CN211856880U

CN211856880U - Radar test system

Info

Publication number: CN211856880U
Application number: CN201922177866.0U
Authority: CN
Inventors: 东君伟; 冼育览; 卜景鹏; 毛记平; 乔梁
Original assignee: Zhongshan Xiangshan Microwave Technology Co ltd
Current assignee: Zhongshan Xiangshan Microwave Technology Co ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-11-03
Anticipated expiration: 2029-12-06

Abstract

The utility model provides a radar test system, include the microwave darkroom, all locate radio frequency test equipment and first manipulator in the microwave darkroom, radio frequency test equipment with first manipulator electricity is connected, first manipulator is used for the installation radar that awaits measuring and can drives the radar that awaits measuring is aimed at radio frequency test equipment is along predetermineeing the orbit scanning, the microwave darkroom is equipped with the confession first manipulator stretches out the material loading window of changing the radar that awaits measuring. The radar test system provided by the utility model simulates the free space environment through the microwave darkroom, can realize all-weather radar test work, and is not interfered by environmental factors; secondly, the first mechanical arm carries the radar to be tested to perform high-precision scanning test, the positioning precision is high, and the precise test can be realized; and because the microwave darkroom is provided with the feeding window, personnel do not need to enter and exit the microwave darkroom to replace the radar to be tested when batch testing is carried out, and the testing efficiency is high.

Description

Radar test system

Technical Field

The utility model relates to a radar test technical field especially relates to a radar test system.

Background

At present, with the rapid development of intelligent automobile technology, the auxiliary radar arranged on the automobile body can effectively sense the surrounding environment, detect the position of an obstacle, calculate the distance and the speed of surrounding vehicles, remind a driver to make reasonable response and the like, and even can assist the automobile to finish automatic driving. A plurality of potential dangers on the road can be accurately predicted through the radar and certain defense measures can be taken, so that traffic accidents caused by reasons of distraction, fatigue, technical failure and the like of a driver can be avoided.

The test of the automobile auxiliary radar needs to be carried out on the whole machine, belongs to the field of active antenna test, and comprises an antenna directional diagram, equivalent transmitting power, environmental noise, equivalent sensitivity and the like of the radar to be tested, and the test requirements are increased along with the calibration of continuously improved antenna indexes, including the characteristic requirements of more accurate gain, cross polarization, fifth-generation mobile communication air interface parameters and the like. However, no matter research and development test or production line test, the radar test system in the field of automobile auxiliary radar is still in a technological blank at home and abroad at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can satisfy the radar test system of research and development test and production test demand of radar.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides a radar test system, includes the microwave darkroom, all locates radio frequency test equipment and first manipulator in the microwave darkroom, radio frequency test equipment with first manipulator electricity is connected, first manipulator is used for the installation radar that awaits measuring and can drives the radar that awaits measuring is aimed at radio frequency test equipment is along predetermineeing the orbit scanning, the microwave darkroom is equipped with the confession first manipulator stretches out the material loading window of changing the radar that awaits measuring.

Preferably, the first manipulator is provided with at least two manipulators, the at least two manipulators are arranged in front of the feeding window side by side, and the radars to be tested can be alternately replaced from the feeding window for testing.

Preferably, the feeding window is a first shielding door capable of being opened and closed automatically.

Preferably, the radio frequency test equipment comprises a second manipulator, a plurality of radio frequency devices and a radio frequency analyzer, wherein the radio frequency devices are arranged on the second manipulator and can be respectively driven by the second manipulator to align to the radar to be tested, and the radio frequency analyzer is electrically connected with the radio frequency devices.

Further, the radio frequency device comprises a standard gain horn antenna and three corner reflectors of different RCS.

Preferably, the radar test system further comprises a laser calibration device configured on the first manipulator and used for assisting the first manipulator to align the radar to be tested with the radio frequency test equipment.

Preferably, the first manipulator is a six-axis manipulator.

Preferably, the anechoic chamber comprises a shielding chamber made of a metal material and a wave-absorbing material attached in the shielding chamber.

Preferably, the anechoic chamber is further provided with a second shielding door for personnel to enter and exit, the wave-absorbing material comprises a conical wave-absorbing material and a flat wave-absorbing material, the flat wave-absorbing material is laid at the bottom of the shielding chamber and forms a walkway for connecting the second shielding door, the first mechanical arm and the radio frequency testing equipment, and the conical wave-absorbing material is laid on the side wall, the top and the bottom of the shielding chamber at positions which are not covered by the flat wave-absorbing material.

Furthermore, the radar test system also comprises a display and control device which is arranged outside the microwave darkroom and is electrically connected with the radio frequency test device.

Compared with the prior art, the utility model discloses a scheme has following advantage:

1. the radar test system provided by the utility model simulates the free space environment through the microwave darkroom, can realize all-weather radar test work, and is not interfered by environmental factors; secondly, the first mechanical arm carries the radar to be tested to perform high-precision scanning test, the positioning precision is high, and the precise test can be realized; and because the microwave darkroom is provided with the feeding window, personnel do not need to enter and exit the microwave darkroom to replace the radar to be tested when batch testing is carried out, and the testing efficiency is high.

2. The utility model provides a radar test system is equipped with two first manipulators to can change the radar that awaits measuring from the material loading window in turn and test, can effectively improve efficiency of software testing, reduce the test cost of radar in research and development test and production test.

3. The utility model provides an among the radar test system, radio frequency test equipment includes a plurality of radio frequency devices, and a plurality of radio frequency devices can be switched by the second manipulator to switch different test types in a flexible way according to actual test demand, and can ensure the stability of radar test, avoid the test error that manual operation brought.

4. The utility model provides an among the radar test system, dispose laser calibration device on the first manipulator, by laser calibration device is supplementary to aim at the radio frequency device with the radar that awaits measuring, can further improve the positioning accuracy of first manipulator to realize the high accuracy test.

5. The utility model provides a radar test system adopts six manipulators as the driving piece of radar scan test, and it can be directional with the azimuth in nimble location coordinate position in three-dimensional space, can drive radar to be measured to optional position, arbitrary angle with high accuracy to carry out omnidirectional scan test to the radar that awaits measuring steadily, guarantee test data's accuracy.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a perspective view of a radar testing system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an internal structure of the radar testing system shown in FIG. 1;

FIG. 3 is a schematic diagram of an internal structure of the radar testing system shown in FIG. 1 from another angle;

fig. 4 is a schematic view of an internal structure of the radar testing system shown in fig. 1 from a top view.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

It will be understood by those within the art that, unless expressly stated otherwise, the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 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 or intervening elements may also be present. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

Fig. 1 to fig. 4 show jointly the utility model provides a radar test system 1000, this system are applicable to the radiation parameter measurement and the demarcation of high-accuracy microwave, millimeter wave antenna, can satisfy the research and development test and the production test demand of the supplementary radar complete machine of car, provide the required dead space environment of all-weather calibration test to can realize the radar parametric test of high accuracy and efficient.

Specifically, the radar test system 1000 comprises a microwave darkroom 1, a first mechanical arm 2 and a radio frequency test device 3, the first manipulator 2 and the radio frequency test device 3 are electrically connected and both arranged in the microwave darkroom 1, the first manipulator 2 is used for installing a radar to be tested (not shown, the same below), the radar to be tested is electrically connected with the radio frequency test equipment 3 through the first manipulator 2 to form a signal link, and the radar to be tested can be driven by the first manipulator 2 to be aligned with the radio frequency testing equipment 3 to scan along a preset track, for example, the radar to be tested is driven to move along a hemispherical track, therefore, the radiation data of the radar to be tested is comprehensively collected through the radio frequency test equipment 3, performance parameters such as a directional diagram, gain and the like of the radar to be tested are obtained through analysis and calculation of the radio frequency test equipment 3, and performance test of the radar to be tested is completed.

Preferably, the microwave darkroom 1 is provided with a first shielding door 111 capable of being automatically opened and closed on a side wall close to the first manipulator 2, the first shielding door 111 is used as a feeding window of the first manipulator 2, and the first manipulator 2 can be automatically opened and extended out of the microwave darkroom 1 to replace the radar to be measured when necessary. Therefore, when batch test work is carried out, personnel do not need to enter and exit the microwave darkroom 1 to replace the radar to be tested, and the test efficiency is higher.

In this embodiment, since a large-scale radar test is not required, in order to save cost, the replacement operation of the radar to be tested can be implemented by manually completing the detachment and installation process by an operator outside the microwave darkroom 1 after the first manipulator 2 extends out of the microwave darkroom 1. In other embodiments, a feeding manipulator may be disposed outside the microwave darkroom 1 at a position corresponding to the first shielding door 111, so that the radar to be tested is automatically replaced through the feeding manipulator, and the radar testing efficiency is further improved. Secondly, a corresponding conveying pipeline can be arranged according to requirements to transmit a plurality of radars to be tested and tested radars, and full-automatic and intelligent radar testing is achieved.

As shown in fig. 3 and 4, preferably, two first manipulators 2 are provided, which are arranged side by side in front of the first screen door 111. The radar test system 1000 tests the radar to be tested alternately through the two first manipulators 2, when one of the first manipulators 2 carries the radar to be tested to perform test operation, the other first manipulator 2 can complete the replacement operation of the radar to be tested at the first shielded gate 111, namely, the two first manipulators 2 can alternately replace the radar to be tested from the first shielded gate 111 to perform test, so that the test efficiency is further improved, and the test cost of the radar in research, development, test and production test is reduced.

In other embodiments, more first manipulators 2 may be provided, and the specific number of the first manipulators may be adjusted according to the space size of the anechoic chamber 1, the performance of the radio frequency test equipment 3, the test quantity requirement of the radar, and the like. Accordingly, the number of the first shield doors 111 may also be increased according to the increase of the number of the first manipulators 2, and is not limited to only one.

Preferably, the first manipulator 2 is a six-axis manipulator, which can flexibly position a coordinate position and orient an azimuth in a three-dimensional space, and can drive the radar to be tested to any position and any angle with high precision, so that the radar to be tested can be stably subjected to omnibearing scanning test, and the accuracy of test data is ensured.

Furthermore, the inside of the rotary joint of the first manipulator 2 is of a hollow structure, slip rings are added at each joint to connect radio frequency cables of the first manipulator into a coupling rotary structure (or a communicated rotary body), so that the butt joint transmission of radio frequency signals is realized, the radio frequency cables can rotate 360 degrees in the shaft, and the problems of distortion, unstable signal transmission, cable damage, aging and the like cannot occur.

Preferably, a laser calibration device (not shown, the same applies below) is configured on the first manipulator 2, and the first manipulator 2 can be positioned in real time with the aid of the laser calibration device, so that the radar to be tested can be more accurately aligned to the radio frequency test equipment 3 for testing. Specifically, the laser calibration device is composed of a laser, a photoreceptor and a corresponding computing circuit.

The radio frequency test equipment 3 comprises a second manipulator 31, a radio frequency device 32 which is arranged on the second manipulator 31 and can be driven by the second manipulator 31 to align to the radar to be tested, and a radio frequency test instrument 33 which is electrically connected with the radio frequency device 32. The radio frequency test instrument 33 is a complete radio frequency test closed loop consisting of a network analyzer or equivalent signal source and spectrum analyzer equipment, as well as cable assemblies and other related radio frequency accessories. The cable assembly can adopt a high-frequency cable to cover a frequency range of 71-86 GHz, and the cable assembly is wider in applicability.

Preferably, the radio frequency devices 32 are multiple, and specifically may include a standard gain horn antenna and three corner reflectors of different RCS, and the multiple radio frequency devices 32 may be respectively driven by the second manipulator 31 to align to the radar to be tested, so as to flexibly switch different test types according to actual test requirements, for example, implement radar antenna measurement, RCS measurement, and the like, and can ensure radar test stability, and avoid test errors caused by manual operation. In other embodiments, other rf devices 32 may be configured according to different testing requirements.

Radio frequency testing for radar may include the following types: 1) performing single-pass EIRP test by adopting a DUT (device under test), a receiving loudspeaker, a radio frequency cable, a spectrum analyzer and other equipment; 2) performing a two-pass target test by adopting a DUT (device under test), a corner reflector and other equipment; 3) testing the resolution of the double-pass angle by adopting devices such as a DUT (device under test), a guide rail, a double-corner reflector and the like; 4) target simulation test, which adopts equipment such as a radar simulator, a radio frequency cable, a transmitting loudspeaker, a DUT and the like; 5) and (4) performing noise floor test, wherein only the DUT participates in the test, and other equipment is subjected to silent processing.

Specifically, the EIRP may reflect the power of the signal emitted by the radar during operation, and the test may be performed by using instruments such as a spectrum analyzer, and may be performed by using a far-field or compact-field test method. Secondly, because the test is carried out in a wireless environment, the space propagation loss is large, the actual received signal intensity is low, and an analysis instrument is required to be provided with an external preposed low-noise amplifier or an internal amplifier selection piece. In an actual radar test, because the waveform parameters of actual transmission signals of radars of different manufacturers are different, in a working state of the radar, the signal parameters can also change based on different working scenes or tasks, and therefore a corresponding frequency spectrum test method needs to be adopted according to actual conditions.

For the test of different parameters, the following methods can be respectively adopted:

(1) testing of radar emission sine wave signals: the radar to be tested is set in a sine wave transmitting working state through the radar upper computer, and then the signal power is tested through the frequency spectrum working mode of the microwave signal analyzer.

(2) Testing of radar emission complex modulation signals: the radar to be tested can work in a complex modulation signal state, then the vector analysis function of the microwave signal analyzer is used for receiving radar emission signals, and the power parameters of the complex signals are tested by using the FFT (fast Fourier transform) test function. The frequency range of the analysis meter needs to cover the highest frequency output by the radar, and the analysis bandwidth needs to be larger than the bandwidth of the output signal of the radar.

(3) Testing the flatness of the radar emission peak power and the output signal power: the radar to be tested can work in a complex modulation signal state, a vector analysis function of a microwave signal analyzer is used for receiving a radar transmitting signal, and a power Time domain (Time) test function is used for testing the power parameter of the complex signal. The frequency range of the analysis meter needs to cover the highest frequency output by the radar, and the analysis bandwidth needs to be larger than the bandwidth of the output signal of the radar.

Referring to fig. 1 and 4, the anechoic chamber 1 includes a shielding chamber 11 made of a metal material and a wave-absorbing material 12 attached in the shielding chamber 11 to reduce signal reflection as much as possible, and the anechoic chamber 1 simulates a free space environment, so that all-weather radar testing work can be realized without interference of external environmental factors. Secondly, the microwave darkroom 1 can also effectively prevent the interference of external electromagnetic waves, so that the internal test operation is not influenced by the external electromagnetic environment, and the internal test signals can also be prevented from radiating outwards to form an interference source, thereby avoiding polluting the surrounding electromagnetic environment and ensuring that each test device can work normally.

Preferably, the shielding chamber 11 can be assembled by 2mm galvanized steel plates, the two mutually connected galvanized steel plates are assembled by a bolt with a hole distance of 75mm, a galvanized copper net can be filled between the galvanized steel plates to ensure no electromagnetic leakage, and the plate seams are connected with the plate seams in a staggered manner to improve the sealing performance of the joints. Secondly, the galvanized steel sheet has excellent shielding performance and longer service life, so that the performance of the microwave darkroom 1 is ensured, and the microwave darkroom 1 has longer service life, and is more advanced and reliable.

Preferably, the wave-absorbing material 12 is made of foam material, and is mainly pyramid-shaped wave-absorbing material 121, so that reflection inside the shielding chamber 11 is extremely small, and free space can be well simulated. Through research, when the ratio d/lambda of the thickness of the wave-absorbing material 12 to the wavelength of the incident wave of the signal is 0.25, 1, 2.5, and 8, respectively, the reflection attenuation of the vertical incidence is: -20dB, -30dB, -40dB, -50dB (the actual test index of the material can reach-45 dB at more than 5G and can reach-50 dB at more than 10G). Therefore, part of the wall surface of the shielding chamber 11 corresponding to the first manipulator 2 and the rear part of the radio frequency testing device 3 is used as a main reflection area with the largest influence on the quiet zone performance, and the 500mm high conical wave-absorbing material 121 can be laid to meet the quiet zone performance. In the fresnel region (between the transmitting and receiving antennas, an ellipsoid formed by a break point with a stroke difference of n λ/2 between a linear path and a broken line path of an electric wave and taking the position of the transmitting and receiving antennas as a focus and the linear path as an axis) in the middle of the top and the bottom of the shielding chamber 11, and the side walls of two continuous sides of the first manipulator 2 and the radio frequency testing equipment 3 can be paved with the pyramid-shaped wave-absorbing material 121 with a height of 500mm, and the pyramid-shaped wave-absorbing material 121 with a height of 200mm can be paved on the rest wall surface positions, so that the testing environment requirements of the radar can be met.

The microwave darkroom 1 is further provided with a second shielding door 112 for personnel and test equipment to enter and exit. Correspondingly, the wave-absorbing material 12 further includes a flat-plate type wave-absorbing material 122, the flat-plate type wave-absorbing material 122 is laid at the bottom of the shielding chamber 11 and forms a walkway connecting the second shielding door 112, the first manipulator 2 and the radio frequency testing equipment 3, and the width of the walkway can be set to 500mm, so that personnel and testing equipment can conveniently enter and exit the anechoic chamber 1.

Preferably, the corners inside the shielding chamber 11 may be laid by combining the flat-plate-type corner material and the oblique-wedge-type wave-absorbing material.

In order to ensure the safety of the microwave darkroom 1, auxiliary devices such as a lighting device, an exhaust device, a smoke alarm device, a video monitoring device and the like are also arranged in the microwave darkroom 1.

Further, the radar test system 1000 further includes a servo control box 5 electrically connected to the first manipulator 2, and the first manipulator 2 is driven by the servo control box 5.

Preferably, the servo control box 5 and the radio frequency test instrument 33 are both arranged outside the anechoic chamber 1, so that the internal environment of the anechoic chamber 1 is ensured to be free from interference, and the influence on the accuracy of radar test data due to excessive equipment arranged in the anechoic chamber 1 is avoided.

Further, still be equipped with a plurality of cable interfaces 113 on the anechoic chamber 1, servo control box 5 can adopt the cable to pass through cable interface 113 with first manipulator 2 electricity is connected, radio frequency test instrument 33 can adopt the cable to pass through cable interface 113 with radio frequency device 32 electricity is connected.

As shown in fig. 1, the radar test system 1000 further includes a display and control device 4 electrically connected to the radio frequency test device 3 and disposed outside the microwave darkroom 1, where the display and control device 4 is configured to control each device and display related data in real time. Specifically, the display and control device 4 at least includes a display panel 41 and a control keyboard 42, so that a tester can control the operation of the system and observe test data, statistical data and the like in real time.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a radar test system, its characterized in that includes the microwave darkroom, all locates radio frequency test equipment and first manipulator in the microwave darkroom, radio frequency test equipment with first manipulator electricity is connected, first manipulator is used for the installation radar that awaits measuring and can drives the radar that awaits measuring is aimed at radio frequency test equipment is along predetermineeing the orbit scanning, the microwave darkroom is equipped with the confession first manipulator stretches out the material loading window of changing the radar that awaits measuring.

2. The radar testing system of claim 1, wherein the first manipulator is provided with at least two, which are arranged side by side in front of the loading window and can alternately replace the radar to be tested from the loading window for testing.

3. The radar testing system of claim 1, wherein the loading window is configured as an automatically openable and closable first screen door.

4. The radar test system of claim 1, wherein the radio frequency test equipment comprises a second manipulator, a plurality of radio frequency devices respectively arranged on the second manipulator and driven by the second manipulator to be aligned with the radar to be tested, and a radio frequency analyzer electrically connected to the plurality of radio frequency devices.

5. The radar testing system of claim 4, wherein the radio frequency devices comprise a standard gain horn antenna and three corner reflectors of different RCS.

6. The radar testing system of claim 1, further comprising a laser alignment device disposed on the first manipulator for assisting the first manipulator in aligning a radar under test with the radio frequency testing equipment.

7. The radar testing system of claim 1, wherein the first manipulator is a six-axis manipulator.

8. The radar testing system of claim 1, wherein the anechoic chamber comprises a shielding chamber made of a metal material and a wave-absorbing material attached to the inside of the shielding chamber.

9. The radar test system according to claim 8, wherein the anechoic chamber is further provided with a second shielding door for personnel to enter and exit, the wave-absorbing material comprises a conical wave-absorbing material and a flat wave-absorbing material, the flat wave-absorbing material is laid at the bottom of the shielding chamber and forms a walkway for connecting the second shielding door, the first manipulator and the radio frequency test equipment, and the conical wave-absorbing material is laid at a position where the side wall, the top and the bottom of the shielding chamber are not covered by the flat wave-absorbing material.

10. The radar testing system of claim 1, further comprising a display and control device disposed outside the microwave chamber and electrically connected to the radio frequency testing device.