CN204731427U - Array Nonlinear Parameter sniffer - Google Patents
Array Nonlinear Parameter sniffer Download PDFInfo
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- CN204731427U CN204731427U CN201520344505.XU CN201520344505U CN204731427U CN 204731427 U CN204731427 U CN 204731427U CN 201520344505 U CN201520344505 U CN 201520344505U CN 204731427 U CN204731427 U CN 204731427U
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Abstract
A kind of array Nonlinear Parameter sniffer, comprise: be arranged at the transmitter at inspection instrument top, be arranged at inspection instrument periphery for the receiver that receives self-excitation echo and the signal processor be connected with receiver with transmitter respectively, wherein: transmission antenna group comprises at least two emitting antennas to launch the electromagnetic wave signal of two kinds of different frequencies simultaneously, receiving antenna array comprises at least five sub antennas, to receive the echoed signal of different frequency range respectively simultaneously.The utility model can make full use of the Time and place information of electronic target scattering harmonic wave, realizes the efficient detection of Weak Signal target under noise circumstance.
Description
Technical field
The utility model relates to a kind of technology of metal detection field, specifically a kind of array Nonlinear Parameter sniffer.
Background technology
Artificial metal structural objects (mainly comprising artificial metal and semiconductor) is different from the object of occurring in nature, and its volt-ampere characteristic has distinctive nonlinear characteristic, is called as Nonlinear Parameter in field of detecting.Nonlinear Parameter radiation can produce harmonic wave again after microwave irradiation, and wherein, the third-harmonic component energy of artificial metal's target is maximum, and the second harmonic component energy of semiconductor targets is maximum.Receiving utilizes the scattering harmonic wave of object to be called as Nonlinear Parameter detector (or harmonic radar) to the device detecting specific objective, is widely used in the key areas such as investigation, counterreconnaissance and security at present.In practical application, the electromagnetic conversion efficiency of many Nonlinear Parameters is low, and scattering harmonic wave is very faint, and under ambient noise interference, be easy to cause the false dismissed rate of detector or the high problem of false alarm rate, in the postal route inspection application of security department, problem is particularly outstanding.
Through finding the retrieval of prior art, Chinese patent literature CN102540262, open (bulletin) day 2012.07.04, discloses a kind of nonlinear node detector, for detecting electronic target; Chinese patent literature CN201011524, open (bulletin) day 2008.01.23, discloses the non-linear knot detection radar of a kind of antenna and receiving and transmitting front end integrated design, comprises exploring antenna and detection radar main frame; Chinese patent literature CN103176181, open (bulletin) day 2013.06.26, discloses a kind of nonlinear node detector of Continuous Wave with frequency modulation system, comprising: modulation signal generator, produces modulation signal; Voltage controlled oscillator, modulated signal controls to produce continuous wave frequency signal; But above-mentioned technology all rests on to be excavated on the time domain of harmonic signal or the basis of frequency domain information.The radiate harmonic again of Nonlinear Parameter is scattering states, not boundling state, and the spatial information (si) of visible harmonic signal is even more important.Current Nonlinear Parameter detection method does not all consider that the reception of harmonic signal spatial information (si) utilizes, and is therefore difficult to deal with problems.
Utility model content
The utility model, for prior art above shortcomings, proposes a kind of array Nonlinear Parameter sniffer, can make full use of the Time and place information of electronic target scattering harmonic wave, realizes the efficient detection of Weak Signal target under noise circumstance.
The utility model is achieved through the following technical solutions:
The utility model relates to a kind of array Nonlinear Parameter sniffer, comprise: be arranged at the transmitter at inspection instrument top, be arranged at inspection instrument periphery for the receiver that receives self-excitation echo and the signal processor be connected with receiver with transmitter respectively, wherein:
Described transmitter comprises: transmission antenna group and the radiating circuit be attached thereto, wherein: radiating circuit is connected with transmission antenna group and signal processor respectively, transmission antenna group is to electromagnetic signals in container.
Described transmission antenna group comprises at least two emitting antennas to launch the electromagnetic wave signal of two kinds of different frequencies simultaneously.
Described receiver comprises: receiving antenna array and the receiving circuit be attached thereto, wherein: the self-excitation echo of metallic reflection in receiving antenna array receiving vessel, receiving circuit is connected with receiving antenna array and signal processor respectively.
Described receiving antenna array comprises at least five sub antennas, to receive the echoed signal of different frequency range respectively simultaneously; Be preferably and receive second harmonic and third harmonic simultaneously.
Described signal processor comprises: signal processing circuit, external control circuit and display circuit, wherein: signal processing circuit is connected with display circuit with external control circuit (as by key control etc.), radiating circuit, receiving circuit respectively, export steering order and receive user operation instruction, receiving video signals export display circuit to after being converted to semi-invariant feature space.
Described display circuit can the current and historical reception signal message of synthesis display.
Technique effect
Compared with prior art, the utility model array Nonlinear Parameter detector adopts array antenna to carry out hyperchannel reception to electronic target radiation signal, build the semi-invariant feature space of Received signal strength, judge decision-making according to the structural information of multi channel signals in feature space, effectively can detect the electronic target of only radiation Weak Signal in a noisy environment.
The utility model can be used for detecting the electronic installation such as mobile phone, digital camera, remote controlled bomb, wiretap, electronic storage medium be hidden in the article such as luggage, parcel, mail, especially the electronic target (being such as hidden in the CF card in parcel in can) that in complex environment, radiation signal is faint, can be widely used in all kinds of key place safety detection field.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation;
Fig. 2 is the utility model transmitting path structural representation;
Fig. 3 is the utility model receiving path structural representation;
Fig. 4 is the utility model antenna array distribution plan;
Fig. 5 is respectively to the accumulated time measure feature spatial contrast design sketch that the can of mailbag hollow metal box and in-built CF card detects in embodiment;
In figure: a is empty can, b is the can that CF card is housed.
Embodiment
Below embodiment of the present utility model is elaborated; the present embodiment is implemented under premised on technical solutions of the utility model; give detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, the transmission frequency of the present embodiment array Nonlinear Parameter detector can be 800MHz and 900MHz double frequency, can be used for detecting electronic target, comprising:
Key control unit, is connected with signal processing circuit, sends the instruction controlling emissive power for user;
Signal processing circuit, is connected with display circuit with key control unit, radiating circuit, receiving circuit, for receiving user's steering order of key control unit, controlling radiating circuit and generating desired signal; Meanwhile, receive the array signal that receiving circuit transmits, figure signal passes to display circuit after semi-invariant feature space;
Display circuit, is connected with signal processing circuit, the semi-invariant feature space structural information of and historical reception signal current for synthesis display;
Radiating circuit, is connected with transmission antenna group with signal processing circuit, for the control of receive signal processing circuit, produces transmitting needed for instructions; Transmission antenna group, is connected with radiating circuit, comprises two antennas, for being launched by the electromagnetic wave signal of two kinds of different frequencies simultaneously;
Receiving circuit, is connected with receiving antenna array with signal processing circuit, for receiving the echo signal that receiving antenna array transmits, and passes to signal processing circuit after the process such as filtering, mixing, AD sampling;
Receiving antenna array, is connected with receiving circuit, comprises five sub antennas, for synchronously receiving the echoed signal of electronic target radiation in all directions.
Described figure signal is discrete Fourier transformation in short-term in the present embodiment to semi-invariant feature space.
As shown in Figure 2, described transmission antenna group is two emitting antenna T1 and T2, is connected respectively with corresponding wave filter, for launching the electromagnetic wave signal of 800MHz and 900MHz.
Corresponding above-mentioned transmission antenna group, described radiating circuit comprises:
For generation of parametric excitation signal reference source,
Two phaselocked loops be connected with corresponding electrically controlled attenuator with reference source respectively, for two of Frequency Locking 800MHz and 900MHz launch pumping signals,
Two electrically controlled attenuators be connected with power amplifier with corresponding phaselocked loop respectively, for controlling the amplitude of pumping signal under the control of signal processing circuit, guarantee that the pumping signal amplitude being input to power amplifier is in power amplifier claimed range, simultaneously receiver can not be in saturated,
Two power amplifiers be connected with wave filter with corresponding electrically controlled attenuator respectively, for gating pulse power amplifier under the transmitting modulation signal of signal processing circuit, realize the pulsed modulation to transmitting, launching modulation signal pulsewidth is 200ps, cycle is 20ms, dutycycle is 1%,
Two wave filters be connected with emitting antenna with corresponding power amplifier respectively, for the interference filtering in the highpowerpulse signal that exported by power amplifier.
As shown in Figure 3, described receiving antenna array comprises: five receiving antennas R1, R2, R3, R4 and R5, for receiving 1699.16MHz second harmonic and the 2499.52MHz third harmonic of electronic target radiation.
Corresponding above-mentioned receiving antenna array, described receiving circuit comprises:
Five wave filters be connected with frequency mixer with corresponding receiving antenna respectively, for the interference in filtering Received signal strength,
Five frequency mixer be connected with amplification detector with corresponding wave filter respectively, for by export after Received signal strength and the mixing of local oscillator lockin signal 10.7MHz intermediate-freuqncy signal,
Five amplification detectors be connected with signal sampling combiner with corresponding frequency mixer respectively, for 10.7MHz intermediate-freuqncy signal is carried out narrow-band filtering, amplification and detection process,
The signal sampling combiner be connected with five amplification detectors, for carrying out AD sampling and merging to Five-channel signal, exports to signal processing circuit.
As shown in Figure 4, described transmission antenna group comprises: the first emitting antenna T1, is positioned at square detection case top, for launching 800MHz electromagnetic wave; Second emitting antenna T2, is positioned at square detection case top, for launching 900MHz electromagnetic wave;
Described receiving antenna array comprises:
First receiving antenna R1, is positioned at square detection case left surface, for receiving the 1699.16MHz second harmonic of electronic target radiation;
Second receiving antenna R2, is positioned at square detection case left surface, for receiving the 2499.52MHz third harmonic of electronic target radiation;
3rd receiving antenna R3, is positioned at square detection case top, for receiving the 1699.16MHz second harmonic of electronic target radiation;
4th receiving antenna R4, is positioned at square detection case right flank, for receiving the 1699.16MHz second harmonic of electronic target radiation;
5th receiving antenna R5, is positioned at square detection case right flank, for receiving the 2499.52MHz third harmonic of electronic target radiation.
The present embodiment relates to the metal probing method of said system, comprises the following steps:
Step 1, object will be detected put into exploration vessel;
Step 2, the electromagnetic wave irradiation simultaneously launching 800MHz and 900MHz by two emitting antenna T1 and T2 are detected object, synchronous, received by five receiving antennas R1, R2, R3, R4 and R5 simultaneously and be detected electronic target in object and be scattered in 1699.16MHz second harmonic in all directions of space and 2499.52MHz harmonic signal;
Step 3, built frequency domain (a kind of accumulated time amount) feature space of receiving array signal by signal processing circuit, and in display circuit real-time exhibition;
Step 4, adjust transmit signal power by external control circuit, and by display circuit Synchronous Received signal strength, obtain optimum efficiency;
Step 5, to be transferred history coherent signal (comprising time-domain signal and semi-invariant signal) by display circuit and contrast with current demand signal, and consider reference threshold, make a policy: when second harmonic time-domain signal or semi-invariant signal intensity exceed corresponding reference threshold, judge that container is at semiconductor targets, otherwise do not exist; When third harmonic time-domain signal or semi-invariant signal intensity exceed corresponding reference threshold, judge that container is at metal target, otherwise do not exist;
As shown in Figure 5, the reference threshold Xuan Ze in the present embodiment ?50dB.
Autostore signal data after step 6, artificial annotation results, for step 5 in subsequent detection process.
As shown in figure 5 a and 5b, the Five-channel signal of the corresponding receiving antenna R1 ~ R5 of CH1, CH2, CH3, CH4 and CH5 signal difference that the lines that difformity marks represent.
The accumulated time measure feature spatial structural form of the can of empty can and in-built CF card is mainly manifested in CH4 signal (i.e. the signal of receiving antenna R4 reception) upper difference, compared with empty can, the CH4 signal energy of the can of in-built CF card is obviously higher.
This illustrates, the array Nonlinear Parameter detector that the present embodiment provides accurately can extract the CF card echoed signal by can shielding in mailbag environment.
In the present embodiment, the semi-invariant feature space building method principle of signal processing circuit is: with data length 1024 be window size to sampling, merge after Five-channel digital signal carry out discrete Fourier transformation in short-term, in accumulated time measure feature space, show the space structure of Five-channel signal.
In the present embodiment, the excitation phase locked source of radiating circuit and the local oscillator phase locked source of receiving circuit are homologies, namely adopt the frequency signal that same crystal oscillator produces.
The array Nonlinear Parameter detector adopting the present embodiment to provide detects the electronic target that radiation signal in complex environment is faint, result shows, the array antenna received technology of the utility model design and feature space building method, fully utilized the sky of electronic target radiation signal. time information judge decision-making, the electronic target of only radiation Weak Signal can be gone out by accurate detection in a noisy environment.
Claims (9)
1. an array Nonlinear Parameter sniffer, it is characterized in that, comprising: be arranged at the transmitter at inspection instrument top, be arranged at inspection instrument periphery for the receiver that receives self-excitation echo and the signal processor be connected with receiver with transmitter respectively.
2. array Nonlinear Parameter sniffer according to claim 1, it is characterized in that, described signal processor comprises: signal processing circuit, external control circuit and display circuit, wherein: signal processing circuit is connected with display circuit with external control circuit, radiating circuit, receiving circuit respectively, export steering order and receive user operation instruction, receiving video signals export display circuit to after being converted to semi-invariant feature space.
3. array Nonlinear Parameter sniffer according to claim 1, it is characterized in that, described transmitter comprises: transmission antenna group and the radiating circuit be attached thereto, wherein: radiating circuit is connected with transmission antenna group and signal processor respectively, transmission antenna group is to electromagnetic signals in container.
4. array Nonlinear Parameter sniffer according to claim 3, is characterized in that, described transmission antenna group comprises at least two emitting antennas to launch the electromagnetic wave signal of two kinds of different frequencies simultaneously.
5. array Nonlinear Parameter sniffer according to claim 1, it is characterized in that, described receiver comprises: receiving antenna array and the receiving circuit be attached thereto, wherein: the self-excitation echo of metallic reflection in receiving antenna array receiving vessel, receiving circuit is connected with receiving antenna array and signal processor respectively.
6. array Nonlinear Parameter sniffer according to claim 4, it is characterized in that, described receiving antenna array comprises at least five sub antennas, to receive the echoed signal of different frequency range respectively simultaneously.
7. array Nonlinear Parameter sniffer according to claim 3, it is characterized in that, described radiating circuit comprises: reference source, two phaselocked loops be connected with corresponding electrically controlled attenuator with reference source respectively, two electrically controlled attenuators be connected with power amplifier with corresponding phaselocked loop respectively, two power amplifiers be connected with wave filter with corresponding electrically controlled attenuator respectively and two wave filters be connected with emitting antenna with corresponding power amplifier respectively.
8. array Nonlinear Parameter sniffer according to claim 5, it is characterized in that, described receiving antenna array comprises:
First receiving antenna, be positioned at the inspection instrument left surface of square,
Second receiving antenna, be positioned at the inspection instrument left surface of square,
3rd receiving antenna, be positioned at the inspection instrument top of square,
4th receiving antenna, be positioned at the inspection instrument right flank of square,
5th receiving antenna, is positioned at the inspection instrument right flank of square.
9. array Nonlinear Parameter sniffer according to claim 5, it is characterized in that, described receiving circuit comprises:
Five wave filters be connected with frequency mixer with corresponding receiving antenna respectively, five frequency mixer be connected with amplification detector with corresponding wave filter respectively, five amplification detectors be connected with signal sampling combiner with corresponding frequency mixer respectively, the signal sampling combiner that is connected with five amplification detectors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520344505.XU CN204731427U (en) | 2015-05-26 | 2015-05-26 | Array Nonlinear Parameter sniffer |
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| CN201520344505.XU CN204731427U (en) | 2015-05-26 | 2015-05-26 | Array Nonlinear Parameter sniffer |
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| CN204731427U true CN204731427U (en) | 2015-10-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109507642A (en) * | 2018-12-29 | 2019-03-22 | 广西科技大学 | A kind of Nonlinear Parameter harmonic detecting method based on noise FM technology |
| 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 |
-
2015
- 2015-05-26 CN CN201520344505.XU patent/CN204731427U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109507642A (en) * | 2018-12-29 | 2019-03-22 | 广西科技大学 | A kind of Nonlinear Parameter harmonic detecting method based on noise FM technology |
| 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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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151028 Termination date: 20160526 |