CN105043284A - System and method for large-scale radar antenna deformation real time measurement - Google Patents
System and method for large-scale radar antenna deformation real time measurement Download PDFInfo
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Abstract
The invention relates to a large-scale radar antenna deformation real time measurement system, comprising a plurality of PSD laser sensors for measuring the deformation amount of deformation key points and laser sources corresponding to the deformation key points on one-to-one basis; the output terminal of the PSD laser sensor is connected to the input terminal of a data collection unit; the output terminal of the data collection unit is connected to the input terminal of the data processing unit; the output terminal of the data processing unit is connected to the input terminal of a deformation display unit for displaying whole deformation curve surface of an antenna array on real time. The invention also discloses a large-scale radar antenna deformation real time measurement method. The invention converts the whole field deformation measurement of a super big array to a series of relative deformation measurements corresponding to the key points, which is simple in theory, small in devices, high in accuracy, fast in processing data, and can satisfy the real time performance measurement needs for big array surfaces and high accuracy.
Description
Technical field
The present invention relates to Large Radar phased array antenna distortion Real-time Measuring Technique field, especially a kind of Large Radar Antenna distortion real-time measurement system and method.
Background technology
The various factors such as gravity load, wind load, thermal force, attitude change all will bring impact to antenna precision, particularly high-precision requirement radar, and antenna structure distortion be can not ignore the impact of its performance.The requirement of structural design is generally needed its Deformation control within 1/10 ~ 1/20 wavelength, as being less than 1.8mm for high-band antenna as X-wave band autenna (wavelength is about 36mm) then needs to control its distortion, and Ka wave band (9mm) is even needed to make it be out of shape being less than 0.45mm.Along with front bore increases, in order to ensure front precision, contradiction between rigidity Design and weight certainly will be aggravated, in order to ensure that rigidity often needs to pay huge weight cost, especially its temperature deformation of large-scale antenna is determined by its size, by the more difficult control of conventional structure design means temperature deformation.Therefore, in order to reduce structural design difficulty and cost, improve antenna precision, for Large Radar Antenna, current a kind of feasible thinking measures in real time wavefront distortion, and calculate the phase changing capacity being out of shape and causing, carry out the equal electrical property in real-time position and compensate, thus eliminate the impact of malformation on telecommunication energy.
The method of antenna being carried out to malformation measurement comprises the methods such as sensor measurement, laser measurement, vision measurement, but for Large Radar Antenna, the difficulty that its distortion is carried out measuring in real time is that large scale and high precision, large area and high-level efficiency are two pairs of contradiction amounts, realize difficulty larger simultaneously, especially also require stronger environmental suitability for rotating antenna and be easy to through engineering approaches and implement, general measuring method is more difficult realization generally.The existing high-precision deformation measuring system for large front is typical in vision measurement system, multiple camera is adopted to take from different visual angles, the volume coordinate of measuring object is obtained by parameter calibration by stickup target and caliberating device, the method defect is that processing speed is relatively slow, real-time measurement cannot be realized, and the limited repetitive measurement that needs in measurement visual field splices, and is not suitable for the real-time measurement of large front.In addition, as adopted the measuring system of the equipment such as laser scanner, also all there is shortage real-time, system complex, being subject to measure the problem such as visual angle and measurement space restriction in other measuring system.
Summary of the invention
Primary and foremost purpose of the present invention is to provide a kind of measurement demand that can meet the large front of radar, high precision, real-time, and the microdeformation amount solving large scale Radar Antenna Structure detects the Large Radar Antenna distortion real-time measurement system of a difficult problem.
For achieving the above object, present invention employs following technical scheme: a kind of Large Radar Antenna distortion real-time measurement system, comprise multiple for the PSD laser sensor measured of deflection of distortion key point and and its LASER Light Source one to one, the output terminal of PSD laser sensor is connected with the input end of data acquisition unit, the output terminal of data acquisition unit is connected with the input end of data processing unit, and the output terminal of data processing unit is connected with the input end of the distortion display unit for showing antenna array whole field deformation in real time.
Described multiple PSD laser sensor is arranged in the framework deformation key point of antenna array upper end, and described LASER Light Source is arranged on the little position of antenna array deflection, and the laser spots vertical incidence that LASER Light Source sends is at the center position of PSD laser sensor.
A PSD laser sensor for relative deformation between laser light source is arranged between described two adjacent LASER Light Source.
Another object of the present invention is to provide a kind of Large Radar Antenna to be out of shape method for real-time measurement, the method comprises the step of following order:
(1) PSD laser sensor generation current signal after the laser that LASER Light Source sends irradiates;
(2) data acquisition unit gathers current signal, and current signal is converted to voltage signal, and carry out amplifying, filtering, then by analog to digital conversion circuit, simulating signal is converted into data-signal, this data-signal is the deformation data of each distortion key point;
(3) deformation data of each distortion key point is sent to data processing unit, obtains being out of shape converting algorithm by finite element structural analysis and fitting algorithm, calculate whole field deformation data through distortion converting algorithm;
(4) be out of shape display unit and carry out real-time curved surface Dynamic Announce to whole field deformation, meanwhile, whole field deformation data are stored by database as project data.
The deformation data of described distortion key point is as follows to the distortion converting algorithm of the antenna whole audience:
[dA]=[Φd]
T[Φd]
-1[Φd]
T[d]
Wherein, [Φ d] represents whole audience displacement modes, and d is the key point displacement of actual measurement, [dA] whole field deformation for calculating.
As shown from the above technical solution, the invention has the advantages that: first, by the present invention, super large front full field deformation measure is converted into the right relative deformation of a series of key point to measure, principle is simple, equipment amount is little, precision is high, data processing is quick, meets large front, high precision and real-time measurement demand simultaneously; The second, measurement space and taking measurement of an angle is required low, be applicable to radar large front outfield real-time testing; 3rd, another outstanding benefit of this measuring system is, when its be finally used to radar beam compensate time, can be used as an independent system and exist and avoid increasing radar system complexity.In a word, can obtain by the present invention the malformation that large-scale ground antenna causes due to gravity, attitudes vibration, temperature etc. in real time, the real-Time Compensation of the electrical property distortion of antenna can be carried out on this basis.The present invention not only can be applicable to the real-time fields of measurement of Large Radar phased array antenna distortion, and the microdeformation for general large scale structure detects same being suitable for, and has broad application prospects.
Accompanying drawing explanation
Fig. 1 is systematic schematic diagram of the present invention;
Fig. 2 is the block diagram of system of the present invention;
Fig. 3 is method flow diagram of the present invention;
Fig. 4 is the installation site schematic diagram of the embodiment of the present invention one;
Fig. 5,6,7,8 is certain radar antenna deformation pattern figure obtained by the present invention.
Embodiment
As shown in Figure 1, measuring system is measured for fundamental measurement unit with PSD laser sensor 1, and arrange according to certain rule on antenna array 3 surface and measure network, relatively same reference point obtains the relative deformation of each key point.Can whole field deformation be calculated according to this deformation data and by the deformation pattern that structure analysis obtains, according to the wavefront distortion data of real-time Transmission, just can be undertaken deformation-compensated by disposal routes such as corresponding bit phase delays.Large Radar Antenna can be obtained in real time due to the malformation that wind carries, temperature etc. causes by the present invention, and carry out the real-Time Compensation of the electrical property distortion of this antenna.
As shown in Figure 2, a kind of Large Radar Antenna distortion real-time measurement system, comprise multiple for the PSD laser sensor 1 measured of deflection of distortion key point and and its LASER Light Source 2 one to one, the output terminal of PSD laser sensor 1 is connected with the input end of data acquisition unit, the output terminal of data acquisition unit is connected with the input end of data processing unit, and the output terminal of data processing unit is connected with the input end of the distortion display unit for showing antenna array 3 whole field deformation in real time.
As shown in Figure 3, this method comprises the following steps: (1) PSD laser sensor 1 generation current signal after the laser that LASER Light Source 2 sends irradiates; (2) data acquisition unit gathers current signal, and current signal is converted to voltage signal, and carry out amplifying, filtering, then by analog to digital conversion circuit, simulating signal is converted into data-signal, this data-signal is the deformation data of each distortion key point; (3) deformation data of each distortion key point is sent to data processing unit, obtains being out of shape converting algorithm by finite element structural analysis and fitting algorithm, calculate whole field deformation data through distortion converting algorithm; (4) be out of shape display unit and carry out real-time curved surface Dynamic Announce to whole field deformation, meanwhile, whole field deformation data are stored by database as project data.
The deformation data of described distortion key point is as follows to the distortion converting algorithm of the antenna whole audience:
[dA]=[Φd]
T[Φd]
-1[Φd]
T[d]
Wherein, [Φ d] represents whole audience displacement modes, and d is the key point displacement of actual measurement, and [dA] whole field deformation for calculating, T is general matrix operation symbol.
As shown in Figure 4, described multiple PSD laser sensor 1 is arranged on antenna array 3 upper end skeleton 4 and is out of shape in key point, described LASER Light Source 2 is arranged on the little position of antenna array 3 deflection, and the laser spots vertical incidence that LASER Light Source 2 sends is at the center position of PSD laser sensor 1.Arrange a PSD laser sensor 1 for relative deformation between laser light source 2 between described two adjacent LASER Light Source 2, the upper end of described antenna array 3 skeleton 4 loads pallet charger 6 by pulley 5.
Embodiment one
As shown in Figure 4, this embodiment for Large size Aluminium skeleton 4 antenna, front size 10 meters × 10 meters.Consider front size, measure range and wavefront distortion pattern, top skeleton 4 is out of shape layout corresponding to key point 12 PSD laser sensors 1, arrange 12 LASER Light Source 2 at front deformation of bottom smaller part, make LASER Light Source 2 laser spots vertical incidence in the center of PSD laser sensor 1.Meanwhile, arrange between LASER Light Source 2 PSD laser sensor 1 to measure measurement 12 light sources between relative deformation, this deformation values is relatively little, is finally formed on front surface and measures network.After applying certain load by skeleton 4 posterior tray charger 6, skeleton 4 produces distortion, and measuring system obtains the deformation values of 12 relatively same LASER Light Source 2 of key point in real time.Because this framework deformation pattern is relatively simple, carry out matching through finite element analysis, converting algorithm can be described by the form of equation, and the wavefront distortion equation that the embodiment of such as this Fig. 4 is corresponding can be described as:
d(x,y)=a
1x+a
2y+a
3x
2+a
4xy+a
5y
2+a
6x
3+a
7xy
2+a
8x
3y+a
9x
2y
2
The deformation measurement value of each group of measured acquisition distortion key point is substituted into above-mentioned equation, and uses least square method to resolve acquisition 9 coefficient values, i.e. a
1, a
2, a
3, a
4, a
5, a
6, a
7, a
8, a
9thus obtain whole field deformation data.The validity of the measured data obtained have passed through the checking of third-party deformation measuring device, and maximum deformation quantity 3mm, error is less than 0.03mm.
As shown in Fig. 5,6,7,8, by setting up the finite element model of front, wavefront distortion under various load is analyzed, and extract corresponding deformation mode respectively, because the deformation pattern of large-scale front is relatively simple, several primary deformable pattern only can be extracted in converting algorithm uses.
Below in conjunction with Fig. 1 to 8, the present invention is further illustrated.
Measure relative position change between two points in the present invention and adopt point-to-point measurement, namely PSD laser sensor 1 directly obtains the relative position change of LASER Light Source 2 by measuring photosite location change.Right according to the measurement that certain rule layout multichannel is same on whole front measurement plane, this layout rule is determined by the deformation pattern of structure, different structures presents different deformation patterns under different load, this deformation pattern can carry out structure analysis acquisition by finite element means, therefore, PSD laser sensor 1 is arranged in interested key point position, and LASER Light Source 2 is arranged in the place that on front, deflection is relatively little.Simultaneously, in order to obtain the deformation values of each key point of relatively same datum mark, relative position between the LASER Light Source 2 that each measurement is right also by such measurement to measuring, also namely finally can be obtained the shift value of the relatively same reference point of all key points by the conversion of measuring basis, thus obtain the relative deformation figure of whole front.
The right deformation values of measured measurement is transmitted into PC and processes, the first step is treated to data filtering process, namely judge the accuracy of the deformation data measured, the measurement data of debug, the effect of filtering process is to prevent estimating because of single error data influence bulk deformation; Second step is treated to the matching of whole field deformation, and the relative deformation being about to the key point measured is converted into the distortion of the antenna whole audience in real time.The deformation pattern of antenna is obtained by means such as Finite Element Simulation Analysis, testing laboratory's mechanical test and the tests of antenna true environment.Obtain abundant antenna deformation pattern and not only can carry out the matching of key point deformation data to whole field deformation, also can carry out the position optimization that sensor is layouted simultaneously on this basis.Deformation data is transferred in the beam point steering system of phased array antenna, by certain wave beam backoff algorithm, corrects in real time to phase array antenna beam.Therefore, can realize carrying out real-Time Compensation to electrical loss of energies such as the beam positions that malformation causes by the present invention.
In sum, by the present invention, super large front full field deformation measure is converted into the right relative deformation of a series of key point and measures, principle is simple, equipment amount is little, precision is high, data processing is quick, meets large front, high precision and real-time measurement demand simultaneously; This measuring method requires low to measurement space and taking measurement of an angle, be applicable to radar large front outfield real-time testing.
Claims (5)
1. a Large Radar Antenna distortion real-time measurement system, it is characterized in that: comprise multiple for the PSD laser sensor measured of deflection of distortion key point and and its LASER Light Source one to one, the output terminal of PSD laser sensor is connected with the input end of data acquisition unit, the output terminal of data acquisition unit is connected with the input end of data processing unit, and the output terminal of data processing unit is connected with the input end of the distortion display unit for showing antenna array whole field deformation in real time.
2. Large Radar Antenna distortion real-time measurement system according to claim 1, it is characterized in that: described multiple PSD laser sensor is arranged in the framework deformation key point of antenna array upper end, described LASER Light Source is arranged on the little position of antenna array deflection, and the laser spots vertical incidence that LASER Light Source sends is at the center position of PSD laser sensor.
3. Large Radar Antenna distortion real-time measurement system according to claim 1, is characterized in that: arrange a PSD laser sensor for relative deformation between laser light source between described two adjacent LASER Light Source.
4. a Large Radar Antenna distortion method for real-time measurement, the method comprises the step of following order:
(1) PSD laser sensor generation current signal after the laser that LASER Light Source sends irradiates;
(2) data acquisition unit gathers current signal, and current signal is converted to voltage signal, and carry out amplifying, filtering, then by analog to digital conversion circuit, simulating signal is converted into data-signal, this data-signal is the deformation data of each distortion key point;
(3) deformation data of each distortion key point is sent to data processing unit, obtains being out of shape converting algorithm by finite element structural analysis and fitting algorithm, calculate whole field deformation data through distortion converting algorithm;
(4) be out of shape display unit and carry out real-time curved surface Dynamic Announce to whole field deformation, meanwhile, whole field deformation data are stored by database as project data.
5. Large Radar Antenna distortion method for real-time measurement according to claim 4, is characterized in that: the deformation data of described distortion key point is as follows to the distortion converting algorithm of the antenna whole audience:
[dA]=[Φd]
T[Φd]
-1[Φd]
T[d]
Wherein, [Φ d] represents whole audience displacement modes, and d is the key point displacement of actual measurement, [dA] whole field deformation for calculating.
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| CN105526879A (en) * | 2015-11-30 | 2016-04-27 | 上海卫星工程研究所 | In-orbit measuring system and method for deformation of satellite large-array-plane antenna based on fiber grating |
| CN105547174A (en) * | 2015-11-27 | 2016-05-04 | 上海无线电设备研究所 | Distributed high-precision laser online measurement system |
| CN106094562A (en) * | 2016-05-27 | 2016-11-09 | 中国人民解放军国防科学技术大学 | Membrane structure deformation measurement and Control release system |
| CN107883855A (en) * | 2017-10-20 | 2018-04-06 | 西安空间无线电技术研究所 | It is a kind of based on photogrammetric high and low temperature environment Light deformation method of testing |
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| CN105526879A (en) * | 2015-11-30 | 2016-04-27 | 上海卫星工程研究所 | In-orbit measuring system and method for deformation of satellite large-array-plane antenna based on fiber grating |
| CN106094562A (en) * | 2016-05-27 | 2016-11-09 | 中国人民解放军国防科学技术大学 | Membrane structure deformation measurement and Control release system |
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| CN108088358B (en) * | 2017-12-18 | 2019-08-20 | 电子科技大学 | One kind being based on more baseline radar track deformation detecting methods |
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| CN111829430A (en) * | 2020-06-29 | 2020-10-27 | 南京航空航天大学 | Large flexible body deformation monitoring device with inversion function |
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| CN112084584A (en) * | 2020-07-30 | 2020-12-15 | 航天东方红卫星有限公司 | Manufacturing method of star sensor support capable of monitoring deformation and deformation measuring method |
| CN112084584B (en) * | 2020-07-30 | 2024-03-15 | 航天东方红卫星有限公司 | Manufacturing method of star sensor bracket capable of monitoring deformation |
| CN111982001A (en) * | 2020-08-26 | 2020-11-24 | 北京无线电测量研究所 | Deformation measurement system and method |
| CN112461147A (en) * | 2020-10-16 | 2021-03-09 | 深圳大学 | Bridge dynamic deformation monitoring method and system based on visual measurement technology |
| CN113108753A (en) * | 2021-04-13 | 2021-07-13 | 中国电子科技集团公司第三十八研究所 | Method and system for measuring deformation of unfolding and folding mechanism and unfolding and folding mechanism |
| CN113108753B (en) * | 2021-04-13 | 2023-06-27 | 中国电子科技集团公司第三十八研究所 | Method and system for measuring deformation of unfolding and folding mechanism and unfolding and folding mechanism |
| CN113948846A (en) * | 2021-10-12 | 2022-01-18 | 北京微纳星空科技有限公司 | Satellite-borne phased array antenna temperature deformation calibration system, measurement system and method |
| CN114543668A (en) * | 2022-01-24 | 2022-05-27 | 上海卫星工程研究所 | Measuring system and method suitable for ultra-large array plane orientation change |
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Application publication date: 20151111 |