CN111624672A - Human body security check system based on frequency division multiplexing technology - Google Patents
Human body security check system based on frequency division multiplexing technology Download PDFInfo
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/005—Prospecting or detecting by optical means operating with millimetre waves, e.g. measuring the black losey radiation
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
Abstract
The invention provides a human body security check system based on a frequency division multiplexing technology, which comprises an emission source module, a switch selection module, an emission module array, a receiving module array and an inspection module, wherein the emission source module is used for emitting a first step frequency continuous wave signal and a second step frequency continuous wave signal; the switch selection module is used for receiving the first further frequency continuous wave signal and distributing the first further frequency continuous wave signal. The transmitting module array adopts the frequency division multiplexing technology and transmits in multiple paths, the receiving module array receives echo signals in multiple paths, multiple receiving and multiple sending of detection waves are achieved, the system sampling time is shortened, the real-time performance of the active human body security check system is improved, and the intelligent detection module improves the intelligence and the accuracy of the active human body security check system by adopting the deep learning technology.
Description
Technical Field
The invention belongs to the field of human body security check systems, and particularly relates to a human body security check system based on a frequency division multiplexing technology.
Background
The current human body security inspection technologies mainly comprise a metal detector, an X-ray human body security inspection instrument, a millimeter wave/terahertz human body security inspection instrument and the like. The metal detector adopts a metal coil to generate an alternating electromagnetic field, when a metal object exists in a detected area, the electromagnetic field is disturbed by the metal object, and the disturbance is sensed by the metal coil for receiving signals, so that the metal object is detected. The X-ray human body security check instrument irradiates a human body by adopting micro-dose X-rays, detects back scattering or transmission X-ray signals of the human body, and finds hidden objects carried on the surface of the human body according to different distribution of signal intensity. The millimeter wave/terahertz human body security inspection instrument is divided into an active type and a passive type, wherein the active type adopts micro-power millimeter wave/terahertz radiation to irradiate a human body and detect scattering echoes of the human body, then a detection area image is reconstructed through a specific imaging algorithm, and the passive type directly utilizes the self thermal radiation of the human body to carry out passive imaging so as to realize the detection of carrying hidden objects on the surface of the human body.
It is well known that the resolution of an imaging system is proportional to its aperture size, with larger apertures giving higher resolution. The passive security imaging adopts an optical means, the caliber of the passive security imaging is limited by the size of a mirror surface, and is often smaller than 0.5m, so that the passive security imaging is difficult to further improve. The active security inspection imaging usually adopts a synthetic aperture radar means, an effective large-caliber size is synthesized through a two-dimensional array or mechanical scanning, the caliber size larger than 1m can be easily realized, in addition, the active imaging has a transmitting source and performs coherent detection, and the signal-to-noise ratio is far higher than that of passive imaging, so that the active millimeter wave/terahertz security inspection imaging has irreplaceable advantages in the future high-accuracy human body security inspection field.
However, the existing active millimeter wave/terahertz security inspection system has poor real-time performance, long detection time when the detected object is subjected to security inspection, and poor detection effect of the active millimeter wave/terahertz security inspection, so that the security inspection accuracy of the security inspection system is low.
Disclosure of Invention
Aiming at the problems, the invention provides a human body security check system based on frequency division multiplexing technology.
A human body security check system based on frequency division multiplexing technology comprises a transmission source module, a switch selection module, a transmission module array, a receiving module array and a check module,
the emission source module is used for emitting a first step frequency continuous wave signal and a second step frequency continuous wave signal;
the switch selection module is used for receiving the first further frequency continuous wave signal and distributing the first further frequency continuous wave signal;
the transmitting module array is used for receiving the distributed first step frequency continuous wave signals, performing first signal processing on the first step frequency continuous wave signals to obtain detection waves, and sending the detection waves to a measured object to generate echo signals;
the receiving module array is used for receiving the echo signal and the second stepped frequency continuous wave signal and performing second signal processing on the echo signal and the second stepped frequency continuous wave signal to obtain an intermediate frequency signal;
the inspection module is used for receiving the intermediate frequency signal, performing analog-to-digital conversion, fast Fourier operation, selective differentiation processing, digital IQ demodulation and imaging calculation operation on the intermediate frequency signal to obtain a human body three-dimensional complex image, detecting the human body three-dimensional complex image and feeding back a detection result.
Preferably, the radiation source module comprises an array of frequency modules,
the frequency module array comprises a plurality of frequency sources, each frequency source is used for generating the first stepped frequency continuous wave signal and the second stepped frequency continuous wave signal;
the first stepped frequency continuous wave signal and the second stepped frequency continuous wave signal have a fixed frequency difference.
Preferably, the switch selection module comprises a multi-way switch module,
each switch module is used for receiving the first further frequency continuous wave signal and distributing the first further frequency continuous wave signal.
Preferably, the transmitting module array comprises a plurality of transmitting channels,
the number of the emission channels is consistent with the number of the frequency sources.
Preferably, each of the transmission channels includes a first frequency multiplication chain, a first filter, a first amplifier and a transmission antenna,
the first frequency multiplication link is configured to receive the distributed first further-frequency continuous wave signal, and perform frequency multiplication processing on the first further-frequency continuous wave signal to obtain a first frequency multiplication signal;
the first filter is configured to receive the first frequency multiplication signal, and filter the first frequency multiplication signal to obtain a first filtered signal;
the first amplifier is used for receiving the first filtering signal and performing power amplification processing on the first filtering signal to obtain the detection wave;
the transmitting antenna is used for receiving the detection wave and transmitting the detection wave to a measured object to generate the echo signal,
and the first frequency multiplication link, the first filter and the first amplifier jointly complete first signal processing on the first further frequency continuous wave signal.
Preferably, the receiving module array includes a power division network and multiple receiving channels,
the power division network is configured to receive the second stepped frequency continuous wave signal, and power divide the second stepped frequency continuous wave signal to generate multiple paths of the second stepped frequency continuous wave signals;
each receiving channel is used for receiving one path of the second stepped frequency continuous wave signal and the echo signal and preprocessing the second stepped frequency continuous wave signal and the echo signal to obtain the intermediate frequency signal,
and the power division network and each receiving channel jointly act to complete second signal processing on the echo signal and the second stepped frequency continuous wave signal.
Preferably, each of the receiving channels includes a second frequency multiplying chain, a second filter, a receiving antenna, a low noise amplifier, a mixer, a third filter and an intermediate frequency amplifier,
the second frequency doubling link is used for receiving a path of the second stepped frequency continuous wave signal and performing frequency doubling processing on the second stepped frequency continuous wave signal to obtain a second frequency doubling signal;
the second filter is configured to receive the second frequency-multiplied signal, and filter the second frequency-multiplied signal to obtain a second filtered signal;
the receiving antenna is used for receiving and sending the echo signal;
the low-noise amplifier is used for receiving the echo signal and performing low-noise amplification processing on the echo signal to obtain a second amplified signal;
the mixer is configured to receive the second amplified signal and the second filtered signal, and perform mixing processing on the second amplified signal and the second filtered signal to obtain a mixed signal;
the third filter is configured to receive the mixed signal, and filter the mixed signal to obtain a third filtered signal;
the intermediate frequency amplifier is used for receiving the third filtering signal and carrying out intermediate frequency amplification processing on the third filtering signal to obtain an intermediate frequency signal,
the second frequency doubling link, the second filter, the low noise amplifier, the mixer, the third filter and the intermediate frequency amplifier cooperate to complete the preprocessing of the second stepped frequency continuous wave signal and the echo signal.
Preferably, the emission source module further comprises a timing control module,
and the time sequence control module is used for generating the time sequence pulse and sending the time sequence pulse to the frequency module array, the transmitting module array and the signal acquisition module to realize time synchronization.
Preferably, the checking module comprises a signal acquisition module, a signal processing module, an intelligent detection module and a human-computer interface module,
the signal acquisition module is used for receiving the intermediate frequency signal, performing analog-to-digital conversion processing on the intermediate frequency signal and generating a digital signal;
the signal processing module is used for receiving the digital signals, processing the digital signals by adopting fast Fourier operation, selectively distinguishing and processing the signals after the fast Fourier operation, acquiring the digital signals corresponding to different receiving and transmitting channels under different frequency points, simultaneously generating digital intermediate frequency local oscillator signals according to the time sequence pulse, realizing digital IQ demodulation of the digital signals, obtaining digital IQ signals under different channels and frequency points, and combining the digital IQ signals into an imaging algorithm to obtain the three-dimensional complex image of the human body;
the intelligent detection module is used for detecting the human body three-dimensional complex image, marking the position and the type of the hidden object in the human body three-dimensional complex image and outputting the detection result;
and the human-computer interface module is used for receiving the detection result and displaying the detection result.
A human body security check method based on frequency division multiplexing technology comprises the following steps:
transmitting a first step frequency continuous wave signal and a second step frequency continuous wave signal;
receiving the first further frequency continuous wave signal, and distributing the first further frequency continuous wave signal;
receiving the distributed first step frequency continuous wave signal, performing first signal processing on the first step frequency continuous wave signal to obtain a detection wave, and sending the detection wave to a detected object to generate an echo signal;
receiving the echo signal and the second stepped frequency continuous wave signal, and performing second signal processing on the echo signal and the second stepped frequency continuous wave signal to obtain an intermediate frequency signal;
receiving the intermediate frequency signal, performing analog-to-digital conversion, fast Fourier operation, selective discrimination processing, digital IQ demodulation and imaging calculation on the intermediate frequency signal to obtain a three-dimensional complex image of the human body, detecting the three-dimensional complex image of the human body, and feeding back a detection result.
The transmitting module array adopts the frequency division multiplexing technology and transmits in multiple paths, the receiving module array receives echo signals in multiple paths, multiple receiving and multiple sending of detection waves are achieved, the system sampling time is shortened, the real-time performance of the active human body security check system is improved, and the intelligent detection module improves the intelligence and the accuracy of the active human body security check system by adopting the deep learning technology.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 shows a schematic diagram of the security system of the present invention;
FIG. 2 shows a schematic diagram of an array of transmit modules of the present invention;
FIG. 3 shows a schematic diagram of the switch selection module of the present invention;
fig. 4 shows a schematic diagram of an array of open receiving modules of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The human body security check system based on the frequency division multiplexing technology is suitable for the detection requirement of normal walking passing personnel in a pass-through security check scene, when a detected object reaches a specified region to be detected, the security check system is automatically started, wherein each transmitting channel in a transmitting module array works at a preset initial frequency point.
As shown in fig. 1, after the security inspection system is started, the transmission source module operates to transmit the first step frequency continuous wave signal and the second step frequency continuous wave signal.
Specifically, the emission source module comprises a time sequence control module, the time sequence control module is used for generating the time sequence pulse and sending the time sequence pulse to the frequency module array, the emission module array and the signal acquisition module to realize time synchronization, and the time sequence control module adopts an FPGA platform to generate a series of time sequence pulses and accurately control the clock and the working sequence of each subsystem.
Specifically, the emission source module further includes a frequency module array, the frequency module array includes multiple frequency sources, each of the frequency sources generates a first stepped frequency continuous wave signal with different frequencies and a second stepped frequency continuous wave signal with the same frequency, where the first stepped frequency continuous wave signal and the second stepped frequency continuous wave signal have a fixed frequency difference, the frequency source sends the first stepped frequency continuous wave signal with different frequencies to the emission module array, and sends the second stepped frequency continuous wave signal with the same frequency to the reception module array, so as to provide a transmission signal required by the emission module array and a local oscillation signal required by the reception module array.
Each frequency source generates a first step frequency continuous wave signal and a second step frequency continuous wave signal, the starting time and the initial phase of the first step frequency continuous wave signal and the second step frequency continuous wave signal are controlled by the time sequence control module, the frequency points emitted by different frequency sources at the same time are different, and the working frequency bands of different frequency sources can be overlapped and also can be mutually different.
Further, the switch selection module receives the first further frequency continuous wave signal and distributes the first further frequency continuous wave signal.
Specifically, as shown in fig. 3, the switch selection module includes multiple switch modules, each of the switch modules receives the first further frequency continuous wave signal and distributes the first further frequency continuous wave signal, each of the switch modules receives the first further frequency continuous wave signal generated by the frequency source, each of the switch selection modules is controlled according to a transmission source preset by the system, and distributes a single and unique frequency source to different transmission channels, and under a special condition, the same frequency source signal may be distributed to multiple transmission modules, but multiple transmission modules having the same frequency source signal do not operate simultaneously.
Further, the transmitting module array receives the distributed first step frequency continuous wave signal, performs first signal processing on the first step frequency continuous wave signal to obtain a probe wave, and transmits the probe wave to the object to be measured to generate an echo signal, wherein the transmitting module array may be a one-dimensional array or a multi-dimensional array.
Specifically, the transmitting module array includes multiple transmitting channels, each transmitting channel is configured to receive each first step frequency continuous wave signal, perform first signal processing on each step frequency continuous wave signal to obtain a probe wave, send the probe wave to a measured object, and generate an echo signal, where the number of the transmitting channels is equal to the number of the frequency sources;
each transmitting module is provided with a frequency source input, the frequency source of each transmitting module can be switched, but the frequency sources of different transmitting modules are different at the same time, and different transmitting modules transmit frequency source signals to the tested object through the transmitting antenna.
Specifically, as shown in fig. 2, each of the transmission channels includes a first frequency multiplication link, a first filter, a first amplifier, and a transmission antenna; the first frequency multiplication link is configured to receive the distributed first further-frequency continuous wave signal, and perform frequency multiplication processing on the first further-frequency continuous wave signal to obtain a first frequency multiplication signal; the first filter is configured to receive the first frequency multiplication signal, and filter the first frequency multiplication signal to obtain a first filtered signal; the first amplifier is used for receiving the first filtering signal and performing power amplification processing on the first filtering signal to obtain the detection wave; and the transmitting antenna is used for receiving the detection wave, transmitting the detection wave to a measured object and generating the echo signal.
And the first frequency multiplication link, the first filter and the first amplifier jointly complete first signal processing on the first further frequency continuous wave signal.
The transmitting channel can adopt a radio frequency complementary metal oxide semiconductor chip.
The transmitting module array adopts the frequency division multiplexing technology, so that simultaneous working of multiple transmitting channels is realized, and the real-time performance of the active human body security check system is improved.
Further, the receiving module array receives the echo signal and the second stepped frequency continuous wave signal, the receiving module array has the same second stepped frequency continuous wave signal input, and second signal processing is performed on the echo signal and the second stepped frequency continuous wave signal to obtain an intermediate frequency signal;
the receiving module array may be a one-dimensional array or a multi-dimensional array.
Specifically, the receiving module array includes a power division network and multiple receiving channels, where the power division network is configured to receive the second stepped frequency continuous wave signal, and power divide the second stepped frequency continuous wave signal to generate multiple second stepped frequency continuous wave signals; each receiving channel is configured to receive one path of the second stepped frequency continuous wave signal and the echo signal, and preprocess the second stepped frequency continuous wave signal and the echo signal to obtain the intermediate frequency signal.
And the power division network and each receiving channel jointly act to complete second signal processing on the echo signal and the second stepped frequency continuous wave signal.
As shown in fig. 4, each receiving channel includes a second frequency doubling link, a second filter, a receiving antenna, a low-noise amplifier, a mixer, a third filter, and an intermediate frequency amplifier, where the second frequency doubling link is configured to receive a second stepped frequency continuous wave signal and perform frequency doubling processing on the second stepped frequency continuous wave signal to obtain a second frequency doubling signal, the second filter is configured to receive the second frequency doubling signal and filter the second frequency doubling signal to obtain a second filtered signal, the receiving antenna is configured to receive and transmit the echo signal, the low-noise amplifier is configured to receive the echo signal and perform low-noise amplification processing on the echo signal to obtain a second amplified signal, and the mixer is configured to receive the second amplified signal and the second filtered signal and perform frequency mixing processing on the second amplified signal and the second filtered signal, and the intermediate frequency amplifier is used for receiving the third filtering signal and performing intermediate frequency amplification processing on the third filtering signal to obtain the intermediate frequency signal.
The second frequency doubling link, the second filter, the low noise amplifier, the mixer, the third filter and the intermediate frequency amplifier cooperate to complete the preprocessing of the second stepped frequency continuous wave signal and the echo signal.
The receiving channel can adopt a radio frequency complementary metal oxide semiconductor chip.
Wherein, transmitting antenna and receiving antenna one side all are provided with the antenna house, the antenna house is for more than 95% and have enough structural strength and homogeneity the material of system's operating frequency band transmissivity and constitute.
Further, the inspection module receives the intermediate frequency signal, performs analog-to-digital conversion, fast fourier operation, selective differentiation processing, digital IQ demodulation, and imaging calculation on the intermediate frequency signal to obtain a three-dimensional complex image of the human body, detects the three-dimensional complex image of the human body, and feeds back a detection result.
Specifically, the inspection module comprises a signal acquisition module, a signal processing module, an intelligent detection module and a human-computer interface module.
The signal acquisition module receives the intermediate frequency signal and performs analog-to-digital conversion on the intermediate frequency signal to obtain a digital signal, and the signal acquisition module is an analog-to-digital converter and can acquire the intermediate frequency signals of all receiving channels simultaneously.
The signal processing module comprises a signal processing algorithm and a signal processing hardware platform, the signal processing algorithm comprises fast Fourier operation and an imaging processing algorithm, and the operations of fast Fourier operation, signal selection and distinction, digital IQ demodulation, digital filtering, channel correction, image reconstruction and the like of the digital signals are completed after the digital signals are received, so that three-dimensional complex images of the human body are obtained, and therefore real-time imaging of people in the process of travelling is achieved.
The signal processing hardware platform is a signal processing board card which takes a DSP chip as a core and is made of hardware such as an AD chip, an operational amplifier chip, an MCU chip and the like.
The intelligent detection module detects the human body three-dimensional complex image, marks the position and the type of the hidden object in the human body three-dimensional complex image and outputs the detection result, and the intelligent detection module adopts a deep learning framework to directly carry out intelligent identification on the hidden object based on the three-dimensional complex image.
The intelligent detection module improves the intelligence and the accuracy of the active human body security check system by adopting a deep learning technology.
Further, the human-computer interface module receives the detection result, displays the detection result, informs an operator of the detection result through one or a combination of several means of image, sound, optics, terminal pushing and the like, and realizes the control and setting of the machine by the operator.
And after the detection is finished, the system is restored to a reset state to prepare for next security inspection.
The invention also provides a human body security check method based on the frequency division multiplexing technology on the basis of the human body security check system based on the frequency division multiplexing technology, and the security check method comprises the following steps:
transmitting a first step frequency continuous wave signal and a second step frequency continuous wave signal;
receiving the first further frequency continuous wave signal, and distributing the first further frequency continuous wave signal;
receiving the distributed first step frequency continuous wave signal, performing first signal processing on the first step frequency continuous wave signal to obtain a detection wave, and sending the detection wave to a detected object to generate an echo signal;
the first signal processing includes:
receiving the distributed first further frequency continuous wave signal, and performing frequency multiplication processing on the first further frequency continuous wave signal to obtain a first frequency multiplication signal;
receiving the first frequency multiplication signal, and filtering the first frequency multiplication signal to obtain a first filtered signal;
receiving the first filtering signal, and performing power amplification processing on the first filtering signal to obtain the detection wave;
receiving the detection wave, sending the detection wave to a measured object, and generating the echo signal;
receiving the echo signal and the second stepped frequency continuous wave signal, and performing second signal processing on the echo signal and the second stepped frequency continuous wave signal to obtain an intermediate frequency signal;
the second signal processing includes:
receiving the second stepped frequency continuous wave signal, and dividing the second stepped frequency continuous wave signal to generate a plurality of paths of second stepped frequency continuous wave signals;
receiving a path of the second step frequency continuous wave signal and the echo signal, and preprocessing the second step frequency continuous wave signal and the echo signal to obtain an intermediate frequency signal;
the pretreatment comprises the following steps:
receiving a second stepped frequency continuous wave signal, and performing frequency multiplication processing on the second stepped frequency continuous wave signal to obtain a second frequency multiplication signal;
receiving the second frequency multiplication signal, and filtering the second frequency multiplication signal to obtain a second filtered signal;
receiving and transmitting the echo signal;
receiving the echo signal, and performing low-noise amplification processing on the echo signal to obtain a second amplified signal;
receiving the second amplified signal and the second filtered signal, and performing frequency mixing processing on the second amplified signal and the second filtered signal to obtain a frequency mixed signal;
receiving the mixing signal, and filtering the mixing signal to obtain a third filtering signal;
receiving the third filtering signal, and performing intermediate frequency amplification processing on the third filtering signal to obtain an intermediate frequency signal;
receiving the intermediate frequency signal, performing analog-to-digital conversion, fast Fourier operation, selective discrimination processing, digital IQ demodulation and imaging calculation operation on the intermediate frequency signal to obtain a three-dimensional complex image of the human body, detecting the three-dimensional complex image of the human body, and feeding back a detection result;
the operations of performing analog-to-digital conversion, fast Fourier operation, selective differentiation processing, digital IQ demodulation and imaging calculation on the intermediate frequency signal comprise:
receiving the intermediate frequency signal, and performing analog-to-digital conversion processing on the intermediate frequency signal to generate a digital signal;
receiving the digital signals, processing the digital signals by adopting fast Fourier operation, selectively distinguishing and processing the digital signals after the fast Fourier operation, acquiring the digital signals corresponding to different receiving and transmitting channels under different frequency points, simultaneously generating digital intermediate frequency local oscillator signals according to the time sequence pulse, demodulating digital IQ of the digital signals to obtain digital IQ signals under different channels and frequency points, and combining the digital IQ signals under different channels and frequency points with an imaging algorithm to obtain the three-dimensional complex image of the human body;
the method for detecting the human body three-dimensional complex image comprises the following steps of:
detecting the human body three-dimensional complex image, marking the position and the type of the concealed article in the human body three-dimensional complex image, and outputting the detection result;
and receiving the detection result and displaying the detection result.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A human body security check system based on frequency division multiplexing technology is characterized in that,
the security inspection system comprises an emission source module, a switch selection module, an emission module array, a receiving module array and an inspection module,
the emission source module is used for emitting a first step frequency continuous wave signal and a second step frequency continuous wave signal;
the switch selection module is used for receiving the first further frequency continuous wave signal and distributing the first further frequency continuous wave signal;
the transmitting module array is used for receiving the distributed first step frequency continuous wave signals, performing first signal processing on the first step frequency continuous wave signals to obtain detection waves, and sending the detection waves to a measured object to generate echo signals;
the receiving module array is used for receiving the echo signal and the second stepped frequency continuous wave signal and performing second signal processing on the echo signal and the second stepped frequency continuous wave signal to obtain an intermediate frequency signal;
the inspection module is used for receiving the intermediate frequency signal, performing analog-to-digital conversion, fast Fourier operation, selective differentiation processing, digital IQ demodulation and imaging calculation operation on the intermediate frequency signal to obtain a human body three-dimensional complex image, detecting the human body three-dimensional complex image and feeding back a detection result.
2. The security inspection system of claim 1, wherein the transmission source module comprises an array of frequency modules,
the frequency module array comprises a plurality of frequency sources, each frequency source is used for generating the first stepped frequency continuous wave signal and the second stepped frequency continuous wave signal;
the first stepped frequency continuous wave signal and the second stepped frequency continuous wave signal have a fixed frequency difference.
3. The security system of claim 1, wherein the switch selection module comprises a multiplex switch module,
each switch module is used for receiving the first further frequency continuous wave signal and distributing the first further frequency continuous wave signal.
4. The security system of claim 1 or 2, wherein the array of transmit modules comprises a plurality of transmit channels,
the number of the emission channels is consistent with the number of the frequency sources.
5. The security system of claim 1, wherein each of the transmit channels comprises a first frequency multiplier chain, a first filter, a first amplifier, and a transmit antenna,
the first frequency multiplication link is configured to receive the distributed first further-frequency continuous wave signal, and perform frequency multiplication processing on the first further-frequency continuous wave signal to obtain a first frequency multiplication signal;
the first filter is configured to receive the first frequency multiplication signal, and filter the first frequency multiplication signal to obtain a first filtered signal;
the first amplifier is used for receiving the first filtering signal and performing power amplification processing on the first filtering signal to obtain the detection wave;
the transmitting antenna is used for receiving the detection wave and transmitting the detection wave to a measured object to generate the echo signal,
and the first frequency multiplication link, the first filter and the first amplifier jointly complete first signal processing on the first further frequency continuous wave signal.
6. The security inspection system of claim 1, wherein the receiving module array comprises a power division network and multiple receiving channels,
the power division network is configured to receive the second stepped frequency continuous wave signal, and power divide the second stepped frequency continuous wave signal to generate multiple paths of the second stepped frequency continuous wave signals;
each receiving channel is used for receiving one path of the second stepped frequency continuous wave signal and the echo signal and preprocessing the second stepped frequency continuous wave signal and the echo signal to obtain the intermediate frequency signal,
and the power division network and each receiving channel jointly act to complete second signal processing on the echo signal and the second stepped frequency continuous wave signal.
7. The security system of claim 6, wherein each of said receive channels comprises a second multiplying chain, a second filter, a receive antenna, a low noise amplifier, a mixer, a third filter, and an intermediate frequency amplifier,
the second frequency doubling link is used for receiving a path of the second stepped frequency continuous wave signal and performing frequency doubling processing on the second stepped frequency continuous wave signal to obtain a second frequency doubling signal;
the second filter is configured to receive the second frequency-multiplied signal, and filter the second frequency-multiplied signal to obtain a second filtered signal;
the receiving antenna is used for receiving and sending the echo signal;
the low-noise amplifier is used for receiving the echo signal and performing low-noise amplification processing on the echo signal to obtain a second amplified signal;
the mixer is configured to receive the second amplified signal and the second filtered signal, and perform mixing processing on the second amplified signal and the second filtered signal to obtain a mixed signal;
the third filter is configured to receive the mixed signal, and filter the mixed signal to obtain a third filtered signal;
the intermediate frequency amplifier is used for receiving the third filtering signal and carrying out intermediate frequency amplification processing on the third filtering signal to obtain an intermediate frequency signal,
the second frequency doubling link, the second filter, the low noise amplifier, the mixer, the third filter and the intermediate frequency amplifier cooperate to complete the preprocessing of the second stepped frequency continuous wave signal and the echo signal.
8. The security inspection system of claim 1 or 2, wherein the transmission source module further comprises a timing control module,
and the time sequence control module is used for generating time sequence pulses and sending the time sequence pulses to the frequency module array, the transmitting module array and the signal acquisition module to realize time synchronization.
9. The security inspection system of claim 8, wherein the inspection module comprises a signal acquisition module, a signal processing module, a smart detection module, and a human-machine interface module,
the signal acquisition module is used for receiving the intermediate frequency signal, performing analog-to-digital conversion processing on the intermediate frequency signal and generating a digital signal;
the signal processing module is used for receiving the digital signals, processing the digital signals by adopting fast Fourier operation, selectively distinguishing and processing the digital signals after the fast Fourier operation, acquiring the digital signals corresponding to different receiving and transmitting channels under different frequency points, simultaneously generating digital intermediate frequency local oscillator signals according to the time sequence pulses, demodulating digital IQ of the digital signals to obtain digital IQ signals under different channels and frequency points, and combining the digital IQ signals under different channels and frequency points with an imaging algorithm to obtain the three-dimensional complex image of the human body;
the intelligent detection module is used for detecting the human body three-dimensional complex image, marking the position and the type of the hidden object in the human body three-dimensional complex image and outputting the detection result;
and the human-computer interface module is used for receiving the detection result and displaying the detection result.
10. A human body security check method based on frequency division multiplexing technology is characterized by comprising the following steps:
transmitting a first step frequency continuous wave signal and a second step frequency continuous wave signal;
receiving the first further frequency continuous wave signal, and distributing the first further frequency continuous wave signal;
receiving the distributed first step frequency continuous wave signal, performing first signal processing on the first step frequency continuous wave signal to obtain a detection wave, and sending the detection wave to a detected object to generate an echo signal;
receiving the echo signal and the second stepped frequency continuous wave signal, and performing second signal processing on the echo signal and the second stepped frequency continuous wave signal to obtain an intermediate frequency signal;
receiving the intermediate frequency signal, performing analog-to-digital conversion, fast Fourier operation, selective discrimination processing, digital IQ demodulation and imaging calculation on the intermediate frequency signal to obtain a three-dimensional complex image of the human body, detecting the three-dimensional complex image of the human body, and feeding back a detection result.
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