JP2009065453A - Antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the generation of a problem in a directional accuracy, when a sub-reflector is displaced by an insolation, own deformation, or the like, even if a high directional accuracy in a telescope and an antenna is demanded. <P>SOLUTION: A reference frame 11 is fitted in the internal spaces of a main-reflector support section 2 and a sub-reflector support section 4 and around a sub-reflector 3. A sub-reflector supporting-section displacement sensor 12 measuring the displacement on the main reflector side of the sub-reflector support section and a sub-reflector displacement sensor 13 measuring the displacement of the sub-mirror side of the sub-reflector support section or the sub-reflector are fitted to the reference frame. The displacement of the sub-reflector is measured, a sub-reflector drive mechanism 5 and AZ/EL drive mechanisms 8 and 10 are driven, on the basis of the displacement, and the directional error of the sub-reflector and the directional error by the displacement due to the sub-reflector are corrected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antenna device that can measure and correct displacement and deformation of an antenna device that requires precise reflection surface accuracy, pointing accuracy, and tracking accuracy in the field of astronomical observation and communication. is there.

  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 beam direction and focal position of the telescope beam. On the other hand, in order to increase the observation efficiency, the diameter of the telescope has been increased, and it is desired that the observation can be performed in all weathers day and night. As the aperture increases, the deformation of the telescope increases, and when the wind is strong during the day, thermal deformation due to solar radiation and deformation of the telescope structure due to wind pressure increase. It becomes difficult. In order to achieve both the requirements for high directivity and focus position accuracy, large aperture, and 24-hour all-weather telescope, the position of the sub-reflector of the telescope, parallel displacement and rotational displacement, main reflection A system for measuring and correcting the deviation of the focal position due to the deformation of the mirror in real time is required.

  ANTENNA APPARATUS HAVING A MAIN REFLECTOR, A MAIN REFLECTOR SUPPORTING UNIT SUPPORTING THE MAIN REFLECTING Mirror, A SUB-REFLECTING Mirror, A SUB-REFLECTING Mirror SUPPORTING SUPPORT FOR SUPPORTING THE SUB-REFLING Mirror, AND AN ANTENNA MOUNT SUPPORTING THE MAIN REFLECTING Mirror , An optical fiber is laid on the main reflector, main reflector support part and sub-reflector support part, incident light is incident on this optical fiber, and scattered light generated at each part of the optical fiber is detected to detect the main reflector and main reflector. Measure the distortion generated in the mirror support part and sub-reflecting mirror support part, calculate correction data from this distortion, and drive the EL axis driving part, AZ axis driving part and sub-reflecting mirror driving part to correct the pointing error However, an antenna that corrects the direction of the antenna has been proposed. (See Patent Document 1)

JP 2004-7437 A

Since the conventional antenna apparatus is configured as described above, the optical fiber must be laid on the main reflector and the sub-reflector support part at the time of construction of the telescope, and fixed and installed at several places. These installation operations are very difficult and require labor. In addition, if the optical fiber is cut for some reason after the assembly of the telescope is completed, it is very difficult to re-install in places that are difficult to access after construction, such as in the sub-reflector support part. is there.
In addition, optical fiber can only measure one-dimensional displacement of expansion and contraction. For example, when trying to measure three-dimensional displacement around the sub-reflector, the optical fiber is stretched in various directions, and the sub-reflector is displaced from the output of the optical fiber. A model to be estimated must be created and calculated, and such displacement measurements are subject to errors.

  The present invention solves such difficulty in installation and maintainability, and obtains an antenna device capable of measuring and correcting a pointing error due to displacement of a main reflecting mirror and a sub reflecting mirror with high accuracy. With the goal.

  The present invention relates to a main reflecting mirror, a main reflecting mirror support section that supports the main reflecting mirror, a sub reflecting mirror, a sub reflecting mirror support section that supports the sub reflecting mirror and is attached to the main reflecting mirror or the main reflecting mirror support section. And an antenna device having an antenna mount for supporting the main reflector support, and a reference frame provided in the internal space of the main reflector support section and the sub reflector support section and around the sub reflector, and a reference frame A sub-reflector support unit displacement sensor that measures the displacement of the base reflector side of the sub-reflector support unit installed, and a displacement of the sub-reflector side or sub-reflector side of the sub-reflector support unit installed on the reference frame Sub-reflector displacement sensor to measure the position of the sub-reflector from the output values of the sub-reflector support sensor and the sub-reflector displacement sensor A measurement calculation unit for calculating a position correction value is obtained by a secondary reflecting mirror driving unit for correcting the position of the sub-reflecting mirror based on the sub-reflecting mirror correction value calculated by the measurement calculation unit.

  The present invention also provides a main reflecting mirror, a main reflecting mirror support portion that supports the main reflecting mirror, a sub reflecting mirror, a sub reflecting mirror support that supports the sub reflecting mirror and is attached to the main reflecting mirror or the main reflecting mirror support portion. And an antenna device having an antenna mount for supporting the main reflector support section, a reference frame provided in the internal space of the main reflector support section and the sub reflector support section and around the sub reflector, and a reference frame A sub-reflector support part displacement sensor for measuring the displacement of the base reflector side base of the sub-reflector support part, and a sub-reflector side or sub-reflector side of the sub-reflector support part installed in the reference frame. The position of the sub-reflector is calculated from the output values of the sub-reflector displacement sensor for measuring the displacement, the sub-reflector support displacement sensor, and the sub-reflector displacement sensor. EL based on the measurement calculation unit that calculates the correction value, the AZ axis drive mechanism that corrects the AZ axis direction based on the directional correction value calculated by the measurement calculation unit, and the directional correction value calculated by the measurement calculation unit And an EL axis drive mechanism that corrects the orientation of the axis.

  According to this invention, the sub-reflector support part displacement sensor and the sub-reflector displacement sensor are installed on the reference frame which is a stable structure, and the position of the sub-reflector or the main reflector is corrected from the displacement of each sensor. Therefore, it is possible to greatly improve the ease of installation and maintainability of the sensor and to obtain an antenna device with high pointing accuracy. Further, since the sensor can be a three-dimensional position sensor, the displacement of the sub-reflecting mirror can be measured with higher accuracy.

Embodiment 1 FIG.
Hereinafter, an antenna device according to Embodiment 1 of the present invention will be described with reference to the drawings. 1 is a system configuration diagram of an antenna device according to Embodiment 1 of the present invention, FIG. 2 is a detailed view of a reference frame provided in the internal space of a main reflector support portion and a sub reflector support portion, and FIG. 4 is a detailed diagram of the reference frame provided in the inner space of the mirror support section and around the sub-reflecting mirror, and FIG. 4 is a specific configuration diagram of the measurement calculation section used in Embodiment 1 of the present invention.
In FIG. 1, the main reflecting mirror 1 is configured in a parabolic shape and is supported by a main reflecting mirror support 2. The sub-reflecting mirror 3 is for further converging the radio wave reflected by the main reflecting mirror 1, is arranged at the focal position of the main reflecting mirror 1, and is supported by a plurality of sub-reflecting mirror support portions 4. The sub-reflecting mirror 3 is driven by a sub-reflecting mirror driving mechanism 5 so that its direction and position can be changed. The lower side of the sub-reflecting mirror support 4 is fixedly attached to the main reflecting mirror 1 or the main reflecting mirror support 2. The sub reflector driving mechanism 5 is supported by the upper part of the sub reflector support part 4.

  The main reflector support part 2 is fixed to the center support part 6, and the center support part 6 supports the main reflector 1 and the sub-reflector mirror 3 through the main reflector support part 2. The central support 6 is driven to rotate around the EL axis of the antenna by an EL axis driving mechanism 8 provided on the EL rotating structure 7 so that the main reflecting mirror 1 is arbitrarily driven in the EL angle (elevation angle) direction. It has become. The EL rotating structure 7 is rotationally driven around the AZ axis of the antenna by an AZ axis driving mechanism 10 provided in the AZ rotating structure 9, and the main reflecting mirror 1 is arbitrarily driven in the AZ angle (azimuth angle) direction. It is like that. An antenna mount portion is constituted by the central support portion 6, the EL rotating structure 7 and the AZ rotating structure 9.

  A main mirror reference frame serving as a reference frame for detecting displacement of the main reflecting mirror 1 and the sub reflecting mirror 3 is provided in the internal space of the main reflecting mirror support 2 and each of the internal spaces of the plurality of sub reflecting mirror supports 4. 11a and a sub-mirror stay section reference frame 11b are provided. A sub-mirror reference frame 11c serving as a reference frame for detecting the displacement of the sub-reflecting mirror 3 or the sub-reflecting mirror 3 is provided around the sub-reflecting mirror 3. At least three sub-reflector support part displacement sensors 12 are installed in the main mirror reference frame 11a disposed inside the main reflector support part 2, and the main reflector side base displacement of the sub-reflector support part 4 is displaced. Is supposed to measure. At least three sub-reflector displacement sensors 13 are installed on the sub-mirror reference frame 11c arranged around the sub-reflector 4, and the sub-reflector side of the sub-reflector support 4 or the displacement of the sub-reflector 3 is displaced. Is supposed to measure.

  In order to prevent the deformation / displacement of the main reflector 1, the main reflector support 2, the sub reflector 3, and the sub reflector 4 from being transmitted to the reference frame 11, the main mirror reference frame 11a is the main reflector. 1 and the main reflector support part 2 are supported in the internal space of the main reflector support part 2 so as not to contact directly. Similarly, the sub mirror stay part reference frame 11 b is supported in the internal space of the sub reflector support part 4 so as not to be in direct contact with each sub reflector support part 4. The sub mirror reference frame 11c is supported by the sub mirror 3 and the sub reflector driving unit 5 so as not to directly contact the sub mirror 3 and the sub mirror driving unit 5.

The relationship between the reference frames 11a, 11b, 11c and the displacement sensors 12, 13 is shown in detail in FIGS. As is clear from FIGS. 2 and 3, the main mirror reference frame 11 a is rigidly connected to and supported by the central support 6. The secondary mirror stay unit reference frame 11b is rigidly connected to the primary mirror unit reference frame 11a. Although only one sub mirror stay section reference frame 11b is shown in FIG. 2, it is provided in the internal space of each sub reflector support section 4, and has at least three. The secondary mirror reference frame 11c is rigidly connected to the secondary mirror stay reference frame 11b. Therefore, the center support portion 6 is a structure that is sufficiently rigid to support the reference frames 11 a to 11 c and the main reflector support portion 2.
The sub-reflector support part displacement sensor 12 is rigidly connected to the main mirror part reference frame 11a, and measures the displacement of the sub-reflector support part 4 at the base of the main reflector side. The sub-reflector displacement sensor 13 is rigidly connected to the sub-mirror reference frame 11c and measures the displacement of the sub-reflector side of the sub-reflector support 4 or the sub-reflector 3. One sub-reflecting mirror support part displacement sensor 12 and one sub-reflecting mirror displacement sensor 13 constitute a pair of sensors, and at least three or more pairs of sensors are provided.

  Note that the reference frames 11a, 11b, and 11c serving as the reference for displacement measurement must have a rigidity that is one digit greater than that of the main reflector support section 2 and the sub-reflector support section 4 and have a small coefficient of linear expansion. Although it does not become necessary, it uses a composite material such as carbon fiber reinforced resin (CFRP) with a small linear expansion coefficient or a super low expansion coefficient special alloy such as Super Invar to achieve a frame with low thermal expansion and high rigidity. Can be produced.

  The measurement calculation unit 14 receives the displacement data 15 output from the sub-reflecting mirror support unit displacement sensor 12 and the sub-reflecting mirror displacement sensor 13, calculates the position of the sub-reflecting mirror 3, and before and after the deformation of the sub-reflecting mirror 3. The sub-reflector position correction value 16 is calculated from the difference between the positions, and the AZ / EL drive correction value 17 is calculated. The sub-reflecting mirror position correction value 16 calculated by the measurement calculation unit 14 is input to the sub-reflecting mirror driving unit 5 to correct the position of the sub-reflecting mirror 3. The AZ / EL drive correction value 17 calculated by the measurement calculation unit 14 is input to the AZ drive mechanism 10 and the EL drive mechanism 8 to correct the pointing error of the main reflecting mirror 1.

  Hereinafter, a specific configuration diagram of the measurement calculation unit 14 will be described with reference to FIG. In FIG. 4, displacement data 15 a output from the sub-reflecting mirror support unit displacement sensor 12 and displacement data 15 b output from the sub-reflecting mirror displacement sensor 13 are input to the measurement calculation unit 14. The sub-reflecting mirror driving unit 5, the EL driving mechanism 8, and the AZ driving mechanism 10 shown in FIG. 1 are connected to the output side of the measurement calculation unit 14. In FIG. 4, displacement data 15a and 15b output from the plurality of sub-reflecting mirror support unit displacement sensors 12 and the plurality of sub-reflecting mirror displacement sensors 13 are input to a pointing error calculation unit 31, and a pointing error 32 of the telescope is calculated. The The first secondary mirror correction calculation unit (directing error) 33 receives the directing error 32 calculated by the directing error calculation unit 31 and calculates a secondary mirror position correction value (directing error) 34 for correcting the directing error. To do. The second secondary mirror correction calculation unit (posture deformation) 35 receives the primary mirror drive command value 18 such as the celestial direction, and receives the secondary mirror position correction value (posture deformation) that is an error due to its own weight deformation depending on the telescope posture. 36 is calculated. The secondary mirror drive calculation unit 37 receives the secondary mirror position correction value (directivity error) 34 and the secondary mirror position correction value (posture deformation) 36 and calculates the secondary mirror position correction value 16. Thus, the sub-reflector position correction value 16 calculated by the measurement calculation unit 14 based on the difference between the positions before and after the deformation of the sub-reflector 3 is input to the sub-reflector drive mechanism 5, and the position of the sub-reflector 3 is corrected. Errors due to pointing errors and dead weight deformation are corrected.

  The primary mirror correction calculation unit 38 receives the directivity error 32 calculated by the directivity error calculation unit 31, and calculates a primary mirror position correction value 39 that is an antenna directivity correction value based on the directivity error. The primary mirror correction calculation unit 38 includes an AZ correction calculation unit 38a and an EL correction calculation unit 38b. The primary mirror drive calculation unit 40 receives the primary mirror position correction value 39 and the primary mirror drive command value 18 calculated by the primary mirror correction calculation unit 38 and calculates the AZ / EL drive correction value 17. Among the AZ / EL drive correction values 17, the EL drive correction value 17a is input to the EL axis drive mechanism 8, the AZ drive correction value 17b is input to the AZ axis drive mechanism 10, and the antenna has a desired direction in which the pointing error is corrected. Driven by.

Next, the operation in Embodiment 1 of the present invention will be described with reference to FIG. In FIG. 5, the sub-reflector support part displacement sensor 12 attached to the main mirror part reference frame 11a has a three-dimensional position below the main reflector part reference frame 11a (on the main reflector side). P (px, py, pz) is measured. Note that this position P is considered to be a point representing the main reflecting mirror 1, and is installed as many as the number of sub-reflecting mirror support portions 4. Similarly, the sub-reflector displacement sensor 13 attached to the sub-mirror reference frame 11c is provided with a displacement Q (qx, qy, qz) of the sub-reflector 3 relative to the sub-mirror reference frame 11c such as the outer peripheral portion of the back surface of the sub-reflector 3. ). Thus, the coordinates of the reference point P and the point Q in the reference space before the deformation are measured by the sub-reflecting mirror support part displacement sensor 12 and the sub-reflecting mirror displacement sensor 13. From these measured values, the position R of the sub-reflecting mirror unit 3 with reference to the position P (main reflecting mirror) is
R = Q-P (1)
It is obtained.

When the sub-reflector position before the deformation of the sub-reflector support part 4 due to thermal deformation such as solar radiation, self-weight deformation, or wind pressure is R0, and the sub-reflector position after the deformation is R ', The sub-reflector position correction value ΔR of
ΔR = R′−R0 (2)
It is obtained. The sub-reflector position correction value ΔR is a displacement amount of the sub-reflector 3 to be corrected, and the calculation is performed by calculating the pointing error of the measurement calculator 14 shown in FIG. 4 from the displacement data 15a and 15b of the displacement sensors 12 and 13. It can be calculated by the unit 31, the first secondary mirror correction calculation unit (directivity error) 33, the second secondary mirror correction calculation unit (posture deformation) 35 and the secondary mirror drive calculation unit 37.

The basic concept in the case of measuring with a pair of sensors composed of one sub-reflecting mirror support portion displacement sensor 12 and one sub-reflecting mirror displacement sensor 13 has been described above. Several pairs of sensors 12 and sub-reflecting mirror displacement sensors 13 are provided for measurement. The operation in this case will be described.
For example, when the number of sub-reflecting mirror support parts 4 is 3, there are three pairs of sensors. When there are three pairs of sensors, the position P of the lower part of the secondary reflector support part 4 (on the primary reflector side) with respect to the primary mirror part reference frame 11a is P1, P2, P3 for each secondary reflector support part sensor 12. To do. The displacement Q of the sub-reflecting mirror 3 with respect to the sub-mirror reference frame 11c is Q1, Q2, and Q3 for each sub-reflecting mirror displacement sensor 13. The displacement R of the sub-reflector vertex position is
R (x, y, z) = (Σ (qxi-pxi) / 3, Σ (qyi-pyi) / 3, Σ (qzi-pzi) / 3) (3)
However (i = 1, 2, 3)
It is obtained.
Where Q = (qx, qy, qz)
P = (px, py, pz).
ΔR is ΔR (Δx, Δy, Δz) = (Σ (r'xi-r0xi) / 3, Σ (r'yi-r0yi) / 3, Σ (r'zi-r0zi) / 3) (4)
It is obtained.
Where R ′ = (r′x, r′y, r′z)
R0 = (r0x, r0y, r0z).
The sub-reflector position correction value ΔR calculated in this way is input to the sub-reflector drive mechanism 5, the position of the sub-reflector 3 is corrected, and the pointing error and the focus position error are corrected in real time.

As described above, according to the present invention, the reference frame 11 is provided in the internal space of the main reflector support portion and the sub reflector support portion and the periphery of the sub reflector, and the main reflector side base of the sub reflector support portion is provided in the reference frame. Since the sub-reflector support part displacement sensor 12 for measuring the displacement of the sub-reflector and the sub-reflector displacement sensor 13 for measuring the sub-reflector side of the sub-reflector support part or the sub-reflector displacement sensor 13 are installed. It is only necessary to install the sensor at several places, and the sensor can be arranged in a place that can be easily accessed even after laying, so that maintainability is greatly improved. Furthermore, depending on the sensor to be installed, three-dimensional information can be accurately measured with one sensor, and an antenna device with high directivity can be obtained.
Although the case where the number of sub-reflecting mirror support parts 4 is three has been described above, the same applies to the case where there are four or more.

Embodiment 2. FIG.
Next, an antenna device according to Embodiment 2 of the present invention will be described with reference to the drawings. The drawings of the antenna device according to the second embodiment are the same as those of FIGS. 1 to 4 of the antenna device according to the first embodiment, and will be described with reference to these drawings.
In Embodiment 2 of the present invention, instead of correcting the directing error generated by the sub-reflector position correction value ΔR obtained by Equation 2 by the sub-reflector driving mechanism 5, the position / orientation of the main reflector 1 of the antenna is changed. Correction is performed by the AZ drive mechanism 10 or the EL drive mechanism 8 to be changed. The operation in this case will be described below.

The directivity error Δθ of the antenna due to the displacement ΔR of the sub-reflecting mirror 3 is
Δθ (ΔAZ, ΔEL) = f (ΔR, Fm, M) (5)
As described above, it is expressed by a function of a combined focal length Fm of the antenna and a magnification factor (Magnification Factor) M.
Here, ΔAZ and ΔEL are drive correction values for AZ and EL. The calculation from the displacement ΔR of the sub-reflecting mirror 3 to the AZ and EL drive correction values ΔAZ and ΔEL is calculated by the primary mirror correction calculation unit 38 and the primary mirror drive calculation unit 40 of the measurement calculation unit 4 shown in FIG. The
That is, the AZ correction calculation unit 38a and the EL correction calculation unit 38b in the primary mirror correction calculation unit 38 calculate the primary mirror position correction value 39, and the primary mirror position correction value 39 and the primary mirror drive command value 18 are converted into the primary mirror drive calculation. The AZ / EL drive correction value 17 is input to the unit 40 and calculated.

  Of the AZ / EL drive correction values 17 calculated in this way, the EL drive correction value 17a is input to the EL axis drive mechanism 8 of the antenna, and the AZ drive correction value 17b is input to the AZ axis drive mechanism 10 of the antenna. The position / orientation of the main reflecting mirror 1 is corrected, and the pointing error due to the position of the sub-reflecting mirror 3 is corrected in real time. Thus, the antenna is driven in a desired direction in which the pointing error is corrected.

Embodiment 3 FIG.
In the antenna device according to the third embodiment of the present invention, the difference between the displacement data 15a of the sub-reflecting mirror support part displacement sensor 12 and the displacement data 15b of the sub-reflecting mirror displacement sensor 13 is used in order to correct the pointing error with higher accuracy. The position of the sub-reflecting mirror 3 is calculated from the position of the sub-reflecting mirror 3 before (reference value) and after (displacement value) the position of the sub-reflecting mirror 3 is deformed by its own weight, deformation by wind pressure, temperature change such as solar radiation, and deformation by temperature distribution. The parallel displacement and the rotational displacement of the sub-reflecting mirror 3 are calculated from the difference between the reference value and the displacement value, and the sub-reflecting mirror position correction value and the directivity correction value are calculated from the calculated values. Is.

また回転変位△Ｒθは、各軸周りの回転θｘ、θｙ、θｚとすると、式７のようになる。

For example, as shown in FIG. 6, the parallel displacement and the rotational displacement of the sub-reflecting mirror 3 define Q as the position of the sub-reflecting mirror 3 and provide coordinates with the center of the main mirror reference frame 11 a as the center. In this case, when the parallel displacement ΔR is the displacements Δx, Δy, Δz in the X, Y, and Z directions, Equation 6 is obtained.

Further, the rotational displacement ΔRθ is expressed by Equation 7 when the rotations around the respective axes are θx, θy, and θz.

  As described above, the parallel displacement ΔR and the rotational displacement ΔRθ are calculated, and the correction value and the directivity correction value of the sub-reflecting mirror position are calculated from these values, and similarly to the first and second embodiments. Correcting the pointing error by correcting the position of the sub-reflecting mirror 3 by the sub-reflecting mirror driving mechanism 5 or correcting the position / orientation of the main reflecting mirror 1 of the antenna by the AZ driving mechanism 10 or EL driving mechanism 8. It is what you do.

1 is a system configuration diagram of an antenna device according to Embodiment 1 of the present invention. It is detail drawing of the reference frame provided in the internal space of the main reflector support part in Embodiment 1 of this invention and a subreflector support part. It is detail drawing of the reference frame provided in the internal space of a subreflector support part in Embodiment 1 of this invention, and a subreflector periphery. It is a specific block diagram of the measurement calculating part used in Embodiment 1 and Embodiment 2 of this invention. It is a conceptual diagram for demonstrating the operation | movement in Embodiment 1 of this invention. It is a figure explaining the parallel displacement and rotational displacement in Embodiment 3 of this invention.

Explanation of symbols

1 main reflector, 2 main reflector support,
3 sub reflector, 4 sub reflector support,
5 Sub-reflection mirror drive mechanism, 6 Center support part (antenna mount part),
7 EL rotating structure (antenna mounting part), 8 EL axis driving mechanism 9 AZ rotating structure (antenna mounting part), 10 AZ axis driving mechanism,
11a primary mirror reference frame, 11b secondary mirror stay reference frame,
11c Sub mirror part reference frame, 12 Sub reflector support part displacement sensor,
13 sub-reflector displacement sensor, 14 measurement calculation unit,
15 Displacement data 16 Sub-reflector position correction value,
17 AZ / EL drive correction value, 18 Primary mirror drive command value, 31 Direction error calculation unit, 32 Direction error,
33 first secondary mirror correction calculation unit (directing error), 34 secondary mirror position correction value (directing error),
35 second secondary mirror correction calculation unit (posture deformation), 36 secondary mirror position correction value (posture deformation),
37 secondary mirror drive calculation unit, 38 primary mirror correction calculation unit,
39 Primary mirror position correction value, 40 Primary mirror drive calculation unit,

Claims (5)

A main reflector, a main reflector support that supports the main reflector, a sub-reflector, a sub-reflector support that supports the sub-reflector and is attached to the main reflector or the main reflector support; and In the antenna device having the antenna mount portion that supports the main reflector support portion,
A reference frame provided in an inner space of the main reflector support portion and the sub reflector support portion and around the sub reflector,
A sub-reflector support part displacement sensor that is installed in the reference frame and measures the displacement of the base part of the sub-reflector support part on the main reflector side;
A sub-reflector displacement sensor that is installed on the reference frame and measures the displacement of the sub-reflector side of the sub-reflector support or the sub-reflector;
The position of the sub-reflecting mirror is calculated from the output values of the sub-reflecting mirror support part displacement sensor and the sub-reflecting mirror displacement sensor, and the sub-reflecting mirror position correction value is calculated from the difference between the positions before and after the deformation of the sub-reflecting mirror. A measurement calculation unit;
An antenna device comprising: a sub-reflecting mirror driving unit that corrects the position of the sub-reflecting mirror based on the sub-reflecting mirror correction value calculated by the measurement calculation unit. A main reflector, a main reflector support that supports the main reflector, a sub-reflector, a sub-reflector support that supports the sub-reflector and is attached to the main reflector or the main reflector support; and In the antenna device having the antenna mount portion that supports the main reflector support portion,
A reference frame provided in an inner space of the main reflector support portion and the sub reflector support portion and around the sub reflector,
A sub-reflector support part displacement sensor that is installed in the reference frame and measures the displacement of the base part of the sub-reflector support part on the main reflector side;
A sub-reflector displacement sensor that is installed on the reference frame and measures the displacement of the sub-reflector side of the sub-reflector support or the sub-reflector;
A measurement calculation unit that calculates the position of the sub-reflecting mirror from the output values of the sub-reflecting mirror support part displacement sensor and the sub-reflecting mirror displacement sensor, and calculates the directional correction value from the difference between the positions before and after the deformation of the sub-reflecting mirror When,
An AZ axis drive mechanism that corrects the orientation of the AZ axis based on the orientation correction value calculated by the measurement calculation unit;
An antenna apparatus comprising: an EL axis drive mechanism that corrects the directivity of the EL axis based on the directivity correction value calculated by the measurement calculation unit.   The antenna device according to claim 1, wherein the sub-reflecting mirror support part displacement sensor and the sub-reflecting mirror displacement sensor have at least three pairs, and the measurement calculation unit calculates the sub-reflecting mirror position correction value from the displacement of each sensor. .   The antenna apparatus according to claim 2, wherein at least three pairs of sub-reflecting mirror support unit displacement sensors and sub-reflecting mirror displacement sensors are provided, and the measurement calculation unit calculates a directivity correction value from the displacement of each sensor.   Calculate the position of the sub-reflecting mirror from the difference between the output value of the sub-reflecting mirror support part displacement sensor and the output value of the sub-reflecting mirror displacement sensor. Calculated in two cases before (reference value) and after (displacement value) the deformation due to the temperature distribution, and calculated the parallel displacement and rotational displacement of the subreflector from the difference between the reference value and the displacement position. The antenna device according to claim 1 or 2, wherein a correction value and a directivity correction value of the sub reflector position are calculated from the values.

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