CN103176181A - Nonlinear node detector of frequency modulation continuous wave system - Google Patents
Nonlinear node detector of frequency modulation continuous wave system Download PDFInfo
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- CN103176181A CN103176181A CN2011104310130A CN201110431013A CN103176181A CN 103176181 A CN103176181 A CN 103176181A CN 2011104310130 A CN2011104310130 A CN 2011104310130A CN 201110431013 A CN201110431013 A CN 201110431013A CN 103176181 A CN103176181 A CN 103176181A
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Abstract
The invention provides a nonlinear node detector of a frequency modulation continuous wave system. The nonlinear node detector comprises a modulation signal generator used for generating modulation signals, a voltage-controlled oscillator controlled by the modulation signals to generate continuous wave frequency modulation signals, a frequency multiplier used for multiplying the continuous wave frequency modulation signals, a first amplifier used for amplifying the continuous wave frequency modulation signals, a transmitting antenna, a receiving antenna used for receiving echo signals, a second amplifier used for amplifying the echo signals, a mixer utilizing the multiplied continuous wave frequency modulation signals as local oscillator signals and mixing the amplified echo signals with the local oscillator signals to generate beat signals, a filter used for filtering the beat signals, a third amplifier used for amplifying the filtered beat signals and a digital signal processing terminal used for processing the beat signals, analyzing frequency and size of the beat signals, determining whether an electronic target exists in a detection area or not and calculating the distance between the electronic target and the detector. The nonlinear node detector can effectively avoid electromagnetic wave interference signals in environment background, improves detection performance of the electronic target and reduces false alarm rate.
Description
Technical field
The present invention relates to security protection Detection Techniques fields, specifically, the present invention relates to a kind of nonlinear node detector that adopts the Continuous Wave with frequency modulation system.
Background technology
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, make and have one or more nonlinear nodes in these electronic installation on various 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 various electronic installations, then capture various self-excitation echoes with the receiver on nonlinear node detector, 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 activity in production at present; 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 environmental background, 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 environmental background is varied, the existing nonlinear node detector of system frequently is difficult to find one and just in time avoids the frequency that all undesired signals affect, and surveys the electronic target that may bring personal safety and information security hidden danger.Namely at present existing common nonlinear node detector can't work in the electromagnetic environment of disturbing with in having the complicated environment for use of electronic equipment, has 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 is to provide a kind of nonlinear node detector that adopts the Continuous Wave with frequency modulation system, can effectively avoid the Electromagnetic Interference signal in 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 of Continuous Wave with frequency modulation system, be used for surveying electronic target, comprising:
Modulation signal generator is for generation of the time dependent modulation signal of frequency;
Voltage controlled oscillator is connected with described modulation signal generator, is used for being subjected to described modulation signal to control and produces the continuous wave frequency signal;
Frequency multiplier is connected with described voltage controlled oscillator, is used for described continuous wave frequency signal frequency multiplication;
The first amplifier is connected with described voltage controlled oscillator, is used for described continuous wave frequency signal is amplified;
Emitting antenna is connected with described the first amplifier, is used for described continuous wave frequency signal is launched;
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 mixer is connected with described the second amplifier with described frequency multiplier respectively, be used for the described continuous wave frequency signal after frequency multiplication as local oscillation signal, with amplify after described echoed signal mixing, produce Beat Signal;
Wave filter is connected with described frequency mixer, is used for described Beat Signal is carried out filtering;
The 3rd amplifier is connected with described wave filter, is used for filtered described Beat Signal is amplified; And
The digital signal processing terminal, be connected with described the 3rd amplifier with modulation signal generator respectively, be used for described Beat Signal is processed, analyze the frequency and size of described Beat Signal, determine the position that whether has electronic target to exist and calculate the described detector of described electronic target distance in search coverage.
Alternatively, described modulation signal generator is triangular-wave generator.
Alternatively, described voltage controlled oscillator is all solid state voltage controlled oscillator.
Alternatively, described echoed signal is the self-excitation echo of the nonlinear node of described electronic target.
Alternatively, the working band of described nonlinear node detector is 800MHz-4GHz.
Compared with prior art, the present invention has the following advantages:
The nonlinear node detector of Continuous Wave with frequency modulation system of the present invention adopts the frequency modulation emission and synchronizes the reception working method, makes nonlinear node detector can avoid undesired signal in the electromagnetic environment background, reduces the false alarm rate of existing nonlinear node detector.Simultaneously, the nonlinear node detector of Continuous Wave with frequency modulation system of the present invention has the target range positioning function, by can effectively distinguishing search coverage echo signal and annex electronic equipment interference echo signal to the Distance Judgment of signal, can effectively reduce the detection false alarm rate.
The present invention 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 safety detection field, place, all kinds of key.
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 modular structure figure of nonlinear node detector of the Continuous Wave with frequency modulation system of one embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with specific embodiments and the drawings; set forth in the following description more details so that fully understand the present invention; but the present invention obviously can implement with the multiple alternate manner that is different from this description; those skilled in the art can be in the situation that do similar popularization, deduction without prejudice to intension of the present invention according to practical situations, therefore should be with content constraints protection scope of the present invention of this specific embodiment.
Fig. 1 is the modular structure figure of nonlinear node detector of the Continuous Wave with frequency modulation system of one embodiment of the invention.As shown in Figure 1, the working band of this nonlinear node detector 100 can be between 800MHz-4GHz, can be used for surveying electronic target, comprising: modulation signal generator 101, voltage controlled oscillator 102, frequency multiplier 103, the first amplifier 104, emitting antenna 105, receiving antenna 106, the second amplifier 107, frequency mixer 108, wave filter 109, the 3rd amplifier 110 and digital signal processing terminal 111.
Wherein, modulation signal generator 101 can be triangular-wave generator, for generation of the time dependent modulation signal of frequency.Voltage controlled oscillator 102 can be all solid state voltage controlled oscillator, is connected with modulation signal generator 101, is used for being modulated signal controlling and produces the continuous wave frequency signal.Frequency multiplier 103 is connected with voltage controlled oscillator 102, is used for the continuous wave frequency signal frequency multiplication.The first amplifier 104 is connected with voltage controlled oscillator 102, is used for the continuous wave frequency signal is amplified.Emitting antenna 105 is connected with the first amplifier 104, is used for the continuous wave frequency signal is launched.Receiving antenna 106 is used for receiving echoed signal, and this echoed signal is specifically as follows the self-excitation echo of the nonlinear node of electronic target.The second amplifier 107 is connected with receiving antenna 106, is used for echoed signal is amplified.Frequency mixer 108 is connected with the second amplifier 107 with frequency multiplier 103 respectively, be used for the continuous wave frequency signal after frequency multiplication as local oscillation signal, with amplify after the echoed signal mixing, produce Beat Signal.Wave filter 109 is connected with frequency mixer 108, is used for Beat Signal is carried out filtering.The 3rd amplifier 110 is connected with wave filter 109, is used for filtered Beat Signal is amplified.Digital signal processing terminal 111 is connected with the 3rd amplifier 110 with modulation signal generator 101 respectively, be used for Beat Signal is processed, whether analyze the frequency and size of Beat Signal, determining has electronic target to have and calculate the position of electronic target range finder 100 in search coverage.
The below briefly describes the principle of work of nonlinear node detector 100 of the present invention:
Voltage controlled oscillator 102 in the present invention can be an all solid state voltage controlled oscillator, is modulated signal controlling and produces the continuous wave frequency signal.The sub-fraction of this signal is through frequency multiplier 103 frequencys multiplication, and as the local oscillation signal of receiving mixer 108, most of energy is launched by emitting antenna 105 after amplifying by the first amplifier 104.The received antenna 106 of echoed signal is fed to frequency mixer 108 after receiving and amplifying by the second amplifier 107, and produces Beat Signal after the local oscillation signal mixing.Beat Signal exports digital signal processing terminal 111 through wave filter 109 filtering, the 3rd amplifier 110 to after amplifying.111 pairs of signals of digital signal processing terminal are processed, and analyze the frequency and size of current Beat Signal, to determine whether the position that has electronic target to exist and calculate the target range detector in search coverage.
The nonlinear node detector of the Continuous Wave with frequency modulation system in the present invention, launch a time dependent signal of frequency, the nonlinear node echoed signal of its reception is to synchronize the frequency-doubled signal that changes with emission signal frequency, compares after the emission signal frequency frequency multiplication of the current frequency of echoed signal and current detector to have the time delay consistent with detection range.The frequency-doubled signal that the nonlinear node detector of Continuous Wave with frequency modulation system of the present invention transmits is the current goal function of time delay with the difference frequency output that receives signal, thereby be also the function of target range, by being analyzed, the frequency of current Beat Signal just can obtain search coverage internal object range finder position.
During nonlinear node detector work of the present invention, launch the signal that a frequency is changing according to certain rules in time, receive frequency-doubled signal and the Beat Signal of launching frequency-doubled signal, the detection of a target can be judged whether to exist by the Beat Signal size, detection of a target distance can be measured time delay by the Beat Signal frequency is calculated.The present invention is owing to having adopted emission and having received correlation processing technique, and it is very narrow that nonlinear node detector receives intermediate-frequency bandwidth, and general undesired signal can't fall into and cause interference in bandwidth, effectively reduces and surveys false alarm rate.
Continuous Wave with frequency modulation system nonlinear node detector of the present invention can be analyzed detected target range finder distance, in complicated field of employment, its target range of nonlinear echoes undesired signal that near detector electronic equipment produces is far longer than detector and answers the search coverage distance, therefore can effectively reduce the detection false alarm rate by the Distance Judgment to signal.
The nonlinear node detector of Continuous Wave with frequency modulation system of the present invention can be analyzed detected target range finder distance, in complicated field of employment, its target range of nonlinear echoes undesired signal that near detector electronic equipment produces is far longer than detector and answers the search coverage distance, therefore can effectively reduce the detection false alarm rate by the Distance Judgment to signal.
In sum, the nonlinear node detector of Continuous Wave with frequency modulation system of the present invention adopts the frequency modulation emission and synchronizes the reception working method, make nonlinear node detector have advantages of strong anti-interference performance, can avoid undesired signal in the electromagnetic environment background, reduce the false alarm rate of existing nonlinear node detector.Simultaneously, the nonlinear node detector of Continuous Wave with frequency modulation system of the present invention has the target range positioning function, by can effectively distinguishing search coverage echo signal and annex electronic equipment interference echo signal to the Distance Judgment of signal, can effectively reduce the detection false alarm rate, improve the detection performance of such detecting devices, satisfy the needs that current safety is surveyed.The present invention has practicality and economy preferably.
The present invention 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 safety detection field, place, all kinds of key.
Although the present invention with preferred embodiment openly as above, it is not to limit the present invention, and any those skilled in the art can make possible change and modification without departing from the spirit and scope of the present invention.Therefore, every content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any modification, equivalent variations and modification that above embodiment does, within all falling into the protection domain that claim of the present invention defines.
Claims (5)
1. the nonlinear node detector of a Continuous Wave with frequency modulation system (100), be used for surveying electronic target, comprising:
Modulation signal generator (101) is for generation of the time dependent modulation signal of frequency;
Voltage controlled oscillator (102) is connected with described modulation signal generator (101), is used for being subjected to described modulation signal to control and produces the continuous wave frequency signal;
Frequency multiplier (103) is connected with described voltage controlled oscillator (102), is used for described continuous wave frequency signal frequency multiplication;
The first amplifier (104) is connected with described voltage controlled oscillator (102), is used for described continuous wave frequency signal is amplified;
Emitting antenna (105) is connected with described the first amplifier (104), is used for described continuous wave frequency signal is launched;
Receiving antenna (106) is used for receiving echoed signal;
The second amplifier (107) is connected with described receiving antenna (106), is used for described echoed signal is amplified;
Frequency mixer (108), be connected with described the second amplifier (107) with described frequency multiplier (103) respectively, be used for the described continuous wave frequency signal after frequency multiplication as local oscillation signal, with amplify after described echoed signal mixing, produce Beat Signal;
Wave filter (109) is connected with described frequency mixer (108), is used for described Beat Signal is carried out filtering;
The 3rd amplifier (110) is connected with described wave filter (109), is used for filtered described Beat Signal is amplified;
Digital signal processing terminal (111), be connected with described the 3rd amplifier (110) with modulation signal generator (101) respectively, be used for described Beat Signal is processed, analyze the frequency and size of described Beat Signal, determine the position that whether has electronic target to exist and calculate the described electronic target described detector of distance (100) in search coverage.
2. nonlinear node detector according to claim 1 (100), is characterized in that, described modulation signal generator (101) is triangular-wave generator.
3. nonlinear node detector according to claim 1 and 2 (100), is characterized in that, described voltage controlled oscillator (102) is all solid state voltage controlled oscillator.
4. nonlinear node detector according to claim 3 (100), 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 4 (100), is characterized in that, the working band of described nonlinear node detector (100) is 800MHz-4GHz.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| CN109725305A (en) * | 2019-01-02 | 2019-05-07 | 公安部第一研究所 | A kind of ultra wideband radar system of Low Power High Performance |
| CN110567556A (en) * | 2019-10-30 | 2019-12-13 | 北京锐达仪表有限公司 | Frequency modulation continuous wave radar level meter for measuring material level in container |
| CN111044999A (en) * | 2018-10-12 | 2020-04-21 | 安讯士有限公司 | Method, apparatus and system for interference reduction in frequency modulated continuous wave radar units |
| CN111856439A (en) * | 2020-07-17 | 2020-10-30 | 深圳市安卫普科技有限公司 | Nonlinear node detection method and detector |
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| CN111044999B (en) * | 2018-10-12 | 2024-04-19 | 安讯士有限公司 | Method, equipment and system for reducing interference in frequency modulation continuous wave radar unit |
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| CN111856439A (en) * | 2020-07-17 | 2020-10-30 | 深圳市安卫普科技有限公司 | Nonlinear node detection method and detector |
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Application publication date: 20130626 |