CN104090305A - Non-imaging type and not-contact type microwave security inspection device and method based on microwave radars - Google Patents
Non-imaging type and not-contact type microwave security inspection device and method based on microwave radars Download PDFInfo
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Abstract
The invention discloses a non-imaging type and not-contact type microwave security inspection device and a non-imaging type and not-contact type microwave security inspection method based on microwave radars, which belong to the technical field of security inspection equipment. The non-imaging type and not-contact type microwave security inspection device comprises a plurality of detection units and a warning unit, wherein the plurality of the detection units are respectively connected with the warning unit; each detection unit comprises a microwave radar, an intermediate-frequency circuit, a signal acquisition circuit and a signal processing circuit, which are connected with one another in sequence; the warning unit comprises a warning circuit. By virtue of the device, metal contraband and non-metal contraband, which are hidden in clothes of human bodies, can be detected under non-contact and non-imaging conditions; the device has the advantages of high detection accuracy and low cost, and the technical complexity of the device is far lower than that of imaging type microwave security inspection equipment; all the elements of the device can be independently manufactured in China.
Description
Technical field
The invention belongs to rays safety detection apparatus technical field, be specifically related to a kind of non-imaging type, non-contact microwave safety check apparatus and method based on microwave radar.
Background technology
Handheld metal detector and metal detector gate that the important place such as existing airport, railway station, subway is used, the principle based on electromagnetic induction, can be to the metal of hiding under human body clothing contraband goods processed-make detection as cutter, gun etc.; But, for various modern nonmetal contraband goodss (as Stupalox, plastics rifle, liquid explosive, slurry explosives etc.), existing Handheld metal detector and metal detector gate based on electromagnetic induction principle cannot be made detection, brings major safety risks.
Due to the sternness of anti-terrorism form both at home and abroad, and the shortcoming of existing metal detection safety check apparatus, in the urgent need to new safety check technology and method, occur.
In various optional advanced technology schemes, infrared human body safety check can not penetrate the clothing that human body is thick and heavy, X-ray safety check instrument is known from experience the injury that causes radiation to people, by contrast, microwave (300MHz～3000GHz) has the ability that penetrates the thick and heavy clothing of human body, not only to metal contraband goods, and to nonmetal contraband goods, as plastics gun, sintex, slurry explosives etc., can from human body background, significantly distinguish, it is also far smaller than mobile phone radiation to the radiation of human body simultaneously, is easy to accepted by the public.Applied microwave technology in human body safety check technology, developed greatly, utilized large-scale microwave-millimeter wave (26.5GHz～300GHz) imager abroad, can be simultaneously to hiding metal under human body clothing and nonmetal contraband goods detects, microwave human body safety check technical elements at point blank (0.5～1 meter), U.S. communications and transportation office (TSA) from 2008, come into operation on each large airport of U.S. millimeter wave (35GHz/94GHz) the holographic imaging security check system product of U.S. L-3 company of approved; At the microwave human body safety check technical elements of (1～5 meter) closely, the important events application such as passive millimeter wave (35GHz) the imaging safe examination system product Yi customs of U.S. Brijot company.
In above-mentioned short range safety check technical field, although microwave-millimeter wave holographic imaging security check system product can carry out imaging detection, obtain higher identification probability, the cost costliness of its equipment, technical sophistication, be difficult to large-scale promotion, can only be applied to the important events such as airport; And although other microwave imaging safe examination system products can detect in imaging, but the equipment cost that has equally microwave holography imaging safe examination system product is expensive, technical sophistication and cause be difficult to the difficult problem that large-scale promotion is used, and it is often restricted in indoor application.In sum, imager equipment is complex structure, bulky not only, and technical difficulty is large, expensive, conventionally needs fixed installation to use, and the domestic correlation technique with independent intellectual property right that there is no at present.
Non-imaging based on microwave radar, contactless short range human body safety check equipment and technology are all not yet to have abroad or at home application at present.
Through retrieval, China Patent No. ZL200410091183.9, Granted publication day is on January 23rd, 2008, invention and created name is: impulse excitation electromagnetic resonance safety inspection method and device, this application case relates to a kind of impulse excitation electromagnetic resonance safety inspection method and device, belongs to electromagnetic nondestructive testing field.For the weak points such as radiation hazard of prior art, this application case is theoretical according to electromagnetic nondestructive, has proposed a kind of impulse excitation electromagnetic resonance safety inspection method and device thereof.Be different from traditional safety inspection method, adopt the drive coil of transient state high energy impact excitation, in space, set up a decay oscillating magnetic field, in order to the coil that detects of aware space magnetic field violent change, through signal processing circuit, be connected with warning circuit.Harm that this application case is radiationless, can be in real time sensitive detect ferromagnetic object, by regulating alarming threshold value, to adapt to different safety check demands.But this application case is from the attenuation process of signal, to extract needed signal, detected space magnetic field is changed comparatively responsive, and only just can there is violent change at ferromagnetic object through out-of-date in space magnetic field, and then cause detecting the impedance variation of coil, ferromagnetic object is detected, but cannot detect the contraband goods of nonferromagnetic, still leave over very large potential safety hazard.
Summary of the invention
1. the technical matters that invention will solve
The object of the invention is to overcome hand-held safety check instrument, the detector gate based on electromagnetic induction in prior art and can not detect the deficiency that human body is hidden nonmetal contraband goods, a kind of non-imaging type, non-contact microwave safety check apparatus and method based on microwave radar is provided, adopt technical scheme of the present invention, it is on cost and technical complexity, far below imaging type microwave rays safety detection apparatus, be more conducive to large-scale promotion and use.
2. technical scheme
For achieving the above object, technical scheme provided by the invention is:
A kind of non-imaging type based on microwave radar, non-contact microwave safety check apparatus, comprise a plurality of detecting units and the unit of warning, described a plurality of detecting units are connected with the unit of warning respectively, described detecting unit comprises the microwave radar connecting in turn, intermediate-frequency circuit, signal acquisition circuit and signal processing circuit, the described unit of warning comprises the circuit of warning, described microwave radar is for launched microwave and receive the signal that tested target is reflected back, described intermediate-frequency circuit is for carrying out filtering to the signal of microwave radar output, intermediate frequency amplifies, detection and low frequency amplify, described signal acquisition circuit is for carrying out collection of simulant signal to the low frequency signal of intermediate-frequency circuit output, pre-service, analog-digital conversion and digital signal input, described signal processing circuit is for carrying out feature extraction to the digital signal of signal acquisition circuit input, relatively with identification, and make and warning and non-judgement of warning according to radar echo signal database and thresholding, the described circuit of warning provides and warns for the judgement of warning that signal processing circuit is made.
Microwave radar in each described detecting unit is linear array and arranges.
The transmitting branch of described microwave radar comprises microwave source, modulator, voltage controlled oscillator, power amplifier and emitting antenna, receiving branch comprises receiving antenna, low noise amplifier and frequency mixer, described microwave source is connected with modulator, described modulator respectively with voltage controlled oscillator, frequency mixer connects, described voltage controlled oscillator, power amplifier is connected successively with emitting antenna, described receiving antenna, low noise amplifier is connected successively with frequency mixer, the microwave of microwave source transmitting produces modulation signal through modulator, the voltage controlled oscillator that is loaded into low-power consumption produces microwave continuous ripple signal, through power division, become two-way, one tunnel enters frequency mixer as local oscillation signal, amplify by emitting antenna to tested human-body emitting through power amplifier on another road, the microwave signal of transmitting penetrates human body clothing, run into after body surface or concealment contraband goods, reflect, after receiving antenna receives, input low noise amplifier amplifies, then enter frequency mixer and local oscillation signal and carry out mixing, output packet is containing the continuous wave signal of tested human body information.
Described intermediate-frequency circuit comprises wave filter, intermediate frequency amplifier, wave detector and the low-frequency amplifier connecting in turn.
Described signal acquisition circuit comprises analog signal input circuit, pre-process circuit, analog to digital conversion circuit and the digital signal input circuit connecting in turn.
Described signal processing circuit adopts digital signal processing circuit.
The described circuit of warning is comprised of sound, light or vibration transducer.
Non-imaging type based on microwave radar, a non-contact microwave safety inspection method, comprise the steps:
1) open microwave safety check apparatus, human body enters Mag & Bag Area and safety check apparatus in a distance, keeps relatively static or relative motion;
2) be a plurality ofly microwave radar launched microwave that linear array arranges and tested person's body is formed to one dimension wave beam cover, and advancing or the another motion in one dimension of a plurality of microwave radars by human body self, realization is surveyed the whole body of two-dimension human body or partial sweep, detection completes the continuous wave signal that back reflection returns and enters successively intermediate-frequency circuit, signal acquisition circuit and signal processing circuit, through signal processing circuit, identifies and judges whether human body hides contraband goods;
3) if human body concealment metal or nonmetal contraband goods, the mode visible, that can examine such as circuit employing sound, light, vibration of warning is warned, security staff puts in isolation and under investigation tested human body, if human body is not hidden metal or nonmetal contraband goods, the circuit of warning or not, tested human body is by safety check apparatus, detection of end.
Described tested human body and the distance between microwave safety check apparatus within the scope of 0.1～1m time microwave safety check apparatus launched microwave detect.
3. beneficial effect
Adopt technical scheme provided by the invention, compare with existing known technology, there is following remarkable result:
(1) a kind of non-imaging type, non-contact microwave safety check apparatus based on microwave radar of the present invention, adopt a plurality of detecting units to be connected with the unit of warning respectively, and detecting unit comprises microwave radar, intermediate-frequency circuit, signal acquisition circuit and the signal processing circuit connecting in turn, the unit of warning comprises the circuit of warning, this device is by the thresholding contrast of the echoed signal collecting and database, and make the judgement of warning or not warning, and the technical difficulty that equipment is realized is low, and cost is few;
(2) a kind of non-imaging type, non-contact microwave safety check apparatus based on microwave radar of the present invention, microwave radar in its each detecting unit is linear array and arranges, the microwave signal of transmitting forms one dimension wave beam to tested person's body and covers, each position that can complete detection human body, accuracy is high, and effect is remarkable;
(3) a kind of non-imaging type, non-contact microwave safety check apparatus based on microwave radar of the present invention, its manufacture difficulty and complicacy are well below imaging type microwave rays safety detection apparatus, and each device all can be realized at home, is more conducive to promote the use of on a large scale;
(4) a kind of non-imaging type, non-contact microwave safety inspection method based on microwave radar of the present invention, collection signal is accurate, and method of operating is simple, and dirigibility is high, and cost is lower.
Accompanying drawing explanation
Fig. 1 is a kind of non-imaging type based on microwave radar of the present invention, the structural representation of non-contact microwave safety check apparatus;
Fig. 2 is the structured flowchart of microwave radar in the present invention;
Fig. 3 is a kind of non-imaging type based on microwave radar of the present invention, the process flow diagram of non-contact microwave safety inspection method.
Label declaration in schematic diagram:
1, microwave radar; 11, microwave source; 12, modulator; 13, voltage controlled oscillator; 14, power amplifier; 15, emitting antenna; 16, receiving antenna; 17, low noise amplifier; 18, frequency mixer; 2, intermediate-frequency circuit; 3, signal acquisition circuit; 4, signal processing circuit; 5, the circuit of warning.
Embodiment
For further understanding content of the present invention, the invention will be further described by reference to the accompanying drawings.
Embodiment
In conjunction with Fig. 1, Fig. 2 and Fig. 3, a kind of non-imaging type, non-contact microwave safety check apparatus based on microwave radar of the present embodiment, comprise a plurality of identical detecting units and the unit of warning, a plurality of identical detecting units are connected with the unit of warning respectively, detecting unit comprises microwave radar 1, intermediate-frequency circuit 2, signal acquisition circuit 3 and the signal processing circuit 4 connecting in turn, and the unit of warning comprises the circuit 5 of warning.
The microwave radar 1 of the present embodiment is for launched microwave and receive the signal that tested target is reflected back, microwave radar 1 in each detecting unit is linear array and arranges, and between each microwave radar 1, have certain spacing, the microwave signal of conveniently launching forms the tested human body of multi-beam antenna.The transmitting branch of microwave radar 1 comprises the microwave source 11 that works in microwave frequency band, modulator 12, voltage controlled oscillator 13, power amplifier 14 and emitting antenna 15, receiving branch comprises the receiving antenna 16 that works in microwave frequency band, low noise amplifier 17 and frequency mixer 18, microwave source 11 is connected with modulator 12, modulator 12 respectively with voltage controlled oscillator 13, frequency mixer 18 connects, voltage controlled oscillator 13, power amplifier 14 is connected successively with emitting antenna 15, and receiving antenna 16 and low noise amplifier 17, frequency mixer 18 connects successively, the microwave of microwave source 11 transmittings produces modulation signal through modulator 12, the voltage controlled oscillator 13 that is loaded into low-power consumption produces microwave continuous ripple signal, through power division, become two-way, one tunnel enters frequency mixer 18 as local oscillation signal, amplify by emitting antenna 15 to tested human-body emitting through power amplifier 14 on another road, the microwave signal of transmitting penetrates human body clothing, run into after body surface or concealment contraband goods, reflect, after receiving antenna 16 receives, input low noise amplifier 17 amplifies, then enter frequency mixer 18 and carry out mixing with local oscillation signal, output packet is containing the continuous wave signal of tested human body information.
Emitting antenna 15 to the microwave signal of tested human-body emitting is:
In formula,
U
t: be the voltage of launched microwave carrier signal;
U
tm: be the range value of launched microwave carrier signal voltage;
ω
0: be the angular frequency of launched microwave carrier signal;
Δ ω: for the angular frequency of launched microwave carrier signal inclined to one side;
Ω
m: be the modulation angular frequency of launched microwave carrier signal.
The microwave signal that this emitting antenna 15 is launched, runs into after tested human body, is reflected back the receiving antenna 16 of microwave radar 1, and its microwave signal being reflected back is:
In formula,
U
r: for receiving the voltage of microwave carrier signals;
U
rm: for receiving the range value of microwave carrier signals voltage;
τ: for microwave signal propagates into the round time delay of target from radar.
The information such as the amplitude of echoed signal, phase place, frequency are determined by the attributive character of tested target, then enter successively intermediate-frequency circuit 2, signal acquisition circuit 3 and signal processing circuit 4, through the contrast of echo signal data storehouse and thresholding, carry out contraband goods and non-contraband and the not detection judgement of belongings.
The intermediate-frequency circuit 2 of the present embodiment comprises wave filter, intermediate frequency amplifier, wave detector and the low-frequency amplifier connecting in turn, for the signal of microwave radar 1 output is carried out to filtering, intermediate frequency amplification, detection and low frequency, amplifies.The signal acquisition circuit 3 of the present embodiment comprises analog signal input circuit, pre-process circuit, analog to digital conversion circuit and the digital signal input circuit connecting in turn, for the low frequency signal of intermediate-frequency circuit 2 outputs being carried out to collection of simulant signal, pre-service, analog-digital conversion and digital signal input.The signal processing circuit 4 of the present embodiment adopts digital signal processing circuit, for the digital signal of signal acquisition circuit 3 inputs is carried out to feature extraction, comparison and identification.The circuit 5 of warning of the present embodiment is comprised of sound, light, vibration transducer or other forms of sensor, and when signal processing circuit 4 is made the judgement that tested human body carries concealment contraband goods, the circuit 5 of warning provides sound, light, vibration or other forms of warning; When signal processing circuit 4 is made the judgement that tested human body do not carry concealment contraband goods, the circuit 5 of warning or not.
When the present embodiment carries out safety check, adopt with the following method, a kind of non-imaging type, non-contact microwave safety inspection method based on microwave radar, comprises the steps:
1) open microwave safety check apparatus, human body enters Mag & Bag Area and safety check apparatus in a distance, keeps relatively static or relative motion;
2) be a plurality ofly microwave radar 1 launched microwave that linear array arranges and tested person's body is formed to one dimension wave beam cover, and advancing or the another motion in one dimension of a plurality of microwave radar 1 by human body self, realization is surveyed the whole body of two-dimension human body or partial sweep, detection completes the continuous wave signal that back reflection returns and enters successively intermediate-frequency circuit 2, signal acquisition circuit 3 and signal processing circuit 4, through signal processing circuit 4, carry out feature extraction, with echo signal data storehouse and thresholding contrast, judge whether echoed signal exceeds thresholding, if exceed thresholding, judge human body concealment any contraband, if lower than thresholding, judge that human body do not hide contraband goods,
3) if human body concealment metal or nonmetal contraband goods, the circuit 5 of warning mode visible by sound, light, vibration etc., that can examine is warned, security staff puts in isolation and under investigation tested human body, if human body is not hidden metal or nonmetal contraband goods, the circuit 5 of warning or not, tested human body is by safety check apparatus, detection of end.
Distance in the present embodiment between tested human body and microwave safety check apparatus within the scope of 0.1～1m time microwave safety check apparatus to tested target launched microwave, and the scattering microwave of receiving target, for carrying out human body clothing, hide the target identification and detection of various contraband goodss, not only can find the metal contraband goods of hiding under human body clothing, can also find that the nonmetal contraband goods of hiding under human body clothing is as sintex, plastics pistol, slurry explosives etc., adopt hand-held or safety check gate-type all can realize, easy to use, can become the existing good complement of utilizing the hand-held metal safety check instrument of electromagnetic induction principle.
The microwave radar 1 of the present embodiment works in continuous wave system, can adopt the frequency modulated continuous wave radar system of frequency sweep form, or point is Doppler's continuous wave radar system of form frequently, and when the frequency modulated continuous wave radar that employing works in frequency sweep form is surveyed human body concealment contraband goods, static or move and all can between microwave safety check apparatus and tested human body; And while adopting the doppler radar human body concealment contraband goods of the form frequently of working in, between microwave safety check apparatus and tested human body, need relative motion in opposite directions, be microwave safety check apparatus when static, tested human body need be advanced to microwave safety check apparatus direction, forms relative motion; When tested human body is static, microwave safety check apparatus need carry out the relative motion of scan-type to tested human body.
A kind of non-imaging type, non-contact microwave safety check apparatus based on microwave radar of the present embodiment, adopt powered battery or Alternating Current Power Supply, can carry out whole body or local scanning detection to tested human body, use flexibly, simple to operate, technical difficulty is lower, and cost is few, all devices are domestic all can independently be realized, and is conducive to large-scale promotion and uses.
Below schematically the present invention and embodiment thereof are described, this description does not have restricted, and shown in accompanying drawing is also one of embodiments of the present invention, and actual structure is not limited to this.So, if those of ordinary skill in the art is enlightened by it, in the situation that not departing from the invention aim, without the creationary frame mode similar to this technical scheme and the embodiment of designing, all should belong to protection scope of the present invention.
Claims (9)
1. the non-imaging type based on microwave radar, non-contact microwave safety check apparatus, it is characterized in that: comprise a plurality of detecting units and the unit of warning, described a plurality of detecting units are connected with the unit of warning respectively, described detecting unit comprises the microwave radar (1) connecting in turn, intermediate-frequency circuit (2), signal acquisition circuit (3) and signal processing circuit (4), the described unit of warning comprises the circuit of warning (5), described microwave radar (1) is for launched microwave and receive the signal that tested target is reflected back, described intermediate-frequency circuit (2) is for carrying out filtering to the signal of microwave radar (1) output, intermediate frequency amplifies, detection and low frequency amplify, described signal acquisition circuit (3) is for carrying out collection of simulant signal to the low frequency signal of intermediate-frequency circuit (2) output, pre-service, analog-digital conversion and digital signal input, described signal processing circuit (4) is for carrying out feature extraction to the digital signal of signal acquisition circuit (3) input, relatively with identification, and make and warning and non-judgement of warning according to radar echo signal database and thresholding, the described circuit of warning (5) provides and warns for the judgement of warning that signal processing circuit (4) is made.
2. non-imaging type, the non-contact microwave safety check apparatus based on microwave radar according to claim 1, is characterized in that: the microwave radar (1) in each described detecting unit is linear array and arranges.
3. the non-imaging type based on microwave radar according to claim 2, non-contact microwave safety check apparatus, it is characterized in that: the transmitting branch of described microwave radar (1) comprises microwave source (11), modulator (12), voltage controlled oscillator (13), power amplifier (14) and emitting antenna (15), receiving branch comprises receiving antenna (16), low noise amplifier (17) and frequency mixer (18), described microwave source (11) is connected with modulator (12), described modulator (12) respectively with voltage controlled oscillator (13), frequency mixer (18) connects, described voltage controlled oscillator (13), power amplifier (14) is connected successively with emitting antenna (15), described receiving antenna (16), low noise amplifier (17) is connected successively with frequency mixer (18), the microwave of microwave source (11) transmitting produces modulation signal through modulator (12), the voltage controlled oscillator (13) that is loaded into low-power consumption produces microwave continuous ripple signal, through power division, become two-way, one tunnel enters frequency mixer (18) as local oscillation signal, amplify by emitting antenna (15) to tested human-body emitting through power amplifier (14) on another road, the microwave signal of transmitting penetrates human body clothing, run into after body surface or concealment contraband goods, reflect, after receiving antenna (16) receives, input low noise amplifier (17) amplifies, then enter frequency mixer (18) and carry out mixing with local oscillation signal, output packet is containing the continuous wave signal of tested human body information.
4. non-imaging type, the non-contact microwave safety check apparatus based on microwave radar according to claim 3, is characterized in that: described intermediate-frequency circuit (2) comprises wave filter, intermediate frequency amplifier, wave detector and the low-frequency amplifier connecting in turn.
5. non-imaging type, the non-contact microwave safety check apparatus based on microwave radar according to claim 4, is characterized in that: described signal acquisition circuit (3) comprises analog signal input circuit, pre-process circuit, analog to digital conversion circuit and the digital signal input circuit connecting in turn.
6. non-imaging type, the non-contact microwave safety check apparatus based on microwave radar according to claim 5, is characterized in that: described signal processing circuit (4) adopts digital signal processing circuit.
7. non-imaging type, the non-contact microwave safety check apparatus based on microwave radar according to claim 6, is characterized in that: the described circuit of warning (5) is comprised of sound, light or vibration transducer.
8. the non-imaging type based on microwave radar, a non-contact microwave safety inspection method, is characterized in that, comprises the steps:
1) open microwave safety check apparatus, human body enters Mag & Bag Area and safety check apparatus in a distance, keeps relatively static or relative motion;
2) be a plurality ofly microwave radar (1) launched microwave that linear array arranges and tested person's body is formed to one dimension wave beam cover, and advancing or the another motion in one dimension of a plurality of microwave radar (1) by human body self, realization is surveyed the whole body of two-dimension human body or partial sweep, detection completes the continuous wave signal that back reflection returns and enters successively intermediate-frequency circuit (2), signal acquisition circuit (3) and signal processing circuit (4), through signal processing circuit (4), identifies and judges whether human body hides contraband goods;
3) if human body concealment metal or nonmetal contraband goods, the mode visible, that can examine such as circuit (5) employing sound, light, vibration of warning is warned, security staff puts in isolation and under investigation tested human body, if human body is not hidden metal or nonmetal contraband goods, the circuit (5) of warning or not, tested human body is by safety check apparatus, detection of end.
9. non-imaging type, the non-contact microwave safety inspection method based on microwave radar according to claim 8, is characterized in that: described tested human body and the distance between microwave safety check apparatus within the scope of 0.1～1m time microwave safety check apparatus launched microwave detect.
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