Roadside 4D millimeter wave radar antenna array

Abstract

The utility model discloses a roadside 4D millimeter wave radar antenna array, which comprises a group of receiving arrays and two groups of transmitting arrays, the receiving arrays comprise m receiving array elements, and the two groups of transmitting arrays respectively comprise m / 2 transmitting array elements; wherein one group of transmitting array comprises m / 2 wide-beam array elements and is a short-distance transmitting array; the other group of transmitting array comprises m / 2 narrow beam array elements and is a long-distance transmitting array; the m receiving array elements comprise a plurality of obliquely arranged array elements and a plurality of horizontally arranged array elements; and each group of transmitting array comprises a plurality of obliquely arranged array elements and a plurality of horizontally arranged array elements. According to the antenna array, through the combination of an inclined array and a horizontal array, the array calibers of the azimuth dimension and the pitching dimension are simultaneously ensured in a limited physical space; meanwhile, the antenna array is provided with a plurality of receiving channels in the horizontal dimension and the pitching dimension, and high sidelobe suppression can be achieved while the aperture of the antenna is guaranteed through the arrangement of the intervals of the array elements.

Description

Technical Field

[0001] The utility model belongs to the technical field of millimeter-wave radar, and particularly relates to a roadside 4D millimeter-wave radar antenna array. Background Art

[0002] 4D millimeter-wave radar has been widely used in roadside sensing scenarios. The improvement of the angular resolution of millimeter-wave radar depends on the increase of the antenna aperture. At the same time, the actual detection effect also depends on the sidelobe suppression ratio of the array. Higher sidelobe suppression can effectively improve the signal-to-noise ratio of the received signal. Most of the existing 4D millimeter-wave radar antenna arrays adopt a rectangular structure, which has the advantages that the design and simulation are relatively easy to implement, but the disadvantage is that there are too many repeated channels after MIMO, the channel utilization rate is not high, and it is not conducive to sidelobe suppression. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a roadside 4D millimeter-wave radar antenna array aiming at the problems existing in the above-mentioned prior art.

[0004] The technical solution for realizing the purpose of the utility model is: a roadside 4D millimeter-wave radar antenna array, which utilizes the characteristic that the oblique channels can be simultaneously applied to the azimuth and elevation calculations, and through the combination of the oblique array and the horizontal array, ensures the array aperture in both the azimuth dimension and the elevation dimension within a limited physical space; at the same time, the antenna array is provided with multiple receiving channels in both the horizontal and elevation dimensions, and the spacing of each array element is set to ensure a reasonable spatial sampling interval, so as to achieve higher sidelobe suppression while ensuring the antenna aperture.

[0005] Further, the antenna array includes a group of receiving arrays and two groups of transmitting arrays, wherein the receiving array includes m receiving array elements, and each of the two groups of transmitting arrays includes m / 2 transmitting array elements;

[0006] One of the groups of transmitting arrays includes m / 2 wide-beam array elements, which is a near-range transmitting array for covering near-range targets; the other group of transmitting arrays includes m / 2 narrow-beam array elements, which is a far-range transmitting array for covering far-range targets; the near-range targets and far-range targets are defined and divided according to the actual situation;

[0007] The m receiving array elements include several obliquely arranged array elements and several horizontally arranged array elements, and the horizontal arrangement and the oblique arrangement share one array element;

[0008] Each group of transmitting arrays includes several obliquely arranged array elements and several horizontally arranged array elements, and the horizontal arrangement and the oblique arrangement share one array element.

[0009] Further, the obliquely arranged array elements in the transmitting array and the receiving array are both arranged from the upper left to the lower right.

[0010] Further, m = 16.

[0011] Further, both the near - range transmitting array and the far - range transmitting array include 5 horizontally - arranged array elements and 4 obliquely - arranged array elements; the receiving array includes 8 obliquely - arranged array elements and 9 horizontally - arranged array elements.

[0012] Further, in the near - range transmitting array, the spacings of the horizontally - arranged array elements, from left to right, are: 2.5λ, 4.5λ, 2.5λ, 5.5λ; the horizontal spacings of the obliquely - arranged array elements, from left to right, are: 2λ, 3.5λ, 5.5λ, and the vertical spacings of the obliquely - arranged array elements, from top to bottom, are: 11λ, 13.5λ, 1.5λ, where λ is the wavelength.

[0013] Further, in the far - range transmitting array, the spacings of the horizontally - arranged array elements, from left to right, are: 2.5λ, 4.5λ, 2.5λ, 5.5λ; the horizontal spacings of the obliquely - arranged array elements, from left to right, are: 2λ, 7.5λ, 6λ, and the vertical spacings of the obliquely - arranged array elements, from top to bottom, are: 8.5λ, 5.5λ, 12λ.

[0014] Further, the receiving array and the transmitting array are applicable to MIMO radar.

[0015] Compared with the prior art, the remarkable advantages of the present utility model are as follows: through the oblique - array method, the limited physical channels are simultaneously applied to the angle resolution in both the azimuth dimension and the elevation dimension. While expanding the aperture of the antenna array, the number of receiving channels in both the azimuth and elevation dimensions is ensured. Combined with the precise calculation of the element spacing, a reasonable spatial sampling interval is ensured, and high sidelobe suppression is achieved.

[0016] The present utility model will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the roadside 4D millimeter - wave radar antenna array in an embodiment.

[0018] Figure 2 It is a schematic diagram of the MIMO channels of the near - range transmitting array in an embodiment, where the underlined channels are the oblique channels in the MIMO channels of the near - range array that can be simultaneously applied to the angle resolution in the azimuth direction and the elevation direction.

[0019] Figure 3 It is a schematic diagram of the MIMO channels of the far - range transmitting array in an embodiment, where the underlined channels are the oblique channels in the MIMO channels of the far - range array that can be simultaneously applied to the angle resolution in the azimuth direction and the elevation direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following further elaborates on this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this application and are not used to limit this application.

[0021] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of this utility model, then such directional indications are only used to explain the relative positional relationships, movement conditions, etc. between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0022] In one embodiment, in combination with Figure 1 , a roadside 4D millimeter-wave radar antenna array is provided, which includes a group of receiving arrays and two groups of transmitting arrays. The receiving array includes m receiving elements, and each of the two groups of transmitting arrays includes m / 2 transmitting elements;

[0023] One of the groups of transmitting arrays includes m / 2 wide-beam elements, which is a near-range transmitting array for covering near-range targets; the other group of transmitting arrays includes m / 2 narrow-beam elements, which is a far-range transmitting array for covering far-range targets; the near-range targets and far-range targets are custom-defined according to actual situations;

[0024] The m receiving elements include several obliquely arranged elements and several horizontally arranged elements, and the horizontal arrangement and the oblique arrangement share one element;

[0025] Each group of transmitting arrays includes several obliquely arranged elements and several horizontally arranged elements, and the horizontal arrangement and the oblique arrangement share one element.

[0026] In some embodiments, the obliquely arranged elements in the transmitting array and the receiving array are both arranged from the upper left to the lower right.

[0027] Preferably, in some embodiments, m = 16. The near-range transmitting array and the far-range transmitting array both include 5 horizontally arranged elements and 4 obliquely arranged elements; the receiving array includes 8 obliquely arranged elements and 9 horizontally arranged elements.

[0028] Preferably, in some embodiments, in the near-range transmitting array, the spacings of the horizontally arranged elements from left to right are successively: 2.5λ, 4.5λ, 2.5λ, 5.5λ; the horizontal spacings of the obliquely arranged elements from left to right are successively: 2λ, 3.5λ, 5.5λ, and the vertical spacings of the obliquely arranged elements from top to bottom are successively: 11λ, 13.5λ, 1.5λ, where λ is the wavelength.

[0029] Preferably, in some embodiments, in the far - distance transmitting array, the spacings between the horizontally - arranged array elements are, from left to right in sequence: 2.5λ, 4.5λ, 2.5λ, 5.5λ; the horizontal spacings between the obliquely - arranged array elements are, from left to right in sequence: 2λ, 7.5λ, 6λ, and the vertical spacings between the obliquely - arranged array elements are, from top to bottom in sequence: 8.5λ, 5.5λ, 12λ.

[0030] Preferably, in some embodiments, the receiving array and the transmitting array are applicable to MIMO radar.

[0031] Combined with Figure 2 and Figure 3 , the array of the present utility model utilizes the feature that the oblique channels can be simultaneously applied to the azimuth and elevation calculations. Through the combination of the oblique - direction array and the horizontal - direction array, the array apertures in both the azimuth and elevation dimensions are ensured simultaneously within a limited physical space. At the same time, the array has more receiving channels in both the horizontal and elevation dimensions, accurately calculates the spacings between each array element, ensures a reasonable spatial sampling interval, and achieves a high sidelobe suppression while ensuring the antenna aperture. Due to the above - mentioned excellent performance of the array, the transmitting array can be divided into 2 groups: one group is a wide - beam near - distance array, and the other group is a narrow - beam far - distance array. Although the number of transmitting array elements in each group is only 8, high resolution and a high sidelobe suppression ratio are still ensured.

[0032] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above - mentioned embodiments. What is described in the above - mentioned embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, any modifications, equivalent replacements, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A roadside 4D millimeter wave radar antenna array, characterized in that: The antenna array ensures the array aperture in both azimuth and elevation dimensions within a limited physical space through the combination of oblique arrays and horizontal arrays; at the same time, the antenna array is provided with multiple receiving channels in both horizontal and elevation dimensions, and the spacing between array elements is set to ensure the antenna aperture while achieving high sidelobe suppression.

2. The roadside 4D millimeter wave radar antenna array according to claim 1, characterized in that: The antenna array includes a receiving array and two transmitting arrays, wherein the receiving array includes m receiving array elements, and the two transmitting arrays each include m / 2 transmitting array elements; One group of transmitting arrays includes m / 2 wide beam array elements, which is a short-range transmitting array for covering short-range targets; the other group of transmitting arrays includes m / 2 narrow beam array elements, which is a long-range transmitting array for covering long-range targets; the short-range targets and long-range targets are divided according to the actual situation; The m receiving array elements include a plurality of array elements arranged diagonally and a plurality of array elements arranged horizontally, and the horizontal arrangement and the diagonal arrangement multiplex one array element; Each group of transmitting arrays includes a plurality of array elements arranged diagonally and a plurality of array elements arranged horizontally, and the horizontal arrangement and the diagonal arrangement multiplex one array element.

3. The roadside 4D millimeter wave radar antenna array according to claim 2, characterized in that: The obliquely arranged array elements in the transmitting array and the receiving array are arranged from the upper left to the lower right.

4. The roadside 4D millimeter wave radar antenna array according to claim 2, characterized in that: The m=16.

5. The roadside 4D millimeter wave radar antenna array according to claim 4, characterized in that: The short-range transmitting array and the long-range transmitting array both include 5 array elements arranged horizontally and 4 array elements arranged diagonally; the receiving array includes 8 array elements arranged diagonally and 9 array elements arranged horizontally.

6. The roadside 4D millimeter wave radar antenna array according to claim 4, characterized in that: In the close-range transmitting array, the spacing of the horizontally arranged array elements is 2.5λ, 4.5λ, 2.5λ, and 5.5λ from left to right; the horizontal spacing of the obliquely arranged array elements is 2λ, 3.5λ, and 5.5λ from left to right, and the vertical spacing of the obliquely arranged array elements is 11λ, 13.5λ, and 1.5λ from top to bottom, where λ is the wavelength.

7. The roadside 4D millimeter wave radar antenna array according to claim 4, characterized in that: In the long-range transmitting array, the spacing of the horizontally arranged array elements is 2.5λ, 4.5λ, 2.5λ, and 5.5λ from left to right; the horizontal spacing of the obliquely arranged array elements is 2λ, 7.5λ, and 6λ from left to right; and the vertical spacing of the obliquely arranged array elements is 8.5λ, 5.5λ, and 12λ from top to bottom.

8. The roadside 4D millimeter wave radar antenna array according to claim 2, characterized in that: The receiving array and the transmitting array are suitable for MIMO radar.

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