CN109269441B - Error detection method for geometrical performance of bow-shaped frame system - Google Patents
Error detection method for geometrical performance of bow-shaped frame system Download PDFInfo
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The application discloses bow-shaped rack system geometric performance error detection method has solved the difficult accurate problem of measuring of bow-shaped rack system geometric performance, the method contains following step: measuring the flatness of the semicircular base; detecting the control precision of the angles of the upper arched arm and the lower arched arm; measuring the distance between the output ports of the transmitting antenna and the receiving antenna and the center of the sample plate to be measured; detecting the height consistency of the transmitting antenna and the receiving antenna with the sample plate to be detected; measuring the pitch angles, the rotation angles and the inclination angles of the transmitting antenna and the receiving antenna; measuring the pitch angle, the rotation angle and the inclination angle of the template bracket; detecting that the surface of the screed support is located in the centre of the bow. The method in the application improves the precision of system adjustment, verifies each dimensionality of the bow rack, and provides a basis for the influence of later-stage bow rack geometric errors on the uncertainty of the reflectivity measurement result.
Description
Technical Field
The invention belongs to the field of microwave testing, and particularly relates to an error detection method for geometrical performance of a bow-shaped frame system for measuring reflectivity of a wave-absorbing material.
Background
The bow method is one of the most widely applied methods for measuring the reflectivity of the wave-absorbing material at present. The bow-shaped frame is a hardware main body of the bow-shaped reflectivity measuring system and plays roles in fixing the receiving and transmitting antennas, changing the incident angles of the receiving and transmitting antennas, adjusting the distances between the receiving and transmitting antennas and the measured sample plate to meet far-field conditions and the like.
Common brackets include semicircular brackets, "7" brackets, "T" horizontal brackets, and the like. The bow-rack system is a complex multi-dimensional system and can realize adjustment of incidence angle, R radial direction, antenna attitude (comprising height, pitching, rotating, tilting and the like), template support attitude (comprising longitudinal direction, transverse direction, pitching, tilting, rotating and the like) and the like. Although the bows are of various forms, their design goals are consistent, with multi-dimensional adjustments being achieved using manual or automatic controls. In practice, the actual adjustment accuracy is lower than the design target due to assembly, machining tolerance, control signal missing, and the like, and particularly, in the millimeter wave frequency band reflectivity bow measurement, the geometric positioning requirement on the bow rack is more strict.
Disclosure of Invention
In view of this, in order to solve the problem that the geometric performance of the bow system is difficult to accurately measure, the embodiment of the present application provides an error detection method for the geometric performance of the bow system.
The embodiment of the application provides an error detection method for geometric performance of a bow rack system, the bow rack system comprises a bow rack, a transmitting antenna, a receiving antenna, a tested sample plate and a sample plate support, the bow rack is provided with an upper bow arm and a lower bow arm, the transmitting antenna and the receiving antenna are installed on the upper bow arm and the lower bow arm, the bow rack is provided with a semicircular track, the semicircular track is installed on the semicircular base, one end of the upper bow arm and one end of the lower bow arm are movably connected with a central shaft at the circular point of the semicircular track, the other end of the upper bow arm and the other end of the lower bow arm can move along the semicircular track, a relative angle encoder for measuring the rotation angle of the upper bow arm and the lower bow arm is installed on the sample plate support, the bow rack and the tested sample plate are oppositely placed, and the error detection method is characterized in that, comprises the following steps: measuring the flatness of the semicircular base; detecting the control precision of the angles of the upper arched arm and the lower arched arm; measuring the distance between the output ports of the transmitting antenna and the receiving antenna and the center of the sample plate to be measured; detecting the height consistency of the transmitting antenna and the receiving antenna with the sample plate to be detected; measuring the pitch angles, the rotation angles and the inclination angles of the transmitting antenna and the receiving antenna; measuring the pitch angle, the rotation angle and the inclination angle of the template bracket; detecting that the surface of the screed support is located in the centre of the bow.
Further, the measuring the distance between the output ports of the transmitting antenna and the receiving antenna and the center of the sample plate to be measured comprises the following steps: a laser range finder is arranged on the antenna support; emitting laser to the center of a sample plate to be measured; adjusting the position of the laser range finder to enable a laser focal spot to be positioned on the central line of the sample plate to be measured; the distance is equal to the sum of the total length of the antenna and the distance between the laser range finder and the caliber of the antenna subtracted from the reading of the laser range finder.
Further, the measuring the flatness of the semicircular base comprises the following steps: moving a level along the semi-circular base; the maximum amount of movement of the level is observed.
Further, the control accuracy of the angles of the upper and lower arcuate arms is equal to the resolution accuracy of the relative angle encoders mounted at the central shaft.
Further, the method for evaluating the consistency of the heights of the transmitting antenna and the receiving antenna with the tested sample plate comprises the following steps: installing horizontal laser instruments on the transmitting antenna and the receiving antenna; adjusting the level of the level laser; adjusting the heights of the transmitting antenna and the receiving antenna and the sample plate to be measured to enable the laser emitted by the horizontal laser instrument to be on the horizontal central line of the sample plate to be measured; the height adjustment error is equal to the sum of the laser beam line width and the horizontal laser precision.
Further, the transmitting antenna and receiving antenna elevation angle measurement comprises the following steps: on the base of the transmitting antenna and the receiving antenna bracket, selecting a plurality of positions to measure along the placing direction of the transmitting antenna and the receiving antenna; adjusting the posture of the bracket base to enable the measured value of the digital display inclinometer to be zero; the measurement error is the measurement accuracy of the inclinometer.
Further, the measuring of the rotation angle of the transmitting antenna and the receiving antenna comprises the following steps: selecting a plurality of positions on the bases of the transmitting antenna and the receiving antenna bracket along the vertical direction of the transmitting antenna and the receiving antenna for measurement; adjusting the posture of the bracket base to enable the measured value of the digital display inclinometer to be zero; the measurement error is the measurement accuracy of the inclinometer.
Further, the measurement of the rotation angle of the screed stand comprises the steps of: embedding a cursor laser instrument in the central shaft; making a positioning mark on the lower frame of the template support; adjusting the sample plate support to enable the cross cursor signal of the laser instrument to be superposed with the positioning mark; the template holder rotation angle measurement error is an error introduced by the laser line width and the positioning mark width.
Further, the measurement of the inclination angle of the screed holder comprises the steps of: respectively placing a digital display inclinometer on the upper frame, the lower frame, the left frame and the right frame of the sample plate; adjusting to zero the measured value; the inclination angle error is the measurement error of the digital display inclinometer.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
the method is provided for evaluating the geometric performance of the bow rack system, the precision of system adjustment is improved, all dimensions of the bow rack are verified, and a basis is provided for influence of geometric errors of the bow rack on the uncertainty of the reflectivity measurement result in a later period.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.
In the drawings:
figure 1 is a schematic view of a bow system;
FIG. 2 is a schematic central axis;
FIG. 3 is a method of error detection of the geometry of the gantry system;
FIG. 4 is a schematic view of a laser rangefinder installation;
fig. 5 is a schematic view of focal spot displacement.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
FIG. 1 is a schematic view of a bow rack system comprising a bow rack 101, a transmitting antenna 102, a receiving antenna 103, a sample plate 104 to be measured and a sample plate holder 105, wherein the bow rack has an upper bow arm 106 and a lower bow arm 107, the transmitting antenna 102 and the receiving antenna 103 are respectively mounted on the upper bow arm and the lower bow arm, the bow rack has a semicircular track 108 mounted on a semicircular base 109, one end of the upper bow arm and one end of the lower bow arm are movably connected with a central shaft 110 at a circular point of the semicircular track, the other end of the upper bow arm and the lower bow arm are movable along the semicircular track, and the central shaft is mounted with a device for measuring the rotation angle (theta) of the upper bow arm and the lower bow arm1And theta2) The sample plate to be measured is mounted on the sample plate holder, and the bow and the sample plate to be measured are placed opposite to each other.
Fig. 2 is a schematic diagram of a central shaft on which an upper arcuate arm 106, a lower arcuate arm 107, an opposite angle encoder 111, an upper arm bidirectional flange 201 and a lower arm bidirectional flange 202 are mounted, in which the initial zero position is fixed with respect to the center of the main shaft in the gantry apparatus coordinate system, and the reference position of the opposite angle encoder is assembled with the initial zero position of the main shaft, ensuring the accuracy of the initial zero position, and the error is negligible. The main shaft extends the two-way flange, goes up bow-shaped arm and the threaded connection above the two-way flange of upper arm, and the lower bow-shaped arm is threaded connection above the two-way flange of underarm, relative angle encoder and the two-way flange of upper arm and the lower arm below threaded connection.
Fig. 3 is an error detection method for the geometrical performance of the bow rack system, which comprises the following steps:
step 301: and measuring the flatness of the semicircular base.
The method for measuring the flatness of the semicircular base comprises the following steps:
moving a level along the semi-circular base;
the maximum amount of movement of the level is observed.
Preferably, the level gauge is a frame level gauge, and the maximum movement of the base of the bow-shaped frame measuring bow is +/-6 grids. The bow base flatness is 0.0432.
Step 302: and detecting the control precision of the angles of the upper arched arm and the lower arched arm.
The upper arcuate arm angle θ1And lower arcuate arm angle theta2The measurement is performed by using a relative angle encoder, and the measurement error mainly comes from the following sources: first, errors introduced with respect to the initial position of the angular encoder; secondly, errors introduced by assembly errors; third, errors introduced with respect to the resolution of the angular encoder.
In the bow-shaped frame device coordinate system, relative to the center of the main shaft, the initial zero position is fixed, the reference position of the opposite angle encoder is assembled with the initial zero position of the main shaft, the accuracy of the initial zero position is guaranteed, and errors in the initial zero position are negligible. The main shaft extends the two-way flange, and upper arcuate arm and the threaded connection above the two-way flange of upper arm, lower arcuate arm and the threaded connection above the two-way flange of underarm, relative angle encoder and the two-way flange of upper arm and the lower arm below threaded connection, the error that this part introduces can be calculated according to machining error evaluation. The interference fit between the upper arched arm, the lower arched arm and the relative angle encoder and the spindle is negligible in error after analysis, so that the control precision of the angles of the upper arched arm and the lower arched arm can be considered as the resolution of the relative angle encoder, namely the control precision of the angles of the upper arched arm and the lower arched arm is equal to the resolution of the relative angle encoder installed at the central shaft.
The resolution of the relative angle encoder is 0.017556 deg., the control accuracy of the angle of incidence is about 0.018 deg..
Step 303: measuring the distance between the output ports of the transmitting antenna and the receiving antenna and the center of the sample plate to be measured;
the distance between the output ports of the transmitting antenna and the receiving antenna and the center of the sample plate to be measured is called as an arch radius, and a laser distance meter is adopted for measurement.
The method for measuring the distance between the output ports of the transmitting antenna and the receiving antenna and the center of the sample plate to be measured, namely the arc radius, comprises the following steps: a laser range finder is arranged on the antenna support; emitting laser to the center of a sample plate to be measured; adjusting the position of the laser range finder to enable a laser focal spot to be positioned on the central line of the sample plate to be measured; the distance is equal to the sum of the total length of the antenna and the distance between the laser range finder and the caliber of the antenna subtracted from the reading of the laser range finder.
Step 304: detecting the height consistency of the transmitting antenna and the receiving antenna with the sample plate to be detected;
the consistency of the heights of the transmitting antenna and the receiving antenna with the tested sample plate is evaluated, and the method comprises the following steps: respectively installing a horizontal laser instrument on the transmitting antenna and the receiving antenna; adjusting the level of the level laser; adjusting the heights of the transmitting antenna and the receiving antenna and the sample plate to be measured to enable the laser emitted by the horizontal laser instrument to be on the horizontal central line of the sample plate to be measured; the height adjustment error is equal to the sum of the laser beam line width and the horizontal laser precision.
The height consistency of the transmitting antenna, the receiving antenna and the center of the calibration sample plate is measured by adopting a horizontal laser instrument LS628, the level of the horizontal laser instrument LS628 is firstly adjusted, and the heights of the transmitting antenna, the receiving antenna and the sample plate bracket are adjusted, so that a horizontal laser line is on the horizontal center line of the sample plate to be measured. The measurement error is the sum of the line width and the reading of the indication, and is about 0.5 mm.
Step 305: measuring the pitch angles, the rotation angles and the inclination angles of the transmitting antenna and the receiving antenna;
the transmitting antenna and receiving antenna elevation angle measurement comprises the following steps: on the base of the transmitting antenna and the receiving antenna bracket, selecting a plurality of positions for measurement along the placing direction of the transmitting antenna and the receiving antenna, preferably selecting four positions; adjusting the posture of the bracket base to enable the measured value of the digital display inclinometer to be zero; the measurement error is the measurement accuracy of the inclinometer.
The digital display inclinometer DIL-3(350712559) is selected to measure the pitching angles of the transmitting antenna and the receiving antenna, four positions are selected on the antenna bracket base in the direction parallel to the antenna placement direction to respectively measure the pitching angles, and the measured values of the upper arc arm antenna base are respectively 0.00 degrees, 0.00 degrees and the measured values of the lower arc arm antenna base are respectively 0.00 degrees, 0.00 degrees and 0.00 degrees through precise adjustment. The pitch angle measurement error is therefore the measurement accuracy of the inclinometer, i.e. 0.15 °.
The measuring of the rotation angle of the transmitting antenna and the receiving antenna comprises the following steps: on the base of the transmitting antenna and the receiving antenna bracket, selecting a plurality of positions for measurement along the vertical direction of the transmitting antenna and the receiving antenna, preferably selecting three positions; adjusting the posture of the bracket base to enable the measured value of the digital display inclinometer to be zero; the measurement error is the measurement accuracy of the inclinometer.
And a digital display inclinometer DIL-3(350712559) is selected to measure the rotation angles of the transmitting antenna and the receiving antenna. Three positions are selected on the antenna support base in the direction perpendicular to the antenna placement direction for measurement respectively, and the measured values of the upper arm antenna base are respectively 0.00 degrees, 0.00 degrees and 0.00 degrees through adjusting the posture of the base, and the measured values of the lower arm antenna base are respectively 0.00 degrees, 0.00 degrees and 0.00 degrees. The rotation angle measurement error is therefore 0.15 °.
The inclination angles of the transmitting antenna and the receiving antenna are not easy to measure, a common measuring method is to position by adopting a laser positioner, fix the laser positioner on the transmitting antenna and the receiving antenna through a tool, keep the laser positioner consistent with the geometric center (phase center) of the antenna, project a laser beam on a sample plate to be measured and display two light spots. And the deviation angle of the transmitting antenna and the receiving antenna can be obtained by judging the distance and the arc radius of the two light spots. The method has tooling errors, spot deviation errors and the like, and is difficult to judge if the phase center of the antenna deviates from the geometric center.
The application adopts a transmission measurement method to determine the position of a transmitting and receiving antenna: firstly, fixing a receiving antenna, rotating a transmitting antenna within a range of-90 degrees to +90 degrees, searching the maximum value of a transmission amplitude value between the transmitting antenna and the receiving antenna at the moment, wherein the position of the transmitting and receiving antenna corresponding to the maximum value is the aligning position of the transmitting and receiving antenna, and the inclination angle of the antenna can be ignored at the moment.
Step 306: measuring the pitch angle, the rotation angle and the inclination angle of the template bracket;
the pitch angle of the sample plate support is measured by adopting a sample plate support self-carrying digital display inclinometer, and the measurement precision is the measurement error of the digital display inclinometer. The pitching angle of the sample plate support is measured by a sample plate support self-digital display inclinometer, and the measurement precision is about 0.15 degrees.
The measurement of the rotation angle of the screed stand, comprising the steps of: embedding a cursor laser instrument in the central shaft; making a positioning mark on the lower frame of the template support; adjusting the sample plate support to enable a cursor signal of the laser instrument to be superposed with the positioning mark; the template holder rotation angle measurement error is an error introduced by the laser line width and the positioning mark width.
Preferably, the laser instrument is a cross cursor laser instrument, and the positioning mark is in a cross shape. The measurement error of the rotation angle of the sample plate support is determined to be about 0.4 degrees by a cross-shaped optical mark method.
The measurement of the screed holder tilt angle comprises the steps of: respectively placing a digital display inclinometer on the upper frame, the lower frame, the left frame and the right frame of the sample plate; adjusting to zero the measured value; the inclination angle error is the measurement error of the digital display inclinometer.
A sample plate to be measured is arranged on a sample plate bracket, a digital display inclinometer DIL-3(350712559) is respectively arranged on an upper frame and a lower frame of the sample plate to be measured, and the measured values are adjusted to be 0.00 degree and 0.00 degree; then, digital display inclinometer DIL-3(350712559) was placed on the left and right frames of the sample plate to be measured, and the measurement values were adjusted to 0.00 ° and 0.00 °. The tilt angle error can be considered as the measurement error of 0.10 ° for the digital display inclinometer.
Step 307: detecting that the surface of the screed support is located in the centre of the bow.
Said evaluation screed support surface being located in the centre of the bow, comprising the steps of: and moving the upper arched arm and the lower arched arm along the semicircular track, and simultaneously adjusting the position of the sample plate support to enable the focal spot of the laser range finder to be positioned on the central line of the sample plate support.
Fig. 4 is a schematic view of a laser rangefinder installation. Preferably, the transmitting antenna and the receiving antenna are horn antennas. The laser range finder 401 is mounted on a support base 402 of the antenna, the position of the laser range finder is adjusted to enable the focal spot of the laser range finder to be located on the center line of the sample plate support, the antenna support base is respectively fixed on the upper arched arm and the lower upper arched arm, and when the upper arched arm and the lower arched arm move along the circumferential direction or the radial direction, the laser range finder moves along with the upper arched arm and the lower arched arm. In the moving process, the focal spot of the laser range finder is required to be always positioned on the center line of the sample plate support. The input port 403 of the antenna can be regarded as a phase center, the length L of the antenna is fixed, the distance from the installation position of the laser distance meter to the aperture surface 404 of the antenna is a, the distance from the laser distance meter to the sample plate to be measured is b, and the bow radius is b-a + L.
The arc radius and the positioning repeatability of the upper arc-shaped arm and the lower arc-shaped arm at different incident angles and different positions are respectively measured according to the method. There are three main sources of error in ranging: the accuracy of the laser range finder, the resolution of the grating and the measurement repeatability are integrated, and the accuracy of the bow radius can be obtained by integrating the measurement result and the error analysis.
On the premise that the heights of the transmitting antenna, the receiving antenna and the sample plate support are adjusted to be consistent, focal spots of the two laser range finders are not overlapped, and the laser range finders are not consistent in installation height of internal light sources. This does not affect the measurement of the bow radius.
The laser range finder is used for measuring the arch radius, and upper arm arch radius measurement data and lower arm arch radius measurement data are shown in tables 1-4 respectively. The accuracy of the laser range finder is 1.25mm, the grating resolution is 1 μm, and the measurement repeatability is about 1.6 μm, so the accuracy of the bow radius is about 1.25 mm.
TABLE 1 Upper arm arcuate radius measurement data one
TABLE 2 Upper arm arcuate radius measurement data two
TABLE 3 measurement of radius of bow for lower arm
TABLE 4 measurement of radius of bow of lower arm
Preferably, the laisaii laser is used to emit a vertical laser line in the centre of the screed stand, the position of the centre of the screed stand being marked by means of the laser line.
Fig. 5 is a schematic view of focal spot displacement. The laser distance measuring device comprises a first focal spot 501, a second focal spot 502 and a third focal spot 503, wherein the first focal spot is a left focal spot of the laser distance measuring device when the laser distance measuring device is on the center line of a sample plate support, and the second focal spot and the third focal spot are focal spots of the laser distance measuring device when the focal spot offset is maximum. The laser range finder fixes the radial position, the upper arched arm and the lower arched arm move along the semicircular track, and the position of the sample plate support is adjusted at the same time, so that the focal spot of the laser range finder is located on the center line of the sample plate support, and the surface of the sample plate support can be considered to be located at the center of the bow-shaped support. If the template holder is offset from the centre of the bow, the focal spot will shift when the transmitting antenna changes the angle of incidence. In actual measurement, due to assembly, inconsistency of the arc-shaped track and the like, the focal spot cannot be fixed when the arc-shaped arm rotates. By adjusting the front and back positions of the sample plate support, when the incident angles of the upper arched arm and the lower arched arm are changed, the focal spot offset of the laser range finder is minimum and within an allowable error. The focal spot shift caused by the offset of the template holder reference plane from the center of the bow actually affects the measurement of the bow radius. Moving the arched arm in a range of-90 degrees to +90 degrees, recording two positions of the arched arm when the focal spot offset x is maximum, and measuring values l of the corresponding laser range finders at the two positions1And l2. The bow radius R can be solved by the triangle auxiliary line, and the error introduced by the process to the bow radius is about 2 mm.
The application provides a method for evaluating the geometric performance of a T-shaped horizontal bow rack, solves the problem that the geometric performance of the T-shaped horizontal bow rack used for measuring the reflectivity of an X-waveband wave-absorbing material is difficult to accurately measure, and provides reference basis for evaluating the geometric performance of the T-shaped horizontal bow rack and the geometric performance of a semicircular bow rack and a 7-shaped bow rack in other frequency bands. The evaluation of the geometrical performance of the bracket verifies each dimensionality of the bracket, and provides a basis for analyzing the influence of the geometrical error of the bracket on the uncertainty of the reflectivity measurement result in a later stage. The geometrical performance of the reflectivity bow rack system is evaluated by the method, and the influence quantity of the reflectivity bow rack system can be evaluated in the subsequent reflectivity index evaluation work.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An error detection method for the geometric performance of a bow-shaped rack system comprises a bow-shaped rack, a transmitting antenna, a receiving antenna, a tested sample plate and a sample plate bracket, the bow has an upper bow arm and a lower bow arm, the transmitting antenna and the receiving antenna being mounted on the upper bow arm and the lower bow arm, the bow-shaped frame is provided with a semicircular track which is arranged on the semicircular base, one end of the upper arched arm and one end of the lower arched arm are movably connected with the central shaft at the circular point of the semicircular track, and the other ends can move along the semicircular track, a relative angle encoder for measuring the rotating angles of the upper arched arm and the lower arched arm is arranged on the central shaft, the sample plate to be measured is arranged on the sample plate support, the arch-shaped frame and the sample plate to be measured are oppositely arranged, and the method is characterized by comprising the following steps:
measuring the flatness of the semicircular base;
detecting the control precision of the angles of the upper arched arm and the lower arched arm;
measuring the distance between the output ports of the transmitting antenna and the receiving antenna and the center of the sample plate to be measured;
detecting the height consistency of the transmitting antenna and the receiving antenna with the sample plate to be detected;
measuring the pitch angles, the rotation angles and the inclination angles of the transmitting antenna and the receiving antenna;
measuring the pitch angle, the rotation angle and the inclination angle of the template bracket;
detecting that the surface of the screed support is located in the centre of the bow.
2. The method for detecting errors in the geometrical performance of a bow rack system according to claim 1, wherein the step of measuring the distance between the output ports of the transmitting antenna and the receiving antenna and the center of the sample plate to be measured comprises the following steps:
a laser range finder is arranged on the antenna support;
emitting laser to the center of a sample plate to be measured;
adjusting the position of the laser range finder to enable a laser focal spot to be positioned on the central line of the sample plate to be measured;
the distance is equal to the sum of the total length of the antenna and the distance between the laser range finder and the caliber of the antenna subtracted from the reading of the laser range finder.
3. The method for detecting errors in the geometric properties of a bow frame system according to claim 1, wherein measuring the flatness of said semicircular base comprises the steps of:
moving a level along the semi-circular base;
the maximum amount of movement of the level is observed.
4. The method of claim 3, wherein the control accuracy of the angles of the upper and lower arcuate arms is equal to the resolution accuracy of a relative angular encoder mounted at the central shaft.
5. The method for detecting errors in the geometrical performance of a bow-shaped frame system according to claim 1, wherein the step of detecting the height consistency between the transmitting antenna and the receiving antenna and the tested sample plate comprises the following steps:
respectively installing a horizontal laser instrument on the transmitting antenna and the receiving antenna;
adjusting the level of the level laser;
adjusting the heights of the transmitting antenna and the receiving antenna and the sample plate to be measured to enable the laser emitted by the horizontal laser instrument to be on the horizontal central line of the sample plate to be measured;
the height adjustment error is equal to the sum of the laser beam line width and the horizontal laser precision.
6. The method for detecting errors in the geometrical performance of a bow rack system according to claim 1, wherein measuring the pitch angles of the transmitting antenna and the receiving antenna comprises the steps of:
on the base of the transmitting antenna and the receiving antenna bracket, selecting a plurality of positions to measure along the placing direction of the transmitting antenna and the receiving antenna;
adjusting the posture of the bracket base to enable the measured value of the digital display inclinometer to be zero;
the measurement error is the measurement accuracy of the inclinometer.
7. The method of claim 1, wherein measuring the rotation angles of the transmitting antenna and the receiving antenna comprises the steps of:
selecting a plurality of positions on the bases of the transmitting antenna and the receiving antenna bracket along the vertical direction of the transmitting antenna and the receiving antenna for measurement;
adjusting the posture of the bracket base to enable the measured value of the digital display inclinometer to be zero;
the measurement error is the measurement accuracy of the inclinometer.
8. The method of claim 1, wherein measuring the angle of rotation of the template holder comprises the steps of:
embedding a cursor laser instrument in the central shaft;
making a positioning mark on the lower frame of the template support;
adjusting the sample plate support to enable the cross cursor signal of the laser instrument to be superposed with the positioning mark;
the template holder rotation angle measurement error is an error introduced by the laser line width and the positioning mark width.
9. The method of claim 1, wherein measuring the angle of inclination of the screed holder comprises the steps of:
respectively placing a digital display inclinometer on the upper frame, the lower frame, the left frame and the right frame of the sample plate;
adjusting to zero the measured value;
the inclination angle error is the measurement error of the digital display inclinometer.
10. The method of claim 1, wherein detecting that the template support surface is located at the center of the bow comprises the steps of:
and moving the upper arched arm and the lower arched arm along the semicircular track, and simultaneously adjusting the position of the sample plate support to enable the focal spot of the laser range finder to be positioned on the central line of the sample plate support.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55144534A (en) * | 1979-04-27 | 1980-11-11 | Nec Corp | Measuring device for radio wave scattering characteristic |
| CN104567672A (en) * | 2014-12-25 | 2015-04-29 | 北京无线电计量测试研究所 | Large compact range scanning frame system and method for adjusting space geometric quantity of scanning frame system |
| CN105352978A (en) * | 2015-11-26 | 2016-02-24 | 电子科技大学 | Handheld wave-absorbing material reflectivity measuring device |
| CN106771673A (en) * | 2017-03-07 | 2017-05-31 | 安徽江淮汽车集团股份有限公司 | A kind of gps antenna directionality method of testing and system |
-
2018
- 2018-11-26 CN CN201811418601.9A patent/CN109269441B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55144534A (en) * | 1979-04-27 | 1980-11-11 | Nec Corp | Measuring device for radio wave scattering characteristic |
| CN104567672A (en) * | 2014-12-25 | 2015-04-29 | 北京无线电计量测试研究所 | Large compact range scanning frame system and method for adjusting space geometric quantity of scanning frame system |
| CN105352978A (en) * | 2015-11-26 | 2016-02-24 | 电子科技大学 | Handheld wave-absorbing material reflectivity measuring device |
| CN106771673A (en) * | 2017-03-07 | 2017-05-31 | 安徽江淮汽车集团股份有限公司 | A kind of gps antenna directionality method of testing and system |
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