CN114070425A - Phased array radio frequency wave beam pointing switching time test system and method - Google Patents
Phased array radio frequency wave beam pointing switching time test system and method Download PDFInfo
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- CN114070425A CN114070425A CN202111349758.2A CN202111349758A CN114070425A CN 114070425 A CN114070425 A CN 114070425A CN 202111349758 A CN202111349758 A CN 202111349758A CN 114070425 A CN114070425 A CN 114070425A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
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- H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
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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
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
A phased array radio frequency wave beam pointing switching time test system and a method belong to the technical field of phased array system test, and solve the problems of inconvenient measurement, complex steps and inaccurate result of the existing radio frequency wave beam pointing switching time test method; mixing radio frequency signals to zero frequency by adopting a same-frequency mixing mode, converting the phase change of the radio frequency signals which are difficult to observe and measure into amplitude change on a time domain, amplifying the amplitude change by a stylus of an oscilloscope, visually measuring by the oscilloscope, unifying the measurement of beam pointing parameters and the phase change of the radio frequency signals on the oscilloscope, and directly obtaining the radio frequency beam pointing switching time comprising beam pointing parameter transmission time, phase shift code calculation time, phase shift code sending time and phase shift code action time by measuring the difference of the change time of the beam pointing parameters and the phase shift code; the adopted instrument equipment and the test accessories are conventional equipment and instruments, special test equipment does not need to be designed and manufactured, and the use difficulty and threshold of the test system are reduced.
Description
Technical Field
The invention belongs to the technical field of phased array system testing, and relates to a phased array radio frequency beam pointing switching time testing system and a phased array radio frequency beam pointing switching time testing method, which are applied to testing of various civil and military phased array systems.
Background
The phased array system has the great characteristic of excellent beam scanning real-time performance, and the radio frequency beam pointing switching time is the quantitative reflection of the beam scanning real-time performance by adopting the phased array system formed by the radio frequency beam. The beam pointing switching time comprises parts such as beam pointing parameter transmission time, phase shift code calculation time, phase shift code sending time, phase shifter action time and the like, and comprises measurement of digital signals and radio frequency signals.
An oscilloscope is generally used for testing the time domain characteristics of signals, but the oscilloscope is only limited to digital signals and low-frequency signals, a modulation domain analyzer is required for measuring the change relation of frequency phase relative to time, the instrument is relatively lacked, and the special test containing digital and radio frequency signals, namely beam direction switching, is difficult to measure. The existing testing method adopts a sectional measuring mode to test the radio frequency beam pointing switching time, for example, an oscilloscope is adopted to measure the time from the sending of a control signal to the sending of a phase shift signal, the time comprises the transmission and calculation time, and then a modulation domain analyzer is adopted to measure the phase change time of a radio frequency signal. However, this method requires a signal measurement point between the phase shift code calculation module and the phase shifter, the signal measurement point is usually located inside the product, the arrangement is inconvenient, and the method omits part of the internal transmission path, which results in inaccurate measurement.
In the prior art, the chinese patent application signal source testing system and method based on radio frequency switch matrix, published on date 2015, 5/6/and published on number CN104601254A, automatically switches radio frequency channels according to the requirements of test cases, and builds a test environment required by test items, thereby reducing used test resources, simplifying test flow and improving flexibility of the system; but the document does not address how to test the radio frequency beam pointing switching time.
Disclosure of Invention
The invention aims to design a system and a method for testing phased array radio frequency beam pointing switching time, so as to solve the problems of inconvenience in measurement, complex steps and inaccurate result of the conventional method for testing the radio frequency beam pointing switching time.
The invention solves the technical problems through the following technical scheme:
a phased array radio frequency beam pointing switch time test system, comprising: the device comprises an upper computer (1), a power divider (2), a frequency mixer (3), a switch matrix (4), a signal source (5), an oscilloscope (6) and a product to be detected (7); the output port of the signal source (5) is connected with the input port of the power divider (2), one path of the output port of the power divider (2) is connected to the input port of the product to be detected (7), and the other path is connected to the mixer (3); the output port of the product to be tested (7) is correspondingly connected with the input port of the switch matrix (4) according to the port serial number, the output port of the switch matrix (4) is connected with the radio frequency port of the mixer (3), and the intermediate frequency output port of the mixer (3) is connected to the port No. 1 of the oscilloscope (6) by adopting an oscilloscope probe or an SMA/BNC conversion line; the upper computer (1) is connected with a product (7) to be tested through an R422 interface, and a TX + or TX-line of the RS422 interface is led out independently and is connected to a No. 2 port of the oscilloscope (6); the upper computer (1) is connected with the signal source (5), the oscilloscope (6) and the switch matrix (4) by adopting a network interface or a GPIB interface; the upper computer (1) is used for configuring the working mode, the beam pointing parameter and the instruction execution time of the product (7) to be tested, sending the parameter information to the product (7) to be tested according to a communication protocol, acquiring the remote measurement parameter of the product (7) to be tested, controlling the switch matrix (4) to be switched to a corresponding test channel, and configuring the state parameters of the signal source (5) and the oscilloscope (6); the power divider (2) is used for dividing the test signal into two parts, inputting the product to be tested (7) and the frequency mixer (3) as a test input signal and a frequency mixing local oscillator signal; the frequency mixer (3) is used for mixing an output signal of a product to be tested (7) with a test input signal to generate a zero-frequency signal for testing; the switch matrix (4) is used for switching the test access to a corresponding channel of a product (7) to be tested according to an instruction of the upper computer (1); the signal source (5) is used for generating a dot frequency signal required by testing; the oscilloscope (6) is used for capturing amplitude change of the zero-frequency signal; collecting data sent by a port of an upper computer (1); the product (7) to be tested works in different working modes according to different instructions; and receiving the beam pointing parameters and the instruction execution time through the upper computer (1), and changing the channel phase shift quantity according to the pointing parameters and the instruction execution time.
The invention adopts a same-frequency mixing mode to mix radio frequency signals to zero frequency, converts the phase change of radio frequency signals which are difficult to observe and measure into amplitude change on a time domain, and combines the measurement of a digital signal of a beam pointing parameter and the measurement of the phase change of the radio frequency signals on an oscilloscope through the direct measurement of the oscilloscope after the phase change of the radio frequency signals is amplified by a stylus of the oscilloscope; the instrument equipment and the test accessories adopted by the test system are conventional equipment and instruments, special test equipment does not need to be designed and manufactured, and the use difficulty and threshold of the test system are reduced.
As a further improvement of the technical scheme of the invention, the upper computer (1) comprises: the device comprises an analog data sending module, a remote measuring module, an instrument parameter configuration module and a test result output module;
the analog data sending module is used for configuring the working mode, the beam pointing parameter and the instruction execution time of the product (7) to be tested, coding according to a communication protocol and sending the coded data to the product (7) to be tested;
the remote measuring module is used for receiving the working state indication, the channel phase shift code and the abnormal state indication data returned by the product (7) to be measured, decoding according to a communication protocol and displaying on a test interface of the upper computer (1);
the instrument parameter configuration module is used for configuring the output signal frequency and power of the signal source (5), configuring a state parameter file called by the oscilloscope (6), and controlling the switch matrix (4) to be switched to a test channel corresponding to the product to be tested (7) according to the test requirement to carry out channel-by-channel test;
and the test result output module is used for reading the test data of the oscilloscope (6), calculating the test data and outputting the test result.
As a further improvement of the technical scheme of the invention, the power divider (2) adopts a general one-to-two radio frequency power divider.
As a further improvement of the technical scheme of the invention, the passive mixer (3) is selected as the mixer (3).
As a further improvement of the technical scheme of the invention, the working frequency ranges of the power divider (2) and the mixer (3) cover the test frequency of the product (7) to be tested.
As a further improvement of the technical scheme of the invention, the switch matrix (4) has the functions of local control and remote control, a tester can manually switch the test channels in the local control state, and the upper computer (1) switches the test channels one by one in the remote control state.
A test method applied to the phased array radio frequency beam pointing switching time test system comprises the following steps:
a signal source (5) generates a radio frequency signal of the working frequency of the product (7) to be tested, the radio frequency signal is divided into two parts by a power divider (2), one part is used as the local oscillation signal, and the other part is used as a test input signal;
mixing the radio frequency signal output by the product (7) to be tested with the same frequency signal of the local oscillation signal and inputting the mixed frequency signal into the frequency mixer (3) so as to obtain a zero frequency signal;
detecting an RS422 data sending port signal of the upper computer (1) as a test trigger signal source, namely a beam switching start time mark, by using an oscilloscope (6);
the completion of amplitude jump of the zero-frequency signal is detected by an oscilloscope (6) and is used as the test ending time, namely a phase-shifting action completion mark;
measuring the time interval from the beginning of the first frame signal jump to the completion of the zero-frequency signal amplitude jump by an RS422 data port through an oscilloscope (6) to obtain the test result of the beam switching time of the current channel;
the upper computer (1) controls the switch matrix (4) and the product (7) to be tested, the testing is repeatedly carried out channel by channel, and the worst value is taken as the testing result of the beam switching time and recorded.
The invention has the advantages that:
the invention adopts a same-frequency mixing mode to mix radio frequency signals to zero frequency, converts the phase change of radio frequency signals which are difficult to observe and measure into amplitude change on a time domain, and combines the measurement of a digital signal of a beam pointing parameter and the measurement of the phase change of the radio frequency signals on an oscilloscope through the direct measurement of the oscilloscope after the phase change of the radio frequency signals is amplified by a stylus of the oscilloscope; the instrument equipment and the test accessories adopted by the test system are conventional equipment and instruments, special test equipment does not need to be designed and manufactured, and the use difficulty and threshold of the test system are reduced.
Drawings
Fig. 1 is a block diagram of a phased array radio frequency beam pointing switching time test system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for testing phased array RF beam pointing switching time according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a phase change of a channel before and after beam direction switching according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a beam pointing data transmission start flag and a phase shift completion flag converted to zero frequency acquired by a phased array radio frequency beam pointing switching time test according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further described by combining the drawings and the specific embodiments in the specification:
example one
As shown in fig. 1, a phased array radio frequency beam pointing switching time test system provided by the embodiment of the present invention includes: the device comprises an upper computer 1, a power divider 2, a mixer 3, a switch matrix 4, a signal source 5, an oscilloscope 6 and a product 7 to be tested.
The output port of the signal source 5 is connected with the input port of the power divider 2 by adopting a radio frequency cable, one path of the output port of the power divider 2 is connected with the input port of the product 7 to be detected by adopting the radio frequency cable to be used as an input signal of the product 7 to be detected, and the other path is connected with the frequency mixer 3 to be used as a local oscillation signal.
The output port of the product 7 to be tested is connected with the input port of the switch matrix 4 by a radio frequency cable according to the corresponding port serial number; the switch matrix 4 has the functions of local control and remote control; the local control function is used for manually switching the test channel through a key positioned on the panel of the switch matrix 4; the remote control function is used for controlling a switching test channel of the switch matrix 4 by sending an instruction through the upper computer 1; the test channel can be switched by clicking an interface button. The switch matrix 4 is provided with high-power switches for all channels, and the withstand power is more than 10W; one end of each channel switch is connected with the power distribution network, the other end of each channel switch is connected with a high-power load, and the high-power load is provided with a heat dissipation device.
The output port of the switch matrix 4 is connected to the radio frequency port of the mixer 3 by a radio frequency cable, and the intermediate frequency output port of the mixer 3 is connected to a No. 61 oscilloscope or other test ports by an oscilloscope 6 probe or an SMA/BNC conversion line.
The upper computer 1 and the product 7 to be detected are connected through an R422 interface, and if the upper computer 1 does not have an RS422 port, the upper computer can be switched through by a USB-to-RS 422 adapter. In addition, the TX + or TX-line of the RS422 interface needs to be led out separately to be used as a test trigger signal to be connected to the signal or other test ports of the oscilloscope 62.
The upper computer 1 is connected with the signal source 5, the oscilloscope 6 and the switch matrix 4 by adopting a network interface or a GPIB interface.
The power divider 2 can be any one of various general one-to-two radio frequency power dividers 2, and the working frequency range of the power divider 2 needs to cover the test frequency; the mixer 3 only needs to select the passive mixer 3, and the working frequency range of the mixer 3 needs to cover the test frequency; the switch matrix 4 is used for multi-channel repeated test of the phased array, and the repeated and long-time-consuming work of manually replacing a test channel cable during repeated test is reduced, if the number of channels is small and the requirement of saving cost exists, the requirement of making a force can be avoided.
The upper computer 1 is used for configuring the working mode, the beam pointing parameter and the instruction execution time of the product 7 to be tested, and sending the parameter information to the product 7 to be tested according to a communication protocol; acquiring the telemetering parameters of the product 7 to be detected; controlling the switch matrix 4 to switch to the corresponding test channel; configuring the state parameters of the signal source 5 and the oscilloscope 6;
the power divider 2 is used for dividing the test signal into two parts, inputting the test signal into the product to be tested 7 and the frequency mixer 3 as a test input signal and a frequency mixing local oscillator signal;
the mixer 3 is used for mixing the output signal of the product 7 to be tested with the test input signal to generate a zero-frequency signal for testing; the phase change of the output signal of the product 7 to be measured is converted into the time domain amplitude change which can be measured by the oscilloscope 6 through the frequency mixer 3.
The switch matrix 4 is used for switching the test path to a corresponding channel of the product 7 to be tested according to the instruction of the upper computer 1;
the signal source 5 is used for generating a dot frequency signal required by testing;
the oscilloscope 6 is used for capturing amplitude change of the zero-frequency signal; collecting data sent by a port of an upper computer 1;
the product 7 to be tested works in different working modes according to different instructions; and receiving the beam pointing parameters and the instruction execution time through the upper computer 1, and changing the channel phase shift quantity according to the pointing parameters and the instruction execution time.
The upper computer 1 comprises test software for controlling the test instrument, the matrix and the switch matrix 4, and can be used for configuring relevant parameters of the test instrument, the switch matrix 4 and a product 7 to be tested; the remote sensing state data of the product 7 to be tested can also be acquired; the method can also be used for collecting test data generated by a test instrument and calculating a test result. The testing software can be developed by C language, a point-to-point communication transmission protocol is adopted between the upper computer 1 and the product 7 to be tested, a 4-wire full duplex RS422 interface and an asynchronous communication mode are adopted, and the upper computer 1 carries out remote control and remote measurement on the product 7 to be tested; the upper computer 1, the switch matrix 4 and the test instrument pass through a user datagram protocol, the upper computer 1 can set instrument and matrix parameters, test data are obtained, and a test result is calculated.
The host computer 1 include: the device comprises an analog data sending module, a telemetry module, an instrument parameter configuration module and a test result output module.
And the analog data sending module is used for configuring the working mode, the beam pointing parameter and the instruction execution time of the product 7 to be tested, coding the working mode, the beam pointing parameter and the instruction execution time according to a communication protocol, and sending the coded signals to the product 7 to be tested through the RS422 interface, so that the product 7 to be tested can calculate the phase shifting code according to the beam control instruction.
And the remote measuring module receives the working state indication, the channel phase shift code and the abnormal state indication data which are periodically returned by the product to be tested 7 within 17 seconds through the RS422 interface, decodes the data according to the communication protocol and displays the data on the test interface of the upper computer 1.
The instrument parameter configuration module can set the output signal frequency, the power and the switching state of the signal source 5 and a state parameter file called by the oscilloscope 6 according to the working frequency requirement of the product 7 to be tested; the channel state of the switch matrix 4 can be controlled, and after the current test channel is finished, the current test channel is switched to the rest untested channels one by one to carry out channel-by-channel test; the state parameter file called by the oscilloscope 6 needs to be stored as a state file required by the test after being set according to the debugging state of the used oscilloscope 6 channel and the product 7 to be tested before the test is started.
And the test result output module can be used for reading the measurement data of the oscilloscope 6, including the trigger time and the phase-shifting action completion time, calculating the difference value of the trigger time and the phase-shifting action completion time as the switching time test data record of the current channel, and outputting the most different value as the test result after channel-by-channel repeated tests. Meanwhile, the test results displayed by the oscilloscope 6 during the test of each channel are subjected to screenshot storage and serve as original records for the user to check after the test is finished.
As shown in fig. 2, the method for testing the phased array radio frequency beam pointing switching time provided by the embodiment of the present invention includes the following steps:
step S1, configuring the operating mode of the product 7 to be tested, the test channel of the switch matrix 4, and the state parameters of the test instrument.
Before configuring the parameters, the upper computer 1, the signal source 5, the oscilloscope 6, the switch matrix 4 and the product to be tested 7 can be connected according to the phased array radio frequency beam pointing switching time test system shown in fig. 1.
After the connection of the upper computer 1, the signal source 5, the oscilloscope 6, the switch matrix 4 and the product 7 to be tested is completed, the test software of the upper computer 1 is turned on, the power supplies of the upper computer 1, the signal source 5, the oscilloscope 6, the switch matrix 4 and the product 7 to be tested are turned on, and whether the connection state of the upper computer 1, the signal source 5, the oscilloscope 6 and the switch matrix 4 is normal or not can be checked through a hardware driving module of the upper computer 1.
After the connection state is confirmed to be normal, the instrument parameter configuration module is utilized to set the output frequency, the output power and the switching state of the signal source 5 according to the test parameters of the product 7 to be tested, initialize the switch matrix 4, and set or call the configuration parameters or files of the oscilloscope 6, so as to complete the setting of the relevant instrument equipment to be tested, and ensure the safety of the product 7 to be tested and the instrument equipment.
The working mode of the product 7 to be tested can be configured by using the simulation data sending module of the test software, and whether the working mode setting of the product 7 to be tested is correct or not can be checked through the telemetering module.
Step S2, configure the initial beam pointing angle of the product 7 to be tested.
After the working mode of the product 7 to be measured is set, in the analog data sending module of the test software, the corresponding working mode is used to set the beam pointing angle of the product 7 to be measured as an initial angle, which can be defined as (0 degrees ), or other angles having a certain deviation from the pointing angle for subsequent measurement. When the initial beam pointing angle is sent, the execution interval time information also needs to be filled, and the sufficient time is recommended to be reserved for the testing software to finish the sending of the initial pointing angle.
And step S3, sending the switched beam pointing angle and the switched execution time, and setting single trigger of the oscilloscope 6.
In a simulation data sending module of the test software, filling in an expected beam pointing switching angle and beam switching execution interval time, clicking a start test button, and setting the oscilloscope 6 to be in a single-trigger mode by an instrument parameter configuration module of the test software.
After the test is started, the execution time is calculated by the simulation data sending module of the test software in the test software, and the beam pointing angle and the execution time are sent to the product 7 to be tested.
In step S4, the oscilloscope 6 captures the data transmission start time, measures the phase shift completion time, and calculates the channel beam switching time.
The oscilloscope 6 captures data information sent by an RS422 interface TX +/-pin between the upper computer 1 and a product 7 to be tested to complete triggering, as shown in figure 4, namely the beam pointing data sending start time is recorded as T by a test result output module of the upper computer 11。
The change of the phase of the channel before and after the phase shift of the current test channel in the frequency domain is shown in fig. 3, the channel is subjected to frequency mixing to zero frequency, the channel is converted into the time domain, the amplitude jump of the zero frequency signal is measured by the oscilloscope 6, the jump time is the time for completing the phase shift as shown in fig. 4, and the jump time is recorded as T by the test result output module of the upper computer 12。
From top to bottomThe test result output module of the computer 1 calculates the current channel wave beam switching time as T2-T1And the graphic screenshot on the oscilloscope 6 is saved to the upper computer 1 and named as the name of the current test channel.
And step S5, the worst value is taken as the switching time of the wave beam of the product 7 to be tested, and the test is finished.
And carrying out channel-by-channel test on the product 7 to be tested, recording the switching time of each channel wave beam by a test result output module of the upper computer 1, and storing a test mapping chart. And after all the channels are measured, taking the worst value as the beam switching time of the product 7 to be tested, and completing the test.
The invention adopts the mode of same frequency mixing to mix the radio frequency signals to zero frequency, converts the phase change of the radio frequency signals which are difficult to observe and measure into the amplitude change on the time domain, and can be visually measured by the oscilloscope after the amplitude change is amplified by the stylus of the oscilloscope. The instrument equipment and the test accessories adopted by the test system are conventional equipment and instruments, special test equipment does not need to be designed and manufactured, and the use difficulty and threshold of the test system are reduced. The testing system and the method have the advantages that the measurement of the digital signal of the beam pointing parameter and the measurement of the phase change of the radio frequency signal are unified on the oscilloscope, and the radio frequency beam pointing switching time comprising the beam pointing parameter transmission time, the phase shift code calculation time, the phase shift code sending time and the phase shifter action time is directly obtained by measuring the difference value of the change time of the beam pointing parameter transmission time and the phase shift code calculation time.
The test system adopts common measuring instrument equipment to convert the phase time relationship of the radio frequency signals into an amplitude time relationship; the oscilloscope 6 is used for observing the digital signal and the converted phase transformation signal, so that the use is convenient; universal measuring instrument equipment is used as test equipment, and special test equipment is not needed; by designing a method for combining and measuring three different time quantities, namely digital signal transmission time, pointing angle calculation time and radio frequency beam pointing switching, an original sectional measurement mode is replaced, a test interface does not need to be prefabricated or temporarily modified in the product 7 to be tested, and test precision is improved. The repeated testing of the channel is controlled by the upper computer 1, and the phased array radio frequency wave beam pointing switching time is measured in a wired stage.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A phased array radio frequency beam pointing switch time test system, comprising: the device comprises an upper computer (1), a power divider (2), a frequency mixer (3), a switch matrix (4), a signal source (5), an oscilloscope (6) and a product to be detected (7); the output port of the signal source (5) is connected with the input port of the power divider (2), one path of the output port of the power divider (2) is connected to the input port of the product to be detected (7), and the other path is connected to the mixer (3); the output port of the product to be tested (7) is correspondingly connected with the input port of the switch matrix (4) according to the port serial number, the output port of the switch matrix (4) is connected with the radio frequency port of the mixer (3), and the intermediate frequency output port of the mixer (3) is connected to the port No. 1 of the oscilloscope (6) by adopting an oscilloscope probe or an SMA/BNC conversion line; the upper computer (1) is connected with a product (7) to be tested through an R422 interface, and a TX + or TX-line of the RS422 interface is led out independently and is connected to a No. 2 port of the oscilloscope (6); the upper computer (1) is connected with the signal source (5), the oscilloscope (6) and the switch matrix (4) by adopting a network interface or a GPIB interface; the upper computer (1) is used for configuring the working mode, the beam pointing parameter and the instruction execution time of the product (7) to be tested, sending the parameter information to the product (7) to be tested according to a communication protocol, acquiring the remote measurement parameter of the product (7) to be tested, controlling the switch matrix (4) to be switched to a corresponding test channel, and configuring the state parameters of the signal source (5) and the oscilloscope (6); the power divider (2) is used for dividing the test signal into two parts, inputting the product to be tested (7) and the frequency mixer (3) as a test input signal and a frequency mixing local oscillator signal; the frequency mixer (3) is used for mixing an output signal of a product to be tested (7) with a test input signal to generate a zero-frequency signal for testing; the switch matrix (4) is used for switching the test access to a corresponding channel of a product (7) to be tested according to an instruction of the upper computer (1); the signal source (5) is used for generating a dot frequency signal required by testing; the oscilloscope (6) is used for capturing amplitude change of the zero-frequency signal; collecting data sent by a port of an upper computer (1); the product (7) to be tested works in different working modes according to different instructions; and receiving the beam pointing parameters and the instruction execution time through the upper computer (1), and changing the channel phase shift quantity according to the pointing parameters and the instruction execution time.
2. The phased array radio frequency beam pointing switching time test system according to claim 1, wherein said upper computer (1) comprises: the device comprises an analog data sending module, a remote measuring module, an instrument parameter configuration module and a test result output module;
the analog data sending module is used for configuring the working mode, the beam pointing parameter and the instruction execution time of the product (7) to be tested, coding according to a communication protocol and sending the coded data to the product (7) to be tested;
the remote measuring module is used for receiving the working state indication, the channel phase shift code and the abnormal state indication data returned by the product (7) to be measured, decoding according to a communication protocol and displaying on a test interface of the upper computer (1);
the instrument parameter configuration module is used for configuring the output signal frequency and power of the signal source (5), configuring a state parameter file called by the oscilloscope (6), and controlling the switch matrix (4) to be switched to a test channel corresponding to the product to be tested (7) according to the test requirement to carry out channel-by-channel test;
and the test result output module is used for reading the test data of the oscilloscope (6), calculating the test data and outputting the test result.
3. The phased array radio frequency beam pointing switching time test system according to claim 1, wherein the power divider (2) is a general one-to-two radio frequency power divider.
4. A phased array rf beam pointing switching time test system according to claim 3, characterized in that the mixer (3) is a passive mixer (3).
5. The phased array radio frequency beam pointing switching time test system according to claim 4, wherein the operating frequency ranges of the power divider (2) and the mixer (3) cover the test frequency of the product (7) to be tested.
6. The phased array radio frequency beam pointing switching time test system according to claim 1, wherein the switch matrix (4) has a local control function and a remote control function, a tester manually switches a test channel in a local control state, and an upper computer (1) switches the test channel by channel in a remote control state.
7. A test method applied to the phased array radio frequency beam pointing switching time test system of any one of claims 1 to 6, characterized by comprising the following steps:
a signal source (5) generates a radio frequency signal of the working frequency of the product (7) to be tested, the radio frequency signal is divided into two parts by a power divider (2), one part is used as the local oscillation signal, and the other part is used as a test input signal;
mixing the radio frequency signal output by the product (7) to be tested with the same frequency signal of the local oscillation signal and inputting the mixed frequency signal into the frequency mixer (3) so as to obtain a zero frequency signal;
detecting an RS422 data sending port signal of the upper computer (1) as a test trigger signal source, namely a beam switching start time mark, by using an oscilloscope (6);
the completion of amplitude jump of the zero-frequency signal is detected by an oscilloscope (6) and is used as the test ending time, namely a phase-shifting action completion mark;
measuring the time interval from the beginning of the first frame signal jump to the completion of the zero-frequency signal amplitude jump by an RS422 data port through an oscilloscope (6) to obtain the test result of the beam switching time of the current channel;
the upper computer (1) controls the switch matrix (4) and the product (7) to be tested, the testing is repeatedly carried out channel by channel, and the worst value is taken as the testing result of the beam switching time and recorded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111349758.2A CN114070425B (en) | 2021-11-15 | 2021-11-15 | Phased array radio frequency beam pointing switching time testing system and method |
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