CN111562550A - Passive dihedral angle external calibrator - Google Patents
Passive dihedral angle external calibrator Download PDFInfo
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- CN111562550A CN111562550A CN202010295851.9A CN202010295851A CN111562550A CN 111562550 A CN111562550 A CN 111562550A CN 202010295851 A CN202010295851 A CN 202010295851A CN 111562550 A CN111562550 A CN 111562550A
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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
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Abstract
The invention discloses a passive dihedral angle external calibrator which can improve the continuity and accuracy of pitch angle adjustment and can be quickly adjusted to a specific attitude angle. The method comprises the following steps: the device comprises a dihedral angle reflecting surface, a dihedral angle reflecting surface bracket, an omnidirectional adjusting device, a base, a connecting rod and a sliding adjusting device, wherein the dihedral angle reflecting surface is fixed on the dihedral angle reflecting surface bracket, and the omnidirectional adjusting device is movably connected with the base; the omnidirectional adjusting device comprises an installation shaft and a shaft sleeve; the dihedral angle reflecting surface bracket is fixed at the first end of the mounting shaft and rotates along the axial direction of the mounting shaft; the base comprises two vertical supporting frames and a rotating shaft; the shaft sleeve is connected with the vertical support frames through a rotating shaft between the two vertical support frames so as to rotate along the axial direction of the rotating shaft; one end of the connecting rod is hinged with the shaft sleeve, the other end of the connecting rod is connected with the sliding adjusting device, and the sliding adjusting device is connected to the vertical supporting frame; and the sliding adjusting device is used for driving the connecting rod to complete the pitch angle adjustment of the dihedral angle reflecting surface by the longitudinal movement along the vertical supporting frame.
Description
Technical Field
The invention relates to a calibration technology of a synthetic aperture radar, in particular to a passive dihedral angle external calibrator.
Background
The polarization external scaler of the synthetic aperture radar comprises an active scaler and a passive scaler, wherein the active scaler has wide application range and high scaling precision, but has relatively high cost and needs power supply; the passive calibrator mainly depends on a ground reflector to reflect radar waves to realize calibration, and is an effective combination of pure mechanical workpieces; the passive scaler has higher requirements on the processing and design of the reflector and relatively lower manufacturing cost; the passive calibrator can be arranged in the field, does not need electric power, has lighter weight, is convenient to carry, has lower requirements on arrangement personnel, can be used for multiple times by arranging the passive calibrator at one time, can adapt to high and low temperature and general weather environments such as wind and rain, and can be unattended. However, the existing passive scaler is slow in adjustment speed, complex in adjustment steps, time-consuming and labor-consuming to calculate angles on site.
Disclosure of Invention
The embodiment of the invention provides a passive dihedral angle external scaler which can improve the continuity and accuracy of pitch angle adjustment.
The technical scheme of the invention is realized as follows:
the embodiment of the invention provides a passive dihedral angle external scaler, which comprises: the device comprises a dihedral angle reflecting surface, a dihedral angle reflecting surface bracket, an omnidirectional adjusting device, a base, a connecting rod and a sliding adjusting device, wherein the dihedral angle reflecting surface is fixed on the dihedral angle reflecting surface bracket, and the omnidirectional adjusting device is movably connected with the base; the omnidirectional adjusting device comprises an installation shaft and a shaft sleeve; the dihedral angle reflecting surface bracket is fixed at the first end of the mounting shaft and rotates along the axial direction of the mounting shaft;
the base comprises two vertical supporting frames and a rotating shaft; wherein,
the shaft sleeve is arranged between the two vertical support frames and is connected with the vertical support frames through a rotating shaft between the two vertical support frames so as to rotate along the axial direction of the rotating shaft;
one end of the connecting rod is hinged with the shaft sleeve, the other end of the connecting rod is connected with the sliding adjusting device, and the sliding adjusting device is connected to the vertical supporting frame;
and the sliding adjusting device is used for driving the connecting rod through longitudinal movement along the vertical supporting frame to complete the pitch angle adjustment of the dihedral angle reflecting surface.
In the above aspect, the slide adjusting device includes: the vertical support frame further comprises a sliding groove, and the other end of the connecting rod is connected with the sliding shaft; the sliding shaft is fixedly connected with the gear; a rack is fixed on the outer side of the vertical support frame; the gear is meshed with the rack; the shaking adjusting handle is connected with the gear; wherein,
the sliding shaft can slide in the sliding groove in the longitudinal direction of the vertical support frame;
the outer shaft is sleeved outside the sliding shaft, is in clearance fit with the sliding shaft and is used for enabling the outer shaft to freely rotate on the sliding shaft; and the rocking adjusting handle is used for driving the gear to move on the rack, so that the connecting rod is driven to move through the movement of the gear, and the pitch angle adjustment of the dihedral angle reflecting surface is completed.
In the scheme, a dial is fixed on the shaft sleeve, at least two first mounting holes are formed in the dial, and a preset angle is formed between the at least two first mounting holes at intervals; a scale plate parallel to the dial is fixed on the mounting shaft, and a second mounting hole is formed in the scale plate; the at least two first mounting holes are matched and aligned with the second mounting holes so as to adjust the attitude angle of the dihedral angle reflecting surface.
In the above scheme, the first end of the mounting shaft is the end protruding outside the shaft sleeve;
the scale sheet is nested on the first end of the mounting shaft; the first end of the mounting shaft is close to one end of the dihedral angle reflecting surface bracket;
the dial is nested on the shaft sleeve close to the first end of the mounting shaft and is relatively parallel to the scale plate;
the installation axle is in the axle sleeve internal rotation drives dihedral angle plane of reflection with the scale piece rotates, works as the scale piece the second mounting hole rotate with when the first mounting hole of arbitrary one in at least two first mounting holes of calibrated scale aligns, will dihedral angle plane of reflection adjusts corresponding preset attitude angle.
In the above scheme, the at least two first mounting holes are uniformly distributed on the circumferential edge of the dial plate;
the second mounting holes are positioned close to the edge of the scale plate and are equidistant from the at least two first mounting holes in the radial direction;
a preset angle at an interval between the at least two first mounting holes is a non-zero minimum preset attitude angle in the at least one preset attitude angle; the dihedral corner reflectors may operate at the at least one preset attitude angle.
In the scheme, a pitching quick lock nut is arranged between the sliding shaft and the sliding groove and used for fixing the sliding shaft on the sliding groove.
In the above scheme, the base still includes the base mounting panel, base mounting panel and vertical support frame fixed connection, install the regulation lower margin under the base mounting panel, it is horizontal to adjust the lower margin and be used for the quick adjustment.
In the scheme, more than one locking screw is arranged on the shaft sleeve, the locking screw is locked into the shaft sleeve from outside to inside through the screw hole in the shaft sleeve, and the mounting shaft is fixed through the friction force between the front end of the locking screw and the mounting shaft.
In the above scheme, the second end of the installation shaft is provided with threads, the locking nut is sleeved at the second end of the installation shaft through the threads, and the locking nut is screwed to enable the locking nut to be tightly attached to the shaft sleeve to fix the installation shaft.
In the above-mentioned scheme, the dihedral corner reflecting surface mount includes: the reflecting surface right-angle fixing piece is arranged on the intersection line of a first reflecting surface and a second reflecting surface of the dihedral angle reflecting surface, and the side edge supporting pieces are arranged on two sides of the first reflecting surface and the second reflecting surface; the dihedral angle reflecting surface bracket also comprises more than one reflecting plate inclined strut; wherein,
the reflecting plate inclined supports are arranged on two sides of the dihedral reflecting surface support, and two ends of each reflecting plate inclined support are fixedly connected to the first reflecting surface side edge support and the second reflecting surface side edge support which are located on the same side respectively.
The passive dihedral angle external scaler provided by the embodiment of the invention comprises: the device comprises a dihedral angle reflecting surface, a dihedral angle reflecting surface bracket, an omnidirectional adjusting device, a base, a connecting rod and a sliding adjusting device, wherein the dihedral angle reflecting surface is fixed on the dihedral angle reflecting surface bracket, and the omnidirectional adjusting device is movably connected with the base; the omnidirectional adjusting device comprises an installation shaft and a shaft sleeve; the dihedral angle reflecting surface bracket is fixed at the first end of the mounting shaft and rotates along the axial direction of the mounting shaft; the base comprises two vertical supporting frames and a rotating shaft; the shaft sleeve is arranged between the two vertical support frames and is connected with the vertical support frames through a rotating shaft between the two vertical support frames so as to rotate along the axial direction of the rotating shaft; one end of the connecting rod is hinged with the shaft sleeve, the other end of the connecting rod is connected with the sliding adjusting device, and the sliding adjusting device is connected to the vertical supporting frame; and the sliding adjusting device is used for driving the connecting rod to complete the pitch angle adjustment of the dihedral angle reflecting surface by the longitudinal movement along the vertical supporting frame. By adopting the scheme, the connecting rod can be driven by the sliding adjusting device to adjust the pitch angle, and the modulus of the gear is smaller when the sliding adjusting device is adopted to adjust through sliding, so that the step angle of the movement of the connecting rod is smaller, and the continuity and accuracy of the adjustment of the pitch angle are improved.
Drawings
Fig. 1 is a schematic structural diagram of a passive dihedral angle external scaler according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure of a dihedral corner reflector according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of the omnidirectional adjusting device, the sliding adjusting device, the connecting rod and the base;
fig. 4(a) is a schematic diagram of a first pitch angle adjustment provided by an embodiment of the present invention;
fig. 4(b) is a schematic diagram of pitch angle adjustment provided in the embodiment of the present invention;
fig. 4(c) is a schematic diagram of pitch angle adjustment provided by the embodiment of the present invention;
fig. 4(d) is a schematic diagram of pitch angle adjustment provided by the embodiment of the present invention;
FIG. 5(a) is a first example of the relative positions of the azimuth angle-specific quick adjustment dial and the scale plate according to the embodiment of the present invention;
FIG. 5(b) is a second example of the relative positions of the azimuth angle-specific quick adjustment dial and the scale plate according to the embodiment of the present invention;
FIG. 5(c) is a third exemplary illustration of the relative positions of the azimuth angle-specific quick adjustment dial and the scale plate according to the embodiment of the present invention;
fig. 6 is a schematic diagram of a component structure of a mounting shaft locking device of the omnidirectional adjusting device provided by the embodiment of the invention;
fig. 7 is a first schematic structural diagram illustrating a base of a passive dihedral angle external scaler according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a base of the passive dihedral angle external scaler according to the embodiment of the present invention;
FIG. 9 is a schematic view of a support bolt according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a dihedral corner reflector holder according to an embodiment of the present invention;
FIG. 11 is a schematic view of an assembly structure of the reflection plate diagonal brace and the measurement mounting bracket according to an embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a measurement mount according to an embodiment of the present invention;
fig. 13(a) is a schematic view of an assembly structure of an omnidirectional adjustment device and a dihedral corner reflector bracket according to an embodiment of the present invention;
fig. 13(b) is a schematic diagram of an assembly structure of an omnidirectional adjustment device and a dihedral corner reflector bracket according to an embodiment of the present invention;
FIG. 14 is a schematic diagram of a connection device of a passive dihedral external scaler according to an embodiment of the present invention;
FIG. 15 is a schematic view of a ground nail structure provided in the embodiments of the present invention;
FIG. 16 is a schematic view of a course adjustment provided in accordance with an embodiment of the present invention;
fig. 17(a) is a schematic view of a first pitch adjustment provided in an embodiment of the present invention;
fig. 17(b) is a schematic diagram of pitch adjustment provided in the embodiment of the present invention;
FIG. 18 is a schematic view of an attitude angle adjustment provided by an embodiment of the present invention;
fig. 19 is a schematic diagram of a result of adjusting the attitude rotation angle of the compass theodolite according to the embodiment of the present invention.
Detailed Description
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.
In an embodiment of the present invention, the passive dihedral angle external scaler includes: the omnidirectional adjusting device comprises a dihedral angle reflecting surface, a dihedral angle reflecting surface bracket, an omnidirectional adjusting device and a base, wherein the dihedral angle reflecting surface is fixed on the dihedral angle reflecting surface bracket, and the omnidirectional adjusting device is movably connected with the base; the omnidirectional adjusting device comprises an installation shaft and a shaft sleeve; the dihedral angle reflecting surface bracket is fixed at the first end of the mounting shaft and rotates along the axial direction of the mounting shaft; the base comprises two vertical supporting frames and a rotating shaft; the shaft sleeve is arranged between the two vertical support frames and is connected with the vertical support frames through a rotating shaft between the two vertical support frames so as to rotate along the axial direction of the rotating shaft; one end of the connecting rod is hinged with the shaft sleeve, the other end of the connecting rod is connected with the sliding adjusting device, and the sliding adjusting device is connected to the vertical supporting frame; and the sliding adjusting device is used for driving the connecting rod to complete the pitch angle adjustment of the dihedral angle reflecting surface by the longitudinal movement along the vertical supporting frame.
The present invention will be described in further detail with reference to examples.
As shown in fig. 1, the passive dihedral angle external scaler provided by the embodiment of the present invention includes: the device comprises a dihedral angle reflecting surface 1, a dihedral angle reflecting surface support 2, an omnidirectional adjusting device 3, a base 4, a connecting rod 19 and a sliding adjusting device 37, wherein the dihedral angle reflecting surface 1 is fixed on the dihedral angle reflecting surface support 2; the omnidirectional adjusting device 3 is movably connected with the base 4.
In the embodiment of the present invention, as shown in fig. 2, the dihedral corner reflector 1 is composed of two perpendicular rectangular metal plates, and in practical applications, the size of the dihedral corner reflector 1 may be 50cmX50cm or 60cmX60 cm; in order to realize the reflected polarization of the radar wave, the reflecting surface has a high requirement for flatness, and good perpendicularity is required to be maintained between the first reflecting surface 11 and the second reflecting surface 12. In practical application, the non-perpendicularity of the two reflecting surfaces of the dihedral-angle reflecting surface 1 is less than 0.2 °.
In the embodiment of the present invention, the dihedral corner reflector bracket 2 includes a fixing member for fixing an angle between the first reflecting surface 11 and the second reflecting surface 12 of the dihedral corner reflector 1; and a support member for supporting a side surface of a right-angle reflecting surface formed by the first reflecting surface and the second reflecting surface 12, the dihedral angle reflecting surface bracket 2 may fix the dihedral angle reflecting surface 1 to the omnidirectional adjustment device 3 by the fixing member, or may fix the dihedral angle reflecting surface 1 to the omnidirectional adjustment device 3 by a separate connecting member.
In the embodiment of the present invention, as shown in fig. 1, the dihedral angle reflector bracket 2 is fixed at the first end 10 of the mounting shaft 5 in the omnidirectional adjustment device 3, and can rotate along the axial direction of the mounting shaft 5 to drive the dihedral angle reflector 1 to rotate to different attitude angles.
In the embodiment of the present invention, as shown in fig. 1, the omnidirectional adjusting apparatus 3 includes an installation shaft 5 and a shaft sleeve 6, and the base 4 further includes: two vertical supports 8 and a rotating shaft 9; the shaft sleeve 6 is arranged between the two vertical support frames 8 and is connected with the vertical support frames 8 through a rotating shaft 9, so that the shaft sleeve 6 can axially rotate along the rotating shaft 9; a link 19 is hinged to the sleeve 6 near the second end 18 of the mounting shaft 5, and the other end of the link 19 is connected to a slide adjustment device 37, so that the slide adjustment device 37 is connected to the vertical support frame 8.
In the embodiment of the present invention, the sliding adjustment device 37 can drive the connecting rod 19 by moving along the longitudinal direction of the vertical support frame 8, so that the shaft sleeve 6 and the connecting rod 19 form a crank-connecting rod slider mechanism, and the omnidirectional adjustment device 3 axially rotates along the rotating shaft 9, thereby achieving the purpose of adjusting the pitch angle of the dihedral angle reflector 1 and completing the pitch angle adjustment of the dihedral angle reflector 1.
The sliding adjustment device 37 in the embodiment of the present invention may be designed to drive the connecting rod 19 to move through the engagement motion of the gear and the rack, or drive the connecting rod 19 to move in the manners of pulling and wrenching, based on the motion principle of the crank-connecting rod slider structure, which is not limited in the embodiment of the present invention.
It can be understood that the embodiment of the invention drives the connecting rod through the sliding adjusting device to adjust the pitch angle, and the module of the gear is smaller when the sliding adjusting device is adopted to adjust through sliding, so that the step angle of the movement of the connecting rod is smaller, and the continuity and the accuracy of the pitch angle adjustment are improved.
In the embodiment of the present invention, as shown in fig. 3, the sliding adjustment device 37 may include a sliding shaft 28, an outer shaft 36, a gear 32, a rack 33, and a rocking adjustment handle 34, and the vertical support frame 8 further includes a sliding groove 29; wherein, the position of the shaft sleeve 6 close to the second end 18 of the mounting shaft 5 is hinged with a connecting rod 19, and the other end of the connecting rod 19 is connected with a sliding shaft 28; the sliding shaft 28 is fixedly connected with the gear 32; a rack 33 is longitudinally fixed on the outer side of the vertical support frame 8; the rack 33 is parallel to the sliding groove 29 and is close to the edge of the sliding groove 29, and the gear 32 is meshed with the rack 33 while the sliding shaft 28 can slide in the sliding groove 29 on the vertical supporting frame 8; the rocking adjustment handle 34 is connected to the gear 32.
In the embodiment of the present invention, the sliding shaft 28 can slide in the sliding groove 29 in the longitudinal direction of the vertical support frame 8; the sliding shaft 28 is externally sleeved with an outer shaft 36, and the outer shaft 36 is in clearance fit with the sliding shaft 28 and can freely rotate on the sliding shaft 28.
In the embodiment of the present invention, as shown in fig. 4(a), 4(b), 4(c) and 4(d), when the rocking adjustment handle 34 starts rocking, the gear 32 may be driven to move upwards or downwards on the rack 33 in a meshed manner according to the direction of the rocking adjustment handle 34, and for example, when the rocking adjustment handle 34 rocks in a clockwise direction, the gear 32 may be driven to move upwards on the rack 33; when the adjusting handle 34 is swung in a counterclockwise direction, the gear 32 is driven to move downward on the rack 33, the movement of the gear 32 can drive the sliding shaft 28 to move upward or downward, the sliding shaft 28 drives the outer shaft 36 to move upward or downward simultaneously, and further the connecting rod 19 is driven to move, so as to push the mounting shaft 5 and the shaft sleeve 6 to rotate at different angles along the rotating shaft 9. Thus, the shaft sleeve 6 and the connecting rod 19 form a crank-connecting rod slider mechanism, so that the omnidirectional adjusting device 3 axially rotates along the rotating shaft 9, and the pitch angle of the dihedral angle reflecting surface 1 is adjusted.
It can be understood that in the embodiment of the invention, the gear and the rack are meshed and combined with the crank-connecting rod sliding block structure formed by the connecting rod and the shaft sleeve, so that the gear, the rack, the sliding shaft and the outer shaft can be driven to move by swinging the adjusting handle, and the connecting rod is driven to adjust the pitch angle of the dihedral angle reflecting surface, therefore, the operation convenience for adjusting the pitch angle of the dihedral angle reflecting surface is improved, and furthermore, as the gear and the rack have smaller modulus, when the adjusting handle is swung, the step angle of the connecting rod movement is smaller, and the continuity and the accuracy of the pitch angle adjustment are improved.
In some embodiments of the present invention, a dial plate 31 is fixed on the shaft sleeve 6, and at least two first mounting holes are formed on the dial plate 31, and a preset angle is arranged between the at least two first mounting holes; wherein, at least two first mounting holes can be in fixed interval or non-fixed interval.
In some embodiments of the present invention, accordingly, the preset angle of the interval between at least two first mounting holes on the scale plate 31 may be preset as a step of the adjustment angle, illustratively, one first mounting hole every 22.5 °; or the angle value of the corresponding standard attitude angle may be directly preset according to the angle of the standard attitude angle in different working states of the dihedral angle reflecting surface 1.
In some embodiments of the present invention, as shown in fig. 5(a), a scale plate 30 parallel to the dial is fixed on the mounting shaft 5, and a second mounting hole is formed on the scale plate 30; when the dihedral angle reflecting surface is adjusted, the scale sheet 30 rotates along the axial direction of the installation shaft 5 in the shaft sleeve 6 along with the installation shaft 5, so that the second installation holes in the scale sheet 30 are aligned with at least two parallel installation holes in the dial plate 31 one by one, and the attitude angle of the dihedral angle reflecting surface 1 can be quickly adjusted.
It can be understood that in the embodiment of the invention, the omnidirectional rotation of the dihedral angle reflecting surface can be realized through the omnidirectional adjusting device, so that the passive dihedral angle external calibrator can carry out omnidirectional adjustment on various attitude angles, the omnidirectional adjustment is convenient, the dihedral angle reflecting surface can be quickly adjusted to various attitude angles through the matching alignment of the dial and the mounting hole on the scale plate, and the speed of adjusting the attitude angles is improved.
In some embodiments of the present invention, as shown in fig. 5(a), the first end 10 of the mounting shaft 5 may be the end protruding outside the bushing 6; the scale sheet 30 is nested on the first end 10 of the mounting shaft, is also positioned outside the shaft sleeve 6, and is fixed on one end of the mounting shaft 5 close to the dihedral angle reflecting surface bracket 2; in some embodiments, the initial position of the second mounting hole on the scale plate 30 is aligned with the axis of the mounting shaft 5. The dial plate 31 is fixedly nested at a position of the shaft sleeve 6 close to the first end 10 of the mounting shaft 5, is relatively parallel to the scale plate 30, and has a certain gap with the scale plate 30, so that the scale plate 30 can rotate smoothly.
In some embodiments of the invention, the dihedral corner reflectors may operate at least one preset attitude angle; therefore, the at least two first mounting holes can be fixed at preset angles at intervals and are uniformly distributed on the circumferential edge of the dial disc; the second mounting holes may be located near the edge of the scale plate and radially equidistant from the at least two first mounting holes; the preset angle at the interval between the at least two first mounting holes may be a non-zero minimum preset attitude angle in the at least one preset attitude angle.
In some embodiments, the preset angle of the interval between the at least two first mounting holes may be preset to 22.5 ° according to a normal attitude angle of the dihedral reflecting surface in operation, which is commonly used.
In the embodiment of the present invention, as shown in fig. 5(b) and 5(c), when the mounting shaft 5 rotates in the axial direction in the shaft sleeve 6, the dihedral angle reflective surface 1 and the scale plate 30 can be driven to rotate synchronously, and when the second mounting hole of the scale plate 30 rotates to align with any one of the at least two first mounting holes of the scale plate 31, it is indicated that the dihedral angle reflective surface 1 has been adjusted to the corresponding preset attitude angle. Illustratively, when the second mounting hole is at the initial position, aligned with the mounting shaft axis, the second mounting hole is aligned with the first mounting hole corresponding to 0 ° of the at least two first mounting holes, indicating that the attitude angle of the dihedral corner reflecting surface 1 is adjusted to 0 °; when the second mounting hole is rotated by two hole positions from 0 ° in the counterclockwise direction in fig. 5(c), the second mounting hole is aligned with the first mounting hole corresponding to 45 ° of the at least two first mounting holes, which indicates that the attitude angle of the dihedral angle reflective surface 1 is adjusted to 45 °.
It can be understood that in the embodiment of the invention, the dihedral angle reflecting surface can be quickly adjusted to various attitude angles through matching and aligning the dial and the mounting hole on the scale plate without calculating the angle on site, thereby improving the speed of adjusting the attitude angles.
In the embodiment of the present invention, as shown in fig. 1, in the omnidirectional adjusting device 3, the second end 18 of the mounting shaft 5 is provided with a thread; thus, the omnidirectional adjusting device 3 can axially rotate along the rotating shaft 9; the pivot shaft 9 may be disposed proximate the first end 10 of the mounting shaft 5.
In the embodiment of the present invention, as shown in fig. 4(b), a pitch lock nut 20 is provided between the sliding shaft 28 and the sliding groove 29, and when the omnidirectional adjusting apparatus 3 is adjusted to a desired pitch angle, the pitch lock nut 20 fixes the sliding shaft 28 to the sliding groove 29.
In the embodiment of the invention, as shown in fig. 6, more than one locking screw 21 is arranged on the shaft sleeve 6, the locking screw 21 is locked into the shaft sleeve 6 from outside to inside through a screw hole on the shaft sleeve 6, and the mounting shaft 5 is fixed through the friction force between the front end of the locking screw 21 and the mounting shaft 5; the second end 18 of the mounting shaft 5 is provided with threads, the locking nut 22 is sleeved at the second end 18 of the mounting shaft 5 through the threads, and the locking nut 22 is screwed to enable the locking nut 22 to be tightly attached to the shaft sleeve 6 so as to fix the mounting shaft 5.
In the embodiment of the invention, as shown in fig. 7, the base 4 further comprises a base mounting plate 25, the base mounting plate 25 is fixedly connected with the vertical support frame 8, an adjusting foot 35 is mounted below the base mounting plate 25, and the adjusting foot 35 is used for quickly adjusting the level. Wherein, adjust lower margin 35 and can contain 3 at least, every is adjusted and is gone up threaded on the lower margin 35, and with the position change of base mounting panel 25, the level that can quick adjustment water platform 7.
In the embodiment of the invention, one surface of three points formed by the three adjusting feet is measured by the leveling instrument, the adjusting feet at the lower points are directly adjusted to be level of the horizontal table, so that the operation is visual and rapid, and the adjusting speed and the easy operation degree of the horizontal table are improved by comparing with the adjustment through 4 points.
In the embodiment of the present invention, as shown in fig. 8, the base 4 further includes: a base mounting plate 25 and one or more support bolts 26; as shown in fig. 9, the support bolt 26 has threads at both ends and a protrusion in the middle, one end is fixed to the base mounting plate 25, and the other end passes through the horizontal table 7, supports the horizontal table 7 by the protrusion, and fixes the horizontal table 7 by a nut. In practical application, four supporting bolts 26 can be arranged at four corners of the horizontal table 7 for assisting horizontal adjustment: the horizontal table 7 is kept horizontal by adjusting the supporting bolts 26.
In the embodiment of the present invention, as shown in fig. 10, the dihedral corner reflector holder 2 includes: a reflecting surface right-angle fixing member 13 arranged at the intersection line of the first reflecting surface 11 and the second reflecting surface 12, and side edge supporting members 14 arranged at both sides of the first reflecting surface 11 and the second reflecting surface 12 of the dihedral corner reflecting surface 1, and may further include a lateral supporting member 15 perpendicular to the side edge supporting members 14; in practical application, the reflecting surface right-angle fixing piece 13, the side edge supporting piece 14 and the transverse supporting piece 15 can be made of a metal piece, such as an aluminum piece, which is milled in a finish machining mode, so that the flatness requirement and the verticality requirement are met.
In the embodiment of the present invention, two sides of the dihedral corner reflector bracket 2 are respectively provided with a reflector diagonal brace 16, and two ends of the reflector diagonal brace 16 are respectively fixed to the first reflector 11 side edge support 14 and the second reflector 12 side edge support 14 which are located at the same side. As shown in fig. 11, the reflection plate diagonal brace 16 may be provided with a measurement mounting bracket 17, and the measurement mounting bracket 17 may be in a specific form as shown in fig. 12, and the measurement mounting bracket 17 is used for mounting an azimuth measuring instrument; the azimuth measuring instrument comprises a compass theodolite; the reflective plate diagonal brace 16 may be made of a non-metallic material, such as nylon; in practical application, the reflector plate diagonal brace 16 requires good straightness, the surface flatness requires the full-length unevenness to be less than 0.2mm, and a fixing hole can be formed in the middle of the reflector plate diagonal brace 16 and used for fixing the measuring mounting frame 17. The dihedral angle reflecting surface 1 and the dihedral angle reflecting surface bracket 2 and parts on the dihedral angle reflecting surface bracket 2 can be riveted together through countersunk rivets, so that the dihedral angle reflecting surface 1 is kept flat.
In the embodiment of the present invention, the structure for fixing the dihedral corner reflector holder 2 at the first end 10 of the mounting shaft 5, as shown in fig. 13(a) and 13(b), includes: the reflecting surface right-angle fixing piece 13 is provided with a square shaft, the first end 10 of the mounting shaft 5 is provided with a square pit corresponding to the square shaft, the reflecting surface right-angle fixing piece 13 is mounted in the square pit of the mounting shaft 5 through the square shaft and is fixed by a screw, and in practical application, the reflecting surface right-angle fixing piece 13 at the central point position of the intersection line of the two reflecting surfaces of the dihedral angle reflecting surface 1 can be selected as a fixed point; the fixing method is convenient to process and separately transport, and can realize quick field installation. Therefore, the dihedral angle reflecting surface bracket 2 arranged on the omnidirectional adjusting device 3 can axially rotate along the installation shaft 5, and axially rotate along the installation shaft 5 to be called as attitude angle adjustment, and axially rotate along the rotation shaft 9 along with the omnidirectional adjusting device 3, so that omnidirectional adjustment of a pitch angle and an attitude angle is realized.
In the embodiment of the invention, as shown in fig. 14, a connecting device is arranged on the dihedral corner reflecting surface bracket 2 and used for connecting a pull rope 23, and the other end of the pull rope 23 is connected with a ground nail 24; the shape of the ground nail 24 can be as shown in fig. 15, the ground nail 24 is fixed on the ground, and the dihedral corner reflector bracket 2 is tightened and fixed through the pull rope 23, so that the influence of wind power on the dihedral corner reflector bracket 2 can be prevented; the connecting devices can be arranged at four end positions outside the dihedral corner reflecting surface bracket 2; wherein the connecting means may be an opening in the dihedral corner reflector holder 2 and the string 23 may be tied in the opening.
In order to reduce the reflection intensity of the base 4 to radar waves and reduce the interference of an external background to the reflected waves, the dihedral angle reflecting surface bracket 2, the omnidirectional adjusting device 3 and other fixing screws and nuts for adjustment can be made of metal, such as stainless steel and other materials; the rest parts can be made of nonmetal materials, such as nylon, epoxy resin plates and the like.
The use of the present invention is described in further detail below with reference to specific examples.
The passive dihedral angle external calibrator can only work at a correct angle and posture at a preset position after reflecting the microwave rays of the radar, so that the dihedral angle reflecting surface 1 needs to be adjusted after the passive dihedral angle external calibrator is placed at the preset position, and the adjustment sequence is as follows:
A. and (3) position determination: the installed passive dihedral angle external calibrator is placed at a preset position, the ground is preferably hard and flat, and the accurate position is measured by recording a GPS;
B. horizontal adjustment: adjusting the adjusting feet under the base to enable the horizontal table 7 to be horizontal, and adjusting four supporting bolts 26 on the base 4 to enable the horizontal table 7 to be horizontal and capable of measuring by using a horizontal ruler; the foundation can be adjusted more quickly, and the requirement on the ground is reduced.
C. Course adjustment: as shown in fig. 16, the measurement mounting frame 17 is mounted on the reflector diagonal 16, the pin of the measurement mounting frame 17 is mounted in the middle hole of the reflector diagonal 16, the compass theodolite 27 is fixed on the measurement mounting frame 17, the dihedral corner reflector bracket 2 is rotated to make the dihedral corner reflector bracket 2 horizontal, the locking screw 21 and the locking nut 22 are screwed, the direction of the base mounting plate 25 is adjusted, the azimuth of the dihedral corner reflector 1 is measured by the compass theodolite 27, the angle displayed on the compass theodolite 27 on the dihedral corner reflector 1 is consistent with the course, and the base mounting plate 25 is fixed after the correct position is obtained;
D. pitch adjustment: installing two measuring installation frames 17 on a reflecting plate inclined strut 16, fixing a compass warp-weft instrument 27 on the two measuring installation frames 17, loosening a pitching quick-locking nut 20 on a base 4, shaking an adjusting handle 34 to enable a gear 32 to roll on a rack 33, driving a sliding shaft 28 to slide up and down in a sliding groove 29 of a vertical support frame 8, simultaneously driving an outer shaft 36 to move by the sliding shaft 28, thereby pushing a connecting rod 19 and a shaft sleeve 6 to move, enabling the pitch angle of a dihedral angle reflecting surface 1 to change, measuring the pitch angle of the reflecting surface by using the compass theodolite 27, enabling the central normal of the dihedral angle reflecting surface 1 to be aligned with a radar, and locking the pitching quick-locking nut 20 after obtaining a correct position as shown in fig. 17(a) and fig. 17 (b);
E. and (3) posture angle adjustment: as shown in fig. 6, the locking screw 21 and the locking nut 22 are loosened, the dihedral corner reflector bracket 2 is rotated so that the first mounting hole of the scale plate 30 mounted on the mounting shaft 5 corresponds to the second mounting hole of the scale plate 31 mounted on the boss 6, and the specified angles of 0 °, 22.5 °, and 45 ° can be rapidly adjusted according to the positions of fig. 5(a), 5(b), and 5 (c). After the correct position is obtained, the locking screw 21 and the locking nut 22 are fixedly screwed, so that the corresponding holes of the scale 30 and the scale 31 are locked by the locking screw 21 and the locking nut 22.
Theoretical calculation compounding is that α is set as a pitch angle, β is set as an attitude angle, the attitude angle is coupled with the pitch angle, the pitch angle needs to be adjusted first, and then the attitude angle needs to be adjusted, however, when the pitch angle α is (α is not equal to 0 degrees or α is not equal to 90 degrees), the attitude angle β is difficult to measure directly, and the theoretical calculation compounding is set as shown in fig. 18
The compass theodolite attitude rotation angle can be measured by the compass theodolite 27, which is the angle rotated by the compass theodolite attitude when the pitch angle is α and the attitude angle is β
Research finds out the attitude angle and the compass theodolite attitude rotation angle
The following relationships exist:
thus, by adjusting the compass theodolite attitude rotation angle
The attitude angle β can be adjusted, and the compass theodolite attitude rotation angle when the pitch angle is α and the attitude angle is β is obtained by calculation
After the angle, the compass theodolite posture rotation angle is measured by the compass theodolite 27
As shown in fig. 19, the correctness of the quick adjustment angle can be checked.
F. Ground tensioning device: after the adjustment of each angle is finished, the ground nails 24 are fixed in four directions around the dihedral angle reflector bracket 2, the pull rope 23 is connected through the tensioning adjusting nut, and the pull rope 23 is tensioned through adjusting the tensioning adjusting nut, so that the stress in each direction is uniform, and the aim of resisting wind is fulfilled. On soft ground, the ground fixing ground nails 24 can also be fixed on four hole sites of the ground mounting plate, and the head parts of the ground nails 24 in front of the dihedral angle reflecting surface 1 are covered by wave-absorbing materials to reduce reflection. On the cement road surface which can not be used by the ground nail 24, the non-metal weight can be pressed on the ground mounting plate, and the aim of resisting wind can be achieved.
The above description is only exemplary of the present invention and should not be construed as limiting the scope of the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A passive dihedral outer scaler, comprising: the device comprises a dihedral angle reflecting surface, a dihedral angle reflecting surface bracket, an omnidirectional adjusting device, a base, a connecting rod and a sliding adjusting device, wherein the dihedral angle reflecting surface is fixed on the dihedral angle reflecting surface bracket, and the omnidirectional adjusting device is movably connected with the base; the omnidirectional adjusting device comprises an installation shaft and a shaft sleeve; the dihedral angle reflecting surface bracket is fixed at the first end of the mounting shaft and rotates along the axial direction of the mounting shaft;
the base comprises two vertical supporting frames and a rotating shaft; wherein,
the shaft sleeve is arranged between the two vertical support frames and is connected with the vertical support frames through a rotating shaft between the two vertical support frames so as to rotate along the axial direction of the rotating shaft;
one end of the connecting rod is hinged with the shaft sleeve, the other end of the connecting rod is connected with the sliding adjusting device, and the sliding adjusting device is connected to the vertical supporting frame;
and the sliding adjusting device is used for driving the connecting rod through longitudinal movement along the vertical supporting frame to complete the pitch angle adjustment of the dihedral angle reflecting surface.
2. The passive dihedral outer scaler of claim 1, wherein said sliding adjustment means comprises: the vertical support frame further comprises a sliding groove, and the other end of the connecting rod is connected with the sliding shaft; the sliding shaft is fixedly connected with the gear; a rack is fixed on the outer side of the vertical support frame; the gear is meshed with the rack; the shaking adjusting handle is connected with the gear; wherein,
the sliding shaft can slide in the sliding groove in the longitudinal direction of the vertical support frame;
the outer shaft is sleeved outside the sliding shaft, is in clearance fit with the sliding shaft and is used for enabling the outer shaft to freely rotate on the sliding shaft; and the rocking adjusting handle is used for driving the gear to move on the rack, so that the connecting rod is driven to move through the movement of the gear, and the pitch angle adjustment of the dihedral angle reflecting surface is completed.
3. The passive dihedral outer scaler according to claim 1 or 2,
a dial is fixed on the shaft sleeve, at least two first mounting holes are formed in the dial, and a preset angle is formed between the at least two first mounting holes at intervals; a scale plate parallel to the dial is fixed on the mounting shaft, and a second mounting hole is formed in the scale plate; the at least two first mounting holes are matched and aligned with the second mounting holes so as to adjust the attitude angle of the dihedral angle reflecting surface.
4. The passive dihedral outer scaler of claim 3,
the first end of the mounting shaft is one end protruding outside the shaft sleeve;
the scale sheet is nested on the first end of the mounting shaft; the first end of the mounting shaft is close to one end of the dihedral angle reflecting surface bracket;
the dial is nested on the shaft sleeve close to the first end of the mounting shaft and is relatively parallel to the scale plate;
the installation axle is in the axle sleeve internal rotation drives dihedral angle plane of reflection with the scale piece rotates, works as the scale piece the second mounting hole rotate with when the first mounting hole of arbitrary one in at least two first mounting holes of calibrated scale aligns, will dihedral angle plane of reflection adjusts corresponding preset attitude angle.
5. The passive dihedral outer scaler of claim 3,
the at least two first mounting holes are uniformly distributed on the circumferential edge of the dial plate;
the second mounting holes are positioned close to the edge of the scale plate and are equidistant from the at least two first mounting holes in the radial direction;
a preset angle at an interval between the at least two first mounting holes is a non-zero minimum preset attitude angle in the at least one preset attitude angle; the dihedral corner reflectors may operate at the at least one preset attitude angle.
6. The passive dihedral angle outer scaler of claim 2, wherein a pitch snap nut is disposed between said sliding shaft and said sliding groove, said pitch snap nut being adapted to secure said sliding shaft to said sliding groove.
7. The passive dihedral angle outer scaler according to any one of claims 1, 2, or 4 to 6, wherein the base further comprises a base mounting plate fixedly connected with the vertical support frame, and an adjusting foot is mounted under the base mounting plate and used for rapidly adjusting the level.
8. The passive dihedral outer scaler according to any one of claims 1, 2, or 4 to 6,
more than one locking screw is arranged on the shaft sleeve, the locking screw is locked into the shaft sleeve from outside to inside through a screw hole in the shaft sleeve, and the mounting shaft is fixed through the friction force between the front end of the locking screw and the mounting shaft.
9. The passive dihedral outer scaler according to any one of claims 1, 2, or 4 to 6,
and a second end of the mounting shaft is provided with threads, a locking nut is sleeved at the second end of the mounting shaft through the threads, and the locking nut is screwed to enable the locking nut to be tightly attached to the shaft sleeve to fix the mounting shaft.
10. The passive dihedral outer scaler of claim 1, wherein said dihedral corner reflector mount comprises: the reflecting surface right-angle fixing piece is arranged on the intersection line of a first reflecting surface and a second reflecting surface of the dihedral angle reflecting surface, and the side edge supporting pieces are arranged on two sides of the first reflecting surface and the second reflecting surface; the dihedral angle reflecting surface bracket also comprises more than one reflecting plate inclined strut; wherein,
the reflecting plate inclined supports are arranged on two sides of the dihedral reflecting surface support, and two ends of each reflecting plate inclined support are fixedly connected to the first reflecting surface side edge support and the second reflecting surface side edge support which are located on the same side respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010295851.9A CN111562550B (en) | 2020-04-15 | 2020-04-15 | Passive dihedral angle external scaler |
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| CN202010295851.9A CN111562550B (en) | 2020-04-15 | 2020-04-15 | Passive dihedral angle external scaler |
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| CN113156377A (en) * | 2021-04-22 | 2021-07-23 | 中国科学院空天信息创新研究院 | Dihedral corner reflector |
| CN116008988A (en) * | 2023-02-24 | 2023-04-25 | 中国科学院空天信息创新研究院 | Three-face angle passive scaler for quantitative remote sensing |
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Also Published As
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| CN111562550B (en) | 2023-09-29 |
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