CN212647023U - Single-point scanning millimeter wave security inspection system - Google Patents
Single-point scanning millimeter wave security inspection system Download PDFInfo
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Abstract
The invention relates to the technical field of security inspection, and particularly discloses a millimeter wave security inspection system for single-point scanning, which comprises a rack, a triangular metal reflecting rotating mirror, a single-point scanning module positioned right above the triangular metal reflecting rotating mirror, a signal acquisition and processing module, an imaging display module connected with the signal acquisition and processing module, an automatic identification module connected with the imaging display module, a scanning driving mechanism capable of driving the single-point scanning module to move, and a rotation driving mechanism capable of driving the triangular metal reflecting rotating mirror to rotate, wherein the signal acquisition and processing module is positioned above the triangular metal reflecting rotating mirror; the triangular metal reflecting rotary mirror is rotatably connected to the frame; the single-point scanning module can be movably connected to the rack along the length direction of the triangular metal reflecting rotary mirror; the single-point scanning module comprises a millimeter wave source and a millimeter wave detector, wherein the millimeter wave source can transmit millimeter waves to the triangular metal reflecting rotating mirror. The invention adopts the single-point scanning and synthetic aperture holographic imaging principle, simplifies the machinery and electronic circuits and reduces the cost; the open detection area space improves the safety and the comfort of the security inspection.
Description
Technical Field
The invention relates to the technical field of security check, in particular to a millimeter wave security check system for single-point scanning.
Background
With the rapid increase of the people flow and terrorist activities in large public places, the requirement of human body security inspection is increasing day by day. However, the safety detection means widely used for human bodies in public places such as airports, stations and the like are mainly metal detectors, ion spectrometers and X-ray detectors. The metal detector can only detect metal objects carried by a human body, the ion spectrometer is mainly used for detecting whether the human body carries explosives, and the X-ray detector is mainly used for detecting luggage objects and the like carried about and cannot detect the human body. Therefore, the research on the novel safe, reliable and quick human body security inspection technology is widely regarded. Among them, millimeter wave and terahertz wave technologies have gradually become research hotspots in recent years and are applied to the field of human body security inspection. Millimeter wave and terahertz wave have low photon energy, almost do not harm human bodies, have better penetrability to materials such as textiles and leather, and are easy to obtain higher spatial resolution.
Aiming at the application trend, the invention patent application with the application number of 201710778390.9 and the name of active terahertz security inspection imaging method and system provides a method and a system for security inspection by adopting terahertz waves. The patent adopts the modes of terahertz source active emission terahertz radiation, one-dimensional scanning of strip-shaped focusing beams and linear array terahertz detector receiving to finish irradiation and scanning of the whole target plane, thereby achieving the purpose of target imaging and inspection. However, the number of detectors required by the method and the system is large, and the system cost is extremely high and is difficult to popularize because the conventional terahertz device is expensive. Therefore, the invention patent application with the application number of 201510376894.9 and the name of terahertz human body security inspection system and security inspection method provides a terahertz wave security inspection method and system for single-point scanning by adopting a drum-type multi-surface reflecting rotating mirror. The patent adopts a single-point scanning mode, and completes the irradiation and scanning of the whole target plane in a mode of focusing and imaging by the reflecting rotating mirror and the plurality of concave mirrors, thereby achieving the purpose of imaging and checking the target. Although the number of detection modules is reduced, the method and the system have the following disadvantages: the method of optical focusing imaging greatly increases the complexity of the system in the aspects of optical machinery and electronic circuits, and has low detection precision. Therefore, it is not very practical.
In addition, the invention patent with patent number 201610262003.1 and named three-dimensional holographic imaging security inspection system and method needs to realize security inspection imaging in a closed space, and has the advantages of large occupied space, complex structure, high manufacturing cost, and poor user experience and safety.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the millimeter wave security inspection system and the millimeter wave security inspection method for single-point scanning, which have the advantages of simple structure, high detection precision, low cost, space development and good user experience.
In order to achieve the purpose, the invention adopts the following technical scheme: a millimeter wave security inspection system for single-point scanning comprises a frame;
the triangular metal reflecting rotating mirror can reflect millimeter waves and is rotatably connected to the rack;
the single-point scanning module is positioned right above the triangular metal reflecting rotating mirror and can be movably connected to the rack along the length direction of the triangular metal reflecting rotating mirror; the single-point scanning module comprises a millimeter wave source capable of transmitting millimeter waves to the triangular metal reflecting rotary mirror and a millimeter wave detector for receiving millimeter wave reflected signals;
the detection area is used for a person to be detected to stand on, is positioned on the side surface of the triangular metal reflection rotating mirror and can receive millimeter waves reflected by the triangular metal reflection rotating mirror;
the signal acquisition processing module is connected with the millimeter wave detector and is used for acquiring and processing signals transmitted by the millimeter wave detector;
the imaging display module is connected with the signal acquisition and processing module, performs image reconstruction on the processed signals to synthesize a three-dimensional image, and performs differential display on different objects;
the automatic identification module is connected with the imaging display module, performs artificial intelligent operation on the acquired image data, and automatically performs forbidden articles judgment prompt;
the scanning driving mechanism is connected with the single-point scanning module and can drive the single-point scanning module to move;
the rotary driving mechanism is connected with the triangular metal reflecting rotating mirror and can drive the triangular metal reflecting rotating mirror to rotate;
the control module is connected with the scanning driving mechanism and the rotating driving mechanism and is connected with the imaging display module;
the control module can conveniently control the coordination work of the modules. The imaging display module can display the finally synthesized panoramic image in a distinguishing way aiming at different objects so as to adapt to different working requirements. The automatic identification module also provides an artificial intelligence algorithm, compares the detection image with a contraband image database, and carries out automatic identification and prompt on the degree of danger of the detection image, so that omission of manual detection is prevented.
When the device is used, only one single-point scanning module is needed to move along the rack, so that the device can move to carry out comprehensive scanning on the personnel to be detected, and the device has the advantages of few required parts, flexible use and strong practicability; the method for reflecting millimeter waves by rotating the triangular metal reflecting rotary mirror at high speed finally completes three-dimensional holographic scanning imaging of the millimeter waves, and by means of the synthetic aperture imaging principle, required scanning components are greatly reduced on the premise that scanning imaging precision is guaranteed, meanwhile, a detection area presents a development space, and safety and comfort of a target to be detected are greatly improved.
Furthermore, the scanning driving mechanism comprises a screw rod extending along the length direction of the triangular metal reflecting rotary mirror, a nut sleeved outside the screw rod, and a first motor connected with the screw rod and capable of driving the screw rod to rotate and driving the nut to move; the screw rod is rotatably connected to the rack; the single-point scanning module is connected to the nut. The design structure is simple, and the using effect is good.
Further, the rotary driving mechanism comprises a rotary shaft which is rotatably connected to the frame, and a second motor which is connected to the rotary shaft and can drive the rotary shaft to rotate. The design structure is simple, and the using effect is good.
Furthermore, a metal detection plate used for a person to be detected to stand is arranged in the detection area, and the metal detection plate is connected with the automatic identification module.
Furthermore, a wave absorbing plate for providing a good gray background image for subsequent detection imaging is arranged on one side of the detection area opposite to the three-edged metal reflecting rotating mirror. And the later background processing is convenient.
Furthermore, the number of the detection areas is two, and the two detection areas are respectively located on two sides of the three-edged metal reflecting rotating mirror. The three-edged metal reflecting rotary mirror can be used for detecting the personnel to be detected on two sides of the three-edged metal reflecting rotary mirror at the same time, and the working efficiency is high.
In addition, the invention also provides a millimeter wave security inspection method of single-point scanning, which comprises the following steps:
(a) a preparation stage: starting a system, guiding the personnel to be tested to stand on the detection area respectively, and keeping a fixed posture to be fixed according to the prompting surface;
(b) scanning and imaging: the control module controls the rotation driving mechanism to move to drive the triangular metal reflection rotating mirror to rotate at a high speed, meanwhile, the control module controls the scanning driving mechanism right above the triangular metal reflection rotating mirror to drive the single-point scanning module to move along the length direction of the triangular metal reflection rotating mirror, millimeter waves emitted by a millimeter wave source on the single-point scanning module are reflected by the triangular metal reflection rotating mirror to scan a person to be detected, and then the millimeter waves are returned to a millimeter wave detector of the single-point scanning module, so that millimeter wave scanning imaging of the whole body of a human body is realized;
(c) image synthesis: the millimeter wave signals received by the millimeter wave detector are collected and processed through the signal collecting and processing module, and then all the signals are synthesized through the imaging display module according to the synthetic aperture holographic imaging principle to be spliced into a panoramic front image;
(d) turning over and detecting: the person to be detected turns back to repeat the steps (b) and (c) on the triangular metal reflecting rotating mirror to complete the panoramic back image detection, and an imaging display module synthesizes a three-dimensional image of the human body to be detected and displays the three-dimensional image in a distinguishing way aiming at different objects;
(e) automatic identification: and carrying out artificial intelligence algorithm processing according to the obtained image, comparing the image with a standard image database of contraband, and giving out identification information and safety prompt through an automatic identification module.
The method can effectively finish the safety inspection work of the human body in public places, well guarantees the dignity of the personnel to be detected on the premise of reducing the false inspection rate and the omission factor as much as possible, has low detection cost, comprehensive safety inspection information acquisition and high detection accuracy, and is particularly suitable for being popularized in various safety inspection application scenes.
Furthermore, in the step (b), when two persons to be detected are positioned on two sides of the triangular metal reflecting rotating mirror for simultaneous detection, the imaging display module can automatically judge the attribution of the detection signal through the angle position of the triangular metal reflecting rotating mirror.
In conclusion, the invention only needs one single-point scanning module and scans the personnel to be detected at two sides by the rotation of the triangular metal reflecting rotating mirror, so that the detection precision and the working efficiency are high; and simple structure, low in manufacturing cost, excellent in use effect.
Drawings
FIG. 1 is a diagram showing a state of use of embodiment 1 of the present invention;
FIG. 2 is a partial schematic view of embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of example 1 of the present invention;
FIG. 4 is an enlarged view of a part of example 1 of the present invention;
wherein, the frame 1; the device comprises a single-point scanning module 2, a millimeter wave source 21 and a millimeter wave detector 22; a triangular metal reflecting rotary mirror 3; a metal detection plate 41 and a wave absorbing plate 42; a signal acquisition processing module 5; an imaging display module 6; an automatic identification module 7; the scanning driving mechanism 8, a screw rod 81, a nut 82 and a first motor 83; a rotation driving mechanism 9, a rotation shaft 91, and a second motor 92; a control module 10; the person to be tested 100.
Detailed Description
In order that those skilled in the art will better understand the concepts of the present invention, reference will now be made to the following examples
The technical scheme in the embodiment of the invention is clear through the attached drawings,
The complete description.
Example 1
As shown in fig. 1-4, a millimeter wave security inspection system for single-point scanning includes a frame 1, a single-point scanning module 2, a triangular metal reflecting rotary mirror 3, a detection area, a signal acquisition processing module 5, an imaging display module 6, an automatic identification module 7, a scanning driving mechanism 8, a rotation driving mechanism 9, and a control module 10.
Specifically, the triangular metal reflecting rotary mirror 3 can reflect millimeter waves, wherein the millimeter waves can also be terahertz waves. The triangular metal reflecting rotary mirror 3 is rotatably connected to the frame 1. The single-point scanning module 2 is located right above the triangular metal reflecting rotary mirror 3, the single-point scanning module 2 is movably connected to the rack 1, and the moving direction of the single-point scanning module 2 moves along the length direction of the triangular metal reflecting rotary mirror 3. The single-point scanning module 2 comprises a millimeter wave source 21 and a millimeter wave detector 22, wherein the millimeter wave source 21 can emit millimeter waves to the triangular metal reflecting rotary mirror 3, and the millimeter wave detector 22 can receive millimeter wave reflected signals. In this example, the millimeter wave source 21 is a millimeter wave source that actively transmits millimeter waves, and the millimeter wave detector 22 is a millimeter wave detector 22 that receives millimeter wave signals. The millimeter waves emitted from the millimeter-wave source 21 are reflected or scattered on the human body to be examined.
The detection zone is used for await measuring personnel 100 to stand, and this detection zone is located three-edged metal reflection rotating mirror 3 sides, and await measuring personnel 100 in the detection zone can receive the millimeter wave of following three-edged metal reflection rotating mirror 3 reflection.
The signal acquisition processing module 5 is connected with the millimeter wave detector 22, and the signal acquisition processing module 5 acquires and processes signals transmitted from the millimeter wave detector 22.
In this example, the signal acquisition module 5 is designed by using a high-speed Digital Signal Processor (DSP) as a core, and is formed by using a texas instruments TMS320VC5509 chip, and a filter circuit, a shaping circuit, an a/D, a memory, a power control, and the like as auxiliary components.
The imaging display module 6 is connected with the signal acquisition processing module 5, and the imaging display module 6 carries out image reconstruction on the processed signals to synthesize a three-dimensional image and carries out differential display on different objects. The automatic identification module 7 is connected with the imaging display module 6, and the automatic identification module 7 carries out artificial intelligence operation on the acquired image data and automatically carries out forbidden articles judgment prompt. In other words, in this example, the signal detection is completed by the millimeter wave detector, and the signal acquisition processing module 5 processes the signal and then converts the signal into a segmented local image signal for subsequent algorithm processing. The imaging display module 6 synthesizes the local images formed by the signal acquisition processing module 5 at different moments to obtain a complete target image.
The imaging display module 6 displays the synthesized panoramic image. Preferably, two-path display output can be adopted, wherein one path of display output is output to a security check personnel console and comprises all imaging information, so that security check personnel can check the imaging information of personnel to be checked in an all-round manner and perform multi-angle analysis processing. And the other path of the signal is output to external display equipment for public environment to watch and display. The signal of the path is in consideration of protecting personal privacy, cartoon figure image simulation display is adopted, and only area prompt processing is carried out on related detection objects.
The automatic identification module 7 is used for carrying out artificial intelligence calculation on the synthesized panoramic image, then comparing the panoramic image with a contraband image database, carrying out automatic identification and prompt on the danger degree of the panoramic image, preventing careless omission of manual detection and achieving the purpose of being careless. If the automatic identification of the individual article is difficult, the security personnel can be prompted to carry out manual reinspection.
In the present example, the above-described imaging display module 6 and automatic recognition module 7 are constituted by a computer with a plurality of display devices. Considering the requirements of real-time image processing and deep learning algorithm, the computer adopts a graphic workstation type, a CPU + GPU structure is adopted as a core component, a 60-core Xeon E74890V 2 CPU and Nvidia Quadro K600012 GB are selected, if the parallel computing capability of the computer needs to be accelerated, a plurality of Nvidia Tesla V100 GPUs can be added, a CUDA parallel computing platform and more than two large-screen displays are assisted, the real-time synthesis and artificial intelligence algorithm judgment of panoramic images can be well completed, and results are presented in different scenes at the same time.
Of course, this is only a partial embodiment and the module may also take other configurations.
The scanning driving mechanism 8 is connected with the single-point scanning module 2, and the scanning driving mechanism 8 can drive the single-point scanning module 2 to move. The rotary driving mechanism 9 is connected with the triangular metal reflecting rotary mirror 3, and the rotary driving mechanism 9 can drive the triangular metal reflecting rotary mirror 3 to rotate. The control module 10 is connected with the scanning driving mechanism 8 and the rotation driving mechanism 9, and the control module 10 is connected with the imaging display module 6.
The structure of the scanning driving mechanism 8 can be designed according to the needs, such as an air cylinder. However, in the present embodiment, the scanning drive mechanism 8 includes a lead screw 81, a nut 82, and a first motor 83. The screw rod 81 extends along the length direction of the triangular metal reflecting rotary mirror 3, and the screw rod 81 is rotatably connected to the frame 1. The nut 82 is sleeved outside the screw rod 81 and is in threaded connection with the screw rod 81. The first motor 83 is connected to the screw 81 and can drive the screw 81 to rotate around the frame 1, thereby driving the nut 82 to move along the screw 81. The single-point scanning module 2 is connected to the nut 82, and thus when the nut moves, the single-point scanning module 2 can be driven to move together.
Similarly, the structure of the rotation driving mechanism 9 can be designed according to the requirement, for example, the rotation driving mechanism 9 includes a rotation shaft 91 and a second motor 92, the rotation shaft 91 is rotatably connected to the frame 1, and the second motor 92 is connected to the rotation shaft 91 and can drive the rotation shaft 91 to rotate around the frame.
In order to avoid scanning leaks, a metal detection plate 41 is arranged in the detection area, the metal detection plate 41 is used for the person 100 to be detected to stand, and the metal detection plate 41 is connected with the automatic identification module 7. The detection result of the metal detection plate 41 can also be directly connected with a security check server, and the detection condition of the metal at the sole is automatically prompted.
Preferably, a wave absorbing plate 42 is arranged on one side of the detection area opposite to the three-edged metal reflecting rotary mirror 3, and the wave absorbing plate 42 provides a good gray background image for subsequent detection imaging. The reasonable placement position of the wave absorbing plate 42 can provide a good imaging background, and lays a foundation for subsequent image processing.
In order to improve the working efficiency, the number of the detection areas is two, and the two detection areas are respectively positioned at two sides of the triangular metal reflecting rotating mirror 3. The millimeter wave can also be a terahertz wave.
In this example, the second motor 92 in the rotation driving mechanism 9 drives the rotation shaft 91 to rotate at a high speed, so as to drive the three-edged metal reflecting rotary mirror 3 to rotate at a high speed; meanwhile, the first motor 83 drives the screw rod 81 to move horizontally, so as to drive the single-point scanning module 2 above to generate a linear motion track for scanning.
Example 2
The present embodiment is a method used in combination with embodiment 1, and is a millimeter wave security inspection method of single-point scanning, and in the present embodiment, the method includes the following steps:
(a) a preparation stage: and starting the system, and guiding the personnel to be detected to stand on the detection area respectively, namely guiding the personnel to be detected to stand on the metal detection plate 41. The three-edged metal reflecting rotary mirror 3 is kept in a fixed posture according to the prompting surface.
In the step, the person to be detected needs to lift both hands to expose the whole body, especially the armpit, so as to ensure the integrity of the detection area.
(b) Scanning and imaging: the control module 10 controls the rotary driving mechanism 8 to move, and the rotary driving mechanism 8 drives the three-edged metal reflecting rotary mirror 3 to rotate at high speed together. Meanwhile, the control module 10 controls the scanning driving mechanism 7 right above the triangular metal reflecting rotary mirror 3 to drive the single-point scanning module 2 to move along the length direction of the triangular metal reflecting rotary mirror 3. Millimeter waves emitted by a millimeter wave source 21 on the single-point scanning module 2 are reflected by the triangular metal reflecting rotary mirror 3 to scan a person to be detected, and then the millimeter waves return to a millimeter wave detector 22 of the single-point scanning module 2, so that millimeter wave scanning imaging of the whole body of the human body is realized.
In the step, in order to improve the working efficiency, the simultaneous measurement of two persons to be measured can be realized, so that the two persons to be measured are positioned on two sides of the triangular metal reflecting rotary mirror 3 for simultaneous detection. At this time, the imaging display module 6 can automatically determine the attribution of the detection signal through the angle position of the triangular metal reflecting rotary mirror 3. In addition, the angle of the triangular metal reflecting rotary mirror 3 and the coordinates of the millimeter wave detector 22 on the screw rod 81 can be automatically recorded in real time, and a mapping equation is established for image synthesis of the detected areas at different moments. Meanwhile, the signals of the object to be detected 100 reflected or scattered from different directions are automatically judged by recording the angle of the reflecting rotating mirror.
(c) Image synthesis: the millimeter wave signals received by the millimeter wave detector 22 are collected and processed by the signal collecting and processing module 5, and then all the signals are synthesized by the imaging and displaying module 6 to be spliced into a panoramic front image.
In the step (c), the imaging display module 6 performs algorithm focusing imaging according to a Synthetic Aperture Radar (SAR) holographic imaging principle. In consideration of the requirements of real-time imaging, the signal acquired by the single-point scanning module 2 is processed by the signal acquisition processing module 5, and the original data is directly projected onto the final imaging plane by adopting a time domain Back Projection (BP) imaging algorithm without positioning operation, so that the obtained image is the scattering intensity of a real three-dimensional space position, and the subsequent synthesis operation is convenient. Preferably, a block BP imaging algorithm can be adopted, the calculation amount of the algorithm is reduced, and real-time imaging can be realized by combining a GPU parallel computing technology.
(d) Turning over and detecting: after the steps are completed, the person to be detected turns back to the triangular metal reflecting rotary mirror 3, the steps (b) and (c) are repeated, the panoramic back image detection is completed, the imaging display module 6 synthesizes a three-dimensional image of the human body to be detected, and different objects are displayed in a distinguishing mode.
(e) Automatic identification: and carrying out artificial intelligence algorithm processing according to the obtained image, comparing the processed image with a standard image database of contraband, and giving out identification information and safety prompt through an automatic identification module 7.
In the step (e), the outline and the gray level of the special object in the panoramic image are comprehensively and intelligently judged through the automatic identification module 7 so as to identify and prompt the suspected attribute or texture of the special object, and the automatic identification and judgment capability of the special object is gradually enhanced through algorithms such as deep learning and the like.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. 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.
Claims (6)
1. The utility model provides a millimeter wave safety inspection system of single-point scanning which characterized in that: comprises a frame (1);
the triangular metal reflecting rotating mirror (3) can reflect millimeter waves, and the triangular metal reflecting rotating mirror (3) can be rotatably connected to the rack (1);
the single-point scanning module (2) is positioned right above the triangular metal reflecting rotating mirror (3), and the single-point scanning module (2) can be movably connected to the rack (1) along the length direction of the triangular metal reflecting rotating mirror (3); the single-point scanning module (2) comprises a millimeter wave source (21) capable of transmitting millimeter waves to the triangular metal reflecting rotary mirror (3) and a millimeter wave detector (22) for receiving millimeter wave reflected signals;
the detection area is used for standing of a person to be detected (100), is positioned on the side surface of the triangular metal reflection rotating mirror (3), and can receive millimeter waves reflected by the triangular metal reflection rotating mirror (3);
the signal acquisition processing module (5) is connected with the millimeter wave detector (22) and is used for acquiring and processing signals transmitted by the millimeter wave detector (22);
the imaging display module (6) is connected with the signal acquisition processing module (5), carries out image reconstruction on the processed signals to synthesize a three-dimensional image, and carries out differential display on different objects;
the automatic identification module (7) is connected with the imaging display module (6), carries out artificial intelligence operation on the acquired image data, and automatically carries out contraband judgment prompt;
a scanning driving mechanism (8) which is connected with the single-point scanning module (2) and can drive the single-point scanning module (2) to move;
a rotary driving mechanism (9) which is connected with the triangular metal reflecting rotary mirror (3) and can drive the triangular metal reflecting rotary mirror (3) to rotate;
a control module (10) connected with the scanning driving mechanism (8) and the rotating driving mechanism (9), wherein the control module (10) is connected with the imaging display module (6);
the number of the detection areas is two, and the two detection areas are respectively positioned on two sides of the three-edged metal reflecting rotating mirror (3).
2. The millimeter wave security inspection system for single-point scanning according to claim 1, wherein: the scanning driving mechanism (8) comprises a screw rod (81) extending along the length direction of the triangular metal reflecting rotary mirror (3), a nut (82) sleeved outside the screw rod (81), and a first motor (83) connected with the screw rod (81) and capable of driving the screw rod (81) to rotate and driving the nut (82) to move; the screw rod (81) is rotatably connected to the rack (1); the single-point scanning module (2) is connected to the nut (82).
3. The millimeter wave security inspection system for single-point scanning according to claim 1, wherein: the rotary driving mechanism (9) comprises a rotary shaft (91) which is rotatably connected to the frame (1), and a second motor (92) which is connected with the rotary shaft (91) and can drive the rotary shaft (91) to rotate.
4. The millimeter wave security inspection system for single-point scanning according to claim 1, wherein: and a metal detection plate (41) for a person to be detected (100) to stand is arranged in the detection area, and the metal detection plate (41) is connected with the automatic identification module (7).
5. The millimeter wave security inspection system for single-point scanning according to claim 1, wherein: and a wave absorbing plate (42) for providing a gray background image for subsequent detection imaging is arranged on one side of the detection area opposite to the three-edge metal reflecting rotating mirror (3).
6. The millimeter wave security inspection system for single-point scanning according to claim 1, wherein: the frequency range of the millimeter wave is as follows: 26.5GHz-1000 GHz.
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