CN102788909B - Method for measuring surface accuracy of antenna by adopting holographic method - Google Patents
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Abstract
The invention provides a method for measuring the surface accuracy of an antenna by adopting the holographic method, comprising the following steps: providing a reference antenna and a single-point frequency signal source; receiving the signals from the signal source respectively, inputting the signals into a related machine, and resolving the cross-correlation phase difference of the received two ways of signals of the signal source in real time; providing a reference signal; receiving reference signals respectively, inputting the reference signals into a related machine, and resolving the cross-correlation phase difference of the received two ways of reference signals in real time; subtracting the cross-correlation phase difference of the two ways of reference signals from the cross-correlation phase difference of two ways of signals of the signal source to obtain a difference component; and subjecting the difference component to two-dimensional inverse Fourier transform to obtain the surface accuracy of the measured antenna. Compared with the conventional holographic measurement technology, the method for improving the phase position accuracy can improve the holographic measurement accuracy effectively, separate the space propagation errors effectively and, receive the system errors. In addition, the method can be used for the holographic measurement of any satellite signal, so that the implementation of the holographic measurement engineering is improved.
Description
Technical field
The present invention relates to the method adopting holography method to measure surface accuracy of antenna.
Background technology
Microwave holography method is an important method of parabola antenna surface testing, and it is based on following electromagnetic theory and a geometry fact that holography method measures surface accuracy of antenna.
Electromagnetic theory: because the far field of antenna and aperture field exist two-dimensional Fourier transform relation, by measuring amplitude and the phase place of complex number plane internal antenna radiation field (far field), just can be released amplitude and the PHASE DISTRIBUTION of antenna aperture field by mathematical measure, then just can understand antenna surface face shape according to the geometric relationship in parabola and bore face and depart from paraboloidal situation.Fig. 1 is a desirable circular equiphase bore face, and Fig. 2 is its far-field radiation map of magnitudes, and both are by two-dimensional Fourier transform opening relationships, that is obtains wherein that any one just can release another by mathematical measure.
Geometry is true: if desirable parabola, focus there is emissive source, signal is through parabolic reflector, Wave-front phase value so in bore plane will everywhere equal (because equal to the optical path length of bore plane from focus), but in the realistic case, antenna surface can not be completely desirable parabola, so the phase place in bore plane is also inevitable unequal, when signal source wavelength is known, by detecting this phase differential, the minute differences between antenna surface and desirable parabola just can be determined theoretically.Fig. 3 is one and distorts wavefront schematic diagram intuitively.
On the realization rate measured, first the high speed processing performance of hardware is utilized, obtain the holographic information of Antenna Far Field in real time, the namely amplitude of corresponding diagram 2 and phase place, then data calibrated and compensate, again two-dimentional inverse Fourier transform is done to these data, obtain aperture field phase place and energy distribution (the namely information of Fig. 1, certain Fig. 1 is desirable constant phase front, reality phase place on bore face departs to some extent), release antenna surface shape finally by geometric relationship strict between parabola and bore face and depart from desirable paraboloidal deviation.
We make use of the general hardware device in domestic VLBI research station at present, set up our desired measuring system, this comprises tested She Shan 25 meters of antenna (i.e. main antennas, MainAntenna), Ku band receiver, hydrogen atomic clock (Maze), VLBI baseband converter (BBC), for the multi-purpose computer of sky line traffic control and data record.The equipment that will configure in addition has bore 1.2 meters of reference antennas and hardware to shut down mutually.We have employed the beacon signal of the 12.26GHz of synchronous satellite Sinosat-1, as measuring signal.Because signal source must meet far field condition, for She Shan 25 meter radio telescope, far field distance condition is
D-antenna aperture (25m); The wavelength (12.26GHz correspondence about 2.4cm) of λ-holographic measurement signal source
Know by investigating us, the actual range of Sinosat-1 distance She Shanzhan is about 36952km, so satellite-signal meets far field condition completely.
Fig. 4 shows the hardware system that the current holographic measurement possessed is used, and in figure, main antenna is tested antenna; Reference antenna is used to the change of tracking signal source, and the down coversion link of two antennas is identical.Wherein: AMP is pre-low-noise amplifier, DRO is that dielectric oscillator (by 10MHz frequency multiplication to 11.3GHz) is as local oscillation signal, the Ku wave band high-frequency signal of the 12.26GHz of antenna reception is mixed to about 960MHz, then by cable transmission to VLBI BBC (very long baseline interference baseband converter), be down-converted to again within 4MHz, finally two-way baseband signal is sent into and shut down mutually, with Real-time solution cross-correlation phase place and amplitude, and auto-correlation amplitude.The data obtained of shutting down mutually are transferred to PC/ data record, and then are transferred to antenna control unit.
When measurement, reference antenna is all the time facing to satellite-signal, main antenna then does network scanning as Fig. 5 (object is to obtain far-field information) around signal source, and allow main antenna directional signal source every two minutes, effectively can follow the tracks of the change of cross-correlation phase place and amplitude like this.Whole measurement observation time is 1 and a half hours, and the bore space of planes resolution of use is 0.5 meter.
Fig. 6 is the flow chart of data processing block diagram of current employing.Wherein, relevant rear data message comes phase place, amplitude after the two paths of signals cross-correlation of auto-correlation machine reception, and the auto-correlation amplitude information of two antennas.Main antenna points to data, refers to the time of main antenna real time record when doing network scanning around satellite, orientation and pitch information, and status information, from antenna computer for controlling.By above two data, just cross-correlation phase information during network scanning state accurately can be extracted (far-field information that this information is exactly main antenna), also the record data of data quality accessment can just be provided this time, after grid data is calibrated, according to the mathematical relation of Antenna Far Field and aperture field, just the aperture field information of antenna can be solved out from far-field information by two-dimentional inverse Fourier transform, so just be aware of the deformation situation (being exactly face shape gradient search, the reconstruct of face shape in mapping process) in bore face.Finally statistical information and drawing output.Wherein grid data is aligned in a great extent by face shape computational accuracy final for impact, therefore needs to provide in a kind of holographic measurement can improve grid data calibration thus the method improving face shape computational accuracy.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of method adopting holography method to measure surface accuracy of antenna.
Adopt holography method to measure a method for surface accuracy of antenna, comprising: a reference antenna and single-point signal source are frequently provided; Tested antenna and described reference antenna receive the signal from described signal source respectively and are input to the cross-correlation phase differential of the two paths of signals source signal received with antenna tested described in real-time resolving and described reference antenna in shutdown mutually; One reference signal is provided; Described tested antenna receives described reference signal respectively with described reference antenna and is input to the cross-correlation phase differential of the two-way reference signal received with antenna tested described in real-time resolving and described reference antenna in shutdown mutually; The cross-correlation phase differential of described two paths of signals source signal deduct described two-way reference signal cross-correlation phase differential obtain a difference component; Two-dimentional inverse Fourier transform is carried out to described difference component thus obtain described tested antenna surface accuracy of antenna distribution.
Adopt holography method to measure a method for surface accuracy of antenna, comprising: provide a signal source and a reference antenna, described signal source is multiple spot frequency or broadband signal; Tested antenna and described reference antenna receive the signal from described signal source respectively and are input to the cross-correlation phase differential of the two paths of signals source signal received with antenna tested described in real-time resolving and described reference antenna in shutdown mutually, and facing to described signal source, described tested antenna does network scanning around described signal source to wherein said reference antenna all the time; Overall treatment is carried out to obtain the cross-correlation phase differential comprehensively to described signal source signal; To described comprehensive after cross-correlation phase differential carry out two-dimentional inverse Fourier transform thus obtain described tested antenna surface accuracy of antenna distribution.
Compared with the holographic measurement technology of routine, adopt the method for this raising phase accuracy, effectively can improve the precision of holographic measurement, and can effective separate space propagated error, receiving system error.And holographic measurement be may be used to for any satellite-signal, improve the Project Realization of holographic measurement.
Accompanying drawing explanation
Fig. 1 shows the desirable circular equiphase bore face of antenna;
Fig. 2 shows the far-field radiation map of magnitudes in the face of bore shown in Fig. 1;
Fig. 3 shows the wavefront schematic diagram of distortion;
Fig. 4 shows existing holographic measurement hardware system;
Fig. 5 shows the network scanning figure that main antenna carries out around signal source;
Fig. 6 shows the flow chart of data processing figure in existing holographic measurement.
Fig. 7 shows holographic measurement hardware system of the present invention.
Embodiment
Describe the present invention below in conjunction with accompanying drawing.
At the flow chart of data processing alignment grid data of holographic measurement mainly in order to deduct the error of measuring amount, or perhaps improve the accuracy of measuring amount.Here main measuring amount is that the phase place that cross-correlation obtains (namely enters the phase differential of the two paths of signals shut down mutually, an effect of shutting down mutually is exactly the phase differential of real-time resolving two paths of signals, if this two paths of signals identical single point-frequency signal that is frequency, just understanding of very well, be exactly at this time the phase differential of two sine wave signals, " phase place " mentioned herein all refers to the phase differential of two paths of signals).In order to improve the accuracy of phase place, present applicant proposes following methods:
The hardware system that the method adopts as shown in Figure 7.In close signal source, such as in the frequency of beacon signal 12.26GHz, artificially is injected or is launched a reference signal (main antenna and reference antenna inject by a reference signal simultaneously in other words), such as produce this reference signal by signal generator as shown in Figure 7, remainder is same as shown in Figure 4.Main antenna and the two-way reference signal that reference antenna receives enter into through identical down coversion link to shut down mutually (also needs reference antenna herein all the time facing to reference signal, main antenna then does network scanning around reference signal), then in aftertreatment, the cross-correlation phase differential of this two-way reference signal is extracted (namely according to frequency, the cross-correlation phase differential (namely isolating the cross-correlation phase differential of two paths of signals source signal and the cross-correlation phase differential of two-way reference signal according to frequency) of two-way reference signal is extracted in the output information of shutting down mutually, the relative instability of two antenna receiving systems has just been reacted in the change of this cross-correlation phase differential, if this phase differential is PHA (ref), and the cross-correlation phase differential of beacon signal 12.26GHz being used for measuring be PHA (holo) (under normal circumstances, the two-dimentional inverse Fourier transform of PHA (holo) just can obtain the precision distribution of panel, this is also the means adopted in prior art), and in this method, utilize PHA (holo)-PHA (ref) this difference component to do the precision distribution that two-dimentional inverse Fourier transform obtains panel, because this difference component falls the error counteracting of two antenna receiving systems, but remain real far-field phase change information simultaneously.The former just can be isolated by this amount of PHA (ref) that the problem of antenna receiving system or atmospheric disturbance cause, if just can be easy to deduct the error that this fluctuation causes.This method can PHA (holo) and PHA (ref) in time situation of change all record, PHA (ref) has only reacted the impact that atmospheric disturbance brings, because components of system as directed has balanced out after being subtracted.PHA (holo), then not only with systematic influence but also with atmospheric effect, by comparing this two data sequences, just can distinguish.The advantage of this method is that all errors of system are peeled off on to greatest extent, but needs to design hardware system (mainly the design of Ku wave band Injection Signal and installation).
Second method is multiple spot frequency and bandwidth synthesis method: the signal to noise ratio (S/N ratio) improving useful signal after the multiple frequency on satellite and broadband signal comprehensively superpose, the final accuracy improving phase place.Some satellites are not only have a beacon signal, and some satellites then do not have beacon signal at all.For these two kinds of distinct situations, in order to make full use of signal on various satellite, can to multiple spot beacon and broadband signal overall treatment frequently.If multiple spot just directly can do average treatment to multiple cross-correlation phase place frequently frequently, if broadband signal, first will calculate delay (delay=delt (the phase)/delt (f) in bandwidth, the namely slope of cross-correlation phase versus frequency, this information is easy to calculate from the output information of shutting down mutually), do delay compensation again, finally do plural number average.
After obtaining the cross-correlation phase place comprehensively, just can comprehensive to this after cross-correlation phase place do calibration process, the core way of this process is: the phase information (general two minutes intervals) when utilizing two adjacent, main antennas and reference antenna simultaneously to point to satellite does linear interpolation process, these interpolated datas calculated are corresponding with phase place during network scanning to be subtracted each other, and this just achieves phase information that is final, that can be used for doing two-dimentional inverse Fourier transform.Adopt this method, compared with differential phase calibration method above, stability and the signal to noise ratio (S/N ratio) of phase place can be improved equally.
The foregoing is only preferred embodiment of the present invention, and be not used to limit scope of the present invention, the above embodiment of the present invention can also make a variety of changes.Namely every claims according to the present patent application and description are done simple, equivalence change and modify, and all fall into claims of the present invention.
Claims (4)
1. adopt holography method to measure a method for surface accuracy of antenna, comprising:
One reference antenna and single-point signal source are frequently provided;
Tested antenna and described reference antenna receive the signal from described signal source respectively and are input to the cross-correlation phase differential of the two paths of signals source signal received with antenna tested described in real-time resolving and described reference antenna in shutdown mutually;
One reference signal is provided;
Described tested antenna receives described reference signal respectively with described reference antenna and is input to the cross-correlation phase differential of the two-way reference signal received with antenna tested described in real-time resolving and described reference antenna in shutdown mutually;
The cross-correlation phase differential of described two paths of signals source signal deduct described two-way reference signal cross-correlation phase differential obtain a difference component;
Two-dimentional inverse Fourier transform is carried out to described difference component thus obtain described tested antenna surface accuracy of antenna distribution.
2. the method adopting holography method to measure surface accuracy of antenna as claimed in claim 1, is characterized in that, facing to described signal source, described tested antenna does network scanning around described signal source to described reference antenna all the time.
3. the as claimed in claim 1 method adopting holography method to measure surface accuracy of antenna, is characterized in that, the frequency of described reference signal is close to the frequency of described signal source.
4. the method adopting holography method to measure surface accuracy of antenna as claimed in claim 1, is characterized in that, is input in described shutdown mutually after the down coversion link that described tested antenna is identical through two-way respectively with the signal source signal that reference antenna receives and reference signal.
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| CN103926548B (en) * | 2014-04-18 | 2016-09-28 | 中国科学院新疆天文台 | A kind of method of quick measurement radio telescope reflector precision |
| CN105627977B (en) * | 2015-12-29 | 2018-03-23 | 中国科学院上海天文台 | A kind of method for measuring large-scale parabola antenna gravity deformation |
| CN106908662B (en) * | 2017-02-24 | 2019-03-08 | 中国科学院上海天文台 | A kind of high frequency continuous spectrum scanning observation method based on dualbeam difference |
| CN107192893A (en) * | 2017-06-26 | 2017-09-22 | 泰姆瑞技术（深圳）有限公司 | A kind of method of antenna measurement system and antenna measurement system stability of eliminating the effects of the act |
| CN111929508B (en) * | 2020-07-16 | 2022-12-27 | 中国电子科技集团公司第四十一研究所 | Electric thickness information extraction method and device capable of resisting environmental drift |
| CN112986701B (en) * | 2021-02-23 | 2023-03-21 | 中国科学院国家天文台 | Holographic measurement method and system based on radio frequency power supply broadband signal |
| CN115473538B (en) * | 2022-08-25 | 2023-08-04 | 中国科学院紫金山天文台 | Method and device for realizing real-time cross-correlation of high-speed multi-frequency dual-channel data |
| CN116541968B (en) * | 2023-06-28 | 2023-09-22 | 南京航空航天大学 | Determination method of ground-moon DRO optimal transfer orbit |
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| CN101656971B (en) * | 2009-08-14 | 2012-05-23 | 同济大学 | High-precision wireless channel test bench based on virtual antenna array and method thereof |
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| JP2600770B2 (en) * | 1988-03-08 | 1997-04-16 | 日本電気株式会社 | Phased array radar device |
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| 全息法测量天线面表面精度;王锦清等;《中国科学院上海天文台年刊》;20071231(第28期);第109-112页 * |
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