Distance confirmation method and device and radiation disturbance test device

Abstract

The invention discloses a distance confirmation method, which can be used for confirming a test distance in a radiation disturbance test, and comprises the following steps of: projecting a circular light area on a support table by using a projection lamp; placing an object to be measured in the circular light area, and adjusting the position of the projection lamp to enable the boundary of the circular light area to coincide with the imaginary circumference of the object to be measured; the radius R of the circular light area is obtained, the test distance, namely, the distance L test between the antenna and the object to be tested, is obtained, and the horizontal distance L between the antenna and the projection lamp is equal to the sum of L test and R; and adjusting the distance to enable the horizontal distance between the antenna and the projection lamp to be L, thereby enabling the distance between the antenna and the object to be tested to meet the test distance. The invention further discloses a distance confirmation device and a radiation disturbance testing device. According to the distance confirmation method, the virtual circumference of the to-be-tested object in the radiation disturbance test is calibrated through the projection device, the confirmation efficiency of the test boundary is improved, the confirmation accuracy of the test distance in the radiation disturbance test is improved, and the efficiency of the radiation disturbance test is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radiation disturbance testing, and in particular to a distance confirmation method and device, and a radiation disturbance testing device. Background Art

[0002] When measuring 30MHz-1GHz radiated disturbance test items in an open test field or semi-anechoic chamber, the measurement should be performed at a determined test distance. The test distance is the distance between the point of the object under test closest to the antenna and the projection of the antenna's calibration reference point on the ground. In actual testing, since the object under test is usually composed of multiple components and cables, the object under test itself is not a planar point. According to the definition of GB / T 6113.203-2020 / CISPR 16-2-3:2016 standard: The horizontal projection distance between the boundary of the object under test and the antenna reference point on the ground plane is the test distance. Therefore, it is very important to determine the boundary of the object under test in the test. In the definition of the boundary in Appendix C C2.2.4 of the CISPR 32:2015 standard, it is mentioned that the measurement distance is the shortest horizontal distance between the imaginary circle and the antenna calibration point, where the imaginary circle is the boundary of the object under test.

[0003] In the prior art, for example, CN106646045A disclosed on May 10, 2017 is a system for high-frequency and low-frequency radiated interference testing in a 10-meter semi-anechoic chamber. This system directly uses the distance between the turntable and the antenna as the test distance, which is not implemented in accordance with the definition of GB / T 6113.203-2020 / CISPR 16-2-3:2016 standard, and there are errors in the test results. Summary of the invention

[0004] In order to overcome the defects in the prior art, the present invention provides a distance confirmation method, device and radiation interference testing device. The distance confirmation method calibrates the imaginary circumference of the object to be tested in the radiation interference test through a projection device, thereby speeding up the confirmation efficiency of the test boundary, improving the accuracy of the test distance confirmation in the radiation interference test, and improving the efficiency of the radiation interference test.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a distance confirmation method, which can be used to confirm the test distance in the radiation disturbance test, comprising the following steps:

[0006] Using a projection device to project a circular light area on the support table;

[0007] Placing the object to be tested in the circular light area, and adjusting the position of the projection device so that the boundary of the circular light area coincides with the imaginary circumference of the object to be tested;

[0008] Get the radius R of the circular light zone based on the test distance, i.e. the distance L between the antenna and the object to be tested.测 , calculate the distance L between the vertical projection of the calibration reference point of the antenna and the vertical projection of the light source point of the projection device to be equal to the test distance L 测 Add the radius R of the circular light area;

[0009] The distance is adjusted and the antenna is moved so that the horizontal distance between the vertical projection of the calibration reference point of the antenna and the vertical projection of the light source point of the projection device is L, so that the distance between the antenna and the object to be tested meets the test distance.

[0010] Among them, according to the definition of GB / T 6113.203-2020 / CISPR 16-2-3:2016 standard: the horizontal projection distance between the boundary of the object to be tested and the antenna reference point on the ground plane is the test distance. In the definition of the boundary in Appendix CC2.2.4 of the CISPR 32:2015 standard, it is mentioned that the measurement distance is the shortest horizontal distance between the imaginary circle and the antenna calibration point. Among them, the imaginary circle is the boundary of the object to be tested, and the imaginary circle is obtained by rotating the boundary farthest from the geometric center of the object to be tested around the geometric center of the object to be tested.

[0011] Furthermore, the center of the circular light area, the center of the support platform and the geometric center of the object to be measured coincide with each other.

[0012] Further, the step of obtaining the radius R of the circular light area includes:

[0013] The height H of the projection device from the support platform and the angle α between the line connecting the projection device and any point of the imaginary circular boundary and the vertical direction are obtained by a rangefinder and goniometer, and the radius R=H×tanα.

[0014] Further, setting the horizontal distance between the antenna and the projection device to L includes:

[0015] The ground is marked with a vertical projection point O of the projection device, and a scale line extends outward from the point O. The calibration reference point of the antenna is moved to the position marked as L on the scale line so that the horizontal distance between the antenna and the projection device is L.

[0016] A distance confirmation device can use the above distance confirmation method to confirm the test distance in the radiation disturbance test, characterized by comprising:

[0017] A support platform, the support platform is used to place the object to be measured;

[0018] A projection device is arranged above the support platform, and the projection device projects a circular light area on the support platform, wherein the circular light area coincides with an imaginary circumference of the object to be measured;

[0019] A lifting device, on which the projection device is fixed, is driven by the lifting device to move the projection device closer to or farther from the support platform.

[0020] Through the above technical solution, the lifting device is used to adjust the distance between the projection device and the support table surface, so as to adjust the size of the circular light area projected by the projection device, so that the circular light area and the imaginary circumference of the object to be tested coincide with each other. The imaginary circumference can be used to quickly confirm the test boundary of the object to be tested, which is convenient for subsequent re-radiation interference test to confirm the test distance.

[0021] Furthermore, the lifting device includes a lifting bracket, and the projection device is fixedly connected to the lifting bracket. As the lifting bracket is raised or lowered, the projection device approaches or moves away from the support platform, thereby adjusting the size of the circular light area.

[0022] Furthermore, a rangefinder goniometer is included, and the rangefinder goniometer is arranged at the lower end of the projection device, and is used to measure the radius of the circular light area. In the radiation disturbance test, the distance between the antenna and the object to be tested can be obtained by subtracting the radius of the circular light area from the distance between the antenna and the projection device. Because the radius can be easily obtained by the rangefinder goniometer, the distance between the antenna and the object to be tested can be easily obtained, and more accurately.

[0023] Furthermore, the lifting bracket includes a base, a lifting rod connected to the base, and a connecting rod connected to one end of the lifting rod away from the base, and the projection device is connected to the connecting rod. The lifting rod can be an electric lifting rod to achieve automatic adjustment of the test device.

[0024] Furthermore, the base is provided with universal wheels to facilitate the adjustment of the position of the projection device so that the circular light area projected by the projection device coincides with the imaginary circumference of the object to be measured.

[0025] Furthermore, the support platform includes a rotating support platform, which is convenient for adjusting the angle of the object under test in the radiation disturbance test.

[0026] A radiation disturbance test device, comprising:

[0027] A radio wave darkroom, wherein the radio wave darkroom is provided with a distance confirmation device according to any one of claims 1 to 5;

[0028] A test device is arranged in the anechoic chamber, and the test device comprises an antenna tower and an antenna arranged on the antenna tower;

[0029] A receiver is arranged outside the anechoic chamber, and the receiver is connected to the antenna;

[0030] The computer is arranged outside the anechoic chamber, and the computer is connected to the receiver.

[0031] Furthermore, the computer is configured with testing software for summarizing and displaying radiation disturbance test results.

[0032] Furthermore, universal wheels are provided at the bottom of the antenna tower to facilitate moving the antenna so that the distance between the antenna and the object to be tested meets the test distance L.

[0033] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0034] 1. The distance confirmation method disclosed in the present application uses a projection device to calibrate the imaginary circumference of the object to be tested in the radiation disturbance test, which speeds up the confirmation efficiency of the test boundary, improves the accuracy of the test distance confirmation in the radiation disturbance test, and improves the efficiency of the radiation disturbance test;

[0035] 2. The present application uses a rangefinder and goniometer to measure the radius of the circular light area projected by the projection device. In the radiation interference test, the test distance between the antenna and the object to be tested can be obtained by directly subtracting the radius of the circular light area from the distance between the antenna and the projection device.

[0036] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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 only 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.

[0038] Figure 1 is a schematic diagram of the overall structure of a radiated disturbance test device according to an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of the structure of a distance confirmation device in an embodiment of the present invention;

[0040] Figure 3 Schematic diagram of the projection point O and scale lines of the projection lamp on the ground in an embodiment of the present invention.

[0041] The figure marks of the above drawings are: 1. Radio wave darkroom; 2. Support platform; 21. Table; 22. Rotating axis; 3. Object to be tested; 4. Lifting bracket; 41. Base; 42. Electric lifting rod; 43. Connecting rod; 5. Projection lamp; 51. Circular light area; 52. Distance measuring and angle measuring instrument; 61. Antenna tower; 62. Test antenna; 63. Control motor; 7. Receiver; 8. Computer; 9. Point O; 10. Scale line. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0044] Combination Figure 1-3 As shown, this embodiment discloses a radiation disturbance test device, including:

[0045] Anechoic chamber 1, the anechoic chamber 1 is mainly used to simulate an open field, and is also a closed shielded chamber for measuring radiated radio disturbance and radiated sensitivity. The size of the anechoic chamber and the selection of RF absorbing materials are mainly determined by the layman size of the equipment under test (EUT) and the test requirements, and are divided into 1m method, 3m method or 10m method.

[0046] A support platform 2 is provided in the anechoic chamber 1, and the support platform 2 is used to place the object to be tested 3. The support 2 includes a table 21 and a rotating shaft 22 connected to the bottom of the table. When the object to be tested 3 is placed on the support platform 2, the geometric center of the object to be tested 3 coincides with the center of the table 21. The rotating shaft 22 can be driven by a motor to rotate the table, thereby adjusting the angle of the object to be tested 3 on the support platform 2 relative to the test antenna.

[0047] A lifting bracket 4 is provided in the anechoic chamber 1, and the lifting bracket 4 includes a base 41. A universal wheel is provided on the lower side of the base 41. An electric lifting rod 42 is connected to the upper side of the base 41. The electric lifting rod 42 is vertically arranged with the base. The end of the electric lifting rod 42 away from the base 41 is connected to a connecting rod 43.

[0048] The connecting rod 43 is connected with a projection lamp 5, and the projection lamp 5 is directly facing the table 21 of the support table 2, so that the projection lamp 5 projects a circular light area 51 on the table 21. The center of the circular light area 51 coincides with the center of the table 21. It can be understood that the size of the circular light area 51 projected by the projection lamp 5 on the table 21 depends on the distance between the projection lamp 5 and the table 2. The larger the distance between the projection lamp 5 and the table 2, the larger the radius R of the circular light area 51, and the smaller the distance between the projection lamp 5 and the table 2, the smaller the radius R of the circular light area 51.

[0049] Through the above technical solution, the distance between the projection lamp 5 and the table 2 can be adjusted as the electric lifting rod 42 is raised or lowered, thereby adjusting the radius R of the circular light area 51. By adjusting the position of the support platform 2 by the universal wheel, the position of the circular light area 51 projected by the projection lamp 5 on the table 21 changes accordingly. That is, by controlling the raising and lowering of the electric lifting rod 42 and the position of the support platform 2, the circular light area 51 projected by the projection lamp 5 on the table 21 can be made to coincide with the imaginary circumference of the object to be measured 3.

[0050] Among them, in the GB / T 6113.203-2020 / CISPR 16-2-3:2016 standard definition, the test distance L 测 It should be the distance between the point of the DUT closest to the antenna and the projection of the antenna calibration reference point on the ground. In actual testing, since the DUT is usually composed of multiple components and cables, the DUT itself is not a point on a plane, but forms an imaginary circle. The boundary of this imaginary circle is defined as the boundary of the DUT. According to the standard definition: The horizontal projection distance between the boundary of the DUT and the antenna calibration reference point on the ground plane is the test distance L 测 .

[0051] A rangefinder goniometer 52 is provided at the lower end of the projection lamp 5, and the rangefinder goniometer 52 is used to measure the angle α between the line connecting the projection lamp 5 and any point on the boundary of the circular light area 51 and the vertical direction, and the height H of the projection lamp 5 from the table 21. The radius R of the circular light area 51 projected by the projection lamp 5 on the table 21 is H×tanα.

[0052] An antenna tower 61 is provided in the anechoic chamber 1. A universal wheel is provided at the bottom of the antenna tower 61. The universal wheel is connected to a motor 63. The motor 63 can drive the universal wheel to rotate, thereby adjusting the position of the antenna tower 61. A test antenna 62 is provided on the antenna tower 61. Since the universal wheel is provided at the bottom of the antenna tower 61, the antenna tower 61 can be easily moved with the test antenna 62, thereby adjusting the distance between the test antenna 62 and the object under test 3.

[0053] The vertical projection point O 9 of the projection lamp 5 is marked on the ground in the anechoic chamber 1, and a scale line 10 extends outward from the O point 9. The antenna tower 61 is moved so that the calibration reference point of the test antenna 62 is located at the position marked as L on the scale line 10, that is, the horizontal distance between the test antenna 62 and the projection lamp 5 is L. Where L = L 测 +R.

[0054] Optionally, a distance measuring sensor may be provided on the antenna tower 61 at the same height as the projection lamp 5 , and the horizontal distance L between the test antenna 62 and the projection lamp 5 may be more conveniently confirmed by the distance measuring sensor.

[0055] Use the range sensor to confirm that the test antenna 62 and

[0056] The motor 63 is connected to a controller 64 for controlling the start and stop of the motor 63 . The controller 64 is arranged outside the anechoic chamber 1 to prevent electromagnetic waves generated by the controller 64 from affecting the test when it is working.

[0057] The test antenna 62 is connected to a receiver 7, which is arranged outside the anechoic chamber 1 to prevent the electromagnetic waves generated by the receiver 7 from affecting the test when it is working. The receiver 7 is used to select the required frequency components from the numerous electromagnetic waves in the air, suppress or filter out unnecessary signals or noise and interference signals, and then amplify and demodulate to obtain the original useful information.

[0058] The controller 64 and the receiver 7 are both connected to a computer 8, and the computer 8 is equipped with a test software for summarizing and displaying the radiation disturbance test results.

[0059] Optionally, a signal amplifier is connected between the test antenna 62 and the receiver 7 .

[0060] When using the above-mentioned radiation interference test device to test the anti-interference ability of the object under test 3, the object under test 3 is placed on the table 21, and the position and height of the projection lamp 5 are adjusted by the lifting bracket 4, so that the circular light area 51 projected by the projection lamp 5 on the table 21 coincides with the imaginary circumference of the object under test 3. At this time, the rangefinder goniometer 52 is used to measure the angle α between the line connecting the projection lamp 5 and any point on the boundary of the circular light area 51 and the vertical direction, as well as the height H of the projection lamp 5 from the table 21. Calculate the radius R = H × tanα of the circular light area 51 projected by the projection lamp 5 on the table 21. According to the test distance L 测 Adjust the position of the antenna tower 61 so that the distance L between the test antenna 62 and the projection lamp 5 satisfies L=L 测+R. By using the visible circular light area 51 instead of the invisible imaginary circle, the test distance L between the test antenna 62 and the object to be tested 3 can be easily determined. 测 The test distance L confirmed by this scheme 测 Accurate and effective, ensuring the accuracy of subsequent radiated disturbance tests.

[0061] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A distance confirmation method can be used to confirm the test distance in a radiation disturbance test, characterized in that: The following steps are involved: Using a projection device to project a circular light area on the support table; Placing the object to be tested in the circular light area, and adjusting the height of the projection device so that the boundary of the circular light area coincides with the imaginary circumference of the object to be tested; Get the radius R of the circular light zone based on the test distance, i.e. the distance L between the antenna and the object to be tested. 测 , calculate the distance L between the vertical projection of the calibration reference point of the antenna and the vertical projection of the light source point of the projection device to be equal to the test distance L 测 Add the radius R of the circular light area; The distance is adjusted and the antenna is moved so that the horizontal distance between the vertical projection of the calibration reference point of the antenna and the vertical projection of the light source point of the projection device is L, so that the distance between the antenna and the object to be tested meets the test distance.

2. The distance confirmation method according to claim 1, characterized in that: The step of obtaining the radius R of the circular light area comprises: The height H of the projection device from the support platform and the angle α between the line connecting the projection device and any point of the imaginary circular boundary and the vertical direction are obtained by a rangefinder and goniometer, and the radius R=H×tanα.

3. The distance confirmation method according to claim 2, characterized in that: Steps to adjust the distance include: The ground is marked with a vertical projection point O of the projection device, and a scale line extends outward from the point O. The calibration reference point of the antenna is moved to the position marked as L on the scale line so that the horizontal distance between the antenna and the projection device is L.

4. The distance confirmation method according to claim 1, characterized in that: The center of the circular light area, the center of the support platform and the geometric center of the object to be measured coincide with each other.

5. The distance confirmation method according to claim 1, characterized in that: The projection device is connected to a lifting bracket, and the step of adjusting the position of the projection device comprises: The lifting rod of the lifting bracket is adjusted in the vertical direction to change the distance between the projection device and the support platform, thereby adjusting the size of the circular light area projected by the projection device on the support platform.

6. A distance confirmation device, which can use the distance confirmation method described in any one of claims 1 to 5 to confirm the test distance in the radiation disturbance test, characterized in that: include: A support platform, the support platform is used to place the object to be measured; A projection device is arranged above the support platform, and the projection device projects a circular light area on the support platform, wherein the circular light area coincides with an imaginary circumference of the object to be measured; A lifting device, on which the projection device is fixed, and driven by the lifting device, the projection device approaches or moves away from the support platform; A rangefinder and goniometer is arranged at the lower end of the projection device and is used to measure the radius of the circular light area.

7. The distance confirmation device according to claim 6, characterized in that: The lifting device includes a lifting bracket, which includes a base, a lifting rod connected to the base, and a connecting rod connected to one end of the lifting rod away from the base. The projection device is connected to the connecting rod. As the lifting rod is raised or lowered, the projection device approaches or moves away from the support platform, thereby adjusting the size of the circular light area.

8. The distance confirmation device according to claim 6, characterized in that: The support platform includes a rotating support platform.

9. A radiation disturbance test device, characterized in that: include: A radio wave darkroom, wherein the radio wave darkroom is provided with a distance confirmation device according to any one of claims 7 to 8; A test device is arranged in the anechoic chamber, and the test device comprises an antenna tower and an antenna arranged on the antenna tower; A receiver is arranged outside the anechoic chamber, and the receiver is connected to the antenna; The computer is arranged outside the anechoic chamber and is connected to the receiver.

10. The radiated disturbance test device according to claim 9, characterized in that: The computer is configured with test software for summarizing and displaying radiation disturbance test results.

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