Antenna degradation detection device and antenna degradation detection program

Abstract

To provide an antenna degradation determination device for a rolling mechanism of an antenna device capable of discriminating degradation generation from time change of a random vibration environment on the basis of objective determination reference without performing subjective threshold setting so as not to delay determination of degradation generation of the rolling mechanism.SOLUTION: In an antenna direction control system S, an antenna degradation determination device comprises: a measurement vibration information acquisition unit 1 that acquires information on vibration characteristics of an antenna device A from a measurement vibration sensor M rotated with the drive of a rolling mechanism of the antenna device A; a reference point vibration information acquisition unit 4 for acquiring information on vibration characteristics of the antenna device A from a reference point vibration sensor R fixed independently of the drive of the rolling mechanism of the antenna device A; and a rolling mechanism degradation determination unit 5 that determines a degradation situation of the rolling mechanism of the antenna device A on the basis of a ratio between the vibration characteristics of the antenna device A for which information was acquired by the measurement vibration information acquisition unit 1 and the vibration characteristics of the antenna device A for which information was acquired by the reference point vibration information acquisition unit 4.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a technique for determining the deterioration status of a rotation mechanism of an antenna device.

Background Art

[0002] A technique for controlling the antenna direction of a satellite communication device or the like mounted on a ship or the like under random vibrations such as those under the vibrations of a ship is disclosed in Patent Document 1 and the like.

[0003] The configuration of a conventional antenna device is shown in FIG. 1. The antenna device A is mounted on a ship V and includes an azimuth axis, an elevation axis, a cross-elevation axis, and a vibration sensor M for measurement. The vibration sensor M for measurement is an acceleration sensor or the like and is installed at the tip of the antenna device A in order to accurately measure the vibration characteristics (intensity or frequency, etc.) of the antenna device A.

[0004] The configuration of a conventional antenna direction control system is shown in FIG. 2. The antenna direction control system S includes an antenna device A and an antenna direction control device C. The antenna direction control device C includes a vibration information acquisition unit 1 for measurement, an antenna direction control unit 2, and a rotation mechanism deterioration prediction unit 3.

[0005] <00000(...)The vibration information acquisition unit 1 for measurement acquires information on the vibration characteristics (intensity or frequency, etc.) of the antenna device A from the vibration sensor M for measurement. The antenna direction control unit 2 controls the antenna direction of the antenna device A based on the vibration characteristics (intensity or frequency, etc.) of the antenna device A for which the vibration information acquisition unit 1 for measurement has acquired information, the position information of the ship V, and the position information of the communication satellite. [[ID=2(...)

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Incidentally, the azimuth axis, elevation axis, or cross-elevation axis of antenna device A may experience age-related deterioration such as bearing degradation or loosening of the drive belt. Therefore, although it is not the original purpose, it is conceivable to use the measuring vibration sensor M to predict the possible deterioration status of the azimuth axis, elevation axis, or cross-elevation axis of antenna device A.

[0008] Specific examples of conventional antenna degradation prediction processing are shown in Figures 3 and 4. The rotation mechanism degradation prediction unit 3 predicts the possible degradation status of the azimuthal axis, elevation axis, or cross-elevation axis of the antenna device A based on the vibration characteristics of the antenna device A for which the measurement vibration information acquisition unit 1 has acquired information.

[0009] In Figure 3, the rotation mechanism deterioration prediction unit 3 determines that deterioration has not occurred in the azimuth axis, elevation axis, and cross elevation axis of antenna device A when the cumulative time exceeding the intensity threshold for the vibration intensity of antenna device A, for which information has been acquired by the measurement vibration information acquisition unit 1, does not exceed the time threshold. On the other hand, the rotation mechanism deterioration prediction unit 3 predicts the possibility of deterioration occurring in the azimuth axis, elevation axis, or cross elevation axis of antenna device A when the cumulative time exceeding the intensity threshold for the vibration intensity of antenna device A, for which information has been acquired by the measurement vibration information acquisition unit 1, exceeds the time threshold.

[0010] However, if the rotation mechanism deterioration prediction unit 3 does not appropriately set the intensity threshold and time threshold for the vibration intensity of the antenna device A for which the measurement vibration information acquisition unit 1 has acquired information, it may delay predicting the possibility of deterioration occurring in the azimuth axis, elevation axis, or cross elevation axis of the antenna device A.

[0011] In Figure 4, the rotation mechanism deterioration prediction unit 3 predicts the possibility of deterioration occurring in the azimuth axis, elevation axis, or cross elevation axis of antenna device A when the vibration intensity of antenna device A, for which information has been acquired by the measurement vibration information acquisition unit 1, becomes smaller than the vibration intensity measured in advance before deterioration occurred in the azimuth axis, elevation axis, and cross elevation axis of antenna device A. Alternatively, the rotation mechanism deterioration prediction unit 3 predicts the possibility of deterioration occurring in the azimuth axis, elevation axis, or cross elevation axis of antenna device A when the vibration frequency of antenna device A, for which information has been acquired by the measurement vibration information acquisition unit 1, becomes lower than the vibration frequency measured in advance before deterioration occurred in the azimuth axis, elevation axis, and cross elevation axis of antenna device A.

[0012] In other words, when deterioration occurs in the azimuth axis, elevation axis, or cross-elevation axis of antenna device A, the vibration transmission path from the base of antenna device A to the measuring vibration sensor M is blocked at the location of deterioration, so it is thought that the vibration intensity of antenna device A from which the measuring vibration information acquisition unit 1 acquires information will become smaller. Furthermore, when deterioration occurs in the azimuth axis, elevation axis, or cross-elevation axis of antenna device A, the vibration transmission path from the base of antenna device A to the measuring vibration sensor M effectively becomes less rigid, so it is thought that the vibration frequency of antenna device A from which the measuring vibration information acquisition unit 1 acquires information will become even lower.

[0013] However, the rotation mechanism deterioration prediction unit 3 cannot distinguish between the possibility of deterioration occurring in the azimuth axis, elevation axis, or cross elevation axis of the antenna device A and the time change in the vibration environment of the ship V (such as a decrease in intensity or a decrease in frequency), and therefore may delay the prediction of the possibility of deterioration occurring in the azimuth axis, elevation axis, or cross elevation axis of the antenna device A.

[0014] Therefore, in order to solve the aforementioned problems, this disclosure aims to distinguish between the occurrence of deterioration in the rotation mechanism of an antenna device and the time-dependent changes in a random vibration environment, based on objective judgment criteria without setting subjective thresholds, in order to avoid delaying the determination of the occurrence of deterioration in the rotation mechanism of an antenna device. [Means for solving the problem]

[0015] To solve the aforementioned problem, in addition to a measuring vibration sensor that rotates in conjunction with the rotation mechanism of the antenna device, a reference point vibration sensor that is fixed independently of the rotation mechanism of the antenna device is installed. Here, even when deterioration occurs in the rotation mechanism of the antenna device, the vibration transmission path from the base of the antenna device to the reference point vibration sensor does not include the deterioration location and effectively does not change the rigidity, so it is considered that the vibration characteristics of the antenna device from which information is obtained from the reference point vibration sensor remain unchanged (the vibration environment is the same). Therefore, the deterioration status of the rotation mechanism of the antenna device is determined based on the ratio between the vibration characteristics of the antenna device from which information is obtained from the measuring vibration sensor and the vibration characteristics of the antenna device from which information is obtained from the reference point vibration sensor.

[0016] Specifically, the present disclosure is an antenna deterioration determination device characterized by comprising: a measuring vibration information acquisition unit that acquires information on the vibration characteristics of an antenna device from a measuring vibration sensor that is rotated in conjunction with the driving of the rotation mechanism of the antenna device; a reference point vibration information acquisition unit that acquires information on the vibration characteristics of an antenna device from a reference point vibration sensor that is fixed independently of the driving of the rotation mechanism of the antenna device; and a rotation mechanism deterioration determination unit that determines the deterioration status of the rotation mechanism of the antenna device based on the ratio between the vibration characteristics of the antenna device acquired by the measuring vibration information acquisition unit and the vibration characteristics of the antenna device acquired by the reference point vibration information acquisition unit.

[0017] With this configuration, in order to avoid delaying the determination of deterioration in the rotation mechanism of the antenna device, the vibration characteristics of the antenna device obtained from a reference point vibration sensor are used as an objective standard, and based on the vibration characteristics of the antenna device obtained from a measurement point vibration sensor, it is possible to distinguish between deterioration in the rotation mechanism of the antenna device and the time-dependent changes in the random vibration environment.

[0018] Furthermore, this disclosure provides an antenna deterioration determination device characterized in that the rotation mechanism deterioration determination unit determines the occurrence of deterioration of the rotation mechanism of the antenna device when the ratio between the vibration characteristics of the antenna device for which the measurement vibration information acquisition unit has acquired information and the vibration characteristics of the antenna device for which the reference point vibration information acquisition unit has acquired information differs from the ratio measured in advance before deterioration of the rotation mechanism of the antenna device occurred.

[0019] With this configuration, the ratio between the vibration characteristics of the antenna device obtained from the measurement point vibration sensor and the vibration characteristics of the antenna device obtained from the reference point vibration sensor can be used to distinguish between (1) when the ratio differs from the ratio previously measured before the deterioration of the antenna device's rotation mechanism occurs, it is possible to determine that deterioration of the antenna device's rotation mechanism has occurred, and (2) when the ratio remains equal to the ratio previously measured before the deterioration of the antenna device's rotation mechanism occurs, it is possible to determine that random vibration environments are changing over time.

[0020] Furthermore, this disclosure relates to an antenna deterioration determination device characterized in that the measurement vibration information acquisition unit and the reference point vibration information acquisition unit acquire information on the vibration intensity of the antenna device from the measurement vibration sensor and the reference point vibration sensor, and the rotation mechanism deterioration determination unit determines the occurrence of deterioration of the rotation mechanism of the antenna device when the ratio of the vibration intensity of the antenna device acquired by the measurement vibration information acquisition unit to the vibration intensity of the antenna device acquired by the reference point vibration information acquisition unit becomes smaller than a ratio measured in advance before deterioration of the rotation mechanism of the antenna device occurs.

[0021] With this configuration, in order to avoid delaying the determination of deterioration in the rotation mechanism of the antenna device, the vibration intensity of the antenna device obtained from a reference point vibration sensor is used as an objective standard, and based on the vibration intensity of the antenna device obtained from a measurement point vibration sensor, it is possible to distinguish between deterioration in the rotation mechanism of the antenna device and the time-dependent changes in the random vibration environment.

[0022] Further, in the present disclosure, the vibration information acquisition unit for measurement and the reference point vibration information acquisition unit acquire information on the vibration frequency of the antenna device from the vibration sensor for measurement and the reference point vibration sensor, and the rotation mechanism deterioration determination unit determines the ratio of the vibration frequency of the antenna device acquired by the measurement vibration information acquisition unit to the vibration frequency of the antenna device acquired by the reference point vibration information acquisition unit. When the ratio is smaller than the ratio measured in advance before the deterioration of the rotation mechanism of the antenna device occurs, it is determined that the rotation mechanism of the antenna device has deteriorated. The antenna deterioration determination device is characterized in that.

[0023] According to this configuration, in order not to delay the determination of the occurrence of deterioration of the rotation mechanism of the antenna device, the vibration frequency of the antenna device acquired from the reference point vibration sensor is used as an objective reference, and the vibration frequency of the antenna device acquired from the measurement point vibration sensor is used. Based on this, it is possible to distinguish between the occurrence of deterioration of the rotation mechanism of the antenna device and the time change of the random vibration environment.

[0024] Further, the present disclosure is an antenna deterioration determination program for causing a computer to execute each processing step performed by each processing unit included in the antenna deterioration determination device described above.

[0025] According to this configuration, it is possible to provide a program having the effects described above.

[0026] Further, the present disclosure is an antenna deterioration determination system characterized by including the antenna deterioration determination device described above, the antenna device, the vibration sensor for measurement, and the reference point vibration sensor.

[0027] According to this configuration, it is possible to provide a system having the effects described above.

[0028] Note that the inventions of the above disclosures can be combined as much as possible.

Effect of the Invention

[0029] Thus, in order to avoid delaying the determination of deterioration in the rotation mechanism of the antenna device, this disclosure makes it possible to distinguish between deterioration in the rotation mechanism of the antenna device and the time-dependent changes in the random vibration environment based on objective judgment criteria without setting subjective thresholds. [Brief explanation of the drawing]

[0030] [Figure 1] This diagram shows the configuration of a conventional antenna device. [Figure 2] This diagram shows the configuration of a conventional antenna direction control system. [Figure 3] This figure shows a specific example of conventional antenna degradation prediction processing. [Figure 4] This figure shows a specific example of conventional antenna degradation prediction processing. [Figure 5] This figure shows the configuration of the antenna device disclosed herein. [Figure 6] This diagram shows the configuration of the antenna direction control system disclosed herein. [Figure 7] This diagram shows the procedure for determining antenna degradation as described in this disclosure. [Figure 8] This figure shows a specific example of the antenna degradation determination process in this disclosure. [Figure 9] This figure shows a specific example of the antenna degradation determination process in this disclosure. [Modes for carrying out the invention]

[0031] Embodiments of the present disclosure will be described with reference to the attached drawings. The embodiments described below are examples of the implementation of the present disclosure, and the present disclosure is not limited to these embodiments.

[0032] (Procedure for determining antenna degradation as disclosed herein) Figure 5 shows the configuration of the antenna device of this disclosure. Antenna device A is mounted on a ship V and includes an azimuth axis, an elevation axis, a cross elevation axis, a measuring vibration sensor M, and a reference point vibration sensor R. The measuring vibration sensor M is an acceleration sensor or the like and is installed at the tip of antenna device A in order to measure the vibration characteristics (intensity or frequency, etc.) of antenna device A with high precision. The reference point vibration sensor R is an acceleration sensor or the like and is installed near the base of antenna device A so as to be fixed independently of the drive of the azimuth axis, elevation axis, and cross elevation axis of antenna device A. It is desirable that the reference point vibration sensor R be installed below the drive mechanism of the azimuth axis of antenna device A, but if it is installed near the base of antenna device A, it may also be installed above the drive mechanism of the azimuth axis of antenna device A.

[0033] Figure 6 shows the configuration of the antenna direction control system of this disclosure. The antenna direction control system S comprises an antenna device A and an antenna direction control device C. The antenna direction control device C comprises a measurement vibration information acquisition unit 1, a reference point vibration information acquisition unit 4, an antenna direction control unit 2, and a rotation mechanism deterioration determination unit 5. The antenna direction control device C can be realized by installing the antenna deterioration determination program shown in Figure 7 onto a computer.

[0034] The procedure for determining antenna degradation according to this disclosure is shown in Figure 7. The measurement vibration information acquisition unit 1 acquires information on the vibration characteristics (intensity or frequency, etc.) of the antenna device A from the measurement vibration sensor M (step S1). The reference point vibration information acquisition unit 4 acquires information on the vibration characteristics (intensity or frequency, etc.) of the antenna device A from the reference point vibration sensor R (step S2).

[0035] The antenna direction control unit 2 controls the antenna direction of antenna device A based on the vibration characteristics (intensity or frequency, etc.) of antenna device A acquired by the measurement vibration information acquisition unit 1, the position information of the ship V, and the position information of the communication satellite (similar to the conventional technology). However, deterioration over time, such as bearing deterioration or loosening of the drive belt, may occur in the azimuth axis, elevation axis, or cross elevation axis of antenna device A.

[0036] The rotation mechanism deterioration determination unit 5 determines the deterioration status of the azimuth axis, elevation axis, or cross elevation axis of the antenna device A based on the ratio between the vibration characteristics (intensity or frequency, etc.) of the antenna device A acquired by the measurement vibration information acquisition unit 1 and the vibration characteristics (intensity or frequency, etc.) of the antenna device A acquired by the reference point vibration information acquisition unit 4 (step S3~).

[0037] First, the rotation mechanism deterioration determination unit 5 calculates the ratio between the vibration characteristics (intensity or frequency, etc.) of antenna device A acquired by the measurement vibration information acquisition unit 1 and the vibration characteristics (intensity or frequency, etc.) of antenna device A acquired by the reference point vibration information acquisition unit 4 (step S3).

[0038] Then, the rotation mechanism deterioration determination unit 5 determines that deterioration has occurred in the azimuth axis, elevation axis, or cross elevation axis of the antenna device A when the ratio calculated in step S3 differs from the ratio measured in advance before deterioration occurred in the azimuth axis, elevation axis, and cross elevation axis of the antenna device A (step S4, NO).

[0039] On the other hand, the rotation mechanism deterioration determination unit 5 determines that deterioration has not occurred in the azimuth axis, elevation axis, and cross elevation axis of the antenna device A if the ratio calculated in step S3 remains equal to the ratio measured in advance before deterioration occurred in the azimuth axis, elevation axis, and cross elevation axis of the antenna device A (step S4, YES).

[0040] In other words, when deterioration occurs in the azimuth axis, elevation axis, or cross-elevation axis of antenna device A, the vibration transmission path from the base of antenna device A to the measuring vibration sensor M is blocked at the location of deterioration, so the vibration intensity of antenna device A from which the measuring vibration information acquisition unit 1 acquires information becomes smaller (under the same vibration environment conditions). Furthermore, when deterioration occurs in the azimuth axis, elevation axis, or cross-elevation axis of antenna device A, the vibration transmission path from the base of antenna device A to the measuring vibration sensor M effectively reduces rigidity, so the vibration frequency of antenna device A from which the measuring vibration information acquisition unit 1 acquires information becomes smaller (under the same vibration environment conditions).

[0041] On the other hand, even when deterioration occurs in the azimuth axis, elevation axis, or cross-elevation axis of antenna device A, the vibration transmission path from the base of antenna device A to the reference point vibration sensor R does not include the deterioration location, so the vibration intensity of antenna device A from which the reference point vibration information acquisition unit 4 acquires information remains unchanged (the vibration environment is the same). Furthermore, even when deterioration occurs in the azimuth axis, elevation axis, or cross-elevation axis of antenna device A, the vibration transmission path from the base of antenna device A to the reference point vibration sensor R does not effectively change its rigidity, so the vibration frequency of antenna device A from which the reference point vibration information acquisition unit 4 acquires information remains unchanged (the vibration environment is the same).

[0042] Thus, in order to avoid delaying the determination of deterioration in the rotation mechanism of antenna device A, the vibration characteristics of antenna device A obtained from the reference point vibration sensor R are used as an objective standard, and based on the vibration characteristics of antenna device A obtained from the measurement point vibration sensor M, it is possible to distinguish between the deterioration of the rotation mechanism of antenna device A and the time change in the vibration environment of the ship V.

[0043] Furthermore, regarding the ratio between the vibration characteristics of antenna device A obtained from the measurement point vibration sensor M and the vibration characteristics of antenna device A obtained from the reference point vibration sensor R, (1) when the ratio differs from the ratio measured in advance before the deterioration of the rotation mechanism of antenna device A occurs, it is possible to determine that deterioration of the rotation mechanism of antenna device A has occurred, and (2) when the ratio remains equal to the ratio measured in advance before the deterioration of the rotation mechanism of antenna device A occurs, it is possible to determine the change in the vibration environment of the ship V over time, and (1) and (2) can be distinguished.

[0044] (Specific example of the antenna degradation determination process described in this disclosure) Specific examples of the antenna degradation determination process described in this disclosure are shown in Figures 8 and 9. In Figure 8, the occurrence of degradation in the azimuth axis, elevation axis, or cross-elevation axis of antenna device A is determined. In Figure 9, the time change of the vibration environment of ship V is determined. In other words, the two cases are distinguished.

[0045] In the upper left and upper right sections of Figures 8 and 9, the measurement vibration information acquisition unit 1 acquires vibration intensity and vibration frequency information of the antenna device A from the measurement vibration sensor M (step S1). In the lower left and lower right sections of Figures 8 and 9, the reference point vibration information acquisition unit 4 acquires vibration intensity and vibration frequency information of the antenna device A from the reference point vibration sensor R (step S2).

[0046] In Figures 8 and 9, the rotation mechanism deterioration judgment unit 5 calculates the ratio of the vibration intensity and vibration frequency of antenna device A, for which information was acquired by the measurement vibration information acquisition unit 1, to the vibration intensity and vibration frequency of antenna device A, for which information was acquired by the reference point vibration information acquisition unit 4 (step S3).

[0047] In the upper left and lower left columns of Figures 8 and 9, the ratio of vibration intensity calculated in step S3 was 3 times, and the ratio of vibration frequency calculated in step S3 was 1 time, before deterioration occurred in the azimuthal axis, elevation axis, and cross elevation axis of antenna device A.

[0048] In the upper right and lower right columns of Figure 8, the ratio of vibration intensity calculated in step S3 is currently 2 times, and the ratio of vibration frequency calculated in step S3 is 0.5 times. In other words, at this point, the ratio of vibration intensity calculated in step S3 is smaller than before the deterioration of the azimuthal axis, elevation axis, and cross elevation axis of antenna device A occurred, and the ratio of vibration frequency calculated in step S3 is smaller (step S4, NO). Therefore, the rotation mechanism deterioration determination unit 5 determines that deterioration has occurred in the azimuthal axis, elevation axis, or cross elevation axis of antenna device A (step S5).

[0049] In the upper right and lower right columns of Figure 9, at this point in time, the ratio of vibration intensity calculated in step S3 is 3 times, and the ratio of vibration frequency calculated in step S3 is 1 time. In other words, at this point in time, the ratio of vibration intensity calculated in step S3 is equal to that before deterioration occurred in the azimuthal axis, elevation axis, and cross elevation axis of antenna device A, and the ratio of vibration frequency calculated in step S3 is equal (step S4, YES). However, at this point in time, the vibration intensity measured in steps S1 and S2 is smaller and the vibration frequency measured in steps S1 and S2 is lower compared to before deterioration occurred in the azimuthal axis, elevation axis, and cross elevation axis of antenna device A. Therefore, the rotation mechanism deterioration judgment unit 5 determines the change in the vibration environment of the ship V over time (step S6).

[0050] Thus, in order to avoid delaying the determination of deterioration in the rotation mechanism of antenna device A, the vibration intensity of antenna device A obtained from the reference point vibration sensor R is used as an objective standard, and based on the vibration intensity of antenna device A obtained from the measurement point vibration sensor M, it is possible to distinguish between the deterioration of the rotation mechanism of antenna device A and the time change in the vibration environment of the ship V.

[0051] Furthermore, in order to avoid delaying the determination of deterioration in the rotation mechanism of antenna device A, the vibration frequency of antenna device A obtained from the reference point vibration sensor R is used as an objective standard, and based on the vibration frequency of antenna device A obtained from the measurement point vibration sensor M, it is possible to distinguish between the deterioration of the rotation mechanism of antenna device A and the time change in the vibration environment of the ship V.

[0052] (Specific example of antenna degradation detection processing in modified cases) In this embodiment, when deterioration occurs in the azimuth axis, elevation axis, or cross elevation axis of the antenna device A, the vibration transmission path from the base of the antenna device A to the measuring vibration sensor M is blocked at the location of deterioration. As a result, the vibration intensity of the antenna device A, for which the measuring vibration information acquisition unit 1 acquires information, becomes smaller (the vibration environment of the ship V is under the same conditions).

[0053] As a variation, when deterioration occurs in the azimuth axis, elevation axis, or cross-elevation axis of antenna device A, the vibration transmission path from the base of antenna device A to the measuring vibration sensor M may have a natural vibration frequency equal to the applied vibration frequency, and the vibration intensity of antenna device A from which the measuring vibration information acquisition unit 1 acquires information may become greater (the vibration environment of the ship V is under the same conditions).

[0054] In this embodiment, the deterioration status of the rotation mechanism of an antenna device A mounted on a ship V was determined under random vibrations, such as those of a ship V. As a variation, the deterioration status of the rotation mechanism of an excavator having an arm structure may be determined under random vibrations, such as those of a construction site. Alternatively, the deterioration status of the rotation mechanism of an antenna device mounted on a high-rise building may be determined under random vibrations, such as those of a high-rise building. [Industrial applicability]

[0055] The antenna degradation detection device and antenna degradation detection program of this disclosure can distinguish between the occurrence of degradation of an antenna device or a rotating mechanism such as an excavator and the time-dependent changes in a random vibration environment, based on objective judgment criteria without setting subjective thresholds, in order to avoid delaying the determination of the occurrence of degradation of an antenna device or a rotating mechanism such as an excavator. [Explanation of Symbols]

[0056] V: Ship A: Antenna device M: Vibration sensor for measurement R: Reference point vibration sensor S: Antenna Direction Control System C: Antenna Direction Control Device 1: Vibration information acquisition section for measurement 2: Antenna Direction Control Unit 3: Predicted deterioration of the rotating mechanism 4: Reference point vibration information acquisition section 5: Rotation mechanism deterioration judgment unit

Claims

1. A vibration information acquisition unit acquires information on the vibration characteristics of the antenna device from a vibration sensor that rotates in conjunction with the driving of the rotation mechanism of the antenna device, A reference point vibration information acquisition unit acquires information on the vibration characteristics of the antenna device from a reference point vibration sensor that is fixed independently of the rotation mechanism of the antenna device, A rotation mechanism deterioration determination unit determines the deterioration status of the rotation mechanism of the antenna device based on the ratio between the vibration characteristics of the antenna device acquired by the measurement vibration information acquisition unit and the vibration characteristics of the antenna device acquired by the reference point vibration information acquisition unit. An antenna degradation detection device characterized by comprising the following features.

2. The rotation mechanism deterioration determination unit determines that deterioration has occurred in the rotation mechanism of the antenna device when the ratio between the vibration characteristics of the antenna device, for which the measurement vibration information acquisition unit has acquired information, and the vibration characteristics of the antenna device, for which the reference point vibration information acquisition unit has acquired information, differs from the ratio previously measured before deterioration of the rotation mechanism of the antenna device occurred. The antenna degradation determination device according to claim 1, characterized in that

3. The measurement vibration information acquisition unit and the reference point vibration information acquisition unit acquire vibration intensity information of the antenna device from the measurement vibration sensor and the reference point vibration sensor. The rotation mechanism deterioration determination unit determines that deterioration has occurred in the rotation mechanism of the antenna device when the ratio of the vibration intensity of the antenna device, for which information has been obtained by the measurement vibration information acquisition unit, to the vibration intensity of the antenna device, for which information has been obtained by the reference point vibration information acquisition unit, becomes smaller than the ratio previously measured before deterioration of the rotation mechanism of the antenna device occurred. The antenna degradation determination device according to claim 2, characterized in that

4. The measurement vibration information acquisition unit and the reference point vibration information acquisition unit acquire information on the vibration frequency of the antenna device from the measurement vibration sensor and the reference point vibration sensor. The rotation mechanism deterioration determination unit determines that deterioration has occurred in the rotation mechanism of the antenna device when the ratio of the vibration frequency of the antenna device, for which information has been obtained by the measurement vibration information acquisition unit, to the vibration frequency of the antenna device, for which information has been obtained by the reference point vibration information acquisition unit, becomes smaller than the ratio previously measured before deterioration of the rotation mechanism of the antenna device occurred. An antenna degradation determination device according to claim 2 or 3, characterized in that

5. A step of acquiring measurement vibration information, which involves acquiring information on the vibration characteristics of an antenna device from a measurement vibration sensor that is rotated in conjunction with the driving of the rotation mechanism of the antenna device, A reference point vibration information acquisition step, which acquires information on the vibration characteristics of the antenna device from a reference point vibration sensor that is fixed independently of the rotation mechanism of the antenna device, A rotation mechanism deterioration determination step determines the deterioration status of the rotation mechanism of the antenna device based on the ratio between the vibration characteristics of the antenna device for which the measurement vibration information acquisition step obtained information and the vibration characteristics of the antenna device for which the reference point vibration information acquisition step obtained information. An antenna degradation detection program to be executed by a computer.

6. An antenna degradation determination system comprising the antenna degradation determination device described in claim 1, the antenna device, the measuring vibration sensor, and the reference point vibration sensor.

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