CN102540262B - Nonlinear node detector - Google Patents
Nonlinear node detector Download PDFInfo
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- CN102540262B CN102540262B CN2010106058351A CN201010605835A CN102540262B CN 102540262 B CN102540262 B CN 102540262B CN 2010106058351 A CN2010106058351 A CN 2010106058351A CN 201010605835 A CN201010605835 A CN 201010605835A CN 102540262 B CN102540262 B CN 102540262B
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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 security protection Detection Techniques field, specifically, the present invention relates to a kind of nonlinear node detector.
Background technology
In security protection Detection Techniques field, nonlinear 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. may bring personal safety and information security hidden danger, can be widely used in the security protection detection field in place, all kinds of key.
Electronic installation generally is comprised of electronic circuit, and the fundamental element of electronic circuit is 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 nonlinear node.Along with the fast development of electronics industry, a large amount of diode, triode and integrated circuit of using on various electronic installations are so that exist one or more nonlinear nodes in these electronic installations.Nonlinear node detector is exactly to send frequency electromagnetic waves in the zone of searching, excite the self-excitation echo on the nonlinear node in the various electronic installations, then capture various self-excitation echoes with the receiver on the nonlinear node detector, to reach the purpose that electronic target is surveyed, located, at present all widespread uses at home and abroad.
Yet; progress along with electronic science and technology; there is a large amount of electronic installations to come into operation in the at present activity in production; also there are in addition a large amount of mixed and disorderly electromagnetic wave signals in the surroundings background; also have other electromagnetic signal of a large amount of various frequencies near the frequency band that nonlinear node detector is worked (being generally 800MHz-4GHz); this type of useless signal often disturbs the normal operation of nonlinear node detector, causes false-alarm.Existing nonlinear node detector is generally a nonlinear node detector of frequency system, its point that sends 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 affect the normal operation of this nonlinear node detector.In fact, because the frequency of the undesired signal that exists in the environmental background is varied, the existing frequently nonlinear node detector of system is difficult to find one and just in time avoids the frequency that all undesired signals affect, survey the electronic target that may bring personal safety and information security hidden danger, be that existing nonlinear node detector can't work in the electromagnetic environment of disturbing, affected 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 nonlinear node detector that adopts the frequency sweep system, can effectively avoid the Electromagnetic Interference signal in the environmental background, improves the detection performance to electronic target, reduces false alarm rate.
For solving the problems of the technologies described above, the invention provides a kind of nonlinear node detector, be used for surveying electronic target, comprising:
Signal processing terminal unit;
The swept-frequency signal generating unit is connected with described signal processing terminal unit, is used for sending frequency sweep according to the indication of described signal processing terminal unit and transmits;
The first amplifier is connected with described swept-frequency signal generating unit, for amplification that described frequency sweep is transmitted;
Emitting antenna is connected with described the first amplifier, transmits for the frequency sweep with described amplification and launches;
Receiving antenna is used for receiving echoed signal;
The second amplifier is connected with described receiving antenna, is used for described echoed signal is amplified;
Frequency sweep receives the local oscillator unit, is connected with described signal processing terminal unit, is used for sending the frequency sweep reception local oscillation signal that transmits and change synchronously with described frequency sweep according to the indication of described signal processing terminal unit;
Receiving mixer receives the local oscillator unit with described the second amplifier and frequency sweep respectively and is connected, and is used for echoed signal and the frequency sweep of described amplification are received the local oscillation signal mixing, forms mixer output signal; And
The mixed frequency signal processing unit, be connected with signal processing terminal unit with described receiving mixer respectively, being used for that described mixer output signal is carried out filtering, amplification and detection processes, then send to described signal processing terminal unit, judge whether described echoed signal is sent by described electronic target.
Alternatively, described swept-frequency signal generating unit comprises:
Sweep generator is connected with described signal processing terminal unit, is used for producing swept-frequency signal according to the indication of described signal processing terminal unit;
Phase-locked local vibration source is connected with described signal processing terminal unit, is used for producing fixedly point-frequency signal according to the indication of described signal processing terminal unit;
Transmitting mixer is connected with phase-locked local vibration source with described sweep generator respectively, is used for described swept-frequency signal and fixedly point-frequency signal mixing; And
Wave filter is connected with the first amplifier with described transmitting mixer respectively, is used for that the signal of exporting is carried out filtering and processes after described transmitting mixer mixing, sends frequency sweep and transmits.
Alternatively, the working band of described nonlinear node detector is 800MHz-4GHz.
Alternatively, described mixer output signal is continuous DC level after processing through filtering, amplification and detection.
Alternatively, described echoed signal is the self-excitation echo of the nonlinear node of described electronic target.
Alternatively, described sweep generator is the DDS compositor.
Compared with prior art, the present invention has the following advantages:
The present invention is by surveying existence and the position of electronic target with swept-frequency signal, because the level nature of the mixer output signal that the level nature of the mixer output signal that detector obtains when having electronic target to exist obtains when only undesired signal being arranged is fully not identical, can judge easily echoed signal be send for electronic target or for undesired signal, can effectively avoid the interference of other electromagnetic wave signal in the environmental background, raising reduces false alarm rate to the detection performance of electronic target.
Description of drawings
The above and other features of the present invention, character and advantage will become more obvious by the description below in conjunction with drawings and Examples, wherein:
Fig. 1 is the structured flowchart of the nonlinear node detector of one embodiment of the invention;
Fig. 2 is the structured flowchart of swept-frequency signal generating unit of the nonlinear node detector of one embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with specific embodiments and the drawings, but should not limit protection scope of the present invention with this.
Fig. 1 is the structured flowchart of the nonlinear node detector of one embodiment of the invention.As shown in the figure, this nonlinear node detector 200 can be used for surveying 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;
The first amplifier 203 is connected with swept-frequency signal generating unit 202, for amplification that frequency sweep is transmitted;
Emitting antenna 204 is connected with the first amplifier 203, and the frequency sweep that is used for amplifying transmits and launches;
Receiving antenna 205 is used for receiving echoed signal;
The second amplifier 206 is connected with receiving antenna 205, is used for echoed signal is amplified;
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 the second amplifier 206 and frequency sweep respectively and is connected, and the echoed signal and the frequency sweep that are used for amplifying receive the local oscillation signal mixing, form 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 process, then send to signal processing terminal unit 201, judge whether echoed signal is sent by electronic target.
Fig. 2 is the structured flowchart of swept-frequency signal generating unit of the nonlinear 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;
Phase-locked 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 is connected with phase-locked local vibration source 2022 with sweep generator 2021 respectively, is used for swept-frequency signal and fixedly point-frequency signal mixing; And
In the present embodiment, the working band of nonlinear node detector can be 800MHz-4GHz.
In the present embodiment, if the received echoed signal of detector is the self-excitation echo of the nonlinear 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 processing through filtering, amplification and detection; If the received echoed signal of detector is undesired signal, then this moment, mixer output signal can not be fixed frequency, perhaps can not exist all the time owing to undesired signal, it is through filtering, amplification and detection can not be a continuous DC level after processing, and should be a short pulse signal, the level nature of the mixer output signal that its detector when having electronic target to exist obtains is fully not identical, can judge easily this echoed signal be send for electronic target or for undesired signal, determine whether have suspicious electronic target in the current region, effectively reduce false alarm rate with this.
In the present embodiment, sweep generator can be the DDS compositor, again in conjunction with the use of phase-locked local vibration source, can guarantee frequency accuracy and the sweep velocity of the swept-frequency signal that produces.The DDS technology has that frequency resolution is little, frequency inverted speed is fast, volume is little, integrated level is high, design and use the characteristics such as convenient, can control easily its output frequency by the signal processing terminal.Producing the needed frequency sweep of detector after the fixedly point-frequency signal mixing of the accurate swept-frequency signal of frequency that the DDS compositor produces and the output of phase-locked local vibration source, the filtering transmits.
Detector adopts to follow the tracks of to receive working method when work.Detector enters receiving mixer after the electronic target echoed signal that receiving antenna receives is amplified through the second amplifier.Frequency sweep reception local oscillator unit is subjected to 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 is by surveying existence and the position of electronic target with swept-frequency signal, because the level nature of the mixer output signal that the level nature of the mixer output signal that detector obtains when having electronic target to exist obtains when only undesired signal being arranged is fully not identical, can judge easily echoed signal be send for electronic target or for undesired signal, can effectively avoid the interference of other electromagnetic wave signal in the environmental background, raising is to the detection performance of electronic target, reduce false alarm rate, satisfy the use needs that current safety is surveyed.
Although the present invention with preferred embodiment openly as above; but it is not to limit the present invention; any those skilled in the art without departing 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 (5)
1. a nonlinear node detector is used for surveying electronic target, comprising:
Signal processing terminal unit;
The swept-frequency signal generating unit is connected with described signal processing terminal unit, is used for sending frequency sweep according to the indication of described signal processing terminal unit and transmits;
The first amplifier is connected with described swept-frequency signal generating unit, for amplification that described frequency sweep is transmitted;
Emitting antenna is connected with described the first amplifier, transmits for the frequency sweep with described amplification and launches;
Receiving antenna is used for receiving echoed signal;
The second amplifier is connected with described receiving antenna, is used for described echoed signal is amplified;
Frequency sweep receives the local oscillator unit, is connected with described signal processing terminal unit, is used for sending the frequency sweep reception local oscillation signal that transmits and change synchronously with described frequency sweep according to the indication of described signal processing terminal unit;
Receiving mixer receives the local oscillator unit with described the second amplifier and frequency sweep respectively and is connected, and is used for echoed signal and the frequency sweep of described amplification are received the local oscillation signal mixing, forms mixer output signal; And
The mixed frequency signal processing unit, be connected with signal processing terminal unit with described receiving mixer respectively, being used for that described mixer output signal is carried out filtering, amplification and detection processes, then send to described signal processing terminal unit, judge whether described echoed signal is sent by described electronic target;
Wherein, described swept-frequency signal generating unit comprises:
Sweep generator is connected with described signal processing terminal unit, is used for producing swept-frequency signal according to the indication of described signal processing terminal unit;
Phase-locked local vibration source is connected with described signal processing terminal unit, is used for producing fixedly point-frequency signal according to the indication of described signal processing terminal unit;
Transmitting mixer is connected with phase-locked local vibration source with described sweep generator respectively, is used for described swept-frequency signal and fixedly point-frequency signal mixing; And
Wave filter is connected with the first amplifier with described transmitting mixer respectively, is used for that the signal of exporting is carried out filtering and processes after described transmitting mixer mixing, sends frequency sweep and transmits.
2. nonlinear node detector according to claim 1 is characterized in that, the working band of described nonlinear node detector is 800MHz-4GHz.
3. nonlinear node detector according to claim 1 is characterized in that, described mixer output signal is continuous DC level after processing through filtering, amplification and detection.
4. nonlinear node detector according to claim 1 is characterized in that, described echoed signal is the self-excitation echo of the nonlinear node of described electronic target.
5. nonlinear node detector according to claim 1 is characterized in that, described 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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| 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 |
| 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 |
| CN110068872B (en) * | 2019-04-07 | 2020-08-21 | 佛山市南海区多盟电子仪器有限公司 | Single probe electromagnetic induction type metal single-double sheet recognizer |
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