents
Unknown target detection signal reference waveform extraction method based on antenna array Download PDFInfo
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- CN102004240B CN102004240B CN2010105183104A CN201010518310A CN102004240B CN 102004240 B CN102004240 B CN 102004240B CN 2010105183104 A CN2010105183104 A CN 2010105183104A CN 201010518310 A CN201010518310 A CN 201010518310A CN 102004240 B CN102004240 B CN 102004240B
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Abstract
The invention belongs to the field of unknown target detection technologies and relates to an unknown target detection signal reference waveform extraction method based on an antenna array. The unknown target detection signal reference waveform extraction method comprises the following steps of: arranging the same group of antennas into an array in a plane at the same intervals, wherein the centers of all antennas are positioned in the same straight line; and each antenna is vertical to the straight line; placing the group of antenna array near a detection target; firstly transmitting a signal by one antenna so that an echoed signal is received by all other antennas, and sequentially repeating the transmitting and receiving process by other antennas in the antenna array; and grouping the received signals according to the principle that the transmitting antennas and the receiving antennas have the same intervals, and averaging all of the signals in each group to extract the reference signal waveform having an equivalent receiving and transmitting antenna pair. The invention is simple and practicable, and can obtain accurate reference waveform.
Description
Technical field
The invention belongs to invisible target detection technical field, relate to a kind of unknown object detectable signal reference waveform method for distilling.
Background technology
Survey the research of invisible target (like tumour in external detection human body) at aerial array, will carry out acquisition of signal to two kinds of situation of search coverage respectively usually.Once be that the detection of a target exists situation, another time is that the detection of a target does not exist situation.Twice detectable signal to aerial array obtains respectively asks poor, can obtain the signal message that target reflects.To obtaining the information such as existence and position that image comes display-object through asking the signal handled of difference to carry out image reconstruction process.Wherein the target detectable signal waveform that do not exist under the situation to be obtained is a reference waveform.Though this process is feasible in analog computation and experimental phase, how to obtain the key issue that reference waveform becomes above-mentioned signal Processing and imaging process during practical application.
Summary of the invention
The purpose of this invention is to provide a kind of reference waveform method for distilling that can be used in the invisible target detection.This kind method for distilling need not to make up corresponding detection model in addition for obtaining reference signal waveform, only need both once survey and can realize the search coverage of reality.For this reason, the present invention adopts following technical scheme:
A kind of unknown object detectable signal reference waveform method for distilling based on aerial array is characterized in that, comprises the following steps:
(1) one group of identical antenna in one plane is arranged in array according to identical distance, being centered close on same the straight line of each antenna, and each antenna is all perpendicular to this straight line;
(2) this group aerial array is placed near the detection of a target;
(3) at first transmitted by an antenna, its echoed signal is received by all the other all antennas, repeats the above-mentioned process that transmits and receives by other antennas in the aerial array successively;
(4) principle that has a same intervals by emitting antenna and receiving antenna is divided into groups to received signal, has the right reference signal waveform of equivalent dual-mode antenna through all signals in each group are asked on average to extract.
The present invention need not to make up corresponding detection model in addition for obtaining reference signal waveform, only need both once survey and can realize the search coverage of reality, be i.e. simple possible and can obtain accurate reference waveform.Through the checking of signal contrast and imaging effect, pairing reference waveform when the reference signal waveform that the method that adopts the present invention to propose obtains can substitute driftlessness and exists.Utilize the present invention to extract after the reference signal waveform, just can be with carrying out practical application based on the technology of the aerial array detection of a target of asking difference method.
Description of drawings
Fig. 1 adopts reference waveform method for distilling of the present invention to carry out the experimental provision synoptic diagram of simulated experiment.
Fig. 2 (a) and Fig. 2 (b) are for amounting to 12 groups of combinations of equivalence send-receive (E1D2, E2D1, E2D3, E3D2, E3D4; E4D3, E4D5, E5D4, E5D6, E6D5; E6D7, the signal that E7D6) is detected, wherein, there is situation in the corresponding driftlessness of Fig. 2 (a), and there is situation in Fig. 2 (b) to target should be arranged.
Fig. 3 (a) is for being example with E2D3, the contrast of the detectable signal that obtains when driftlessness exists and combination 1 signal.The signal contrast that the signal of Fig. 3 (b) when having target to exist obtained with driftlessness and combination-1 signal subtraction respectively.
The reconstructed image that the reference waveform that Fig. 4 utilizes method of the present invention to obtain is realized.
Embodiment
Referring to Fig. 1, the reference waveform method for distilling that the present invention proposes, the sniffer that is adopted is an aerial array, and one group of identical antenna (for example: 7) is arranged in array by same intervals d, adopts transmitting-receiving to separate and transmits and receives signal.In analogue experiment installation; The detection of a target is placed at some positions of a rectangle search coverage; In rectangle detecting area upper and lower an interfere with layer is set respectively; The purpose that interfere with layer is set is in order to explain that this technology under the condition that has different chaff interferences to exist, still can effectively accurately detect unknown object (for example the interfere with layer on top is a skin, and the bottom interfere with layer is other physiological tissues).Different objects in the rectangle search coverage has electromagnetic property parameter separately.In detection process, at first launch ultra-broadband signal by an antenna, the signal that signal source is returned through transmission in search coverage is received by all the other all antennas.Repeat the above-mentioned process that transmits and receives by other antennas in the aerial array successively.The principle that has same intervals by emitting antenna and receiving antenna is divided into groups to received signal.Through being asked on average to extract, all signals in dividing into groups have the right reference signal waveform of equivalent dual-mode antenna.Grouping situation with the grouping of equally spaced emitting antenna and receiving antenna is as shown in table 1.
Table 1 has equally spaced emitting antenna and receiving antenna divides into groups
In the table 1, E representes emitting antenna, and D representes receiving antenna.Example E1D2 representes that antenna A1 is used for emitting antenna, and A2 is used for receiving.Through asking averaging method to obtain the right reference signal waveform of equivalent dual-mode antenna, example: can obtain corresponding reference signal waveform combination-1 by 1 12 equivalent situation of dividing into groups is:
combin_1＝(E1D2+E2D1+E2D3+E3D2+E3D4+E4D3+E4D5+E5D4+E5D6+E6D5+E6D7+E7D6)/12。
Fig. 2 is for amounting to 12 groups of combinations of equivalence send-receive (E1D2, E2D1, E2D3, E3D2, E3D4, E4D3, E4D5, E5D4, E5D6, E6D5, E6D7, the signals that E7D6) detected.Wherein there is situation in figure (a) corresponding driftlessness, and there is situation in figure (b) to target should be arranged.
Can find out have antenna eliminator to be combined as the method for distilling correct and effective of the aerial array detectable signal reference waveform of principle with dual-mode antenna with same intervals through Fig. 3 and Fig. 4.The reference signal of utilizing method provided by the invention to obtain can substitute the reference signal that obtains under the driftlessness situation, and the reconstructed image of acquisition can correctly reflect the position of target to be measured.And in reality, the reference signal under the driftlessness existence condition can't directly obtain.Therefore can implement this technology, obtain effective reference signal.Implementation process of the present invention is simple, and effect is remarkable, aspect engineering sounding and the medical imaging indagation important application is being arranged.
Claims (1)
1. the unknown object detectable signal reference waveform method for distilling based on aerial array is characterized in that, comprises the following steps:
(1) one group of identical antenna in one plane is arranged in array according to identical distance, being centered close on same the straight line of each antenna, and each antenna is all perpendicular to this straight line;
(2) this group aerial array is placed near the detection of a target;
(3) at first transmitted by an antenna, its echoed signal is received by all the other all antennas, repeats the above-mentioned process that transmits and receives by other antennas in the aerial array successively;
(4) principle that has a same intervals by emitting antenna and receiving antenna is divided into groups to received signal, has the right reference signal waveform of equivalent dual-mode antenna through all signals in each group are asked on average to extract.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105183104A CN102004240B (en) | 2010-10-25 | 2010-10-25 | Unknown target detection signal reference waveform extraction method based on antenna array |
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| CN2010105183104A CN102004240B (en) | 2010-10-25 | 2010-10-25 | Unknown target detection signal reference waveform extraction method based on antenna array |
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| CN102004240A CN102004240A (en) | 2011-04-06 |
| CN102004240B true CN102004240B (en) | 2012-08-22 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1527950A (en) * | 2001-04-20 | 2004-09-08 | �����ټ� | A method and apparatus for identifying buried objects using ground penetrating radar |
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| KR100920768B1 (en) * | 2009-06-24 | 2009-10-07 | 엘아이지넥스원 주식회사 | Ultra wide band radar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1527950A (en) * | 2001-04-20 | 2004-09-08 | �����ټ� | A method and apparatus for identifying buried objects using ground penetrating radar |
Non-Patent Citations (1)
| Title |
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| 肖夏等.LSAWs测量低介电常数介质薄膜杨氏模量的信号处理.《天津大学学报》.2007,第40卷(第5期),第554-558页. * |
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