CN111157957A - Millimeter wave radar detection device - Google Patents
Millimeter wave radar detection device Download PDFInfo
- Publication number
- CN111157957A CN111157957A CN201911397246.6A CN201911397246A CN111157957A CN 111157957 A CN111157957 A CN 111157957A CN 201911397246 A CN201911397246 A CN 201911397246A CN 111157957 A CN111157957 A CN 111157957A
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- China
- Prior art keywords
- lens
- millimeter wave
- patch antenna
- patch
- wave radar
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/42—Simultaneous measurement of distance and other co-ordinates
Abstract
The embodiment of the invention provides a millimeter wave radar detection device, which comprises: a support fixture, a patch antenna and a lens; the patch antenna is embedded on the supporting and fixing part; the lens cover is arranged on the patch antenna and fixedly connected with the supporting and fixing piece, the lens is positioned on a radiation path of the patch antenna, and the patch antenna is positioned on a focus of the lens. The embodiment of the invention does not need to be designed into a micro-strip antenna array, is not limited by the length and the number of the array, only needs to adjust the size of the lens, utilizes the refraction and focusing principles of the lens to refract the width of a horizontal beam of a millimeter wave beam emitted by the patch antenna into a very narrow width, refracts the width of a vertical beam into a wide width and then disperses the wide width to each direction, and meanwhile, refracts and gathers millimeter wave beams reflected by targets in each direction onto the patch antenna through the lens, thereby realizing the detection of the distance and the direction of the targets by the millimeter wave beams with the very narrow horizontal beam width and the wide vertical beam width.
Description
Technical Field
The embodiment of the invention relates to the field of radar detection, in particular to a device for detecting a ground target by a millimeter wave radar.
Background
The millimeter wave radar is a radar which operates in a millimeter wave band and detects, and is mainly used for detecting targets in a certain ground area, such as people, vehicles, moving objects and the like. In the conventional technology, when a millimeter wave radar detects, in order to accurately obtain the distance and the direction of a target, a beam with an extremely narrow horizontal beam width and a wide vertical beam width is generally required to be adopted.
To obtain the above beams, the conventional schemes mainly include two types: firstly, a line distribution multi-array element microstrip antenna is adopted, and the line distribution multi-array element microstrip antenna is connected by power dividing microstrips and is arranged into a long linear array to form the wave beam; and secondly, the line distribution multi-array element slot antenna is adopted and is connected by the power division waveguide and is arranged into a long linear array to form the wave beam.
In the process of implementing the invention, the inventor finds that the following problems exist in the prior art: the two schemes are that the beams generated by each array element are combined into the light beam in space, and the horizontal beam width depends on the length of the array or the number of the array elements; the longer the array, the narrower the horizontal beamwidth. However, due to the limitations of the length of the power-dividing microstrip or the power-dividing waveguide and the transmission attenuation on one hand and the limitation of the size of the device on the other hand, the length of the array cannot be too long, that is, the horizontal beam width is difficult to be extremely narrow.
Disclosure of Invention
In order to overcome the problems in the related art, the present application provides a millimeter wave radar detection apparatus having an advantage of being able to detect the distance and the orientation of a target with a millimeter wave beam having an extremely narrow horizontal beam width and a relatively wide vertical beam width.
According to an aspect of an embodiment of the present invention, there is provided a millimeter wave radar detection apparatus including: a supporting fixing member, a patch antenna and a lens;
the patch antenna is embedded on the supporting and fixing part; the lens cover is arranged on the patch antenna and fixedly connected with the supporting and fixing piece, the lens is positioned on a radiation path of the patch antenna, and the patch antenna is positioned on a focus of the lens.
The lens is arranged on the patch antenna, the lens is positioned on the radiation path of the patch antenna, the patch antenna is positioned on the focus of the lens, so that the patch antenna is not required to be designed into a micro-strip antenna array and is not limited by the length and the number of the array, only the size of the lens is required to be adjusted, the width of a horizontal wave beam of a millimeter wave beam emitted by the patch antenna is refracted into an extremely narrow width by utilizing the refraction and focusing principle of the lens, the width of a vertical wave beam is refracted into a wide width and then is dispersed to each direction, meanwhile, the millimeter wave beams reflected by targets in each direction are refracted and focused onto the patch antenna through the lens, the distance and the direction of the target are detected by the millimeter wave beam with the extremely narrow horizontal wave beam width and the relatively wide vertical wave beam width, and the cost is saved; and the accuracy and the attenuation of the antenna power distribution do not need to be considered, so that the difficulty in designing and manufacturing the electromagnetic structure and the circuit structure of the antenna is reduced.
In an exemplary embodiment of the present application, the lens is a convex lens, so that the millimeter wave beam emitted by the patch antenna is dispersed to each required direction through refraction, and the millimeter wave beam in each direction is refracted and focused onto the patch antenna through the lens.
In an exemplary embodiment of the present application, the lens is a spherical lens. The length of the cambered surface on the spherical lens corresponding to the horizontal beam direction of the millimeter wave beam and the length of the cambered surface corresponding to the vertical beam direction of the millimeter wave beam are adjusted, so that the requirements of the patch antenna on the radiation or receiving direction, the requirements of the millimeter wave beam shape and the millimeter wave path and the transmission requirements of the refractive index of the lens material on the millimeter wave path are conveniently met.
In an exemplary embodiment of the present application, the lens is a mirror body made of polytetrafluoroethylene. The lens is designed by adopting the polytetrafluoroethylene material which has high millimeter wave transmittance and can transmit and refract millimeter waves, so that millimeter wave beams are focused and transmitted, and extremely narrow millimeter wave beams are formed.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic perspective view of a side of a millimeter wave radar detection device according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of another side of the millimeter wave radar detection device according to the embodiment of the present invention;
FIG. 3 is a schematic perspective view of the present invention with the lens removed;
FIG. 4 is a top view of a millimeter wave radar detection device shown in an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along A-A of FIG. 4;
fig. 6 is a schematic structural diagram of a metal radiation patch according to an embodiment of the present invention;
fig. 7 is a wave path schematic diagram of a horizontal wave beam formed by the millimeter wave radar detection device according to the embodiment of the present invention;
fig. 8 is a wave path schematic diagram of a vertical beam formed by the millimeter wave radar detection device according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.
In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The word "if/if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination". Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In order to better understand the design idea of the present invention, some technical terms involved in the embodiments of the present invention are described as follows:
the beam width is the angle between two half-power points of the beam. Specifically, the beam width is divided into a horizontal beam width and a vertical beam width; the horizontal beam width is an included angle of two directions, wherein the radiation power of the horizontal beam width is reduced by 3dB on two sides of the maximum radiation direction in the horizontal direction; the vertical beam width is the angle between two directions in which the radiation power is reduced by 3dB on both sides of the maximum radiation direction in the vertical direction. For the detection of ground targets by the millimeter wave radar, the narrower the horizontal beam width is, the higher the azimuth resolution of the detection can be obtained, and the wider the vertical beam width is, the larger the range of the detection can be obtained.
The millimeter wave radar detection device according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 5. Referring to fig. 1, which is a schematic structural diagram of a millimeter wave radar detection device disclosed in an embodiment of the present invention, the millimeter wave radar detection device 10 includes: a support fixture 11, a patch antenna 12, and a lens 13; the patch antenna 12 is embedded in the supporting and fixing member 11; the lens 13 covers the patch antenna 12 and is fixedly connected with the supporting and fixing member 11, the lens 13 is located on a radiation path of the patch antenna 12, and the patch antenna 12 is located on a focus of the lens 13.
By providing a lens 13 on the patch antenna 12, and positioning the lens 13 in the radiation path of the patch antenna 12, the patch antenna 12 is positioned at the focal point of the lens 13, furthermore, the design of a micro-strip antenna array is not needed, the length and the number of the array are not limited, the width of the horizontal wave beam of the millimeter wave beam emitted by the patch antenna 12 is refracted to an extremely narrow width by adjusting the size of the lens 13 and utilizing the refraction and transmission principle of the lens 13, the width of the vertical wave beam is refracted to a wider width and then dispersed to all directions, meanwhile, millimeter wave beams reflected by targets in various directions are refracted and collected onto the patch antenna 12 through the lens 13, the detection of the distance and the direction of the target by the millimeter wave beam with extremely narrow horizontal beam width and wide vertical beam width is realized, and the cost is saved; and the accuracy and the attenuation of the antenna power distribution do not need to be considered, so that the difficulty in designing and manufacturing the electromagnetic structure and the circuit structure of the antenna is reduced.
In an exemplary embodiment of the present application, the supporting and fixing member 11 includes a fixing plate 111 and a supporting bracket 112; the supporting frame 112 is fixedly connected to the fixing plate 111 and located at one side of the fixing plate 111, so as to cooperate with the fixing plate 111 to fix the millimeter wave radar detection device on an external device. A through hole for embedding the patch antenna 12 is formed in the middle of the fixing plate 111, and a fixing bolt for fixing to an external device is formed on the periphery of the fixing plate 111.
Referring to fig. 6, in an exemplary embodiment of the present application, the patch antenna 12 is a microstrip patch antenna 12; the microstrip patch antenna 12 includes a dielectric substrate 121, a metal ground plate (not shown) and a metal radiating patch 122; the metal ground plate and the metal radiation patch are respectively disposed on two opposite surfaces of the dielectric substrate 121, and the ground plate is located on one side of the fixing plate 111 facing the supporting frame 112; the metal radiating patch is located on the side of the fixing plate 111 facing the lens 13. The dielectric substrate 121 may be a PCB board. The metal radiation patch 122 includes an antenna patch 1211 and a microstrip feed line 1212 connected to the antenna patch, and the microstrip feed line 1212 is connected to an external antenna transceiver circuit module through a feed hole on the dielectric substrate 121, so as to feed the antenna patch 1211. The antenna patch can be in the shape of a circle, a rectangle, a triangle, other polygons, and the like.
In an exemplary embodiment of the present application, the lens 13 is a mirror body made of polytetrafluoroethylene. Since the radiation and propagation of the millimeter wave beam have quasi-optical characteristics, the millimeter wave beam is focused and transmitted by using the lens 13 designed from polytetrafluoroethylene (abbreviated as PTFE) which has high millimeter wave transmittance and can transmit and refract millimeter waves, so as to form a very narrow millimeter wave beam. Because the lens 13 is designed and processed in a quasi-optical mode, compared with the lens surface precision requirement required by the optical lens 13, the lens can be completely manufactured in an injection molding mode, and the cost is further reduced.
In an exemplary embodiment of the present application, the lens 13 is a convex lens, so that the millimeter-wave beam emitted from the patch antenna 12 is dispersed to each desired direction through refraction, and the millimeter-wave beam in each direction is refracted and focused onto the patch antenna 12 through the lens 13. Further, the lens 13 is a spherical lens 13, and the length of the arc surface of the spherical lens 13 corresponding to the horizontal beam direction of the millimeter wave beam and the length of the arc surface corresponding to the vertical beam direction of the millimeter wave beam can be adjusted according to the radiation or receiving direction requirement of the patch antenna 12, the millimeter wave beam shape and millimeter wave path requirement, and the transmission requirement of the refractive index of the lens 13 material on the millimeter wave path. In general, the narrower the horizontal beam width requirement, the shorter the arc length of the spherical lens 13 corresponding to the horizontal beam direction of the millimeter wave beam, and the wider the vertical beam width requirement, the longer the arc length of the spherical lens 13 corresponding to the vertical beam direction of the millimeter wave beam.
In an exemplary embodiment of the present application, the millimeter wave radar detection device further includes a lens holder 4; the lens holder 4 includes a first holder 41 and a second holder 42; the first fixing frame 41 and the second fixing frame 42 are fixed on the supporting and fixing member 11 and symmetrically located at two sides of the patch antenna 12; two symmetrical outer side surfaces of the lens 13 are fixedly connected with the first fixing frame 41 and the second fixing frame 42 respectively.
The detection principle of the millimeter wave radar detection device of the present application will be explained in detail below with reference to fig. 7 and 8. As shown in fig. 6, in the horizontal beam width, the millimeter wave beam is emitted via the patch antenna 12, and then is refracted and transmitted by the lens 13 into a beam as narrow as possible; as shown in fig. 7, in the vertical beam width, after the millimeter wave beam is emitted through the patch antenna 12, the millimeter wave beam is refracted and reflected by the lens 13 into a beam as wide as possible, specifically, 80GHz millimeter wave is selected, and the data obtained by detecting the 2cm aluminum square bar 5 meters away from the millimeter wave radar detection device is as follows:
| horizontal angle position: | left 3 ° | Left 2 ° | Left 1 ° | 0° | Right 1 degree | Right 2 degree | 3 degree to the right |
| Reflection intensity value: | 48 | 271 | 635 | 870 | 646 | 290 | 53 |
table one: relationship between horizontal angle position and reflected intensity value of millimeter wave beam
Since the radiation power is proportional to the square of the reflection intensity, and the position where the reflection intensity drops from the central maximum value to 70.7% of the central maximum value is the beam width, it can be seen from the above table (a) that the millimeter wave beam emitted by the actual design is made, the central 0 ° maximum reflection intensity value is 870, the left and right 1 ° reflection intensity values are 635 and 646, which are 72.9% and 74.2% of the central maximum value, respectively, that is, the included angle between the two directions where the radiation power drops by 3dB is far lower than 3 ° horizontally on both sides of the horizontal direction maximum radiation direction of 0 °.
Table two: relationship between vertical angle position and reflected intensity value of millimeter wave beam
Since the radiation power is proportional to the square of the reflection intensity, and the position where the reflection intensity drops from the central maximum value to 70.7% of the central maximum value is the beam width, it can be seen from the above table (ii) that the millimeter wave beam emitted by the actual design is made, the central 0 ° maximum reflection intensity value is 872, the upper and lower 50 ° reflection intensity values are 661 and 683, which are 75.8% and 78.3% of the central maximum value, respectively, that is, on both sides of the vertical direction maximum radiation direction 0 °, the included angle between the two directions where the radiation power drops by 3dB is horizontal, that is, the vertical beam width is greater than 100 °.
Therefore, the millimeter wave radar detection device can meet the requirements that the horizontal beam width is extremely narrow and the vertical beam width is wide, and the 3dB width of the horizontal beam is narrower and better, so that the distance and the direction of a ground target are detected.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A millimeter wave radar detection device, comprising: a patch antenna, a lens and a support fixture;
the patch antenna is embedded on the supporting and fixing part; the lens cover is arranged on the patch antenna and fixedly connected with the supporting and fixing piece, the lens is positioned on a radiation path of the patch antenna, and the patch antenna is positioned on a focus of the lens.
2. The millimeter-wave radar detection device of claim 1, wherein the lens is a convex lens.
3. A millimeter wave radar detection device according to claim 1, wherein the lens is a spherical lens.
4. A millimeter wave radar detection device according to claim 1, wherein the lens is a mirror body made of polytetrafluoroethylene.
5. The millimeter wave radar detection device of claim 1, further comprising a lens mount; the lens fixing piece comprises a first fixing frame and a second fixing frame; the first fixing frame and the second fixing frame are fixed on the supporting and fixing piece and are symmetrically positioned on two sides of the patch antenna; and two symmetrical outer side surfaces of the lens are respectively and fixedly connected with the first fixing frame and the second fixing frame.
6. The millimeter wave radar detection device of any one of claims 1 to 5, wherein the support fixture includes a fixed plate and a support bracket; the support frame is fixedly connected with the fixing plate and is positioned on one side of the fixing plate so as to be matched with the fixing plate to fix the millimeter wave radar detection irradiation device on external equipment.
7. The millimeter wave radar detection device according to claim 6, wherein a through hole for embedding the patch antenna is provided in a middle portion of the fixing plate.
8. A millimeter wave radar detection device according to claim 6, wherein the patch antenna is a microstrip patch antenna.
9. The millimeter-wave radar detection device of claim 8, wherein the microstrip patch antenna comprises a dielectric substrate, a metal ground plane and a metal radiating patch; the metal grounding plate and the metal radiation patch are respectively arranged on two opposite surfaces of the medium substrate, and the grounding plate is positioned on one side of the fixing plate facing the support frame; the metal radiating patch is located on a side of the fixing plate facing the lens.
10. The millimeter wave radar detection device according to claim 9, wherein the metal radiation patch includes an antenna patch and a microstrip feed line connected to the antenna patch, and the microstrip feed line is connected to an external antenna transceiver circuit module through a feed hole on the dielectric substrate, so as to feed the antenna patch.
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| CN201911397246.6A CN111157957A (en) | 2019-12-30 | 2019-12-30 | Millimeter wave radar detection device |
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| CN201911397246.6A CN111157957A (en) | 2019-12-30 | 2019-12-30 | Millimeter wave radar detection device |
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| CN116486653A (en) * | 2023-05-05 | 2023-07-25 | 哈尔滨工业大学（威海） | Traffic blind area monitoring-oriented coming vehicle reminding device and reminding method |
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