CN218499141U - Compact range testing system - Google Patents
Compact range testing system Download PDFInfo
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- CN218499141U CN218499141U CN202222318004.7U CN202222318004U CN218499141U CN 218499141 U CN218499141 U CN 218499141U CN 202222318004 U CN202222318004 U CN 202222318004U CN 218499141 U CN218499141 U CN 218499141U
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Abstract
The application discloses compact range test system includes test signal generating device, reflect meter and moving platform mechanism. The test signal generating device is used for sending a test signal with preset parameters to the reflecting device. The reflection device is used for reflecting the test signal so as to form a uniform plane wave test signal in a preset quiet area within the range of the reflection area. The mobile platform mechanism is used for arranging part of the phased array units in the phased array antenna in a quiet area in a mobile mode so as to test or calibrate the phased array units in the quiet area. Because partial phased array units in the phased array antenna can be calibrated in batches or in sequence, the compact range testing system can perform calibration in a dead zone area with very good performance, the occupied area of the compact range testing system can be reduced, and the calibration precision can be improved.
Description
Technical Field
The invention relates to the field of wireless testing, in particular to a compact range testing system.
Background
Before a wireless communication device enters the market, the wireless performance of the wireless communication device must be subjected to strict research and development and production tests, wherein the test speed and the test accuracy are important indexes which must be considered in the wireless test process.
In testing the wireless performance of a wireless communication device, the wireless device needs to be placed in a anechoic chamber to simulate a reflection-free electromagnetic environment. In the existing test system, the propagation characteristics of electromagnetic waves and the number of probes can be divided into a plurality of different test modes: far-field and near-field systems, single-probe and multi-probe test systems, non-reflection darkroom and reverberation room test systems, compact field test systems and the like, and test systems of different sizes and different methods can be adopted properly for different tested equipment and test frequency bands.
The compact range test system is based on the physical space electromagnetic wave shape transformation principle, spherical waves emitted by a test antenna are transformed into plane waves in a space with a distance lower than a far field through a reflecting surface or a medium convex lens, and electromagnetic wave signals radiated by a measuring probe are uniform signals when reaching a test area. The compact range test system may be used for amplitude phase calibration and testing of phased array antennas.
Disclosure of Invention
The invention mainly solves the technical problem that the compact range testing system in the prior art has technical defects.
According to a first aspect, there is provided in one embodiment a compact range testing system comprising a test signal generating device, a reflecting device, and a moving platform mechanism;
the test signal generating device is used for sending a test signal with preset parameters to the reflecting device;
the reflecting device is used for reflecting the test signal and forming a uniform plane wave test signal in a preset quiet zone area in the range of the reflecting zone;
the mobile platform mechanism is used for bearing the phased array antenna to be tested, and arranging part of phased array units in the phased array antenna in the static area in a moving mode so as to test or calibrate the phased array units of the phased array antenna arranged in the static area.
In one embodiment, the compact range testing system further comprises an anechoic chamber; the test signal generating device, the reflecting device and the mobile platform mechanism are arranged in the anechoic chamber; the anechoic chamber is used for providing a test environment for detecting the phased array antenna.
In one embodiment, the reflection device is disposed at the top of the anechoic chamber, and the moving platform mechanism is disposed at the bottom of the anechoic chamber.
In one embodiment, the reflection device includes a reflection surface and a reflection moving mechanism, the reflection moving mechanism is used for bearing the reflection surface and changing the spatial position of the quiet zone in the anechoic chamber in a moving manner; the reflection moving mechanism is also used for synchronously moving the test signal generating device so as to keep the relative spatial position between the test signal generating device and the reflection device constant.
In one embodiment, the compact range testing system further comprises a test instrument, which is respectively connected with the test signal generating device and the phased array antenna; the test meter is used for generating the test signal or for analyzing the test signal received by the phased array antenna.
In one embodiment, the test signal generating device comprises a dual-polarized measurement probe; the dual-polarized measuring probe is used for sending the test signal so as to realize dual-polarized amplitude-phase calibration of the phased array antenna.
In one embodiment, the test signal generating device comprises a single-polarization measuring probe and a probe rotating mechanism;
the single-polarization measuring probe is used for sending the test signal;
the probe rotating mechanism is used for bearing the single-polarization measuring probe and rotating the single-polarization measuring probe according to a preset probe rotating shaft so as to realize dual-polarization amplitude-phase calibration of the phased array antenna;
the probe rotating mechanism is also used for keeping the relative spatial position between the single-polarization measuring probe and the reflecting device constant through movement.
In one embodiment, the moving platform mechanism comprises a planar moving device for moving the phased array antenna in parallel on a predetermined plane.
In one embodiment, the moving platform mechanism comprises a lifting device for controlling the lifting of the phased array antenna.
In one embodiment, the moving platform mechanism comprises an axial rotating device; the axial rotating device is used for rotationally controlling the phased array unit of the phased array antenna in the static area according to a preset antenna rotating shaft so as to realize dual-polarized amplitude-phase calibration of the phased array antenna.
According to the compact range testing system of the embodiment, since partial phased array units in the phased array antenna can be calibrated in batches or in sequence, the compact range testing system can perform calibration in a dead zone area with very good performance, the occupied area of the compact range testing system can be reduced, and the calibration accuracy can be improved.
Drawings
FIG. 1 is a schematic diagram of a prior art phased array antenna;
FIG. 2 is a schematic diagram of a compact range testing system in one embodiment;
FIG. 3 is a schematic diagram of another embodiment of a compact range testing system.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments have been given like element numbers associated therewith. In the following description, numerous specific details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the description of the methods may be transposed or transposed in order, as will be apparent to a person skilled in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Due to the natural technical advantages of the phased array antenna, the application field of the phased array antenna is rapidly developed along with the reduction of the development cost, and the phased array antenna is widely applied to various fields such as aerospace, military, weather, communication and the like. The phased array antenna mainly comprises a phased array amplitude and phase adjusting module and a phased array surface. The phased array surface is composed of a plurality of phased array units, and the phased array surface is arranged according to a certain mode. The amplitude and phase adjusting module provides amplitude and phase adjusting functions for one or a group of phased array units. Referring to fig. 1, which is a schematic structural diagram of a phased array antenna in the prior art, each phased array unit distributed on a phased array surface can radiate electromagnetic waves into space, and the radiation capability in different directions is different, and is called a radiation pattern. The working principle of the phased array antenna is that electromagnetic waves formed in space by the phased array units are superposed to form a total radiation pattern of the phased array. The phased array antenna has the principle that one or a group of phased array units are subjected to amplitude and phase adjustment through the amplitude and phase adjustment unit, so that different electromagnetic wave superposition fields can be formed in space, and different radiation directional diagrams are formed.
The phased array needs to form a desired radiation pattern, the amplitude phase of each phased array unit channel is kept in the same initial state, and then the desired different radiation patterns are formed through the control of the amplitude and phase adjusting module. Due to the fact that components in each phased array unit channel are different, the amplitude and the phase of the electromagnetic waves radiated in the initial state are inconsistent. During development and production, the initial amplitude and phase of each path or group of phased array element channels need to be calibrated. In addition, the resulting radiation pattern is typically tested to ensure that the calibration results and the amplitude and phase adjustment module are working properly.
Referring to fig. 2, a schematic diagram of a compact range testing system for testing or calibrating a wireless device under test 140 according to an embodiment is shown, in which the wireless device under test 140 is a phased array antenna, and includes a test meter 110, a test antenna 120, a reflector 130, and a carrier 150. The test antenna 120 is disposed above the carrier 150 and avoids a signal transmission path between the reflection device 130 and the carrier 150. The test antenna 120 is used to transmit and/or receive signals. The reflection device 130 is used for converting the test signal transmitted by the test antenna 120 into a uniform signal and reflecting the uniform signal to the wireless device under test 140 for reception, and/or is used for reflecting and focusing the test signal transmitted by the wireless device under test 140 to the test antenna 120 for reception. The mobile platform mechanism 150 is used to carry the wireless device under test 140 to be tested.
Since the reflection device has a fixed dead zone range, the amplitude and phase of the electromagnetic wave fluctuate greatly beyond the range, and the test precision is deteriorated. In the embodiment of the application, the moving platform mechanism is used for controlling the phased array antenna to move, the radiation unit of the phased array antenna is divided into a plurality of sub-areas, the sub-areas are sequentially arranged in the quiet area of the reflector system through translation of the moving platform mechanism, and the phased array units in the sub-areas are subjected to amplitude-phase calibration or test one by one, so that amplitude-phase calibration or test of large-size phased array antennas exceeding the size of the quiet area is realized in a small compact range system.
The first embodiment is as follows:
referring to fig. 3, a schematic structural diagram of another embodiment of a compact range testing system is shown, which includes a test signal generating device 10, a reflecting device 20, and a moving platform mechanism 40. The test signal generating device 10 is used for sending a test signal with preset parameters to the reflecting device 20. The reflection device 20 is used to reflect the test signal and form a uniform plane wave test signal in a predetermined dead zone area 30 within the reflection zone. The moving platform mechanism 40 is used for carrying the phased array antenna 50 to be tested, and arranging part of the phased array units in the phased array antenna 50 in the dead zone area 30 in a moving manner so as to test or calibrate the phased array units of the phased array antenna 50 arranged in the dead zone area 30.
In one embodiment, the compact range testing system further includes an anechoic chamber 60. The test signal generating device 10, the reflecting device 20 and the moving platform mechanism 40 are arranged in the anechoic chamber 60. Anechoic chamber 60 is used to provide a compact field testing environment. In one embodiment, the reflector 20 is disposed at the top of the anechoic chamber 20, and the moving platform mechanism 40 is disposed at the bottom of the anechoic chamber 30.
In one embodiment, the reflection device 20 includes a reflection surface 21 and a reflection moving mechanism 22, and the reflection moving mechanism 22 is used for carrying the reflection surface 21 and changing the spatial position of the quiet zone area 30 in the anechoic chamber 60 by moving. In one embodiment, the reflective moving mechanism 22 is further configured to move the test signal generating device 10 synchronously to maintain the relative spatial position between the test signal generating device 10 and the reflective device 20 constant. In one embodiment, the compact range testing system further comprises a test meter 70, and the test meter 70 is connected to the test signal generating device 10 and the phased array antenna 50, respectively. The test meter 70 is used to generate test signals or to analyze test signals received by the phased array antenna. In one embodiment, the test meter 70 is a network analyzer. It is understood that the test meter 60 may be placed inside the anechoic chamber 60, as shown in fig. 3; or may be placed outside of the electric wave cues 60 as shown in figure 2 to facilitate operation/reduce interference with the test.
In one embodiment, the test signal generating device 10 includes a dual polarized measurement probe for transmitting test signals to achieve dual polarized amplitude and phase calibration of the phased array antenna 50.
In one embodiment, the test signal generating apparatus 10 includes a single-polarized measurement probe 11 and a probe rotating mechanism 12. The single-polarized measurement probe 11 is used to transmit a test signal. The probe rotating mechanism 12 is used for bearing the single-polarization measuring probe 11, and the probe rotating mechanism 12 is further used for rotating the single-polarization measuring probe 11 according to a preset probe rotating shaft so as to realize dual-polarization amplitude-phase calibration of the phased array antenna 50.
In one embodiment, the moving platform mechanism 40 includes a planar moving device for moving the phased array antenna 50 in parallel in a predetermined plane. In one embodiment, the moving platform mechanism 40 includes a lifting device for controlling the elevation of the phased array antenna 50. In one embodiment, the moving platform mechanism 40 includes an axial rotation device, and the axial rotation device is configured to control the phased array elements of the phased array antenna 50 in the quiet zone area 40 to rotate according to a preset antenna rotation axis, so as to achieve dual-polarized amplitude-phase calibration of the phased array antenna 50.
The purpose of the moving platform mechanism 40 to move the phased array antenna 50 includes two aspects: on one hand, when the size of the measured piece (namely, the phased array antenna) is larger and exceeds the size of the quiet zone, the measured piece can be divided into a plurality of zones, the size of each zone is smaller than that of the quiet zone, and the zones of the measured piece are moved into the quiet zone one by one through the moving mechanism to be respectively calibrated; on the other hand, the amplitude and phase of the electromagnetic wave are not strictly uniform and have a certain degree of fluctuation in the dead zone region of the reflection surface. For an application scenario with a high requirement on calibration accuracy, calibration can be performed in a local quiet zone with very good performance (the quiet zone performance and the position of the local quiet zone can be known in quiet zone testing or quiet zone verification), when the size of a tested piece exceeds the size of the local quiet zone area, similarly, the tested piece can be divided into a plurality of areas, the size of each area is smaller than that of the local quiet zone, and the areas of the tested piece are moved into the local quiet zone one by one through a moving mechanism to be calibrated respectively. Optionally, the method for determining the local dead zone includes: and determining the performance index of the dead zone meeting the precision according to the precision required by calibration, and accordingly selecting and determining the local dead zone meeting the performance index in the whole dead zone range. The local quiet zone may include a plurality of zones, each corresponding to a different accuracy requirement. The relevant data may be pre-recorded in the controller and read/selected as required.
It should also be noted that: the measuring probe is used for generating plane wave irradiation, the measuring probe is dual polarized by default, and the two polarizations are controlled through a polarization switch to generate plane waves respectively for amplitude-phase calibration. Or a single-polarization measuring probe can be adopted, after the amplitude-phase calibration of the polarization is carried out on the phased array antenna, the phased array antenna is rotated by 90 degrees on the horizontal plane, and then the amplitude-phase calibration of the other polarization direction is realized by the probe. Therefore, the moving platform mechanism also needs to have a one-position rotation function. In one embodiment, the measuring probe and the reflecting surface are used for generating plane wave illumination, wherein the measuring probe defaults to dual polarization, and the two polarizations are controlled through a polarization switch to respectively generate plane waves for amplitude-phase calibration. It is also possible to use a single-polarization measurement probe, after the amplitude-phase calibration of the polarization of the phased array antenna, by rotating the measurement probe by 90 ° in the main radiation direction (axis) and then using the probe to perform the amplitude-phase calibration of the other polarization direction. In this case, the measuring probe needs to be provided with a probe rotating mechanism 12 with a rotating function.
The compact range testing system in an embodiment of the application forms the characteristic of plane waves in a testing area, can be used for the tested phased array or units in one area of the tested phased array to execute amplitude-phase calibration, does not need to accurately position each unit like a plane near field and calibrate one by one, and can finish calibration only by switching channels of the phased array units to acquire amplitude-phase data one by one. The compact range test system can realize the calibration of a larger tested piece under the limited size of the reflecting surface (namely the limited size of a dead zone area). That is, the phased array antenna can be divided into a plurality of sub-regions in a smaller reflection surface, the sub-regions are respectively placed in the quiet zone, and the units in the sub-regions are calibrated one by one, so that the amplitude and phase calibration of the large-size phased array antenna exceeding the size of the quiet zone is realized. The construction cost of a large reflecting surface system is saved. In addition, the compact range testing system is also suitable for scenes with high requirements on precision. The performance index of the quiet zone area meeting the calibration precision can be flexibly determined according to the calibration precision, and then the local quiet zone meeting the performance index of the quiet zone area is determined for calibration and test. The compact range test system can also be used for testing the performance indexes such as EIRP, G/T value and the like of the phased array, and the tests are usually carried out in a large and high-cost far-field dark room system. In one embodiment, the reflecting surface of the compact range testing system is arranged at the top of the anechoic chamber, and the mobile platform mechanism is arranged at the bottom, so that the phased array antenna is very convenient to mount and erect, is more stable and reliable in the testing process, and saves the mounting and testing time of the phased array antenna.
The compact range testing system disclosed by the application comprises a testing signal generating device, a reflecting device and a moving platform mechanism. The test signal generating device is used for sending a test signal with preset parameters to the reflecting device. The reflection device is used for reflecting the test signal so as to form a uniform plane wave test signal in a preset dead zone area in the reflection zone range. The mobile platform mechanism is used for arranging part of the phased array units in the phased array antenna in a quiet zone area in a mobile mode so as to test or calibrate the phased array units in the quiet zone area. Because partial phased array units in the phased array antenna can be calibrated in batches or in sequence, the compact range testing system can perform calibration in a dead zone area with very good performance, the occupied area of the compact range testing system can be reduced, and the calibration precision can be improved.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A compact range testing system is characterized by comprising a testing signal generating device, a reflecting device and a moving platform mechanism;
the test signal generating device is used for sending a test signal with preset parameters to the reflecting device;
the reflecting device is used for reflecting the test signal and forming a uniform plane wave test signal in a preset quiet area within the range of the reflecting area;
the mobile platform mechanism is used for bearing the phased array antenna to be tested, and arranging part of phased array units in the phased array antenna in the static area in a moving mode so as to test or calibrate the phased array units of the phased array antenna arranged in the static area.
2. A compact range testing system as claimed in claim 1 further comprising an anechoic chamber; the test signal generating device, the reflecting device and the mobile platform mechanism are arranged in the anechoic chamber; the anechoic chamber is used for providing a test environment for detecting the phased array antenna.
3. A compact range testing system as claimed in claim 2 wherein said reflective means is disposed at the top of said anechoic chamber and said moving platform mechanism is disposed at the bottom of said anechoic chamber.
4. The compact range testing system of claim 2, wherein said reflective device comprises a reflective surface and a reflective moving mechanism for carrying said reflective surface and movably changing the spatial position of said quiet zone within said anechoic chamber;
the reflection moving mechanism is also used for synchronously moving the test signal generating device so as to keep the relative spatial position between the test signal generating device and the reflection device constant.
5. A compact range testing system as claimed in claim 1 further comprising a test meter connected to said test signal generating means and said phased array antenna, respectively; the test meter is for generating the test signal or for analyzing the test signal received by the phased array antenna.
6. A compact range testing system according to claim 1, wherein said test signal generating means comprises dual polarised measurement probes; the dual-polarization measuring probe is used for sending the test signal so as to realize dual-polarization amplitude-phase calibration of the phased array antenna.
7. A compact range testing system according to claim 1 wherein said test signal generating means comprises a single polarized measurement probe and a probe rotation mechanism;
the single-polarization measuring probe is used for sending the test signal;
the probe rotating mechanism is used for bearing the single-polarization measuring probe and rotating the single-polarization measuring probe according to a preset probe rotating shaft so as to realize dual-polarization amplitude-phase calibration of the phased array antenna.
8. A compact range testing system as claimed in claim 1 wherein said moving platform mechanism includes planar moving means for moving said phased array antenna in parallel in a predetermined plane.
9. The compact range testing system of claim 1, wherein said moving platform mechanism includes a lift device for lift control of said phased array antenna.
10. The compact range testing system of claim 1, wherein the moving platform mechanism comprises an axial rotating device; the axial rotating device is used for rotationally controlling the phased array unit of the phased array antenna in the static area according to a preset antenna rotating shaft so as to realize dual-polarized amplitude-phase calibration of the phased array antenna.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222318004.7U CN218499141U (en) | 2022-08-31 | 2022-08-31 | Compact range testing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222318004.7U CN218499141U (en) | 2022-08-31 | 2022-08-31 | Compact range testing system |
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| CN218499141U true CN218499141U (en) | 2023-02-17 |
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| CN202222318004.7U Active CN218499141U (en) | 2022-08-31 | 2022-08-31 | Compact range testing system |
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