CN111610377A - Antenna test system, method, millimeter wave radar, and computer-readable storage medium - Google Patents
Antenna test system, method, millimeter wave radar, and computer-readable storage medium Download PDFInfo
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- 238000013031 physical testing Methods 0.000 claims abstract description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
- G01R29/105—Radiation diagrams of antennas using anechoic chambers; Chambers or open field sites used therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
Abstract
The application relates to an antenna test system, a method, a millimeter wave radar and a computer readable storage medium, the antenna test system comprising: the experimental camera bellows is used for providing a physical testing environment; the emission antenna assembly is arranged in the experimental camera bellows and used for generating and emitting single-tone signals of any frequency point in a first frequency band under the action of a first control signal; the antenna assembly to be tested is arranged in the experiment dark box, is used for keeping a first direction preset angle, rotates along a second direction under the action of a second control signal, and receives test signals corresponding to the single-tone signals at different second direction angles in the rotating process; and the test equipment is respectively connected with the transmitting antenna assembly and the antenna assembly to be tested, is used for generating a first control signal and a second control signal, and is also used for measuring the test signals to obtain a test result. This application has reduced the cost of system when guaranteeing antenna test performance through set up the transmission antenna subassembly and the receiving antenna subassembly that work in the w wave band in the camera bellows of less size.
Description
Technical Field
The present disclosure relates to the field of millimeter wave radar technologies, and in particular, to an antenna testing system, an antenna testing method, a millimeter wave radar, and a computer-readable storage medium.
Background
Millimeter wave radar is the high accuracy sensor of measuring testee relative distance, relative speed, position, is applied to the military field in early days, and along with the development and the progress of radar technique, millimeter wave radar sensor begins to be applied to a plurality of fields such as automotive electronics, unmanned aerial vehicle, intelligent transportation. The millimeter wave antenna is a traditional Chinese medicine component of the millimeter wave radar, and the antenna test system is used for testing the performance of the millimeter wave antenna and is often placed in a microwave darkroom.
However, for the vehicle-mounted millimeter wave radar antenna, the vehicle-mounted radar works in the W band, many components need to be customized, the cost of the whole set of antenna test system is too high, and the performance of the test system is difficult to guarantee.
Disclosure of Invention
The embodiment of the application provides an antenna test system and method, a millimeter wave radar and a computer readable storage medium, which can ensure test performance and reduce cost.
An antenna test system applied to millimeter wave radar, comprising:
the experimental camera bellows is used for providing a physical testing environment;
the emission antenna assembly is arranged in the experimental camera bellows and used for generating and emitting single-tone signals of any frequency point in a first frequency band under the action of a first control signal, wherein the first frequency band is in a W wave band;
the antenna assembly to be tested is arranged in the experiment dark box, is spaced from the emission antenna assembly by a preset distance, is used for keeping a preset angle in a first direction, rotates along a second direction under the action of a second control signal, and receives test signals corresponding to the single-tone signals at different second direction angles in the rotating process;
the test equipment is arranged outside the experiment dark box, is respectively connected with the emission antenna assembly and the antenna assembly to be tested, is used for generating the first control signal and the second control signal, and is further used for measuring the test signal to obtain a test result, wherein the test result at least comprises: directional pattern test results, gain test results, and standing wave test results.
In one embodiment, the antenna assembly under test includes:
the electric turntable is used for rotating under the action of the second control signal;
and the antenna to be tested is connected with the electric turntable and used for receiving the test signal corresponding to the single tone signal in the process of the electric turntable, and the preset distance and the size of the antenna to be tested are in a preset relation.
In one embodiment, the test apparatus includes:
the frequency spectrograph component is connected with the antenna component to be tested and used for measuring the test signal and generating test data;
and the computer equipment is respectively connected with the transmitting antenna assembly, the antenna assembly to be tested and the frequency spectrograph assembly, is used for generating the first control signal and the second control signal, and is further used for generating the test result according to the test data.
In one embodiment, the spectrometer assembly comprises:
the frequency spectrograph works in a second frequency band and is used for measuring and displaying an input signal, and the second frequency band is positioned in the first frequency band;
and the frequency expansion head is respectively connected with the antenna assembly to be tested and the frequency spectrograph and is used for expanding the working frequency band of the frequency spectrograph from the second frequency band to the first frequency band so as to enable the frequency spectrograph to measure the test signal and generate test data.
In one embodiment, the radiating antenna assembly includes:
the signal generation module is used for generating single-tone signals of any frequency point in a first frequency band under the action of the first control signal;
the microstrip waveguide tool is connected with the signal generation module and used for transmitting the single-tone signal;
and the transmitting antenna is connected with the microstrip waveguide tool and is used for transmitting the single-tone signal.
An antenna test method is applied to an antenna test system and comprises the following steps:
respectively connecting an emission antenna assembly and an antenna assembly to be tested in an experimental camera bellows with test equipment;
controlling the test equipment to transmit the generated first control signal to the transmitting antenna assembly so as to enable the transmitting antenna assembly to generate and transmit single-tone signals of any frequency point in a first frequency band, wherein the first frequency band is in a W-band;
controlling the test equipment to generate a second control signal and transmitting the second control signal to the antenna assembly to be tested, so that the antenna assembly to be tested keeps a preset angle in a first direction and rotates along a second direction in a first step under the action of the second control signal, and receiving test signals corresponding to the single tone signals in different second direction angles in the rotating process;
controlling the test equipment to measure the test signal to obtain a test result, wherein the test result at least comprises: directional pattern test results, gain test results, and standing wave test results.
In one embodiment, the test apparatus includes: before the antenna assembly to be tested maintains a preset angle in the first direction and rotates in the second direction in a first step under the action of the second control signal, the method further comprises the following steps:
controlling, with the computer device, the transmit antenna assembly to generate a pre-processed tone signal and transmit the pre-processed tone signal, wherein the pre-processed tone signal is within the first frequency band;
controlling the computer equipment to generate a third control signal and transmitting the third control signal to the antenna assembly to be tested so as to enable the antenna assembly to be tested to rotate in a second step along the first direction and obtain a preprocessed test signal corresponding to the preprocessed single tone signal;
and acquiring the preset angle of the first direction according to the power of the preprocessed test signal received at each angle in the first direction.
In one embodiment, the controlling the test equipment to measure the test signal to obtain the test result includes:
setting the frequency spectrograph component into a preset scanning mode and a preset triggering mode to measure the test signal and generate test data;
and controlling the computer equipment to generate the test result according to the test data.
A millimeter wave radar comprising a memory, a processor and an antenna testing system, the memory having stored therein a computer program which, when executed by the processor, causes the processor to carry out the steps of the antenna testing method as described above.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method as described above.
The antenna testing system, the method, the millimeter wave radar and the computer readable storage medium are applied to the millimeter wave radar, and the system comprises the following steps: the experimental camera bellows is used for providing a physical testing environment; the emission antenna assembly is arranged in the experimental camera bellows and used for generating and emitting single-tone signals of any frequency point in a first frequency band under the action of a first control signal, wherein the first frequency band is in a W wave band; the antenna assembly to be tested is arranged in the experiment dark box, is spaced from the emission antenna assembly by a preset distance, is used for keeping a preset angle in a first direction, rotates along a second direction under the action of a second control signal, and receives test signals corresponding to the single-tone signals at different second direction angles in the rotating process; the test equipment is arranged outside the experiment dark box, is respectively connected with the emission antenna assembly and the antenna assembly to be tested, is used for generating the first control signal and the second control signal, and is further used for measuring the test signal to obtain a test result, wherein the test result at least comprises: directional pattern test results, gain test results, and standing wave test results. The method comprises the steps of arranging a transmitting antenna assembly and a receiving antenna assembly which work in a w wave band in a small-size dark box, and controlling a test process by utilizing test equipment. The cost of the system is reduced while the antenna test performance is ensured. And the test equipment is utilized to control the antenna assembly to be tested and the transmitting antenna assembly, and a test result is obtained according to the test signal, so that closed-loop control is formed, and the antenna automatic test is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an internal structure of a millimeter wave radar in one embodiment;
FIG. 2 is a schematic diagram of an antenna test system according to an embodiment;
FIG. 3 is a schematic diagram of an antenna test system according to another embodiment;
FIG. 4 is a flow diagram of a method for antenna testing in one embodiment;
FIG. 5 is a flow chart of a method for antenna testing in yet another embodiment;
FIG. 6 is a flowchart illustrating steps in one embodiment for controlling a test equipment to measure a test signal to obtain a test result.
Detailed Description
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.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first direction may be referred to as a second direction, and similarly, a second direction may be referred to as a first direction, without departing from the scope of the present application. The first direction and the second direction are both directions, but they are not the same direction.
The application provides an antenna test system, is applied to millimeter wave radar, and millimeter wave radar is the radar that work was surveyed in millimeter wave band (millimeter wave). Usually, the millimeter wave is in the frequency domain of 30 to 300GHz (with a wavelength of 1 to 10 mm). Millimeter-wave radar has some of the advantages of both microwave and photoelectric radar because the wavelength of millimeter-wave waves is intermediate between microwave and centimeter waves.
The application provides an antenna test system, is applied to millimeter wave radar, and figure 1 is the internal structure sketch map of millimeter wave radar in an embodiment. As shown in fig. 1, the millimeter wave radar includes a processor, a memory, and an antenna test system connected by a system bus. The processor is used for providing calculation and control capability and supporting the operation of the whole millimeter wave radar. The memory may include a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The computer program can be executed by a processor for implementing an antenna testing method provided in the following embodiments. The internal memory provides a cached execution environment for the operating system computer programs in the non-volatile storage medium.
FIG. 2 is a schematic diagram of an antenna test system 10 according to an embodiment; as shown in fig. 2, the antenna test system 10 includes: an experimental dark box 110, a radiation antenna assembly 120, an antenna assembly under test 130 and a test device 140. The experimental dark box 110 is used for providing a physical testing environment; the transmitting antenna assembly 120 is arranged in the experimental dark box 110 and used for generating and transmitting a single-tone signal with any frequency point in a first frequency band under the action of a first control signal, wherein the first frequency band is in a W wave band; the antenna assembly 130 to be tested is arranged in the experiment dark box 110, is arranged at a preset distance from the emission antenna assembly 120, is used for keeping a preset angle in a first direction, rotates along a second direction under the action of a second control signal, and receives test signals corresponding to the single-tone signals at different second direction angles in the rotating process; the test equipment 140, located outside the experimental dark box 110, is connected to the radiating antenna assembly 120 and the antenna assembly 130 to be tested, and is configured to generate a first control signal and a second control signal, and further configured to measure the test signal to obtain a test result, where the test result at least includes: directional pattern test results, gain test results, and standing wave test results.
Specifically, experiment camera bellows 110 mainly used provides environment this moment for the test of on-vehicle millimeter wave antenna in this application, and the operating frequency range of on-vehicle millimeter wave is 77GHz ~ 79 GHz. Since the boundary distance R between the radiation near field region and the radiation far field region is 2D × D/λ, and the size D of the antenna 132 to be tested in the antenna assembly 130 to be tested is about 33mm, the distance between the transmitting antenna and the antenna to be tested in the transmitting antenna assembly 120 is about greater than 0.6m, so as to satisfy the antenna far field test condition. The laboratory black box 110 used in this application has dimensions of about 3m x 2m × 1.5m, which is about 228 times smaller than a standard dark room (10 m method). And the bottom of the experiment camera bellows 110 is provided with 6 universal pulleys, which can ensure that the experiment camera bellows 110 moves towards all directions according to requirements. In addition, the coating of the millimeter wave band wave-absorbing material is arranged in the experimental camera bellows 110, which is different from the full-wave band wave-absorbing material arranged in a standard camera bellows.
And the transmitting antenna assembly 120 is arranged inside the experimental dark box 110 and comprises a signal generating module and a transmitting antenna. The signal generating module can generate a single tone signal at any frequency point in the first frequency band under the action of the first control signal, wherein the testing device 140 generates the first control signal according to the testing requirement and transmits the first control signal to the radiating antenna assembly 120. The first frequency band may refer to 76 GHz-80 GHz. And a microstrip-to-waveguide tool is arranged between the signal generating module and the transmitting antenna and is used for connecting the signal generating module with the transmitting antenna with standard gain. In the prior art, a signal source of a W-band is often required to generate a single-tone signal, which is relatively expensive and rarely available on the market. The microstrip waveguide-switching tool is arranged between the signal generating module and the transmitting antenna, so that single-tone signals in a frequency band of 76 GHz-80 GHz can be transmitted.
The antenna assembly 130 to be tested is arranged in the experiment dark box 110, and the antenna assembly 130 to be tested comprises an antenna to be tested and an electric rotary table 131. The antenna to be measured and the transmitting antenna in the transmitting antenna assembly 120 are spaced by a preset distance, the preset distance R may be calculated according to a formula, where R is 2D/λ, D is the size of the antenna 132 to be measured, and λ is the wavelength of the millimeter wave with the frequency band of 77 GHz-79 GHz. The electric controllable turntable is adjustable within +/-30 degrees in a first direction, the first direction refers to a pitching direction, the electric controllable turntable is adjustable within 0-360 degrees in a second direction, and the second direction refers to a horizontal plane rotating direction. When the antenna assembly 130 to be tested receives the second control signal sent by the testing equipment 140, the electric turntable 131 is controlled to maintain a preset angle in the first direction according to the second control signal, and rotates in the second direction to receive the test signal corresponding to the single tone signal. The test signal refers to a corresponding signal which is transmitted by the transmitting antenna and received by the antenna to be tested, and the test signal and the single-tone signal have certain difference in power and noise. The antenna assembly 130 to be tested is connected with the test equipment 140 through the communication cable and receives the second control signal sent by the test equipment 140, for example, the test equipment 140 can be connected with the electric turntable 131 through an RS422 communication line, so that the communication stability is ensured. The tested antenna in the implementation refers to a microstrip antenna array, and the tested microstrip antenna and the compared standard gain horn antenna are connected through the microstrip-to-waveguide tooling in the test, so that the correctness of test data is ensured. The standard gain horn antenna refers to a standard gain horn antenna in a frequency band of 76 GHz-81 GHz, the model is PEWAN1015, and the gain is 20dBi, and is used for transmitting signals.
The test equipment 140 is disposed outside the experimental dark box 110, and is connected to the radiating antenna assembly 120 and the antenna assembly 130 to be tested, respectively, and configured to generate a first control signal and a second control signal, transmit the first control signal to the radiating antenna assembly 120, and transmit the second control signal to the antenna assembly 130 to be tested. The test equipment 140 is further configured to receive a test signal transmitted by the antenna assembly 130 to be tested, and obtain a test result according to the test signal, where the test result at least includes: directional pattern test results, gain test results, and standing wave test results. In one embodiment, the test equipment 140 includes a spectrometer component and a computer device. The frequency spectrograph component is connected with the antenna component 130 to be tested and used for measuring the test signal and generating test data; and the computer equipment is respectively connected with the transmitting antenna assembly 120, the antenna assembly 130 to be tested and the spectrometer assembly, and is used for generating a first control signal and a second control signal and generating a test result according to the test data.
In one embodiment, the test system further comprises an equipment support, and the equipment support is used for supporting other equipment in the test system to keep a certain distance from the ground, so that the influence of ground reflection on the test result is reduced.
The antenna test system, the method, the millimeter wave radar and the computer readable storage medium are applied to the millimeter wave radar, and the system comprises the following steps: an experimental dark box 110 for providing a physical testing environment; the transmitting antenna assembly 120 is arranged in the experimental dark box 110 and used for generating and transmitting a single-tone signal with any frequency point in a first frequency band under the action of a first control signal, wherein the first frequency band is in a W wave band; the antenna assembly 130 to be tested is arranged in the experiment dark box 110, is arranged at a preset distance from the emission antenna assembly 120, is used for keeping a preset angle in a first direction, rotates along a second direction under the action of a second control signal, and receives test signals corresponding to the single-tone signals at different second direction angles in the rotating process; the test equipment 140, located outside the experimental dark box 110, is connected to the radiating antenna assembly 120 and the antenna assembly 130 to be tested, and is configured to generate a first control signal and a second control signal, and further configured to measure the test signal to obtain a test result, where the test result at least includes: directional pattern test results, gain test results, and standing wave test results. The present application controls the testing process by placing the transmit antenna assembly 120 and receive antenna assembly operating in the w-band in a smaller size dark box and using the testing equipment 140. The cost of the system is reduced while the antenna test performance is ensured. The test equipment 140 is used for controlling the antenna assembly 130 to be tested and the transmitting antenna assembly 120, and obtaining a test result according to the test signal, so that closed-loop control is formed, and antenna automatic test is facilitated.
In one embodiment, as shown in fig. 2, the antenna assembly 130 to be tested includes: a motor-driven turntable 131 for rotating under the action of a second control signal; the antenna 132 to be tested is connected with the electric turntable 131 and used for receiving the test signal corresponding to the single tone signal in the process of the electric turntable 131, and the preset distance is in a preset relation with the size of the antenna 132 to be tested.
Specifically, the antenna assembly 130 to be tested may receive the second control signal, and when the antenna assembly 130 to be tested receives the second control signal sent by the testing device 140, the electric turntable 131 is controlled to maintain the preset angle in the first direction according to the second control signal, and rotate in the second direction to receive the test signal corresponding to the single tone signal. The antenna to be measured and the transmitting antenna in the transmitting antenna assembly 120 are set at a preset distance, the preset distance R may be calculated according to a formula, where R is 2D × D/λ, D refers to the size of the antenna 132 to be measured, and λ is the wavelength of the millimeter wave with the frequency band of 77 GHz-79 GHz. For example, according to far field formula 2D × D/λ, the product antenna size D is about 33mm, so the distance between the transmitting antenna and the aperture of the antenna to be measured is greater than about 0.6m, that is, the antenna far field test condition is satisfied.
In one embodiment, as shown in fig. 2, the radiating antenna assembly 120 includes: the signal generating module 121 is configured to generate a single tone signal of any frequency point in a first frequency band under the action of the first control signal; the microstrip waveguide tool 122 is connected with the signal generation module 121 and is used for transmitting single-tone signals; and the transmitting antenna 123 is connected with the microstrip waveguide tool 122 and used for transmitting the single-tone signal.
Specifically, the microstrip waveguide tool 122 is configured to connect the signal generating module 121 and the transmitting antenna 123. A microstrip-to-waveguide tool 122 is arranged between the signal generating module 121 and the transmitting antenna 123, and the microstrip-to-waveguide tool 122 is used for connecting the signal generating module 121 with a transmitting antenna with standard gain. The microstrip-waveguide transmission device can transmit single-tone signals in a frequency range of 76 GHz-80 GHz by arranging the microstrip-waveguide transmission tool between the signal generation module 121 and the transmitting antenna 123.
In one embodiment, as shown in FIG. 3, the test apparatus 140 includes: the frequency spectrograph component 141 is connected with the antenna component 130 to be tested and used for measuring the test signal and generating test data; and the computer equipment 142 is connected with the transmitting antenna assembly 120, the antenna assembly 130 to be tested and the spectrometer assembly 141 respectively, and is used for generating a first control signal and a second control signal and generating a test result according to the test data.
Specifically, the spectrometer component 141 may measure a test signal corresponding to 77GHz to 79GHz and generate test data, and transmit the test data to the computer device 142. The computer device 142 may generate the first control signal and the second control signal and transmit the first control signal to the radiating antenna assembly 120 and the second control signal to the antenna assembly 130 under test. The computer device 142 further receives the test data transmitted by the spectrometer component 141, and obtains a test result according to the test data, where the test result at least includes: directional pattern test results, gain test results, and standing wave test results.
In one embodiment, the spectrometer component 141 comprises: the frequency spectrograph works in a second frequency band and is used for measuring and displaying the input signal, and the second frequency band is lower than the first frequency band; and the frequency expansion head is respectively connected with the antenna assembly 130 to be tested and the spectrometer and is used for expanding the working frequency band of the spectrometer from the second frequency band to the first frequency band so as to enable the spectrometer to measure the test signal and generate test data.
Specifically, the spectrometer component 141 includes: a spectrometer and a frequency extension head. The type of the frequency spectrograph is Agilent 9020B, the frequency measuring range of the frequency spectrograph is 10 Hz-44 GHz, the working frequency range of the millimeter wave radar is 77 GHz-79 GHz, and direct measurement cannot be conducted. By using the frequency extension head, the measuring range of the spectrometer is changed to 70GHz to 90GHz, and the frequency band required by people is completely covered. The signal of the frequency spreading head can be M1971), and the signal is matched with a 9020B frequency spectrograph for use, and the frequency spreading spectrograph measures the bandwidth. Wherein, the frequency spectrograph and the frequency extension head can be connected through a radio frequency cable.
The embodiment of the present application provides an antenna testing method, which is applied to an antenna testing system, and as shown in fig. 4, the antenna testing method includes: step 402 to step 408. Step 402, connecting an emission antenna assembly and an antenna assembly to be tested in an experimental dark box with test equipment respectively; step 404, controlling the test equipment to transmit the generated first control signal to the transmitting antenna assembly, so that the transmitting antenna assembly generates and transmits a single-tone signal of any frequency point in a first frequency band, wherein the first frequency band is in a W-band; step 406, controlling the test equipment to generate a second control signal and transmit the second control signal to the antenna assembly to be tested, so that the antenna assembly to be tested keeps a preset angle in the first direction and rotates along the second direction in a first step under the action of the second control signal, and receives test signals corresponding to the single-tone signals in different second direction angles in the rotating process; step 408, controlling the test equipment to measure the test signal to obtain a test result, where the test result at least includes: directional pattern test results, gain test results, and standing wave test results.
Specifically, an emission antenna assembly and an antenna assembly to be tested in an experimental dark box are respectively connected with a test device; and the test equipment generates a first control signal and a second control signal, transmits the first control signal to the transmitting antenna assembly and transmits the second control signal to the antenna assembly to be tested. And the transmitting antenna assembly is arranged inside the experiment dark box and comprises a signal generating module and a transmitting antenna. The signal generation module can generate single-tone signals of any frequency point in the first frequency band under the action of the first control signal. The antenna assembly to be tested comprises an antenna to be tested and an electric rotary table. The antenna to be tested and the transmitting antenna in the transmitting antenna assembly are arranged at a preset distance interval, the preset distance R can be calculated according to a formula, R is 2D/lambda, D refers to the size of the antenna to be tested, and lambda is the wavelength of millimeter waves with the frequency band of 77 GHz-79 GHz. The antenna assembly to be tested comprises an electric controllable rotary table and an antenna to be tested, wherein the electric controllable rotary table is adjustable within +/-30 degrees in a first direction, the first direction refers to a pitching direction, the first direction is adjustable within 0-360 degrees in a second direction, and the second direction refers to a horizontal plane rotating direction. The antenna assembly to be tested can receive the second control signal, the rotation angle related information in the second control signal is transmitted to the electric rotary table so as to control the electric rotary table to keep a preset angle in the first direction, and the test signal corresponding to the single tone signal is received through rotation in the second direction. The test signal refers to a corresponding signal which is transmitted by the transmitting antenna and received by the antenna to be tested, and the test signal and the single-tone signal have certain difference in power and noise. The test equipment receives the test signal transmitted by the antenna assembly to be tested, and obtains a test result according to the test signal, wherein the test result at least comprises: directional pattern test results, gain test results, and standing wave test results.
In one embodiment, a test apparatus includes: a spectrometer assembly and a computer device, before the antenna assembly to be tested keeps a preset angle of a first direction and rotates in a second direction in a first step under the action of a second control signal, as shown in fig. 5, the antenna testing method further includes: step 502 to step 506. Step 502, controlling a transmitting antenna assembly to generate a pre-processed tone signal and transmitting the pre-processed tone signal by using a computer device, wherein the pre-processed tone signal is within a first frequency band; step 504, controlling the computer device to generate a third control signal and transmit the third control signal to the antenna assembly to be tested, so that the antenna assembly to be tested rotates in a second step along the first direction and a preprocessed test signal corresponding to the preprocessed single tone signal is obtained; step 506, obtaining a first direction preset angle according to the power of the preprocessed test signal received at each angle in the first direction.
Specifically, the first control signal generating module generated by the computer device generates a single tone signal of 79GHz, and the computer device generates the second control signal to control the second azimuth angle of the electric turntable to be at 0 °, that is, the antenna to be measured and the standard gain horn antenna of the 76 GHz-81 GHz band are in a relative state at this time, that is, the aperture normals of the two antennas coincide. The test signal is then measured using a spectrometer, where a single tone signal at a frequency of 79GHz is visible. And then, setting and sending a second control signal to control the pitch angle of the electric turntable through a computer, firstly adjusting the pitch angle to a first inflection point with the power of a 79GHz signal on the frequency spectrograph decreasing from high to low according to 1-degree stepping, and recording the corresponding maximum power Pup at the first inflection point. And then controlling the electric turntable to return to the normal direction, adjusting the electric turntable downwards to a second inflection point with the power gradually reduced on the frequency spectrograph according to 1-degree stepping, and recording the power Pdawn corresponding to the second inflection point. And then comparing the sizes of the Pup and the Pdawn, if the Pup is larger than the Pdawn, setting the first-direction preset angle as an angle corresponding to the Pup power, and if the Pup is smaller than the Pdawn, setting the first-direction preset angle as an angle corresponding to the Pdawn power.
In one embodiment, as shown in fig. 6, the step of controlling the testing device to measure the test signal to obtain the test result includes: step 602 to step 604. Step 602, setting a spectrometer component to a preset scanning mode and a preset triggering mode to measure a test signal and generate test data; and step 604, controlling the computer equipment to generate a test result according to the test data.
Specifically, for directional diagram test, a spectrum analyzer Span is set to be 0Hz, Sweep is set to be 9s, 1001pts, resBW is set to be 100KHz, triggering is started, a triggering source is set to be Video, and a trigger Slope is in a level rising edge triggering mode, and then a second control signal is sent to an antenna assembly to be tested through a computer to control the rotation of the electric turntable in the direction anticlockwise to 60 degrees. And then adjusting a TRIG LVL (trigger level) line to be 5dB higher than the bottom noise line, changing the triggering into single triggering, sending a second control signal to the antenna assembly to be tested through the computer, controlling the direction of the electric turntable to rotate 120 degrees clockwise according to 21 degrees/s, and seeing the directional diagram of the antenna to be tested on the frequency spectrograph, namely the directional diagram of the antenna used by the millimeter wave radar.
For the gain test, a standard gain antenna and a tested antenna are adopted, the opening surfaces of the standard gain antenna and the tested antenna are in the same plane, the standard gain antenna is firstly used, a second control signal is sent to an antenna assembly to be tested through a computer, so that the azimuth angle of the electric turntable is controlled to be 0 degrees, the pitch angle keeps the same angle as the directional diagram test, and the power Pres on the frequency spectrograph is recorded; then, the antenna to be tested is replaced, the same steps are repeated, and the power Ptest on the frequency spectrograph is recorded, because the gain of the standard gain antenna is known as 20dBi, the gain test result of the antenna to be tested can be obtained through a formula 20 × Ptest/Pres, and the unit dBi is the unit. In addition, in the standing wave test, an Agilent vector network analyzer N5224A and a frequency doubling module are adopted to directly test the antenna to be tested to obtain a standing wave test result.
It should be understood that although the various steps in the flow charts of fig. 4-6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 4-6 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
The division of each module in the antenna test system is only for illustration, and in other embodiments, the antenna test system may be divided into different modules as needed to complete all or part of the functions of the antenna test system.
For the specific definition of the antenna test system, reference may be made to the above definition of the antenna test method, which is not described herein again. The modules in the antenna test system can be implemented in whole or in part by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The implementation of each module in the antenna test system provided in the embodiments of the present application may be in the form of a computer program. The computer program may be run on a terminal or a server. The program modules constituted by the computer program may be stored on the memory of the millimeter wave radar. Which when executed by a processor, performs the steps of the method described in the embodiments of the present application.
The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of the antenna testing method.
A computer program product containing instructions which, when run on a computer, cause the computer to perform an antenna testing method.
Any reference to memory, storage, database, or other medium used herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and bus dynamic RAM (RDRAM).
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 present application. 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. An antenna test system, applied to a millimeter wave radar, comprising:
the experimental camera bellows is used for providing a physical testing environment;
the emission antenna assembly is arranged in the experimental camera bellows and used for generating and emitting single-tone signals of any frequency point in a first frequency band under the action of a first control signal, wherein the first frequency band is in a W wave band;
the antenna assembly to be tested is arranged in the experiment dark box, is spaced from the emission antenna assembly by a preset distance, is used for keeping a preset angle in a first direction, rotates along a second direction under the action of a second control signal, and receives test signals corresponding to the single-tone signals at different second direction angles in the rotating process;
the test equipment is arranged outside the experiment dark box, is respectively connected with the emission antenna assembly and the antenna assembly to be tested, is used for generating the first control signal and the second control signal, and is further used for measuring the test signal to obtain a test result, wherein the test result at least comprises: directional pattern test results, gain test results, and standing wave test results.
2. The system of claim 1, wherein the antenna assembly under test comprises:
the electric turntable is used for rotating under the action of the second control signal;
and the antenna to be tested is connected with the electric turntable and used for receiving the test signal corresponding to the single tone signal in the process of the electric turntable, and the preset distance and the size of the antenna to be tested are in a preset relation.
3. The system of claim 2, wherein the test device comprises:
the frequency spectrograph component is connected with the antenna component to be tested and used for measuring the test signal and generating test data;
and the computer equipment is respectively connected with the transmitting antenna assembly, the antenna assembly to be tested and the frequency spectrograph assembly, is used for generating the first control signal and the second control signal, and is further used for generating the test result according to the test data.
4. The system of claim 3, wherein the spectrometer assembly comprises:
the frequency spectrograph works in a second frequency band and is used for measuring and displaying the input signal, and the second frequency band is lower than the first frequency band;
and the frequency expansion head is respectively connected with the antenna assembly to be tested and the frequency spectrograph and is used for expanding the working frequency band of the frequency spectrograph from the second frequency band to the first frequency band so as to enable the frequency spectrograph to measure the test signal and generate test data.
5. The system of claim 1, wherein the radiating antenna assembly comprises:
the signal generation module is used for generating single-tone signals of any frequency point in a first frequency band under the action of the first control signal;
the microstrip waveguide tool is connected with the signal generation module and used for transmitting the single-tone signal;
and the transmitting antenna is connected with the microstrip waveguide tool and is used for transmitting the single-tone signal.
6. An antenna test method is applied to an antenna test system, and comprises the following steps:
respectively connecting an emission antenna assembly and an antenna assembly to be tested in an experimental camera bellows with test equipment;
controlling the test equipment to transmit the generated first control signal to the transmitting antenna assembly so as to enable the transmitting antenna assembly to generate and transmit single-tone signals of any frequency point in a first frequency band, wherein the first frequency band is in a W-band;
controlling the test equipment to generate a second control signal and transmitting the second control signal to the antenna assembly to be tested, so that the antenna assembly to be tested keeps a preset angle in a first direction and rotates along a second direction in a first step under the action of the second control signal, and receiving test signals corresponding to the single tone signals in different second direction angles in the rotating process;
controlling the test equipment to measure the test signal to obtain a test result, wherein the test result at least comprises: directional pattern test results, gain test results, and standing wave test results.
7. The method of claim 6, wherein the test equipment comprises: before the antenna assembly to be tested maintains a preset angle in the first direction and rotates in the second direction in a first step under the action of the second control signal, the method further comprises the following steps:
controlling, with the computer device, the transmit antenna assembly to generate a pre-processed tone signal and transmit the pre-processed tone signal, wherein the pre-processed tone signal is within the first frequency band;
controlling the computer equipment to generate a third control signal and transmitting the third control signal to the antenna assembly to be tested so as to enable the antenna assembly to be tested to rotate in a second step along the first direction and obtain a preprocessed test signal corresponding to the preprocessed single tone signal;
and acquiring the preset angle of the first direction according to the power of the preprocessed test signal received at each angle in the first direction.
8. The method of claim 7, wherein controlling the test equipment to measure the test signal to obtain a test result comprises:
setting the frequency spectrograph component into a preset scanning mode and a preset triggering mode to measure the test signal and generate test data;
and controlling the computer equipment to generate the test result according to the test data.
9. A millimeter wave radar comprising a memory, a processor and an antenna testing system, the memory having stored therein a computer program which, when executed by the processor, causes the processor to carry out the steps of the antenna testing method of any one of claims 6 to 8.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 6 to 8.
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