CN102540262A - Nonlinear node detector - Google Patents
Nonlinear node detector Download PDFInfo
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- CN102540262A CN102540262A CN2010106058351A CN201010605835A CN102540262A CN 102540262 A CN102540262 A CN 102540262A CN 2010106058351 A CN2010106058351 A CN 2010106058351A CN 201010605835 A CN201010605835 A CN 201010605835A CN 102540262 A CN102540262 A CN 102540262A
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Abstract
The invention provides a nonlinear node detector which is used for detecting electronic targets, and comprises a signal processing terminal unit, a swept-frequency signal generating unit, a first amplifier, a transmitting antenna, a receiving antenna, a second amplifier, a swept-frequency receiving local-oscillator unit, a receiving mixer and a frequency-mixing signal processing unit. In the invention, the existence and position of an electronic target are detected by using swept-frequency signals, because the level characteristics of a frequency-mixing output signal obtained by the detector when an electronic target exists are completely different from the level characteristics of a frequency-mixing output signal obtained by the detector when only an interference signal exists, a situation that whether an echo signal is emitted by an electronic target or the echo signal is an interference signal can be easily judged, and the interference of other electromagnetic signals in an environmental background can be effectively avoided, thereby improving the detection performance of the nonlinear node detector to the electronic target and reducing the false alarm rate.
Description
Technical field
The present invention relates to the security protection technical field of detection, specifically, the present invention relates to a kind of non-linear node detector.
Background technology
In the security protection technical field of detection; Non-linear node detector can be used for detecting be hidden in the article such as luggage, parcel, body of wall, furniture and the person on electronic installation; Also can be used for detecting the electronic target that interception remote controlled bomb, land mine, wiretap, mobile phone, digital camera, recording pen etc. possibly bring personal safety and information security hidden danger, can be widely used in the security protection detection range in place, all kinds of key.
Electronic installation generally is made up of electronic circuit, and the fundamental element of electronic circuit is a diode, and diode is that two kinds of semiconductor substances connect and form.According to the characteristic of diode, generally the tie-point with diode is referred to as non-linear node.Along with the fast development of electronics industry, a large amount of diode, triode and integrated circuit of using make in these electronic installations, to have one or more non-linear nodes on various electronic installations.Non-linear node detector is exactly in the zone of searching, to send frequency electromagnetic waves; Excite the self-excitation echo on the non-linear node in the various electronic installations; Capture various self-excitation echoes with the receiver on the non-linear node detector then; To reach the purpose that electronic target is surveyed, located, all widespread uses at home and abroad at present.
Yet; Progress along with electronic science and technology; There is a large amount of electronic installations to come into operation in the activity in production at present, also has a large amount of mixed and disorderly electromagnetic wave signals in addition in the surroundings background, also have other electromagnetic signal of a large amount of various frequencies near the frequency band (being generally 800MHz-4GHz) that non-linear node detector is worked; This type of useless signal often disturbs the operate as normal of non-linear node detector, causes false-alarm.Existing non-linear node detector is generally a non-linear node detector of frequency system; The point that it the sent frequency of penetrating signal that takes place frequently is fixed; If just in time there is the undesired signal of this frequency in the environmental background, then it just in time can influence the operate as normal of this non-linear node detector.In fact; Because the frequency of the undesired signal that exists in the environmental background is varied; The existing non-linear node detector of system frequently is difficult to find one and just in time avoids the frequency that all undesired signals influence; Survey the electronic target that possibly bring personal safety and information security hidden danger, promptly existing non-linear node detector can't operate as normal in the electromagnetic environment of disturbing, and has influenced its further promoting the use of under all kinds of complicated environments for use.
Summary of the invention
Technical matters to be solved by this invention provides a kind of non-linear node detector that adopts the frequency sweep system, can avoid the Electromagnetic Interference signal in the environmental background effectively, improves the detection performance to electronic target, reduces false alarm rate.
For solving the problems of the technologies described above, the present invention provides a kind of non-linear node detector, is used to survey electronic target, comprising:
The signal Processing terminal unit;
The swept-frequency signal generating unit is connected with said signal Processing terminal unit, is used for sending frequency sweep according to the indication of said signal Processing terminal unit and transmits;
First amplifier is connected with said swept-frequency signal generating unit, is used for the amplification that transmits of said frequency sweep;
Emitting antenna is connected with said first amplifier, is used for frequency sweep with said amplification and transmits and launch;
Receiving antenna is used to receive echoed signal;
Second amplifier is connected with said receiving antenna, is used for said echoed signal is amplified;
Frequency sweep receives the local oscillator unit, is connected with said signal Processing terminal unit, is used for sending the frequency sweep reception local oscillation signal that transmits and change synchronously with said frequency sweep according to the indication of said signal Processing terminal unit;
Receiving mixer receives the local oscillator unit with said second amplifier and frequency sweep respectively and is connected, and is used for the echoed signal and the frequency sweep of said amplification are received the local oscillation signal mixing, forms mixer output signal; And
The mixed frequency signal processing unit; Be connected with the signal Processing terminal unit with said receiving mixer respectively; Being used for that said mixer output signal is carried out filtering, amplification and detection handles; Send to said signal Processing terminal unit then, judge whether said echoed signal is sent by said electronic target.
Alternatively, said swept-frequency signal generating unit comprises:
Sweep generator is connected with said signal Processing terminal unit, is used for producing swept-frequency signal according to the indication of said signal Processing terminal unit;
Lock phase local vibration source is connected with said signal Processing terminal unit, is used for producing fixedly point-frequency signal according to the indication of said signal Processing terminal unit;
Transmitting mixer, local vibration source is connected with locking mutually with said sweep generator respectively, is used for said swept-frequency signal and point of fixity frequency signal mixing; And
Wave filter is connected with first amplifier with said transmitting mixer respectively, is used for the signal of after said transmitting mixer mixing, exporting is carried out Filtering Processing, sends frequency sweep and transmits.
Alternatively, said non-linear node detector operation frequency band is 800MHz-4GHz.
Alternatively, said mixer output signal is continuous DC level after handling through filtering, amplification and detection.
Alternatively, said echoed signal is the self-excitation echo of the non-linear node of said electronic target.
Alternatively, said sweep generator is the DDS compositor.
Compared with prior art, the present invention has the following advantages:
The present invention surveys the existence and the position of electronic target through using swept-frequency signal; Because the level nature of the mixer output signal that the level nature of the mixer output signal that detector is obtained when having electronic target to exist is obtained when only undesired signal being arranged is inequality fully; Can judge easily echoed signal be send for electronic target or be undesired signal; Can avoid the interference of other electromagnetic wave signal in the environmental background effectively; Raising reduces false alarm rate to the detection performance of electronic target.
Description of drawings
Above-mentioned and other characteristic, character and advantage of the present invention will become more obvious through the description below in conjunction with accompanying drawing and embodiment, wherein:
Fig. 1 is the structured flowchart of the non-linear node detector of one embodiment of the invention;
Fig. 2 is the structured flowchart of swept-frequency signal generating unit of the non-linear node detector of one embodiment of the invention.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing the present invention is described further, but should limit protection scope of the present invention with this.
Fig. 1 is the structured flowchart of the non-linear node detector of one embodiment of the invention.As shown in the figure, this non-linear node detector 200 can be used to survey electronic target, and it can comprise:
Signal Processing terminal unit 201;
Swept-frequency signal generating unit 202 is connected with signal Processing terminal unit 201, is used for sending frequency sweep according to the indication of signal Processing terminal unit 201 and transmits;
Receiving antenna 205 is used to receive echoed signal;
Frequency sweep receives local oscillator unit 207, is connected with signal Processing terminal unit 201, is used for sending the frequency sweep reception local oscillation signal that transmits and change synchronously with frequency sweep according to the indication of signal Processing terminal unit 201;
Receiving mixer 208 receives local oscillator unit 207 with second amplifier 206 and frequency sweep respectively and is connected, and is used for echoed signal of amplifying and frequency sweep are received the local oscillation signal mixing, forms mixer output signal; And
Mixed frequency signal processing unit 209; Be connected with signal Processing terminal unit 201 with receiving mixer 208 respectively; Be used for that mixer output signal is carried out filtering, amplification and detection and handle, send to signal Processing terminal unit 201 then, judge whether echoed signal is sent by electronic target.
Fig. 2 is the structured flowchart of swept-frequency signal generating unit of the non-linear node detector of one embodiment of the invention.As shown in the figure, swept-frequency signal generating unit 202 can comprise:
Sweep generator 2021 is connected with signal Processing terminal unit 201, is used for producing swept-frequency signal according to the indication of signal Processing terminal unit 201;
Lock phase local vibration source 2022 is connected with signal Processing terminal unit 201, is used for producing fixedly point-frequency signal according to the indication of signal Processing terminal unit 201;
Transmitting mixer 2023, local vibration source 2022 is connected with locking mutually with sweep generator 2021 respectively, is used for swept-frequency signal and point of fixity frequency signal mixing; And
In the present embodiment, non-linear node detector operation frequency band can be 800MHz-4GHz.
In the present embodiment; If the received echoed signal of detector is the self-excitation echo of the non-linear node of electronic target really; Then the mixer output signal of this moment is the intermediate-freuqncy signal of a fixed frequency; And because this intermediate-freuqncy signal can exist all the time when the electronic target physical presence, it should be continuous DC level after handling through filtering, amplification and detection; If the received echoed signal of detector is a undesired signal; Then this moment, mixer output signal can not be fixed frequency; Perhaps because undesired signal can not exist all the time, it can not be a continuous DC level after handling through filtering, amplification and detection, and should be a short pulse signal; The level nature of the mixer output signal that its detector when having electronic target to exist is obtained is inequality fully; Can judge easily this echoed signal be send for electronic target or be undesired signal, confirm whether have suspicious electronic target in the current region, reduce false alarm rate effectively with this.
In the present embodiment, sweep generator can be the DDS compositor, combines the use of lock phase local vibration source again, the frequency accuracy and the sweep velocity of the swept-frequency signal that can guarantee to produce.Characteristics such as the DDS technology has that frequency resolution is little, frequency inverted speed is fast, volume is little, integrated level is high, design and convenient in application can be controlled its output frequency easily by the signal Processing terminal.The accurate swept-frequency signal of frequency that the DDS compositor produces and lock mutually after point of fixity signal mixing, the filtering frequently of local vibration source output the needed frequency sweep of generation detector transmit.
Detector adopts to follow the tracks of to receive working method when work.Detector gets into receiving mixer after the electronic target echoed signal that receiving antenna receives is amplified through second amplifier.Frequency sweep reception local oscillator unit receives the control of signal processing terminal unit, the frequency sweep reception local oscillation signal that output and frequency sweep transmit and change synchronously.Because frequency sweep transmits, frequency sweep receives local oscillation signal and is synchronous variation, therefore the mixer output signal through receiving mixer output is the intermediate-freuqncy signal of a fixed frequency.After filtering, amplification and detection processing, improve the receiving sensitivity of detector under the frequency sweep working system.
The present invention surveys the existence and the position of electronic target through using swept-frequency signal; Because the level nature of the mixer output signal that the level nature of the mixer output signal that detector is obtained when having electronic target to exist is obtained when only undesired signal being arranged is inequality fully; Can judge easily echoed signal be send for electronic target or be undesired signal; Can avoid the interference of other electromagnetic wave signal in the environmental background effectively; Raising reduces false alarm rate to the detection performance of electronic target, satisfies the use needs that current safety is surveyed.
Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting the present invention; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (6)
1. a non-linear node detector is used to survey electronic target, comprising:
The signal Processing terminal unit;
The swept-frequency signal generating unit is connected with said signal Processing terminal unit, is used for sending frequency sweep according to the indication of said signal Processing terminal unit and transmits;
First amplifier is connected with said swept-frequency signal generating unit, is used for the amplification that transmits of said frequency sweep;
Emitting antenna is connected with said first amplifier, is used for frequency sweep with said amplification and transmits and launch;
Receiving antenna is used to receive echoed signal;
Second amplifier is connected with said receiving antenna, is used for said echoed signal is amplified;
Frequency sweep receives the local oscillator unit, is connected with said signal Processing terminal unit, is used for sending the frequency sweep reception local oscillation signal that transmits and change synchronously with said frequency sweep according to the indication of said signal Processing terminal unit;
Receiving mixer receives the local oscillator unit with said second amplifier and frequency sweep respectively and is connected, and is used for the echoed signal and the frequency sweep of said amplification are received the local oscillation signal mixing, forms mixer output signal; And
The mixed frequency signal processing unit; Be connected with the signal Processing terminal unit with said receiving mixer respectively; Being used for that said mixer output signal is carried out filtering, amplification and detection handles; Send to said signal Processing terminal unit then, judge whether said echoed signal is sent by said electronic target.
2. non-linear node detector according to claim 1 is characterized in that, said swept-frequency signal generating unit comprises:
Sweep generator is connected with said signal Processing terminal unit, is used for producing swept-frequency signal according to the indication of said signal Processing terminal unit;
Lock phase local vibration source is connected with said signal Processing terminal unit, is used for producing fixedly point-frequency signal according to the indication of said signal Processing terminal unit;
Transmitting mixer, local vibration source is connected with locking mutually with said sweep generator respectively, is used for said swept-frequency signal and point of fixity frequency signal mixing; And
Wave filter is connected with first amplifier with said transmitting mixer respectively, is used for the signal of after said transmitting mixer mixing, exporting is carried out Filtering Processing, sends frequency sweep and transmits.
3. non-linear node detector according to claim 1 and 2 is characterized in that, said non-linear node detector operation frequency band is 800MHz-4GHz.
4. non-linear node detector according to claim 1 is characterized in that, it is continuous DC level that said mixer output signal is handled the back through filtering, amplification and detection.
5. non-linear node detector according to claim 1 is characterized in that, said echoed signal is the self-excitation echo of the non-linear node of said electronic target.
6. non-linear node detector according to claim 2 is characterized in that said sweep generator is the DDS compositor.
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| CN2010106058351A CN102540262B (en) | 2010-12-27 | 2010-12-27 | Nonlinear node detector |
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| CN2010106058351A CN102540262B (en) | 2010-12-27 | 2010-12-27 | Nonlinear node detector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869306A (en) * | 2012-12-12 | 2014-06-18 | 中国电子科技集团公司第五十研究所 | Metal and non-linear object composite detector |
| CN104849764A (en) * | 2015-05-26 | 2015-08-19 | 上海海潮新技术研究所 | Array non-linear object detection system and method |
| CN107294638A (en) * | 2016-03-31 | 2017-10-24 | 北京中密安信息安全技术有限公司 | Environmental security detection method |
| CN109204142A (en) * | 2018-10-26 | 2019-01-15 | 吉利汽车研究院（宁波）有限公司 | A kind of the pedestrian's identification auxiliary system and method for vehicle |
| CN110068872A (en) * | 2019-04-07 | 2019-07-30 | 佛山市南海区多盟电子仪器有限公司 | Single probe electromagnetic induction type metal list biplate identifier |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87212860U (en) * | 1987-12-22 | 1988-10-26 | 邢善忠 | Multifunctional tester |
| US4935744A (en) * | 1988-04-14 | 1990-06-19 | U.S. Philips Corporation | Coherent radar |
| EP0886149A2 (en) * | 1997-06-18 | 1998-12-23 | Honda Giken Kogyo Kabushiki Kaisha | Frequency-modulated continuous-wave radar system |
| US20040239555A1 (en) * | 2002-06-14 | 2004-12-02 | Dirk Steinbuch | Method and apparatus for generating HF signals for determining a distance and/or a speed of an object |
| CN1632474A (en) * | 2004-12-23 | 2005-06-29 | 太原理工大学 | Non-linear evolutional correction method for levelmeter of linear frequency-modulation radar |
| WO2006035199A1 (en) * | 2004-09-28 | 2006-04-06 | Qinetiq Limited | Frequency modulated continuous wave (fmcw) radar having improved frequency sweep linearity |
| CN2831266Y (en) * | 2005-09-29 | 2006-10-25 | 中国电子科技集团公司第五十研究所 | Receiving module having Doppler frequency inhibitory function |
| CN1852062A (en) * | 2005-12-22 | 2006-10-25 | 华为技术有限公司 | Apparatus and method for detecting antenna feedback fault point of narrow-band base-station system |
| CN101458326A (en) * | 2007-12-14 | 2009-06-17 | 南京理工大学 | Life detecting device based on pseudocode phase-modulated continuous wave system |
-
2010
- 2010-12-27 CN CN2010106058351A patent/CN102540262B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87212860U (en) * | 1987-12-22 | 1988-10-26 | 邢善忠 | Multifunctional tester |
| US4935744A (en) * | 1988-04-14 | 1990-06-19 | U.S. Philips Corporation | Coherent radar |
| EP0886149A2 (en) * | 1997-06-18 | 1998-12-23 | Honda Giken Kogyo Kabushiki Kaisha | Frequency-modulated continuous-wave radar system |
| US20040239555A1 (en) * | 2002-06-14 | 2004-12-02 | Dirk Steinbuch | Method and apparatus for generating HF signals for determining a distance and/or a speed of an object |
| WO2006035199A1 (en) * | 2004-09-28 | 2006-04-06 | Qinetiq Limited | Frequency modulated continuous wave (fmcw) radar having improved frequency sweep linearity |
| CN1632474A (en) * | 2004-12-23 | 2005-06-29 | 太原理工大学 | Non-linear evolutional correction method for levelmeter of linear frequency-modulation radar |
| CN2831266Y (en) * | 2005-09-29 | 2006-10-25 | 中国电子科技集团公司第五十研究所 | Receiving module having Doppler frequency inhibitory function |
| CN1852062A (en) * | 2005-12-22 | 2006-10-25 | 华为技术有限公司 | Apparatus and method for detecting antenna feedback fault point of narrow-band base-station system |
| CN101458326A (en) * | 2007-12-14 | 2009-06-17 | 南京理工大学 | Life detecting device based on pseudocode phase-modulated continuous wave system |
Non-Patent Citations (1)
| Title |
|---|
| 王立巍: "扫频仪频谱分析功能的开发及应用", 《徐州师范大学学报(自然科学版)》, no. 04, 20 December 1999 (1999-12-20) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869306A (en) * | 2012-12-12 | 2014-06-18 | 中国电子科技集团公司第五十研究所 | Metal and non-linear object composite detector |
| CN103869306B (en) * | 2012-12-12 | 2016-01-06 | 中国电子科技集团公司第五十研究所 | Metal and Nonlinear Parameter composite detecting device |
| CN104849764A (en) * | 2015-05-26 | 2015-08-19 | 上海海潮新技术研究所 | Array non-linear object detection system and method |
| CN107294638A (en) * | 2016-03-31 | 2017-10-24 | 北京中密安信息安全技术有限公司 | Environmental security detection method |
| CN107294638B (en) * | 2016-03-31 | 2019-04-09 | 北京中密安信息安全技术有限公司 | Environmental security detection method |
| CN109204142A (en) * | 2018-10-26 | 2019-01-15 | 吉利汽车研究院（宁波）有限公司 | A kind of the pedestrian's identification auxiliary system and method for vehicle |
| CN110068872A (en) * | 2019-04-07 | 2019-07-30 | 佛山市南海区多盟电子仪器有限公司 | Single probe electromagnetic induction type metal list biplate identifier |
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| CN102540262B (en) | 2013-10-30 |
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