CN116559753A - Automatic calibration system and method for amplitude-phase characteristics of plane waves in static region of compact range - Google Patents
Automatic calibration system and method for amplitude-phase characteristics of plane waves in static region of compact range Download PDFInfo
- Publication number
- CN116559753A CN116559753A CN202310665915.3A CN202310665915A CN116559753A CN 116559753 A CN116559753 A CN 116559753A CN 202310665915 A CN202310665915 A CN 202310665915A CN 116559753 A CN116559753 A CN 116559753A
- Authority
- CN
- China
- Prior art keywords
- amplitude
- phase
- scanning
- compact
- calibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003068 static effect Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012360 testing method Methods 0.000 claims abstract description 62
- 238000005388 cross polarization Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 239000000523 sample Substances 0.000 claims abstract description 15
- 230000010287 polarization Effects 0.000 claims description 23
- 230000036544 posture Effects 0.000 claims description 23
- 238000004364 calculation method Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 9
- 230000033001 locomotion Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000007405 data analysis Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 230000033772 system development Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003012 network analysis Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses an automatic calibration system and method for amplitude-phase characteristics of plane waves in a dead zone of a compact range, wherein the system comprises the following components: a microwave amplitude-phase unit, a scanning equipment unit and a central control unit; the microwave amplitude-phase unit is used for receiving signals and measuring the amplitude and the phase of the signals; a scanning device unit for controlling the receiving position and posture of the detection probe; and the central control unit is used for remotely controlling the microwave amplitude-phase unit and the scanning equipment unit, analyzing amplitude and phase data in real time and automatically calculating the characteristics of the dead zone. According to the scanning data, three indexes of the amplitude unevenness of the static field, the phase unevenness of the static field and the cross polarization of the static field are quantized, the performance of the compact field testing system is judged according to the result, and the method has reference significance for the initial inspection and the re-inspection of the compact field.
Description
Technical Field
The invention relates to a calibration method, in particular to an automatic calibration system and method for amplitude-phase characteristics of plane waves in a dead zone of a compact range.
Background
The compact range is a testing means widely applied to high-performance radar antennas, radome characteristic tests and radar target RCS tests, and has the advantages of wide range, high testing precision, convenience in use and the like. Since the 90 s of the 20 th century, companies all over the world have been developing large compact ranges in many different forms. Currently, tens of compact ranges are built in succession in China, the types and the sizes of the compact ranges are different, and the performance difference of the static regions of the compact ranges is large. At present, performance inspection is carried out on the static region performance of the compact field by a development unit, a compact field user generally has no knowledge about design and adjustment of the compact field, the details of the detection process are not clear, the performance of the compact field can be known only by a detection report of the development party, and the development party generally has different post-processing modes of test data of indexes such as amplitude Ripple, amplitude taper Tapper and the like of the performance index of the static region of the compact field, so that the compact field user may worry about the actual performance of the static region. The compact system is finally provided with a uniform plane wave with very high polarization purity, so three indexes for evaluating the most core of the compact system are as follows: dead zone field amplitude irregularities, dead zone field phase irregularities, and dead zone field cross polarization. The first two indexes show the uniformity of the plane wave, and the latter index shows the polarization purity of the plane wave. In the detection of compact range performance, these three indicators are generally examined.
The invention constructs a large compact range dead zone performance automatic calibration system, which mainly comprises a microwave amplitude-phase system, a scanning equipment system and a central control system, wherein the microwave amplitude-phase system is used for measuring amplitude and phase of a probe receiving signal, the scanning equipment system can be used for controlling the receiving position and the gesture of a detection probe, the central control system is used for realizing remote control of the microwave amplitude-phase system and the scanning equipment system, processing amplitude-phase data and realizing automatic calculation of dead zone characteristics. The system can realize automatic calibration of the amplitude-phase characteristics of the plane waves in the dead zone of the compact range, and the calibration result has reference significance for helping a user to adjust the settings of the phase center, the pitching angle and the like of the feed source, so that the performance of the dead zone reaches the optimal state.
Disclosure of Invention
The invention aims to provide an automatic calibration system and method for amplitude-phase characteristics of plane waves in a dead zone of a compact range.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an automated calibration system for a range-down deadband plane wave amplitude-phase characteristic, comprising: a microwave amplitude-phase unit, a scanning equipment unit and a central control unit;
the microwave amplitude-phase unit is used for receiving signals and measuring the amplitude and the phase of the signals;
a scanning device unit for controlling the receiving position and posture of the detection probe,
and the central control unit is used for remotely controlling the microwave amplitude-phase unit and the scanning equipment unit, analyzing amplitude and phase data in real time and automatically calculating the characteristics of the dead zone.
Optionally, the central control unit comprises a main control computer, wherein the main control computer comprises a remote control module and a data processing module;
the scanning equipment unit comprises a scanning frame and a control cabinet, wherein the control cabinet provides an external interface for exchanging scanning position parameters, polarization adjustment, position information and test data.
Optionally, the calibration range is 0.5 GHz-110 GHz.
Optionally, for the near-field test of the wave band of 0.5 GHz-40 GHz, the microwave amplitude-phase system comprises a signal source, a vector network analyzer and a receiving antenna.
Optionally, for the remote test of the wave band of 0.5 GHz-40 GHz, the microwave amplitude-phase system comprises a signal source, a power amplifier, a vector network analyzer, a low-noise amplifier and a receiving antenna.
Alternatively, for tests with calibration frequencies above 40GHz, the low noise amplifier is terminated at the signal receiving end and the power amplifier is terminated at the signal transmitting end.
Optionally, the remote control module is used for controlling the rotation shaft selection, the movement start-stop position, the running speed and the running state indication of the scanning equipment unit.
Optionally, the remote control module is configured to implement instrument parameter setting for a signal source and a vector network analyzer in the microwave amplitude-phase unit, where the parameters include a scan type, a measurement mode, a test frequency, a scan time, and a point number.
An automated calibration method for the amplitude-phase characteristics of plane waves in a dead zone of a compact range comprises the following steps: s1, installing a scanning frame device carrying an automatic calibration system, determining the horizontal direction as the X direction, the vertical direction as the Y direction, the electromagnetic wave propagation direction as the Z direction, and the calibrated section being vertical to the Z axis, wherein 0 is the center of a dead zone;
s2, selecting a calibration system configuration according to the type of the calibrated compact range, and using a stable amplitude phase cable to connect the system and preheat the system;
s3, adjusting the relative incoming wave posture of the scanning frame to enable the scanning travel to be perpendicular to the incoming wave direction, and formally calibrating and collecting data by a central control system to finish calculation of the amplitude unevenness of the static field, the phase unevenness of the static field and cross polarization of the static field;
s4, setting a calibrated frequency, and recording a field intensity amplitude logarithmic value and a field intensity phase linear value of a corresponding calibration position measured when the scanning frame is in a first posture state;
s5, replacing the calibrated frequency points, and repeating the step S4 to obtain all calibrated frequency amplitude-phase test data in the working frequency range of the compact field feed source under the first posture state of the scanning frame;
s6, replacing the second scanning posture, and repeating the steps S4-S5 to obtain all corrected frequency amplitude-phase test data in the working frequency range of the compact field feed source under the second scanning posture state of the scanning frame;
s7, changing polarization modes of the feed source antenna and the receiving antenna, and repeating the steps S4-S6;
s8, replacing other frequency band feed sources, and repeating the steps S4-S7;
s9, replacing the calibration section position, and repeating the steps S3-S8 until all the main polarization is calibrated.
Optionally, step S3 further includes setting the system operating frequency to the highest calibrated compact range operating frequency; setting microwave amplitude-phase system parameters including transmitting power, intermediate frequency bandwidth and measuring channel parameters, and controlling a feed source to be consistent with a receiving antenna polarization mode;
setting test time and test compensation parameters according to the calibrated frequency, drawing a corresponding data curve by using data acquired by a calibration system, controlling a scanning frame to adjust corresponding postures according to amplitude and phase distribution trend, enabling a scanning stroke to be perpendicular to an incoming wave direction, and starting formal calibration and acquisition of data by a central control system after the scanning stroke is adjusted in place, so as to finish calculation of amplitude unevenness of a static field, phase unevenness of the static field and cross polarization of the static field.
The beneficial effects of the invention are as follows:
the invention relates to an automatic calibration system for the amplitude-phase characteristics of plane waves in a static region of a compact range, which consists of a microwave amplitude-phase unit, a scanning equipment unit and a central control unit. According to the scanning data, three indexes of the amplitude unevenness of the static field, the phase unevenness of the static field and the cross polarization of the static field are quantized, the performance of the compact field testing system is judged according to the result, and the method has reference significance for the initial inspection and the re-inspection of the compact field; meanwhile, the central control unit is designed by using an abstract and strategy mode, the model change of an instrument is packaged, the decoupling among algorithms is realized, and the increase of the system development workload caused by the diversification of compact ranges is reduced.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 shows a schematic diagram of a prior art probe scanning method.
FIG. 2 illustrates a general block diagram of a large compact range deadband performance calibration system.
Fig. 3 shows a system configuration block diagram of a close-range calibration test.
Fig. 4 shows a system configuration block diagram of a remote calibration test.
Fig. 5 shows a gantry control schematic.
Fig. 6 shows a signal source and vector network analyzer control schematic.
FIG. 7 shows a schematic diagram of the calibration results of the calibration method of the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
The compact range is a testing means widely applied to high-performance radar antennas, radome characteristic tests and radar target RCS tests, and has the advantages of wide range, high testing precision, convenience in use and the like. Currently, tens of compact ranges are built in succession in China, the types and the sizes of the compact ranges are different, and the performance difference of the static regions of the compact ranges is large. The static area performance calibration of newly built or built large compact ranges is urgently needed to develop a matched large calibration system to help users to perform initial and subsequent review of the performance of compact range test systems. The invention constructs a large-scale compact range dead zone performance automatic calibration system to realize the automatic calibration of the compact range dead zone performance, thereby ensuring the accuracy and the reliability of the antenna, the antenna housing and the target RCS test result used in the enterprise products.
There are various methods for calibrating the static area performance of the compact range, and the most internationally used method is a probe scanning method, namely, the standard probe is used for directly carrying out test evaluation on the amplitude and the phase of the plane wave field of the test area of the compact range, as shown in fig. 1.
As shown in fig. 2-7, a first embodiment of the present invention provides an automated calibration system for the amplitude-phase characteristics of a flat wave in the dead zone of a compact range, comprising: a microwave amplitude-phase unit, a scanning equipment unit and a central control unit;
the microwave amplitude-phase unit is used for receiving signals and measuring the amplitude and the phase of the signals;
a scanning device unit for controlling the receiving position and posture of the detection probe,
and the central control unit is used for remotely controlling the microwave amplitude-phase unit and the scanning equipment unit, analyzing amplitude and phase data in real time and automatically calculating the characteristics of the dead zone.
In a specific example, the microwave amplitude-phase unit is used for measuring the amplitude and the phase of a probe received signal, and mainly comprises a transmitting signal source, a receiving probe, a signal receiver and the like; the scanning equipment unit can realize the control of the receiving position and the gesture of the detection probe and mainly comprises a scanning frame and a control cabinet. The control cabinet provides an external interface to realize the exchange of scanning position parameters, polarization adjustment, position information and test data; the central control unit realizes remote control of the microwave amplitude-phase unit and the scanning equipment unit, completes real-time measurement and amplitude-phase data analysis, and realizes automatic calculation of the characteristics of a dead zone.
Specifically, the compact system is required to provide a uniform plane wave with very high polarization purity, so three indexes for evaluating the most core of the compact system are as follows: dead zone field amplitude irregularities, dead zone field phase irregularities, and dead zone field cross polarization. The first two indexes show the uniformity of the plane wave, and the latter index shows the polarization purity of the plane wave. Amplitude unevenness is defined as the difference between the maximum and minimum values of amplitude at the intersection of the detection plane and the horizontal and vertical planes. Phase unevenness is defined as the difference between the maximum and minimum values of phase at the intersection of the detection plane and the horizontal and vertical planes. Cross polarization is defined as the ratio of cross polarization measurements to homopolar measurements, and the cross polarization of the cross section is generally defined by the maximum of the ratio in the detection plane. Typical examples of the resulting amplitude and phase irregularities are flatness, conicity and waviness.
In an alternative implementation, the central control unit uses an "abstract+policy mode" comprising a host computer comprising a remote control module and a data processing module;
the scanning equipment unit comprises a scanning frame and a control cabinet, wherein the control cabinet provides an external interface for exchanging scanning position parameters, polarization adjustment, position information and test data.
In an alternative implementation, the system calibration range is 0.5GHz to 110GHz.
In an alternative implementation, for a near field test in the 0.5 GHz-40 GHz band, the microwave amplitude-phase system includes a signal source, a vector network analyzer, and a receive antenna.
In an alternative implementation, for a 0.5 GHz-40 GHz band remote test, a microwave amplitude-phase system includes a signal source, a power amplifier, a vector network analyzer, a low noise amplifier, and a receiving antenna.
In an alternative implementation, the low noise amplifier is terminated at the signal receiving end and the power amplifier is terminated at the signal transmitting end for testing at calibration frequencies above 40 GHz.
In an alternative implementation, the remote control module is configured to control spindle selection, motion start-stop positions, operating speeds, and operating status indications of the scanning device unit.
In an alternative implementation, the remote control module is configured to implement instrument parameter settings for the signal source and the vector network analyzer in the microwave amplitude-phase unit, where the parameters include a scan type, a measurement mode, a test frequency, a scan time, and a point number.
A second embodiment of the present invention provides a method for automated calibration of a flat wave amplitude-phase characteristic of a dead zone of a compact range, comprising: s1, installing a scanning frame device carrying an automatic calibration system, determining the horizontal direction as the X direction, the vertical direction as the Y direction, the electromagnetic wave propagation direction as the Z direction, and the calibrated section being vertical to the Z axis, wherein 0 is the center of a dead zone;
s2, selecting a calibration system configuration according to the type of the calibrated compact range, and using a stable amplitude phase cable to connect the system and preheat the system;
s3, adjusting the relative incoming wave posture of the scanning frame to enable the scanning travel to be perpendicular to the incoming wave direction, and formally calibrating and collecting data by a central control system to finish calculation of the amplitude unevenness of the static field, the phase unevenness of the static field and cross polarization of the static field;
s4, setting a calibrated frequency, and recording a field intensity amplitude logarithmic value and a field intensity phase linear value of a corresponding calibration position measured when the scanning frame is in a first posture state;
s5, replacing the calibrated frequency points, and repeating the step S4 to obtain all calibrated frequency amplitude-phase test data in the working frequency range of the compact field feed source under the first posture state of the scanning frame;
s6, replacing the second scanning posture, and repeating the steps S4-S5 to obtain all corrected frequency amplitude-phase test data in the working frequency range of the compact field feed source under the second scanning posture state of the scanning frame;
s7, changing polarization modes of the feed source antenna and the receiving antenna, and repeating the steps S4-S6;
s8, replacing other frequency band feed sources, and repeating the steps S4-S7;
s9, replacing the calibration section position, and repeating the steps S3-S8 until all the main polarization is calibrated.
In an alternative implementation, step S3 further includes setting the system operating frequency to the highest corrected range operating frequency; setting microwave amplitude-phase system parameters including transmitting power, intermediate frequency bandwidth and measuring channel parameters, and controlling a feed source to be consistent with a receiving antenna polarization mode;
setting test time and test compensation parameters according to the calibrated frequency, drawing a corresponding data curve by using data acquired by a calibration system, controlling a scanning frame to adjust corresponding postures according to amplitude and phase distribution trend, enabling a scanning stroke to be perpendicular to an incoming wave direction, and starting formal calibration and acquisition of data by a central control system after the scanning stroke is adjusted in place, so as to finish calculation of amplitude unevenness of a static field, phase unevenness of the static field and cross polarization of the static field.
In a first specific embodiment, the invention constructs a large compact range dead zone performance automated calibration system, which is mainly composed of a microwave amplitude-phase system, a scanning equipment system and a central control system, as shown in fig. 2.
The microwave amplitude-phase system realizes amplitude and phase measurement of a probe receiving signal and mainly comprises a transmitting signal source, a receiving probe, a signal receiver and the like.
In the calibration of the amplitude-phase characteristics of the plane waves in the static region of the compact range, the calibration range is usually 0.5 GHz-110 GHz. For the near-field test of the wave band of 0.5 GHz-40 GHz, the microwave amplitude-phase system consists of a signal source, a vector network analyzer and a receiving antenna, as shown in figure 3.
For the long-distance test of the wave band of 0.5 GHz-40 GHz, the microwave amplitude-phase system consists of a signal source, a power amplifier, a vector network analyzer, a low-noise amplifier and a receiving antenna, as shown in figure 4.
When the calibration frequency is higher than 40GHz, the signal attenuation increases, and the power amplifier and the low noise amplifier are considered at the transmitting and receiving ends respectively.
The scanning equipment system can realize the control of the receiving position and the gesture of the detection probe and mainly comprises a scanning frame and a control cabinet. The control cabinet provides an external interface to realize the exchange of scanning position parameters, polarization adjustment, position information and test data.
The central control system realizes remote control of the microwave amplitude-phase system and the scanning equipment system, completes real-time measurement and amplitude-phase data analysis, and realizes automatic calculation of the characteristics of a dead zone. The central control system comprises a remote control module and a data processing module. In the remote control module, the rotation shaft selection, the movement start-stop position, the running speed, the running state indication and the like need to be controlled for the scanning equipment, as shown in fig. 5;
instrument parameter settings for signal sources and vector network analyzers, including common scan types, measurement modes, test frequencies, scan times, and points, etc., need to be implemented for microwave amplitude-phase systems, as shown in fig. 6.
The compact system is finally provided with a uniform plane wave with very high polarization purity, so three indexes for evaluating the most core of the compact system are as follows: dead zone field amplitude irregularities, dead zone field phase irregularities, and dead zone field cross polarization. The first two indexes show the uniformity of the plane wave, and the latter index shows the polarization purity of the plane wave. Amplitude unevenness is defined as the difference between the maximum and minimum values of amplitude at the intersection of the detection plane and the horizontal and vertical planes. Phase unevenness is defined as the difference between the maximum and minimum values of phase at the intersection of the detection plane and the horizontal and vertical planes. Cross polarization is defined as the ratio of cross polarization measurements to homopolar measurements, and the cross polarization of the cross section is generally defined by the maximum of the ratio in the detection plane. Typical examples of the resulting amplitude and phase irregularities are flatness, conicity and waviness.
Flatness data processing is to statistically analyze the difference between the maximum value and the minimum value in measured data, as follows.
A fi ＝A ij-max -A ij-min
The coning data processing is to statistically analyze the difference between the maximum and minimum values of the fitting data, as follows.
A ti ＝A' ij-max -A' ij-min
The moire data processing is to statistically analyze the difference between the maximum value and the minimum value between the measured data and the fitted data as follows.
A ri ＝±[(A ij -A' ij ) max -(A ij -A' ij ) min ]/2
The data processing module acquires scanning data of the vector network analyzer, completes data curve quadratic term fitting according to a least square method, completes limit value curve calculation according to an amplitude variation upper limit of 1dB and a phase variation upper limit of 10dB, completes corresponding calculation according to flatness, conicity and ripple definition, further visually checks whether amplitude unevenness and phase unevenness are in a standard range, and achieves automatic calibration result check of a compact range, as shown in fig. 7.
In a second specific embodiment, the invention provides an automatic calibration method for the amplitude-phase characteristics of plane waves in a static area of a compact range. And finishing quantification of three indexes of the amplitude unevenness of the static field, the phase unevenness of the static field and the cross polarization of the static field according to the scanning data, and judging the performance of the compact field test system according to the calibration result. In the calibration process, whether problems exist in aspects of the pitching angle, the phase center position, the tightening range side teeth and the like of the tightening range feed source can be obtained by analyzing the change trend of the test curve, and relevant adjustment can be carried out until each index of the test curve basically meets the design requirement. The specific implementation steps are as follows:
(1) the scanning frame equipment is accurately positioned and installed in a static region of a compact range by utilizing a laser tracker, the horizontal direction is X, the vertical direction is Y, the propagation direction of electromagnetic waves is Z, the calibrated section is vertical to the Z axis, and 0 is the center of the static region. The test position meets the calibration requirement through the design of the marker bit and the positioning of the laser tracker in the compact range darkroom.
(2) And selecting proper calibration system configuration according to the type of the calibrated compact range, and carrying out system connection by using a stable-amplitude phase cable meeting the requirements, so as to preheat the system according to the requirements of equipment specifications.
(3) Adjusting the relative incoming wave gesture of the scanning frame, and setting the working frequency of the system to the highest working frequency f of the calibrated compact range max The method comprises the steps of carrying out a first treatment on the surface of the Setting parameters of a microwave amplitude-phase unit, including parameters such as proper transmitting power, intermediate frequency bandwidth, measuring channels and the like, and controlling a feed source to be consistent with a receiving antenna in polarization mode; setting proper parameters such as test time, test step length and the like according to the calibrated frequency, wherein test compensation is generally set to be one quarter of wavelength; and drawing a corresponding data curve by utilizing the amplitude-phase data acquired by the calibration system, controlling the scanning frame to adjust the corresponding gesture according to the amplitude-phase distribution trend, enabling the scanning stroke to be vertical to the incoming wave direction, and starting to formally calibrate and acquire the data by the central control system after the scanning stroke is adjusted in place, so as to finish the calculation of the amplitude unevenness of the static field, the phase unevenness of the static field and the cross polarization of the static field.
(4) Setting the calibrated frequency f 1 Recording the logarithmic value A of the field intensity amplitude of the corresponding calibration position Xj measured by the receiving device when the scanning frame is in the state of the gesture 1 (such as the horizontal direction of the calibrated section) 1j Linear value p with phase of field intensity 1j 。
(5) Changing the calibrated frequency point f i Repeating the step (4) until all the calibrated frequency amplitude-phase test data A in the working frequency range of the feed source in the state of scanning gesture 1 are obtained ij And P ij 。
(6) And (5) replacing the scanning posture 2 (such as the vertical direction of the calibrated section), and repeating the steps (4) - (5) until all the calibrated frequency amplitude-phase test data in the working frequency range of the feed source under the state of the scanning frame posture 2 are obtained.
(7) And (4) replacing the polarization modes of the feed source antenna and the receiving antenna, and repeating the steps (4) - (6).
(8) And (4) replacing feed sources of other frequency bands, and repeating the steps (4) - (7).
(9) And (3) replacing the calibration section positions, and repeating the steps (3) - (8) until all the main polarization is calibrated.
In the central control unit, in order to comprehensively control the instruments, the influence caused by the model change of the packaging instruments is realized by using an abstract and strategy mode in consideration of the fact that the instruments comprise different signal sources and different model numbers for vector network analysis. The method defines the control algorithm of the microwave amplitude-phase system, packages the control algorithm respectively, and enables the control algorithm and the control algorithm to be mutually replaced, and the change of the packaging algorithm does not affect the central control system for controlling the microwave amplitude-phase system.
With the development of stealth and anti-stealth technology research and satellite technology, the requirements on the precision and the functions of high-performance radar antennas, radome characteristic tests and radar target RCS tests are higher and higher, and the demands on compact ranges of large dead zones in China are in an ascending state. Tens of compact ranges have been built in succession in China, the types and the sizes of the compact ranges are different, and the performance difference of the compact ranges is larger. For newly built or built large compact ranges, the invention can help users to perform initial inspection and subsequent reinspection of the performance of the compact range test system.
The invention designs an automatic calibration system and method for the amplitude-phase characteristics of plane waves in a static region of a compact range, which consists of a microwave amplitude-phase system, a scanning equipment system and a central control system. After the calibration equipment is completely installed, three index quantification results of static field amplitude unevenness, static field phase unevenness and static field cross polarization can be completed according to the scanning data, and the performance of the compact field test system is judged in real time, so that the method has reference significance for primary inspection and re-inspection of the compact field. Meanwhile, the central control system is designed by using an abstract and strategy mode, the model change of an instrument is packaged, the decoupling among algorithms is realized, and the increase of the system development workload caused by the diversification of compact ranges is reduced.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. An automated calibration system for the amplitude-phase characteristics of plane waves in the dead zone of a compact range, comprising: a microwave amplitude-phase unit, a scanning equipment unit and a central control unit;
the microwave amplitude-phase unit is used for receiving signals and measuring the amplitude and the phase of the signals;
a scanning device unit for controlling the receiving position and posture of the detection probe;
and the central control unit is used for remotely controlling the microwave amplitude-phase unit and the scanning equipment unit, analyzing amplitude and phase data in real time and automatically calculating the characteristics of the dead zone.
2. The automated compact range deadband plane wave amplitude-phase characteristic calibration system of claim 1, wherein the central control unit comprises a master computer including a remote control module and a data processing module;
the scanning equipment unit comprises a scanning frame and a control cabinet, wherein the control cabinet provides an external interface for exchanging scanning position parameters, polarization adjustment, position information and test data.
3. The automated compact range deadband plane wave amplitude phase characteristic calibration system of claim 1, wherein the calibration range is 0.5GHz to 110GHz.
4. The automated compact range deadband plane wave amplitude-phase characteristic calibration system of claim 3, wherein the microwave amplitude-phase system comprises a signal source, a vector network analyzer, and a receiving antenna for near-field testing in the 0.5 GHz-40 GHz band.
5. The automated compact range deadband plane wave amplitude phase characteristic calibration system of claim 3, wherein for a 0.5 GHz-40 GHz band remote test, the microwave amplitude phase system comprises a signal source, a power amplifier, a vector network analyzer, a low noise amplifier, and a receiving antenna.
6. The automated compact range deadband plane wave amplitude phase characteristic calibration system of claim 3, wherein for a test with a calibration frequency above 40GHz, the low noise amplifier is terminated at the signal receiving end and the power amplifier is terminated at the signal transmitting end.
7. The automated compact range deadband plane wave amplitude phase characteristic calibration system of claim 2, wherein the remote control module is configured to control spindle selection, motion start-stop position, operating speed, and operating status indication of the scanning equipment unit.
8. The automated compact range deadband plane wave amplitude-phase characteristic calibration system of claim 2, wherein the remote control module is configured to implement instrument parameter settings for signal sources and vector network analyzers in the microwave amplitude-phase unit, the parameters including scan type, measurement mode, test frequency, scan time, and points.
9. An automatic calibration method for the amplitude-phase characteristics of plane waves in a static area of a compact range is characterized by comprising the following steps:
s1, installing a scanning frame device carrying the system as claimed in any one of claims 1-8, determining the horizontal direction as X direction, the vertical direction as Y direction, the electromagnetic wave propagation direction as Z direction, and the calibrated section being vertical to the Z axis, wherein 0 is the center of a dead zone;
s2, selecting a calibration system configuration according to the type of the calibrated compact range, and using a stable amplitude phase cable to connect the system and preheat the system;
s3, adjusting the relative incoming wave posture of the scanning frame to enable the scanning travel to be perpendicular to the incoming wave direction, and formally calibrating and collecting data by a central control system to finish calculation of the amplitude unevenness of the static field, the phase unevenness of the static field and cross polarization of the static field;
s4, setting a calibrated frequency, and recording a field intensity amplitude logarithmic value and a field intensity phase linear value of a corresponding calibration position measured when the scanning frame is in a first posture state;
s5, replacing the calibrated frequency points, and repeating the step S4 to obtain all calibrated frequency amplitude-phase test data in the working frequency range of the compact field feed source under the first posture state of the scanning frame;
s6, replacing the second scanning posture, and repeating the steps S4-S5 to obtain all corrected frequency amplitude-phase test data in the working frequency range of the compact field feed source under the second scanning posture state of the scanning frame;
s7, changing polarization modes of the feed source antenna and the receiving antenna, and repeating the steps S4-S6;
s8, replacing other frequency band feed sources, and repeating the steps S4-S7;
s9, replacing the calibration section position, and repeating the steps S3-S8 until all the main polarization is calibrated.
10. The automated compact range deadband plane wave amplitude phase characteristic calibration method of claim 9, wherein step S3 further comprises setting the system operating frequency to the calibrated compact range highest operating frequency; setting microwave amplitude-phase system parameters including transmitting power, intermediate frequency bandwidth and measuring channel parameters, and controlling a feed source to be consistent with a receiving antenna polarization mode;
setting test time and test compensation parameters according to the calibrated frequency, drawing a corresponding data curve by using data acquired by a calibration system, controlling a scanning frame to adjust corresponding postures according to amplitude and phase distribution trend, enabling a scanning stroke to be perpendicular to an incoming wave direction, and starting formal calibration and acquisition of data by a central control system after the scanning stroke is adjusted in place, so as to finish calculation of amplitude unevenness of a static field, phase unevenness of the static field and cross polarization of the static field.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022117049467 | 2022-12-29 | ||
| CN202211704946 | 2022-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116559753A true CN116559753A (en) | 2023-08-08 |
Family
ID=87491623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310665915.3A Pending CN116559753A (en) | 2022-12-29 | 2023-06-06 | Automatic calibration system and method for amplitude-phase characteristics of plane waves in static region of compact range |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116559753A (en) |
-
2023
- 2023-06-06 CN CN202310665915.3A patent/CN116559753A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113225147B (en) | Method, device and system for measuring total radiation power of array antenna | |
| WO2022095510A1 (en) | Calibration method and device for array antenna, and storage medium | |
| CN110018361B (en) | Phased array antenna gain noise temperature ratio measuring method and system | |
| CN107632210B (en) | Terahertz antenna plane near field measurement system | |
| CN104730503B (en) | Determine methods and compensation method of the high resolution SAR reference target RCS on calibration influence | |
| JP2003529983A (en) | Method and apparatus for measuring the performance of antennas, mobile phones, and other wireless terminals | |
| CN116047436A (en) | Near-field amplitude-phase calibration method, system and equipment for active phased array radar antenna | |
| CN111337758B (en) | Antenna radiation efficiency measuring method based on reverberation chamber | |
| CN112859076A (en) | RCS imaging measurement device and measurement method for low-scattering target | |
| CN109709407B (en) | Cylindrical surface field quiet zone amplitude and phase detection system | |
| CN112834830A (en) | Antenna near-field coupling measurement device and method | |
| CN112710903A (en) | Phase center testing method based on multi-probe spherical field antenna testing system | |
| CN111929708B (en) | Antenna and receiving channel calibration system and method for signal quality evaluation | |
| CN117250412A (en) | Test method and test system for vehicle-mounted 5G antenna | |
| WO2023016571A1 (en) | Radio frequency index measurement method, apparatus and system, electronic device, and storage medium | |
| CN116559753A (en) | Automatic calibration system and method for amplitude-phase characteristics of plane waves in static region of compact range | |
| CN109921865B (en) | Calibration rod approximate simulation calibration system and method for full-space phased array antenna | |
| CN115047257A (en) | Automatic antenna measuring system based on spherical surface near field measurement | |
| CN112505630B (en) | Analysis compensation method of millimeter wave radar | |
| CN111682907A (en) | Satellite antenna isolation high-precision test system | |
| CN114264888B (en) | SAR load satellite pulse electromagnetic leakage testing method | |
| CN111416652A (en) | Method and equipment for measuring base station parameters | |
| YANG | The measurement of antenna VSWR by means of a Vector Network Analyzer | |
| Alexander et al. | CISPR standard for calibration of EMC antennas | |
| CN117375736B (en) | Differential mode injection test method and system for electromagnetic compatibility sensitivity test |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |