CN108254744A - A kind of rcs measurement method and measuring system based on wave beam deflection - Google Patents
A kind of rcs measurement method and measuring system based on wave beam deflection Download PDFInfo
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- CN108254744A CN108254744A CN201711477328.2A CN201711477328A CN108254744A CN 108254744 A CN108254744 A CN 108254744A CN 201711477328 A CN201711477328 A CN 201711477328A CN 108254744 A CN108254744 A CN 108254744A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
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Abstract
The present invention proposes a kind of rcs measurement method and system deflected based on wave beam, in two one are hung support system, changes aircraft pitch angle α by adjusting the length of lifting rope；Turntable rotation drives aircraft to realize azimuth of target φ variations, carries out the rcs measurement of target；In addition, in described two one rcs measurements for hanging progress target in support system, it is designed by the defocusing of compact feed phase center, electromagnetism wave ray is made to generate wave beam deflection angle γ with turntable rotary shaft z, by adjusting electromagnetism wave ray and wave beam deflection angle γ, aircraft pitch angle α, the turntable azimuth φ of turntable rotary shaft z1Realize big circular scan or conical scanning.The present invention is based on the rcs measurement methods and measuring system of wave beam deflection, increase the measurement range of zenith angle θ；Data integrity is improved, region area can be surveyed by increasing, and improve the quantity of Validity Test data；In the case where not increasing workload as possible, the safety for improving target movement is used in combination in two kinds of different scanning methods.
Description
Technical field
The invention belongs to low Observable technical field, a kind of target in more particularly to true operation invisbile plane rcs measurement
The application process and technology of branch crane system.
Background technology
The radar cross section (Radar Cross Section abbreviation RCS) of complex target is frequency F, polarized state
The function of (HH, VV, VH, HV) and feature attitude angle θ, φ.
Feature attitude angle characterizes the angle of plane electromagnetic wave direction and target, sees Fig. 3.For accurate description attitude angle θ, φ,
Target-based coordinate system, aircraft alignment x ' axis are established on tested aircraft, and is overlapped with fuselage axis, the horizontal plane and x ' y ' of aircraft are flat
Face overlaps, and z ' axis is vertical with aircraft back.
In Fig. 3, the angle of θ z ' axis and electromagnetism wave ray claims zenith angle；φ is projected for electromagnetism wave ray in plane x ' y '
With the angle of x ' axis, claim azimuth of target.Radar is a point in target-based coordinate system, radar site by three independent parameter r,
θ, φ are determined.
X=rsin θ cos φ
Y=rsin θ sin φ
Z=rcos θ (1)
When θ ∈ (0, pi/2), φ ∈ (0,2 π), whole angles of radar illumination aircraft will be covered, can obtain the total space
, unique radar cross section σ (θ, φ).
To be distinguished with aircraft pitch angle α, yaw angle and roll angle in flight mechanics, when discussing radar cross section,
By the angle theta of radar ray and aircraft, φ definition is characterized attitude angle.
Usual ground static state rcs measurement is in given frequency, polarization, changes the appearance between target and radar ray
State angular measurement σ (θ, φ).
Traditionally, the method for changing attitude angle θ, φ relies primarily on the rotating mechanism of Metal pylon, as shown in Figure 4.
Fig. 4 a) in the inclination of electromagnetism wave ray and rotary shaft be defined as conical scanning, Fig. 4 b) in electromagnetism wave ray and rotary shaft
Vertically it is defined as big circular scan.φ is azimuth of target, φ1For turntable azimuth.To conical scanning, azimuth of target φ variations
When, zenith angle θ is constant, aircraft pitch angle α=a (φ)；To big circular scan, turntable azimuth φ1During variation, α is constant, zenith angle
θ=θ (φ1)。
The device and method for carrying out posture angle sweep have：
1. foam stand belongs to big circular scan；
2. metallic support, turntable has azimuth of target φ to rotate and zenith angle θ rotations in cantilever tip (claiming to turn top), emphasis
Turn, belong to conical scanning；
3. two one are hung support system, belong to big circular scan；
4. electromagnetism wave ray rotation (motionless with electromagnetism wave ray, target rotation is equivalent), belongs to circular cone in zenith angle θ directions
Scanning.
To 1:There are shortcoming, inconvenience uses for the rcs measurement of 1 actual load, foam stand and metallic support.Two one are hung support
System can complete turntable azimuth φ1Rotation, but when aircraft pitch angle α rotating ranges are big, it may appear that safety issue.
By compact feed defocusing, it can be achieved that electromagnetism wave ray rotates.Although its rotation angle γ is smaller, quilt is considered
The safety of aircraft is surveyed, has started to explore the application of ray rotation in rcs measurement.
Such as measured target size bigger, the difficulty of zenith angle θ rotations is carried out by rack mechanical structure to be increased, ray rotation
Scan method will be paid attention to by bigger.
The two one general work patterns for hanging support system are shown in Fig. 5.
Two one are the advantages of hanging support system：1. turntable is in stent in the following, with enough load-bearing capacities；It 2. can be real
Existing turntable azimuth φ1Rotation, is stretched by lifting rope, realizes the adjustment of aircraft pitch angle α；3. target sets up not broken to aircraft
It is bad.
Two one have the shortcomings that hanging support system：
1. strut and the lifting rope RCS high of itself, it is necessary to pass through the decrement that complex technology carries out stent system RCS.
2. measurement parameter aircraft pitch angle α and turntable azimuth φ1Feature attitude angle θ, the φ being not required, therefore cannot
Directly obtain the σ (θ, φ) of requirement.Needing will by coordinate transformBecause transformation is non-linear, in θ, φ
Measurable data area is 64% or so in plane.
3. measured target quality is very high, aircraft pitch angle α is adjusted than relatively hazardous using lifting rope.Therefore controllable aircraft
The variation range of pitch angle α is smaller.
Invention content
The technical problem to be solved in the present invention is：Support system is hung by two one to be used in combination with what wave beam deflected, is solved
Certainly two two shortcomings for hanging big circular scan rcs measurement in a support system：1) aircraft pitch angle α variation ranges are smaller, and 2) it is big
The measurement data that the test data of circular scan transforms to conical scanning does not have integrality.
The present invention provides a kind of rcs measurement methods based on wave beam deflection, in two one are hung support system, one-dimensional turn
For platform in pitch rotation mechanism in the following, turntable table top is parallel to the ground, turntable rotary shaft z is perpendicular to the ground；Two struts are fixed on
On turntable, and it is vertical with turntable table top, and two struts are realized with aircraft in point (b) and point (c) and are mechanically connected；It is fixed on roof
(a) point at lifting rope and aircraft back connect, lifting rope is overlapped with turret axis, is fixed aircraft by (a), (b), 3 points of (c)
In the air；Change aircraft pitch angle α by adjusting the length of lifting rope；Turntable rotation makes aircraft realize turntable azimuth φ1Change
Change, carry out the rcs measurement of target；Wherein, in described two one rcs measurements for hanging progress target in support system, by tight
The defocusing design of contracting field feed phase center, makes electromagnetism wave ray generate wave beam deflection angle γ with turntable rotary shaft z, by adjusting
Wave beam deflection angle γ, aircraft pitch angle α, the turntable azimuth φ of electromagnetism wave ray and turntable rotary shaft z1Realize big circular scan or
Conical scanning.
In the above-mentioned rcs measurement method based on wave beam deflection, when electromagnetism wave ray is vertical with turntable rotary shaft z, electricity
Wave beam deflection angle γ=0 ° of magnetic wave ray and turntable rotary shaft z, for different aircraft pitch angle α, turntable rotation changes and turns
Platform azimuth φ1Realize big circular scan.
It is inclined for different wave beams when aircraft pitch angle α=0 ° in the above-mentioned rcs measurement method based on wave beam deflection
Corner γ, turntable rotation change turntable azimuth φ1Realize conical scanning.
It is one-dimensional in two one are hung support system the present invention also provides a kind of rcs measurement system based on wave beam deflection
For turntable in pitch rotation mechanism in the following, turntable table top is parallel to the ground, turntable rotary shaft z is perpendicular to the ground；Two struts are fixed
On turntable, and it is vertical with turntable table top, and two struts are realized with aircraft in point (b) and point (c) and are mechanically connected；It is fixed on room
The lifting rope on top and (a) point at aircraft back connect, and lifting rope is overlapped with turret axis；Aircraft is fixed at 3 points by sky by a, b, c
In；Change aircraft pitch angle α by adjusting the length of lifting rope；Turntable rotation drives aircraft to realize turntable azimuth φ1Change into
The rcs measurement of row target；Wherein, which further includes the defocusing module of compact feed phase center, passes through machinery
Arm makes compact feed phase center off-focal, so as to make electromagnetic wave perpendicular to the position of feed direction of illumination translation feed
Ray generates wave beam deflection angle γ with turntable rotary shaft z, by adjusting the wave beam deflection angle of electromagnetism wave ray and turntable rotary shaft z
γ, aircraft pitch angle α, turntable azimuth φ1Realize big circular scan or conical scanning.
In the above-mentioned rcs measurement system based on wave beam deflection, aircraft pitch angle α variations and turntable azimuth φ1Variation
Transverse component is generated at the spherical linkage that will be connect in strut with aircraft；When aircraft pitch angle α changes, the component is along before fuselage
Rear direction；Turntable azimuth φ1During variation, the component is along fuselage left and right directions；Component in the front-back direction is equal, left and right directions
Component is also equal.This patent provides a kind of new technology to the rcs measurement of large-scale target, the conjunction to master-plan and test specification
Reason, which is formulated, directive significance.It is a kind of new that two one, which are hung posture angle sweep to be combined progress rcs measurement with radar ray rotation,
Operating mode.The advantages of this pattern：
1. increase the range of zenith angle θ measurements：Δ θ=± (α+γ)；
2. improving data integrity, region area can be surveyed by increasing：
3. improve the quantity of Validity Test data；
4. the safety for improving target movement is used in combination in two kinds of different scanning methods, and workload increase is limited.
Description of the drawings
Fig. 1 two one hangs support system structure diagram；
Wave beam deflection schematic diagram is realized in defocusing design in the rcs measurement method that Fig. 2 is deflected the present invention is based on wave beam；
Fig. 3 aircrafts coordinate and the definition of feature attitude angle；
Two class attitude angle scanning means of Fig. 4；
Fig. 5 two hangs the general work pattern of one；
When Fig. 6 is using the rcs measurement method deflected the present invention is based on wave beam, the data profile of aircraft pitch angle α variations；
When Fig. 7 is using the rcs measurement method deflected the present invention is based on wave beam, α=± 20 °, the curve of γ=± 10 °；
When Fig. 8 is using the rcs measurement method deflected the present invention is based on wave beam, α=± 20 °, γ=± 5 °, 10 ° of curve.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment further illustrates the present invention.
It is after foam stand and low reflective metals stent, for the novel target of rcs measurement that two one, which are hung support system,
Stent is shown in attached drawing 1.
In two one are hung support system, one-dimensional turntable in the following, turntable table top is parallel to the ground, turns in pitch rotation mechanism
Platform rotary shaft z is perpendicular to the ground.Two struts are fixed on turntable, and vertical with turntable table top.Two struts are in point b and point
C is realized with aircraft and is mechanically connected.The lifting rope for being fixed on roof is connect with a points at aircraft back, and lifting rope is overlapped with turret axis,
3 points aircraft is fixed in the air by a, b, c.It can change aircraft pitch angle α by adjusting the length of lifting rope.Turntable rotates
Aircraft is driven to realize turntable azimuth φ1Variation carries out the rcs measurement of target.
Two one are hung stent load-bearing capacity height, and target erecting device does not destroy target, therefore 1:1 actual load aircraft
RCS has good application prospect in measuring.
In order to ensure the reliability of the safety of measured target and system, the aircraft pitch that two crane systems can be realized
Angle α ranges are not high, such as ± 15 °, are usually unsatisfactory for user demand.
The present invention provides a kind of rcs measurement systems based on wave beam deflection, and the rcs measurement system is in addition to including above-mentioned two
Branch one hangs support system, the defocusing module of compact feed phase center is further included, by mechanical arm perpendicular to feed irradiation side
To the position of translation feed, make compact feed phase center off-focal (defocusing design), so as to make electromagnetism wave ray with turning
Platform rotary shaft z generates wave beam deflection angle γ, by adjusting electromagnetism wave ray and wave beam deflection angle γ, the aircraft of turntable rotary shaft z
Pitch angle α, turntable azimuth φ1Realize big circular scan or conical scanning.In terms of Machine Design, the translation of feed mechanical arm is increased
The degree of freedom of movement.Two struts on fixed turntable support aircraft, the lifting rope connection aircraft back on roof in (b), (c) point
(a) point adjusts aircraft pitch angle α by flexible lifting rope, connect the mechanical arm of compact feed perpendicular to feed direction of illumination into
Row translational motion, realizes the defocusing of feed and the deflection of wave beam, and turntable rotation drives aircraft to realize turntable azimuth φ1Variation.
Aircraft pitch angle α changes and turntable azimuth φ1Change at the spherical linkage that can be all connect in strut with aircraft and produce
Raw transverse component；When aircraft pitch angle α changes, the component is along fuselage front-rear direction；Turntable azimuth φ1During variation, the component
Along fuselage left and right directions；Component in the front-back direction is equal, and the component of left and right directions is also equal.
Compact Range is being used, can realize that wave beam deflects by feed defocusing, so as to which the aircraft for expanding measurement is bowed
Angle of elevation alpha is shown in Fig. 2.
When compact feed is in parabolic focus A, Compact Range generates the ray for being parallel to ground；When in feed phase
When the heart leaves parabolic focus A and is moved to point A ', the ray of Compact Range tilts down, i.e., wave beam deflects down γ angles, sees Fig. 2,
Then aircraft pitch angle α is from initial alpha1Increase to α2=α1+γ。
When electromagnetism wave ray is vertical with turntable rotary shaft z, the wave beam deflection angle γ of electromagnetism wave ray and turntable rotary shaft z
=0 °, for different aircraft pitch angle α, turntable rotation changes turntable azimuth φ1Realize big circular scan.Obtaining at this time can
Using the area of measurement data as 64%, the area of immeasurability data is 36%.
When aircraft pitch angle α=0, for different wave beam deflection angle γ, turntable rotation changes turntable azimuth φ1It realizes
Conical scanning.Coordinate big circular scan, in this Optimization Work pattern, the area that can measure data is 90%, promotes 26%, can not
The data area of measurement is reduced to 10%.The sampled point n1 of aircraft pitch angle α is less (for example, n1<10).If in turntable orientation
Angle φ1The sampled point in direction is n2, total sampled point n=n1 X n2.Under Optimizing Mode, total sampled point increases to 2n.Two classes are surveyed
The sampled point coincidence point of amount is few, and the overwhelming majority is misaligned.
The movement of aircraft pitch angle α and wave beam deflection angle γ are completely independent in above-mentioned two classes measurement process.The first kind measures
Only aircraft pitch angle α changes, and two struts do not change at this time；Second class, which measures, only has wave beam deflection angle γ variations, at this time
Lifting rope does not change.
Big circular scan and being used in combination for conical scanning can encounter some challenges.If for example, wave beam deflection angle γ
It is identical with the symbol of aircraft pitch angle α, it can play the role of increasing aircraft pitch angle α, and if wave beam deflection angle γ is with flying
The symbol of machine pitch angle α is on the contrary, γ increases, then α reduces.
φ is azimuth of target, φ1For turntable azimuth.By coordinate transform, by great circle scanning survey result σ (α, φ1)
σ (θ, φ), then the with due regard to effect of wave beam deflection angle γ are transformed to, can two kinds of turntable scan methods be integrated use is expired
The result of meaning.
1. if the aircraft pitch angle α of two crane systems is equal to ± α, wave beam deflection angle is equal to ± γ, then total zenith
The measurement range of angle θ increases to ± (α+γ)；
2. after wave beam deflection angle γ effects, in zenith angle θ and turntable azimuth φ1In plane, region can be surveyed
Area Se increases by 10% or so.
Two one are hung support system and have turntable coordinate system xyz and aircraft axes x ' y ' z ' in Fig. 4, in order to by big circular scan
Measurement result be transformed into conical scanning requirement as a result, coordinate transform must be carried out.
If by changing the length of lifting rope, aircraft pitch angle α is from-α~α；Turntable rotates, turntable azimuth φ1From 0~
360 °, obtain measurement result σ (α, φ1), by coordinate transform in θ, φ planes obtain data σ (θ, φ), see Fig. 6.
As an example, aircraft pitch angle α from -20 °~20 °, is spaced 5 ° in Fig. 6.All curves are all fallen in α=± 20 °
In region between two curves, there are measurement data in the region (title can survey region).Region other than the region does not have data
(claiming Un-measurable area).
Consider that the curve after the wave beam deflection angle γ that feed defocusing generates is shown in Fig. 7.As an example, it is assumed that wave beam deflection angle γ
=± 10 °.When γ=+ 10 °, on θ, φ planes, the curve in Fig. 7 moves up on zenith angle θ directions.γ=-
At 10 °, α=20 ° of Fig. 7, γ=10 ° curve and α=- 20 °, γ=10 ° curve move down.The variation range at θ angles reaches
±30°。
For wave beam rotation, radar ray is tilted with rotary shaft, and posture angle sweep at this time is defined as conical scanning.Essence
It is upper equivalent with metallic support.In turntable azimuth φ1During movement, the zenith angle θ of aircraft is constant, aircraft pitch angle α variations.Work as wave
Beam deflection angle γ is from during -10~10 variation, and the aircraft pitch angle α in head and tail direction increases or reduces, in turntable side
Parallactic angle φ1When being 90 and 270, aircraft pitch angle α=0, ray rotation makes aircraft generate roll motion.
Aircraft pitch angle α is from -20 °~20 °, and wave beam deflection angle γ is equal to ± 5 ° and ± 10 °, turntable azimuth φ1From 0~
360 ° of variations, the result of measurement is σ (alpha, gamma, φ1).By coordinate transform by σ (α, γ, φ1) → σ (θ, φ) obtains the song of Fig. 8
Line.
As seen from Figure 8, when not considering wave beam deflection angle γ, on θ, φ planes, the measurement range of zenith angle θ is 70 °~
110 °, Δ θ=± 20 °.When wave beam deflection angle γ=± 5 °, ± 10 °, the measurement range of zenith angle θ is 60 °~120 °, Δ θ
=± 30 °.α variations in aircraft pitch angle change plus wave beam deflection angle γ, the measurement range of zenith angle θ
Δ θ=± (α+γ) (2)
In Fig. 8, there are four Un-measurable area, and wherein the upper left corner can not survey area and be indicated with thick line.It can be proved that area face can be surveyed
Accumulating Se is
γ and α is wave beam deflection angle and aircraft pitch angle in formula.Area can not be surveyed as Snot=1-Se。
As γ=0, Se=64%.As γ=10, during α=20, Se=76%.γ/α is bigger, and the ratio of data effective district is got over
It is high.
The basic skills being used in combination of two kinds of posture angle sweep is measured in great circle scanning system, is passed through
Measurement result is transformed into θ by coordinate transform, and φ planes are finally overlapped.Such as：
1st, do not considering wave beam deflection angle γ, 9 measurement (- 20/-15/-10/- are carried out in great circle scanning system
5/0/5/10/15/20), by coordinate transform by measurement resultObtain data profile shown in Fig. 6；
2nd, γ=10 ° are enabled, are measured in great circle scanning system, by coordinate transform by measurement resultα=- 20 ° in Fig. 7, γ=10 ° curve and α=20 ° are obtained, γ=10 ° curve surrounds area
Data distribution in domain；
3rd, γ=- 10 ° are enabled, are measured in great circle scanning system, by coordinate transform by measurement resultObtain α=- 20 ° in Fig. 7, γ=- 10 ° curve and α=20 °, γ=- 10 ° curve packet
Enclose the data distribution in region；
The amount of work measured three times is to measure 27 times, and workload hangs 3 times of increase than simple two one.
In Fig. 8, there is the area distribution of data than more uniform, measurement needs can be met.In figure there are two because
Two one are hung " overlapping region " for measuring and generating with wave beam rotary joint, such as the region surrounded with diamond shape.It goes through, each
The data being completely superposed in overlay region only have 20 multiple spots, therefore the amount of redundancy measured is few, and playing increases test point quantity
Effect.
The point that overlay region is completely superposed is the intersection point of two curves, and the measuring condition of two curves of corresponding intersection point is different.
Such as aircraft pitch angle α is different and wave beam deflection angle γ is different.The corresponding zenith angle θ of the point and turntable azimuth φ1It is identical,
But the whether identical problem as in this patent of corresponding RCS under the conditions of two kinds.
In Fig. 3, as feature attitude angle θ, after φ is determined, the orientation of radar illumination aircraft uniquely determines.As long as radar
Polarized state HH/VV determine after, the RCS of radar surveying is exactly unique.When carrying out rcs measurement, either using two
One loop wheel machine structure make target generate rotation or by wave beam deflect change zenith angle θ be all adjustment aircraft and radar ray it
Between relationship.During the adjustment, the polarized state of radar wave does not change.Therefore the RCS of the coincidence point in overlay region
Must be unique.
When carrying out joint test according to Fig. 8,9 measurements for removing γ=0 are outer also：1. α=- 20 °, the one of γ=10 °
Secondary measurement；2. α=20 °, the one-shot measurement of γ=10 °；3. α=- 20 °, the one-shot measurement of γ=5 °；4. α=20 °, γ=5 °
One-shot measurement.13 measurements altogether, workload increase by 44%.
Operating instruction can arrange the content measured and rational aggregation of data according to the requirement of data distribution.
Claims (5)
1. a kind of rcs measurement method based on wave beam deflection, in two one are hung support system, one-dimensional turntable is in pitch rotation machine
For structure in the following, turntable table top is parallel to the ground, turntable rotary shaft z is perpendicular to the ground；Two struts are fixed on turntable, and with turning
Platform table top is vertical, and two struts are realized with aircraft in point (b) and point (c) and are mechanically connected；The lifting rope and aircraft for being fixed on roof are carried on the back
(a) point connection in portion, lifting rope overlaps with turret axis, by (a), (b), 3 points of (c) by aircraft fixation in the air；By adjusting
The length of lifting rope changes aircraft pitch angle α；Turntable rotation drives aircraft to realize azimuth of target φ variations, carries out the RCS of target
It measures；It is characterized in that：In described two one rcs measurements for hanging progress target in support system, pass through compact feed phase
Centrical defocusing design, makes electromagnetism wave ray generate wave beam deflection angle γ with turntable rotary shaft z, by adjusting electromagnetism wave ray
With the wave beam deflection angle γ, aircraft pitch angle α, turntable azimuth φ of turntable rotary shaft z1Realize big circular scan or conical scanning.
2. the rcs measurement method according to claim 1 based on wave beam deflection, it is characterised in that：When electromagnetism wave ray with
When turntable rotary shaft z is vertical, wave beam deflection angle γ=0 ° of electromagnetism wave ray and turntable rotary shaft z is bowed for different aircrafts
Angle of elevation alpha, turntable rotation, changes turntable azimuth φ1Realize big circular scan.
3. the rcs measurement method according to claim 1 based on wave beam deflection, it is characterised in that：When aircraft pitch angle α=
0 °, for different wave beam deflection angle γ, turntable rotation changes turntable azimuth φ1Realize conical scanning.
4. a kind of rcs measurement system based on wave beam deflection, in two one are hung support system, one-dimensional turntable is in pitch rotation machine
For structure in the following, turntable table top is parallel to the ground, turntable rotary shaft z is perpendicular to the ground；Two struts are fixed on turntable, and with turning
Platform table top is vertical, and two struts are realized with aircraft in point (b) and point (c) and are mechanically connected；The lifting rope and aircraft for being fixed on roof are carried on the back
(a) point connection in portion, lifting rope are overlapped with turret axis, are fixed aircraft in the air for 3 points by a, b, c；By adjusting lifting rope
Length changes aircraft pitch angle α；Turntable rotation drives aircraft to realize that azimuth of target φ variations carry out the rcs measurement of target；Its
It is characterized in that：The rcs measurement system further includes the defocusing module of compact feed phase center, by mechanical arm perpendicular to feed
Direction of illumination translates the position of feed, makes compact feed phase center off-focal, so as to which electromagnetism wave ray be made to be revolved with turntable
Shaft z generates wave beam deflection angle γ, by adjusting electromagnetism wave ray and wave beam deflection angle γ, the aircraft pitch of turntable rotary shaft z
Angle α, turntable azimuth φ1Realize big circular scan or conical scanning.
5. the rcs measurement system according to claim 4 based on wave beam deflection, it is characterised in that：Aircraft pitch angle α changes
With turntable azimuth φ1Change and transverse component is generated at the spherical linkage that can be all connect in strut with aircraft；Aircraft pitch angle α becomes
During change, the component is along fuselage front-rear direction；Turntable azimuth φ1During variation, the component is along fuselage left and right directions；It is in the front-back direction
Component is equal, and the component of left and right directions is also equal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109581314A (en) * | 2018-12-14 | 2019-04-05 | 中国航空工业集团公司北京航空精密机械研究所 | The device of aircraft RCS test |
| CN111912453A (en) * | 2020-06-15 | 2020-11-10 | 成都飞机工业（集团）有限责任公司 | Device for simultaneously obtaining target three-dimensional moment and angle for RCS test |
| CN113063991A (en) * | 2021-03-15 | 2021-07-02 | 北京环境特性研究所 | Method and device for detecting compact field polarization deflection angle |
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