CN214503759U - Antenna test system - Google Patents
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- CN214503759U CN214503759U CN202021922508.4U CN202021922508U CN214503759U CN 214503759 U CN214503759 U CN 214503759U CN 202021922508 U CN202021922508 U CN 202021922508U CN 214503759 U CN214503759 U CN 214503759U
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Abstract
The utility model relates to an antenna test system, including auxiliary antenna, radio frequency system, servomechanism and industrial control system, the radio frequency system is used for providing radio frequency signal and transmitting the signal transmission that the receiving antenna intercepted to test equipment to auxiliary antenna and the transmitting antenna in the antenna that awaits measuring; the radio frequency system combines a signal source and a spectrometer, and the test frequency band covers 0.1-110 GHz.
Description
Technical Field
The utility model belongs to the technical field of communication and specifically relates to an antenna test system.
Background
The antenna is the core of information transmitting and receiving of modern military or civil communication and investigation equipment, and no matter mobile communication, satellite communication, radar, seeker, jammer, friend or foe identification system and the like, the antenna can not be separated from various antennas. In recent years, with the breakthrough of technology, process and material science, the antenna has been greatly developed as an important component of communication and radar, a plurality of novel antennas, antenna arrays and antenna array surfaces are developed, the performance indexes of directivity, zero depth, gain and the like are greatly improved, and new technologies of multi-beam, random beam, beam shaping and the like are developed, so that very high requirements are provided for the test equipment of the antenna and the corresponding test technology. The design and manufacturing technology and the testing technology of the antenna have become the core and the key for developing the antenna industry, and the development, production and performance evaluation of the antenna cannot be separated from the antenna testing system. The existing far-field test system adopts a signal source and a spectrometer test framework, and the frequency band is generally lower than 40 GHz; the servo mechanism used by the existing far-field test system is inconvenient for testing the phase center of the antenna.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides an antenna test system, solves current far field test system frequency channel and generally is less than 40GHz scheduling problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an antenna test system comprises a test field subsystem, a radio frequency system and an industrial control system; the test field subsystem configures the auxiliary antenna and the antenna to be tested into a transmitting antenna and a receiving antenna; the radio frequency system provides radio frequency signals for the transmitting antenna or transmits signals intercepted by the receiving antenna to the test equipment; the antenna test system also comprises a servo mechanism for installing and adjusting the antenna to be tested and/or the auxiliary antenna; the industrial control system controls the servo mechanism to work; the test equipment comprises a frequency spectrograph; the radio frequency system of the antenna test system combines a signal source and a frequency spectrometer, and the test frequency band covers 0.1-110 GHz.
Further, the antenna test system is a far-field test system; the servo mechanism comprises a multi-axis industrial robot and/or a servo turntable, and the industrial control system controls the multi-axis industrial robot and/or the servo turntable to carry an antenna to be tested or an auxiliary antenna to realize the movement or rotation of a preset position, an angle and a track; the multi-axis industrial robot is preset with a motion track of one or more virtual azimuth axes, and the multiple axes of the robot are matched with a carrying antenna to complete the motion track, so that the phase center position of the antenna is obtained; the servo turntable can carry the antenna to traverse all 360-degree directions; the multi-axis industrial robot is a six-axis industrial robot.
Furthermore, the servo mechanism comprises a transmitting end servo mechanism and a receiving end servo mechanism; the transmitting end servo mechanism adopts the multi-axis industrial robot as a ground transmitting antenna servo turntable, has height motion path adjustment, and can realize the movement of any position, any angle and any track; the receiving end servo mechanism comprises a servo turntable which can drive the receiving antenna to traverse all 360-degree directions; the servo turntable carries the antenna to traverse all 360-degree directions so as to realize the direction reading of one polarization plane of the antenna; the servo rotary table is a three-axis servo rotary table; the servo turntable adopts a rotary joint at the shaft connecting part, and a signal of a radio frequency system passes through the rotary joint and then is transmitted to test equipment through a radio frequency cable; the auxiliary transmission is configured as a transmit antenna; the antenna under test is configured as a receiving antenna.
Further, a receiving end radio frequency link; the transmitting end radio frequency link is connected with the transmitting antenna and provides radio frequency signals for the transmitting antenna; the transmitting end radio frequency link comprises a signal source; the receiving end radio frequency link comprises a radio frequency circuit and a test device, and the test device comprises the frequency spectrograph; the receiving end radio frequency link is connected with the receiving antenna and sends the electromagnetic waves intercepted by the receiving antenna back to the frequency spectrograph; the industrial control system comprises a sampling control subsystem: the sampling control subsystem comprises a servo control subsystem for controlling the movement and rotation of the servo mechanism to realize the positioning and scanning of the specific position of the probe; the sampling control subsystem also comprises a reading function module which is used for reading the reading of the frequency spectrograph; the sampling control subsystem also comprises a synchronization module which is used for triggering the test equipment to realize the data reading of the radio frequency link after the servo mechanism is positioned; the sampling control subsystem is implemented by one or more computer devices or industrial computers.
The industrial control system also comprises a data processing subsystem: the data processing subsystem comprises a processor and a memory and is used for at least one of data packaging, transmission, analysis, data preprocessing and storage functions; the data processing subsystem is implemented by one or more computer devices.
The industrial control system further comprises a display subsystem: the display subsystem is used for at least one of direct display, two-dimensional drawing, envelope addition and graphic display of data and data derivation functions; the display subsystem is a display screen or other terminal with a display function.
In some embodiments, the transmitting end radio frequency link and the receiving end radio frequency link further comprise a spreading module, the spreading module comprising a frequency multiplier and a harmonic mixer; the local oscillation signal input into the harmonic mixer is provided by an independent signal source or a local oscillation integrated in the frequency spectrograph.
In some embodiments, for microwave band signals, the transmitting end radio frequency link directly uses the signal source to drive the transmitting antenna to generate transmitting microwave signals; the transmitting antenna adopts a high-gain horn antenna or a parabolic antenna to form a narrower wave beam; the receiving antenna is an antenna to be tested; the radio frequency link of the receiving end directly adopts a coaxial cable or a radio frequency cable to send the electromagnetic waves intercepted by the receiving antenna back to the frequency spectrograph to read the loop gain value of the current link.
In some embodiments, the transmitting end radio frequency link comprises a signal source and a spread spectrum module; the signal output by the signal source is spread by the spread spectrum module and then transmitted by the transmitting antenna; the transmitting end spread spectrum module comprises frequency multiplication; the signal of the signal source is output to a transmitting antenna after frequency multiplication and frequency spreading; the receiving end radio frequency link comprises a harmonic mixer, an independent signal source or the frequency spectrograph integrated with a local oscillator and a duplexer; the signal intercepted by the receiving antenna and the local oscillator signal are accessed into a harmonic mixer combiner, and the intermediate frequency signal after frequency conversion of the mixer is combined with the local oscillator signal through a duplexer and sent to a frequency spectrograph for testing.
In some embodiments, for millimeter wave band signals: a spread spectrum module of a transmitting end radio frequency link adopts 6-frequency multiplication, a signal source outputs 11.83-14.33 GHz signals, and the transmitting end radio frequency link outputs 60-90 GHz transmitting signals; 6, the frequency multiplication is carried out by a 12V power supply; the radio frequency system adopts a spread spectrum module to realize the transmission and the reception of millimeter waves of 40-110 GHz; the local oscillator signal frequency is 8.875-10.75 GHz; the local oscillation signal frequency inserts a plurality of stages of radio frequency amplifiers at the tail end so as to provide enough local oscillation power amplitude for the frequency mixer; and the radio frequency link of the receiving end adopts an 8-frequency multiplication harmonic mixer.
In some embodiments, the output end of the radio frequency link at the transmitting end outputs a transmitting signal of 60-90 GHz, and the transmitting signal is transmitted to the space through a transmitting antenna; a receiving end radio frequency link adopts a duplexer to divide a local oscillation signal and an intermediate frequency signal into an upper path and a lower path, wherein the local oscillation signal is amplified by a two-stage driving amplifier and then is transmitted to a harmonic mixer; the local oscillation signal is amplified and then transmitted to a harmonic mixer through another duplexer; the intermediate frequency signal is mixed by 8 times of the central signal received by the receiving antenna and the local oscillation signal to generate an intermediate frequency, and the intermediate frequency signal is transmitted to a rotary joint of the servo turntable through a duplexer and then is sent to the frequency spectrograph; the amplification link has-4 dB attenuation; the antenna test system obtains one or more of the directional coefficient and gain, half-power lobe width, zero point position, any level lobe width, each side lobe position and corresponding level value parameters of the antenna to be tested.
Further, the dynamic range of each test frequency band of the antenna test system is 67-123; under the condition of far-field distance, the maximum size of the antenna which can be measured corresponds to 500-4000 mm.
The utility model has the advantages that:
the utility model discloses use conventional signal source and spectrometer test method, automatic acquisition test data generates the antenna directional diagram. The conventional antenna testing capability covers 0.1-40 GHz, and the use of the spread spectrum equipment can be expanded to 110 GHz.
The utility model discloses an antenna test system adopts multiaxis industrial robot as antenna servo, has high motion path controllability, can control the setting that the robot realized arbitrary route, optional position and arbitrary angle, has high degree of freedom, can conveniently set up arbitrary virtual rotation axis, realizes the test at antenna phase place center.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic view of an external field test system of a slant-range antenna according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an antenna testing system module according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the position of the antenna phase center according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of an operating state of a six-axis servo mechanism according to an embodiment of the present invention, in which an antenna is carried around a virtual axis.
Fig. 5 is a schematic diagram of an operating state of the servo turntable carrying antenna according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a microwave band rf link according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a millimeter wave band radio frequency link according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of a millimeter wave band radio frequency link according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of a receiving end radio frequency link in a millimeter wave band according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present invention, features of various embodiments and embodiments can be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
The ideal antenna test field is a necessary condition for accurately measuring the antenna, and the design premise is to meet the requirement of the minimum test distance, simulate the real test free space, and avoid the influence of the echo generated by objects and the environment around the test field on the test as far as possible, so that the electromagnetic wave radiated by the transmitting antenna can be uniformly scattered to the receiving antenna. The elevated antenna test field is a common outdoor antenna test field, which utilizes the directivity and reasonable erection height of a transmitting antenna to ensure that the reflected clutter has very little influence on the test precision, generally, a receiving antenna and a transmitting antenna are erected on a cement tower or the top of an adjacent tall building to avoid the influence caused by ground reflected waves, the receiving antenna and the transmitting antenna are erected at different heights and are inclined antenna test fields, a receiving antenna to be tested can be erected on a higher non-metal tower, an auxiliary transmitting antenna is erected on the ground, the height and elevation angle of the transmitting antenna are adjusted to ensure that the phase centers of the transmitting antenna and the receiving antenna are aligned and the zero radiation direction is aligned to the ground, and then the ground reflection can be effectively inhibited; or a special iron tower can be adopted to erect the transmitting antenna, and the antenna to be tested is placed at a low position as a receiving antenna.
The utility model discloses antenna test system can be used as outdoor antenna far field measurement system, and under industrial computer (industry control system promptly) control, realize that data gather, data analysis and full-automatic, high accuracy aerial survey. The computer is connected with the instrument through a standard interface, and then the setting of parameters such as emission source frequency, output frequency, working mode and the like is completed. The utility model discloses a system, signal source 4 transmits the electromagnetic wave through transmitting antenna 5. The receiving antenna 6 is controlled by the industrial control subsystem to rotate by the servo mechanism and coordinate the servo rotation of the system, so as to synchronously read the intensity of the received signal, obtain the measurement result of the parameters of the antenna far zone in real time, and further obtain a series of parameters such as the antenna direction coefficient and gain, half-power lobe width, zero point position, any level lobe width, each side lobe position and corresponding level value. And realize the quick analysis, display, storage and printing of antenna parameter.
In an embodiment, referring to fig. 1-9, the present invention provides an antenna testing system, which can be used for an outdoor far-field antenna testing system, and mainly includes a testing field subsystem, a servo mechanism, a radio frequency system, and an industrial control system. The test field subsystem mainly includes the transmitting and receiving antennas 5, 6. The servo mechanism comprises a transmitting end servo mechanism for carrying and adjusting the transmitting antenna 5 and a receiving end servo mechanism for installing and adjusting the receiving antenna 6, and can adopt a robot, for example, the transmitting end servo mechanism adopts a multi-axis industrial robot 1, and the receiving end servo mechanism adopts a servo turntable 2, so that the free adjustment and the matching of the positions of the transmitting and receiving antennas are realized, and the signal test of each position is realized. The radio frequency system is used for providing radio frequency signals to the transmitting antenna or receiving radio frequency signals from the receiving antenna and carrying out measurement. The industrial control system comprises computer equipment for controlling the servo mechanism and/or the radio frequency system to work, the antenna test system realizes data acquisition, data analysis and full-automatic and high-precision antenna measurement under the control of the industrial personal computer, and the computer equipment can be connected with an instrument through a standard interface so as to complete the setting of parameters such as emission source frequency, output frequency, working mode and the like. The utility model discloses a radio frequency system uses conventional signal source 4 and spectrometer test method, and the cooperation industrial control system acquires test data, generates the antenna directional diagram. The conventional antenna testing capability covers 0.1-40 GHz, and the use of the antenna testing device combined with the spread spectrum equipment can be expanded to 110 GHz.
The test field subsystem includes an antenna to be tested and an auxiliary test antenna, which are used as a transmitting antenna and a receiving antenna, and can be configured (but not limited to) that the auxiliary test antenna is used as a transmitting antenna 5 and the antenna to be tested is used as a receiving antenna 6. As an outdoor far-field test system, a transmitting antenna 5, generally a high-gain antenna, is placed on the ground; a receiving antenna 6, typically an antenna under test DUT or AUT, is placed above the tower as shown in fig. 1. Under the general condition, the receiving antenna is higher than the transmitting antenna, and reflectors do not exist around the receiving antenna, so that the electromagnetic wave of the transmitting antenna is transmitted in an inclined upward direction, multipath radiation receiving caused by reflection of objects around the receiving antenna is avoided, and the accuracy of the test can be effectively ensured. In a specific example, the transmitting antenna 5 may be a high-gain horn antenna or a parabolic antenna, and forms a narrower beam. Under the condition that the surrounding environment of the transmitting antenna 5 is complex or the sidelobe back lobe is high, wave absorbing materials can be arranged around the antenna. The receiving antenna 6 is an antenna to be tested, and is generally erected at a high position, and has no reflector at the periphery.
The servo mechanism comprises a transmitting end servo mechanism and a receiving end servo mechanism which are respectively used for bearing or carrying the transmitting antenna and the receiving antenna to move or rotate according to a preset position, an angle or a track so as to meet the requirement of a test position. Referring to fig. 1 and 4, a servo mechanism of the antenna testing system adopts a multi-axis, preferably six-axis industrial robot 1, which has a high motion path programmability, can control the robot to realize the setting of any path, any position and any angle, has a high degree of freedom, can conveniently set any virtual rotation axis, and realizes the testing of an antenna phase center C.
In the specific embodiment, the transmitting end servo mechanism adopts the high-precision industrial six-axis robot 1 as a ground transmitting antenna servo turntable, has a high-motion path programmable function, and greatly meets the requirement of test diversity. The six-axis industrial robot 1 can carry the auxiliary test antenna 5 to move in the solid angle of the upper half space with high precision, and has extremely high freedom of movement. Six axes of the robot arm are S (base, rotation), L (lower arm, swing), U (upper arm, swing), R (wrist, rotation), B (wrist, swing), T (flange, swing), respectively, and depending on the motions of these six axes, the motion terminal of the robot arm can be accurately moved to any position and any angle of the scanning space.
The six-axis servo robot can realize the movement of any position, any angle and any track of a flange carrying object, and is particularly suitable for being used as a servo mechanism for antenna test.
In the test scenario of the antenna phase center C shown in fig. 2, the antenna phase center C is a virtual phase center point, and may appear at any position of the physical structure of the antenna, and may even appear outside the antenna. The traditional phase center testing method needs to manually move the installation position of the antenna on the servo turntable, and the phase center of the antenna can be found only when the phase center of the antenna is coaxial with the azimuth axis. Therefore, it is necessary to design a complicated antenna jig and manually adjust the mounting position of the antenna many times. By adopting the six-axis servo robot, a complex fixture does not need to be manufactured, the six-axis robot can realize the rotating track around the virtual azimuth axis, as shown in fig. 3, the rotation of the azimuth axis needs six axes to be matched together to complete the track, and the coordinate of the virtual azimuth axis can be preset, so that the positions of a plurality of virtual axes are preset, a plurality of tests are automatically executed, and the phase center position of the antenna can be conveniently obtained.
Referring to fig. 1 and 5, a receiving end servo mechanism adopts a conventional large three-axis servo turntable 2, the turntable can carry 300kg of load, and the moment arm is 1 m; the device is divided into three shafts, namely a lower azimuth shaft 22, a pitching shaft 23, an upper azimuth shaft 24 and the like, the rotating speed is 0.1-3 m/s, the rotating and positioning accuracy is less than 0.02 degrees, and the angular resolution is less than 0.01 degrees. The rotary joint 20 is connected at its distal end to an antenna holder 26, and the antenna holder 26 is supported by a polarization shaft 25. In specific operation, the receiving end servo mechanism rotates, and the carried antenna can traverse all 360-degree directions, so that the reading of the direction of one polarization plane of the antenna can be realized. Because the receiving rotary table 2 needs to rotate by 360 degrees, in order to prevent winding, the receiving rotary table 2 adopts a rotary joint 20 at the upper azimuth axis connection position, and signals pass through the rotary joint 20 and then are transferred into the indoor testing equipment 7 through a long cable 21.
Referring collectively to fig. 6-9, the radio frequency system includes a transmitting end radio frequency link 40 and a receiving end radio frequency link 70. The transmitting end radio frequency link 40 is connected to the transmitting antenna 5 and supplies radio frequency signals to the transmitting antenna, and the transmitting end radio frequency link 40 includes the signal source 4. The receiving rf link 70 comprises an rf line and a test device 7 comprising a radio frequency instrument, preferably a spectrometer. The receiving end rf link 70 is connected to the receiving antenna 6, and sends the electromagnetic waves intercepted by the receiving antenna 6 back to the spectrometer. The transmitting end rf link 40 and the receiving end rf link 70 may further include a spreading module, which may include a frequency multiplier and a harmonic mixer, specifically configured according to the band of the signal.
Antenna test systems typically employ a combination of a signal source and a spectrometer to build a complete radio frequency link. Referring to fig. 6, for microwave band signals, the transmitting end radio frequency link 40 is directly driven by the signal source 4, the transmitting antenna 5 preferably adopts a high-gain horn antenna or a parabolic antenna to form a narrower beam, and a wave-absorbing material can be arranged around the antenna under the condition that the surrounding environment of the transmitting antenna 5 is complex or the sidelobe back lobe is higher. The receiving antenna 6 is an antenna to be tested and is erected at a high place, and no reflector is arranged on the periphery. The electromagnetic wave intercepted by the receiving antenna 6 is directly sent back to the spectrometer of the indoor testing equipment 7 by the receiving end radio frequency link 70, and the loop gain value of the current link is read. During testing, the receiving end servo mechanism is controlled to rotate, so that the receiving antenna 6 is driven to traverse all 360-degree directions, and the reading of the direction of one polarization plane of the antenna to be tested can be realized. The receiving turntable 2 adopts a rotary joint 20 at the upper position shaft connection part, and signals pass through the rotary joint 20 and then are transferred to the indoor testing equipment 7 through a long cable 21.
For millimeter wave band signals, a radio frequency system can adopt a spread spectrum module to realize a 40-110 GHz millimeter wave transmitting and receiving system. In the embodiment shown in fig. 7-9, a 60-90 GHz spread spectrum system is adopted, and specifically, the transmitting end rf link 40 includes a signal 4 and a spread spectrum module 41. The frequency spreading module 41 adopts 6-frequency multiplication, the signal source outputs 11.83-14.33 GHz, and the output end obtains a transmission signal of 60-90 GHz. The 6 times frequency is supplied by a 12V power supply. At the receiving end, the receiving end radio frequency link 70 adopts an 8-frequency multiplication harmonic mixer 71, wherein the local oscillator signal is provided by the indoor test equipment 7 and can be provided by an independent signal source or a local oscillator integrated spectrometer, the local oscillator signal frequency is 8.875 to 10.75GHz, and because the frequency is high and the loss through the radio frequency long line 21 is large, a plurality of stages of radio frequency amplifiers 72 are inserted at the tail end to provide enough local oscillator power amplitude for the mixer 71. The intermediate frequency signal after frequency conversion is combined with the local oscillator signal through the duplexer 73, and is sent to the frequency spectrograph through the common rotary joint 20 and the radio frequency long line 21 for power reading, so as to realize the closed loop test of the millimeter wave signal. In the embodiments shown in fig. 7 and 8, highly interchangeable examples of the installation of the transmitting antenna 5 and the receiving antenna 6 are applied to the test system for testing.
Referring to the specific example shown in fig. 9, for a 60-90 GHz antenna test spread spectrum system, the frequency of the spread spectrum module 41 of the transmitting end radio frequency link is adopted for the transmitting end radio frequency link 40 to be 6 times, the signal source outputs 11.83-14.33 GHz, the output end obtains a 60-90 GHz transmission signal, and the signal is transmitted to the space through the transmitting antenna 5.
In the receiving end radio frequency link 70, an 8-frequency doubling harmonic mixer 71 is adopted, wherein a local oscillator signal is provided by an indoor receiving device (test device) 7, the receiving device (test device) 7 can simultaneously output a local oscillator signal of 8.875 to 10.75GHz and input an intermediate frequency signal of 300MHz in the same line, the two signals are simultaneously transmitted in the same line, the local oscillator signal is output, and the intermediate frequency signal is input.
The coaxial cable connects the receiving device (test device) 7 and the rotary joint 20 inside the servo mechanism, a duplexer 73 is arranged behind the rotary joint 20, the duplexer 73 can separate the local oscillation signal and the intermediate frequency signal into an upper path and a lower path, wherein the local oscillation signal goes to the lower path, is amplified by the two-stage driving amplifier 72 and then is transmitted to the harmonic mixer 71, and the amplifying link is attenuated by-d 4B. The amplified local oscillator signal may be fed to the harmonic mixer 71 via a further duplexer 73'. The intermediate frequency signal is received by the receiving antenna, after mixing the 60-90GH center signal with 8 times of the local oscillator signal (frequency subtraction: RF-8LO), the generated intermediate frequency (for example 322MHz) of about 300MHz is passed through the duplexer 73', the intermediate frequency signal goes up the way, is transmitted to the right, is synthesized by the duplexer 73, and is sent to the receiving device 7 through the rotary joint.
The receiving device 7 comprises an independent signal source or a local oscillator integrated spectrometer, the local oscillator signal frequency is 8.875 to 10.75GHz, and because the frequency is high and the loss through the radio frequency long line is large, a plurality of stages of radio frequency amplifiers 72 are inserted between the duplexer 73 and the mixer 71, and then the sufficient local oscillator power amplitude can be provided for the mixer 71.
The millimeter wave test principle of other frequency bands is the same, but a frequency multiplier and a harmonic mixer of the corresponding frequency band are required to be selected.
The dynamic range of the system is shown in table 1, wherein the spatial loss is calculated according to 200m, the receiving and transmitting antennas all use 30dB gain as an example, and the maximum values of the received signals of the antenna link in different frequency bands, the sensitivity of the spectrometer and the dynamic range coverage of each frequency band are calculated to be 67-123 (the dynamic range measures the capability of the antenna test field for measuring low-amplitude side lobes and back lobes). The maximum size of the antenna that can be measured is 500-.
TABLE 1 dynamic Range of the System
The industrial control system comprises a sampling control subsystem, a data processing subsystem and a display subsystem. The sampling control subsystem comprises a servo control subsystem, a radio frequency link reading function module and a synchronization module for coordinating an antenna servo mechanism (namely a rotary table) and a test instrument to synchronously work. The servo control subsystem is used for controlling the movement and rotation of the servo mechanism to realize the positioning and scanning of the specific position of the probe, and once the positioning of the servo mechanism is finished, the synchronous module triggers the test equipment 7 to realize the data reading of the radio frequency link. The data processing subsystem comprises a processor and a memory and is used for functions of data packaging, transmission, analysis, data preprocessing, storage and the like. The display subsystem includes functions of direct display of data, two-dimensional drawing, envelope addition, illustration and data derivation. The control subsystem and the data processing subsystem can be realized by one or more computer devices, and the display subsystem can be a display screen or a terminal with a display function, and the like.
The main equipment of the transmitting end is a six-axis servo robot 1, the robot is required to be controlled to carry a test antenna to point to the receiving end during testing, the servo control subsystem controls the servo mechanism of the transmitting end by adopting an upper computer, single-axis control is realized to align a receiving and transmitting connecting line, after alignment, the position can be automatically recorded, and later alignment can be directly called without repeated setting.
The industrial control of the receiving end comprises post-processing functions of receiving end servo mechanism control, radio frequency instrument control, data display control and the like.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and are intended to be within the scope of the invention; the scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An antenna test system comprises a test field subsystem, a radio frequency system and an industrial control system; the test field subsystem configures the auxiliary antenna and the antenna to be tested into a transmitting antenna and a receiving antenna; the radio frequency system provides radio frequency signals for the transmitting antenna or transmits signals intercepted by the receiving antenna to the test equipment; the antenna test system is characterized by also comprising a servo mechanism for installing and adjusting the antenna to be tested and/or the auxiliary antenna; the industrial control system controls the servo mechanism to work; the test equipment comprises a frequency spectrograph; the radio frequency system of the antenna test system combines a signal source and a frequency spectrometer, and the test frequency band covers 0.1-110 GHz.
2. The antenna test system of claim 1,
the antenna test system is a far-field test system;
the servo mechanism comprises a multi-axis industrial robot and/or a servo turntable, and the industrial control system controls the multi-axis industrial robot and/or the servo turntable to carry an antenna to be tested or an auxiliary antenna to realize the movement or rotation of a preset position, an angle and a track;
the multi-axis industrial robot is preset with a motion track of one or more virtual azimuth axes, and the multiple axes of the robot are matched with a carrying antenna to complete the motion track, so that the phase center position of the antenna is obtained;
the servo turntable can carry the antenna to traverse all 360-degree directions;
the multi-axis industrial robot is a six-axis industrial robot.
3. The antenna test system of claim 2,
the servo mechanism comprises a transmitting end servo mechanism and a receiving end servo mechanism;
the transmitting end servo mechanism adopts the multi-axis industrial robot as a ground transmitting antenna servo turntable, has height motion path adjustment, and can realize the movement of any position, any angle and any track;
the receiving end servo mechanism comprises a servo turntable which can drive the receiving antenna to traverse all 360-degree directions;
the servo turntable carries the antenna to traverse all 360-degree directions so as to realize the direction reading of one polarization plane of the antenna;
the servo rotary table is a three-axis servo rotary table; the servo turntable adopts a rotary joint at the shaft connecting part, and a signal of a radio frequency system passes through the rotary joint and then is transmitted to test equipment through a radio frequency cable;
the auxiliary antenna is configured as a transmit antenna; the antenna under test is configured as a receiving antenna.
4. The antenna test system of claim 1, wherein the radio frequency system comprises a transmit end radio frequency link and a receive end radio frequency link;
the transmitting end radio frequency link is connected with the transmitting antenna and provides radio frequency signals for the transmitting antenna; the transmitting end radio frequency link comprises a signal source;
the receiving end radio frequency link comprises a radio frequency circuit and a test device, and the test device comprises the frequency spectrograph; the receiving end radio frequency link is connected with the receiving antenna and sends the electromagnetic waves intercepted by the receiving antenna back to the frequency spectrograph;
the industrial control system comprises a sampling control subsystem:
the sampling control subsystem comprises a servo control subsystem for controlling the movement and rotation of the servo mechanism to realize the positioning and scanning of the specific position of the probe;
the sampling control subsystem also comprises a reading function module which is used for reading the reading of the frequency spectrograph;
the sampling control subsystem also comprises a synchronization module which is used for triggering the test equipment to realize the data reading of the radio frequency link after the servo mechanism is positioned;
the sampling control subsystem is realized by one or more computer devices or industrial personal computers;
the industrial control system also comprises a data processing subsystem:
the data processing subsystem comprises a processor and a memory and is used for at least one of data packaging, transmission, analysis, data preprocessing and storage functions;
the data processing subsystem is implemented by one or more computer devices;
the industrial control system further comprises a display subsystem:
the display subsystem is used for at least one of direct display, two-dimensional drawing, envelope addition and graphic display of data and data derivation functions;
the display subsystem is a display screen or other terminal with a display function.
5. The antenna test system of claim 4, wherein the transmitting end radio frequency link and the receiving end radio frequency link further comprise a spreading module, the spreading module comprising a frequency multiplier and a harmonic mixer;
the local oscillation signal input into the harmonic mixer is provided by an independent signal source or a local oscillation integrated in the frequency spectrograph.
6. The antenna test system of claim 4,
for microwave band signals, a transmitting end radio frequency link directly adopts a signal source to drive a transmitting antenna to generate transmitting microwave signals;
the transmitting antenna adopts a high-gain horn antenna or a parabolic antenna to form a narrower wave beam;
the receiving antenna is an antenna to be tested;
the radio frequency link of the receiving end directly adopts a coaxial cable or a radio frequency cable to send the electromagnetic waves intercepted by the receiving antenna back to the frequency spectrograph to read the loop gain value of the current link.
7. The antenna test system of claim 5,
the transmitting end radio frequency link comprises a signal source and a spread spectrum module; the signal output by the signal source is spread by the spread spectrum module and then transmitted by the transmitting antenna;
the transmitting end spread spectrum module comprises frequency multiplication; the signal of the signal source is output to a transmitting antenna after frequency multiplication and frequency spreading;
the receiving end radio frequency link comprises a harmonic mixer, an independent signal source or the frequency spectrograph integrated with a local oscillator and a duplexer;
the signal intercepted by the receiving antenna and the local oscillator signal are accessed into a harmonic mixer combiner, and the intermediate frequency signal after frequency conversion of the mixer is combined with the local oscillator signal through a duplexer and sent to a frequency spectrograph for testing.
8. The antenna test system of claim 7, wherein for millimeter wave band signals:
a spread spectrum module of a transmitting end radio frequency link adopts 6-frequency multiplication, a signal source outputs 11.83-14.33 GHz signals, and the transmitting end radio frequency link outputs 60-90 GHz transmitting signals; 6, the frequency multiplication is carried out by a 12V power supply;
the radio frequency system adopts a spread spectrum module to realize the transmission and the reception of millimeter waves of 40-110 GHz;
the local oscillator signal frequency is 8.875-10.75 GHz;
the local oscillation signal frequency inserts a plurality of stages of radio frequency amplifiers at the tail end so as to provide enough local oscillation power amplitude for the frequency mixer;
and the radio frequency link of the receiving end adopts an 8-frequency multiplication harmonic mixer.
9. The antenna test system of claim 8,
the method comprises the following steps that a transmitting end radio frequency link output end outputs a 60-90 GHz transmitting signal, and the signal is transmitted to a space through a transmitting antenna;
a receiving end radio frequency link adopts a duplexer to divide a local oscillation signal and an intermediate frequency signal into an upper path and a lower path, wherein the local oscillation signal is amplified by a two-stage driving amplifier and then is transmitted to a harmonic mixer;
the local oscillation signal is amplified and then transmitted to a harmonic mixer through another duplexer; the intermediate frequency signal is mixed by 8 times of the central signal received by the receiving antenna and the local oscillation signal to generate an intermediate frequency, and the intermediate frequency signal is transmitted to a rotary joint of the servo turntable through a duplexer and then is sent to the frequency spectrograph;
the amplification link has-4 dB attenuation;
the antenna test system obtains one or more of the directional coefficient and gain, half-power lobe width, zero point position, any level lobe width, each side lobe position and corresponding level value parameters of the antenna to be tested.
10. The antenna test system according to any one of claims 1 to 9, wherein the dynamic range of each test frequency band of the antenna test system is 67 to 123; under the condition of far-field distance, the maximum size of the antenna which can be measured corresponds to 500-4000 mm.
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