CN103576144A - Short millimeter wave alternating current radiation imaging method and device - Google Patents
Short millimeter wave alternating current radiation imaging method and device Download PDFInfo
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Abstract
The invention discloses a short millimeter wave alternating current radiation imaging method and device. The short millimeter wave alternating current radiation imaging method includes the steps of enabling an antenna to receive information, amplifying the signal radio frequency of the information, conducting signal detection, low-frequency signal amplification and gating, A/D sampling, voltage-gray level imaging, image geometric correction and image energy compensation, displaying a pseudo-color image, and the like. The short millimeter wave alternating current radiation imaging device comprises an antenna module, a radio frequency low-noise amplifier module, a detection module, a gating low-noise amplifier module, an A/D sampling module, a scanning control module, an alternating current imaging module, a geometric correction module, an energy compensation module and an image display module. The short millimeter wave alternating current radiation imaging method and device are simple in structure, low in use cost and good in use effect.
Description
Technical field
The invention belongs to radiometers image-forming field, particularly a kind of short millimeter wave exchanges radiant image method and imaging device.
Background technology
Compare with the imaging detection of existing all kinds of actives and passive system, the main difficulty of millimeter wave, submillimeter wave imaging and passive imaging is just that millimeter wave, the submillimeter wave energy of natural various object institute radiation is too faint, conventionally only have picowatt level even lower, and the noise of natural various interference and receiver self is far away higher than the energy of useful signal.Therefore, how from being flooded by noise, signal, to detect useful information be a very large challenge.Because the natural own radiation of natural object cannot change, therefore basic method is exactly the sensitivity that will make great efforts to improve receiver, for example, signal is carried out preposition low noise amplification, reduces gain fluctuation, reduction system noise of system itself etc. as far as possible as far as possible.
Millimeter wave radiometer output rises and falls by system noise uncertainty and the uncertain decision of system-gain, and general the latter is than the former large two orders of magnitude, thereby the passive of system-gain plays a decisive role.In general, adopt high performance microwave device and increase predetection bandwidth and the sensitivity of radiometer can be brought up to the level that meets various application request.But for the short millimeter-wave radiation of microwave and scattering system, the breakthrough improvement of circuit system type is very difficult.For a long time, people adopt various ways to reduce always and eliminate system-gain and rise and fall and the probabilistic impact of own ship's noise.Mainly take following method:
First, radiation detection application both at home and abroad is the radiometer of direct current system mostly at present, and on the basis of total power microwave radiometer, nineteen forty-six Dicke develops Dicke radiometer.The impact of eliminating the machine gain fluctuation is counted in Dicke radiation, adopts single-pole double-throw (SPDT) microwave switch, makes receiver inlet alternately receive antenna port and reference source port.In the laggard line correlation detection of quadratic detection with subtract each other processing, greatly reduced the impact of gain fluctuation, make microwave radiometer move towards practical.But this method is only when antenna temperature equates with reference source temperature, and ability is the impact of cancellation receiver gain fluctuations all.Other realizes as adopted pulse modulated constant current source switch directly to modulate solid-state noise source the zero balancing working method that impulsive noise is injected, and has developed a kind of pulsed modulation constant current source switch of high stable for this reason; Adopt whole constant temperature structure, guarantee that the environment temperature of radiometer is stablized the constant reference load temperature that only equals.Can eliminate like this measuring error that existence and variation due to front end loss and reflection cause, further improve the absolute precision of system; And because circuitry and device work in isoperibol, can guarantee that system works is stable and reliable for performance.But its hardware system is more complicated also.
There are at present two kinds of modes to detect the signal of antenna reception, be superhet and direct detection formula, superhet is more traditional structure, and its radiofrequency signal may be passed through or without amplification, but all can enter after frequency mixer is down-converted to intermediate-freuqncy signal, be carried out the processing such as amplification demodulator again; And signal direct detection after low noise amplifier that direct-detection receiver receives.Conventionally DC radiometer, for DC noise in counteracting machine, need to adopt enlightening gram comparison expression, cycle calibration formula or inject noise-type to obtain radiometer system, and imaging system need to increase calibration load and cold and hot noise source.And alternative radiometer utilizes AC energy to obtain the information of target, there is own unique calibration mode, unique image is understood and processing mode.
According to pertinent literature both domestic and external report and patent of invention, which kind of receiver no matter, is mainly all to utilize DC energy to obtain the specific information of target at present.And adopt alternative radiometer to can be used as a kind of important form that passive millimeter wave field obtains target information, compare the existing identical target image interpretation method of exchange of information with DC information and there is again own unique image interpretation and interpretation method.
DC radiometer scans still not scan all Voltage-output, can obtain the information of target.Alternative radiometer must just can obtain the contrast information of target by scanning.Adopt after high-velocity scanning alternative radiometer, the DC energy of image is by partial loss, and the sensitivity of imaging will be lower.But little on the relativity impact between target.From the angle of energy, although alternative radiometer has lost a part of DC energy, little on the comparative information impact between target, therefore utilize target that the passive millimeter wave image of alternative radiometer system can reflect and the position relationship between target.Disregarding under the ideal conditions of gain fluctuation in addition, total power radiometer doubles than Dick's formula radiometer sensitivity.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, use cost is low, and the good short millimeter wave of result of use exchanges radiant image method and imaging device.
The technical solution that realizes the object of the invention is:
Millimeter wave exchanges a radiant image method, comprises the following steps:
Step 1: the corresponding wave band natural radiation of the short millimeter wave antenna information of utilizing bigbore short millimeter wave antenna receiving target;
Step 2: utilize short mm wave RF LNA module that the radiofrequency signal of target emanation information is amplified;
Step 3: utilize detection module that radiofrequency signal is converted into low frequency signal;
Step 4: utilize the low amplification module of gating to select the low-frequency ac signal of target;
Step 5: utilize Peak Intensity Method to select suitable plus or minus energy voltage to carry out imaging, utilize Chip Microcomputer A/D sampling module that the analog AC of low frequency is signal digitalized, negative voltage need utilize leads circuitry phase and be converted into positive voltage;
Step 6: after imaging finishes, the voltage after digitizing is converted into 256 grade original-gray image;
Step 7: original-gray image is carried out to the geometric correction of imagery according to scan mode, eliminate Scanning Distortion;
Step 8: the gray level image after proofreading and correct is carried out to energy compensating according to the gray feature of different target;
Step 9: the gray level image after energy compensating is shown as to pseudo color image according to gray scale-False color mapping.
A kind of short millimeter wave exchanges radiation imaging apparatus, comprise Anneta module, radio frequency LNA module, detection module, the low amplification module of gating, A/D sampling module, scan control module, exchange image-forming module, geometry correction module, energy compensating module, image display, wherein Anneta module, radio frequency LNA module, detection module, the low amplification module of gating, A/D sampling module, interchange image-forming module, geometry correction module, energy compensating module, image display connect successively, and scan control module is connected with A/D sampling module with Anneta module respectively; Background information receives through Anneta module, then enters into the radio-frequency information of radio frequency LNA module after LNA is amplified and enters the detection of detection module, then send into the low amplification module of gating, through the low amplification module of gating, obtains low-frequency information; Then through A/D sampling module, enter into interchange image-forming module, after exchanging image-forming module processing, send into geometry correction module, for mechanical scanning with exchange shape distortion and proofread and correct correction, after geometry correction resume module, send into energy compensating module and carry out energy compensating, make up the technological deficiency that can not distinguish general objective, finally send into image display, the scene image that approaches natural feature on a map radiation of demonstration, scan control module wherein, control antenna carries out two-dimensional scan imaging.
The present invention compared with prior art, its remarkable advantage:
(1) disclosed and utilized this new technique measure of knowing natural environment appearance of millimeter wave alternative radiometer detection imaging, be particularly suited for realizing short millimeter band system and realize and survey.
(2) compare with common DC radiometer information, alternative radiometer information has comprised the physical dimension of target equally, the information such as material feature, but the form of expression of image is different with deciphering method existence, utilizes interchange system can obtain Obtaining Accurate target information equally.
(3) AC energy information and DC energy information are not only had any different but also be related, it is all the important way of obtaining target information, the alternative radiometer image with behavioral characteristics has not only been opened up new acquisition of information mode, and image also has own unique interpretation and interpretive mode.
(4) compare with DC radiometer image, the spatial resolution that exchanges radiation image is moderate, can not cause the worry that passenger exposes for privacy, has higher detection destination properties and the ability of profile, has the focal plane system integration and consistance better.
(5) compare with DC radiometer imaging, exchanging imaging radiometer is a kind of total power radiometer of high-velocity scanning.It,, by the low DC component of putting in removing machine of gating, utilizes AC compounent to obtain the information of target.It has avoided the DC noise in machine, has saved matched load and 3mm switch and complicated synchro detection circuit, has more simple circuit structure, has shorter 1-5ms integral time, and lower cost and test macro.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the method flow diagram that the short millimeter wave of the present invention exchanges radiant image method and imaging device.
Fig. 2 is the module connection layout that the short millimeter wave of the present invention exchanges radiant image method and imaging device.
Fig. 3 is the structural representation that the short millimeter wave of the present invention exchanges radiant image method and imaging device.
Fig. 4 is that the 3mm wave band AC and DC radiant image signal of the short millimeter wave interchange radiant image method of the present invention and imaging device compares schematic diagram.
Embodiment
As shown in Figure 1: a kind of short millimeter wave of the present invention exchanges radiant image method, comprises the following steps:
Step 1: utilize the corresponding wave band natural radiation of bigbore short millimeter wave antenna receiving target information, the bore of antenna has directly determined resolution, in the present invention, adopt the cassette antenna of 600mm bore, the cassette antenna of all bores between can compatible 100mm-600mm, according to the frequency range of antenna, as 92-100GHz, can receive the same frequency range information of respective objects; Need to be shorter than 3mm wave band radiating antenna system, the millimeter wave of being longer than 3mm wave band exchanges the more difficult requirement that meets target image resolution and signature analysis in safety inspection and environmental monitoring of imaging system imaging resolution, all there is huge technology barrier in the active radar system or the realization of DC radiometer system that are shorter than at present 3mm wave band, and alternative radiometer system is the most simply, the most easily realizes.
Step 2: utilize short mm wave RF LNA module that the radiofrequency signal of target emanation information is amplified, the working band of radio frequency LNA is 70-110GHz, and gain is greater than 50dB.
Step 3: utilize detection module that radiofrequency signal is converted into low frequency signal, the sensitivity 800W/V of detection module, can meet the requirement of system sensitivity.
Step 4: utilize the low amplification module of gating to select the low-frequency ac signal of target; 1 kilo-ohm of the low output resistance of putting of gating, integrating capacitor is 2 microfarads, and be t=2ms the integral time of system like this, and this is B=250Hz with regard to requiring the low band bandwidth of putting of gating; The effect of the low amplification module of gating is every the DC information component that removes target and noise, retain exchange of information component, must guarantee to match with sweep velocity (equating) integral time of the low amplification module of gating, must utilize selector switch to intercept suitable positive and negative numerical levels and exchange imaging.
Step 5: utilize Peak Intensity Method to select suitable plus or minus energy voltage to carry out imaging, utilize Chip Microcomputer A/D sampling module that the analog AC of low frequency is signal digitalized, digitized voltage value minimum is 0.01mV.
Step 6: after judgement imaging finishes (continuing scanning imagery as do not finished), adopt 256 voltage gradations-gray scale to be converted into original-gray image the information after digitizing; Exchange imaging and compare with common direct current millimeter wave radiometer, exchange similar one irregular how much differential of radiation image, irregular form parameter is determined by system impedance sum-product intergrator.
Step 7: original-gray image is carried out to the geometric correction of imagery according to conical scanning mode, eliminate Scanning Distortion; In addition, exchange the similar irregular derivative characteristic of radiation image the geometric configuration of target is changed, need to carry out according to irregular derivative characteristic parameter the full-size(d) of restore target; Except proofreading and correct common mechanical conical scanning distortion, similar one irregular how much differential of original interchange radiation image, irregular form parameter is determined by system impedance sum-product intergrator, in order to guarantee to select geometric configuration roughly, need to carry out according to parameter the full-size(d) of correction target.
Step 8: the gray level image after proofreading and correct is carried out to energy compensating according to the gray feature of different target; Because interchange radiation image all approaches null value for the sampled voltage of large area target, thus need to redefine according to the peak-to-average of different target the voltage-gray-scale value of target, to distinguish different targets; Adopt interchange radiant image need to carry out energy compensating, than common direct current millimeter wave radiometer, compare, exchange radiation image identical for the test of point target, image for step target is completely different, the DC information of a general objective very galvanic current is flat, different these DC level of target are conventionally different, and the general objective of alternative radiometer is all a noise level that approaches 0 volt, at this moment need to utilize the peak point energy compensating that carries out as a reference point of two ends target to distinguish different large area targets.
Step 9: the gray level image after energy compensating is shown as to pseudo color image according to gray scale-False color mapping.Energy compensating, compares than common direct current millimeter wave radiometer, exchanges radiation image identical for the test of point target, obviously different for the test of step target, at this moment needs to utilize the peak point energy compensating that carries out as a reference point of two ends target.Image shows is the image of alternative radiometer, close to the radiation of target true nature.
As shown in Figure 4:
DC radiometer scans still not scan all Voltage-output, can obtain the information of target, and alternative radiometer must just can obtain the contrast information of target by relative motion.Adopt after alternative radiometer, the DC energy of image is by partial loss, and the sensitivity of imaging will be lower.But little on the relativity impact between target.
Embodiment 1: the Millimeter Wave Radiometric Characteristic test experiments of prohibited items:
Utilize PC and single-chip microcomputer to carry out scan control and imaging, in monolithic processor controlled image scanning process, within an interrupt cycle, utilize 3mm wave band antenna to receive the natural radiation information of human body clothing (and concealing article), through radio frequency LNA module, be amplified into detection module, then by the gate action of the low amplification module of gating, produce a voltage signal, this voltage signal becomes digitized signal after A/D sampling, according to the amplitude of voltage signal, determine corresponding gray shade scale, produce an original image, original image is (as the shape of concealing annulus) after geometry correction, again through DC energy compensation, colors as different in large area in image represent region, finally utilize colouration value method to produce a secondary pseudo color image, can also utilize Matlab system colour to produce the contraband goods simulation safety check image of gray scale-pseudo-colours.
Embodiment 2: the Millimeter Wave Radiometric Characteristic test experiments of scene:
Utilize PC and single-chip microcomputer to carry out scan control and imaging, in monolithic processor controlled image scanning process, within an interrupt cycle, utilize 3mm wave band antenna to receive the natural radiation information of scene (ground object target), through radio frequency LNA module, be amplified into detection module, then by the gate action of the low amplification module of gating, produce a voltage signal, this voltage signal becomes digitized signal after A/D sampling, according to the amplitude of voltage signal, determine corresponding gray shade scale, produce an original image, original image is (as rectangle and circle shape target) after geometry correction, again through DC energy compensation, colors as different in large area in image represent region, finally utilize Matlab system colour to produce the playground image of gray scale-pseudo-colours.
As shown in Figure 2: a kind of short millimeter wave of the present invention exchanges radiation imaging apparatus, comprise Anneta module, radio frequency LNA module, detection module, the low amplification module of gating, A/D sampling module, scan control module, exchange image-forming module, geometry correction module, energy compensating module, image display, Anneta module wherein, radio frequency LNA module, detection module, the low amplification module of gating, A/D sampling module, exchange image-forming module, geometry correction module, energy compensating module, image display connects successively, scan control module is connected with A/D sampling module with Anneta module respectively, background information receives through Anneta module, then enters into the radio-frequency information of radio frequency LNA module after LNA is amplified and enters the detection of detection module, then send into the low amplification module of gating, through the low amplification module of gating, obtains low-frequency information, then through A/D sampling module, enter into interchange image-forming module, after exchanging image-forming module processing, send into geometry correction module, for mechanical scanning with exchange shape distortion and proofread and correct correction, after geometry correction resume module, send into energy compensating module and carry out energy compensating, make up the technological deficiency that can not distinguish general objective, finally send into image display, the scene image that approaches natural feature on a map radiation of demonstration, scan control module wherein, control antenna carries out two-dimensional scan imaging.
As shown in Figure 3: the present invention controls the vertical stepper motor 1 of vertical direction and its counterweight derby 2 is positioned at the left and right sides that horizontally rotates framework 5, on vertical rotary framework 16, place antenna and radiometer 4, the phase line of the signal wire of radiometer 4 and power lead and stepper motor is opened crossed beam trunking 6 through horizontally rotating the inwall of framework 5, feathering axis 7 through hollow enters into reduction chamber again, through spatial clapboard, enter the pulpit of lower one deck, horizontal stepper motor 9 and worm reduction box 8 are wherein housed in reduction chamber, drive unit 10 is housed in pulpit, D.C. regulated power supply 11 and single chip control module 12, power lead is connected to power socket 13, signal wire connects computing machine by signal wire interface 14 and carries out data processing and imaging, whole device is arranged on supporting bracket 15, wherein, in radiometer 4, comprise radio frequency LNA module, detection module, the low amplification module of gating, in single chip control module 12, comprise A/D sampling module, scan control module, in the computing machine that signal wire connects by signal wire interface 14, comprise and exchange image-forming module, geometry correction module, energy compensating module, image display.
Embodiment 3: as shown in Figure 3, millimeter-wave radiation imaging device key dimension and the technical parameter of AC energy system are as follows: height 1.8m, weight is less than 50kg, floor area 0.2m
2; Areas imaging 180oX90 o(wherein horizontally rotates and can expand to according to actual needs 360o), except power socket and SMA signal seat, whole system is without open-wire line, and each several part imaging function module is all positioned at integral structure.System is as follows with syndeton: control the vertical stepper motor 1 of vertical direction and its counterweight derby 2 and be positioned at the left and right sides that horizontally rotates framework 5, on vertical rotary framework 16, place can compatible 600mm within Cassegrain antenna 3 and the radiometer 4 of bore, the phase line of the signal wire of radiometer 4 and power lead and stepper motor is opened crossed beam trunking 6 through horizontally rotating the inwall of framework 5, the feathering axis 7 of process hollow enters into reduction chamber and wherein in reduction chamber, horizontal stepper motor 9 and worm reduction box 8 is housed again, drive unit 10 is housed in pulpit, D.C. regulated power supply 11 and single chip control module 12, power lead is connected to power socket 13, SMA signal wire connects computing machine by signal wire interface 14 and carries out data processing and imaging, whole device is arranged on supporting bracket 15.
Wherein, vertical stepper motor 1 and horizontal stepper motor 9, be the stepper motor that volume is little, lightweight, precision is high, noise is low.Crossed beam trunking 6 in device, make radiometer 4 power leads of needs and the six roots of sensation phase line of signal wire and vertical stepper motor 1 all by the feathering axis 7 of metal framework fluting hiding, that seal and hollow, through the connection panel of reduction chamber and pulpit, carry out Power supply, scan control and data and transmit.This design without open-wire line greatly reduces winding and the electromagnetic screen of scanning system.
Be different from traditional DC radiometer imaging, exchanging imaging radiometer is a kind of total power radiometer of high-velocity scanning.It,, by the low DC component of putting in removing machine of gating, utilizes AC compounent to obtain the information of target.It has avoided the DC noise in machine, save matched load and 3mm switch and complicated synchro detection circuit, there is more simple circuit structure, there is shorter 1-5ms integral time, and lower cost and test macro, be especially easy to realize the millimeter-wave systems that is shorter than 3mm.Can airport, the safety check located such as customs, harbour provides a kind of new technical method.Itself does not launch any electromagnetic wave passive millimeter wave imaging technique, therefore to human body, be safe, because millimeter wave has certain penetrability to clothing, carton, leather etc., therefore available millimeter wave exchanges imaging radiometer and detects the object of concealment under clothing in addition.
The radiometers image-forming method that exchanges system is especially applicable to the application of short millimeter wave band, and this wave band is initiatively current and the development of passive millimeter wave detector exists huge technology barrier.The present invention proposes a kind of imaging processing and deciphering method of short millimeter-wave radiation image, for further expansion exchanges system imaging with large-scale application millimeter wave, provides theoretical premise and technical foundation.
A kind of short millimeter-wave radiation formation method of the present invention, first with radar, infrared and DC radiometer is the same, it is a kind of method of detection of a target characteristic, can utilize the mode of imaging to obtain the information of target, owing to thering is ability to work all-time anf all-weather, be better than infrared and optical detection system, again due to emitting electromagnetic wave not, so there is again higher disguise and security, compare with DC radiometer, have and be simple and easy to integrated structure, lower cost, test macro easily, for short millimeter and submillimeter wave wave band, preferential easy implementation on possessing skills than the radar of identical wave band and radiometer.
Claims (10)
1. short millimeter wave exchanges a radiant image method, it is characterized in that: comprise the following steps:
Step 1: the corresponding wave band natural radiation of the short millimeter wave antenna information of utilizing bigbore short millimeter wave antenna receiving target;
Step 2: utilize short mm wave RF LNA module that the radiofrequency signal of target emanation information is amplified;
Step 3: utilize detection module that radiofrequency signal is converted into low frequency signal;
Step 4: utilize the low amplification module of gating to select the low-frequency ac signal of target;
Step 5: utilize Peak Intensity Method to select suitable plus or minus energy voltage to carry out imaging, utilize Chip Microcomputer A/D sampling module that the analog AC of low frequency is signal digitalized, negative voltage need utilize leads circuitry phase and be converted into positive voltage;
Step 6: after imaging finishes, the voltage after digitizing is converted into 256 grade original-gray image;
Step 7: original-gray image is carried out to the geometric correction of imagery according to scan mode, eliminate Scanning Distortion;
Step 8: the gray level image after proofreading and correct is carried out to energy compensating according to the gray feature of different target;
Step 9: the gray level image after energy compensating is shown as to pseudo color image according to gray scale-False color mapping.
2. a kind of short millimeter wave according to claim 1 exchanges radiant image method, it is characterized in that: the bigbore short millimeter wave antenna described in step 1 refers to that diameter is less than the cassette antenna of all bores of 600mm.
3. a kind of short millimeter wave according to claim 1 exchanges radiant image method, it is characterized in that: the working band of the radio frequency LNA described in step 2 is 70-110GHz, and gain is greater than 50dB.
4. a kind of short millimeter wave according to claim 1 exchanges radiant image method, it is characterized in that: the sensitivity 500 W/V-800W/V of the detection module described in step 3.
5. a kind of short millimeter wave according to claim 1 exchanges radiant image method, it is characterized in that: 1 kilo-ohm of the low output resistance of putting of the gating described in step 4, integrating capacitor is 2 microfarads.
6. a kind of short millimeter wave according to claim 1 exchanges radiant image method, it is characterized in that: the digitized voltage value described in step 5 is accurate to 0.01mV.
7. a kind of short millimeter wave according to claim 1 exchanges radiant image method, it is characterized in that: the scan mode described in step 7 is conical scanning mode.
8. a kind of short millimeter wave according to claim 1 exchanges radiant image method, it is characterized in that: the energy compensating described in step 8 is according to the peak-to-average of different target, to redefine the voltage-gray-scale value of target, to distinguish different targets.
9. one kind short millimeter wave exchanges radiation imaging apparatus, it is characterized in that: comprise Anneta module, radio frequency LNA module, detection module, the low amplification module of gating, A/D sampling module, scan control module, exchange image-forming module, geometry correction module, energy compensating module, image display, Anneta module wherein, radio frequency LNA module, detection module, the low amplification module of gating, A/D sampling module, exchange image-forming module, geometry correction module, energy compensating module, image display connects successively, scan control module is connected with A/D sampling module with Anneta module respectively, background information receives through Anneta module, then enters into the radio-frequency information of radio frequency LNA module after LNA is amplified and enters the detection of detection module, then send into the low amplification module of gating, through the low amplification module of gating, obtains low-frequency information, then through A/D sampling module, enter into interchange image-forming module, after exchanging image-forming module processing, send into geometry correction module, for mechanical scanning with exchange shape distortion and proofread and correct correction, after geometry correction resume module, send into energy compensating module and carry out energy compensating, make up the technological deficiency that can not distinguish general objective, finally send into image display, the scene image that approaches natural feature on a map radiation of demonstration, scan control module wherein, control antenna carries out two-dimensional scan imaging.
10. a kind of short millimeter wave according to claim 9 exchanges radiation imaging apparatus, it is characterized in that: control the vertical stepper motor (1) of vertical direction and its counterweight derby (2) and be positioned at the left and right sides that horizontally rotates framework (5), at upper antenna (3) and the radiometer (4) placed of vertical rotary framework (16), the signal wire of radiometer (4) and the phase line of power lead and stepper motor are opened crossed beam trunking (6) through horizontally rotating the inwall of framework (5), the feathering axis (7) that passes through again hollow enters into reduction chamber, through spatial clapboard, enter the pulpit of lower one deck, horizontal stepper motor (9) and worm reduction box (8) are wherein housed in reduction chamber, drive unit (10) is housed in pulpit, D.C. regulated power supply (11) and single chip control module (12), power lead is connected to power socket (13), signal wire connects computing machine by signal wire interface (14) and carries out data processing and imaging, whole device is arranged on supporting bracket (15), wherein, in radiometer (4), comprise radio frequency LNA module, detection module, the low amplification module of gating, in single chip control module (12), comprise A/D sampling module, scan control module, in the computing machine that signal wire connects by signal wire interface (14), comprise and exchange image-forming module, geometry correction module, energy compensating module, image display.
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| CN109490879A (en) * | 2017-09-13 | 2019-03-19 | 中兴通讯股份有限公司 | A kind of method and device for preventing millimeter wave from modeling imaging |
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| CN109490879A (en) * | 2017-09-13 | 2019-03-19 | 中兴通讯股份有限公司 | A kind of method and device for preventing millimeter wave from modeling imaging |
| CN109490879B (en) * | 2017-09-13 | 2023-07-04 | 中兴通讯股份有限公司 | Method and device for preventing millimeter wave modeling imaging |
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