CN104569588A - Laser compensation method for high-frequency linear phase detection of plane wave of compact range - Google Patents

Laser compensation method for high-frequency linear phase detection of plane wave of compact range Download PDF

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Publication number
CN104569588A
CN104569588A CN201410796709.7A CN201410796709A CN104569588A CN 104569588 A CN104569588 A CN 104569588A CN 201410796709 A CN201410796709 A CN 201410796709A CN 104569588 A CN104569588 A CN 104569588A
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China
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phase
plane wave
compact range
scanning support
laser
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CN201410796709.7A
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Chinese (zh)
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CN104569588B (en
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马永光
康宁
尚柱岗
韩玉峰
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北京无线电计量测试研究所
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Abstract

The invention discloses a laser compensation method for high-frequency linear phase detection of plane wave of a compact range. The laser compensation method comprises the following steps: building a three-dimensional rectangular coordinate system in a dark chamber of a compact range to be detected; determining an initial position of a scanning frame according to a relation between position of a feed source, position of a reflective surface and position of a test area; adjusting a vertical attitude angle and a horizontal attitude angle of the scanning frame and enabling phase detection trend to meet the requirement on the performance of the plane wave; arranging a laser target on a probe antenna of the scanning frame, arranging a laser tracking instrument between the scanning frame and the reflective surface, capturing the position of the laser target in real time by the laser tracking instrument to obtain position information and position deviation delta x of the scanning frame; obtaining a phase deviation result of the plane wave according to a relation between light speed, working frequency and phase, and compensating the deviation result into a phase detection result in real time. The laser compensation method can be used for meeting the requirements on phase detection of the plane wave of the compact range at the high frequency and improving the phase detection accuracy of the plane wave of the compact range.

Description

A kind of Compact Range plane wave high-frequency detection phase place straight-line detection laser compensation method

Technical field

The present invention relates to a kind of Compact Range plane wave high-frequency detection phase place straight-line detection laser compensation method.

Background technology

Compact Range, because of advantages such as its measuring accuracy are high, easy to use, has become the necessaries of the high-acruracy survey such as radar target RCS characteristic, target seeker tracking, stealth material performance, advanced capabilities radar antenna and antenna house characteristic.Compact Range adopts accurate reflecting surface, closely the spherical wave that point source produces can be transformed to plane wave, and evaluating the good and bad most crucial index of Compact Range test section plane wave performance is plane-wave field phase place unevenness.To phase place non-planeness measurement, current the most frequently used a kind of mode sets up a scanning support in test section exactly, and make scanning support track while scan perpendicular to arrival bearing, detection system layout as shown in Figure 1.

Current Problems existing is, when carrying out high frequency performance to phase place and detecting, if the scanning probe machinery plane be arranged on scanning support and plane wave constant phase front depart to some extent, phase measurement can be caused to produce comparatively big error, and this phenomenon is more obvious when frequency improves.As shown in Figure 2, suppose that probe mechanically moving plane and plane wave constant phase front depart from 1mm, so relative wavelength within the scope of 2GHz ~ 40GHz, phase place will depart from and changes to 48 ° from 2.4 °.Compact Range phase place roughness design technical indicator when 40GHz is only 20 °, then 48 ° of phase deviations that scanning support mechanical precision brings are insufferable to testing result, in frequency higher than seeming more important during 40GHz.Thus, when carrying out phase measurement, need to adopt high-precision flat scanning frame.But after scanning support repeatedly uses, self-technique index meeting severe exacerbation, and the detection sectional plane range of size of Compact Range can reach 2m ~ 12m, in so large regional extent, making the straight path linearity index of probe movement meet the centesimal technical requirement of frequency wavelength to be measured, is very difficult realization when reality detects.

Institute thinks Compact Range plane wave phase-detection requirement when meeting high frequency, needs to study a kind of effective method and solves above deficiency.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of Compact Range plane wave high-frequency phase straight-line detection laser compensation method, Compact Range plane wave high-frequency phase straight-line detection laser compensation method of the present invention can solve above deficiency effectively, the impact that scanning support straightness error brings to phase-detection can be made up in real time by the method designed, Compact Range plane wave phase-detection requirement when can meet high frequency, improves Compact Range plane wave phase-detection precision.

For solving the problems of the technologies described above, the present invention adopts following technical proposals:

A kind of Compact Range plane wave high-frequency phase straight-line detection laser compensation method, the step of the method comprises:

In Compact Range darkroom to be checked, set up three-dimensional cartesian coordinate system;

According to the position relationship of feed location, reflection line position and test section, determine the initial position of scanning support;

The vertical of scanning support and horizontal attitude angle are adjusted, makes its phase-detection trend meet plane wave performance requirement;

The probe antenna of scanning support arranges laser target, and a laser tracker is set between scanning support and reflecting surface, catch laser target cursor position in real time by laser tracker, obtain scanning support positional information and position deviation △ x;

According to the light velocity, frequency of operation and phase relation, obtain the phase deviation result of plane wave, and real-time for this bias contribution is compensated in phase detection result.

Preferably, determine that the step of scanning support initial position comprises

Utilize phase test instrument to carry out initial survey to cross section to be checked phase propetry, by electro-detection, judge whether scanning support entirety is ajusted;

According to phase place initial survey result, suitably adjustment scanning support vertical and horizontal attitude angle, until phase-detection trend meets plane wave performance requirement.

Preferably,

The frequency of operation of Compact Range to be checked is F, and the light velocity is C, then corresponding wavelength is C/F, according to position deviation △ x, calculates corresponding plane wave phase deviation △ p: △ p=△ x/ (C/F) × 360 °.

Preferably, the method comprises further, analyzes, obtain the change information of Compact Range plane wave phase place to be checked to the phase place after compensating.

Beneficial effect of the present invention is as follows:

Existing Compact Range high-frequency detection frequency can reach 40GHz ~ 110GHz, dead band range can reach 2m ~ 12m, the linearity index of requirement probe movement is one of percentage of frequency wavelength to be checked, i.e. 0.075mm ~ 0.0273mm, make within the scope of scanning support 2m ~ 12m, to keep so high linearity index request always, be very difficult to realize, along with the decline of scanning support precision, the Testing index precision of Compact Range plane wave phase place will be difficult to ensure.Compact Range plane wave high-frequency phase straight-line detection laser compensation method of the present invention can solve above deficiency effectively, the impact that scanning support straightness error brings to phase-detection is made up in real time by the inventive method, Compact Range plane wave phase-detection requirement when can meet high frequency, improves Compact Range plane wave phase-detection precision.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Fig. 1 illustrates Compact Range test section phase place non-flatness measurement system layout schematic diagram;

Fig. 2 illustrates with detection frequency rising phase deviation result;

Fig. 3 illustrates Compact Range plane wave phase place straight-line detection laser compensation schematic layout pattern;

Fig. 4 illustrates detection system schematic layout pattern;

Fig. 5-a and 5-b illustrates laser target cursor position real-time offsets record.

Embodiment

In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.

A kind of Compact Range plane wave high-frequency phase straight-line detection laser compensation method, the step of the method comprises:

In Compact Range darkroom to be checked, by laser tracker 6, according to conditions such as the positions of the position of the position of compact feed 1, Compact Range reflecting surface 2, reflecting surface center, test section 3, to scanning support 4 initial position fix;

Utilize phase test system, initial survey cross section to be checked phase propetry, by electro-detection, judge whether scanning support 4 entirety is ajusted, according to phase place initial survey result, suitably adjustment scanning 4 frame vertical and horizontal attitude angle, until phase-detection trend meets plane wave performance requirement; Wherein, phase test system comprises vector network analyzer 7, scanning support controls cabinet 8, the network switch 9 and computer for controlling 10;

The probe antenna that scanning support 4 is provided with installs laser target 5, a laser tracker 6 is set between scanning support 4 and Compact Range reflecting surface 2, control laser tracker 6 and catch laser target cursor position in real time, position feedback information real time record, record position deviation is △ x;

If Compact Range frequency to be checked is F, the light velocity is set to C, then corresponding wavelength is C/F, is △ x according to position deviation, then corresponding phase deviation is △ p=△ x/ (C/F) × 360 °;

After obtaining phase deviation result, by control software design, phase deviation result is compensated in phase detection result in real time, show phase detection result in real time by control software design;

According to data analysis software, analyze phase detection result, obtain the change information of Compact Range plane wave phase place to be checked.

A laser target 5 is installed in the present invention additional on the probe antenna of scanning support 4, a laser tracker is set in the plane wave propagation region between scanning support 4 and Compact Range reflecting surface 2, the probe positions of laser tracker Real-time Collection laser target 5 feedback, position deviation data Real-time Feedback to computing machine, according to range deviation, by phase only pupil filter algorithm, real-Time Compensation phase measurement.As shown in Fig. 3 Compact Range plane wave phase place straight-line detection laser compensation schematic layout pattern, probe antenna is arranged on test section scanning support 4, should move according to the theory locus in Fig. 3 in theory, namely along moving perpendicular to arrival bearing's vertical direction or horizontal direction, but due to the linearity deviation of scanning support 4 self, the stroke of probe movement is the wave actual path in Fig. 3, and even have slope trend, scanning support does not strictly ajust attitude.Therefore install additional on the probe antenna of scanning support in technical scheme of the present invention and fix a laser target, a laser tracker 6 is set in the plane wave propagation region between scanning support 4 and Compact Range reflecting surface 2, along with the movement of probe, target 5 can feed back to laser tracker 6 positional information in real time, tracker can record data, and pass to computing machine, according to the scanning support deviation obtained, bring in phase only pupil filter algorithm, obtain phase compensation result, recycling computing machine compensates and corrects phase detection result in real time.

Fig. 1 is existing only by the accuracy of detection of scanning support self accuracy guarantee Compact Range plane wave phase place, and the present invention has following different from it:

The present invention utilizes laser tracker and laser target can know the position deviation of scanning support in real time;

The present invention, by phase only pupil filter algorithm, can obtain phase deviation according to position deviation, can real-Time Compensation phase result.

Below by one group of embodiment, the invention will be further described:

1, detection system schematic layout pattern as shown in Figure 4, and phase detection is vector network analyzer, and scanning support stroke is 2m × 2m, can move with horizontal direction in the vertical direction;

2, in Compact Range darkroom to be checked, by laser tracker 6, according to conditions such as the positions of the position of the position of compact feed 1, Compact Range reflecting surface 2, reflecting surface center, test section 3, to scanning support 4 initial position fix;

3, phase test system is utilized, initial survey cross section to be checked phase propetry, pass through electro-detection, judge whether whole 4 bodies of scanning support are ajusted, according to phase place initial survey result, suitably adjustment scanning support vertical and horizontal attitude angle, until phase-detection trend meets plane wave performance requirement, wherein, phase test system comprises vector network analyzer 7, scanning support controls cabinet 8, the network switch 9 and computer for controlling 10;

4, probe antenna is installed laser target 5, a laser tracker 6 is set in the plane wave propagation region between scanning support 4 and Compact Range reflecting surface, control the position that laser tracker 6 catches laser target 5 in real time, the feedback information of this position of real time record, the deviation △ x of record position simultaneously, as shown in Fig. 5-a, when antenna moves 2m stroke as we can see from the figure, the nearly 3mm of course deviation, this numerical value not only contains the linearity precision of scanning support equipment, the error caused when further comprises the location adjustment of scanning support machinery, namely the actual path in Fig. 3 adds and departs from trend, in figure, horizontal ordinate represents horizontal direction, ordinate represents biased error,

5, set Compact Range frequency to be checked as F, the light velocity is set to C, then corresponding wavelength is C/F, is △ x according to position deviation, then corresponding phase deviation is △ p=△ x/ (C/F) × 360 °;

6, after obtaining phase deviation result, in real time by control software design in phase deviation result compensation of phase testing result, the phase detection result in real time after display compensating approach;

According to data analysis software, obtain the change information of Compact Range plane wave phase place to be checked, as shown in Fig. 5-b, result shown in this figure is Comparative result before and after the phase only pupil filter that obtains under horizontal polarization 40GHz horizontal direction mobile condition, after revising, phase curve changes within the scope of 20 °, meets Investigation On Plane Wave Characteristics, improves measuring accuracy, in figure, horizontal ordinate represents and moves horizontally direction, and ordinate represents phase place.

Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all embodiments, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.

Claims (4)

1. a Compact Range plane wave high-frequency phase straight-line detection laser compensation method, it is characterized in that, the method comprises the following steps:
In Compact Range darkroom to be checked, set up three-dimensional cartesian coordinate system;
According to position relationship in darkroom of compact feed, reflecting surface and test section and coordinate, determine the initial position of scanning support;
The vertical of scanning support and horizontal attitude angle are adjusted, makes its phase-detection trend meet plane wave performance requirement;
The probe antenna of scanning support arranges laser target, and plane wave propagation path between scanning support and reflecting surface arranges a laser tracker, catch laser target cursor position in real time by laser tracker, obtain positional information and the position deviation △ x of scanning support;
According to the position deviation of the frequency of operation of Compact Range, the light velocity and scanning support, obtain the phase deviation result of plane wave, and real-time for this bias contribution is compensated in phase detection result.
2. method according to claim 1, is characterized in that, determines that the step of scanning support initial position comprises
Utilize vector network analyzer to carry out initial survey to cross section to be checked phase propetry, by electro-detection, judge whether scanning support entirety is ajusted;
According to phase place initial survey result, suitably adjustment scanning support vertical and horizontal attitude angle, until phase-detection trend meets plane wave performance requirement.
3. method according to claim 1, is characterized in that,
The frequency of operation of Compact Range to be checked is F, and the light velocity is C, then corresponding wavelength is C/F, according to position deviation △ x, calculates corresponding plane wave phase deviation △ p: △ p=△ x/ (C/F) × 360 °.
4. method according to claim 1, is characterized in that, the method comprises further, analyzes, obtain the change information of Compact Range plane wave phase place to be checked to the phase place after compensating.
CN201410796709.7A 2014-12-18 2014-12-18 A kind of Compact Range plane wave high-frequency detection phase straight-line detection laser compensation method CN104569588B (en)

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CN106093918A (en) * 2016-08-23 2016-11-09 中国电子科技集团公司第四十研究所 The triggering pulse outgoing position error correction system and method for gantry dynamic test
CN107462779A (en) * 2017-06-30 2017-12-12 上海卫星工程研究所 Phase of cable error measuring means and its method of testing between microwave imaging satellite plate
CN108663572A (en) * 2018-02-23 2018-10-16 北京无线电计量测试研究所 A kind of plane wave phase multistage measurement joining method
CN108732427A (en) * 2018-04-02 2018-11-02 北京环境特性研究所 A kind of phase compensation Reflector Panel for the test of Compact Range darkroom
CN108802501A (en) * 2018-04-19 2018-11-13 北京无线电计量测试研究所 A kind of Compact Range scanning means
CN109709407A (en) * 2019-01-14 2019-05-03 北京航空航天大学 A kind of cylinder field dead zone width phase detection system

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106093918A (en) * 2016-08-23 2016-11-09 中国电子科技集团公司第四十研究所 The triggering pulse outgoing position error correction system and method for gantry dynamic test
CN106093918B (en) * 2016-08-23 2018-05-25 中国电子科技集团公司第四十一研究所 The trigger pulse outgoing position error correction system and method for scanning support dynamic test
CN107462779A (en) * 2017-06-30 2017-12-12 上海卫星工程研究所 Phase of cable error measuring means and its method of testing between microwave imaging satellite plate
CN107462779B (en) * 2017-06-30 2020-01-24 上海卫星工程研究所 Testing method of device for measuring phase error of cable between microwave imaging satellite boards
CN108663572A (en) * 2018-02-23 2018-10-16 北京无线电计量测试研究所 A kind of plane wave phase multistage measurement joining method
CN108663572B (en) * 2018-02-23 2020-06-30 北京无线电计量测试研究所 Plane wave phase multi-section measurement splicing method
CN108732427A (en) * 2018-04-02 2018-11-02 北京环境特性研究所 A kind of phase compensation Reflector Panel for the test of Compact Range darkroom
CN108802501A (en) * 2018-04-19 2018-11-13 北京无线电计量测试研究所 A kind of Compact Range scanning means
CN109709407A (en) * 2019-01-14 2019-05-03 北京航空航天大学 A kind of cylinder field dead zone width phase detection system

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