CN112946768A - Non-contact hidden object detection device and method with recognition capability - Google Patents
Non-contact hidden object detection device and method with recognition capability Download PDFInfo
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Abstract
The invention provides a non-contact hidden object detection device with identification capability and a method thereof. The device enables the detected object to be detected by arranging a signal module, an acquisition module, a processing module, a transmission module and a display terminal; the device adopts the cognitive microwave radar technology, transmits ultra-wideband pulse signals, receives echo signals scattered by a target, extracts typical parameters through characteristic analysis of the target echo signals, and compares the typical parameters with target echo characteristics in a known target library to realize detection and identification of the hidden target.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of detection devices, and particularly relates to a non-contact hidden object detection device with identification capability and a method thereof.
[ background of the invention ]
Non-contact concealed object detection is an important means required for safety precaution of places such as airports, courts, prisons, detention houses, important conferences, important parts and the like. The metal security inspection door utilizes the principle of electromagnetic induction and a coil through which alternating current passes to generate a rapidly changing magnetic field. This magnetic field can induce eddy currents inside the metal object. The eddy current will generate a magnetic field, which in turn affects the original magnetic field and causes the detector to sound. The performance of the equipment is greatly influenced by the external environment, the detection distance is less than 0.5m, and in order to avoid the influence of surrounding metal objects, the preset parameter values are needed according to the weight, the quantity or the shape of the metal objects to be detected. Because the equipment can only detect whether metal articles are carried or not, the article types cannot be distinguished, the false alarm rate and the missing report rate are high, and manual secondary inspection is needed; the handheld metal detector needs manual cooperation for inspection, is low in efficiency and is easy to infringe personal privacy. The millimeter wave security inspection equipment acquires three-dimensional images of detected personnel by using a millimeter wave three-dimensional imaging technology, and detects carried prohibited articles by using an image processing and target identification technology. The equipment can detect metal and non-metal articles, can distinguish the types of targets, and has high detection rate and low false alarm rate. But is limited by the working principle, the detection distance is less than 0.5m, the requirement on the posture of an inspector is higher, the occupied space is large, and the price is high.
[ summary of the invention ]
The present invention is directed to overcome the above-mentioned shortcomings in the prior art, and to provide a non-contact hidden object detecting device and method with identification capability, so as to solve the problem that a non-contact hidden object detecting device with portability and high cost performance is lacking in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a non-contact foggy detection device with identification capability comprising:
the signal module is used for generating and transmitting an ultra-wideband pulse signal to a target to be detected;
the acquisition module is used for receiving the analog signal returned by the detected target, amplifying the returned analog signal and converting the amplified analog signal into a digital signal;
the processing module is used for processing the digital signal, analyzing and obtaining the characteristic parameter of the resonance signal of the detected target, and comparing the resonance characteristic parameter with the parameter of the existing target object to obtain a detection result;
and the transmission module is used for transmitting the identified detection result to the display terminal.
The invention is further improved in that:
preferably, the frequency range of the ultra-wideband pulse signal is 50MHz-5 GHz.
Preferably, the signal module is connected with a transmitting antenna, and the acquisition module is connected with a receiving antenna.
Preferably, the transmitting antenna is a dipole antenna or a vivaldi antenna, and the receiving antenna is a dipole antenna or a vivaldi antenna.
Preferably, the acquisition module comprises a receiving amplifying circuit and a sampling circuit, and the sampling circuit adopts time-delay equivalent sampling.
Preferably, the processing module performs digital correlation processing on the sampled echo signal to obtain a resonant signal of the detected target; and performing cosine transform or wavelet transform on the resonance signal to obtain the characteristic parameters of the resonance signal.
Preferably, the transmission module is a wireless or wired data transmission circuit.
Preferably, the transmission module is connected with a display terminal.
A non-contact concealed object detection method with identification capability comprises the following steps:
step 1, generating and transmitting an ultra-wideband pulse signal to a target to be detected;
and 4, transmitting the identified detection result to a display terminal.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a portable non-contact concealed object detection device with identification capability. The device can detect the detected object by arranging an antenna, a signal source, an acquisition module, a processing module, a transmission module and a display terminal; the device adopts the cognitive microwave radar technology, transmits ultra-wideband pulse signals, receives echo signals scattered by a target, extracts typical parameters through characteristic analysis of the target echo signals, and compares the typical parameters with target echo characteristics in a known target library to realize detection and identification of the hidden target. The device is a high-cost-performance and non-invasive whole-body scanning detection device, has the capability of learning and adapting to a new target, and can update the target library in real time. The device has small volume, light weight and convenient and fast installation, can be used for the key points of places and facilities such as airports, courts, prisons, detention houses, important meetings, important parts and the like with the carrying limitation of specific articles, and can also be combined with the existing security inspection channel to be installed in a concealed way. The device can detect various types of pipe cutters, firearms, grenades, oil tanks and the like; the detection rate is more than 90%, and the requirement on personnel is greatly reduced due to the provided high performance; the detection distance can reach 2m, the standing detection capability is provided, and the emergency response time is prolonged. The device can be operated on a PC and a mobile terminal, and can also be used as local special alarm equipment. The device can be designed to be portable, has small integral volume, is convenient for hidden installation, and can be used for networking a plurality of devices; the device does not generate images, and absolute privacy protection is realized; the frequency conforms to the international regulations for safely using the microwave bandwidth; the device can automatically return a detection result in real time without manual operation; the compared target library can be updated in time. The device can display the condition that people pass through the detection area in real time at key points. According to the requirement or the requirement of installation space, the equipment can be installed in a hidden or open mode, and can also be installed towards different detection directions.
The invention also discloses a non-contact detection method for the hidden objects with the identification capability, which transmits the ultra-wideband pulse signal to a target to be detected, receives a returned analog signal, amplifies the returned signal and converts the amplified analog signal into a digital signal; and comparing the received digital signal characteristic parameters with the characteristic parameters in the target library to obtain a detection result, and displaying the detection result on the terminal equipment. The method has high detection accuracy and high efficiency, and can be applied in real time.
[ description of the drawings ]
FIG. 1 is a logic diagram of a non-contact covert detection device method of the present invention;
FIG. 2 is a schematic diagram of a target echo signal according to the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
FIG. 4 is a graph of test results for an embodiment of the present invention.
[ detailed description ] embodiments
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In nature, any conductor has a natural resonant frequency that is related only to the dimensions and material characteristics of the conductor. Typically as follows:
TABLE 1 natural frequency table of articles
| Serial number | Article with a cover | Size of | First order natural frequency (GHz) |
| 1 | Machine gun | 30-40cm | 1.4 |
| 2 | Pistol | 15-20cm | 0.6 |
| 3 | Metal knife | 8-20cm | 0.6 |
The invention aims to provide a portable non-contact type concealed object detection method and device with identification capability. The method and the device adopt a cognitive microwave radar technology, irradiate a target to be detected by emitting an ultra-wideband pulse signal with a frequency spectrum covering 50MHz-5GHz, perform characteristic analysis on an echo signal scattered by the target, extract characteristic parameters such as inherent resonant frequency of the target and the like, and compare the characteristic parameters with the target echo characteristics in a known target library to realize the detection and identification of the hidden target. The working principle of the device is that the cognitive microwave radar technology is utilized to emit ultra-wideband signals, the echo of the detected article is obtained, and the article is detected and identified by extracting the inherent resonant frequency of the article.
The device comprises an antenna, a signal generating module, an acquisition module, a processing module, a transmission module and a display terminal.
Referring to fig. 1, the signal module of the present invention is connected to a transmitting antenna, the collecting module is connected to a receiving antenna, the collecting module is connected to a processing module, the processing module is connected to a transmitting module, and the transmitting module is connected to a display terminal.
1) Antenna with a shield
The antenna adopts a dual-antenna configuration mode of separately receiving and transmitting, and specifically comprises a transmitting antenna and a receiving antenna, wherein the two antennas can be ultra-wideband antennas such as dipole antennas and vivaldi antennas, and the working frequency covers 50MHz-5 GHz.
As one preferable mode, the antenna is a dipole antenna.
2) Signal source
The signal source is used as a frequency source and consists of an ultra-wideband signal generating module and a power amplification module, and the generating module is connected with the power amplification module to complete the generation and emission of ultra-wideband pulse signals with frequency spectrum covering 50MHz-5 GHz; the power amplifier module is used for transmitting the signal through the transmitting antenna; the signal source is connected with the transmitting antenna.
Preferably, the ultra-wideband pulse signal is generated by an avalanche triode, such as a Gaussian pulse, and the frequency spectrum covers 50MHz-5 GHz; the signal scattered back by the illuminated target is shown in fig. 2, where the solid line portion is the signal scattered back by the emitted pulse illuminating the target and the dashed line portion is the resonant signal intrinsic to the target.
The transmitted signal is exemplified by a gaussian pulse, which can be expressed as:
in the formula (1), σ is a standard deviation and reflects the steepness of the gaussian pulse.
The received signal is then:
y(t)＝yE(t)+yL(t)+n(t) (2)
the first term y in the formula (2)E(t) is the pulse signal scattered back by the target (solid line part), the second term yL(t) is a resonance signal (dotted line portion) inherent to the target, and the third term n (t) is reception noise.
In the formula (3), t0And A is the scattering echo time delay of the target, and A is the scattering echo amplitude of the target.
In the formula (4), m is the number of target resonance points; a ism，
Reflecting the amplitude and phase of the resonance point, and relating to the scattering characteristic, the irradiation angle and the like of the target; let sm＝σm+jωmFor the resonance parameters (related to the target size, intrinsic characteristics of the target), the resonance signal characteristics are reflected, where σm＝1/τmAs attenuation factor, ωm＝2πfmIs a frequency factor (f)mIs the resonant frequency, taumAs decay time).
3) Acquisition module
The acquisition module consists of a receiving amplification circuit and a sampling circuit, the receiving amplification circuit is connected with the sampling circuit to complete the receiving, amplification and analog-to-digital conversion of the scattering signal of the detected target, and the digital signal is output to the back-end processing module. The acquisition module is connected with the receiving antenna. The scattering signal is a signal of the ultra-wideband pulse signal scattered back by the target.
Preferably, the sampling circuit completes the acquisition of the ultra-wideband pulse signal by adopting a time-delay equivalent sampling principle to obtain y (t).
4) Processing module
The processing module is composed of processors such as ARM, CPU, GPU or DSP and the like, and completes the inherent resonance signal y in the echo y (t) of the detected targetLAnd (t) detecting the characteristics, and identifying the articles by methods such as pattern recognition, machine learning and deep learning.
Preferably, the processing circuitry employs a TX2 series GPU processor from Integrada. First, a target resonance signal y is detected from the formula (2) by a digital correlation process or the likeL(t); then the extracted resonance signal y is subjected toL(t) processing (cosine transform, wavelet transform, singular point expansion method, machine learning, deep learning and other methods can be adopted), analyzing and obtaining the characteristic parameters of the resonance signals, wherein the characteristic parameters are the resonance frequency fmAnd decay time taum(ii) a The obtained characteristic parameters are then compared with the characteristic parameters stored in the target databaseComparing known target characteristic parameters, identifying a target to be detected, and giving the type and the credibility of the target to be detected, wherein the credibility is the similarity degree of the detected object and the objects in the target library; and finally, sending the detection result to a transmission module. The processing module is provided with a target database, and the target database can be updated and adjusted, so that the whole device can be suitable for various scenes. If the detected object is not in the original target library, the detection shows that no target exists. If the target feature needs to be detected later, the target feature needs to be added into the target library.
5) Transmission module
The transmission module is composed of a wireless/wired transmission circuit, and transmits the detected target detection result to a designated display terminal, wherein the wired mode is USB, and the wireless mode is Bluetooth or WIFI, so that the connection with the display terminal is realized.
6) Display terminal
The display terminal displays the detection result of the detected object, can adopt a fixed station display to display, and can also display in a mobile terminal through a network. Preferably, the display terminal is a mobile phone or a fixed display, so that the feedback and statistics of the detection results of the detected personnel in the detection area are realized.
According to the installation space, all components in the device can be arranged in a box or distributed at different positions; and can also be used with video monitoring equipment.
As one of preferable schemes, all the devices of the present invention are made as a portable device, and the device includes a case, a host is provided inside the case, and a display terminal, a transmitting antenna and a receiving antenna are provided outside the case. The host comprises a signal source, an acquisition module, a processing module and a transmission module.
The invention also discloses a non-contact hidden object detection method with identification capability, which comprises the following steps:
s1, the signal source transmits an ultra-wideband pulse signal towards the detected target through the transmitting antenna;
s2, the receiving module receives and amplifies the target scattering signal; the acquisition module performs analog-to-digital conversion on the amplified signal and transmits the converted digital signal to the processing module;
s3, the processing module carries out relevant processing on the digital signal, detects the inherent resonance signal of the target, then carries out cosine transform or wavelet transform on the extracted resonance signal, analyzes and obtains the characteristic parameters (resonance frequency, attenuation time and the like) of the resonance signal; then, the target to be detected is identified by comparing the target to known targets stored in a target library, and a detection result is sent to a transmission module;
and S4, the transmission module transmits the detection result to the display terminal, and the display terminal displays the detection result (the type and the reliability of the carried article).
Examples
Referring to fig. 3, the device host is placed at the door of the conference room, the antenna faces the entrance of the conference room, and the display terminal displays the result as shown in fig. 4 by detecting.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A non-contact concealer detection device having identification capabilities, comprising:
the signal module is used for generating and transmitting an ultra-wideband pulse signal to a target to be detected;
the acquisition module is used for receiving the analog signal returned by the detected target, amplifying the returned analog signal and converting the amplified analog signal into a digital signal;
the processing module is used for processing the digital signal, analyzing and obtaining the characteristic parameter of the resonance signal of the detected target, and comparing the resonance characteristic parameter with the parameter of the existing target object to obtain a detection result;
and the transmission module is used for transmitting the identified detection result to the display terminal.
2. The non-contact concealer device as claimed in claim 1, wherein the ultra-wideband pulse signal has a frequency in the range of 50MHz to 5 GHz.
3. The device as claimed in claim 1, wherein the signal module is connected to a transmitting antenna and the collection module is connected to a receiving antenna.
4. A non-contact detection device for concealable objects with identification capability according to claim 3, characterized in that said transmitting antenna is a dipole antenna or vivaldi antenna and said receiving antenna is a dipole antenna or vivaldi antenna.
5. The device as claimed in claim 1, wherein the collecting module comprises a receiving and amplifying circuit and a sampling circuit, and the sampling circuit adopts time-delay equivalent sampling.
6. The apparatus as claimed in claim 1, wherein the processing module performs digital correlation on the sampled echo signals to obtain resonance signals of the detected object; and performing cosine transform or wavelet transform on the resonance signal to obtain the characteristic parameters of the resonance signal.
7. The device as claimed in claim 1, wherein the transmission module is a wireless or wired data transmission circuit.
8. The device as claimed in claim 1, wherein a display terminal is connected to the transmission module.
9. A non-contact concealed object detection method with identification capability is characterized by comprising the following steps:
step 1, generating and transmitting an ultra-wideband pulse signal to a target to be detected;
step 2, receiving the analog signal returned by the detected target, amplifying the returned analog signal, and converting the amplified analog signal into a digital signal;
step 3, processing the digital signal, analyzing and obtaining the characteristic parameter of the resonance signal of the detected target, and comparing the resonance characteristic parameter with the parameter of the existing target object to obtain a detection result;
and 4, transmitting the identified detection result to a display terminal.
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