CN111650566A - Radar reliability test system - Google Patents
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- CN111650566A CN111650566A CN202010360367.XA CN202010360367A CN111650566A CN 111650566 A CN111650566 A CN 111650566A CN 202010360367 A CN202010360367 A CN 202010360367A CN 111650566 A CN111650566 A CN 111650566A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
Abstract
The application relates to a radar reliability test system, which comprises a middle far field wave absorbing channel; a third comprehensive test chamber; the three comprehensive test chambers comprise climate chambers for accommodating radars to be tested; the climate box comprises a first inner wall facing the middle far field wave absorbing channel; the first inner wall is provided with a wave-transmitting window; the wave-transmitting plate covers the wave-transmitting window to seal the climate box; the wave absorbing device in the box is laid on the absorbing inner wall; the absorption inner wall is the inner wall which reflects the electromagnetic wave in the climatic chamber when the electromagnetic wave transmitted by the radar to be detected is transmitted to the middle far field wave-absorbing channel. The method and the device can ensure that reflected waves are eliminated, electromagnetic wave energy radiated by the array surface of the high-power radar antenna to be tested is directionally and efficiently absorbed, the radar system working at the full array surface and the full power can be tested, the influence of residual waves existing in the test environment on verification of key technical indexes is avoided, the test environment can simulate and restore the actual working scene of the radar to be tested, and the credibility of the test result is further improved.
Description
Technical Field
The application relates to the technical field of radar testing, in particular to a radar reliability testing system.
Background
With the development of radar testing technology, radar reliability testing systems have appeared. In the stages of development, sizing and batch production of the radar, the reliability level of the radar can be tested by developing a reliability background test, a growth test, an identification test, an acceptance test and the like, and the radar is ensured to have higher reliability level. During the reliability test of the radar, the key technical indexes for testing the radar are important contents of the reliability test of the radar. The key technical indexes can be technical indexes of the radar system in a full-array-surface and full-power working state, such as transmitted signal spectrum, power aperture product, continuous transmission time and the like.
However, in the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the existing radar reliability test system easily influences the verification of radar key technical indexes and influences the credibility of test results.
Disclosure of Invention
Therefore, it is necessary to provide a radar reliability test system capable of reducing the influence and improving the reliability of the test result, aiming at the technical problem that the conventional radar reliability test system influences the reliability of the test result.
A radar reliability testing system, comprising:
a middle far field wave absorbing channel;
a third comprehensive test chamber; the three comprehensive test chambers comprise climate chambers for accommodating radars to be tested; the climate box comprises a first inner wall facing the middle far field wave absorbing channel; the first inner wall is provided with a wave-transmitting window;
the wave-transmitting plate covers the wave-transmitting window to seal the climate box;
the wave absorbing device in the box is laid on the absorbing inner wall; the absorption inner wall is the inner wall which reflects the electromagnetic wave in the climatic chamber when the electromagnetic wave transmitted by the radar to be detected is transmitted to the middle far field wave-absorbing channel.
In one embodiment, the absorbent inner wall comprises a first inner wall, a second inner wall, and a third inner wall; the second inner wall and the third inner wall are respectively positioned at two sides of the climate box along the direction of the electric field of the electromagnetic wave;
the wave absorption device in the box covers the rest parts of the first inner wall except the wave transmission window;
the in-box wave absorption device covers the second inner wall, and the lowest point of the in-box wave absorption device on the second inner wall is lower than or level with the lowest point of the antenna array surface of the radar to be detected;
the in-box wave absorption device covers the third inner wall, and the lowest point of the in-box wave absorption device on the third inner wall is lower than or flush with the lowest point of the antenna array surface of the radar to be detected.
In one embodiment, the system further comprises an environmental control device;
and the outlet of the environment control device is used for being communicated with the inlet of the cooling channel of the radar to be detected.
In one embodiment, the system further comprises a liquid nitrogen device;
an outlet of the liquid nitrogen device is communicated with an accommodating cavity used for accommodating the radar to be detected in the climate box.
In one embodiment, the system further comprises a power supply device;
the power supply device is used for electrically connecting the radar to be detected.
In one embodiment, the system further comprises a target simulator and a waveguide electrically connected to the target simulator; the waveguide is used for electrically connecting the test equipment;
the target simulator is arranged in the middle and far field wave-absorbing channel and is used for receiving electromagnetic waves; the electromagnetic wave received by the target simulator is propagated to the test equipment through the waveguide.
In one embodiment, a portion of the climate box is disposed within the mid-far field wave absorbing channel.
In one embodiment, the middle far-field wave absorbing channel comprises a wave absorbing material with reflection loss larger than-40 dB @8 GHz-40 GHz and main wave-facing surface power bearing capacity larger than or equal to 8 kW/square meter.
In one embodiment, the triple composite test chamber further comprises a vibration table and a control circuit electrically connected with the vibration table;
the shaking table is arranged in the climate box and used for placing the radar to be measured.
In one embodiment, the wave absorbing power of the wave absorbing device in the box is greater than or equal to 20kW per square meter.
One of the above technical solutions has the following advantages and beneficial effects:
the radar reliability test system in each embodiment of the application comprises a middle far field wave absorbing channel; a third comprehensive test chamber; the three comprehensive test chambers comprise climate chambers for accommodating radars to be tested; the climate box comprises a first inner wall facing the middle far field wave absorbing channel; the first inner wall is provided with a wave-transmitting window; the wave-transmitting plate covers the wave-transmitting window to seal the climate box; the wave absorbing device in the box is laid on the absorbing inner wall; the absorption inner wall is the inner wall which reflects the electromagnetic wave in the climatic chamber when the electromagnetic wave transmitted by the radar to be detected is transmitted to the middle far field wave-absorbing channel. In this application, the incasement is inhaled ripples device, wave-transparent window and well far field and has jointly formed the high-efficient environment of inhaling ripples, thereby can ensure to eliminate the back wave, realize the orientation, the electromagnetic wave energy of high-power radar antenna array face radiation that awaits measuring is absorbed to the high efficiency, key technical index for the radar that awaits measuring verifies and provides no echo test environment, can test the radar system that works at full array face, full power, the influence of the remaining ripples that exists in the test environment to key technical index verification is avoided, make the test environment can simulate, the actual work scene of the radar that awaits measuring is restoreed, and then test result credibility has been improved.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the subject matter of the present application.
FIG. 1 is a first schematic block diagram of a radar reliability testing system in one embodiment;
FIG. 2 is a first schematic view of an absorbent inner wall in one embodiment;
FIG. 3 is a second schematic block diagram of a radar reliability testing system in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "disposed," "laid," "covered," "placed," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
At present, the key technical indexes of the radar can be measured and verified under the condition of temperature-humidity-vibration comprehensive environmental stress, so that the reliability test of the radar is realized. The traditional radar reliability test system can only absorb the electromagnetic wave energy which penetrates through the wave-transparent window, and no measures are taken for the electromagnetic wave energy which does not penetrate through the wave-transparent window. Early radar systems had lower transmit power and tests were generally completed by taking temporary protective measures outside the system.
However, with the continuous breakthrough of the function and the continuous improvement of the performance of the radar system, the detection capability and the transmitting power of the radar system are also obviously improved, and the energy of the electromagnetic waves which do not penetrate through the wave-transparent window is gradually increased during the test. If a conventional system is used for reliability tests, the following problems can occur: (1) in the traditional system, the wave-absorbing channel has poor wave-absorbing capacity, and the working performance of the full array surface of the radar antenna in the maximum duty ratio mode cannot be verified, namely the electromagnetic wave energy of a high-power radar system in the full-array surface full-power working mode cannot be effectively absorbed, so that the key technical index test of the radar is influenced; (2) electromagnetic wave energy which does not penetrate through the wave-transmitting window can be reflected in the box or even penetrates through the metal wall, and if the electromagnetic wave energy radiated by the antenna array surface is not absorbed, the electromagnetic wave energy can cause harm to human bodies and electronic equipment, and even can damage a radar to be tested, so that the test fails; (3) the thrust of the vibration table and the temperature rise rate of the climate box do not meet the test requirements, and corresponding test stress is difficult to provide for the radar to be tested; (4) the volume in the test box is small, so that a radar system to be tested is inconvenient to install; (5) and a matched liquid cooling device is not arranged, so that the credibility of a test result is influenced by completely depending on a commission unit.
Therefore, the traditional system is only suitable for the full-state work of the early radar during the reliability test period, and cannot meet the reliability test requirement of the key technical index verification of the current high-power radar.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a radar reliability testing system comprising:
a middle far field wave absorbing channel 110;
a third comprehensive test chamber; the triple integrated test chamber includes a climate chamber 120 for accommodating the radar to be tested; the climate box 120 comprises a first inner wall facing the middle far field wave absorbing channel 110; the first inner wall is provided with a wave-transparent window 131;
a wave-transparent plate covering the wave-transparent window 131 to seal the climate chamber 120;
an in-tank absorber 130 laid on the absorbing inner wall; the absorption inner wall is the inner wall which reflects the electromagnetic wave in the climate box 120 when the electromagnetic wave transmitted by the radar to be detected is transmitted to the middle far field wave-absorbing channel 110.
Specifically, the triple-chamber may be a device for synchronously applying stresses such as temperature, humidity, and vibration to the radar to be tested according to a predetermined period to perform temperature, humidity, and vibration, and may include a climate chamber 120 and a vibration table. In the test, the radar to be tested can be arranged in the climate box 120, and the stress such as temperature, humidity, vibration and the like can be integrated into the climate box 120 according to a specified period, so that the stress can be synchronously applied to the radar to be tested. The climate box 120 may be disposed entirely within the middle far-field wave absorbing channel 110, entirely outside the middle far-field wave absorbing channel 110, or partially within the middle far-field wave absorbing channel 110. For example, the first inner wall of the climate box 120 may be disposed to fit the middle far field wave absorbing channel, or the first inner wall of the climate box 120 may be disposed in the middle far field wave absorbing channel.
The climate box 120 may comprise an inner wall, which may be the face inside the climate box 120, i.e. the face facing the radar to be measured, and an outer wall, which may be the face outside the climate box 120, i.e. the face facing away from the radar to be measured. The radar under test may be located inside the climate box 120. The climate chamber 120 may comprise a first inner wall, which may be an inner wall facing the mid-far field wave absorbing channel 110. Further, among the respective inner walls of the climate box 120, the geometric center of the first inner wall may be the closest distance to the middle far-field wave-absorbing channel 110. A wave-transparent window 131 is opened on the first inner wall, so that the interior and the exterior of the climate box 120 can be communicated through the wave-transparent window 131. The size of the wave-transparent window 131 may be determined according to the main side lobe characteristics of the radar to be measured, for example, the size of the wave-transparent window 131 may be 2m (meters) × 2m (length multiplied by width).
The wave-transmitting plate can be used for covering the wave-transmitting window 131, and a sealed space is formed inside the climate box 120, so that the radar to be tested can be subjected to temperature regulation meeting the test requirement during the test, and the energy consumption of the temperature regulation is reduced. The size of the wave-transmitting plate may have a length equal to or greater than the length of the wave-transmitting window 131, and the width of the wave-transmitting plate may be equal to or greater than the width of the wave-transmitting window 131. The length and width of the wave-transmitting plate can be determined according to design requirements, and taking a wave-transmitting window 131 of 2m × 2m as an example, the size of the wave-transmitting plate can be 2m × 2m (length multiplied by width multiplied by height).
Furthermore, the wave-transmitting plate can be made of a material with high wave-transmitting rate, so that the electromagnetic waves emitted by the radar to be detected can penetrate through the wave-transmitting plate and propagate to the middle far field wave-absorbing channel 110. In one example, the wave-transmitting plate may be made of a material having a wave-transmitting rate of 95% or more and a temperature resistance range of-70 ℃ (centigrade) to 120 ℃, for example, a polyethylene foam plate may be used.
When the reliability test is carried out, the three comprehensive test boxes can simultaneously apply corresponding temperature, humidity and vibration stress on the radar to be tested according to the requirements of the reliability test outline and the environment test outline, and the stress applied by the three comprehensive test boxes can be within the tolerance range of the reliability test outline. The reliability test outline and the environment test outline can be used for indicating the value of the test stress applied to the radar to be tested in the reliability test.
The radar to be measured works under the corresponding test stress, and the radiation direction of the antenna array surface of the radar to be measured is fixed towards the wave-transparent window 131. When the antenna array surface of the radar to be tested radiates electromagnetic waves, part of the electromagnetic waves are transmitted to the middle far field absorption channel through the wave-transmitting plate, and the middle far field absorption channel can absorb the part of the electromagnetic waves, so that a test environment without echo can be provided. Furthermore, the middle and far field absorption channel can be a vacant place, and a wave-absorbing material can be laid on the inner wall of the place so as to realize a test environment without echoes. The field size of the middle and far field wave-absorbing channel 110, the reflection loss of the wave-absorbing material laid in the channel and the power bearing capacity of the main wave-facing surface can be determined according to the technical parameters of the radar to be tested, and the radiation requirements of the radar to be tested in a full-array surface and full-power state can be met, so that the credibility of the test result can be improved.
The rest of the electromagnetic waves radiated by the radar antenna array surface to be measured, i.e. the residual waves, are transmitted to the inner wall of the climate box 120 and do not penetrate through the wave-transparent window 131, and at this time, the inner wall of the climate box 120 that reflects the residual waves can be an absorption inner wall. The absorption inner wall may include an inner wall that reflects electromagnetic waves directly radiated by the front surface of the radar antenna to be measured, and further, may be an inner wall that absorbs electromagnetic waves reflected by other inner walls in the climate box 120.
Taking fig. 2 as an example, the antenna array of the radar to be measured faces the wave-transparent window 131, the electromagnetic wave emitted by the radar to be measured propagates along the direction a, the inner wall 2 is opposite to the inner wall 3, the inner wall 4 is opposite to the inner wall 5, and the inner wall 6 is opposite to the first inner wall.
Part of the electromagnetic waves are transmitted to the middle far field absorption channel through the wave-transmitting window 131 and the wave-transmitting plate, and the rest waves are in the climate box 120. The residual wave can be transmitted to the inner wall 2, the inner wall 3 and/or the first inner wall and reflected by the inner wall 2, the inner wall 3 and/or the first inner wall, the reflected residual wave can be transmitted to the inner wall 4, the inner wall 5 and/or the inner wall 6, and then the residual wave is reflected again by the inner wall 4, the inner wall 5 and/or the inner wall 6.
The absorption inner wall may include the inner wall 2, the inner wall 3 and the first inner wall, and further, the absorption inner wall may further include the inner wall 4, the inner wall 5 and the inner wall 6. The in-box wave absorbing device 130 can be laid on the absorbing inner walls, and when the number of the absorbing inner walls is two or more, the in-box wave absorbing device 130 can be laid on each absorbing inner wall. Further, for each of the absorbing inner walls, the in-tank wave absorbing device 130 may partially or entirely cover the absorbing inner wall, and the arrangement of the in-tank wave absorbing device 130 on the respective absorbing inner walls may not necessarily be connected.
In the case shown in the above example, the absorbing inner walls may be the inner wall 2, the inner wall 3 and the first inner wall, and the absorbing device in the tank may be laid in the following manner: (1) covering the whole of the inner wall 2, the whole of the inner wall 3 and the whole of the first inner wall, respectively; (2) covers a portion of the inner wall 2, the entirety of the inner wall 3, and the entirety of the first inner wall; (3) covers a portion of the inner wall 2, a portion of the inner wall 3, and the entirety of the first inner wall; (4) covering a portion of the inner wall 2, a portion of the inner wall 3 and a portion of the first inner wall. This application is through laying incasement suction device 130 on absorbing the inner wall to can inhale the ripples to the residual wave, avoid the echo to cause harm to the radar that awaits measuring and human body, guarantee radar reliability test's security.
Furthermore, the wave absorbing material selected by the in-box wave absorbing device 130 can be a high-efficiency wave absorbing material, is resistant to high and low temperatures, does not contain corrosive substances such as chlorine and sulfur, can efficiently absorb residual waves which do not penetrate through the wave transmitting window 131, reduces the influence of the in-box wave absorbing device 130 on the inner wall of the climate box 120, further can prevent the radar to be tested and testing personnel from being damaged by reflected waves while ensuring that the testing environment has no echo, and improves the reliability and safety of the test.
The radar reliability test system comprises a middle far field wave absorbing channel; a third comprehensive test chamber; the three comprehensive test chambers comprise climate chambers for accommodating radars to be tested; the climate box comprises a first inner wall facing the middle far field wave absorbing channel; the first inner wall is provided with a wave-transmitting window; the wave-transmitting plate covers the wave-transmitting window to seal the climate box; the wave absorbing device in the box is laid on the absorbing inner wall; the absorption inner wall is the inner wall which reflects the electromagnetic wave in the climatic chamber when the electromagnetic wave transmitted by the radar to be detected is transmitted to the middle far field wave-absorbing channel. In this application, the incasement is inhaled the ripples device, wave-transparent window and well far field inhale the wave channel and jointly formed the high-efficient environment of inhaling, thereby can ensure to eliminate the back wave, realize the orientation, the high-efficient electromagnetic wave energy of the radar antenna array face radiation that awaits measuring, key technical indicator for the radar that awaits measuring verifies and provides no echo test environment, can test the radar system that works at full array face, full power, the influence of the remaining ripples that exists in the test environment to key technical indicator verification is avoided, make the test environment can simulate, the actual work scene of the radar that awaits measuring is restoreed, and then the credibility of experimental result has been improved.
In one embodiment, the absorbent inner wall comprises a first inner wall, a second inner wall, and a third inner wall; the second inner wall and the third inner wall are respectively located on two sides of the climate box 120 along the electric field direction of the electromagnetic wave;
the in-box wave absorbing device 130 covers the rest of the first inner wall except the wave-transmitting window 131;
the in-tank wave absorption device 130 covers the second inner wall, and the lowest point of the in-tank wave absorption device 130 on the second inner wall is lower than or level with the lowest point of the antenna array surface of the radar to be detected;
the in-tank wave absorbing device 130 covers the third inner wall, and the lowest point of the in-tank wave absorbing device 130 on the third inner wall is lower than or level with the lowest point of the antenna array surface of the radar to be detected.
Specifically, the absorbing inner wall may include a first inner wall, a second inner wall, and a third inner wall, where the first inner wall is an inner wall provided with a wave-transparent window 131, the second inner wall and the third inner wall may be two inner walls intersecting with an electric field direction of an electromagnetic wave radiated by a front of the radar antenna to be measured in the climate box 120, taking fig. 2 as an example, the electric field direction of the electromagnetic wave is a B direction, and then the second inner wall and the third inner wall may be an inner wall 2 and an inner wall 3, respectively. The direction of the electric field of the electromagnetic wave is the C direction, the second inner wall and the third inner wall may be the inner wall 4 and the inner wall 5, respectively.
The in-box acoustic wave device 130 may be disposed on the first inner wall, the second inner wall, and the third inner wall, wherein the remaining portion of the first inner wall except the portion opened with the wave-transparent window 131 is covered by the in-box acoustic wave device 130. The in-tank acoustic wave device 130 may cover a portion of the second inner wall, that is, the second inner wall may include a covered region and a non-covered region, the covered region may have an area smaller than the total area of the second inner wall, and the in-tank acoustic wave material is disposed on the covered region of the second inner wall. The area, the shape and the like of the covered area of the second inner wall can be determined according to the total area and the shape of the second inner wall and the technical parameters of the radar to be measured. Furthermore, the coverage area of the second inner wall can match the shape of the second inner wall, so that the area of the second inner wall, which is higher than the lowest point of the in-box wave absorption device 130 on the second inner wall, is covered by the in-box wave absorption device 130, thereby preventing the second inner wall from reflecting electromagnetic waves and generating echoes, further realizing a non-echo test environment and improving the reliability of the test result.
Similarly, the arrangement of the in-box acoustic wave absorption device 130 on the third inner wall may refer to the arrangement of the in-box acoustic wave absorption device 130 on the second inner wall, and the arrangement of the in-box acoustic wave absorption device 130 on the third inner wall is not necessarily related to the arrangement on the second inner wall, and is not necessarily the same as or different from the arrangement on the second inner wall.
Specifically, the in-tank acoustic wave absorption device 130 may cover a portion of the third inner wall, that is, the third inner wall may include a covered region and a non-covered region, and the area of the covered region is smaller than the total area of the third inner wall, and the in-tank acoustic wave absorption material covers the covered region of the third inner wall. The area, the shape and the like of the coverage area of the third inner wall can be determined according to the total area and the shape of the third inner wall and the technical parameters of the radar to be measured.
Furthermore, the coverage area of the third inner wall may match the shape of the third inner wall, so that the area of the third inner wall higher than the lowest point of the in-box wave absorption device 130 on the third inner wall is covered by the in-box wave absorption device 130, thereby preventing the third inner wall from reflecting electromagnetic waves and generating echoes, further realizing a non-echo test environment and improving the reliability of the test result.
In the radar reliability test system, the wave absorption device 130 in the box covers the rest parts of the first inner wall except the wave-transmitting window 131; the in-tank wave absorption device 130 covers the second inner wall, and the lowest point of the in-tank wave absorption device 130 on the second inner wall is lower than or level with the lowest point of the antenna array surface of the radar to be detected; the in-box wave absorbing device 130 covers the third inner wall, and the lowest point of the in-box wave absorbing device 130 on the third inner wall is lower than or flush with the lowest point of the antenna array surface of the radar to be tested, so that the cost of the radar reliability test system can be reduced while the residual wave absorbing effect is ensured.
In one embodiment, the system further includes a ring control 310;
the outlet of the environment control device 310 is used for communicating with the inlet of the cooling channel of the radar to be tested.
Specifically, the radar reliability test system further includes an environment control device 310, where the environment control device 310 is configured to provide a normal operation environment control condition for the radar to be tested, so as to ensure that the radar to be tested is in a normal operation state, and improve the credibility of the test result. The environmental control device 310 can directly provide cooling resources for the radar under test, and in one example, the environmental control device 310 can output ram cooling liquid and/or cooling air to the radar under test, so that the air-cooled radar and/or the liquid-cooled radar can be tested. Wherein the maximum liquid cooling flow rate can be 4000L/h (liter per hour), and the maximum ram cooling air flow rate can be 500Kg/h (kilogram per hour).
The outlet of the environmental control device 310 can be communicated with the inlet of the cooling channel of the radar to be tested, so that the cooling resource can be transmitted to the radar to be tested, and the requirement of the working condition for verifying the key technical index of the radar to be tested can be met. Further, the outlet of the environmental control device 310 can be communicated with the inlet of the cooling channel of the radar to be detected through a pipeline; the environmental control unit 310 may be located outside the climate box 120.
The radar reliability test system further comprises an environment control device 310, wherein an outlet of the environment control device 310 is used for being communicated with a cooling channel inlet of the radar to be tested, so that cooling resources can be output to the radar to be tested through the environment control device 310, normal working environment control conditions are provided for the radar to be tested, a matching device is perfected, the completeness of the radar reliability test system is improved, and the credibility of a test result is ensured.
In one embodiment, the system further comprises a liquid nitrogen device 320;
the outlet of the liquid nitrogen device 320 is communicated with a containing cavity in the climate box 120 for containing the radar to be tested.
Specifically, the radar reliability verification system further includes a liquid nitrogen device 320, and the climate box 120 further includes a containing cavity for containing the radar to be tested. The outlet of the liquid nitrogen device 320 can be communicated with the containing cavity and outputs liquid nitrogen to the containing cavity, so that the cooling capacity of the climate box 120 can be improved in an auxiliary mode. Further, the cooling rate can be greater than or equal to 50 ℃/min (degrees celsius per minute). In one example, the outlet of the liquid nitrogen device 320 may be in communication with the receiving chamber via a conduit.
The size of the accommodating cavity can be determined according to the volume of the radar to be measured, and in one example, the size of the accommodating cavity can be 3m × 2.5m × 3m, so that the installation requirement of the radar to be measured can be met.
In one embodiment, the system further comprises a power supply 330;
the power supply device 330 is used for electrically connecting the radar to be tested.
Specifically, the radar reliability test system further includes a power supply device 330, the power supply device 330 may be configured to electrically connect to the radar to be tested, and the power supply device 330 may provide the radar to be tested with the electrical stress required in the test and bias the radar according to the test requirement. Further, the power supply unit 330 may include a 270V (volt) dc power supply (60kW) and a 115V/400Hz (hertz) ac power supply (40kW) required for normal operation of the radar to be tested.
In one embodiment, the system further includes a target simulator 340 and a waveguide 350 electrically connected to the target simulator 340; the waveguide 350 is used to electrically connect the test equipment;
the target simulator 340 is arranged in the middle far field wave absorbing channel 110 and is used for receiving electromagnetic waves; the electromagnetic waves received by the target simulator 340 propagate to the test equipment via the waveguide 350.
Specifically, the radar reliability test system further comprises a target simulator 340 and a waveguide 350, wherein one end of the waveguide 350 is electrically connected with the target simulator 340, and the other end of the waveguide is used for electrically connecting with the test equipment. Wherein the testing device can be a power meter, a spectrometer, etc.
The target simulator 340 may be disposed in the middle far field wave absorbing channel 110, so as to receive an electromagnetic wave signal radiated by a front of the radar antenna to be tested, and transmit the received electromagnetic wave signal to the testing equipment through the waveguide 350. By monitoring the output of the test equipment, the technical parameters of the radar to be tested can be obtained.
In one embodiment, portions of the climate chamber 120 are disposed within the mid far field wave absorbing channel 110.
Specifically, as shown in fig. 1, a part of the climate box 120 is disposed in the middle far-field wave-absorbing channel 110, and another part of the climate box is disposed outside the middle far-field wave-absorbing channel 110, so that the wave-transmitting window 131 is disposed in the middle far-field wave-absorbing channel 110, and most of the electromagnetic waves radiated by the antenna front of the radar to be tested are ensured to enter the middle far-field wave-absorbing channel 110, thereby improving the reliability and credibility of the test result.
In one embodiment, the middle far-field wave-absorbing channel 110 comprises a wave-absorbing material with reflection loss greater than-40 dB @8 GHz-40 GHz and main wave-facing surface power bearing capacity greater than or equal to 8 kW/square meter.
Specifically, the inner wall of the middle and far field wave-absorbing channel 110 may be provided with a high-performance wave-absorbing material, the reflection loss of the high-performance wave-absorbing material may be greater than-40 dB (decibel) @8 GHz-40 GHz (gigahertz), and the main front wave surface power carrying capacity is greater than or equal to 8 kW/square meter (kilowatt per square meter), so that the middle and far field wave-absorbing channel 110 may absorb most of the electromagnetic waves radiated by the antenna array surface, and create a non-echo test environment for the verification of the key technical index of the radar to be tested.
In one embodiment, the triple composite test chamber further comprises a vibration table and a control circuit electrically connected with the vibration table;
the vibration table is arranged in the climate box 120 and is used for placing the radar to be tested.
Specifically, the three-combination test box can further comprise a vibration table and a control circuit, the radar to be tested is arranged on the vibration table, the control circuit is electrically connected with the vibration table and controls vibration of the vibration table, and therefore corresponding vibration stress can be applied to the radar to be tested through the vibration table.
In one embodiment, the wave absorbing power of the wave absorbing device 130 in the box is greater than or equal to 20kW per square meter.
Specifically, the wave absorbing power of the wave absorbing device 130 in the box can be greater than or equal to 20kW per square meter, that is, the peak power borne by the unit area of the wave absorbing device 130 in the box is greater than or equal to 20kW, so that the residual waves which do not completely penetrate through the wave transmitting window 131 can be efficiently absorbed. Further, the in-box absorber 130 may be a triangular convex structure. In one example, the wave absorbing device 130 in the tank may be made of a wave absorbing material made of silicon carbide.
To facilitate understanding of the solution of the present application, a specific example is described below, and as shown in fig. 3, a radar reliability test system is provided, which includes three integrated test chambers, a middle far-field wave-absorbing channel 110, a target simulator 340, a waveguide 350, an environment control device 310, a liquid nitrogen device 320 and a power supply device 330. The three comprehensive test boxes, the middle far field wave absorbing channel 110, the target simulator 340, the waveguide 350, the environment control device 310, the liquid nitrogen device 320 and the power supply device 330 can be independently and separately used, so that the utilization rate of equipment can be improved.
The three comprehensive test boxes comprise a climate box 120, a vibration table and a control circuit, wherein the control circuit is electrically connected with the vibration table, and the vibration table is arranged in an accommodating cavity of the climate box 120. The climate box 120 comprises a first inner wall facing the middle far field wave absorbing channel 110, the first inner wall is provided with a wave transmitting window 131, and the wave transmitting plate covers the wave transmitting window 131 and seals the accommodating cavity of the climate box 120.
The climate box 120 further includes a second inner wall and a third inner wall, where the in-box absorber 130 is laid on both the second inner wall and the third inner wall, specifically, the first inner wall is covered by the in-box absorber 130 except the portion where the wave-transparent window 131 is opened, and the areas where the second inner wall and the third inner wall are higher than the radar antenna array to be detected are covered by the in-box absorber 130.
The temperature range, the humidity range, the thrust force of the vibration table and other technical capabilities of the three comprehensive test boxes can be determined according to the reliability test requirements of the equipment platform in service, in service and in discussion, and the optimal cost-effectiveness ratio can be determined on the basis of meeting the use requirements.
Further, the triple combined test chamber can also comprise a clamp, and the clamp is used for fixing the radar to be tested. The temperature range, the maximum temperature change rate and other test capabilities of the three comprehensive test boxes can be determined according to the size, the installation angle and the installation operation space of the radar to be tested. The thrust of the vibration table can be determined according to the high power of the radar to be detected, the weight of the clamp and the vibration stress.
The temperature range of the three comprehensive test chambers can be-70 ℃ to 85 ℃, the maximum temperature rise rate is greater than or equal to 15 ℃/min, the requirements of the temperature range and the humidity change rate specified by the test section are met, the thrust of the vibration table is greater than or equal to 200kN (kilonewtons), and the important and maximum vibration stress magnitude requirements of the radar to be tested and the necessary clamp are met.
The radar reliability test system is suitable for reliability tests of high-power radar systems, can also be used for environment tests such as high temperature, low temperature, vibration, impact, damp and hot and the like, or environment tests or reliability tests are carried out on other equipment or systems with high-power radio frequency output, and the matching device is perfect.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A radar reliability testing system, comprising:
a middle far field wave absorbing channel;
a third comprehensive test chamber; the three comprehensive test chambers comprise climate chambers for accommodating radars to be tested; the climatic chamber comprises a first inner wall facing the middle far field wave absorbing channel; the first inner wall is provided with a wave-transmitting window;
a wave-transmitting plate covering the wave-transmitting window to seal the climate box;
the wave absorbing device in the box is laid on the absorbing inner wall; the absorption inner wall is the inner wall which reflects the electromagnetic waves in the climatic chamber when the electromagnetic waves emitted by the radar to be detected are transmitted to the middle far field wave absorption channel.
2. The radar reliability testing system of claim 1, wherein said absorbing interior walls include said first interior wall, second interior wall, and third interior wall; the second inner wall and the third inner wall are respectively positioned at two sides of the climate box along the direction of the electric field of the electromagnetic wave;
the wave absorption device in the box covers the rest part of the first inner wall except the wave-transparent window;
the in-box wave absorption device covers the second inner wall, and the lowest point of the in-box wave absorption device on the second inner wall is lower than or flush with the lowest point of the antenna array surface of the radar to be detected;
the in-box wave absorption device covers the third inner wall, and the lowest point of the in-box wave absorption device on the third inner wall is lower than or flush with the lowest point of the antenna array surface of the radar to be detected.
3. The radar reliability testing system of claim 1, wherein said system further comprises an environmental control device;
and the outlet of the environment control device is used for being communicated with the inlet of the cooling channel of the radar to be detected.
4. The radar reliability testing system of claim 1, wherein the system further comprises a liquid nitrogen device;
and an outlet of the liquid nitrogen device is communicated with an accommodating cavity used for accommodating the radar to be detected in the climatic chamber.
5. The radar reliability testing system of claim 1, wherein the system further comprises a power supply device;
the power supply device is used for electrically connecting the radar to be detected.
6. The radar reliability testing system of claim 1, wherein the system further comprises a target simulator and a waveguide electrically connecting the target simulator; the waveguide is used for electrically connecting test equipment;
the target simulator is arranged in the middle far field wave absorbing channel and is used for receiving the electromagnetic waves; the electromagnetic wave received by the target simulator propagates to the test equipment through the waveguide.
7. The radar reliability testing system according to any one of claims 1 to 6, wherein a portion of the climate box is disposed within the mid-far field wave absorbing channel.
8. The radar reliability test system of any one of claims 1 to 6, wherein the mid-far field wave absorbing channel comprises a wave absorbing material with reflection loss greater than-40 dB @8 GHz-40 GHz and main wave front power bearing capacity greater than or equal to 8kW/° square meter.
9. The radar reliability testing system according to any one of claims 1 to 6, wherein the triple-purpose test chamber further comprises a vibration table and a control circuit electrically connected to the vibration table;
the shaking table is arranged in the climate box and used for placing the radar to be detected.
10. The radar reliability testing system according to any one of claims 1 to 6, wherein the wave absorption power of the wave absorption device in the tank is greater than or equal to 20kW per square meter.
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Application publication date: 20200911 |