CN102662170A - Millimeter wave holographic imaging round surface dislocation line array - Google Patents
Millimeter wave holographic imaging round surface dislocation line array Download PDFInfo
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- CN102662170A CN102662170A CN2012101283422A CN201210128342A CN102662170A CN 102662170 A CN102662170 A CN 102662170A CN 2012101283422 A CN2012101283422 A CN 2012101283422A CN 201210128342 A CN201210128342 A CN 201210128342A CN 102662170 A CN102662170 A CN 102662170A
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Abstract
The invention provides a millimeter wave holographic imaging round surface dislocation line array. The technical scheme is as follows: the array elements of the line array are arranged on a plurality of concentric circumferences; and the array elements on the adjacent circumferences are scattered in staggered angles. As a further improvement of the invention, the circumferences are distributed with equal spacing, and one array element is arranged on each circumference. As another improvement of the invention, a plurality of array elements are arranged on each circumference, and the array elements on the same circumference are distributed with equal spacing. According to the invention, the millimeter wave holographic imaging round surface dislocation line array can realize high-density array element deployment, has the advantages of high and uniform scanning speed, small occupied space and relatively larger effective scanning area, and has high resolution.
Description
Technical field
The invention belongs to the radar imagery technical field, relate to the disc dislocation linear array of rotation sweep, relate more particularly to be used for the rotation sweep disc dislocation linear array of active MMW holographic imaging systems.
Background technology
For satisfying Nyquist spatial sampling criterion, the active MMW holographic imaging systems needs intensive spatial sampling, and spatial sampling need be satisfied Δ x＜λ/k at interval, promptly
Wherein λ and f are respectively wavelength and frequency, and then the SI is depended on minimal wave length or lower frequency limit, ε if adopt broadband system
rBe the relative dielectric constant of probing medium, C is the vacuum velocity of wave, and k is a fixed coefficient, and this coefficient and aperture size, target size and target range all have relation, and real system is taken as 2～4 constant usually.Have only the image data of sufficient density could pass through imaging processing acquisition high-definition picture.The implementation of dense space sampling generally has three kinds: the one, and the antenna array that sufficient density array element constitutes; The 2nd, the motion scan of sufficient density; The 3rd, the above two combination.
Receive the size of the parts such as bay, electronic switch and transmission circuit of active MMW, and array element and millimetre-wave circuit need the restriction of factors such as closely linking to each other, be difficult to realize highdensity a burst of unit layout.If can not satisfy the requirement of Nyquist spatial sampling criterion, the data of then gathering will inevitably be lost the high frequency change information that the orientation makes progress to array element at interval, and the loss of spatial frequency information can cause the imaging results quality to descend, and reduces like image blur and resolution.In addition, the array number of face battle array is many, realizes that cost is high.Therefore, first kind of scheme be difficult to realize, even realize that also being is cost with performances such as loss resolution.Patent U.S.Patent5073782 provides a kind of millimeter corrugated battle array, utilized the focus prism of similar optics, but face battle array aperture is little, and resolution is low relatively.
The second way is the motion scan of antenna, as long as the mobile device location is enough accurate, realizes highdensity spatial sampling easily.This mode only needs a pair of reception and emitting antenna to get final product, and cost is low, but it is longer to carry out the motion scan required time of two dimensional surface, so sweep velocity is relatively slow.
Sweep velocity is relative contradiction with the realization cost, and the third mode then is both compromises, and the general using linear array is carried out motion scan, and this mode only needs the motion scan of one dimension, compares the second way, and sweep velocity improves a lot.In addition, linear array is compared with the face battle array, and array number is few, and cost is low, realizes high-density arrangement easily, moves the high-density sampling that can realize two dimensional surface through linear array.The millimeter-wave planar imaging system that patent U.S.Patent5455590 provides has adopted the third mode; Constitute linear array with two row's transmitting-receiving array elements; The linear array horizontal arrangement; Switch the sampling that different array element realizes horizontal direction through electronic switch, the vertical moving scanning of linear array realizes the sampling of vertical direction.Moving vertically in short distance of linear array will start and stop repeatedly, and translational speed is lower, and need acceleration be provided than high-power driving, and sweep velocity is also inhomogeneous, and the antenna vibrations are big.In addition, this two rows' horizontal linear array method for arranging is difficult for realizing high density array element layout, need account for than large space, and this causes equipment volume big, and the effective scanning space is relatively little.
Summary of the invention
Technical matters to be solved by this invention is the deficiency to prior art; Provide and to realize high resolving power active MMW holographic imaging disc dislocation linear array; This linear array can realize high density array element layout; Have the sweep velocity height, sweep velocity is even, takes up space little and the big relatively advantage of effective scanning area.
Technical scheme of the present invention is an a kind of millimeter wave holographic imaging disc dislocation linear array, it is characterized in that array element is arranged on several concentric circumference, and the array element of the adjacent circumferential angle dispersed placement that staggers.
As further improvement of the present invention, above-mentioned several circumference equidistantly distribute.
As further improvement of the present invention, be furnished with an array element on each circumference.
As another improvement of the present invention, be furnished with several array element on each circumference, the array element on the same circumference is by equidistantly arranging.
The invention has the beneficial effects as follows:
(1) each array element is arranged in the arbitrary place on the concentric circumference of different radii; Adjacent array element can be staggeredly arranged by enough big angle; Realize that easily adjacent array element has enough big spacing, and the semidiameter of adjacent array element place circumference can be very little, generally can be less than the array element size.
(2) array element staggers the angle dispersed placement on disc; This angle that staggers arranges that the method for array element not only is easy to satisfy the requirement of array element distance less than the array element size; And be convenient to the processing and the installation of millimetre-wave circuit; The processing and fabricating that comprises electronic switch, reception and radiating circuit structure can largely reduce the difficulty and the cost of processing and fabricating.
(3) when use was of the present invention, each array element was to make the circumference rotation sweep by radii fixus, can realize the intensive mobile sampling of corresponding circumference.Different array elements can be carried out switched scan through electronic switch, realize disc intensive sampling radially.Can realize the intensive sampling of disc by the circumference motion scan of different radii and electronic switch switched scan radially.
(4) when use is of the present invention, scan array element with rotation mode, whole array element all is in the scanning space scope, therefore has the big advantage of effective scanning area.Adopt rotation sweep to realize at the uniform velocity rotation easily, this array element move mode is not because have frequent acceleration and deceleration, and the array element vibrations are little, and realize higher rotational speed easily, can largely improve sweep velocity.In addition, except that the starting and ending stage need be quickened and slow down, the sweep phase array element in the centre all was at the uniform velocity to rotate, and therefore, required drive motor power is less, and this not only helps reducing equipment volume, and helps reducing equipment power dissipation.
Description of drawings
Fig. 1 is that the disc dislocation linear array in a kind of embodiment of the present invention is arranged synoptic diagram;
Fig. 2 is the element position figure in the present invention's embodiment shown in Figure 1;
Fig. 3 is a burst of first location drawing of the equivalent line in the present invention's embodiment shown in Figure 1;
Fig. 4 is that the disc dislocation linear array in the another kind of embodiment of the present invention is arranged synoptic diagram;
Fig. 5 is the element position figure in the present invention's embodiment shown in Figure 4;
Fig. 6 is a burst of first position view of the equivalent line in the present invention's embodiment shown in Figure 4.
Embodiment
Below in conjunction with the embodiment accompanying drawing, the present invention is made further detailed description.
Fig. 1 is that the disc dislocation linear array in a kind of embodiment of the present invention is arranged synoptic diagram.The technical indicator that requires in the embodiment to realize is: center of antenna frequency 50GHz, the wavelength of centre frequency are 6 millimeters, and reception and emitting antenna are arranged together, and a pair of dual-mode antenna is of a size of 12 millimeters of length, 6 millimeter 2 of width; Carry out image scanning, require array element distance to reach 1/2nd wavelength, promptly 3 millimeters.By general equidistant linear array arrangement, can't arrange highdensity array element like this.
The disc dislocation linear array of the specific embodiment of the invention preferably resolves this problem; Take antenna rotation disc scan mode, in 120 millimeters sweep radius, by 3 millimeters 40 concentric circless spaced apart; Dotted line these concentric circless that drawn among the figure; Rectangle frame is represented an array element (comprising a pair of dual-mode antenna) among the figure, arranges an array element on each circumference, and the array element on the neighboring concentric circle staggers by 144 ° fixed angle; Then easily in a radius is 120 millimeters disc cloth deposit 40 pairs of transmitting-receiving array elements, and enough intervals are arranged between array element.When antenna array rotates, rotate a circle and to accomplish 45239 millimeters
2Disc scanning.The disc dislocation linear array of this embodiment can realize rotation sweep fast, and can realize 3 millimeters concentrically ringed high density spatial samplings in interval.
Fig. 2 is the element position figure in the present invention's embodiment shown in Figure 1.The figure orbicular spot shows the center of 40 array elements (comprising a pair of dual-mode antenna) of this disc dislocation linear array; These 40 array elements are distributed on the concentric circles of 40 equidistant radiuses; Dotted line these concentric circless that drawn among the figure, the array element on the adjacent circle is in staggered distribution by 144 ° fixed angle.
Fig. 3 is a burst of first location drawing of the equivalent line in the present invention's embodiment shown in Figure 1.When using disc shown in Figure 1 dislocation linear array, rotate a circle and can accomplish a disc scanning, scanning effect and one 40 pairs uniformly-spaced linear arrays of receiving and dispatching array elements, it is identical to be with an end that the center of circle is rotated the effect of scanning.Therefore, the antenna array of Fig. 1 embodiment is equivalent to 3 millimeters array element high density linear array at interval, has shown the center of 40 array elements that should the equivalence linear array among the figure, and its array element has reached 3 millimeters at interval.In existing actual linear array, can't plant the array element of density like this, and in the linear array of embodiment shown in Figure 1, through being dislocatedly distributed of space, and the equivalent spatial sampling of the rotation sweep when using, equivalence has realized this highdensity linear array.
Fig. 4 is that the disc dislocation linear array in the another kind of embodiment of the present invention is arranged synoptic diagram.The technical indicator that requires in the embodiment to realize is: center of antenna frequency 50GHz, the wavelength of centre frequency are 6 millimeters, and reception and emitting antenna are arranged together, and a pair of dual-mode antenna is of a size of 12 millimeters 6 millimeters of (length) * (wide).Carry out image scanning, require array element distance to reach 1/2nd wavelength, promptly 3 millimeters.The disc dislocation linear array of this embodiment is in 120 millimeters sweep radius, and by 3 millimeters 40 concentric circless spaced apart, dotted line is represented these concentric circless among the figure, and rectangle frame is represented an array element (comprising a pair of dual-mode antenna) among the figure.The radius that removes four minimum circumference is very little, only arranges outside the array element, arranges two array elements (comprising a pair of dual-mode antenna) on other each circumference, and its spatial sampling density can satisfy the scanning requirement.Array element on the neighboring concentric circle staggers by 144 ° fixed angle, in disc, has arranged 76 array elements altogether, and enough intervals are arranged between array element.When antenna array rotated, the rotation half cycle promptly can be accomplished 45239 millimeters
2Disc scanning, therefore, the antenna array of embodiment can be realized 3 millimeters concentrically ringed high density spatials samplings in interval, sampling density is identical with Fig. 1 mode, but rotation sweep speed can double.
Fig. 5 is the element position figure in the present invention's embodiment shown in Figure 4.The figure orbicular spot shows the center of 76 array elements of this disc dislocation linear array; These 76 array elements are distributed on the concentric circles of 40 equidistant radiuses; Dotted line these concentric circless that drawn among the figure, in 4 circles, every circle is arranged an array element; The then every circle of other concentric circles is furnished with two array elements, and the array element on the adjacent circle is in staggered distribution by 144 ° fixed angle.
Fig. 6 is a burst of first location drawing of the equivalent line in the present invention's embodiment shown in Figure 4.When using disc shown in Figure 4 dislocation linear array, the rotation half cycle can be accomplished a disc scanning, the uniformly-spaced linear array of scanning effect and 76 array elements, and it is identical to be with the linear array center that the center of circle is rotated the effect of scanning.Therefore, the disc of Fig. 4 embodiment dislocation linear array is equivalent to 3 millimeters array element high density linear array at interval, has shown the center of 76 array elements that should the equivalence linear array among the figure, and its array element has reached 3 millimeters at interval.In by known linear array, can't plant the array element of density like this, in disc shown in Figure 4 dislocation linear array, through being dislocatedly distributed of space, and the equivalent spatial sampling of the rotation sweep when using, equivalence has realized highdensity linear array.
Claims (4)
1. millimeter wave holographic imaging disc dislocation linear array is characterized in that array element is arranged on several concentric circumference, and the array element of the adjacent circumferential angle dispersed placement that staggers.
2. millimeter wave holographic imaging disc dislocation linear array according to claim 1 is characterized in that said several circumference equidistantly distribute.
3. millimeter wave holographic imaging disc dislocation linear array according to claim 1 and 2 is characterized in that, is furnished with an array element on each circumference.
4. millimeter wave holographic imaging disc dislocation linear array according to claim 1 and 2 is characterized in that be furnished with several array element on each circumference, the array element on the same circumference is by equidistantly arranging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210128342.2A CN102662170B (en) | 2012-04-27 | 2012-04-27 | Millimeter wave holographic imaging round surface dislocation line array |
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| CN201210128342.2A CN102662170B (en) | 2012-04-27 | 2012-04-27 | Millimeter wave holographic imaging round surface dislocation line array |
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| CN102662170A true CN102662170A (en) | 2012-09-12 |
| CN102662170B CN102662170B (en) | 2014-02-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094048A (en) * | 2016-07-26 | 2016-11-09 | 华讯方舟科技有限公司 | Portable security inspection equipment based on mm-wave imaging |
| CN108444601A (en) * | 2018-03-20 | 2018-08-24 | 哈尔滨工业大学 | A kind of small snap shot imaging spectrometer and its imaging method |
| CN110515101A (en) * | 2019-06-21 | 2019-11-29 | 成都天锐星通科技有限公司 | A kind of satellite quick capturing method and phased array antenna system |
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| CN1169540A (en) * | 1996-05-17 | 1998-01-07 | 波音公司 | Circularly symmetric, zero redundancy, planar array having broad frequency range applications |
| JPH10256828A (en) * | 1997-03-12 | 1998-09-25 | Mitsubishi Electric Corp | Monopulse antenna device |
| JP2001177339A (en) * | 1999-12-20 | 2001-06-29 | Mitsubishi Electric Corp | Array antenna system |
| JP2003037429A (en) * | 2001-07-25 | 2003-02-07 | Furuno Electric Co Ltd | Helical antenna and helical antenna array |
| US6768475B2 (en) * | 2001-02-27 | 2004-07-27 | Mitsubishi Denki Kabushiki Kaisha | Antenna |
-
2012
- 2012-04-27 CN CN201210128342.2A patent/CN102662170B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1169540A (en) * | 1996-05-17 | 1998-01-07 | 波音公司 | Circularly symmetric, zero redundancy, planar array having broad frequency range applications |
| JPH10256828A (en) * | 1997-03-12 | 1998-09-25 | Mitsubishi Electric Corp | Monopulse antenna device |
| JP2001177339A (en) * | 1999-12-20 | 2001-06-29 | Mitsubishi Electric Corp | Array antenna system |
| US6768475B2 (en) * | 2001-02-27 | 2004-07-27 | Mitsubishi Denki Kabushiki Kaisha | Antenna |
| JP2003037429A (en) * | 2001-07-25 | 2003-02-07 | Furuno Electric Co Ltd | Helical antenna and helical antenna array |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094048A (en) * | 2016-07-26 | 2016-11-09 | 华讯方舟科技有限公司 | Portable security inspection equipment based on mm-wave imaging |
| CN108444601A (en) * | 2018-03-20 | 2018-08-24 | 哈尔滨工业大学 | A kind of small snap shot imaging spectrometer and its imaging method |
| CN110515101A (en) * | 2019-06-21 | 2019-11-29 | 成都天锐星通科技有限公司 | A kind of satellite quick capturing method and phased array antenna system |
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| CN102662170B (en) | 2014-02-19 |
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