Vehicle dual-peak antenna assembly, method for determining preparation parameters, automotive radar, and vehicle

Abstract

This application relates to the field of vehicle detection, and particularly to a vehicle dual-peak antenna assembly, a preparation parameter determination method, an automotive radar, and a vehicle; the vehicle dual-peak antenna assembly includes a main branch antenna and a secondary branch antenna, the main branch antenna and the secondary branch antenna are arranged at intervals and are electrically connected; the ratio between the feeding amplitude of the main branch antenna and the feeding amplitude of the secondary branch antenna is 1:0.05 to 1:0.35; the difference between the feeding phase of the main branch antenna and the feeding phase of the secondary branch antenna is 90 to 270°; the vehicle dual-peak assembly in this application uses the main branch antenna and the secondary branch antenna, and by setting the feeding amplitude ratio of the main branch antenna and the secondary branch antenna to 1:0.05 to 1:0.35, the vehicle can achieve the farthest detection distance in the due rear and due side directions while avoiding the generation of detection blind spots and improving the detection performance of the automotive radar system.

Description

Technical Field

[0001] The present application relates to the field of vehicle detection, and particularly relates to a vehicle dual-peak antenna assembly, a method for determining preparation parameters, an automotive radar, and a vehicle. Background Art

[0002] When an automotive radar is installed on the edge of the rear of a vehicle, in order to increase the detection range directly behind and directly to the side of the vehicle, in the prior art, a partial beam antenna or a difference beam antenna is often used as the automotive radar antenna. However, both the partial beam antenna and the difference beam antenna used in existing vehicles during detection have detection null points, which causes the automotive radar system containing the partial beam antenna or the difference beam antenna to be unable to detect a target in a specific direction, resulting in a detection blind spot for the automotive radar. Summary of the Invention

[0003] In view of the above problems in the prior art, the present application provides a vehicle dual-peak antenna assembly, which uses a main branch antenna and a sub-branch antenna. By setting the feed amplitude ratio of the main branch antenna and the sub-branch antenna to 1:0.05 to 1:0.35, while enabling the vehicle to achieve the farthest detection range directly behind and directly to the side, it avoids generating detection blind spots and improves the detection performance of the automotive radar system.

[0004] On the one hand, a vehicle dual-peak antenna assembly provided by the present application includes a main branch antenna and a sub-branch antenna. The main branch antenna and the sub-branch antenna are arranged at intervals and are electrically connected;

[0005] The feed amplitude ratio between the feed amplitude of the main branch antenna and the feed amplitude of the sub-branch antenna is 1:0.05 to 1:0.35;

[0006] The feed phase difference between the feed phase of the main branch antenna and the feed phase of the sub-branch antenna is 90 to 270°.

[0007] In some embodiments, when the main branch antenna and the sub-branch antenna respectively conduct the same feed current transmission alone, the difference between the relative field strengths of the radiation fields of the main branch antenna and the sub-branch antenna in the same direction is within a preset error range.

[0008] In some embodiments, when the main branch antenna and the sub-branch antenna respectively conduct the same feed current transmission alone, the maximum gain directions of the main branch antenna and the sub-branch antenna are between -10° and 10°, and the 3dB beam width is greater than or equal to 20°.

[0009] In some embodiments, when the main branch antenna and the sub-branch antenna respectively conduct the same feed current transmission alone, the maximum gain directions of the main branch antenna and the sub-branch antenna are between -10° and 10°, and the 3dB beam width is greater than or equal to 40°.

[0010] In some embodiments, when the main branch antenna and the sub - branch antenna separately conduct the same feeding current transmission, the maximum gain directions of the main branch antenna and the sub - branch antenna are between - 10° and 10°, and the 3dB beam width is greater than or equal to 60°.

[0011] In some embodiments, when the main branch antenna and the sub - branch antenna separately conduct the same feeding current transmission, the maximum gain directions of the main branch antenna and the sub - branch antenna are between - 2° and 2°, and the 3dB beam width is greater than or equal to 60°.

[0012] In some embodiments, the main branch antenna and the sub - branch antenna can transmit electromagnetic waves with the same wavelength;

[0013] The distance between the main branch antenna and the sub - branch antenna is 0.3 - 0.5 times the wavelength of the electromagnetic wave.

[0014] In some embodiments, the feeding amplitude ratio between the feeding amplitude of the main branch antenna and the feeding amplitude of the sub - branch antenna is 1:0.08 - 1:0.3;

[0015] The feeding phase difference between the feeding phase of the main branch antenna and the feeding phase of the sub - branch antenna is 170 - 190°;

[0016] The distance between the main branch antenna and the sub - branch antenna is 0.41 - 0.5 times the wavelength of the electromagnetic wave.

[0017] On the other hand, the present application provides a method for determining preparation parameters of a vehicle - mounted dual - peak antenna assembly, which is applied to the preparation of a vehicle - mounted dual - peak antenna assembly; the vehicle - mounted dual - peak antenna assembly includes a main branch antenna and a sub - branch antenna, and the method includes:

[0018] Obtain antenna array parameters, automotive radar detection parameters, and installation angles; the antenna array parameters include the spatial dimension parameters of the array space for accommodating the antenna assembly in the automotive radar and the number of components of the vehicle - mounted dual - peak antenna assembly;

[0019] Perform a preset screening according to the spatial dimension parameters and the number of components to obtain the element size;

[0020] Calculate the antenna width according to the element size to obtain the antenna width;

[0021] According to the automotive radar detection parameters and the installation angles, and based on the symmetry of the radiation pattern, perform normalization calculation for the antenna gain to obtain the antenna gain in each direction of the antenna dual - peak radiation pattern;

[0022] Based on the antenna width and the antenna gains in each direction, draw a corresponding target dual-peak pattern; the target dual-peak pattern has pattern symmetry;

[0023] Based on the target dual-peak pattern, determine the final value of the feed amplitude ratio, the final value of the feed phase difference, the final value of the beam width, and the final value of the antenna spacing of the vehicle-mounted dual-peak antenna assembly to be prepared.

[0024] Specifically, based on the target dual-peak pattern, determining the final value of the feed amplitude ratio, the final value of the feed phase difference, the final value of the beam width, and the final value of the antenna spacing of the vehicle-mounted dual-peak antenna assembly to be prepared includes:

[0025] Obtain a sample data set, where the sample data set includes a plurality of reference feed amplitude ratios, reference phase differences, reference beam widths, and reference antenna spacings;

[0026] Obtain the reference dual-peak patterns corresponding to the plurality of reference feed amplitude ratios, reference phase differences, reference beam widths, and reference antenna spacings;

[0027] Based on the similarity comparison result between the reference dual-peak pattern and the target dual-peak pattern, screen out the initial values of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing of the target dual-peak pattern from the plurality of reference feed amplitude ratios, reference phase differences, reference beam widths, and reference antenna spacings;

[0028] According to the initial value of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing, construct a dual-peak antenna assembly model;

[0029] Obtain the update values corresponding to at least one of the initial value of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing, and perform corresponding update processing;

[0030] Based on the updated initial value of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing, simulate the operation of the vehicle-mounted dual-peak antenna assembly model to obtain a simulated dual-peak pattern;

[0031] When the similarity between the simulated dual-peak pattern and the target dual-peak pattern meets a preset condition, determine the simulated values of the feed amplitude ratio, the simulated value of the feed phase difference, the simulated value of the beam width, and the simulated value of the antenna spacing corresponding to the simulated dual-peak pattern as the final values of the feed amplitude ratio, the final value of the feed phase difference, the final value of the beam width, and the final value of the antenna spacing of the vehicle-mounted dual-peak antenna assembly to be prepared.

[0032] On the other hand, the present application also provides an automotive radar, which includes at least one vehicle-mounted dual-peak antenna assembly in the present application.

[0033] On the other hand, the present application also provides a vehicle, which includes the automotive radar in the present application.

[0034] Based on the above technical solutions, a vehicle-mounted dual-peak antenna assembly provided by the present application has the following beneficial effects:

[0035] 1. For a vehicle-mounted dual-peak antenna assembly provided by the present application, a main branch antenna and a sub-branch antenna are adopted, and the feed amplitude ratio of the main branch antenna and the sub-branch antenna is set to 1:0.05 to 1:0.35, so that when the vehicle is directly behind and directly to the side, the farthest detection distance can be achieved while avoiding detection blind spots of the automotive radar, and the detection performance of the automotive radar system is improved.

[0036] 2. For a vehicle-mounted dual-peak antenna assembly provided by the present application, by adjusting the antenna parameters of the main branch antenna and the sub-branch antenna, the antenna directions of the main branch antenna and the sub-branch antenna Figure 1 are made consistent, and then the antenna dual-peak pattern of the vehicle-mounted dual-peak antenna assembly has symmetry, reducing the direction limitation during the installation of the automotive radar, improving the installation flexibility of the radar, and reducing the operation difficulty.

[0037] 3. For a vehicle-mounted dual-peak antenna assembly provided by the present application, the beams emitted by the main branch antenna and the sub-branch antenna in any detection direction are both wide beams, and the distance between the main branch antenna and the sub-branch antenna is 0.3 to 0.5 times the wavelength of the electromagnetic wave, ensuring a good field of view of the automotive radar, and after the automotive radar is installed, ensuring that the maximum gain direction of the antenna pattern of the antenna assembly is at the 45° direction, and further ensuring that the best detection area of the radar is directly behind and directly to the side of the vehicle. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0039] Figure 1 is a schematic structural diagram of a vehicle-mounted dual-peak antenna assembly provided by an embodiment of the present application;

[0040] Figure 2 is the dual-peak pattern of a vehicle-mounted dual-peak antenna assembly provided by an embodiment of the present application;

[0041] Figure 3It is the antenna pattern of the main branch antenna or the sub-branch antenna of a vehicle-mounted dual-peak antenna assembly provided by an embodiment of the present application in the maximum gain direction;

[0042] Figure 4 It is a schematic flowchart of a method for determining preparation parameters of a vehicle-mounted dual-peak antenna assembly provided by an embodiment of the present application;

[0043] Figure 5 It is a schematic installation diagram of an automotive radar provided by an embodiment of the present application;

[0044] Figure 6 It is the antenna pattern of a vehicle-mounted dual-peak antenna assembly before and after adjusting the feed amplitude ratio provided by an embodiment of the present application;

[0045] Figure 7 It is the antenna pattern of a vehicle-mounted dual-peak antenna assembly before and after adjusting the phase difference provided by an embodiment of the present application;

[0046] Figure 8 It is the antenna pattern of a vehicle-mounted dual-peak antenna assembly before and after adjusting the beam width provided by an embodiment of the present application;

[0047] Figure 9 It is the antenna pattern of a vehicle-mounted dual-peak antenna assembly before and after adjusting the antenna spacing provided by an embodiment of the present application.

[0048] Among them, 1 - main branch antenna, 2 - sub-branch antenna, 3 - first connection cable, 4 - second connection cable, 5 - vehicle body, 6 - automotive radar, A - vehicle driving direction. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0050] As used herein, "an embodiment" or "embodiments" refer to specific features, structures, or characteristics that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationships indicated by terms such as "upper", "lower", "left", "right", "top", "bottom", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0051] Before further elaborating on the embodiments of the present application, the nouns and terms involved in the embodiments of the present application are described. The nouns and terms involved in the embodiments of the present application are applicable to the following explanations.

[0052] Antenna radiation pattern: It refers to the relative field strength of the radiation field at a certain distance from the antenna; the antenna radiation pattern can reflect the magnitude of the antenna gain, and the antenna gain is used to measure the ability of the antenna to transmit and receive signals in a specific direction.

[0053] The following combines Figures 1-3 , the embodiments of the present application provide a vehicle-mounted dual-peak antenna assembly. The vehicle-mounted dual-peak antenna assembly is installed in an automotive radar, and specifically includes a main branch antenna 1 and a sub-branch antenna 2. The main branch antenna 1 and the sub-branch antenna 2 are arranged at intervals and are electrically connected; the feed amplitude ratio between the feed amplitude of the main branch antenna 1 and the feed amplitude of the sub-branch antenna 2 is 1:0.05 to 1:0.35; the feed phase difference between the feed phase of the main branch antenna 1 and the feed phase of the sub-branch antenna 2 is 90 to 270°. The feed here refers to the process of the power supply delivering electrical energy to a power-consuming unit or device. Correspondingly, the feed amplitude ratio is the current intensity ratio delivered to the main branch antenna 1 and the sub-branch antenna 2, and the difference between the feed phases is the current phase difference delivered to the main branch antenna 1 and the sub-branch antenna 2; by using the main branch antenna 1 and the sub-branch antenna 2 and setting the feed amplitude ratio of the main branch antenna 1 and the sub-branch antenna 2 to 1:0.05 to 1:0.35, the vehicle can achieve the farthest detection distance at the due rear and due side while avoiding the generation of detection blind spots and improving the detection performance of the automotive radar system.

[0054] In an embodiment of the present application, the vehicle-mounted dual-peak antenna assembly further includes a first connection cable 3 and a second connection cable 4. One end of the first connection cable 3 is connected to the main branch antenna 1, and the other end of the first connection cable 3 is connected to the antenna interface of the automotive radar. One end of the second connection cable 4 is connected to the sub-branch antenna 2, and the other end of the second connection cable 4 is connected to the antenna interface of the automotive radar. Specifically, the cable width of the first connection cable 3 is different from the cable width of the second connection cable 4; the cable length of the first connection cable 3 is different from the cable length of the second connection cable 4.

[0055] Specifically, as Figure 1 shown, the cable width of the first connection cable 3 is greater than the cable width of the second connection cable 4. When the ratio between the cable width of the first connection cable 3 and the cable width of the second connection cable 4 increases, the feed amplitude ratio increases accordingly; the cable length of the first connection cable 3 is less than the cable length of the second connection cable 4. When the length ratio between the first connection cable 3 and the second connection cable 4 changes, the current phase difference transmitted to the main branch antenna 1 and the sub-branch antenna 2 changes accordingly, thereby realizing the change of the feed phase difference between the main branch antenna 1 and the sub-branch antenna 2; by adjusting the preset ratio between the first connection cable 3 and the second connection cable 4, the adjustment of the feed amplitude ratio and the feed phase difference can be realized. In this way, by simply adjusting the cable size, the precise adjustment of the feed amplitude ratio and the feed phase difference can be realized, reducing the requirements for the antenna structure setting and the manufacturing cost.

[0056] In other embodiments of the present application, the main branch antenna 1 and the sub-branch antenna 2 are connected through a waveguide.

[0057] In an embodiment of the present application, the feed amplitude ratio of the main branch antenna 1 and the sub-branch antenna 2 is set to 1:0.25, thereby changing the null depth of the vehicle-mounted dual-peak antenna assembly. While enabling the vehicle to achieve the farthest detection distance in the due rear and due side directions, detection blind spots are avoided, and the detection performance of the automotive radar system is improved.

[0058] In some embodiments, the difference between the feed phase of the main branch antenna 1 and the feed phase of the sub-branch antenna 2 is set to 180°. In this way, by staggering the feed phase of the main branch antenna 1 and the feed phase of the sub-branch antenna 2, the detection distance of the radar can be effectively increased.

[0059] In the embodiments of the present application, when the main branch antenna 1 and the sub-branch antenna 2 separately conduct the same feeding current transmission, the difference between the relative field strengths of the radiation fields of the main branch antenna 1 and the sub-branch antenna 2 in the same direction is within a preset error range; at the same feeding amplitude ratio, by making the difference between the relative field strengths of the radiation fields of the main branch antenna 1 and the sub-branch antenna 2 in the same direction within the preset error range, there is no detection zero point in the detection range of the vehicle-mounted dual-peak antenna assembly, thereby avoiding the detection blind spot of the automotive radar.

[0060] In some embodiments, refer to the attached drawings of the specification Figure 5 , at the same feeding amplitude ratio, the difference between the relative field strengths of the radiation fields of the main branch antenna 1 and the sub-branch antenna 2 in the same direction is zero, and the antenna pattern shapes of the main branch antenna 1 and the sub-branch antenna 2 are the same. Furthermore, the detection field of the vehicle-mounted dual-peak antenna assembly is symmetrical about the installation axis of the automotive radar, and an antenna dual-peak pattern with two identical single peaks can be formed. The detection 0° axis on the antenna dual-peak pattern corresponds to the installation axis of the automotive radar. When the antenna pattern of the vehicle-mounted dual-peak antenna assembly is a symmetrical antenna dual-peak pattern, both ends of the vehicle-mounted dual-peak antenna assembly can be adapted to the corresponding installation positions of the automotive radar, thereby reducing the direction limitation during the installation of the automotive radar, improving the installation flexibility of the radar, and reducing the operation difficulty.

[0061] In the embodiments of the present application, the beams emitted by the main branch antenna 1 and the sub-branch antenna 2 in any detection direction are wide beams. Based on the fact that the beam can be visualized as an antenna pattern, refer to the attached drawings of the specification Figure 3 , when the main branch antenna 1 and the sub-branch antenna 2 separately conduct the same feeding current transmission, the maximum gain directions of the main branch antenna 1 and the sub-branch antenna 2 are between -10° and 10°, and the 3dB beam width is greater than or equal to 20°.

[0062] In some embodiments, when the main branch antenna 1 and the sub-branch antenna 2 separately conduct the same feeding current transmission, the maximum gain directions of the main branch antenna 1 and the sub-branch antenna 2 are between -10° and 10°, and the 3dB beam width is greater than or equal to 40°.

[0063] In some embodiments, when the main branch antenna 1 and the sub-branch antenna 2 separately conduct the same feeding current transmission, the maximum gain directions of the main branch antenna 1 and the sub-branch antenna 2 are between -10° and 10°, and the 3dB beam width is greater than or equal to 60°.

[0064] In some embodiments, when the main branch antenna 1 and the sub-branch antenna 2 separately conduct the same feeding current transmission, the maximum gain directions of the main branch antenna 1 and the sub-branch antenna 2 are between -2° and 2°, and the 3dB beam width is greater than or equal to 60°.

[0065] By adjusting the beam widths of the main branch antenna 1 and the sub-branch antenna 2 emitted in the maximum gain direction, the detection and scanning field of view of the automotive radar can be adjusted, as well as the direction of the maximum gain on the vehicle-mounted dual-peak antenna assembly.

[0066] In the embodiments of the present application, the main branch antenna 1 and the sub-branch antenna 2 can transmit electromagnetic waves with the same wavelength; the distance between the main branch antenna 1 and the sub-branch antenna 2 is 0.3 to 0.5 times the wavelength of the electromagnetic wave.

[0067] In some embodiments, the feed amplitude ratio between the feed amplitude of the main branch antenna 1 and the feed amplitude of the sub-branch antenna 2 is 1:0.08 to 1:0.3; the feed phase difference between the feed phase of the main branch antenna 1 and the feed phase of the sub-branch antenna 2 is 170 to 190°; the distance between the main branch antenna 1 and the sub-branch antenna 2 is 0.41 to 0.5 times the wavelength of the electromagnetic wave.

[0068] In some embodiments, all the antenna parameters of the main branch antenna 1 and the sub-branch antenna 2 are the same, and the antenna parameters may include but are not limited to the wavelength of the electromagnetic wave transmitted by the antenna and the appearance shape and size of the antenna. Thus, while saving the design cost, the shape of the vehicle-mounted dual-peak antenna assembly is ensured to be regular, thereby reducing the layout design limitations of the antenna array in the radar and making the layout design of the antenna more flexible.

[0069] In the embodiments of the present application, by adjusting the distance between the main branch antenna 1 and the sub-branch antenna 2, the detection field of view of the automotive radar and the maximum gain direction of the antenna dual-peak pattern can be adjusted; specifically, the smaller the distance between the main branch antenna 1 and the sub-branch antenna 2, the larger the angle between the maximum gain direction of the antenna dual-peak pattern and the 0° detection axis.

[0070] In some embodiments, in the beam emitted by the main branch antenna 1 and the sub-branch antenna 2 in the maximum gain direction, the beam width at -3dB to 3dB is greater than or equal to 60°, and the distance between the main branch antenna 1 and the sub-branch antenna 2 is 0.45 times the wavelength of the electromagnetic wave; see the attached Figure 2 As shown in the figure, the figure shows the antenna dual-peak pattern of the vehicle-mounted dual-peak antenna assembly under the above conditions, where the horizontal axis is the detection angle and the vertical axis is the gain magnitude; it can be seen that based on the vehicle-mounted dual-peak assembly of the present application, the maximum gain direction in the antenna dual-peak pattern of the vehicle-mounted dual-peak assembly is exactly 45° or -45° relative to the 0° detection axis, so that the best detection directions of the automotive radar are located directly behind and directly to the side of the vehicle, ensuring that the automotive radar has good field of view and detection accuracy.

[0071] A vehicle-mounted dual-peak antenna assembly provided by the embodiments of the present application has the following beneficial effects:

[0072] 1. A vehicle-mounted dual-peak antenna assembly provided by the present application uses a main branch antenna and a sub-branch antenna, and sets the feed amplitude ratio of the main branch antenna and the sub-branch antenna to 1:0.05 - 1:0.35, so that when the vehicle is directly behind and directly to the side, the farthest detection distance can be achieved, while avoiding detection blind spots of the vehicle radar and improving the detection performance of the vehicle radar system.

[0073] 2. A vehicle-mounted dual-peak antenna assembly provided by the present application adjusts the antenna parameters of the main branch antenna and the sub-branch antenna to make the antenna directions of the main branch antenna and the sub-branch antenna Figure 1 consistent, so that the antenna dual-peak pattern of the vehicle-mounted dual-peak antenna assembly has symmetry, reducing the direction limitation during the installation of the vehicle radar, improving the radar installation flexibility, and reducing the operation difficulty.

[0074] 3. A vehicle-mounted dual-peak antenna assembly provided by the present application has a distance between the main branch antenna and the sub-branch antenna of 0.3 - 0.5 times the wavelength of the electromagnetic wave, ensuring a good field of view for the vehicle radar. After the vehicle radar is installed, it ensures that the maximum gain direction of the antenna pattern of the antenna assembly is at a 45° direction, and thus can ensure that the best detection area of the radar is directly behind and directly to the side of the vehicle.

[0075] The following combines the specification appendix Figure 4 , and introduces a method for obtaining preparation values of a vehicle-mounted dual-peak antenna assembly provided by an embodiment of the present application, which is applied to the preparation of the vehicle-mounted dual-peak antenna assembly; the vehicle-mounted dual-peak antenna assembly includes a main branch antenna and a sub-branch antenna, and the method includes:

[0076] S1. Obtain antenna array parameters, vehicle radar detection parameters, and installation angles; the antenna array parameters include the spatial dimension parameters of the array space in the vehicle radar for accommodating the antenna assembly and the number of components of the vehicle-mounted dual-peak antenna assembly.

[0077] In the embodiment of the present application, it should be noted that the vehicle-mounted dual-peak antenna assembly is installed in the vehicle radar, and the vehicle radar can be a vehicle corner radar installed at the rear edge of the vehicle tail to detect target information in the left and right directions and the rear of the vehicle. The antenna array parameters include the spatial dimension parameters of the array space in the vehicle radar for accommodating the antenna and the number of components of the vehicle-mounted dual-peak antenna assembly, etc.; the vehicle radar detection parameters include, but are not limited to, the vehicle radar detection range, the vehicle radar detection distance, and the vehicle detection accuracy; the installation angle refers to the angle of the vehicle radar installation axis relative to the vehicle body; by changing the detection range of the vehicle-mounted dual-peak antenna assembly, different requirements of the vehicle radar for the detection range can be met; by changing the maximum gain direction of the vehicle-mounted dual-peak antenna assembly, the farthest detection distance in the same direction can be maintained under different installation angles of the vehicle radar.

[0078] S2. Perform preset screening according to the spatial dimension parameters and the number of components to obtain the array element size.

[0079] S3. Calculate the antenna width according to the array element size to obtain the antenna width.

[0080] In the embodiment of the present application, a vehicle dual-peak antenna assembly is an array element, and multiple vehicle dual-peak assemblies can be installed in the automotive radar, that is, the automotive radar contains multiple array elements; it can be assumed that the array element size is n times half a wavelength, and multiple array modes can be obtained under different array element sizes. The array directional diagrams of different array modes correspond to different array reference functions, and different array reference function values ​​corresponding to different array modes can be obtained. The size of the array reference function value represents the quality of the array. All array reference function values ​​are compared to screen out the optimal array element size; specifically, the optimal array element size is less than or equal to 2 times half a wavelength. The size of a single array element corresponds to the size of a vehicle dual-peak assembly. A single vehicle dual-peak assembly includes a main branch antenna 1 and a secondary branch antenna 2 with a set of the same antenna parameters. The antenna widths of the main branch antenna 1 and the secondary branch antenna 2 can be calculated according to the array element size. Specifically, the sum of the antenna widths of the main branch antenna 1 and the secondary branch antenna 2 is less than 2 times half a wavelength.

[0081] S4. According to the detection parameters and installation angle of the automobile radar and based on the symmetry of the radiation pattern, a normalized calculation is performed on the antenna gain to obtain the antenna gain in each direction of the double-peak radiation pattern of the target antenna.

[0082] In a specific embodiment, the direction of the farthest detection distance of the car is set to the rear and side of the car body; assuming that the antenna gain in the detection direction of the farthest detection distance is 0 db, the following formula is used for normalization calculation:

[0083] G=20*log(L1 / L2)

[0084] Among them, G is the antenna gain in the target detection direction, L1 is the farthest detection distance, and L2 is the detection distance in the target direction. Through the above formula, the antenna gain value of the antenna component in each detection direction can be calculated with the antenna gain value of the detection direction with the farthest detection distance as the reference value.

[0085] S5. Based on the antenna width and the antenna gain in each direction, draw the corresponding target double-peak radiation pattern; the target double-peak radiation pattern has radiation pattern symmetry.

[0086] In the embodiment of the present application, after obtaining the antenna width parameter and the antenna gain, a set of discrete antenna gain points can be drawn to obtain the target double-peak radiation pattern.

[0087] In some embodiments, please refer to Figure 4, the automotive radar can be a corner radar installed at the rear edge of the vehicle's tail. The target detection field of view of the automotive radar is 180°. If the installation axis of the automotive radar is set as the 0° detection axis, the detection angle range of the vehicle-mounted dual-peak component is -90° to 90°; by setting the angle between the installation axis of the automotive radar and the vehicle body to 135°, and setting the maximum gain directions of the vehicle-mounted dual-peak antenna component to 45° and -45° directions, it can make the detection directions of the farthest detection distance of the antenna component be directly behind and directly to the side of the vehicle body, thus achieving the best detection field of view. Based on the above formula, assuming that the antenna gain at the detection directions (45° and -45°) of the maximum detection distance is 0 dB, the antenna gains at each direction point as shown in Table 1 below can be obtained, that is, a corresponding set of discrete antenna gain points can be plotted, and then the target dual-peak direction pattern can be obtained.

[0088] Table 1

[0089]

[0090]

[0091] S6. Based on the target dual-peak direction pattern, determine the final values of the feed amplitude ratio, feed phase difference, beam width, and antenna spacing of the vehicle-mounted dual-peak antenna component to be prepared.

[0092] In the embodiment of the present application, S6 may include:

[0093] S61. Obtain a sample data set, which includes multiple reference feed amplitude ratios, reference phase differences, reference beam widths, and reference antenna spacings.

[0094] S62. Obtain the reference dual-peak direction patterns corresponding to the multiple reference feed amplitude ratios, reference phase differences, reference beam widths, and reference antenna spacings.

[0095] S63. Based on the similarity comparison result between the reference dual-peak direction pattern and the target dual-peak direction pattern, screen out the initial values of the feed amplitude ratio, feed phase difference, beam width, and antenna spacing of the target dual-peak direction pattern from the multiple reference feed amplitude ratios, reference phase differences, reference beam widths, and reference antenna spacings.

[0096] In the embodiments of the present application, multiple groups of reference feed amplitude ratios, reference feed phase differences, reference beam widths, and reference antenna spacings are randomly preset. For example, 1000 groups can be preset to form a sample data set. Through a preset simulation method, simulation calculations are performed on the preset multiple groups of reference feed amplitude ratios, reference feed phase differences, reference beam widths, and reference antenna spacings to obtain multiple groups of reference double-peak patterns. The similarity between the reference double-peak patterns and the target double-peak pattern is selected to determine at least one target reference double-peak pattern with a similarity greater than a preset threshold from the multiple groups of reference double-peak patterns, and the feed amplitude ratio, feed phase difference, beam width, and antenna spacing corresponding to the target reference double-peak pattern are determined as the initial values of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing.

[0097] S64. Construct a double-peak antenna assembly model according to the initial values of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing.

[0098] Using the preset simulation method, simulation processing is performed on the initial values of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing to obtain the corresponding double-peak antenna assembly model.

[0099] S65. Obtain update values corresponding to at least one of the initial values of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing, and perform corresponding update processing.

[0100] In the embodiments of the present application, the difference between the update value and the initial value of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, or the initial value of the antenna spacing before the update is within a preset error fluctuation range. After obtaining the update value, the original value is replaced. For example, if the update value corresponding to the initial value of the feed amplitude ratio and the update value corresponding to the initial value of the feed phase difference are obtained, the initial value of the feed amplitude ratio and the initial value of the feed phase difference are respectively replaced with the corresponding update values. Specifically, any one of the initial values of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, or the initial value of the antenna spacing can be updated; or multiple of the initial values of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, or the initial value of the antenna spacing can be updated.

[0101] S66. Based on the updated initial values of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing, simulate the operation of the vehicle-mounted double-peak antenna assembly model to obtain a simulated double-peak pattern.

[0102] In the embodiments of the present application, based on different initial values of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing, simulating the operation of the vehicle-mounted double-peak antenna assembly model can obtain simulated double-peak patterns with different results.

[0103] In the embodiments of the present application, refer to the accompanying drawings of the specification Figures 6-9 , by updating the feed amplitude ratio, the detection distance of the vehicle-mounted dual-peak component near the 0° detection axis can be changed, and then the antenna gain magnitude and the antenna gain slope magnitude within a preset angle range near 0° on the dual-peak antenna pattern can be changed; by updating the feed phase difference, the farthest detection distance direction and the maximum detection range of the vehicle-mounted dual-peak antenna component can be changed, and then the maximum gain angle and the detection range angle of the dual-peak antenna pattern can be changed; by updating the beam width of a single branch antenna, the farthest detection distance direction and the farthest detection distance of the vehicle-mounted dual-peak component can be changed, and then the maximum gain position angle and the maximum gain value of the dual-peak antenna pattern and the antenna gain slope of the antenna pattern in a certain detection interval can be changed; by updating the antenna spacing between the two antennas, the farthest detection distance direction and the farthest detection distance of the vehicle-mounted dual-peak antenna component can be changed, and then the maximum gain position angle, the maximum gain value of the dual-peak antenna pattern, the detection range of the antenna pattern, and the antenna gain slope of the antenna pattern in the target detection interval can be changed.

[0104] S67. When the similarity between the simulated dual-peak pattern and the target dual-peak pattern meets the preset conditions, determine the feed amplitude ratio value, the feed phase difference value, the beam width value, and the antenna spacing value corresponding to the simulated dual-peak pattern as the final feed amplitude ratio value, the final feed phase difference value, the final beam width, and the final antenna spacing of the vehicle-mounted dual-peak antenna component to be prepared, respectively.

[0105] In the embodiments of the present application, the similarity meeting the preset conditions can specifically be: the differences between the maximum gain position, the detection field of view angle range, the maximum gain value, the zero depth, and other parameters of the simulated dual-peak pattern and the target dual-peak pattern are all within the preset range; the preset range is determined based on the allowable error range of the above parameters.

[0106] S68. When the simulated dual-peak pattern and the target dual-peak pattern are not within the preset error range, repeat steps S65 - S67 until the preset conditions are met.

[0107] Through the method for determining the preparation parameters of the vehicle-mounted dual-peak antenna component provided by the embodiments of the present application, the feed amplitude ratio value, the feed phase difference value, the beam width value, and the antenna spacing value of the vehicle-mounted dual-peak antenna component can be obtained.

[0108] Specifically, the feed amplitude ratio between the feed amplitude of the main branch antenna and the feed amplitude of the sub-branch antenna is 1:0.05 to 1:0.35; the feed phase difference between the feed phase of the main branch antenna 1 and the feed phase of the sub-branch antenna 2 is 90 to 270°; in the beam emitted by the main branch antenna 1 and the sub-branch antenna 2 in the maximum gain direction, the beam width at -3db to 3db is greater than or equal to 60°; the spacing between the main branch antenna 1 and the sub-branch antenna 2 is 0.3 to 0.5 times the wavelength of the electromagnetic wave.

[0109] In addition, an embodiment of the present application further provides an automotive radar, and the automotive radar includes at least one vehicle-mounted bimodal antenna assembly in the embodiment of the present application.

[0110] In addition, an embodiment of the present application further provides a vehicle, and the vehicle includes the automotive radar in the embodiment of the present application.

[0111] The above description has fully disclosed the specific implementation manners of the present application. It should be noted that any modifications made by those skilled in the art to the specific implementation manners of the present application do not depart from the scope of the claims of the present application. Accordingly, the scope of the claims of the present application is not limited solely to the foregoing specific implementation manners.

Claims

1. A method for determining preparation parameters of a vehicle-mounted bimodal antenna assembly, characterized in that, Applied to the preparation of a vehicle-mounted dual-peak antenna assembly; the vehicle-mounted dual-peak antenna assembly includes a main branch antenna and a sub-branch antenna, and the method includes: Obtain antenna array parameters, automotive radar detection parameters, and installation angles; the antenna array parameters include the spatial dimension parameters of the array space for accommodating the antenna assembly in the automotive radar and the number of components of the vehicle-mounted dual-peak antenna assembly; Perform a preset screening based on the spatial dimension parameters and the number of components to obtain the element size; Calculate the antenna width based on the element size to obtain the antenna width; Based on the automotive radar detection parameters and the installation angle, and based on the symmetry of the radiation pattern, perform normalization calculation for the antenna gain to obtain the antenna gain in each direction of the antenna dual-peak radiation pattern; Based on the antenna width and the antenna gain in each direction, draw the corresponding target dual-peak radiation pattern; the target dual-peak radiation pattern has radiation pattern symmetry; Based on the target dual-peak radiation pattern, determine the final value of the feed amplitude ratio, the final value of the feed phase difference, the final value of the beam width, and the final value of the antenna spacing of the vehicle-mounted dual-peak antenna assembly to be prepared; The determining the final value of the feed amplitude ratio, the final value of the feed phase difference, the final value of the beam width, and the final value of the antenna spacing of the vehicle-mounted dual-peak antenna assembly to be prepared based on the target dual-peak radiation pattern includes: Obtain a sample data set, which includes a plurality of reference feed amplitude ratios, reference phase differences, reference beam widths, and reference antenna spacings; Obtain the reference dual-peak radiation patterns corresponding to the plurality of reference feed amplitude ratios, reference phase differences, reference beam widths, and reference antenna spacings; Based on the similarity comparison result between the reference dual-peak radiation pattern and the target dual-peak radiation pattern, screen out the initial value of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing of the target dual-peak radiation pattern from the plurality of reference feed amplitude ratios, reference phase differences, reference beam widths, and reference antenna spacings; Construct a dual-peak antenna assembly model according to the initial value of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing; Obtain the update value corresponding to at least one of the initial value of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing, and perform the corresponding update process; Based on the updated initial value of the feed amplitude ratio, the initial value of the feed phase difference, the initial value of the beam width, and the initial value of the antenna spacing, simulate the operation of the vehicle-mounted dual-peak antenna assembly model to obtain a simulated dual-peak radiation pattern; When the similarity between the simulated dual-peak radiation pattern and the target dual-peak radiation pattern meets the preset condition, determine the feed amplitude ratio value, the feed phase difference, the beam width value, and the antenna spacing value corresponding to the simulated dual-peak radiation pattern as the final value of the feed amplitude ratio, the final value of the feed phase difference, the final value of the beam width, and the final value of the antenna spacing of the vehicle-mounted dual-peak antenna assembly to be prepared, respectively.

2. A vehicle-mounted dual-peak antenna assembly, characterized in that, Prepare according to the method for determining the preparation parameters of the vehicle-mounted dual-peak antenna assembly in claim 1; the vehicle-mounted dual-peak antenna assembly includes a main branch antenna (1) and a sub-branch antenna (2), the main branch antenna (1) and the sub-branch antenna (2) are arranged at intervals and are electrically connected; The feed amplitude ratio between the feed amplitude of the main branch antenna (1) and the feed amplitude of the sub-branch antenna (2) is 1:0.05 to 1:0.35; The feed phase difference between the feed phase of the main branch antenna (1) and the feed phase of the sub-branch antenna (2) is 90 to 270°; 3. The vehicle-mounted bimodal antenna assembly according to claim 2, characterized in that When the main branch antenna (1) and the sub-branch antenna (2) are respectively fed with the same feed current alone, the difference between the relative field strengths of the radiation fields of the main branch antenna (1) and the sub-branch antenna (2) in the same direction is within a preset error range; 4. The vehicle-mounted bimodal antenna assembly according to claim 3, characterized in that, When the main branch antenna (1) and the sub-branch antenna (2) are respectively fed with the same feed current alone, the maximum gain directions of the main branch antenna (1) and the sub-branch antenna (2) are between -10° and 10°, and the 3dB beam width is greater than or equal to 20°; 5. The vehicle-mounted dual-peak antenna assembly according to claim 4, wherein, When the main branch antenna (1) and the sub-branch antenna (2) are respectively fed with the same feed current alone, the maximum gain directions of the main branch antenna (1) and the sub-branch antenna (2) are between -10° and 10°, and the 3dB beam width is greater than or equal to 40°; 6. The vehicle-mounted bimodal antenna assembly according to claim 3, wherein, When the main branch antenna (1) and the sub-branch antenna (2) are respectively fed with the same feed current alone, the maximum gain directions of the main branch antenna (1) and the sub-branch antenna (2) are between -10° and 10°, and the 3dB beam width is greater than or equal to 60°; 7. The vehicle-mounted bimodal antenna assembly according to claim 3, characterized in that, When the main branch antenna (1) and the sub-branch antenna (2) are respectively fed with the same feed current alone, the maximum gain directions of the main branch antenna (1) and the sub-branch antenna (2) are between -2° and 2°, and the 3dB beam width is greater than or equal to 60°; 8. The vehicle-mounted bimodal antenna assembly according to claim 3, wherein, The main branch antenna (1) and the sub-branch antenna (2) can transmit electromagnetic waves with the same wavelength; The distance between the main branch antenna (1) and the sub-branch antenna (2) is 0.3 to 0.5 times the wavelength of the electromagnetic wave; 9. The vehicle-mounted bimodal antenna assembly according to claim 8, wherein The feed amplitude ratio between the feed amplitude of the main branch antenna (1) and the feed amplitude of the sub-branch antenna (2) is 1:0.08 to 1:0.3; The feed phase difference between the feed phase of the main branch antenna (1) and the feed phase of the sub-branch antenna (2) is 170 to 190°; The distance between the main branch antenna (1) and the sub-branch antenna (2) is 0.41 to 0.5 times the wavelength of the electromagnetic wave; 10. An automotive radar, characterized in that, Comprising at least one vehicle-mounted dual-peak antenna assembly according to any one of claims 2-9; 11. A vehicle, characterized in that, An automotive radar including claim 10;

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