CN205176270U - Holographic safety inspection appearance system of active microwave - Google Patents
Holographic safety inspection appearance system of active microwave Download PDFInfo
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- CN205176270U CN205176270U CN201520938806.5U CN201520938806U CN205176270U CN 205176270 U CN205176270 U CN 205176270U CN 201520938806 U CN201520938806 U CN 201520938806U CN 205176270 U CN205176270 U CN 205176270U
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Abstract
The utility model discloses a holographic safety inspection appearance system of active microwave, including emit antenna subassembly, frequently comprehensive subassembly, receipt front end, gate control board, processing subassembly, calbiration system, power supply module and servo. The utility model discloses compare with traditional security installations, the personnel that are examined need not to stagnate, and safety inspection efficiency very improves, detect disguised highly, possesses long -range on duty characteristic. Can be on -vehicle, so overall structure adopts the collapsible form of antenna array, consider the practical application occasion, can realize the rotation of pitch axis and azimuth axis. To compare the mode of deploying to ensure effective monitoring and control of illegal activities more nimble with traditional security installations, effectively early warning incident cruelly probably. Adopt frequency modulation continuous wave system, greatly reduced transmit power to equipment cost has been reduced.
Description
Technical field
The utility model belongs to technical field of imaging, particularly one active microwave holography safety check instrument system.
Background technology
Current imaging technique mainly contains optical imagery, infrared imaging, microwave imaging etc.Optical imagery, infrared imaging penetrability are poor, mainly to the surface characteristics imaging of object.Microwave imaging is just different, and it has penetrability, can penetrate the clothing that human body is dressed.Microwave imaging also has a lot of mode, comprises SAR, ISAR etc., and the image-forming range of current carried SAR can reach about 150km, and resolution can reach about 0.15m, but real-time is poor, can not to dead ahead imaging.
There is a kind of radar imaging technology of New System in recent years, be called MIMO (Multipleinputmultipleoutput) radar imaging technology.This technology has the advantages that beam transmitting multi-beam receives, with multiple submatrixes phased-array radar, Digital Array Radar resemblance; But the radar of this system has its distinctive feature, it adopts simultaneously, and multi signal is launched, multi signal receives, can be time domain between multi signal, spatial domain or polarizing field be separated, have that process dimension is higher, transmitting-receiving aperture utilizes more fully, resolution is high, can imaging, real-time advantage.
Domestic a lot of colleges and universities also start the theoretical research carrying out MIMO radar, and the research of radar also mainly concentrates on Design of Signal, detection, parameter estimation, Wave beam forming, DOA estimate first-class theoretical side.Actual radar system is domestic at present also not to be reported.
For this reason, urgently occur a kind of can either for current domestic security protection in the urgent need to, mainly carry out closely the research of (1m ~ 25m) imaging technique, emphasis identifies " cruelly probably the molecule " with it with dangerous material such as explosive, gun, detonator, cutters.The New Type Radar equipment that the more place of the flow of personnel such as subway, airport ENTRANCE or significant points carry out security protection inspection can be applied to.
Utility model content
For the problems referred to above, the utility model provides a kind of active microwave holography safety check instrument system.
The technical solution of the utility model is as follows:
A kind of active microwave holography safety check instrument system, comprises emitting antenna assembly, frequently combines assembly, receiving front-end, gating control panel, processing components, calibration system, power supply module and servo-drive system; Emitting antenna assembly connects combines assembly frequently; Frequently combine assembly and connect emitting antenna assembly, receiving front-end, processing components and Energy control bus; Receiving front-end connects combines assembly and gating control panel frequently; Gating control panel connects receiving front-end and processing components; Processing components connects gating control panel, frequently combines assembly, servo-drive system and Energy control bus; Calibration system connects Energy control bus; Power supply module connects generator and servo-drive system; Servo-drive system connects power supply module, processing components and Energy control bus.
Advantageous Effects of the present utility model is:
The utility model introduces a series of advanced technology, can reach following effect and advantage compared with traditional rays safety detection apparatus:
1, remote weighing feature.The targets such as the domestic microwave radar systems of employing first perception human body, gun, daggers and swords, explosive, liquid dangerous material, compared with traditional rays safety detection apparatus, tested personnel are without the need to stagnating, and safety check efficiency greatly improves; Detect disguised high; Possesses remote weighing characteristic.
2, flow safety patrol inspection feature.The design of safety check instrument can be vehicle-mounted, so one-piece construction adopts antenna array foldable form, consider practical application, safety check instrument can realize the rotation of pitch axis and azimuth axis.Mode of deploying to ensure effective monitoring and control of illegal activities compared with traditional rays safety detection apparatus is more flexible, effectively early warning cruelly can fear event.
3, radar cost is greatly reduced.Compared with foreign same type radar, active microwave holography safety check instrument system adopts Continuous Wave with frequency modulation system, greatly reduces emissive power, thus reduces equipment cost.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the utility model complete machine.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
As shown in Figure 1, active microwave holography safety check instrument system of the present utility model is primarily of emitting antenna assembly, frequently comprehensive assembly, receiving front-end, gating control panel, processing components, calibration system, power supply module and servo-drive system composition.
A) emitting antenna assembly
Adopt hoghorn, by circumference waveguide transitions.Emitting antenna is placed on receiving antenna surrounding each one and middle one of receiving antenna array.Local directed complete set can be carried out according to design in position.Realize effectively covering place periphery.
Receiving antenna array is the one dimension antenna array be made up of 32 electromagnetic horns, and in machine system, it is along orientation to arrangement.Complete machine needs 32 receiving antenna arrays altogether.Pyramidal horn antenna selected by receiving antenna.
B) frequently assembly is combined
By transmitting baseband signal by up-conversion link and frequency multiplication link, be modulated to the linear frequency modulation continuous wave signal of K ripple; Produce AD sampling clock and DDS sampling clock; Produce 32 tunnel transmitted reference signal; By switching over, realize five tunnels and to transmit timesharing radiation.
C) receiving front-end
High carrier frequency echoed signal and transmitted reference signal are carried out mixing and obtains difference frequency signal; Echoed signal is received by 1/32 switch timesharing; 32 tunnel transmitted reference signal are realized by 32 tunnel merit subdivisions.
D) gating control panel
Array row gating, gating one road difference frequency signal, send process; For receiving front-end provides power supply; 422 orders of processing components being sent are converted to discrete magnitude signal, control lines row gating switch.
E) processing components
The conditioning of difference frequency signal is completed by signal conditioning circuit (bandpass filtering, amplification etc.); By A/D chip, the difference frequency signal after conditioning is sampled, be converted into digital signal.
F) servo-drive system
Dual-mode antenna is driven to rise perpendicular and pack up; Drive scanner can select scanning center between 0 ° ~ ﹢ 360 °; Drive scanner carries out the fan sweeping in certain level angular range; Scanner is driven to carry out adjusting within the scope of certain luffing angle; Self-checking function, reports BIT result by RS422.
G) calibration system
During the aerial array of radiofrequency signal before entering microwave link, because of antenna this in azimuth pitch angular deviation, the various impact such as amplitude-frequency response is uneven, global consistency is inadequate, the signal being sent to microwave link can be caused to produce amplitude-frequency, the distortion of space wave number; And radiofrequency signal enters the impact that microwave link also can be subject to a series of microwave device later, comprise the amplitude-frequency response of device, the loss, electromagnetic interference (EMI), temperature etc. of connecting line all can the inband flatness of signal have an impact, and cause I/Q paths signal to produce imbalance etc. in amplitude and phase place.The echo signal that these impacts can make safety check instrument each receiving cable echoed signal superpose out produces various distortion in frequency domain, spatial domain, thus has a strong impact on image quality.
Only rely on antenna and microwave link design very difficult guarantee image quality itself, for this reason, this programme compensates antenna by the method for calibrating in the digital domain and the next various harmful effects of wavestrip are regained in microwave link docking, thus guarantee image quality.
H) power supply module
AC220V is converted to+24V and is supplied to servo-drive system.
The thinking that the utility model solves microwave holography safety check instrument system demand is: MIMO radar adopts many array-element antenna structure, and M sends out N and receives, and launch mutually orthogonal signal, these many waveform signals are received by N number of reception array element via target scattering simultaneously.Due to orthogonality relation, multiple transmitting can keep respective independence in space, just can there is MN passage in space to reception battle array like this from transmitting battle array simultaneously, corresponding one of each passage specifically launches array element to target, target to the combination of paths of specific reception array element, and the time delay of passage is relevant with the position of receiving and dispatching array element with target.Each reception array element of receiving end uses M matched filter to mate M transmitted waveform respectively, can obtain MN passage echo data by orthogonality sorting.Adopt ping-pong type stream treatment pattern, when safety check instrument works in the first frame, treatment channel 1 is only responsible for storing pretreated echo data; When safety check instrument works in the second frame, treatment channel 1 starts to process the echo data of the first frame, imaging uploading, and treatment channel 2 is responsible for storing pretreated echo data; When safety check instrument works in the 3rd frame, treatment channel 2 starts to process the echo data of the first frame, imaging uploading, and treatment channel 1 is responsible for storing pretreated echo data; Move in circles thus.
Working frequency range: choose K-band;
Working system: adopt LFMCW system;
To structure the formation principle: according to microwave holography imaging theory, complete and realize holographic imaging, structure the formation must meet nyquist sampling theorem at the receiving antenna of spatial domain, interval of namely structuring the formation must be less than half-wavelength.For millimeter wave electromagnetic horn, this spacing of structuring the formation not only can cause cost high, and due to loudspeaker own dimensions, makes to structure the formation and cannot carry out at all.
Therefore, adopt thinned arrays, namely adopt the sampling interval lower than nyquist sampling theorem to carry out spatial domain sampling.Then in end for process, by signal reconstruction means such as compressed sensing, by signal reconstruction out.
The key technical indexes that the utility model can reach is as follows:
Radar system: the continuous system of frequency modulation;
Working frequency range: K-band;
Operating distance: 0.5 ~ 25m;
Cover lateral separation: 3m;
Resolution: 3cm ~ 5cm;
Azimuth scan: 360 ° of rings are swept (can fan sweeping);
Fixing by gross bearings precision: 0.1 °;
Pitching positioning precision: 0.1 °;
Human body radiation: meet one-level place of safety standard-required;
Export: video image, appreciation information etc.;
Image recording time: >=20 days;
Production domesticization: >=85%.
Above-described is only preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive or associate under the prerequisite not departing from spirit of the present utility model and design, all should think and be included within protection domain of the present utility model.
Claims (1)
1. an active microwave holography safety check instrument system, is characterized in that: comprise emitting antenna assembly, frequently combine assembly, receiving front-end, gating control panel, processing components, calibration system, power supply module and servo-drive system; Emitting antenna assembly connects combines assembly frequently; Frequently combine assembly and connect emitting antenna assembly, receiving front-end, processing components and Energy control bus; Receiving front-end connects combines assembly and gating control panel frequently; Gating control panel connects receiving front-end and processing components; Processing components connects gating control panel, frequently combines assembly, servo-drive system and Energy control bus; Calibration system connects Energy control bus; Power supply module connects generator and servo-drive system; Servo-drive system connects power supply module, processing components and Energy control bus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520938806.5U CN205176270U (en) | 2015-11-23 | 2015-11-23 | Holographic safety inspection appearance system of active microwave |
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| CN201520938806.5U CN205176270U (en) | 2015-11-23 | 2015-11-23 | Holographic safety inspection appearance system of active microwave |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613525A (en) * | 2018-10-16 | 2019-04-12 | 上海无线电设备研究所 | The quick full airspace alarm method and system of the one-dimensional MIMO radar of one-dimensional rotation |
| CN109633630A (en) * | 2018-10-31 | 2019-04-16 | 上海无线电设备研究所 | A kind of E wave band millimeter wave imaging safety check radar system |
| CN109856632A (en) * | 2018-11-16 | 2019-06-07 | 上海无线电设备研究所 | A kind of data collection system and its acquisition method of active MMW imaging radar |
-
2015
- 2015-11-23 CN CN201520938806.5U patent/CN205176270U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613525A (en) * | 2018-10-16 | 2019-04-12 | 上海无线电设备研究所 | The quick full airspace alarm method and system of the one-dimensional MIMO radar of one-dimensional rotation |
| CN109633630A (en) * | 2018-10-31 | 2019-04-16 | 上海无线电设备研究所 | A kind of E wave band millimeter wave imaging safety check radar system |
| CN109856632A (en) * | 2018-11-16 | 2019-06-07 | 上海无线电设备研究所 | A kind of data collection system and its acquisition method of active MMW imaging radar |
| CN109856632B (en) * | 2018-11-16 | 2021-06-04 | 上海无线电设备研究所 | Data acquisition system and method of active millimeter wave imaging radar |
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