CN112363128A - Radar mark target device - Google Patents
Radar mark target device Download PDFInfo
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- CN112363128A CN112363128A CN202011165278.6A CN202011165278A CN112363128A CN 112363128 A CN112363128 A CN 112363128A CN 202011165278 A CN202011165278 A CN 202011165278A CN 112363128 A CN112363128 A CN 112363128A
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- radar
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to a radar target device, comprising: a connecting rod for fixing to a bridge; the target head is arranged at the bottom of the connecting rod and comprises a plurality of reflecting plates, the reflecting plates are perpendicular to each other and are connected to the same vertex, and the reflecting plates are square plates with cut corners. The invention relates to a radar target device, which can enable electromagnetic waves emitted by a radar to pass through any two reflecting plates and return to the original direction no matter the electromagnetic waves are incident from any angle, so that the measurement precision of the radar is extremely high; and because the reflecting plate is a square plate with a corner cut, the echo signal intensity is higher, and the echo stability is better, so that the echo signal can be improved, and the measuring precision of the radar is improved.
Description
Technical Field
The invention relates to the technical field of engineering measurement, in particular to a radar target device.
Background
In recent years, deformation measurement radars are widely applied to the aspects of road, tunnel and bridge construction, detection and maintenance and the like. In particular, in the field of bridges, suspension bridges and cable-stayed bridges have been developed and constructed rapidly in China since the 20 th century, and such bridges have large span and flexible characteristics, so that monitoring of flexible structures and dynamic characteristics of such bridges is a problem of great concern to technicians at present.
In the related technology, the deformation measurement radar is a product based on high-resolution radar remote sensing imaging and phase interferometry, takes electromagnetic waves as media to perform real-time, dynamic and non-contact measurement on micro deformation of targets such as bridges, high-rise buildings, iron towers, tunnels and the like, can be widely applied to measurement of static deflection, dynamic deflection, cable-stayed bridge cable force and the like, and has the advantages of high measurement precision, high data updating rate, simultaneous multipoint measurement, convenience and quickness in installation and deployment, low comprehensive use cost and the like. The flexible structure and dynamic characteristics of the bridge can be monitored generally by a deformation measuring radar.
However, the echo signals are affected by a large number of interference factors when the radar detects the deformation of the bridge, so that the echo signals are weak, and the measurement accuracy is affected.
Therefore, it is necessary to design a radar target device to improve the measurement accuracy of the radar.
Disclosure of Invention
The embodiment of the invention provides a radar target device, which aims to solve the problems that in the related art, when a radar carries out deformation detection on a bridge, the echo signal is influenced by more interference factors, the echo signal is weaker, and the measurement precision is influenced.
In a first aspect, there is provided a radar target apparatus comprising: a connecting rod for fixing to a bridge; the target head is arranged at the bottom of the connecting rod and comprises a plurality of reflecting plates, the reflecting plates are perpendicular to each other and are connected to the same vertex, and the reflecting plates are square plates with cut corners.
In some embodiments, the chamfer is located at a corner of the reflector plate that is distant from each other.
In some embodiments, the cut angle is formed by cutting along a line connecting the midpoints of two adjacent sides of the square plate.
In some embodiments, a damping ball joint is disposed between the target head and the connecting rod, and the target head is connected to the damping ball joint and rotates in any direction through the damping ball joint.
In some embodiments, a fixing bottom plate is fixed at the bottom of the connecting rod, and the damping ball hinge is fixed with the connecting rod through the fixing bottom plate.
In some embodiments, the damping ball joint includes a connecting seat and a cylinder connected to the connecting seat, the connecting seat is fixed to the fixing base plate by a bolt, the damping ball joint further includes a ball head accommodated in the cylinder, the ball head is rotatable relative to the cylinder, and the target head is fixed to the ball head.
In some embodiments, a stud is fixed at an apex where the reflective plates are connected with each other, the ball head has a first threaded hole matched with the stud, and the target head is fixed with the ball head through the stud.
In some embodiments, the damping ball joint further includes a locking bolt penetrating through one side of the column, and the ball head is locked by screwing the locking bolt into the ball head.
In some embodiments, a top fixing plate is arranged at the top of the connecting rod, and the top fixing plate is provided with a second threaded hole which penetrates through the top and the bottom and is used for fixing the connecting rod to the beam bottom plate through a bolt.
In some embodiments, the radar target device may further include a plurality of fixing pads sleeved on the connecting rod, the fixing pads are located below the fixing top plate, and the fixing pads have a semi-circular notch for accommodating the connecting rod.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a radar target device, which is characterized in that the radar target device is provided with a plurality of reflecting plates which are vertically arranged, after the radar target device is arranged at the fixed point position of a bridge bottom plate, when the radar is used for carrying out deformation detection on the fixed point position of the bottom of a beam, electromagnetic waves emitted by the radar can return to the fixed point position along the original direction through any two reflecting plates no matter the electromagnetic waves are incident from any angle, so that the measurement precision of the radar is extremely high; and because the reflecting plate is a square plate with a corner cut, the echo signal intensity is higher and the echo stability is better after experimental verification, so that the echo signal can be improved by additionally arranging the radar target device, and the measurement precision of the radar is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic perspective exploded view of a radar target device according to an embodiment of the present invention;
fig. 2 is a schematic view of an assembly structure of a radar target device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a damping ball hinge of a radar target apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a radar target device mounted to a bridge according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a radar target device according to an embodiment of the present invention after a target head is rotated;
fig. 6 is a schematic structural diagram of a bridge provided with a plurality of radar target devices according to an embodiment of the present invention.
In the figure: 100. a radar target device; 1. a connecting rod; 11. fixing the bottom plate; 12. fixing a top plate; 2. a target head; 21. a reflective plate; 22. a stud; 3. damping ball hinge; 31. a connecting seat; 32. a cylinder; 33. a ball head; 331. a first threaded hole; 34. locking the bolt; 4. fixing a gasket; 41. a notch; 200. a beam bottom plate; 300. a bridge pier; 400. a radar.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention provides a radar target device, which can solve the problems that in the related art, when a radar carries out deformation detection on a bridge, the echo signal is influenced by more interference factors, the echo signal is weaker, and the measurement precision is influenced.
Referring to fig. 1 and 2, a radar target apparatus 100 according to an embodiment of the present invention may include: a connecting rod 1 for fixing to a bridge; target head 2, can install in the bottom of connecting rod 1, and target head 2 can include a plurality of reflecting plates 21, reflecting plate 21 can be mutually perpendicular set up and connect in same summit, in this embodiment, target head 2 has three reflecting plate 21, three reflecting plate 21 welded fastening each other, and reflecting plate 21 can be the square board that has the corner cut, that is to say, each reflecting plate 21 is through one of them corner formation of square board excision, can guarantee that every reflecting plate 21 has great plane of reflection, also can reach the higher echo signal of intensity.
Referring to fig. 1 and 4, preferably, the rear surface of the target head 2 is a vertex formed by connecting three reflecting plates 21, the vertex is the focusing position of the target head 2 in the radar 400, the front surface of the target head 2 forms an opening facing the observation station of the radar 400, the effective visual angle of the opening is about 90 degrees, the effective visual angle has good tolerance to the angle error of the pointing radar 400, and the effect is best when the direction of the opening is pointed to the radar 400.
Referring to fig. 1 and 2, in some embodiments, the connecting rod 1 may be a long cylindrical rod, the beam bottom plate 200 may have a mounting hole in a vertical direction (i.e., up and down direction), and the connecting rod 1 may vertically pass through the mounting hole and be fixed in the mounting hole.
Referring to fig. 1 and 2, in some alternative embodiments, the cut angle may be located at a corner where the reflective plates 21 are far away from each other, that is, at a corner where the reflective plates 21 are not connected to each other, so that after three reflective plates 21 are welded together, the length of the edge where any two adjacent reflective plates 21 are connected is the same.
Referring to fig. 1, in some embodiments, the cut angle may be formed by cutting along a connecting line between midpoints of two adjacent sides of the square plate, that is, the cut portion is an isosceles right triangle having a side length half that of the square plate, and the reflection plate 21 is calculated to cut off a portion of the external angle along the midpoint of the side length, which improves the scattering quality better than other conventional square plates (i.e., square plates without cutting any external angle), triangular plates, and the like; preferably, the reflecting plate 21 can be made of an aluminum alloy material, the aluminum alloy material is light and easy to process, and the reflecting plate 21 made of the aluminum alloy material has strong signal reflecting capacity and strong antirust and anticorrosion capacity.
Referring to fig. 1 and 3, in some optional embodiments, a damping ball hinge 3 may be disposed between the target head 2 and the connecting rod 1, the target head 2 may be connected to the damping ball hinge 3, and the target head 2 may rotate in any direction through the damping ball hinge 3, and due to the arrangement of the damping ball hinge 3, angle adjustment of the target head 2 in any direction may be achieved through a simple structure, so that the target head 2 may find the position of the radar 400 source more easily, thereby achieving signal echo; because the height of different positions of the beam bottom is different, the included angles between different positions and the same radar 400 are also different, so that the angles of received signals are different, the direction of the target head 2 can be adjusted more conveniently and rapidly through the damping spherical hinge 3, and the opening orientation of the target head 2 is aligned to the radar 400.
Referring to fig. 1 and 5, in some embodiments, a fixing base plate 11 may be fixed to the bottom of the connecting rod 1, and the damping ball hinge 3 may be fixed to the connecting rod 1 through the fixing base plate 11, specifically, the fixing base plate 11 may be fixed to the connecting rod 1 in a welding manner, or fixed to the connecting rod 1 through a bolt, and compared with the damping ball hinge 3 directly fixed to the connecting rod 1, by additionally providing the fixing base plate 11, the contact surface between the damping ball hinge 3 and the fixing base plate 11 may be flat and have a large contact area, so that the damping ball hinge 3 is fixed more firmly.
Referring to fig. 1 and 3, preferably, the damping ball hinge 3 may include a connecting seat 31 and a column 32 connected to the connecting seat 31, the connecting seat 31 may be fixed to the fixing base plate 11 by bolts, the connecting seat 31 is disposed to make the connecting seat 31 and the fixing base plate 11 in plane-to-plane contact, the stability of the damping ball hinge 3 is good, and the damping ball hinge 3 is also easily detached from the fixing base plate 11 by the bolts, in other embodiments, the connecting seat 31 may be directly welded to the fixing base plate 11; the damping ball joint 3 can further comprise a ball head 33 contained in the column 32, the ball head 33 can rotate relative to the column 32, the target head 2 is fixed with the ball head 33, specifically, a cavity containing the ball head 33 can be formed in the column 32, the ball head 33 can rotate in any direction in the cavity, and the target head 2 can rotate in any direction along with the ball head 33 by fixing the target head 2 and the ball head 33.
Referring to fig. 4, 5 and 6, in some embodiments, a stud 22 may be fixed at a vertex where a plurality of reflective plates 21 are connected to each other, the ball head 33 may have a first threaded hole 331 for mating with the stud 22, the target head 2 is screwed into the first threaded hole 331 through the stud 22 to be fixed with the ball head 33, the stud 22 may drive the reflective plates 21 to rotate by rotating the ball head 33, and the stud 22 and the bottom surface of the connecting seat 31 may have a first included angle θ1The line connecting the radar 400 and the target head 2 may have a second angle θ with the horizontal plane2When the direction of the target head 2 is adjusted, the first angle θ can be controlled1At a second angle theta2The angles of the reflecting plate 21 are the same, so that the reflecting plate 21 can accurately receive electromagnetic wave signals; in the time of in-service use, can install radar 400 on pier 300, install radar mark target device 100 at the beam bottom plate 200 of bridge, and radar 400 is located the below of beam bottom plate 200, each bridge can be equipped with two at least piers 300, can be equipped with a plurality of radar mark target devices 100 between two adjacent piers 300, and according to the thickness of beam bottom plate 200, can design into different length with connecting rod 1 of a plurality of radar mark target devices 100, and through adjusting radar mark target device 1 that is located intermediate position between two adjacent piers 300First included angle theta of 001At a second angle theta2The angles of the two adjacent piers 300 are the same, the target heads 2 of the radar target devices 100 at other positions are ensured to be within the receiving range of the radar 400, one-time multipoint measurement is realized, the measurement efficiency is improved, and the data correlation is better.
Referring to fig. 3 and 5, in some optional embodiments, the damping ball hinge 3 may further include a locking bolt 34 penetrating through one side of the column 32, and after the target head 2 rotates to a set position, the locking bolt 34 may be screwed into the ball 33 to lock the ball 33, and the ball 33 and the column 32 may be relatively fixed, so that the target head 2 is fixed at a preset angle, and the target head 2 can be used in a severe weather environment after being fastened, and is not easily affected by changing the angle.
Referring to fig. 1 and 2, in some embodiments, a top of the connecting rod 1 may be provided with a fixed top plate 12, the fixed top plate 12 may be circular, the fixed top plate 12 may be provided with a second threaded hole penetrating up and down along a circumference thereof, the second threaded hole may be used to fix the connecting rod 1 to a beam bottom plate 200 of a bridge through a bolt, specifically, the fixed top plate 12 may be fixed to the connecting rod 1 by welding, and the bolt may penetrate through the second threaded hole to press the beam bottom plate 200, so as to fix the connecting rod 1 to the beam bottom plate 200.
Referring to fig. 1 and 2, in some optional embodiments, the radar target apparatus 100 may further include a plurality of fixing pads 4 sleeved on the connecting rod 1, the fixing pads 4 may be located below the fixing top plate 12, and the fixing pads 4 may have a semi-circular notch 41 for accommodating the connecting rod 1, that is, the fixing pads 4 together form a complete circular ring, and are sleeved outside the connecting rod 1, and the fixing pads 4 may be located between the fixing top plate 12 and the beam bottom plate 200, so that the bolt passing through the second threaded hole abuts against the surface of the fixing pads 4, and the connecting rod 1 can be stably installed at the bottom of the beam under the condition of insufficient space.
Referring to fig. 1 and 2, preferably, in this embodiment, two sets of fixing pads 4 are disposed on the connecting rod 1 in an up-down overlapping manner, each set of fixing pads 4 is provided with two sets, and the two sets of fixing pads 4 are vertically arranged in a staggered manner, that is, the two fixing pads 4 on the upper layer are assembled along a first direction, the two fixing pads 4 on the lower layer are assembled along a second direction, the first direction is perpendicular to the second direction, and the two layers of vertically arranged pads are adopted to achieve more balanced stress after being screwed compared with the pad only arranged on one layer, so that the stability is stronger.
Referring to fig. 1 and 4, when the radar target device 100 is used specifically, firstly, the target head 2, the damping ball hinge 3, the fixing bottom plate 11 and the fixing top plate 12 are all installed on the ground to the connecting rod 1 to form an assembly part, a rope is placed on the ground from an installation hole of the beam bottom plate 200 and is bound with a top circular hole of the connecting rod 1, the assembled assembly part is pulled up to the installation hole of the beam bottom plate 200 through the rope, then two groups of fixing gaskets 4 are installed on the connecting rod 1 below the fixing top plate 12, then the orientation of the target head 2 is adjusted, the fixing top plate 12 is fastened on the beam bottom plate 200 through bolts, and finally, the rope penetrates through the top circular hole of the connecting rod 1 and is bound with the beam bottom plate 200 to increase safety.
The principle of the radar target device provided by the embodiment of the invention is as follows:
because the radar target device 100 is provided with the plurality of reflecting plates 21 which are vertically arranged, after the radar target device 100 is installed at the fixed point position of the bridge beam bottom plate 200, when the radar 400 is used for deformation detection of the fixed point position of the beam bottom, electromagnetic waves emitted by the radar 400 can return to the fixed point position along the original direction through any two reflecting plates 21 no matter the electromagnetic waves are incident from any angle, so that the measurement precision of the radar 400 is extremely high, and the radar target device 100 to be detected can be ensured to be irradiated by the electromagnetic waves of the radar 400 with acceptable uniform amplitude and phase; in addition, since the reflecting plate 21 is a square plate with a cut angle, the echo signal strength is high and the echo stability is good through experimental verification, so that the echo signal can be improved by additionally arranging the radar target device 100, and the measurement accuracy of the radar 400 is improved; meanwhile, if the radar 400 directly enters the bridge deck, the amplitude of the recovered echo signal is too large or too small, more burrs are displayed on the curve of the deformed waveform signal, and the waveform of the echo signal is more stable and the burrs are less by using the radar target device 100.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A radar target apparatus, comprising:
a connecting rod (1) for fixing to a bridge;
target head (2), install in the bottom of connecting rod (1), target head (2) include a plurality of reflecting plates (21), reflecting plate (21) mutually perpendicular set up and connect in same summit, and reflecting plate (21) are the square board that has the corner cut.
2. The radar target apparatus of claim 1 wherein:
the chamfer is located at a corner of the reflective plate (21) that is distant from each other.
3. The radar target apparatus of claim 2, wherein:
the cutting angle is formed by cutting along the connecting line of the midpoints of two adjacent sides of the square plate.
4. The radar target apparatus of claim 1 wherein:
target head (2) with be equipped with damping ball pivot (3) between connecting rod (1), target head (2) connect in damping ball pivot (3), and pass through damping ball pivot (3) realize the rotation of arbitrary direction.
5. The radar target apparatus of claim 4 wherein:
the damping ball joint is characterized in that a fixed bottom plate (11) is fixed to the bottom of the connecting rod (1), and the damping ball joint (3) is fixed to the connecting rod (1) through the fixed bottom plate (11).
6. The radar target apparatus of claim 5 wherein:
the damping spherical hinge (3) comprises a connecting seat (31) and a column body (32) connected to the connecting seat (31), the connecting seat (31) is fixed with the fixed bottom plate (11) through a bolt,
damping ball pivot (3) still including accept in bulb (33) in cylinder (32), bulb (33) can for cylinder (32) rotate, target head (2) with bulb (33) are fixed.
7. The radar target apparatus of claim 6, wherein:
a stud (22) is fixed at the top point where the reflecting plates (21) are connected with each other, the ball head (33) is provided with a first threaded hole (331) matched with the stud (22), and the target head (2) is fixed with the ball head (33) through the stud (22).
8. The radar target apparatus of claim 6, wherein:
the damping ball joint (3) further comprises a locking bolt (34) penetrating through one side of the column body (32), and the ball head (33) is locked by screwing the locking bolt (34) into the ball head (33).
9. The radar target apparatus of claim 1 wherein:
the top of the connecting rod (1) is provided with a fixed top plate (12), the fixed top plate (12) is provided with a second threaded hole which penetrates through the fixed top plate from top to bottom, and the second threaded hole is used for fixing the connecting rod (1) to the beam bottom plate (200) through a bolt.
10. The radar target apparatus of claim 9, wherein:
the radar target device (100) further comprises a plurality of fixing gaskets (4) sleeved on the connecting rod (1), wherein the fixing gaskets (4) are located below the fixing top plate (12), and the fixing gaskets (4) are provided with semi-circular-arc-shaped gaps (41) for accommodating the connecting rod (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011165278.6A CN112363128B (en) | 2020-10-27 | 2020-10-27 | Radar target device |
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| CN202011165278.6A CN112363128B (en) | 2020-10-27 | 2020-10-27 | Radar target device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900085A (en) * | 2021-09-22 | 2022-01-07 | 张海杨 | Radio directional receiving reflectometer capable of receiving signals from multiple directions |
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