CN116298554A - Antenna multi-frequency-point directional diagram testing system and method in external field environment - Google Patents
Antenna multi-frequency-point directional diagram testing system and method in external field environment Download PDFInfo
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Abstract
The invention discloses an antenna multi-frequency point pattern test system and a test method in an outfield environment, wherein the test system comprises a vector network analyzer, a turntable, a main control computer, a signal source and a standard transmitting antenna; the vector network analyzer, the turntable and the main control computer are arranged at the near end, and the signal source and the standard transmitting antenna are arranged at the far end; the turntable is provided with an antenna to be tested, and the antenna to be tested is connected with the vector network analyzer; the output end of the vector network analyzer is connected with the input end of the signal source, and the output end of the signal source is connected with the standard transmitting antenna; the vector network analyzer is also connected with a main control computer through a network cable; further comprises: the system comprises a first optical fiber branch and a second optical fiber branch, wherein the main control computer is connected with a signal source through the first optical fiber branch, and the output end of the vector network analyzer is connected with the signal source through the second optical fiber branch. The method solves the problems that the self-receiving of the vector network analyzer cannot be utilized under the external field environment, and the receiving and transmitting synchronization of the multi-frequency-point directional diagram is required to be rapidly tested, and realizes the simultaneous testing of the multi frequency points.
Description
Technical Field
The invention relates to the technical field of antenna testing, in particular to an antenna multi-frequency-point directional diagram testing system and method in an external field environment.
Background
The antenna pattern (mainly refers to the amplitude and phase pattern received by an antenna) test is mainly carried out by radiating signals through a far-end signal source, installing a tested antenna on a turntable for rotation, and collecting the antenna receiving signals at different angles through a vector network analyzer (vector network for short) to form an angle-amplitude or angle-phase pattern. In general, only single-frequency directional diagram data can be measured by rotating one circle, the multi-frequency directional diagram test efficiency is low, and if the directional diagram of a plurality of frequency points is scanned once, the problems of synchronous angular speed of a turntable, synchronous signal source transmitting frequency and receiving frequency of a vector network analyzer and the like are required to be concerned. For pattern testing of a wide-band antenna and a multi-channel phased array antenna, the same scanning of multiple frequency points is particularly important to improving testing efficiency and releasing testing environment resources.
Currently, there are two modes for pattern testing of multiple frequency points of an antenna: the first method is to scan one frequency point at a time, and obtain the pattern data of a plurality of frequency points by changing the frequency point scanning for a plurality of times. The second method is that the output signal of the output end of the vector network analyzer reaches the antenna after space radiation, the antenna receives the signal and then is connected to the receiving end of the vector network analyzer in a wired mode, the rotation of the rotary table is controlled, the vector network analyzer starts scanning, the scanning is switched to different frequencies once, and the rotary table can obtain the pattern data of a plurality of frequency points after rotating for one circle.
However, the first method needs to scan a large number of circles to obtain a large number of frequency points, so that the manpower and material resources are consumed, and the testing efficiency is low. The second mode adopts the source emission of vector network analyzer self to carry out signal receiving collection after the antenna, this kind of application environment is limited, can satisfy the test requirement through the short distance between vector network analyzer's transmitting end and the antenna that is surveyed in darkroom environment, and if in the external field environment, vector network analyzer places at the receiving terminal, connects standard transmitting antenna through the radio frequency cable, and places standard transmitting antenna and carries out signal radiation at the distal end, then receives through vector network analyzer, and the signal is great in radio frequency cable and free space loss, leads to vector network analyzer received signal less, and signal jitter is big, can't satisfy the test requirement.
Disclosure of Invention
The invention aims to solve the technical problems that the conventional antenna pattern test is mainly aimed at the test of single frequency points, the number of circles of frequency points to be scanned is obtained, the consumption of manpower and material resources is high, and the test efficiency is low; in addition, the self-receiving of the vector network analyzer cannot be utilized in the external field environment, and the multi-frequency point directional diagram receiving and transmitting synchronization problem is rapidly detected. The invention aims to provide a system and a method for testing multiple frequency point directional patterns of an antenna in an external field environment, which are characterized in that a vector network analyzer at a receiving end outputs a trigger signal according to a frequency scanning list, the trigger signal is triggered by an optical fiber and a photoelectric conversion device and a remote signal source for transmitting signals to realize frequency accurate synchronous scanning, meanwhile, the angle of a turntable is accurately controlled to realize the purpose that the turntable rotates for scanning multiple frequency point directional patterns for one circle, and the testing efficiency of the antenna in the external field test environment is improved. The invention solves the technical problems that the self-receiving of the vector network analyzer cannot be utilized under the external field environment and the synchronous receiving and transmitting of the multi-frequency point directional diagram is required to be rapidly tested, realizes the multi-frequency point simultaneous testing function, and realizes higher testing speed and automation; meanwhile, a new idea is provided for rapid test of the directional diagram in the external field environment of the wide-band antenna.
The invention is realized by the following technical scheme:
in a first aspect, the invention provides a system for testing an antenna multi-frequency point pattern in an external field environment, wherein the system comprises a vector network analyzer, a turntable, a main control computer, a signal source and a standard transmitting antenna; the vector network analyzer, the turntable and the main control computer are arranged at the near end in the external field environment, and the signal source and the standard transmitting antenna are arranged at the far end in the external field environment; the turntable is provided with an antenna to be tested, and the antenna to be tested is connected with the vector network analyzer; the output end of the vector network analyzer is connected with the input end of the signal source, and the output end of the signal source is connected with the standard transmitting antenna; the radio frequency signal is spatially radiated by a transmitting antenna; the vector network analyzer is also connected with a main control computer through a network cable;
further comprises: the system comprises a first optical fiber branch and a second optical fiber branch, wherein a main control computer is connected with a signal source through the first optical fiber branch, and the output end of a vector network analyzer is connected with the signal source through the second optical fiber branch;
the first optical fiber branch is used for remotely controlling a far-end signal source, two ends of the first optical fiber branch are respectively provided with an optical fiber transceiver, and the far-end signal source and a near-end main control computer are connected to the optical fiber transceivers through network cables to realize remote network communication;
and the second optical fiber branch is used for triggering signals, and photoelectric converters are respectively arranged at two ends of the second optical fiber branch to realize conversion of electric signals and optical signals output by the vector network analyzer.
Further, the system also comprises a standard reference antenna, wherein the standard reference antenna is arranged at the near end in an external field environment and is connected with the vector network analyzer;
the standard reference antenna is used for synchronously receiving the radio frequency signals radiated by the signal source with the antenna to be tested, and inputting the standard reference signals into the vector network analyzer for the vector network analyzer to test the antenna pattern by adopting a ratio mode.
Further, the first optical fiber branch comprises a first optical fiber transceiver, a first optical fiber and a second optical fiber transceiver, the main control computer is connected with the first optical fiber transceiver through a network cable, the first optical fiber transceiver is connected with the second optical fiber transceiver through the first optical fiber, and the second optical fiber transceiver is connected with a signal source through the network cable;
the second optical fiber branch comprises a first photoelectric converter, a second optical fiber and a second photoelectric converter, the output end of the vector network analyzer is connected with the first photoelectric converter through a radio frequency cable, the first photoelectric converter is connected with the second photoelectric converter through the second optical fiber, and the second photoelectric converter is connected with a signal source through the radio frequency cable.
Further, the first fiber optic transceiver is disposed at the proximal end and the second fiber optic transceiver is disposed at the distal end;
the first photoelectric converter is arranged at the vector network analyzer end at the near end, and the second photoelectric converter is arranged at the signal source end at the far end.
Further, the vector network analyzer is in full receiver mode and supports parallel operation of the multi-channel receiver.
In a second aspect, the present invention further provides a method for testing an antenna multi-frequency-point pattern in an external field environment, where the method is applied to the system for testing an antenna multi-frequency-point pattern in an external field environment, so as to implement an antenna multi-frequency-point pattern in an external field environment; the test method comprises the following steps:
step 1, performing environment deployment and parameter configuration on the antenna multi-frequency point pattern test system under the external field environment;
step 2, a vector network analyzer is started to scan by sending a control instruction through a main control computer, the vector network analyzer outputs a trigger pulse signal, and the trigger pulse signal is subjected to electro-optic and photoelectric signal conversion through a first photoelectric converter, a first optical fiber and a second photoelectric converter and then is sent to a signal source;
step 3, the signal source sequentially starts to output radio frequency signals at the current frequency according to the received trigger pulse signals and the test frequency list, and the radio frequency signals are subjected to space radiation through a standard transmitting antenna; meanwhile, the antenna to be tested rotates along with the turntable, after one-time scanning is completed through the vector network analyzer, the automatic testing software of the main control computer acquires the amplitude and the phase of the signal received by the vector network analyzer, and matches the angle of the current turntable to form angle-amplitude/angle-phase pattern data under the current frequency, namely, the data acquisition of one frequency point is completed;
and 4, switching to the next frequency point according to the test frequency list after one scanning is completed by the vector network analyzer, repeating the step 2 and the step 3, switching the working frequency according to the test frequency list after the signal source receives the trigger signal, and the like until the turntable rotates for one circle, so that the antenna pattern data of a plurality of frequency points can be obtained.
Further, the step 1 specifically includes the following sub-steps:
step 11, performing environment deployment on the antenna multi-frequency point pattern test system under the external field environment;
step 12, powering up each device of the system, and performing linkage control on the turntable, the vector network analyzer and the signal source by running automatic test software on the main control computer after the self-checking is normal;
and 13, carrying out parameter configuration on the vector network analyzer and the signal source.
Further, in step 13, parameter configuration is performed on the vector network analyzer and the signal source, including:
configuring the same test frequency list in the vector network analyzer and the signal source through automatic test software on a main control computer;
configuring a frequency scanning range for the vector network analyzer, and comparing test modes by the multichannel receiver, wherein the frequency scanning range is consistent with the frequency of a test frequency list set by a signal source;
configuring frequency residence time, frequency points to be scanned and a trigger working mode for a signal source, wherein the trigger working mode is an external trigger working mode;
the turntable is provided with a rotation speed.
Further, in step 3, a scan is completed by the vector network analyzer, including:
the vector network analyzer synchronously receives irradiation signals of the standard reference antenna and the antenna to be tested, and performs antenna pattern test by adopting a ratio method; the ratio method is based on a multi-channel receiver ratio mode of a vector network analyzer for testing.
Further, the test method can realize the simultaneous test of the patterns of a plurality of antennas or a plurality of units of the phased array antenna.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to an antenna multi-frequency point pattern test system and a test method under an external field environment, wherein the external trigger test frequency list scanning function of a signal source and the test frequency list scanning function of a vector network analyzer are utilized to connect the trigger output of the vector network analyzer and the trigger input of the signal source through optical fiber photoelectric conversion to realize high-precision synchronization of frequency conversion under the external field environment (non-darkroom environment); the remote control of the remote signal source is realized by utilizing optical communication, a user configures a scanning frequency list and frequency residence time at an antenna test end (namely a near end) through automatic test software of an operation main control computer, after the configuration is finished, the automatic test software of the main control computer automatically loads the frequency list into the signal source and a vector network analyzer, and in the rotating process of a turntable, automatic frequency switching, turntable angle acquisition and automatic matching of amplitude/phase value acquisition of antenna receiving signals are realized through the automatic test software, and the antenna pattern data of a plurality of frequency points can be obtained after the turntable rotates for one circle. The invention solves the technical problems that the self-receiving of the vector network analyzer cannot be utilized under the external field environment and the synchronous receiving and transmitting of the multi-frequency point directional diagram is required to be rapidly tested, realizes the multi-frequency point simultaneous testing function, and realizes higher testing speed and automation; meanwhile, a new idea is provided for rapid test of the directional diagram in the external field environment of the wide-band antenna.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an antenna multi-frequency point pattern testing system in an external field environment according to the present invention.
Detailed Description
Hereinafter, the terms "comprises" or "comprising" as may be used in various embodiments of the present invention indicate the presence of inventive functions, operations or elements, and are not limiting of the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the invention, the terms "comprises," "comprising," and their cognate terms are intended to refer to a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be interpreted as first excluding the existence of or increasing likelihood of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B or may include both a and B.
Expressions (such as "first", "second", etc.) used in the various embodiments of the invention may modify various constituent elements in the various embodiments, but the respective constituent elements may not be limited. For example, the above description does not limit the order and/or importance of the elements. The above description is only intended to distinguish one element from another element. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described to "connect" one component element to another component element, a first component element may be directly connected to a second component element, and a third component element may be "connected" between the first and second component elements. Conversely, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular is intended to include the plural as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the invention belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in connection with the various embodiments of the invention.
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Based on the existing antenna pattern test, the single frequency point is tested mostly, the number of circles of frequency points are required to be scanned when the number of frequency points is obtained, the manpower and material resources consumption is high, and the test efficiency is low; in addition, the self-receiving of the vector network analyzer cannot be utilized in the external field environment, and the multi-frequency point directional diagram receiving and transmitting synchronization problem is rapidly detected. The invention designs an antenna multi-frequency point pattern test system and a test method under an external field environment, wherein the invention utilizes a signal source external trigger test frequency list scanning function and a vector network analyzer test frequency list scanning function to connect a vector network analyzer trigger output and a signal source trigger input through optical fiber photoelectric conversion to realize high-precision synchronization of frequency conversion, and utilizes optical communication to realize remote control of a far-end signal source.
The invention solves the technical problems that the self-receiving of the vector network analyzer cannot be utilized under the external field environment and the synchronous receiving and transmitting of the multi-frequency point directional diagram is required to be rapidly tested, realizes the multi-frequency point simultaneous testing function, and realizes higher testing speed and automation; meanwhile, a new idea is provided for rapid test of the directional diagram in the external field environment of the wide-band antenna.
Example 1
As shown in FIG. 1, in the system for testing the antenna multi-frequency point directional diagram in the outfield environment, communication is carried out between a main control computer and a switch, between the switch and a vector network analyzer, between the switch and a first optical fiber transceiver, and between a signal source and a second optical fiber transceiver in FIG. 1 through a Local Area Network (LAN). The test system comprises a vector network analyzer, a turntable, a main control computer, a signal source and a standard transmitting antenna; the vector network analyzer, the turntable and the main control computer are arranged at the near end in the external field environment, and the signal source and the standard transmitting antenna are arranged at the far end in the external field environment; the turntable is provided with an antenna to be tested, and the antenna to be tested is connected with the vector network analyzer; the output end of the vector network analyzer is connected with the input end of the signal source, and the output end of the signal source is connected with the standard transmitting antenna; the radio frequency signal is spatially radiated by a transmitting antenna; the vector network analyzer is also connected with a main control computer through a network cable;
further comprises: the system comprises a first optical fiber branch and a second optical fiber branch, wherein a main control computer is connected with a signal source through the first optical fiber branch, and the output end of a vector network analyzer is connected with the signal source through the second optical fiber branch;
the first optical fiber branch is used for remotely controlling a far-end signal source, two ends of the first optical fiber branch are respectively provided with an optical fiber transceiver, and the far-end signal source and a near-end main control computer are connected to the optical fiber transceivers through network cables to realize remote network communication;
the second optical fiber branch is used for triggering signals, and photoelectric converters are respectively arranged at two ends of the second optical fiber branch to realize conversion of electric signals and optical signals output by the vector network analyzer;
specifically, the first optical fiber branch comprises a first optical fiber transceiver, a first optical fiber and a second optical fiber transceiver, the main control computer is connected with the first optical fiber transceiver through a network cable, the first optical fiber transceiver is connected with the second optical fiber transceiver through the first optical fiber, and the second optical fiber transceiver is connected with a signal source through the network cable; the second optical fiber branch comprises a first photoelectric converter, a second optical fiber and a second photoelectric converter, the output end of the vector network analyzer is connected with the first photoelectric converter through a radio frequency cable, the first photoelectric converter is connected with the second photoelectric converter through the second optical fiber, and the second photoelectric converter is connected with a signal source through the radio frequency cable.
Specifically, the first optical fiber transceiver is disposed at the proximal end, and the second optical fiber transceiver is disposed at the distal end; the first photoelectric converter is arranged at the vector network analyzer end at the near end, and the second photoelectric converter is arranged at the signal source end at the far end.
According to the technical scheme, the two paths of optical fiber branches are adopted, so that the signals of the near end and the far end in the external field environment are quickly and accurately synchronized, and the influence of the distance is small.
Further comprises: the standard reference antenna is arranged at the near end of the external field environment and is connected with the vector network analyzer;
the standard reference antenna is used for synchronously receiving the radio frequency signals radiated by the signal source with the antenna to be tested, and inputting the standard reference signals into the vector network analyzer for the vector network analyzer to test the antenna pattern by adopting a ratio mode;
according to the technical scheme, in order to solve the problem that the weak signal received by the antenna end to be tested through the vector network analyzer is inaccurate in measurement in the external field remote environment, the antenna pattern test is carried out by adopting a ratio method, namely, the standard reference antenna serving as a reference is fixed at the antenna end to be tested in a mode of adding the standard reference antenna for comparison, the signal is synchronously received with the antenna to be tested, then the test is carried out through a multi-channel receiver ratio mode of the vector network analyzer, instead of acquiring the absolute signal value received by the antenna end of the tested, and the problem that the vector network analyzer is difficult to acquire when the signal received by the antenna end of the external field environment is weak is solved.
In addition, the main control computer is used for running automatic test software of the pattern and sending out a control instruction to start the vector network analyzer to scan; the turntable is used for installing an antenna to be tested, and the antenna to be tested is connected with the vector network analyzer, and specifically, the antenna to be tested is installed in the center of the turntable after being provided with a test fixture (bracket); the vector network analyzer is in full receiver mode and supports parallel operation of the multi-channel receiver.
The test flow of the system is as follows: firstly, a vector network analyzer is started to scan by sending a control instruction through a main control computer, the vector network analyzer outputs a trigger pulse signal, and the trigger pulse signal is subjected to electro-optical and photoelectric signal conversion through a first photoelectric converter, a first optical fiber and a second photoelectric converter and then is sent to a signal source; secondly, the signal source sequentially starts to output radio frequency signals at the current frequency according to the received trigger pulse signals and the test frequency list, and the radio frequency signals are subjected to space radiation through a standard transmitting antenna; meanwhile, the antenna to be tested rotates along with the turntable, after one-time scanning is completed through the vector network analyzer, the automatic testing software of the main control computer acquires the amplitude and the phase of the signal received by the vector network analyzer, and matches the angle of the current turntable to form angle-amplitude/angle-phase pattern data under the current frequency, namely, the data acquisition of one frequency point is completed; and finally, switching to the next frequency point according to the test frequency list after the vector network analyzer finishes one scanning, repeating the above flow, switching the working frequency according to the test frequency list after the signal source receives the trigger signal by outputting the trigger signal, and the like until the turntable rotates for one circle, and obtaining the antenna pattern data of a plurality of frequency points.
The testing system designed by the invention realizes the simultaneous testing of a plurality of frequency points and a plurality of array elements of the phased multi-array element antenna by the vector network analyzer, and greatly improves the testing objects and the testing efficiency.
Example 2
As shown in fig. 1, the difference between the present embodiment and embodiment 1 is that the present embodiment provides a method for testing an antenna multi-frequency-point pattern in an external field environment, and the method is applied to a system for testing an antenna multi-frequency-point pattern in an external field environment of embodiment 1, so as to implement an antenna multi-frequency-point pattern in an external field environment; the test method comprises the following steps:
step 1, performing environment deployment and parameter configuration on the antenna multi-frequency point pattern test system under the external field environment; step 1 specifically comprises the following substeps:
step 11, performing environment deployment on the antenna multi-frequency point pattern test system under the external field environment;
(a) According to the basic structure of the pattern test, a basic test environment is deployed, an antenna to be tested is provided with a test clamp (i.e. a bracket) and then is arranged in the center of a turntable, and a connector port of the antenna to be tested is connected with a receiver port of a vector network analyzer through a radio frequency cable. And calculating the remote position according to a far-field test distance formula according to the working frequency of the antenna and the size of the antenna, and deploying a signal source and a standard radiation antenna (namely a standard transmitting antenna) to the remote.
(b) Deploying two paths of optical fiber branches: the first optical fiber branch is used for remotely controlling a far-end signal source, two ends of the first optical fiber branch are respectively provided with an optical fiber transceiver, and the far-end signal source and a near-end main control computer are connected to the optical fiber transceivers through network cables to realize remote network communication;
the second optical fiber branch is used for triggering signals, and photoelectric converters are respectively arranged at two ends of the second optical fiber branch to realize conversion of electric signals and optical signals output by the vector network analyzer; see in particular example 1.
The transmission time of the optical fiber is ns-level, and the transmission time can be ignored in the test of the directional diagram, so that the synchronous scanning of the receiving and transmitting frequencies of the far end and the near end is realized.
Step 12, after the environment deployment is finished, powering up all the equipment of the system, and after the self-checking is normal, performing linkage control on the turntable, the vector network analyzer and the signal source by running automatic test software on a main control computer;
step 13, parameter configuration is carried out on the vector network analyzer and the signal source, and the method comprises the following steps:
configuring the same test frequency list in the vector network analyzer and the signal source through automatic test software on a main control computer;
configuring a frequency scanning range for the vector network analyzer, and comparing test modes by the multichannel receiver, wherein the frequency scanning range is consistent with the frequency of a test frequency list set by a signal source;
configuring frequency residence time, frequency points to be scanned and a trigger working mode for a signal source, wherein the trigger working mode is an external trigger working mode; the residence time of the test frequency list is set to be 20ms, and the frequency points are set to be 11 according to the time calculation of scanning 11 frequency points by the vector network analyzer.
The turntable was configured with a rotational speed of 0.00625 DEG/s.
Step 2, starting a test, starting a vector network analyzer to scan by sending a control instruction through a main control computer, outputting a trigger pulse signal by the vector network analyzer, performing electro-optic and photoelectric signal conversion on the trigger pulse signal through a first photoelectric converter, a first optical fiber and a second photoelectric converter, and then sending the trigger pulse signal to a signal source;
step 3, the signal source sequentially starts to output radio frequency signals at the current frequency according to the received trigger pulse signals and the test frequency list, and the radio frequency signals are subjected to space radiation through a standard transmitting antenna; meanwhile, the antenna to be tested rotates along with the turntable, after one-time scanning is completed through the vector network analyzer, the automatic testing software of the main control computer acquires the amplitude and the phase of the signal received by the vector network analyzer, and matches the angle of the current turntable to form angle-amplitude/angle-phase pattern data under the current frequency, namely, the data acquisition of one frequency point is completed; wherein, accomplish a scanning through vector network analyzer, include:
the vector network analyzer synchronously receives irradiation signals of the standard reference antenna and the antenna to be tested, and performs antenna pattern test by adopting a ratio method; the ratio method is based on a multi-channel receiver ratio mode of a vector network analyzer for testing.
Specifically, the ratio method is to set the vector network analyzer as a multi-channel receiver mode, and can directly set and select the ratio of a certain channel to any other channel, and only configuration is needed; after the configuration is finished, the track data of the scanning curve of the vector network analyzer is obtained through software, and the track data is the data of the tested antenna unit.
And 4, switching to the next frequency point according to the test frequency list after one scanning is completed by the vector network analyzer, repeating the step 2 and the step 3, switching the working frequency according to the test frequency list after the signal source receives the trigger signal, and the like until the turntable rotates for one circle, so that the antenna pattern data of a plurality of frequency points can be obtained.
The automatic test software in the main control computer controls the program to be automatically executed, when the turntable rotates to an end angle according to the set start angle, the automatic test software automatically acquires antenna pattern data of all lists in the frequency list according to frequency classification, and if the vector network analyzer supports the parallel operation of the multichannel receiver, the simultaneous test of patterns of a plurality of antennas or a plurality of units of the phased array antenna can be realized on the basis, and the test efficiency can be greatly improved.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The system for testing the antenna multi-frequency point directional diagram in the external field environment is characterized by comprising a vector network analyzer, a turntable, a main control computer, a signal source and a standard transmitting antenna; the vector network analyzer, the turntable and the main control computer are arranged at the near end in the external field environment, and the signal source and the standard transmitting antenna are arranged at the far end in the external field environment; the turntable is provided with an antenna to be tested, and the antenna to be tested is connected with the vector network analyzer; the output end of the vector network analyzer is connected with the input end of the signal source, and the output end of the signal source is connected with the standard transmitting antenna; the vector network analyzer is also connected with a main control computer through a network cable;
further comprises: the system comprises a first optical fiber branch and a second optical fiber branch, wherein a main control computer is connected with a signal source through the first optical fiber branch, and the output end of a vector network analyzer is connected with the signal source through the second optical fiber branch;
the first optical fiber branch is used for remotely controlling a far-end signal source, two ends of the first optical fiber branch are respectively provided with an optical fiber transceiver, and the far-end signal source and a near-end main control computer are connected to the optical fiber transceivers through network cables to realize remote network communication;
and the second optical fiber branch is used for triggering signals, and photoelectric converters are respectively arranged at two ends of the second optical fiber branch to realize conversion of electric signals and optical signals output by the vector network analyzer.
2. The system for testing the multi-frequency point pattern of the antenna in the external field environment according to claim 1, further comprising a standard reference antenna, wherein the standard reference antenna is arranged at the near end in the external field environment and is connected with a vector network analyzer;
the standard reference antenna is used for synchronously receiving the radio frequency signals radiated by the signal source with the antenna to be tested, and carrying out standard reference input to the vector network analyzer for the vector network analyzer to carry out antenna pattern test by adopting a ratio mode.
3. The system for testing the multi-frequency point pattern of the antenna in the external field environment according to claim 1, wherein the first optical fiber branch comprises a first optical fiber transceiver, a first optical fiber and a second optical fiber transceiver, the main control computer is connected with the first optical fiber transceiver through a network cable, the first optical fiber transceiver is connected with the second optical fiber transceiver through the first optical fiber, and the second optical fiber transceiver is connected with a signal source through the network cable;
the second optical fiber branch comprises a first photoelectric converter, a second optical fiber and a second photoelectric converter, the output end of the vector network analyzer is connected with the first photoelectric converter through a radio frequency cable, the first photoelectric converter is connected with the second photoelectric converter through the second optical fiber, and the second photoelectric converter is connected with a signal source through the radio frequency cable.
4. The system of claim 3, wherein the first fiber optic transceiver is disposed at a proximal end and the second fiber optic transceiver is disposed at a distal end;
the first photoelectric converter is arranged at the near end, and the second photoelectric converter is arranged at the far end.
5. The system for testing the multi-frequency point pattern of the antenna in the external field environment according to claim 1, wherein the vector network analyzer is in a full receiver mode and supports parallel operation of the multi-channel receiver.
6. The method for testing the antenna multi-frequency-point directional diagram in the external field environment is characterized in that the method is applied to the antenna multi-frequency-point directional diagram testing system in the external field environment according to any one of claims 1 to 5, and the antenna multi-frequency-point directional diagram in the external field environment is realized; the test method comprises the following steps:
step 1, performing environment deployment and parameter configuration on the antenna multi-frequency point pattern test system in the outfield environment;
step 2, a vector network analyzer is started to scan by sending a control instruction through a main control computer, the vector network analyzer outputs a trigger pulse signal, and the trigger pulse signal is subjected to electro-optic and photoelectric signal conversion through a first photoelectric converter, a first optical fiber and a second photoelectric converter and then is sent to a signal source;
step 3, the signal source sequentially starts to output radio frequency signals at the current frequency according to the received trigger pulse signals and the test frequency list, and the radio frequency signals are subjected to space radiation through a standard transmitting antenna; meanwhile, the antenna to be tested rotates along with the turntable, after one-time scanning is completed through the vector network analyzer, the main control computer acquires the amplitude and the phase of the signal received by the vector network analyzer, and matches the angle of the current turntable to form angle-amplitude/angle-phase pattern data under the current frequency, namely, the data acquisition of one frequency point is completed;
and 4, switching to the next frequency point according to the test frequency list after the vector network analyzer finishes one scanning, and repeating the step 2 and the step 3 until the turntable rotates for one circle to obtain antenna pattern data of a plurality of frequency points.
7. The method for testing the antenna multi-frequency point pattern in the external field environment according to claim 6, wherein the step 1 specifically comprises the following sub-steps:
step 11, performing environment deployment on the antenna multi-frequency point pattern test system in the external field environment;
step 12, powering up each device of the system, and carrying out linkage control on the turntable, the vector network analyzer and the signal source by operating the main control computer after the self-checking is normal;
and 13, carrying out parameter configuration on the vector network analyzer and the signal source.
8. The method for testing the multi-frequency point pattern of the antenna in the external field environment according to claim 7, wherein the step 13 of performing parameter configuration on the vector network analyzer and the signal source comprises the steps of:
configuring the same test frequency list in the vector network analyzer and the signal source through automatic test software on a main control computer;
configuring a frequency scanning range for the vector network analyzer and comparing test modes of the multichannel receiver, wherein the frequency scanning range is consistent with the frequency of a test frequency list set by a signal source;
configuring frequency residence time, frequency points to be scanned and a trigger working mode for a signal source, wherein the trigger working mode is an external trigger working mode;
the turntable is provided with a rotation speed.
9. The method for testing the multi-frequency point pattern of the antenna in the external field environment according to claim 6, wherein the step 3 of completing one scan through the vector network analyzer comprises the steps of:
the vector network analyzer synchronously receives irradiation signals of the standard reference antenna and the antenna to be tested, and performs antenna pattern test by adopting a ratio method; the ratio method is based on a multi-channel receiver ratio mode of a vector network analyzer for testing.
10. The method for testing the patterns of the multiple frequency points of the antenna in the external field environment according to claim 6, wherein the method can realize the simultaneous testing of the patterns of multiple antennas or multiple units of the phased array antenna.
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