CN215575630U - Compact range device of ultra-large quiet area with high aperture utilization rate - Google Patents
Compact range device of ultra-large quiet area with high aperture utilization rate Download PDFInfo
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- CN215575630U CN215575630U CN202121277493.5U CN202121277493U CN215575630U CN 215575630 U CN215575630 U CN 215575630U CN 202121277493 U CN202121277493 U CN 202121277493U CN 215575630 U CN215575630 U CN 215575630U
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Abstract
The utility model discloses a compact range device of an ultra-large quiet area with high caliber utilization rate, which comprises a compact range reflecting surface, a feed source and a plane wave quiet area, wherein the compact range reflecting surface is provided with a plurality of reflecting surfaces; the feed source is an electromagnetic wave radiation source of a compact range device; adopting diagonal feed layout, wherein the vertex of the compact field reflecting surface is at the position close to the diagonal of the caliber, and the feed source phase center and the reflecting surface focal point are positioned on the virtual rotation symmetry axis of the reflecting surface; the compact range reflecting surface is of a quadric surface structure, and the central entity is a revolution paraboloid part and is used for correcting spherical waves radiated by the feed source into plane waves in a quiet zone; the plane wave dead zone is a limited three-dimensional space area which meets the requirements of far field test after electromagnetic waves radiated by the feed source are corrected by the reflecting surface.
Description
Technical Field
The utility model relates to the field of radar stealth measurement, in particular to a compact range device of an ultra-large quiet area with high aperture utilization rate.
Background
With the demands of full-scale tests of ultra-large-scale aviation, aerospace and electronic equipment, such as solid-mounted airplanes and large ship-borne phased array radars, the demands of precise measurement of full-scale radar target scattering and large-caliber antennas are increasingly urgent. The utilization rate of a dead zone of a traditional single-reflecting-surface compact range is about 40-50%, the utilization rate is low, and the scale of a reflecting surface needs to be increased if the test of large-scale electronic equipment is realized, so that the research risk, the research difficulty and the manufacturing cost of the reflecting surface are increased. Moreover, the dead zone of the ultra-large compact range presents a flattened rectangular characteristic, and is difficult to ensure low-frequency performance (the caliber is less than 30 times of the electrical size) in the aspect of width and height imbalance, particularly in the short side direction of a reflecting surface. Therefore, the conventional compact range solution at present is not beneficial to the engineering realization of the ultra-large compact range oriented to the ultra-large electronic equipment test, and the requirement of excellent performance of both low-frequency and high-frequency quiet zones is met, such as the big-ear radio telescope which is located at Ohio State university in the United states and has the compact range function.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: a compact field device of an ultra-large quiet area with high aperture utilization rate is provided, and the technology of diagonal feed layout, a sawtooth structure and small-amount control of virtual vertex deviation is adopted, so that the irradiation uniformity of a reflecting surface by a feed beam is increased, the influence of edge diffraction on the quiet area is controlled, the bending amount and the offset feed amount of a curved surface of a reflector are reduced, and the compact test field of the ultra-large quiet area with controlled cost, easy realization, high aperture utilization rate and low cross polarization is realized.
The utility model adopts the following technical scheme in order to achieve the aim of the utility model:
a compact range device of a high-caliber utilization rate ultra-large quiet zone comprises a compact range reflecting surface, a feed source and a plane wave quiet zone; the feed source is an electromagnetic wave radiation source of a compact range device; adopting diagonal feed layout, wherein the vertex of the compact field reflecting surface is at the position close to the diagonal of the caliber, and the feed source phase center and the reflecting surface focal point are positioned on the virtual rotation symmetry axis of the reflecting surface;
the compact range reflecting surface is of a quadric surface structure, and the central entity is a revolution paraboloid part and is used for correcting spherical waves radiated by the feed source into plane waves in a quiet zone;
the plane wave dead zone is a limited three-dimensional space area which meets the requirements of far field test after electromagnetic waves radiated by the feed source are corrected by the reflecting surface.
Furthermore, the compact range device of the ultra-large quiet zone with the high caliber utilization rate has the advantages that under the constraint of the same focal length, the three-dimensional field angle of the reflecting surface to the feed source is reduced, so that the radiation of the beam of the feed source to the reflecting surface is more uniform, and the reduction of the amplitude taper of the quiet zone is facilitated.
Further, the compact field reflecting surface is a rectangular structure with inconsistent width and height imbalance, wherein the caliber size difference in the horizontal direction and the vertical direction exceeds 30% of the short side, and the caliber size difference in the horizontal direction and the vertical direction exceeds 30% of the short side.
Furthermore, the virtual vertex of the compact field reflecting surface can perform a preset small amount of deviation on the premise of not increasing the direct echo of the reflecting surface and the beam of the dead zone shielded by the feed source, wherein the preset small amount means that the deviation amount is less than 10% of the size of the reflecting surface, so that the requirement on the rigidity of a reflecting surface back frame is favorably reduced, the cross polarization caused by the deviation amount is reduced, and the erection height of a measured target is reduced.
Furthermore, the edge of the ultra-large quiet area compact range device with the high aperture utilization rate adopts the optimized sawtooth edge to control the influence of edge diffraction on the quiet area, so that the aperture utilization rate is further improved, and the quiet area performance close to the low frequency lower limit is ensured.
Furthermore, the aperture utilization rate of the compact range is more than 60%, and the size of the width edge of the ultra-large quiet zone is more than 20 m.
The technical principle of the utility model is as follows:
the utility model relates to a compact range device of a high-caliber utilization rate ultra-large quiet zone, which mainly comprises a compact range reflecting surface, a feed source and a plane wave quiet zone. The compact field reflecting surface is a rectangular cross section structure with obvious horizontal and vertical difference, the diagonal feed layout is adopted, the three-dimensional field angle of the reflecting surface to the feed source is reduced under the constraint of the same focal length, the irradiation uniformity of the feed source wave beam to the reflecting surface is increased, and the amplitude taper of a dead zone is reduced.
The width and height unbalance of a low-frequency quiet zone introduced by the contraction field caliber rectangle flattening is compensated by a forward-moving quiet zone after short-focus design and edge optimization.
The small deviation of the virtual vertex of the compact field reflecting surface can reduce the bending amount of the curved surface of the reflector, thereby reducing the rigidity requirement of the back frame; the offset of the compact range device can be reduced, thereby reducing cross polarization and the height of target installation in a dark room.
The influence of edge diffraction on a quiet zone is controlled by the aid of an optimized sawtooth structure on the edge of the compact field reflector, namely all sawteeth are distributed in the same length along the radial direction around the geometric center of the reflector, the root of the outline of the inner edge of each sawtooth is concave around the geometric center, the area of the central solid part of the compact field reflector system is increased, and further improvement of the aperture utilization rate and improvement of the performance of the quiet zone at low-frequency lower limit are facilitated.
Compared with the prior art, the utility model has the advantages that:
(1) the utility model improves the aperture utilization rate of the compact range device under the typical index constraint that the amplitude taper of the dead zone is less than 1dB, the aperture utilization rate can reach 60-65 percent, even 70 percent, and is improved by about 25 percent compared with the traditional compact range scheme.
(2) The compact range reflecting surface is a paraboloid of revolution, the reflecting surface is different from a common square caliber with approximate sizes in the horizontal direction and the vertical direction, the caliber of the reflecting surface is a rectangle with obvious size difference in the horizontal direction and the vertical direction, and the caliber and a quiet zone have width-height imbalance. The width-to-height ratio of the dead zone is more than or equal to 2: 1, the width-to-height ratio of the reflecting surface is not more than 3:2, the focal length is close to the long edge of the caliber of the reflecting surface, the short-focus and caliber design solves the problem of width-to-height imbalance, and the performance of a low-frequency quiet zone is improved.
(3) The compact range adopts a diagonal feed type layout, and under the constraint of the same focal length, the three-dimensional field angle of the reflecting surface to the feed source can be reduced, and the irradiation level of the feed source to the reflecting surface is reduced, so that the amplitude taper in a dead zone is reduced, and the reflected caliber utilization rate of the ultra-large compact range is improved. The adopted diagonal feed layout can move forward the quiet zone to relieve the width-height imbalance contradiction introduced by the rectangular caliber by adopting the short-focus design on the premise of not increasing the quiet zone coning, thereby improving the low-frequency performance of the compact range. The low frequency lower limit of the compact range of the present invention enables 300MHz deadband performance, in the region where the deadband size exceeds 20 m.
(4) The virtual vertex of the compact field reflecting surface can shift a small amount (the offset is less than 10 percent of the reflecting surface size) on the premise of not increasing the direct echo of the reflecting surface and the shielding of a feed source on a beam in a dead zone, the requirement on the rigidity of a reflecting surface back frame can be lowered, the cross polarization caused by the offset is reduced, and the erection height of a measured target is reduced.
Drawings
FIG. 1 is a schematic view of a compact range apparatus for a high aperture utilization ultra-large quiet zone;
FIG. 2(a) is a horizontal sectional amplitude profile (0.3, 0.6, 1.2, 2.4GHz) of the front dead zone of a compact range device;
FIG. 2(b) is a phase profile of the horizontal sectional lines of the front dead space of the compact range device (0.3, 0.6, 1.2, 2.4 GHz);
FIG. 3(a) is a horizontal sectional amplitude profile (0.3, 0.6, 1.2, 2.4GHz) of the quiet zone in a compact range unit;
FIG. 3(b) is a horizontal sectional phase profile (0.3, 0.6, 1.2, 2.4GHz) of the quiet zone in a compact range device;
FIG. 4(a) is a compact range device back dead space horizontal sectional amplitude profile (0.3, 0.6, 1.2, 2.4 GHz);
FIG. 4(b) is a phase profile of the horizontal section lines of the back dead space of a compact range device (0.3, 0.6, 1.2, 2.4 GHz);
FIG. 5(a) is a vertical section amplitude profile (0.3, 0.6, 1.2, 2.4GHz) of the front dead space of a compact range device;
FIG. 5(b) is a phase profile of vertical section lines of the front dead space of a compact range device (0.3, 0.6, 1.2, 2.4 GHz);
FIG. 6(a) is a vertical section phase profile (0.3, 0.6, 1.2, 2.4GHz) for the quiet zone in a compact range device;
FIG. 6(b) is a vertical section amplitude profile (0.3, 0.6, 1.2, 2.4GHz) of quiet zone in a compact range device;
FIG. 7(a) is a phase profile of vertical section lines of the back dead space of a compact range device (0.3, 0.6, 1.2, 2.4 GHz);
FIG. 7(b) is a vertical section amplitude profile (0.3, 0.6, 1.2, 2.4GHz) for the back dead space of a compact range device.
The reference numbers in the figures mean:
in fig. 1: 1 is a compact field reflecting surface, 2 is a feed source (positioned at the focal point of the reflecting surface), 3 is a plane wave quiet zone, 4 is a near field observation surface, 5 is a rotational symmetry axis of the reflecting surface, 6 is an electric axis of the reflecting surface, and a virtual vertex 7.
In fig. 2, 3, 4, 5, 6, and 7: the sectional lines are respectively located on the horizontal line (x m) and the vertical line (y m) of the central quiet zone, and the working frequencies are 0.3 GHz, 0.6 GHz, 1.2 GHz and 2.4 GHz.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
According to an embodiment of the present invention, a compact range device for a high aperture utilization ultra-large quiet zone is provided, referring to fig. 1, the compact range device comprising: the compact range comprises a compact range reflecting surface 1, a compact range feed source 2 (located at the focal point of the reflecting surface), a plane wave quiet zone 3, a near zone observation surface 4, a rotating symmetry axis 5 of the reflecting surface, an electric axis 6 of the reflecting surface and a virtual vertex 7.
The compact range reflecting surface 1 is a quadric surface which is processed by precision machining, usually, the central solid part is a paraboloid of revolution, and the edge adopts a sawtooth structure which is used for correcting spherical waves radiated by a feed source into plane waves in a dead zone.
The feed source 2 is an initial electromagnetic wave radiation source of a compact range device;
the plane wave dead zone 3 is a limited three-dimensional space region which meets the requirements of a specific far field test after electromagnetic waves radiated by the feed source are corrected by a reflecting surface.
The compact range device of the ultra-large quiet zone with the high aperture utilization rate adopts diagonal feed layout, the feed source 2 is placed near the focal point of the compact range reflecting surface 1 and close to the position of the projection of the compact range reflecting surface to the angle, so that under the constraint of the same focal length, the three-dimensional field angle of the reflecting surface to the feed source is reduced, the irradiation of the feed source wave beam to the reflecting surface is more uniform, and the reduction of the quiet zone amplitude taper is facilitated.
The compact range reflector 1 is of a rectangular section structure with obvious size difference between a horizontal caliber and a vertical caliber (the difference exceeds 30% of the size of a short side), and the short-focus design (namely, the focus is smaller than the maximum size of the caliber) is beneficial to moving forward the position of a quiet zone, so that the problem of width-height unbalance is avoided, and the low-frequency performance of the quiet zone is improved.
The virtual vertex 7 of the compact range reflecting surface 1 can shift a small amount (shift a small amount in any direction) on the premise of not increasing direct echo of the reflecting surface and shielding a dead zone beam by a feed source, so that the requirement on the rigidity of a reflecting surface back frame is favorably reduced, cross polarization introduced by the offset amount is reduced, and the erection height of a measured target is reduced.
The edge of the ultra-large quiet area compact range system with the high aperture utilization rate adopts optimized sawtooth edge processing to control the influence of edge diffraction on the quiet area, so that the quiet area performance of the low-frequency lower limit is ensured while the aperture utilization rate is further improved.
A preferred embodiment of the utility model:
the compact range device of the ultra-large quiet zone shown in fig. 1 has the working frequency of 0.3, 0.6, 1.2 and 2.4GHz, the width of the reflecting surface is 38 longest wavelengths, the height of the reflecting surface is 28 longest wavelengths, the focal length of the reflecting surface is 38 longest wavelengths, and the feed source is positioned at the focal point of the reflecting surface.
As shown in FIGS. 2-7, under the typical index constraints that the amplitude tapering in the quiet zone is less than 1dB and the peak-to-peak phase value is less than 10 degrees, the aperture utilization rate of both the horizontal section line and the vertical section line of the compact range can reach more than 65%.
The lower low frequency limit of the preferred ultra-large compact range embodiment achieves the typical 300MHz specification over a total quiet zone of greater than 20m with wide high imbalance and narrow edge of the reflector less than 30 wavelengths.
By way of example, the present invention may achieve compact ranges for ultra-large quiet zones with high aperture utilization.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.
Claims (5)
1. The utility model provides a compact range device of high-bore utilization ratio ultra-large-scale quiet district which characterized in that: the compact range antenna comprises a compact range reflecting surface, a feed source and a plane wave quiet zone; the feed source is an electromagnetic wave radiation source of a compact range device; adopting diagonal feed layout, wherein the vertex of the compact field reflecting surface is at the position close to the diagonal of the caliber, and the feed source phase center and the reflecting surface focal point are positioned on the virtual rotation symmetry axis of the reflecting surface;
the compact range reflecting surface is of a quadric surface structure, and the central entity is a revolution paraboloid part and is used for correcting spherical waves radiated by the feed source into plane waves in a quiet zone;
the plane wave dead zone is a limited three-dimensional space area which meets the requirements of far field test after electromagnetic waves radiated by the feed source are corrected by the reflecting surface.
2. The compact range apparatus of claim 1, wherein said compact range apparatus comprises: the compact range device of the ultra-large quiet area with high caliber utilization rate adopts a diagonal feed layout.
3. The compact range apparatus of claim 1, wherein said compact range apparatus comprises: the compact field reflecting surface is a rectangular structure with inconsistent width and height imbalance, and the caliber size difference in the horizontal direction and the vertical direction exceeds 30% of the short side.
4. The compact range apparatus of claim 1, wherein said compact range apparatus comprises: the compact range reflective surface employs an optimized sawtooth edge.
5. The compact range apparatus of claim 1, wherein said compact range apparatus comprises: the aperture utilization rate of the compact range is more than 60%, and the width dimension of the ultra-large quiet zone is more than 20 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121277493.5U CN215575630U (en) | 2021-06-07 | 2021-06-07 | Compact range device of ultra-large quiet area with high aperture utilization rate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121277493.5U CN215575630U (en) | 2021-06-07 | 2021-06-07 | Compact range device of ultra-large quiet area with high aperture utilization rate |
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| CN215575630U true CN215575630U (en) | 2022-01-18 |
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| CN202121277493.5U Active CN215575630U (en) | 2021-06-07 | 2021-06-07 | Compact range device of ultra-large quiet area with high aperture utilization rate |
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- 2021-06-07 CN CN202121277493.5U patent/CN215575630U/en active Active
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