Low-scattering processing method and device for rigid support rotary table

Abstract

The invention relates to the technical field of electromagnetic scattering, in particular to a low-scattering processing method and device for a rigid support rotary table. The embodiment of the invention provides a low-scattering processing method for a rigid support rotary table, and the method comprises the steps: carrying out the electromagnetic scattering test of a target disposed on the rigid support rotary table, and obtaining test data; performing one-dimensional / two-dimensional imaging processing on the test data at different angles to obtain strong scattering point distribution data; judging a target position where the strong scattering point data is generated according to an electromagnetic wave propagation path and a target erection height; and arranging a shielding device under the target position to reduce the influence of ground scattering on test data. The embodiment of the invention provides a low-scattering processing method and device for a rigid support rotary table. The influence of ground reflection on measurement data can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic scattering, and in particular to a low scattering processing method and device for a rigid support turntable. Background Art

[0002] With the research of various electromagnetic scattering projects, the demand for electromagnetic scattering characteristic measurement in outdoor natural environment is increasing. At the same time, it is inevitable to encounter measurement situations with ground reflection, and the target measurement data is greatly affected at this time. The relative calibration method is often used for electromagnetic scattering characteristic measurement, that is, the standard body and the target to be measured are measured, and the target measurement value is calibrated by calculating the measured value and theoretical value of the standard body, and finally the electromagnetic scattering characteristics of the target are obtained. Since the horizontal cross-section of the physical size of the general calibration body is relatively small, the multiple reflection energy between it and the ground is small and has a certain time delay. Therefore, the ground clutter has little effect on the measurement of the standard body. Under the same circumstances, the large-size target has a larger horizontal cross-sectional area, and the reflection energy between it and the ground is larger, and its time delay coincides with the target body within a certain angular domain. Summary of the invention

[0003] The embodiment of the present invention provides a low scattering processing method and device for a rigid support turntable, which can reduce the influence of ground reflection on measurement data.

[0004] In a first aspect, an embodiment of the present invention provides a low scattering processing method for a rigid support turntable, comprising:

[0005] Conduct electromagnetic scattering test on the target mounted on the rigid support turntable to obtain test data;

[0006] Performing one-dimensional / two-dimensional imaging processing at different angles on the test data to obtain strong scattering point distribution data;

[0007] Determine the target position where the strong scattering point data is generated according to the electromagnetic wave propagation path and the target installation height;

[0008] A shielding device is arranged under the target position to reduce the influence of ground scattering on the test data.

[0009] In a possible design, before setting a shielding device under the target position to reduce the influence of ground scattering on the test data, the method further includes:

[0010] A shielding body is prepared; wherein the upper surface of the shielding body facing the target is convex upward to reflect the electromagnetic waves emitted by the target to both sides thereof.

[0011] In a possible design, the horizontal projection of the shielding body is symmetrical along the electromagnetic wave emission direction, and the side facing the electromagnetic wave emission direction is a sharp angle.

[0012] In a possible design, the material of the shielding body includes metal.

[0013] In a possible design, a lower surface of the shielding body facing away from the test object is provided with universal wheels that can be raised and lowered.

[0014] In a possible design, the shielding body is provided with a through hole, and the through hole is used to penetrate the rigid support turntable.

[0015] In a possible design, after preparing the shielding body, the method further includes:

[0016] A wave absorbing layer is arranged on the upper surface of the lock shielding body, and the wave absorbing layer includes a plurality of upward scattering layers.

[0017] In a second aspect, an embodiment of the present invention further provides a low scattering processing device for a rigid support turntable, which is used to implement any of the above methods in China, and the device includes:

[0018] An electromagnetic wave transceiver, used for transmitting and receiving electromagnetic waves to perform a two-dimensional imaging test to obtain test data;

[0019] Arranging a shielding device under the target position to reduce the influence of ground scattering on the test data;

[0020] A data processing device, used for performing two-dimensional imaging processing at different angles on the test data to obtain strong scattering point data, and for determining the target position where the strong scattering point data is generated according to the electromagnetic wave propagation path and the target installation height;

[0021] A shielding device is arranged under the target position to reduce the influence of ground scattering on the test data.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] In this embodiment, the target position of the strong scattering point that affects the test result can be obtained through testing and data processing. The strong scattering point is generated by ground reflection. Therefore, a shielding device is set at the corresponding position below the target position to reduce strong scattering. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1This is a target schematic diagram at an azimuth angle of 0° provided by the present invention;

[0026] Figure 2 This is a target schematic diagram at an azimuth angle of 90° provided by the present invention;

[0027] Figure 3 It is a schematic diagram of a transmission path of a 0° electromagnetic wave between a target and the ground and its one-dimensional distance image provided by the present invention;

[0028] Figure 4 It is a schematic diagram of a 90° electromagnetic wave transmission path between a target and the ground and its one-dimensional distance image provided by the present invention;

[0029] Figure 5 This is a schematic diagram of electromagnetic wave input and reflection changing with angle under a cement floor condition provided by the present invention;

[0030] Figure 6 This is a schematic diagram of a use scenario of a shielding subject provided by the present invention;

[0031] Figure 7 It is a structural schematic diagram of a wave absorbing material provided by the present invention;

[0032] Figure 8 It is a comparison diagram of the change of the image scattering intensity of a wave absorbing material and a certain ground object with the incident angle provided by the present invention;

[0033] Fig. 9 This is a schematic diagram of a shielding main body structure provided by the present invention;

[0034] Fig.10 It is a schematic diagram of a usage scenario of a shielding device provided by the present invention.

[0035] In the figure:

[0036] 1- Target;

[0037] 2- Rigid support turntable;

[0038] 3- shield the subject;

[0039] 4- Absorbing material. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present invention are described at the angles shown in the drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0043] As mentioned above, taking a simple target and its one-dimensional range image as an example, combined with Figure 1-2 It can be seen that when the electromagnetic wave irradiates the target from the left side of the picture, at an azimuth angle of 0°, its radial dimension in the electromagnetic wave propagation path is shorter and smaller than the target installation height. Figure 3 The one-dimensional distance in the figure below can reflect the main transmission path of electromagnetic waves, that is: target head to leading edge - target body - tail - ground background reflection clutter. In the current case, the separation of target and background clutter can be achieved through the time domain gate. When its azimuth angle is 90°, its lateral size is larger and its radial size is greater than the installation height. At this time, the electromagnetic wave transmission path is analyzed, that is: right leading edge - target body - ground background reflection clutter - left side of the target, then the ground clutter appears in the target area ( Figure 4 The third peak is obvious in the figure below). At the same time, ground clutter changes with the target azimuth, and processing methods such as time domain gate and zero Doppler filtering cannot effectively suppress it.

[0044] In summary, it can be seen that suppressing the multipath reflection of electromagnetic waves on the ground plays a key role in the accurate measurement of targets. For the surface of complex targets, the diffuse reflection of electromagnetic waves is complex and time-varying, which causes the ground clutter to be complex and time-varying, and then causes deviations in the measurement data processing of the target to be measured. Therefore, it is necessary to analyze the scattering mechanism from the ground where the target is set up and suppress the influence of the ground background. Generally, if the background of electromagnetic scattering characteristics measurement is 20dB lower than that of the target, the background has less than 1dB of influence on the target electromagnetic scattering characteristics value. Therefore, under the above background, the key is to analyze and suppress the ground background clutter.

[0045] Therefore, how to create a low scattering area for the target becomes a big problem. To solve this problem, we should start from the actual transmission path of electromagnetic waves and combine Figure 3 , 4 , 5. It can be seen that when electromagnetic waves from free space or reflected by a target body illuminate the ground at a small angle, their path is similar to mirror reflection and has little effect on the test. Therefore, the path that has a greater impact on the target electromagnetic measurement is the reflection from the lower surface of the target, which is reflected twice by the ground to the target and finally reflected again by the target to the receiving antenna.

[0046] In order to solve the above problems, an embodiment of the present invention provides a low scattering processing method for a rigid support turntable, comprising:

[0047] Conduct electromagnetic scattering test on the target mounted on the rigid support turntable to obtain test data;

[0048] Perform one-dimensional / two-dimensional imaging processing at different angles on the test data to obtain strong scattering point data;

[0049] Determine the target location where the strong scattering point data is generated based on the electromagnetic wave propagation path and the target installation height;

[0050] A shielding device is set up under the target position to reduce the impact of ground scattering on the test data.

[0051] In this embodiment, the target position of the strong scattering point that affects the test result can be obtained through testing and data processing. The strong scattering point is generated by ground reflection. Therefore, a shielding device is set at the corresponding position below the target position to reduce strong scattering.

[0052] Please refer to Fig. 9 In some embodiments of the present invention, before setting a shielding device under the target position to reduce the influence of ground scattering on the test data, the method further includes:

[0053] A shielding body is prepared, wherein the upper surface of the shielding body facing the target is convex upward to reflect the electromagnetic waves emitted by the target to both sides thereof.

[0054] Combination Figure 5 The flat cement floor has a reflective property similar to that of a metal plate, which can be shielded by design. Figure 6 ), direct the ground reflected wave to both sides of the test direction, so that the ground clutter is concentrated on both sides of the test path and cannot return to the receiving antenna, thus achieving a low scattering background environment.

[0055] In some embodiments of the present invention, the horizontal projection of the shielding body is symmetrical along the electromagnetic wave emission direction, and the side facing the electromagnetic wave emission direction is a sharp angle.

[0056] In some embodiments of the present invention, the material of the shielding body includes metal.

[0057] In some embodiments of the present invention, a lower surface of the shielding body facing away from the test target is provided with universal wheels that can be raised and lowered.

[0058] In some embodiments of the present invention, the shielding body is provided with a through hole, and the through hole is used to penetrate the rigid support turntable.

[0059] Please refer to Fig.10 In some embodiments of the present invention, after preparing the shielding body, the method further includes:

[0060] A wave absorbing layer is arranged on the upper surface of the shielded main body, and the wave absorbing layer comprises a plurality of upward pointed cone-shaped wave absorbing materials.

[0061] Combined with the actual surface flatness and splicing process of the shielding body, it may still lead to a strong scattering source. The surface is covered with absorbing materials to suppress the reflection of the flat plate and its actual surface defects. Figure 7 , Figure 8 It can be seen that the absorbing material can greatly absorb electromagnetic waves around the vertical incidence direction. Although the absorbing performance decreases under oblique incidence, the scattering characteristics of the metal plate can effectively deflect the reflection of electromagnetic waves, thereby ensuring the low scattering characteristics of the metal shielding device at multiple angles.

[0062] The embodiment of the present invention further provides a low scattering processing device for a rigid support turntable, which is used to implement any of the above methods, and the device includes:

[0063] An electromagnetic wave transceiver, used for transmitting and receiving electromagnetic waves to perform one-dimensional / two-dimensional imaging tests to obtain test data;

[0064] A shielding device is set up under the target position to reduce the impact of ground scattering on the test data;

[0065] A data processing device, used for performing one-dimensional / two-dimensional imaging processing at different angles on the test data to obtain strong scattering point data, and for determining the target position where the strong scattering point data is generated according to the electromagnetic wave propagation path and the target installation height;

[0066] A shielding device is arranged under the target position to reduce the influence of ground scattering on the test data.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low scattering processing method for a rigid support turntable, characterized in that: include: Conduct electromagnetic scattering test on the target mounted on the rigid support turntable to obtain test data; Performing one-dimensional / two-dimensional imaging processing at different angles on the test data to obtain strong scattering point data; Determine the target position where the strong scattering point data is generated according to the electromagnetic wave propagation path and the target installation height; A shielding device is arranged under the target position to reduce the influence of ground scattering on the test data.

2. The method according to claim 1, characterized in that Before setting a shielding device under the target position to reduce the influence of ground scattering on the test data, the method further includes: A shielding body is prepared; wherein the upper surface of the shielding body facing the target is convex upward to reflect the electromagnetic waves emitted by the target to both sides thereof.

3. The method according to claim 2, characterized in that The horizontal projection of the shielding body is symmetrical along the electromagnetic wave emission direction, and the side facing the electromagnetic wave emission direction is a sharp angle.

4. The method according to claim 2, characterized in that: The shielding body is made of a material including metal.

5. The method according to claim 2, characterized in that: The lower surface of the shielding body facing away from the test object is provided with universal wheels that can be raised and lowered.

6. The method according to claim 2, characterized in that The shielding body is provided with a through hole, and the through hole is used to penetrate the rigid support turntable.

7. The method according to claim 2, characterized in that After the shielding body is prepared, the method further comprises: A wave absorbing layer is arranged on the upper surface of the shielded main body, and the wave absorbing layer comprises a plurality of upward pointed cone-shaped wave absorbing materials.

8. A low scattering processing device for a rigid support turntable, characterized in that: For implementing the method described in any one of claims 1 to 7, the device comprises: An electromagnetic wave transceiver, used for transmitting and receiving electromagnetic waves to perform electromagnetic scattering tests to obtain test data; Arranging a shielding device under the target position to reduce the influence of ground scattering on the test data; A data processing device, used for performing one-dimensional / two-dimensional imaging processing at different angles on the test data to obtain strong scattering point distribution data, and for determining the target position where the strong scattering point data is generated according to the electromagnetic wave propagation path and the target installation height; A shielding device is arranged under the target position to reduce the influence of ground scattering on the test data.

Images