CN116626628B - DBF phased array radar antenna air feed near field test method, device and medium - Google Patents
DBF phased array radar antenna air feed near field test method, device and medium Download PDFInfo
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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
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
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Abstract
The application discloses a DBF phased array radar antenna empty feed near field test method, equipment and medium, relates to the field of radar array antennas, and aims to solve the problem that signals on two sides of an existing DBF phased array radar antenna are different in frequency and cannot acquire amplitude and phase to perform empty feed near field test. Comprising the following steps: the first radio frequency signal to be tested is a radio frequency test signal of the vector network analyzer during the emission test; obtaining a radio frequency reference signal with the same frequency as the radio frequency test signal through a frequency conversion reference channel frequency mixing clock signal and a local oscillator coupling port signal and obtaining a corresponding amplitude phase; the directional coupler divides the second radio frequency signal to be tested into two paths and radiates the main microwave radio frequency signal to the space to obtain digital test data; and obtaining digital reference data with the same frequency as the digital test data through the frequency conversion reference channel mixing branch microwave radio frequency signal, the clock signal and the local oscillator coupling port signal, and determining a corresponding amplitude phase, thereby realizing the air feed near field test.
Description
Technical Field
The application relates to the technical field of radar array antennas, in particular to a DBF phased array radar antenna air feed near field test method, equipment and medium.
Background
Phased array radar antennas belong to radar array antennas, the shape of the pattern is changed by changing the amplitude of each radar array antenna radiating element to realize pattern weighting, and the electric control scanning of the pattern, namely the change of the direction of the pattern, is realized by changing the phase of each radar array antenna radiating element, so that the conventional phased array radar antennas all realize the change of the direction and the shape of the pattern through radio frequency analog signals. With the development of digital technology, in recent years, more and more DBF phased array radar antennas have been developed, and digital beam forming technology (Digital Beam Forming, DBF) is a product of combining radar antenna beam forming principles with digital signal processing technology, and is currently applied to the phased array radar antenna field to form a transmitting or receiving pattern beam in a desired direction through digital signal processing. The greatest difference between a DBF phased array radar antenna and a traditional active phased array radar antenna is that each antenna channel is provided with a transceiver component (also called a T/R component), the traditional active phased array radar antenna is provided with a transceiver component based on analog technology, and the DBF phased array radar antenna is provided with a transceiver component based on digital technology.
The traditional active phased array radar antenna based on the analog transceiver component consists of an analog transceiver component phased array antenna (comprising a wave control extension), a frequency synthesizer (providing a clock source, a local vibration source and the like), a multichannel receiver (providing up-down conversion and intermediate frequency digital sampling), a digital signal processor and the like. When the near-field measurement method is used for performing amplitude-phase calibration and pattern test on the channels of the active phased array radar antenna, the radar radio frequency co-frequency signals can be used as reference channels of the vector network analyzer for performing S21 parameter test because the active phased array radar antenna has radio frequency signals (generally provided by a coupling port of a frequency synthesizer) with the same frequency as the antenna radiation signals.
However, the DBF phased array radar antenna based on the digital transceiver component only comprises the digital transceiver component phased array antenna, a digital signal processor and the like, and the frequency source provided by the frequency synthesizer in the original traditional active phased array radar antenna is provided by the DDS module and the reference clock in the DBF phased array radar antenna. The signals of each channel for up-conversion, down-conversion and the present vibration source in the DBF phased array radar antenna are integrated into a digital transceiver component, and the DBF phased array radar antenna based on the digital transceiver component only has a digital I/O port and a reference clock, and has no common-frequency radio frequency port. Because the signal radiated or received by the antenna at one side of the DBF phased array radar antenna has different frequency from the transmitted or received signal fed in at the other side of the DBF phased array radar antenna, the vector network analyzer cannot test the S21 amplitude and phase parameters and cannot obtain the amplitude and phase information necessary for the air-fed near-field test. Thus, the spatial feed amplitude phase calibration and pattern testing for DBF phased array radar antennas present a significant challenge.
Disclosure of Invention
The embodiment of the application provides a method, equipment and medium for testing an empty feed near field of a DBF phased array radar antenna, which are used for solving the technical problems that a vector network analyzer cannot test amplitude and phase parameters of the antenna and cannot obtain amplitude and phase information necessary for the empty feed near field test under the condition that signals radiated or received by one side of the existing DBF phased array radar antenna and transmitted or received signals fed by the other side are different in frequency.
In one aspect, an embodiment of the present application provides a method for testing an air feed near field of a DBF phased array radar antenna, including:
during emission test, acquiring a first radio frequency signal to be tested of a DBF phased array radar antenna based on a digital receiving and transmitting assembly through a near field scanning frame, and sending the first radio frequency signal to be tested to a vector network analyzer to serve as a radio frequency test signal;
mixing a clock signal and a local oscillator coupling port signal of the DBF phased array radar antenna through a frequency conversion reference channel to obtain a radio frequency reference signal with the same frequency as the radio frequency test signal, and testing the ratio between the radio frequency test signal and the radio frequency reference signal through the vector network analyzer to obtain the amplitude and the phase of the DBF phased array radar antenna;
when receiving a test, dividing a second radio frequency signal to be tested of the vector network analyzer into a main microwave radio frequency signal and a branch microwave radio frequency signal through a directional coupler, and radiating the main microwave radio frequency signal to a space through the near field scanning frame so as to enable the DBF phased array radar antenna to obtain digital test data;
and mixing the branch microwave radio frequency signals, the clock signals and the local oscillator coupling port signals through the variable frequency reference channel to obtain digital reference data with the same frequency as the digital test data, and determining the amplitude and the phase of the DBF phased array radar antenna according to the ratio between the digital test data and the digital reference data so as to realize the air-fed near-field test of the DBF phased array radar antenna.
In one implementation manner of the present application, during the transmitting test, a near field scanning frame is used to collect a first radio frequency signal to be tested of a DBF phased array radar antenna based on a digital transceiver component, and the first radio frequency signal to be tested is sent to a vector network analyzer to be used as a radio frequency test signal, which specifically includes:
when a DBF phased array radar antenna based on a digital receiving and transmitting assembly performs emission test, a test industrial personal computer controls a near-field scanning frame through a scanning frame controller and moves the near-field scanning frame to a preset sampling position;
the DBF phased array radar antenna is controlled through a radar measurement and control platform so that the DBF phased array radar antenna forms a first radio frequency signal to be tested, and the first radio frequency signal to be tested is radiated to space through an antenna unit in the DBF phased array radar antenna;
and acquiring the first radio frequency signal to be tested through a sampling probe positioned in a near-field scanning frame at the preset sampling position, and transmitting the first radio frequency signal to be tested into a test channel of a vector network analyzer through a radio frequency cable assembly so as to take the first radio frequency signal to be tested as a radio frequency test signal of the DBF phased array radar antenna.
In one implementation manner of the present application, the frequency conversion reference channel mixes the clock signal and the local oscillator coupling port signal of the DBF phased array radar antenna to obtain a radio frequency reference signal with the same frequency as the radio frequency test signal, which specifically includes:
the test industrial personal computer is communicated with the radar measurement and control platform to control the DBF phased array radar antenna, and a clock signal of a first radio frequency signal to be tested and a local oscillator coupling port signal formed by the DBF phased array radar antenna are sent to a frequency conversion reference channel;
carrying out frequency mixing processing on the clock signal and the local oscillator coupling port signal through the frequency conversion reference channel, and obtaining an upper sideband signal after frequency mixing processing;
transmitting the upper sideband signal into a reference channel of the vector network analyzer, and taking the upper sideband signal as a radio frequency reference signal of the DBF phased array radar antenna; the variable frequency reference channel is used for adjusting the radio frequency reference signal to be in the same frequency with the radio frequency test signal.
In one implementation manner of the present application, the testing, by the vector network analyzer, the ratio between the radio frequency test signal and the radio frequency reference signal to obtain the amplitude and the phase of the DBF phased array radar antenna specifically includes:
The testing industrial personal computer controls the vector network analyzer so that the vector network analyzer samples radio frequency test signals in a test channel and radio frequency reference signals in a reference channel, and tests the ratio between the sampled radio frequency test signals and the radio frequency reference signals;
and obtaining the amplitude and the phase of the DBF phased array radar antenna according to the ratio, and sending the amplitude and the phase of the DBF phased array radar antenna to the test industrial personal computer so that the test industrial personal computer can store the amplitude and the phase.
In one implementation manner of the present application, the dividing, by a directional coupler, the second radio frequency signal to be tested of the vector network analyzer into a main microwave radio frequency signal and a branch microwave radio frequency signal during the receiving test specifically includes:
when a DBF phased array radar antenna based on a digital receiving and transmitting assembly performs receiving test, a testing industrial personal computer controls the vector network analyzer, and sends a second radio frequency signal to be tested to a directional coupler through a testing channel of the vector network analyzer;
dividing the second radio frequency signal to be detected according to a preset proportion by the directional coupler, and obtaining a main microwave radio frequency signal and a branch microwave radio frequency signal corresponding to the second radio frequency signal to be detected;
And the main microwave radio frequency signal is sent to the sampling probe of the near-field scanning frame through a radio frequency cable assembly, and the branch microwave radio frequency signal is sent to the radio frequency input port of the variable frequency reference channel through the radio frequency cable assembly.
In one implementation manner of the present application, the radiating, through the near-field scanning frame, the main microwave radio frequency signal to space so as to enable the DBF phased array radar antenna to obtain digital test data specifically includes:
radiating the main path microwave radio frequency signal to a space through a sampling probe of a near field scanning frame, and receiving the main path microwave radio frequency signal through an antenna unit in a DBF phased array radar antenna;
performing down-conversion treatment on the main path microwave radio frequency signal to form an intermediate frequency signal corresponding to the main path microwave radio frequency signal, and performing digital sampling on the intermediate frequency signal corresponding to the main path microwave radio frequency signal;
and sending the digital I/Q signal corresponding to the main microwave radio frequency signal after digital sampling to a digital signal processor, and taking the digital I/Q signal corresponding to the main microwave radio frequency signal as digital test data of the DBF phased array radar antenna.
In one implementation manner of the present application, the frequency conversion reference channel mixes the branch microwave radio frequency signal, the clock signal and the local oscillator coupling port signal to obtain digital reference data with the same frequency as the digital test data, and specifically includes:
the test industrial personal computer is communicated with the radar measurement and control platform to control the DBF phased array radar antenna, and a clock signal and a local oscillator coupling port signal of the DBF phased array radar antenna are sent to the variable frequency reference channel;
performing down-conversion processing on the branch microwave radio frequency signals, the clock signals and the local oscillator coupling port signals through the frequency conversion reference channel, and obtaining intermediate frequency signals with the same frequency as the digital test data of the DBF phased array radar antenna;
and carrying out digital sampling on the intermediate frequency signal corresponding to the branch microwave radio frequency signal, sending the digital I/Q signal corresponding to the branch microwave radio frequency signal after digital sampling to a digital signal processor, and taking the digital I/Q signal of the branch microwave radio frequency signal as digital reference data of the DBF phased array radar antenna.
In one implementation of the present application, the sampling position preset by the near field scanning frame includes at least one sampling position;
Under the condition that the preset sampling position exceeds one and the air feed near field test of the first preset sampling position is completed, the test industrial personal computer controls the near field scanning frame through the scanning frame controller;
and moving the near-field scanning frame to a second preset sampling position, and performing emission test and receiving test on the DBF phased array radar antenna at the second preset sampling position until the empty feed near-field test of all preset sampling positions corresponding to the DBF phased array radar antenna is completed.
On the other hand, the embodiment of the application also provides a DBF phased array radar antenna air feed near field test device, which comprises:
at least one processor;
and a memory communicatively coupled to the at least one processor;
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a DBF phased array radar antenna feed-through near field test method as described above.
In another aspect, embodiments of the present application also provide a non-volatile computer storage medium storing computer-executable instructions configured to:
The DBF phased array radar antenna air-fed near-field test method is as described above.
The embodiment of the application provides a DBF phased array radar antenna air feed near field test method, equipment and medium, which at least comprise the following beneficial effects:
when a DBF phased array radar antenna based on a digital receiving and transmitting assembly performs transmission test, a first radio frequency signal to be tested of the DBF phased array radar antenna is sent to a vector network analyzer through a near field scanning frame to serve as a radio frequency test signal; through a variable frequency reference channel in the DBF phased array radar antenna, a clock signal and a local oscillator coupling port signal of the DBF phased array radar antenna can be mixed, so that a radio frequency reference signal is adjusted to be in the same frequency with a radio frequency test signal, and a vector network analyzer can test amplitude and phase parameters of the DBF phased array radar antenna according to the radio frequency test signal and the radio frequency reference signal in the same frequency; when the DBF phased array radar antenna based on the digital receiving and transmitting assembly performs receiving test, dividing a second radio frequency signal to be tested output by the vector network analyzer through a directional coupler to obtain a main microwave radio frequency signal and a branch microwave radio frequency signal, and radiating the main microwave radio frequency signal to the space through a near field scanning frame so as to enable the DBF phased array radar antenna to obtain corresponding digital test data; transmitting the branch microwave radio frequency signals, the clock signals and the local oscillator coupling port signals of the DBF phased array radar antenna to a variable frequency reference channel, mixing the branch microwave radio frequency signals, the clock signals and the local oscillator coupling port signals through the variable frequency reference channel, and adjusting digital reference data to be the same frequency as the digital test data so as to test the digital test data and the digital reference data of the same frequency in the DBF phased array radar antenna, thereby obtaining amplitude and phase parameters of the DBF phased array radar antenna; therefore, the amplitude and phase information necessary for the air-fed near-field test can be obtained, and the air-fed near-field test of the DBF phased array radar antenna is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a schematic flow chart of a DBF phased array radar antenna air-fed near-field test method according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a transmission test of a DBF phased array radar antenna according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a receiving test of a DBF phased array radar antenna according to an embodiment of the present application;
fig. 4 is a schematic diagram of an internal structure of a DBF phased array radar antenna air-fed near-field test device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application provides a DBF phased array radar antenna air-feed near-field test method, equipment and medium, wherein when a DBF phased array radar antenna based on a digital receiving and transmitting assembly performs emission test, a near-field scanning frame is used for transmitting a first radio frequency signal to be tested of the DBF phased array radar antenna to a vector network analyzer to serve as a radio frequency test signal; through a variable frequency reference channel in the DBF phased array radar antenna, a clock signal and a local oscillator coupling port signal of the DBF phased array radar antenna can be mixed, so that a radio frequency reference signal is adjusted to be in the same frequency with a radio frequency test signal, and a vector network analyzer can test amplitude and phase parameters of the DBF phased array radar antenna according to the radio frequency test signal and the radio frequency reference signal in the same frequency; when the DBF phased array radar antenna based on the digital receiving and transmitting assembly performs receiving test, dividing a second radio frequency signal to be tested output by the vector network analyzer through a directional coupler to obtain a main microwave radio frequency signal and a branch microwave radio frequency signal, and radiating the main microwave radio frequency signal to the space through a near field scanning frame so as to enable the DBF phased array radar antenna to obtain corresponding digital test data; transmitting the branch microwave radio frequency signals, the clock signals and the local oscillator coupling port signals of the DBF phased array radar antenna to a variable frequency reference channel, mixing the branch microwave radio frequency signals, the clock signals and the local oscillator coupling port signals through the variable frequency reference channel, and adjusting digital reference data to be the same frequency as the digital test data so as to test the digital test data and the digital reference data of the same frequency in the DBF phased array radar antenna, thereby obtaining amplitude and phase parameters of the DBF phased array radar antenna; therefore, the amplitude and phase information necessary for the air-fed near-field test can be obtained, and the air-fed near-field test of the DBF phased array radar antenna is realized. The method solves the technical problems that a vector network analyzer cannot test amplitude and phase and cannot obtain the amplitude and phase necessary for the empty feed near field test under the condition that the antenna on one side of the existing DBF phased array radar antenna radiates or receives signals and the transmitted or received signals fed in from the other side are different in frequency.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a DBF phased array radar antenna air-fed near-field test method according to an embodiment of the present application. As shown in fig. 1, the method for testing the air feed near field of the DBF phased array radar antenna provided by the embodiment of the application includes:
101. during emission test, a first radio frequency signal to be tested of the DBF phased array radar antenna based on the digital receiving and transmitting assembly is acquired through the near-field scanning frame, and the first radio frequency signal to be tested is sent to the vector network analyzer to serve as a radio frequency test signal.
At present, in a traditional active phased array radar antenna based on an analog receiving and transmitting assembly, an air-fed near-field test for transmitting and receiving consists of a test industrial personal computer, a radar measurement and control platform, a time sequence controller, a scanning frame controller and a vector network analyzer, wherein the test industrial personal computer is the master control of a test system, and the traditional active phased array radar antenna to be tested is controlled to work according to a test flow by controlling the radar measurement and control platform. The traditional active phased array radar antenna is low in integration level, a coupling port of radio frequency same-frequency signals is reserved, and air feed near field test of the active phased array radar antenna can be performed. However, with the development of technology and the popularization of DBF phased array radar antennas, the phased array radar antennas evolve to a high integration level, and many DBF phased array radar antennas only have a reference clock port, a digital I/Q control data port and a DC power supply port, signals radiated or received by one side of the DBF phased array radar antenna have different frequencies from the transmitted or received signals fed in from the other side, a vector network analyzer has no method for testing the amplitude and the phase of the DBF phased array radar antenna, cannot obtain the amplitude and the phase information necessary for the null-feed near field test, and completes the null-feed near field test.
It should be noted that, in the embodiment of the present application, the antenna radiates or receives signals with different frequencies from the fed transmitting or receiving signals, which means that when the DBF phased array radar antenna is regarded as a "black box", the signal input and signal output ends are different from the signals of the antenna radiating and receiving ends. For the vector network analyzer, the S parameter test can be performed only when the output signal and the input signal are of the same frequency, otherwise, the S parameter test cannot be performed, the S parameter test aims to obtain tested amplitude and phase information, and near-field-to-far-field conversion can be performed only by the amplitude and phase information, so that the required far-field pattern information is obtained.
In order to solve the problems, the application provides a DBF phased array radar antenna empty feed near field test method, wherein the empty feed near field test of the DBF phased array radar antenna emission and receiving is realized by a frequency conversion reference channel, signals radiated or received by one side of the DBF phased array radar antenna are in the same frequency with the emission or receiving signals fed in by the other side, so that a vector network analyzer can test amplitude and phase parameters of the DBF phased array radar antenna to obtain amplitude and phase information necessary for the empty feed near field test, and the empty feed near field test of the DBF phased array radar antenna is realized based on the amplitude and phase information.
In the embodiment of the application, the overall command of the whole transmitting or receiving test is a test industrial personal computer, a test system of the phased array radar antenna is arranged on the test industrial personal computer, and the test system is responsible for coordinating, scheduling and controlling related equipment and collecting and post-processing related test data. The test industrial personal computer is controlled and issued with instructions through a network, and the equipment controlled through network port communication comprises a radar measurement and control platform, a vector network analyzer, a scanning frame controller and a time sequence controller.
In one embodiment, the radar measurement and control platform is responsible for translating information such as frequency and wave position transmitted by the test industrial personal computer into instructions executable by the DBF phased array radar antenna, receiving digital data information from a digital signal processor in the DBF phased array radar antenna, and sending the digital data information back to the test industrial personal computer. In one embodiment, the interface between the radar measurement and control station and the DBF phased array radar antenna is varied, with serial, optical or 1553B interfaces, and different radars. The test industrial personal computer is connected with the radar measurement and control platform through a network, and the radar measurement and control platform is controlled by the test industrial personal computer.
In one embodiment, the vector network analyzer is a microwave standard instrument, which has a radio frequency port, a control port (LAN port), a trigger port and the like, and is responsible for transmitting and receiving radio frequency signals with the same frequency. The test industrial personal computer is connected with the vector network analyzer through a network, and the vector network analyzer is also controlled by the test industrial personal computer. The vector network analyzer is connected with the scanning frame sampling probe through a radio frequency cable assembly, radio frequency signals are transmitted by the radio frequency cable assembly, and the radio frequency cable assembly is arranged in a scanning frame drag chain. The vector network analyzer is connected with the variable frequency reference channel through the radio frequency cable assembly, and radio frequency signals are transmitted by the radio frequency cable assembly.
In one embodiment, the timing controller is the "timing master schedule" of the whole system, and is responsible for transmitting and receiving timing trigger pulses, coordinating the timing of the frequency and wave position of the DBF phased array radar, coordinating the timing of the output, input and acquisition of radio frequency signals of the vector network analyzer, and coordinating the timing of the walking of the scanning frame, wherein the timing is triggered and triggered by the low-frequency pulse signals of the BNC interface. The time sequence pulse between the time sequence controller and the radar measurement and control platform is responsible for interruption and synchronization, the time sequence pulse between the time sequence controller and the vector network analyzer is responsible for acquisition, triggering and synchronization, and the time sequence control receives the position pulse of the scanning frame controller. The time sequence controller is communicated with the test industrial personal computer through a network port and is controlled by the test industrial personal computer. However, once the test industrial personal computer commands are issued, the time schedule controller completes the time schedule overall coordination responsibility, and coordinates the work of each device according to the beat. The scanning frame controller is responsible for controlling the track, speed and in-place triggering notification of the scanning frame movement. The scanning frame controller is controlled by the test industrial personal computer.
Specifically, when the DBF phased array radar antenna based on the digital transceiver component performs emission test, the test industrial personal computer controls the near field scanning frame to complete required sampling movement by controlling the scanning frame controller so as to move the near field scanning frame to a preset sampling position, meanwhile, the test industrial personal computer also controls the DBF phased array radar antenna through the radar measurement and control platform so that the DBF phased array radar antenna forms a first radio frequency signal to be tested, the first radio frequency signal to be tested is radiated to a space through an antenna unit in the DBF phased array radar antenna, then the first radio frequency signal to be tested is collected through a sampling probe in the near field scanning frame positioned at the preset sampling position, and the first radio frequency signal to be tested is sent into a test channel of the vector network analyzer through the radio frequency cable component so as to be used as a radio frequency test signal of the DBF phased array radar antenna.
Fig. 2 is a schematic flow chart of a transmission test of a DBF phased array radar antenna according to an embodiment of the present application. As shown in fig. 2, when the DBF phased array radar antenna based on the digital transceiver module performs emission test, the test industrial personal computer moves the scanning frame to a preset sampling position through the scanning frame controller, and controls the DBF phased array radar antenna based on the digital transceiver module to form first radio frequency signals to be tested with different frequency points and different wave positions through the radar measurement and control platform, and radiates the first radio frequency signals to the space through the antenna unit, wherein the first radio frequency signals to be tested are transmitted in the space, collected by the sampling probe of the near-field scanning frame, and then sent to the test channel of the vector network analyzer through the radio frequency cable module to serve as radio frequency test signals.
In one embodiment of the application, the sample positions preset for the near field gantry comprise at least one. Under the condition that the preset sampling position exceeds one and the empty feed near field test of the first preset sampling position is completed, the test industrial personal computer controls the near field scanning frame through the scanning frame controller, moves the near field scanning frame to the second preset sampling position, and performs emission test and receiving test on the DBF phased array radar antenna at the second preset sampling position until the empty feed near field test of all preset sampling positions corresponding to the DBF phased array radar antenna is completed.
102. The method comprises the steps of mixing a clock signal and a local oscillator coupling port signal of a DBF phased array radar antenna through a frequency conversion reference channel to obtain a radio frequency reference signal with the same frequency as a radio frequency test signal, and testing the ratio between the radio frequency test signal and the radio frequency reference signal through a vector network analyzer to obtain the amplitude and the phase of the DBF phased array radar antenna.
Specifically, when the DBF phased array radar antenna based on the digital receiving and transmitting assembly performs transmission test, the test industrial personal computer can realize control of the DBF phased array radar antenna by communicating with the radar measurement and control platform, so that a clock signal and a local oscillator coupling port signal of a first radio frequency signal to be tested formed by the DBF phased array radar antenna are sent to a variable frequency reference channel, frequency mixing processing is performed on the clock signal and the local oscillator coupling port signal through the variable frequency reference channel, an upper sideband signal after the frequency mixing processing is further obtained, and then the upper sideband signal is sent to a reference channel of a vector network analyzer and is used as a radio frequency reference signal of the DBF phased array radar antenna. It should be noted that, in the embodiment of the present application, the variable frequency reference channel is used to adjust the radio frequency reference signal to be the same frequency as the radio frequency test signal.
The test industrial personal computer controls the vector network analyzer so that the vector network analyzer samples the radio frequency test signals in the test channel and the radio frequency reference signals in the reference channel, tests the ratio between the sampled radio frequency test signals and the radio frequency reference signals, further obtains the amplitude and the phase of the DBF phased array radar antenna according to the ratio, and sends the amplitude and the phase of the DBF phased array radar antenna to the test industrial personal computer so that the test industrial personal computer stores the amplitude and the phase.
As shown in fig. 2, when the DBF phased array radar antenna based on the digital transceiver module performs emission test, the test industrial personal computer is responsible for controlling the vector network analyzer to collect radio frequency test signals, and by setting the control variable frequency reference channel, the radio frequency reference signal output by the variable frequency reference channel is adjusted to be the same frequency as the radio frequency test signal. The method comprises the steps of synchronously sending a clock signal and a local oscillator coupling port signal of a signal to be detected into a frequency conversion reference channel, and adjusting the clock signal and the local oscillator coupling port signal through the frequency conversion reference channel to ensure that the mixed radio frequency reference signal and a radio frequency test signal radiated by an antenna space are in the same frequency. The local oscillation signal and the intermediate frequency signal generated by the frequency conversion reference channel are mixed to obtain the same-frequency radio frequency reference signal of the first radio frequency signal to be detected transmitted by the antenna. The test industrial personal computer controls the vector network analyzer to start sampling, tests the ratio between the radio frequency test signal of the test channel and the radio frequency reference signal of the reference channel at the moment, so as to obtain the amplitude and the phase required by the S21 parameter, and transmits the amplitude and the phase back to the test industrial personal computer through a network for storage. It should be noted that, the timing controller in the embodiment of the present application is responsible for coordinating the test timing of the radar measurement and control station, the vector network analyzer, and the near field scanning frame.
In one embodiment, after the up-conversion input signal enters, the signal power level is adjusted to a proper value through attenuation amplification, then the up-conversion input signal enters an up-conversion mixer, and the mixed signal is output after high-pass filtering. The up-converted and down-converted input signals are both microwave radio frequency signals. It should be noted that, in the embodiment of the present application, the frequency is 10GHz-40GHz, the external reference clock is a clock signal of 10MHz-100MHz, and is a clock reference signal of the system, and one is a high-frequency radio frequency signal and the other is a low-frequency clock signal.
In one embodiment, after the down-conversion input signal enters, the signal power level is adjusted to a proper value through attenuation amplification, then the down-conversion input signal enters a down-conversion mixer, and the mixed signal is output after low-pass filtering and amplification. After the external reference signal enters, the phase-locked crystal oscillator firstly passes through the phase-locked crystal oscillator, the output of the phase-locked crystal oscillator enters a general 10-20 GHz frequency hopping module, the output signal is subjected to frequency conversion to the required local oscillation frequency by a later frequency doubling module, and then the signal is subjected to power division amplification and output to up-conversion and down-conversion.
103. And when a test is received, dividing a second radio frequency signal to be tested of the vector network analyzer into a main microwave radio frequency signal and a branch microwave radio frequency signal through a directional coupler, and radiating the main microwave radio frequency signal to a space through a near field scanning frame so as to enable the DBF phased array radar antenna to obtain digital test data.
Specifically, when a DBF phased array radar antenna based on a digital receiving and transmitting assembly performs receiving test, a testing industrial personal computer controls a vector network analyzer, and sends a second radio frequency signal to be tested to a directional coupler through a testing channel of the vector network analyzer, and then the second radio frequency signal to be tested is divided according to a preset proportion through the directional coupler, and a main microwave radio frequency signal and a branch microwave radio frequency signal corresponding to the second radio frequency signal to be tested are obtained, and then the main microwave radio frequency signal is sent to a sampling probe of a near-field scanning frame through a radio frequency cable assembly, and the branch microwave radio frequency signal is sent to a radio frequency input port of a frequency conversion reference channel through the radio frequency cable assembly.
The testing industrial personal computer radiates the main path microwave radio frequency signals to the space through the sampling probe of the near-field scanning frame, receives the main path microwave radio frequency signals through the antenna unit in the DBF phased array radar antenna, performs down-conversion processing on the main path microwave radio frequency signals to form intermediate frequency signals corresponding to the main path microwave radio frequency signals, performs digital sampling on the intermediate frequency signals corresponding to the main path microwave radio frequency signals, then sends digital I/Q signals corresponding to the main path microwave radio frequency signals after digital sampling to the digital signal processor, and takes the digital I/Q signals corresponding to the main path microwave radio frequency signals as digital test data of the DBF phased array radar antenna.
Fig. 3 is a schematic flow chart of a receiving test of a DBF phased array radar antenna according to an embodiment of the present application. As shown in fig. 3, when the DBF phased array radar antenna based on the digital transceiver module performs a receiving test, the test industrial personal computer moves the scanning frame to a preset sampling position through the scanning frame controller, and outputs the transmitted second radio frequency signal to be tested to the directional coupler through the test channel by the vector network analyzer, and sends 90% of main microwave radio frequency signals to the sampling probe of the near-field scanning frame through the radio frequency cable module by the directional coupler, and radiates the main microwave radio frequency signals to the space by the sampling probe. The space radiation signals are transmitted in space, received by an antenna unit in the DBF phased array radar antenna, subjected to down-conversion processing to form intermediate frequency signals corresponding to main microwave radio frequency signals, subjected to A/D sampling to form digital I/Q signals corresponding to the main microwave radio frequency signals, and sent to a digital signal processor in the DBF phased array radar antenna, wherein the digital I/Q signals corresponding to the main microwave radio frequency signals are used as digital test data of the DBF phased array radar antenna. The test industrial personal computer controls the radar measurement and control platform, and the clock input and the local oscillator input of the DBF digital phased array radar are also connected to the response port of the frequency conversion reference channel. Meanwhile, 10% of branch microwave radio frequency signals are sent to a radio frequency input port of the variable frequency reference channel through the directional coupler through the radio frequency cable assembly. Through the setting control of a test industrial personal computer, a frequency conversion reference channel can down-convert a branch microwave radio frequency signal, a clock signal and a local oscillator coupling port signal into an intermediate frequency signal with the same frequency as digital test data of the DBF phased array radar antenna, and A/D sampling is carried out on the intermediate frequency signal corresponding to the branch microwave radio frequency signal through the frequency conversion reference channel to form a digital I/Q signal corresponding to the branch microwave radio frequency signal, so that the digital I/Q signal corresponding to the branch microwave radio frequency signal is sent into a digital signal processor and is used as digital reference data of the DBF phased array radar antenna. And then, the digital reference data of the reference channels are also sent back to the test industrial personal computer through the radar measurement and control platform.
The test industrial personal computer tests the digital test data and the digital reference data obtained from the digital signal processor, and then the digitized amplitude and phase can be obtained. It should be noted that, the test of the digital test data and the digital reference data by the test industrial personal computer is similar to the test processing of the radio frequency test signal and the radio frequency reference signal by the vector network analyzer, and the vector network analyzer mixes the radio frequency signal into the intermediate frequency by its own signal processor and then samples the intermediate frequency, and this step is realized by the DBF phased array radar antenna.
In one embodiment, the directional coupler is a standard microwave passive three-port device, similar to a microwave passive power divider. One port is a radio frequency input port, one port is a radio frequency output port, and one port is a coupling output port. The principle is that one path of radio frequency signal enters from a radio frequency input port, most of energy is output from a radio frequency output port (for example, 90% of energy), and a small part of energy is coupled out from a coupling circuit designed in the interior (for example, 10% of energy). The directional coupler is a microwave passive device commonly used in microwave measurement. In the DBF phased array radar antenna receiving test of the application, a second radio frequency signal to be detected, which is given by a signal source in a vector network analyzer, is subjected to radio frequency input through a directional coupler, then most of energy signals of radio frequency output are given to a sampling probe of a near-field scanning frame, and a small part of energy is given to radio frequency input signals of a frequency conversion reference channel for a down-conversion mixer through a coupling output port. The purpose of the directional coupler is to ensure that digital reference data passing through a variable frequency reference channel is homologous to signals transmitted by a sampling probe and received by a DBF phased array radar antenna, and the accuracy of a test phase can be ensured only by the homology.
In one embodiment, the digital I/Q signal of the test channel is a digital received signal provided by the digital transceiver to the digital signal processor, and for a DBF phased array radar antenna, there are as many radiating elements as there are corresponding test channels. For example: the DBF phased array radar antenna with 256 units is correspondingly provided with 256 digital transmitting/receiving channels, when receiving test is carried out, the 256 digital receiving channels are all test channels, and the signal of each digital channel is compared with the signal of the reference channel from the frequency conversion reference channel, so that accurate phase information is obtained.
104. And mixing the branch microwave radio frequency signal, the clock signal and the local oscillator coupling port signal through a frequency conversion reference channel to obtain digital reference data with the same frequency as the digital test data, and determining the amplitude and the phase of the DBF phased array radar antenna according to the ratio between the digital test data and the digital reference data so as to realize the air-fed near-field test of the DBF phased array radar antenna.
Specifically, when a DBF phased array radar antenna based on a digital transceiver component performs receiving test, a test industrial personal computer performs communication with a radar measurement and control platform to control the DBF phased array radar antenna, and sends a clock signal and a local oscillator coupling port signal of the DBF phased array radar antenna to a variable frequency reference channel, so that a down-conversion process can be performed on a branch microwave radio frequency signal, the clock signal and the local oscillator coupling port signal through the variable frequency reference channel, an intermediate frequency signal with the same frequency as digital test data of the DBF phased array radar antenna is obtained, then the intermediate frequency signal corresponding to the branch microwave radio frequency signal is subjected to digital sampling, a digital I/Q signal corresponding to the digital sampled branch microwave radio frequency signal is sent to a digital signal processor, and the digital I/Q signal of the branch microwave radio frequency signal is used as digital reference data of the DBF phased array radar antenna.
In one embodiment, for a dual port vector network analyzer having a source and four receivers within it, the four receivers are 2 test receivers and 2 reference receivers, respectively, and a comparison test (or ratio test) of the test receivers and the reference receivers must be performed in order to obtain accurate phase signals. For phase signal test, the ratio test is carried out on one path of transmitting signal and one path of receiving signal to obtain phase information; or no signal is transmitted, that is, a path of received test signal and a path of reference received signal are subjected to ratio test to obtain phase information. If only one path of received signal is not provided with phase information, the phase information can be obtained only by a comparison test of one or two paths of received signals, the comparison test is realized by the vector network analyzer, the vector network analyzer is used as a basic function of a standard instrument, and the phase information after comparison can be obtained only by controlling and setting the comparison of two paths of signals of the vector network analyzer.
The above is a method embodiment of the present application. Based on the same inventive concept, the embodiment of the application also provides DBF phased array radar antenna air-fed near field test equipment, and the structure of the equipment is shown in fig. 4.
Fig. 4 is a schematic diagram of an internal structure of a DBF phased array radar antenna air-fed near-field test device according to an embodiment of the present application. As shown in fig. 4, the apparatus includes:
at least one processor;
and a memory communicatively coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
during emission test, acquiring a first radio frequency signal to be tested of a DBF phased array radar antenna based on a digital receiving and transmitting assembly through a near field scanning frame, and sending the first radio frequency signal to be tested to a vector network analyzer to serve as a radio frequency test signal;
mixing a clock signal and a local oscillator coupling port signal of the DBF phased array radar antenna through a frequency conversion reference channel to obtain a radio frequency reference signal with the same frequency as that of a radio frequency test signal, and testing the ratio between the radio frequency test signal and the radio frequency reference signal through a vector network analyzer to obtain the amplitude and the phase of the DBF phased array radar antenna;
when receiving a test, dividing a second radio frequency signal to be tested of the vector network analyzer into a main microwave radio frequency signal and a branch microwave radio frequency signal through a directional coupler, and radiating the main microwave radio frequency signal to a space through a near field scanning frame so as to enable the DBF phased array radar antenna to obtain digital test data;
And mixing the branch microwave radio frequency signal, the clock signal and the local oscillator coupling port signal through a frequency conversion reference channel to obtain digital reference data with the same frequency as the digital test data, and determining the amplitude and the phase of the DBF phased array radar antenna according to the ratio between the digital test data and the digital reference data so as to realize the air-fed near-field test of the DBF phased array radar antenna.
The embodiment of the application also provides a nonvolatile computer storage medium, which stores computer executable instructions, wherein the computer executable instructions are configured to:
during emission test, acquiring a first radio frequency signal to be tested of a DBF phased array radar antenna based on a digital receiving and transmitting assembly through a near field scanning frame, and sending the first radio frequency signal to be tested to a vector network analyzer to serve as a radio frequency test signal;
mixing a clock signal and a local oscillator coupling port signal of the DBF phased array radar antenna through a frequency conversion reference channel to obtain a radio frequency reference signal with the same frequency as that of a radio frequency test signal, and testing the ratio between the radio frequency test signal and the radio frequency reference signal through a vector network analyzer to obtain the amplitude and the phase of the DBF phased array radar antenna;
when receiving a test, dividing a second radio frequency signal to be tested of the vector network analyzer into a main microwave radio frequency signal and a branch microwave radio frequency signal through a directional coupler, and radiating the main microwave radio frequency signal to a space through a near field scanning frame so as to enable the DBF phased array radar antenna to obtain digital test data;
And mixing the branch microwave radio frequency signal, the clock signal and the local oscillator coupling port signal through a frequency conversion reference channel to obtain digital reference data with the same frequency as the digital test data, and determining the amplitude and the phase of the DBF phased array radar antenna according to the ratio between the digital test data and the digital reference data so as to realize the air-fed near-field test of the DBF phased array radar antenna.
The embodiments of the present application are described in a progressive manner, and the same and similar parts of the embodiments are all referred to each other, and each embodiment is mainly described in the differences from the other embodiments. In particular, for the apparatus and medium embodiments, the description is relatively simple, as it is substantially similar to the method embodiments, with reference to the section of the method embodiments being relevant.
The foregoing describes certain embodiments of the present application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
The devices and media provided in the embodiments of the present application are in one-to-one correspondence with the methods, so that the devices and media also have similar beneficial technical effects as the corresponding methods, and since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media are not repeated here.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (10)
1. The DBF phased array radar antenna air feed near field test method is characterized by comprising the following steps:
during emission test, acquiring a first radio frequency signal to be tested of a DBF phased array radar antenna based on a digital receiving and transmitting assembly through a near field scanning frame, and sending the first radio frequency signal to be tested to a vector network analyzer to serve as a radio frequency test signal;
mixing a clock signal and a local oscillator coupling port signal of the DBF phased array radar antenna through a frequency conversion reference channel to obtain a radio frequency reference signal with the same frequency as the radio frequency test signal, and testing the ratio between the radio frequency test signal and the radio frequency reference signal through the vector network analyzer to obtain the amplitude and the phase of the DBF phased array radar antenna;
when receiving a test, dividing a second radio frequency signal to be tested of the vector network analyzer into a main microwave radio frequency signal and a branch microwave radio frequency signal through a directional coupler, and radiating the main microwave radio frequency signal to a space through the near field scanning frame so as to enable the DBF phased array radar antenna to obtain digital test data;
And mixing the branch microwave radio frequency signals, the clock signals and the local oscillator coupling port signals through the variable frequency reference channel to obtain digital reference data with the same frequency as the digital test data, and determining the amplitude and the phase of the DBF phased array radar antenna according to the ratio between the digital test data and the digital reference data so as to realize the air-fed near-field test of the DBF phased array radar antenna.
2. The method for testing the empty feed near field of the DBF phased array radar antenna according to claim 1, wherein during the transmitting test, a first radio frequency signal to be tested of the DBF phased array radar antenna based on the digital transceiver component is collected through a near field scanning frame, and the first radio frequency signal to be tested is sent to a vector network analyzer to be used as a radio frequency test signal, specifically comprising:
when a DBF phased array radar antenna based on a digital receiving and transmitting assembly performs emission test, a test industrial personal computer controls a near-field scanning frame through a scanning frame controller and moves the near-field scanning frame to a preset sampling position;
the DBF phased array radar antenna is controlled through a radar measurement and control platform so that the DBF phased array radar antenna forms a first radio frequency signal to be tested, and the first radio frequency signal to be tested is radiated to space through an antenna unit in the DBF phased array radar antenna;
And acquiring the first radio frequency signal to be tested through a sampling probe positioned in a near-field scanning frame at the preset sampling position, and transmitting the first radio frequency signal to be tested into a test channel of a vector network analyzer through a radio frequency cable assembly so as to take the first radio frequency signal to be tested as a radio frequency test signal of the DBF phased array radar antenna.
3. The method for testing the air feed near field of the DBF phased array radar antenna according to claim 1, wherein the step of mixing the clock signal and the local oscillator coupling port signal of the DBF phased array radar antenna through a frequency conversion reference channel to obtain a radio frequency reference signal with the same frequency as the radio frequency test signal specifically comprises the steps of:
the test industrial personal computer is communicated with the radar measurement and control platform to control the DBF phased array radar antenna, and a clock signal of a first radio frequency signal to be tested and a local oscillator coupling port signal formed by the DBF phased array radar antenna are sent to a frequency conversion reference channel;
carrying out frequency mixing processing on the clock signal and the local oscillator coupling port signal through the frequency conversion reference channel, and obtaining an upper sideband signal after frequency mixing processing;
Transmitting the upper sideband signal into a reference channel of the vector network analyzer, and taking the upper sideband signal as a radio frequency reference signal of the DBF phased array radar antenna; the variable frequency reference channel is used for adjusting the radio frequency reference signal to be in the same frequency with the radio frequency test signal.
4. The method for testing the air feed near field of the DBF phased array radar antenna according to claim 1, wherein the step of testing the ratio between the radio frequency test signal and the radio frequency reference signal by the vector network analyzer to obtain the amplitude and the phase of the DBF phased array radar antenna specifically comprises the steps of:
the testing industrial personal computer controls the vector network analyzer so that the vector network analyzer samples radio frequency test signals in a test channel and radio frequency reference signals in a reference channel, and tests the ratio between the sampled radio frequency test signals and the radio frequency reference signals;
and obtaining the amplitude and the phase of the DBF phased array radar antenna according to the ratio, and sending the amplitude and the phase of the DBF phased array radar antenna to the test industrial personal computer so that the test industrial personal computer can store the amplitude and the phase.
5. The method for testing the air feed near field of the DBF phased array radar antenna according to claim 1, wherein the dividing the second radio frequency signal to be tested of the vector network analyzer into a main microwave radio frequency signal and a branch microwave radio frequency signal through a directional coupler during the receiving test specifically comprises:
when a DBF phased array radar antenna based on a digital receiving and transmitting assembly performs receiving test, a testing industrial personal computer controls the vector network analyzer, and sends a second radio frequency signal to be tested to a directional coupler through a testing channel of the vector network analyzer;
dividing the second radio frequency signal to be detected according to a preset proportion by the directional coupler, and obtaining a main microwave radio frequency signal and a branch microwave radio frequency signal corresponding to the second radio frequency signal to be detected;
and the main microwave radio frequency signal is sent to the sampling probe of the near-field scanning frame through a radio frequency cable assembly, and the branch microwave radio frequency signal is sent to the radio frequency input port of the variable frequency reference channel through the radio frequency cable assembly.
6. The method for testing the empty feed near field of the DBF phased array radar antenna according to claim 1, wherein the main microwave radio frequency signal is radiated to space through the near field scanning frame, so that the DBF phased array radar antenna obtains digital test data, specifically comprising:
Radiating the main path microwave radio frequency signal to a space through a sampling probe of a near field scanning frame, and receiving the main path microwave radio frequency signal through an antenna unit in a DBF phased array radar antenna;
performing down-conversion treatment on the main path microwave radio frequency signal to form an intermediate frequency signal corresponding to the main path microwave radio frequency signal, and performing digital sampling on the intermediate frequency signal corresponding to the main path microwave radio frequency signal;
and sending the digital I/Q signal corresponding to the main microwave radio frequency signal after digital sampling to a digital signal processor, and taking the digital I/Q signal corresponding to the main microwave radio frequency signal as digital test data of the DBF phased array radar antenna.
7. The method for testing the air feed near field of the DBF phased array radar antenna according to claim 1, wherein the frequency conversion reference channel mixes the branch microwave radio frequency signal, the clock signal and the local oscillator coupling port signal to obtain digital reference data with the same frequency as the digital test data, and the method specifically comprises:
the test industrial personal computer is communicated with the radar measurement and control platform to control the DBF phased array radar antenna, and a clock signal and a local oscillator coupling port signal of the DBF phased array radar antenna are sent to the variable frequency reference channel;
Performing down-conversion processing on the branch microwave radio frequency signals, the clock signals and the local oscillator coupling port signals through the frequency conversion reference channel, and obtaining intermediate frequency signals with the same frequency as the digital test data of the DBF phased array radar antenna;
and carrying out digital sampling on the intermediate frequency signal corresponding to the branch microwave radio frequency signal, sending the digital I/Q signal corresponding to the branch microwave radio frequency signal after digital sampling to a digital signal processor, and taking the digital I/Q signal of the branch microwave radio frequency signal as digital reference data of the DBF phased array radar antenna.
8. The DBF phased array radar antenna empty feed near field test method according to claim 2, wherein the sampling position preset by the near field scanning frame at least comprises one;
under the condition that the preset sampling position exceeds one and the air feed near field test of the first preset sampling position is completed, the test industrial personal computer controls the near field scanning frame through the scanning frame controller;
and moving the near-field scanning frame to a second preset sampling position, and performing emission test and receiving test on the DBF phased array radar antenna at the second preset sampling position until the empty feed near-field test of all preset sampling positions corresponding to the DBF phased array radar antenna is completed.
9. A DBF phased array radar antenna feed-through near field test apparatus, the apparatus comprising:
at least one processor;
and a memory communicatively coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a DBF phased array radar antenna feed-through near field test method as claimed in any one of claims 1 to 8.
10. A non-transitory computer storage medium storing computer-executable instructions, the computer-executable instructions configured to:
a DBF phased array radar antenna feed-through near field test method according to any one of claims 1-8.
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