JP2005003607A - Displacement measuring device, parallelism/displacement/inclination measuring device, and antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacement measuring device capable of measuring displacement of a part to be measured with less constraint on arrangement of measuring devices and that caused by instability of a marker, and to provide an antenna device which corrects the directional error of an antenna using the displacement measuring device. <P>SOLUTION: The device is provided with a part 1 whose displacement is to be measured, a measurement reference part 2 serving as a measurement reference, a laser pointer 3 for generating a marker, a two-dimensional image sensor 4 for photographing an image of the laser pointer 3, a center of gravity calculation part 6 for calculating the center of gravity of the laser beam from the laser pointer 3 based on an image data 5 outputted from the image sensor 4, and a displacement calculating part 8 which calculates displacement of the part to be measured based on a center of gravity position data 7 of the laser beam. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a displacement measuring instrument and a parallel displacement inclination measuring instrument that measure relative displacement of a part to be measured with respect to a measurement reference part, and an antenna device including these measuring instruments in the precision measurement technical field.
[0002]
[Prior art]
For example, in the field of radio astronomy, in recent years, there has been an increasing demand for observation of radio waves with higher frequencies from millimeter waves to submillimeter waves. When observing high-frequency radio celestial bodies, higher accuracy is required for the reflecting mirror surface of the telescope and beam pointing tracking. On the other hand, in order to increase the observation efficiency, it is desired that the diameter of the telescope is increased and that observation can be carried out in all day and night weather conditions.
[0003]
However, as the aperture becomes larger, the deformation of the telescope's weight increases, and thermal deformation due to solar radiation and deformation due to wind pressure increase, making it difficult to obtain high pointing tracking accuracy. In order to satisfy these requirements, a technique for measuring and correcting the pointing error of the telescope reflector in real time is required. Various countermeasures have been proposed in the past (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-3-3402
[0005]
[Problems to be solved by the invention]
As described above, in order to measure the pointing error of the reflecting mirror for pointing tracking, the conventional antenna angle detector includes an optical position detector and a light beam generator on an EL angle detector and an AZ angle detector. There is a problem that it is necessary to install them, and the arrangement of these devices becomes a restriction on the antenna structure.
[0006]
In addition, since the detector used is an optical position detector that detects a light beam, there is a problem that the marker indicating the displacement of the measurement place has a restriction that it must be a high-power light beam generator. .
[0007]
In addition, the conventional antenna angle detection device corrects the output of the angle detector for each axis based on the detected true directivity, but correcting the output of the angle detector in particular corrects the high-frequency pointing error. There was a problem that it was not possible to obtain high-precision antenna tracking accuracy.
[0008]
In addition, since the detector used in the conventional antenna angle detector is an optical position detector that detects a light beam, there has been a problem that the marker indicating the displacement of the measurement location must not be unstable.
[0009]
Further, particularly during measurement, there has been a problem that the center of gravity of the marker fluctuates due to a change in the shape of the beam from the light beam generator, even though the measurement location is not displaced.
Further, there has been a problem that the position of the center of gravity of the marker fluctuates due to high-frequency noise caused by the environment on the beam from the light beam generator.
Furthermore, if the beam from the light beam generator is not a Gaussian beam, there has been a problem that the position of the center of gravity of the marker fluctuates.
[0010]
The present invention has been made in order to solve the above-described problems, and is provided with a displacement measuring instrument that can measure the displacement of a measured part with few restrictions due to the arrangement of the measuring instrument and the instability of the marker, and the measured part. An object of the present invention is to obtain a parallel displacement inclination measuring instrument capable of measuring the parallel displacement and inclination of the antenna, and an antenna device that corrects an antenna pointing error using the displacement measuring instrument or the parallel displacement inclination measuring instrument.
[0011]
[Means for Solving the Problems]
The displacement measuring device according to the present invention includes a measurement reference unit including a marker indicating a position, an image sensor provided in a measurement target unit facing the marker, and an image of the center of gravity of the image captured by the image sensor. A pixel number initial setting unit that initially sets the number of pixels used for calculating the position, and a barycentric position that calculates the barycentric position of the marker image based on the nearest pixel number among the pixel numbers initially set by the pixel number initial setting unit A calculation unit and a displacement calculation unit that calculates the displacement of the measurement target unit based on the barycentric position of the marker calculated by the barycentric position calculation unit.
[0012]
The parallel displacement inclination measuring device according to the present invention includes a measurement reference unit including a first marker representing a position, a measured unit including a second marker representing a position, and a measurement target facing the first marker. A first imaging device provided in the measurement unit, a second imaging device provided in the measurement reference unit facing the second marker, and first and second images taken by the first and second imaging elements Based on the pixel number initial setting unit that initially sets the number of pixels used for calculating the center of gravity position of the image with respect to the marker image and the closest pixel number among the pixel numbers that are initially set by the pixel number initial setting unit, And a center-of-gravity position calculation unit that calculates the center-of-gravity position of the image of the second marker, and a displacement inclination calculation unit that calculates the displacement and inclination of the measured part based on the center-of-gravity position of the marker calculated by the center-of-gravity position calculation unit It is to be prepared.
[0013]
An antenna device according to the present invention is provided at the bottom of an antenna mount so as to face the first marker, an antenna mount that supports an elevation drive shaft of the antenna, a first marker that represents a position provided on the top of the antenna mount, and The first imaging device, the second marker representing the position provided at the bottom of the antenna mount, the second imaging device provided on the top of the antenna mount facing the second marker, the first and first Initially set by the pixel number initial setting unit and the pixel number initial setting unit for initial setting of the number of pixels used to calculate the center of gravity position of the image for the first and second marker images captured by the two image sensors Based on the closest number of pixels in the number of pixels, the centroid position calculation unit that calculates the centroid position of the first and second marker images, and the centroid position of the first and second markers calculated by the centroid position calculation unit Based antenna Those having a displacement gradient calculation unit for calculating a slope and the top of parallel displacement of the platform.
[0014]
An antenna device according to the present invention includes an antenna mount that supports an elevation angle drive shaft of an antenna, a first marker that represents a position provided on an upper portion of the antenna mount, and a bottom portion of the antenna mount that faces the first marker. A first imaging element provided; a second marker representing a position provided at the bottom of the antenna gantry; a second imaging element provided on the top of the antenna gantry opposite the second marker; Initially set by the pixel number initial setting unit and the pixel number initial setting unit for initial setting of the number of pixels used for calculating the centroid position of the image with respect to the first and second marker images captured by the second image sensor. The center-of-gravity position calculation unit that calculates the center-of-gravity position of the first and second marker images based on the closest number of pixels in the number of pixels, and the center-of-gravity position of the first and second markers calculated by the center-of-gravity position calculation unit Based on A displacement inclination calculator that calculates the left and right parallel displacement and inclination of the upper part of the gantry, and a directivity that calculates the antenna pointing error based on the left and right parallel displacement and inclination of the upper part of the antenna gantry calculated by the displacement inclination calculator And an error calculation unit.
[0015]
An antenna device according to the present invention is configured to face a main reflector support frame that supports a main reflector panel of an antenna, a first marker that represents a position provided at a tip of the main reflector support frame, and a first marker. A first imaging device provided at the bottom of the center hub that supports the main reflector support framework, a second marker that represents a position provided at the bottom of the center hub that supports the main reflector support framework, The center of gravity position of the image with respect to the images of the second imaging element provided at the tip of the main reflector support frame facing the marker and the first and second markers imaged by the first and second imaging elements. Based on the pixel number initial setting unit for initial setting of the number of pixels used for calculation and the closest pixel number among the pixel numbers initially set by the pixel number initial setting unit, the barycentric positions of the first and second marker images are determined. Center of gravity position calculation part to calculate and center of gravity position calculation Based on the calculated position of the marker by, those and a displacement calculation unit for calculating a displacement of the main reflecting mirror supporting framework.
[0016]
An antenna device according to the present invention is provided at a sub-reflecting mirror support portion that supports a sub-reflecting mirror of an antenna device including a main reflecting mirror and a sub-reflecting mirror, and a joint portion between the sub-reflecting mirror and the sub-reflecting mirror support mechanism. A first marker representing a position; a first imaging element provided at a joint between the main reflecting mirror and the sub reflecting mirror support mechanism facing the first marker; a main reflecting mirror and a sub reflecting mirror support mechanism; A second marker representing a position provided at the joint portion, a second imaging element provided at the joint portion between the sub-reflecting mirror and the sub-reflecting mirror support mechanism facing the second marker, and the first and first Initially set by the pixel number initial setting unit and the pixel number initial setting unit for initial setting of the number of pixels used to calculate the center of gravity position of the image for the first and second marker images captured by the two image sensors Based on the closest number of pixels in the number of pixels, the centroid position of the first and second marker images is calculated. And a displacement calculator that calculates the displacement of the sub-reflector from the main reflector based on the centroid positions of the first and second markers calculated by the centroid position calculator. .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described.
Embodiment 1 FIG.
A displacement measuring instrument according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 10 to 13. FIG. 1 is a configuration diagram illustrating an example of a displacement measuring instrument according to the first embodiment. FIGS. 10 and 11 are diagrams showing an example of the noise of the displacement measuring device, and FIGS. 12 and 13 are diagrams showing an example of a calculation result for explaining the effect.
[0018]
As shown in FIG. 1, the displacement measuring apparatus according to the first embodiment takes an image of a measured part 1 for measuring displacement, a measurement reference part 2 as a measurement reference, a laser pointer 3 for generating a marker, and an image of the laser pointer 3. A two-dimensional image sensor 4 that performs the calculation, a center-of-gravity position calculation unit 6 that calculates the position of the center of gravity of the laser light from the laser pointer 3 based on the image data 5 that is output from the image sensor 4, and A displacement calculation unit 8 for calculating the displacement is provided.
[0019]
The position of the laser beam measured by the image sensor 4 is measured by a pixel on the image sensor 4 if the laser beam from the laser pointer 3 is sufficiently thin, and this pixel position is calculated as a centroid position. What is necessary is just to output from the part 6. However, the laser light spot of the laser pointer 3 is actually larger than the pixel size of the image sensor 4, and the laser light is irradiated over a plurality of pixels of the image sensor 4. In this case, the center of gravity position calculation unit 6 determines the center of gravity of which pixel on the image sensor 4 is irradiated with the laser light. As a method for obtaining the barycentric position of the laser beam, there is a method in which a point where the sum of products of the output value of the image sensor 4 and the distance from the central position in each pixel is 0 is set as the barycentric position (centroid pixel). For example, when the output of the image sensor 4 is expressed by 1 and 0, the barycentric position of the laser light is the face center position of the laser light irradiation range.
[0020]
Furthermore, the following centroid position calculation method is used to solve the problem that the centroid position of the marker fluctuates because the laser beam is unstable during measurement and the beam shape changes, but the measurement location is not displaced. .
[0021]
In order to remove the beam noise as described above, a predetermined value of the output of each pixel of the image sensor 4 is used as a threshold value, and the barycentric position is calculated only with pixels having an output value equal to or higher than the threshold value. Moreover, when calculating the gravity center position of the continuous acquisition image of the image sensor 4 continuously, it carries out as follows. That is, in order from the highest luminance of the acquired pixel, pixels are extracted within the range of the number of pixels closest to the initial setting number within the initial setting number, and the marker having the lowest luminance value of the extracted pixel is set as a threshold value. Calculate the center of gravity. It should be noted that the pixel extraction may be performed not in the initial set number but in a range closest to that number.
[0022]
A method for initially setting the number of pixels used for calculating the center of gravity when calculating the center of gravity of continuously acquired images of the image sensor 4 to a predetermined number will be described below.
When calculating the position of the center of gravity, if the number of pixels to be calculated is too small, it is affected by high frequency noise as shown in FIG. Accordingly, a predetermined number is initially set to be equal to or more than the number of pixels necessary for removing high frequency noise. Further, when the number of pixels to be calculated is large, it is affected by noise (second peak) as shown in FIG. A predetermined number is initially set to be equal to or less than the number of pixels having a luminance value equal to or higher than the luminance value of the second peak (noise). Therefore, the predetermined number is preferably set to a value that satisfies both of the above.
[0023]
As described above, FIG. 12 shows the result of calculation by the method of initializing the number of pixels to a predetermined number and calculating based on the closest number of pixels within the initial set number. It turns out that it is stable compared with FIG. 13 which is the result of calculation by the conventional method. For example, the transition width in the X-axis direction of the center of gravity position in FIG. 13B is 2.5 pixels, whereas the transition width in the X-axis direction of the center of gravity position in FIG. ing. In addition, it can be seen that the portion A in FIG. 12C is smoother than the portion B in FIG. 13C, and the influence of high frequency noise can be removed.
[0024]
12 (a) and 13 (a) show the movement state of the center of gravity position with respect to time on the XY plane, and FIGS. 12 (b) and 13 (b) show the center of gravity position. FIG. 12C and FIG. 13C are examples of measurement showing the movement state of the center of gravity position Y method with respect to the passage of time.
[0025]
Embodiment 2. FIG.
A parallel displacement inclination measuring instrument according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 2 is a block diagram showing an example of the parallel displacement inclination measuring instrument according to the second embodiment. FIG. 3 is a schematic diagram showing the principle of the parallel displacement tilt measuring device, showing the initial setting state, and FIG. 4 showing the state in which the parallel displacement tilt measuring device shown in FIG. FIG. 5 shows a case where the parallel displacement inclination measuring instrument shown in FIG.
[0026]
As shown in FIG. 2, the parallel displacement inclination measuring apparatus according to the second embodiment includes a measured part 10 that measures displacement and inclination, a measurement reference part 11 that is a measurement reference, laser pointers 12 a and 12 b that generate markers, Two-dimensional image sensors 13a and 13b that capture images of the laser pointers 12a and 12b, a centroid position calculation unit 15a that calculates a centroid position of laser light from the laser pointer 12b from image data 14a output from the image sensor 13a, and an image sensor A center-of-gravity position calculation unit 15b that calculates the center-of-gravity position of the laser beam of the laser pointer 12a from the image data 14b output by 13b (referred to as the center-of-gravity position calculation unit 15 including the center-of-gravity position calculation unit 15a and the center-of-gravity position calculation unit 15b), The gravity center position data 16a calculated by the position calculation unit 15a and the gravity center position calculation unit 15b are calculated. Composed of a gravity center position data 16b includes a displacement tilt calculation unit 17 for calculating the inclination and the displacement of the measured portion 10.
[0027]
The image sensors 13a and 13b detect the positional displacement of the laser beam on a two-dimensional plane. The laser pointer 12a and the image sensor 13b are used as one measurement system, and the laser pointer 12b and the image sensor 13a are used as another measurement system. The two measurement systems are arranged so that the laser beams are irradiated in opposite directions. That is, one laser pointer 12a and one image sensor 13a are arranged in the measured part 10, and one laser pointer 12b and one image sensor 13b are arranged in the measurement reference part 11, respectively.
[0028]
Next, the principle of measuring displacement and inclination will be described.
FIG. 3 shows an initial state of installation of the parallel displacement inclination measuring device, in which an image 18a is obtained by the image sensor 13a and an image 18b is obtained by the image sensor 13b. In a state where the optical axes coincide with each other, the position of the laser beam in the image 18a is P2 (0, 0), while the position of the laser beam in the image 18b is also P1 (0, 0). From this state, the displacement amount ΔX when the measured part 10 is displaced in parallel and the tilt angle Δθy when tilted are calculated separately.
[0029]
First, when the measured part 10 is displaced by ΔX in the X-axis direction as shown in FIG. 4, the position of the laser beam of the image 18a is P2 (X2 (= −a), Y1 (= 0)), Assuming that the position of the laser beam of the image 18b is P1 (X1 (= a), Y1 (= 0)), the displacement amount ΔX is expressed by Expression (1).
ΔX = X1 = −X2 (1)
[0030]
Further, when the measured portion 10 is rotated by Δθy about the Y axis as shown in FIG. 5, when the distance L between the measured portion 10 and the measurement reference portion 11 is sufficiently large, only the value X2 of the image 18a is obtained. Changes, and Δθy is expressed by Equation (2).
tan (Δθy) = (X2 / L) (2)
[0031]
Accordingly, when the displacement amount ΔX and the rotation angle Δθy are generated at the same time, they are expressed by Expression (3) and Expression (4), respectively.
ΔX = X1 (3)
tan (Δθy) = (X1 + X2) / L (4)
Therefore, Δθy is expressed by equation (5).
Δθy = tan ^-1 [(X1 + X2) / L] (5)
As described above, the parallel displacement can be obtained by the equation (3), and the rotation can be obtained by the equation (5).
[0032]
The position of the laser beam measured by the image sensor 13a and the image sensor 13b is determined by the pixels on the image sensor 13a and the image sensor 13b if the laser beam from the laser pointer 12a and the laser pointer 12b is sufficiently thin. The position is measured, and the pixel position may be output from the centroid position calculation unit 15a and the centroid position calculation unit 15b. However, actually, the laser light spot of the laser pointers 12a and 12b is larger than the pixel size of the image sensors 13a and 13b, and the laser light is irradiated over a plurality of pixels of the image sensors 13a and 13b. In this case, the center-of-gravity position is calculated by the center-of-gravity position calculators 15a and 15b as means for determining which pixel on the image sensors 13a and 13b is irradiated with the laser beam.
[0033]
As a method for obtaining the barycentric position of the laser beam, there is a method in which a point where the sum of products of the output values of the image sensors 13a and 13b and the distance from the center position in each pixel is 0 is set as the barycentric position (centroid pixel). . For example, when the output of the image sensor is expressed by 1 and 0, the barycentric position of the laser light is the face center position of the irradiation range of the laser light.
[0034]
Furthermore, in order to solve the problem that the center of gravity of the marker fluctuates because the laser beam is unstable during measurement and the beam shape changes, the output value at each pixel of the image sensor When using the method of calculating the centroid position with only pixels having an output value equal to or greater than the threshold value, and calculating the centroid position of continuously acquired images of the image sensor, as follows: Do. That is, in order from the highest luminance of the acquired pixel, pixels are extracted within the range of the number of pixels closest to the initial setting number within the initial setting number, and the marker having the lowest luminance value of the extracted pixel is set as a threshold value. Calculate the center of gravity. It should be noted that the pixel extraction may be performed not in the initial set number but in a range closest to that number.
[0035]
A method for initially setting the number of pixels used for calculating the center of gravity when calculating the center of gravity of continuously acquired images of the image sensor to a predetermined number will be described below.
When calculating the position of the center of gravity, if the number of pixels to be calculated is too small, as described in the first embodiment, it is affected by high frequency noise as shown in FIG. Accordingly, a predetermined number is initially set to be equal to or more than the number of pixels necessary for removing high frequency noise. Further, when the number of pixels to be calculated is large, it is affected by noise (second peak) as shown in FIG. A predetermined number is initially set to be equal to or less than the number of pixels having a luminance value equal to or higher than the luminance value of the second peak (noise). Therefore, the predetermined number is preferably set to a value that satisfies both of the above.
[0036]
As described above, the number of pixels is initially set to a predetermined number, and the calculation result based on the calculation method based on the closest number of pixels within the initially set number is as shown in FIG. 12 and FIG. This is the same as described, and shows the same effect.
[0037]
Embodiment 3 FIG.
An antenna device according to Embodiment 3 of the present invention will be described with reference to FIGS. FIG. 6 is a block diagram showing an example of an antenna device according to Embodiment 3 of the present invention, and FIG. 7 is a block diagram of a control unit of this antenna device.
[0038]
As shown in FIG. 6, the antenna device according to the third embodiment controls the elevation angle axis (EL axis) 19 of the antenna 9 and the azimuth axis (AZ axis) 20 of the antenna 9 independently. EL shaft bearings 21a and 21b provided above, AZ shaft bearing 22, antenna mount 23 positioned below EL shaft bearings 21a and 21b, upper portions 23a and 23b having antenna support portions of antenna mount 23, AZ shaft bearing 22 Are provided with bottom portions 24a and 24b having an antenna mount attachment portion of the antenna mount 23, a laser pointer 25 serving as a marker, and a two-dimensional image sensor 26 for capturing an image of the laser pointer 25.
[0039]
The EL shaft bearings 21 a and 21 b support the antenna base 23 so that the antenna 9 can rotate about the elevation axis 19. The AZ-axis bearing 22 supports the antenna mount 23 so as to be rotatable around the azimuth axis 20. The laser pointer 25 and the image sensor 26 are provided at four locations of the upper portions 23a and 23b and the bottom portions 24a and 24b of the antenna mount 23. The set of the laser pointer 25 and the image sensor 26 that irradiates the laser beam is one set up and down as shown by the dotted line with an arrow in FIG.
[0040]
As shown in FIG. 7, the control unit of the antenna device according to the present invention includes a center-of-gravity position calculation unit 15, a displacement inclination calculation unit 17, a pointing error calculation unit 29, an antenna drive unit 30, a sub-reflecting mirror drive unit 31, a high-speed drive mirror. A drive unit 32 is provided.
[0041]
Explaining the operation, the image data 27 from the four image sensors 26 is input to the gravity center position calculation unit 15 to calculate the gravity center position data 16. The calculated center-of-gravity position data 16 is input to the displacement inclination calculation unit 17, and displacement and inclination data 28 of the upper portions 23a and 23b of the antenna mount 23 are obtained. Next, the displacement and inclination data 28 is input to the pointing error calculation unit 29, and the pointing error is calculated. Based on the directivity error calculated by the directivity error calculator 29, the antenna drive unit 30 that drives the antenna 9 around the elevation angle axis 19 and the azimuth angle 20, the sub-reflector drive unit 31 that drives the sub-reflector, and the directivity direction are determined. The high-speed drive mirror drive unit 32 that drives the mirror that can be driven at high speed is driven, and the attitude of the antenna 9 is controlled.
[0042]
In the third embodiment, the measurement reference portion is the bottom portions 24a and 24b of the antenna mount 23 with little deformation causing an antenna pointing error, and the measurement target portion is the upper portions 23a and 23b of the antenna mount 23. A laser pointer 25 and an image sensor 26 are arranged at each of the upper parts 23a and 23b and the bottom parts 24a and 24b, and are provided to face each other between the measurement reference part and the part to be measured. As a set of upper and lower laser pointers and image sensors connected by dotted lines, two sets are provided on the left and right sides of the antenna mount 23, for a total of four sets.
[0043]
By providing the laser pointer 25 and the image sensor 26 as described above, it is possible to calculate the parallel displacement and inclination of the respective parts to be measured on the left and right of the antenna mount 23, that is, the upper portions 23a and 23b of the antenna mount 23. it can. For example, if the top 23a and the bottom 24a of the antenna mount 23 are viewed, the parallel displacement inclination measuring instrument shown in FIG. 2 is constructed, and the means and method for calculating the parallel displacement and inclination of the part to be measured by this measuring instrument. Is as described in the second embodiment. The same applies to the upper part 23b and the bottom part 24b of the antenna mount 23.
[0044]
The pointing error calculation unit 29 calculates an antenna pointing error based on the parallel displacement and the inclination measured and calculated in the upper parts 23a and 23b of the antenna mount 23. Assuming Δθxa and Δθxb that are the inclination amounts around the X axis (around the elevation axis) measured and calculated at the upper portions 23a and 23b of the antenna mount 23, the directivity error θx around the EL axis and the directivity error θz around the AZ axis Are calculated by equation (6) and equation (7), respectively.
θx = (Δθxa + Δθxb) / 2 (6)
θz = (Δθxa−Δθxb) / 2 (7)
[0045]
Based on the pointing error calculated as described above, the antenna driving unit 30 feedback-drives the antenna around the elevation angle axis 19 and the azimuth angle 20 to correct the pointing error. Also, for directivity errors that change at high frequencies, the sub-reflector driving unit 31 that drives the sub-reflector having a smaller mass and sensitivity moment than the antenna 9 and the antenna mount 23 or the high-speed drive mirror is driven. The high-speed drive mirror drive unit 32 that performs the feedback drive of these mirrors can correct the pointing error.
[0046]
When the antenna device as described above is subjected to thermal deformation of the entire antenna device or deformation due to wind pressure, parallel displacement and inclination occur in the upper portions 23a and 23b of the antenna mount 23, and the antenna is caused by the parallel displacement and inclination. However, it is possible to control the pointing direction based on the calculated pointing error.
[0047]
Embodiment 4 FIG.
An antenna device according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing an example of an antenna apparatus according to Embodiment 4 of the present invention.
[0048]
As shown in FIG. 8, the antenna device according to the fourth embodiment includes a main reflecting mirror 9a, a main reflecting mirror frame 41 that supports the main reflecting mirror 9a, a center hub 42 that supports the main reflecting mirror frame 41, a measured part, An upper part 43a and 43b of the main reflecting mirror 9a, a bottom part 44a and 44b of the center hub 42 as a measurement reference part, a laser pointer 45 for generating a marker, and a two-dimensional image sensor 46 for taking an image of the laser pointer 45. Composed. The laser pointer 45 and the image sensor 46 are provided at a total of four locations, ie, the upper portions 43 a and 43 b of the main reflecting mirror and the bottom portions 44 a and 44 b of the center hub 42. The pair of the laser pointer 45 and the image sensor 46 that irradiates the laser beam is one set at the top and bottom as shown by the dotted line with an arrow in FIG.
[0049]
By providing the laser pointer 45 and the image sensor 46 in this way, it is possible to calculate the parallel displacement and inclination of the measured part of the main reflecting mirror 9a, that is, the upper portions 43a and 43b of the main reflecting mirror 9a. For example, if the upper parts 43a and 43b of the main reflecting mirror 9a and the bottom parts 44a and 44b of the center hub 42 are viewed, the parallel displacement inclination measuring instrument shown in FIG. 2 is formed. The means and method for calculating the inclination are as described in the second embodiment.
[0050]
When the antenna device as described above undergoes thermal deformation of the entire antenna device or deformation due to wind pressure, parallel displacement or inclination occurs in the upper portions 43a and 43b of the main reflecting mirror 9a. Although it is considered that the directivity direction of the antenna changes, the directivity direction can be controlled based on the calculated directivity error.
[0051]
Embodiment 5 FIG.
An antenna apparatus according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 9 is a block diagram showing an example of an antenna apparatus according to Embodiment 5 of the present invention.
[0052]
As shown in FIG. 9, the antenna device according to the fifth embodiment includes a main reflecting mirror 9b, a sub-reflecting mirror 50, a sub-reflecting mirror support mechanism 51 that supports the sub-reflecting mirror 50, and a sub-reflecting mirror support that is a part to be measured. Laser pointers that generate upper and lower portions 52a and 52b of the mechanism 51, lower portions 53a and 53b of the sub-reflecting mirror support mechanism 51 serving as a measurement reference portion, and located at the joint between the sub-reflecting mirror support mechanism 51 and the main reflecting mirror 9b. 54, a two-dimensional image sensor 55 for taking an image of the laser pointer. The laser pointer 54 and the image sensor 55 are provided at a total of four locations: upper portions 52a and 52b of the sub-reflecting mirror support mechanism 51, and lower portions 53a and 53b corresponding to a joint portion between the sub-reflecting mirror support mechanism 51 and the main reflecting mirror 9b. Yes. The set of the laser pointer 54 and the image sensor 55 that irradiates the laser beam is one set up and down as shown by the dotted line with an arrow in FIG.
[0053]
By providing the laser pointer 54 and the image sensor 55 in this way, the parallel displacement and inclination of each of the measurement target portion of the sub-reflecting mirror support mechanism 51, that is, the upper portions 52a and 52b of the sub-reflecting mirror support mechanism 51 are calculated. Can do. For example, if the upper portions 52a and 52b of the sub-reflecting mirror support mechanism 51 and the lower portions 53a and 53b corresponding to the joint portion between the sub-reflecting mirror support mechanism 51 and the main reflecting mirror 9b are viewed, the parallel displacement inclination measuring device shown in FIG. The means and method for calculating the parallel displacement and the inclination of the part to be measured by this measuring instrument are as described in the second embodiment.
[0054]
When the antenna device as described above undergoes thermal deformation of the entire antenna device or deformation due to wind pressure, parallel displacement or inclination occurs in the upper portions 52a and 52b of the reflector support mechanism 51. Although it is considered that the directivity direction of the antenna changes due to, the directivity direction can be controlled based on the calculated directivity error.
[0055]
【The invention's effect】
As described above, according to the present invention, because of the simple configuration in which the marker and the image sensor are arranged to face the measured part and the measurement reference part, there are few restrictions on the arrangement of these measuring instruments, An inexpensive marker that is easy to change the beam shape by measuring displacement and calculating the barycentric position based on the closest number of pixels within the initially set number of pixels. Can also be used, so that an inexpensive system can be achieved.
[0056]
According to the present invention, since the marker and the image sensor are arranged facing each other at the top and bottom of the antenna mount, there are few restrictions on the placement of these measuring instruments, and the displacement of the top of the antenna mount can be measured. The antenna directivity error can be calculated with higher accuracy, and the directivity can be controlled.
[0057]
According to the present invention, the main reflector support frame that supports the main reflector panel, the tip of the main reflector support frame, and the bottom of the center hub that supports the main reflector support frame, respectively, are opposed to the marker. Since the image sensor is placed, there are few restrictions on the placement of these measuring instruments, the displacement of the main reflector support frame can be measured, and the pointing error of the antenna is calculated with higher accuracy to control the pointing. There is an effect that can be done.
[0058]
According to the present invention, the marker and the image sensor are arranged to face each other at the joint portion between the sub-reflector support mechanism and the sub-reflector and the joint portion between the sub-reflector support mechanism and the main reflector. There are few restrictions on the arrangement of the measuring instruments, the displacement of the sub-reflecting mirror can be measured, and there is an effect that the pointing can be controlled by calculating the pointing error of the antenna with higher accuracy.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an example of a displacement measuring instrument according to Embodiment 1 of the present invention.
FIG. 2 is a configuration diagram showing an example of a parallel displacement inclination measuring instrument according to Embodiment 2 of the present invention.
FIG. 3 is a schematic diagram showing the principle of a parallel displacement inclination measuring instrument according to Embodiment 2 of the present invention.
FIG. 4 is a schematic diagram showing the principle of a parallel displacement tilt measuring instrument according to Embodiment 2 of the present invention.
FIG. 5 is a schematic diagram showing the principle of a parallel displacement tilt measuring instrument according to Embodiment 2 of the present invention.
FIG. 6 is a block diagram showing an example of an antenna apparatus according to Embodiment 3 of the present invention.
FIG. 7 is a block diagram showing a configuration of a control unit of an antenna apparatus according to Embodiment 3 of the present invention.
FIG. 8 is a configuration diagram illustrating an example of an antenna device according to a fourth embodiment of the present invention.
FIG. 9 is a block diagram showing an example of an antenna apparatus according to Embodiment 5 of the present invention.
FIG. 10 is a diagram showing an example of high-frequency noise according to Embodiments 1 and 2 of the present invention.
FIG. 11 is a diagram showing an example of noise according to the first and second embodiments of the present invention.
FIG. 12 is a diagram showing an example of a calculation result for explaining the effect of the present invention.
FIG. 13 is a diagram showing an example of a calculation result by a conventional method for comparison with the effect of the present invention.
[Explanation of symbols]
1,10,43a, 43b measured part, 2,11 measurement reference part, 3,12a, 12b, 25,45,54 laser pointer, 4,13a, 13b, 26,46,55 image sensor (imaging device), 5, 14a, 14b, 27 Image data, 6, 15 Center of gravity position calculation unit, 7, 16, 16a, 16b Center of gravity position data, 8 displacement calculation unit, 9 Antenna, 9a, 9b Main reflector, 15a, 15b Center of gravity position detection Part, 17 displacement inclination calculating part, 18a, 18b image, 19 elevation angle axis, 20 azimuth axis, 21a, 21b EL axis bearing, 22 AZ axis bearing, 23 antenna mount, 23a, 23b upper part, 24a, 24b bottom part, 28 displacement and Tilt data, 29 Directional error calculation unit, 30 Antenna drive unit, 31 Sub reflector drive unit, 32 High speed drive mirror drive unit, 41 Main reflector frame, 42 Ntahabu, 44a, 44b center hub bottom, 50 sub-reflecting mirror, 51 secondary reflecting mirror support mechanism, 52a, 52 b upper, 53a, 53b lower.

Claims (10)

A measurement reference part with a marker indicating the position;
An image sensor provided in a measured part facing the marker;
A pixel number initial setting unit that initially sets the number of pixels used to calculate the position of the center of gravity of the image with respect to the image of the marker imaged by the image sensor;
A center-of-gravity position calculation unit that calculates the center-of-gravity position of the image of the marker based on the closest number of pixels in the number of pixels initially set by the pixel number initial setting unit;
A displacement measuring device comprising: a displacement calculating unit that calculates a displacement of the measured portion based on the center of gravity position of the marker calculated by the center of gravity position calculating unit. The center-of-gravity position calculating unit calculates the center-of-gravity position of the marker image based on the number of pixels closest to the initially set number of pixels in the vicinity of the number of pixels initially set by the pixel number initial setting unit. The displacement measuring instrument according to claim 1. The pixel number initial setting unit is used to remove the high frequency noise of the marker when the number of pixels used for calculating the center of gravity position of the image is equal to or less than the number of pixels having a luminance value equal to or higher than the luminance value of the second peak in the beam profile of the marker. 3. The displacement measuring device according to claim 1, wherein the displacement measuring device is a means for initial setting more than a necessary number of pixels. A measurement reference unit having a first marker representing a position;
A part to be measured having a second marker representing a position;
A first imaging device provided in the measured part opposite to the first marker;
A second imaging device provided in the measurement reference unit facing the second marker;
A pixel number initial setting unit that initially sets the number of pixels used to calculate the position of the center of gravity of the image with respect to the images of the first and second markers imaged by the first and second imaging elements;
A center-of-gravity position calculation unit that calculates the center-of-gravity position of the images of the first and second markers based on the closest number of pixels among the number of pixels initially set by the pixel number initial setting unit;
A parallel displacement inclination measuring device comprising: a displacement inclination calculating section that calculates a displacement and an inclination of the measured part based on the position of the center of gravity of the marker calculated by the gravity center position calculating section. The pixel number initial setting unit is used to remove the high frequency noise of the marker when the number of pixels used for calculating the center of gravity position of the image is equal to or less than the number of pixels having a luminance value equal to or higher than the luminance value of the second peak in the beam profile of the marker. 5. The parallel displacement inclination measuring device according to claim 4, wherein the parallel displacement inclination measuring device is a means for initial setting at a required number of pixels or more. An antenna mount that supports the elevation drive shaft of the antenna;
A first marker representing a position provided on an upper portion of the antenna mount;
A first imaging device provided at the bottom of the antenna mount facing the first marker;
A second marker representing a position provided at the bottom of the antenna mount;
A second imaging device provided on an upper portion of the antenna mount so as to face the second marker;
A pixel number initial setting unit that initially sets the number of pixels used to calculate the position of the center of gravity of the image with respect to the images of the first and second markers imaged by the first and second imaging elements;
A center-of-gravity position calculation unit that calculates the center-of-gravity position of the images of the first and second markers based on the closest number of pixels among the number of pixels initially set by the pixel number initial setting unit;
An antenna apparatus comprising: a displacement inclination calculation unit that calculates parallel displacement and inclination of the upper part of the antenna mount based on the gravity center positions of the first and second markers calculated by the gravity center position calculation unit . An antenna mount that supports the elevation drive shaft of the antenna;
A first marker representing a position provided on an upper portion of the antenna mount;
A first imaging element provided at the bottom of the antenna mount facing the first marker;
A second marker representing a position provided at the bottom of the antenna mount;
A second imaging element provided on an upper portion of the antenna mount so as to face the second marker;
A pixel number initial setting unit that initially sets the number of pixels used to calculate the position of the center of gravity of the image with respect to the images of the first and second markers imaged by the first and second imaging elements;
A center-of-gravity position calculation unit that calculates the center-of-gravity position of the images of the first and second markers based on the closest number of pixels among the number of pixels initially set by the pixel number initial setting unit;
A displacement inclination calculation unit that calculates left and right parallel displacement and inclination of the upper part of the antenna mount based on the gravity center positions of the first and second markers calculated by the gravity center position calculation unit;
An antenna apparatus comprising: a pointing error calculation unit that calculates a pointing error of the antenna based on a parallel displacement and a tilt on the left and right of the upper part of the antenna mount calculated by the displacement tilt calculation unit. 8. The antenna driving unit according to claim 7, further comprising: an antenna driving unit configured to drive the antenna around an azimuth angle or an elevation axis based on the antenna pointing error calculated by the pointing error calculation unit and to correct the pointing direction of the antenna. Antenna device. A main reflector support framework for supporting the main reflector panel of the antenna;
A first marker representing a position provided at the tip of the main reflector support frame;
A first imaging device provided at a bottom portion of a center hub that supports the main reflector supporting frame facing the first marker;
A second marker representing a position provided at the bottom of a center hub that supports the main reflector support framework;
A second imaging element provided at the front end of the main reflector support frame facing the second marker;
A pixel number initial setting unit that initially sets the number of pixels used to calculate the position of the center of gravity of the image with respect to the images of the first and second markers imaged by the first and second imaging elements;
A center-of-gravity position calculation unit that calculates the center-of-gravity position of the images of the first and second markers based on the closest number of pixels among the number of pixels initially set by the pixel number initial setting unit;
An antenna device comprising: a displacement calculation unit that calculates a displacement of the main reflector support frame based on a marker position calculated by the gravity center position calculation unit. A sub-reflecting mirror support unit that supports the sub-reflecting mirror of the antenna device including the main reflecting mirror and the sub-reflecting mirror;
A first marker representing a position provided at a joint between the sub-reflecting mirror and the sub-reflecting mirror support mechanism;
A first imaging device provided at a joint between the main reflecting mirror and the sub-reflecting mirror support mechanism so as to face the first marker;
A second marker representing a position provided at a joint between the main reflecting mirror and the sub reflecting mirror support mechanism;
A second imaging element provided at a joint portion between the sub-reflecting mirror and the sub-reflecting mirror support mechanism facing the second marker;
A pixel number initial setting unit that initially sets the number of pixels used to calculate the position of the center of gravity of the image with respect to the images of the first and second markers imaged by the first and second imaging elements;
A center-of-gravity position calculation unit that calculates the center-of-gravity position of the images of the first and second markers based on the closest number of pixels among the number of pixels initially set by the pixel number initial setting unit;
An antenna device comprising: a displacement calculating unit that calculates a displacement of the sub-reflecting mirror from the main reflecting mirror based on the gravity center positions of the first and second markers calculated by the gravity center calculating unit. .

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