JP6937178B2 - Satellite acquisition device and satellite acquisition method - Google Patents

Description

Embodiments of the present invention relate to, for example, satellite acquisition devices and satellite acquisition methods applicable to satellite communication devices.

VSAT (Very Small Aperture Terminal) is a communication device for communicating with a geostationary satellite, which has a relatively small antenna opening. In recent years, further miniaturization has progressed, and for example, some devices have been miniaturized to the extent that they can be mounted on a car or carried by one person, and their mobility has begun to be utilized at disaster sites. In addition, it is often used in cooperation with mobile communication infrastructure.

By the way, in order to communicate with the satellite, the satellite must be accurately captured and the antenna surface must be correctly oriented in the direction of the satellite. Conventionally, the adjustment of the antenna angle relies on the skill of a skilled person, but in recent years, a method of automatically capturing a satellite by a tracking mechanism has been proposed. For example, there is known a technique of measuring received power (received radio wave intensity) while rotating an antenna with a driving device, and capturing a satellite by pointing the antenna in the direction in which the level is maximum. Specifically, by adjusting the three axes of the azimuth angle (AZ (Azimuth) angle), elevation angle (EL (Elevation) angle), and polarization angle (POL (Polarization) angle) of the antenna, it is near the satellite direction. Detects radio field strength.

Japanese Unexamined Patent Publication No. 2008-294540 Japanese Unexamined Patent Publication No. 2-148902

After the antenna angle adjustment is completed and the operation is started, the antenna directivity may shift for some reason. In such a case, not only will the radio waves from the satellite become unreceivable, but other satellite communication systems will also be adversely affected by interference, so the transmitted radio waves will be immediately stopped and the automatic adjustment procedure for the antenna direction will be performed again. There is a need to.

However, with existing technology, the automatic adjustment procedure may be activated even in cases where it is not originally necessary, such as when a car or a person crosses the front of the antenna or when a cloud is just over the sky. If the automatic adjustment procedure is inadvertently started, satellite communication will not be possible during that time, and the user will have to wait until it resumes. Since the quality of service will deteriorate, countermeasures are desired.

Therefore, an object of the present invention is to provide a satellite acquisition device and a satellite acquisition method that prevent the readjustment procedure of the antenna directivity from being inadvertently activated.

According to the embodiment, the satellite acquisition device includes an antenna for receiving radio waves from an artificial satellite, a received radio wave intensity calculation unit, a position sensor, an inclination sensor, a satellite search unit, and a re-execution control unit. do. The received radio wave strength calculation unit calculates the reception strength of the radio wave. The position sensor acquires position information at the installation location. The tilt sensor acquires the amount of tilt at the installation location. The satellite search unit determines the search range of the artificial satellite from the installation location based on the acquired position information, and within this search range, the direction of the antenna is based on the reception intensity calculated by the received radio wave strength calculation unit. Perform an automatic adjustment procedure to adjust the direction. Re-execution control unit, after the automatic adjustment procedure is completed, the reception strength is below the specified value, and when the amount of inclination is equal to or greater than the threshold value, performs automatic adjustment procedure again.

The figure which shows an example of the satellite communication system using VSAT. The external view which shows an example of the satellite communication apparatus which concerns on embodiment. The functional block diagram which shows an example of the satellite communication apparatus 1 shown in FIG. The figure which shows an example of the direction information 44a. The figure which shows an example of the satellite target angle table 44b. The flowchart which shows an example of the processing procedure of the satellite communication apparatus 1 in 1st Embodiment. The flowchart which shows an example of the processing procedure in the operation mode after the automatic adjustment procedure is completed in 1st Embodiment. The figure which shows an example of the time variation of the received power of the radio wave from a satellite in the 2nd Embodiment. The flowchart which shows the other example of the processing procedure in operation mode in 3rd Embodiment. The flowchart which shows the other example of the processing procedure in operation mode in 4th Embodiment.

FIG. 1 is a diagram showing an example of a satellite communication system using VSAT. This system is formed around the communication satellite SAT in geosynchronous orbit. On the ground side, fixed stations 111, 114 to 11n are installed, for example, at the prefectural capital. It is also possible to install the in-vehicle station 112 or the portable station 113 at a disaster site or the like. The fixed stations 111, 114 to 11n, the in-vehicle station 112, and the portable station 113 are each provided with a VSAT device, and can communicate with each other via the communication satellite SAT.

For example, the image of the disaster site can be transmitted to the main bases (fixed stations 111) and each base (fixed stations 114 to 11n) by satellite line to help grasp the disaster situation. It can also be used for information sharing and disaster response discussions between related departments through VoIP (Voice over IP) calls and video conferences via satellite lines.

This type of system is often constructed as one of the disaster prevention systems of local governments. The line allocation method for the VSAT device is called DAMA (Demand Assignment Multiple Access). Control stations located at several points on the ground are responsible for controlling DAMA.

FIG. 2 is an external view showing an example of the satellite communication device according to the embodiment. The satellite communication device 1 shown in FIG. 2 is a so-called VSAT device, and has a function as a satellite acquisition device. The size of the satellite communication device 1 is compact enough to be carried by the user, and the weight is also suppressed. This satellite communication device 1 can be carried to a disaster site, for example, and used as an emergency communication station.

The satellite communication device 1 shown in FIG. 2 includes an antenna 10, a main body 11, a tripod 12 that supports the main body 11, columns 13b and 13c that physically connect the main body 11 and the antenna 10, and a transmission / reception unit 18. Be prepared. The main body 11 is a so-called computer including a processor (CPU (Central Processing Unit) or MPU (Micro Processing Unit) or the like) and a memory.

The antenna 10 receives radio waves from the artificial satellite and also transmits radio waves to the artificial satellite. The size of the antenna 10 is, for example, 50 cm × 50 cm. In addition to the planar antenna shown in the figure, a parabolic antenna can also be used as the antenna type. The directivity of the antenna 10 is sharply designed to minimize the energy loss of radio waves. Therefore, it is necessary to accurately match the azimuth angle (AZ angle), elevation angle (EL angle), and polarization angle (POL angle) with respect to the satellite, which are three different axes.

The transmission / reception unit 18 frequency-converts a signal in the radio frequency band transmitted / received via the antenna 10 into, for example, a signal in the baseband band. For example, by attaching the transmission / reception unit 18 to the back surface of the antenna 10 so as to be close to the antenna 10, the attenuation of the transmission signal and the reception signal can be suppressed.

Further, for example, a directional sensor 60 for acquiring directional information is attached to the back surface of the antenna 10. By installing the directional sensor 60 on the antenna 10, the directional sensor 60 can be rotated and moved horizontally along the directional axis. Further, the directional sensor 60 can be rotated by using both the antenna 10 and the motor 20, and the cost of the device can be reduced.

The support column 13b is provided, for example, perpendicularly to the upper surface (upper surface in FIG. 1) of the main body portion 11 and rotates in the rotation direction A which is an azimuth angle (AZ angle) with respect to the main body portion 11. The support column 13c is semi-fixed and rotatably attached to the support column 13b, and rotates in the rotation direction B which is an elevation angle (EL angle) with respect to the support column 13b. The columns 13b and 13c may have a folding mechanism. If the columns 13b and 13c are folded, the satellite communication device 1 can be further miniaturized, and the satellite communication device 1 can be easily handled.

The motors 20a and 20b are attached to the columns 13b. The motor 20c is attached to the column 13c. Each motor is controlled by a control signal from the motor control unit 202. The motor 20a rotates the antenna 10 around an axis (azimuth axis or AZ axis) in the rotation direction A. The motor 20b rotates the antenna 10 around an axis (elevation angle axis or EL axis) in the rotation direction B. The motor 20c rotates the antenna 10 around an axis (polarization axis or POL axis) in the rotation direction C.

The main body 11 includes a power button 14, a capture button 15, and a display device 90. The power button 14 is a button for switching between ON and OFF of the power of the satellite communication device 1. When the capture button 15 is operated after the device is turned on, the first satellite capture process is started, and the process for capturing the satellite using the antenna 10 is started.

The display device 90 is provided on the side surface of the main body 11, for example, and displays the result of satellite acquisition control processing and the like. The display device 90 does not have to be built in the satellite communication device 1, and may be a display device externally attached to the satellite communication device 1.

FIG. 3 is a functional block diagram showing an example of the satellite communication device 1 shown in FIG. The main body 11 includes a capture control unit 40, a motor control unit 30, a received radio wave intensity calculation unit 50 that calculates the reception sensitivity of the antenna, a position sensor 70, an inclination sensor 71, a user input device 80, and a display device as a notification unit. 90, a speaker 100 is provided.

The motor control unit 30 gives a control signal to each of the motors 20 (20a, 20b, 20c) in response to an instruction from the capture control unit 40 regarding the directivity direction of the antenna 10. As a result, the directivity directions of the antenna 10 and the directional sensor 60 attached to the antenna 10 can be changed.

The received radio wave intensity calculation unit 50 calculates the reception sensitivity of the received signal received by the antenna 10, and sends the obtained value to the capture control unit 40.

The directional sensor 60 acquires the directional information of the satellite communication device 1 by sensing the geomagnetism. The directivity direction of the directional sensor 60 changes in conjunction with the drive of the antenna 10 by the motor 20, and the acquired directional information also changes. The acquired directional information is passed to the capture control unit 40.

The position sensor 70 acquires position information (for example, latitude and longitude) of the installation location of the satellite communication device 1 by, for example, GPS (Global Positioning System). The acquired position information is passed to the capture control unit 40.

The tilt sensor 71 acquires the tilt amount of the satellite communication device 1 at the installation location. For example, the amount of inclination of the satellite communication device 1 can be acquired by detecting the gravitational acceleration of the earth at the installation location using an acceleration sensor. The acquired amount of inclination is passed to the capture control unit 40.

Both the orientation sensor 60 and the tilt sensor 71 can detect information regarding the attitude of the satellite communication device 1. That is, the orientation sensor 60 and the tilt sensor 71 have a function as an attitude sensor. The directional information output from the directional sensor 60 and the amount of tilt output from the tilt sensor 71 can be used as an index indicating the attitude of the satellite communication device 1.

The user input device 80 is a user interface for inputting an instruction from a user related to automatic acquisition control. The user input device 80 includes, for example, a touch panel for selecting a satellite to be captured.

The display device 90 displays information related to automatic capture control. For example, the current processing status (calibration, satellite acquisition, tracking, etc.) may be displayed by an LED (Light Emitting Diode). Alternatively, the capture results such as capture success and capture failure may be displayed on the liquid crystal panel together with the end code. The speaker 100 notifies the user of information related to the automatic acquisition control by sound.

The acquisition control unit 40 instructs the motor control unit 30 of the azimuth angle, elevation angle, and polarization angle of the antenna 10, and detects the angle at which the reception sensitivity of the received signal peaks to acquire the target communication satellite. The acquisition control unit 40 includes a satellite search unit 41, a direction calculation unit 43, a re-execution control unit 45, and a storage unit 44. Of these, the storage unit 44 stores the directional information 44a and the satellite target angle table 44b.

FIG. 4 is a diagram showing an example of the directional information 44a. The azimuth information 44a is information in which the azimuth angle (direction information) of the satellite communication device 1 measured by the azimuth sensor 60 and the geomagnetic strength are associated with each other. The azimuth angle [°] and the geomagnetic strength [microtesla] may be recorded in association with the measurement type (initial, rotation, etc.) and the measurement time.

FIG. 5 is a diagram showing an example of the satellite target angle table 44b. The satellite target angle table 44b is a table in which position information (for example, latitude, longitude) on the ground is associated with satellite target angles (azimuth, elevation, polarization angle) of a communication satellite to be captured. For example, as shown in FIG. 5, the latitude of Sapporo City, Hokkaido is 141.4 °, the longitude is 43.1 °, and the target angle of the communication satellite A at this position is (azimuth, elevation, polarization angle) =. (151.2 °, 36.1 °, 10.4 °).

The explanation will be continued by returning to FIG. The satellite search unit 41 adjusts the angle of the antenna 10 while monitoring the intensity of the received radio wave from the satellite, and searches for the peak position of the received radio wave intensity to acquire the satellite. A series of sequences for adjusting the directivity direction of the antenna 10 within the search range based on the received radio wave intensity is referred to as an automatic adjustment procedure.

That is, the satellite search unit 41 acquires the satellite target angle corresponding to the position acquired by the position sensor 70 from the satellite target angle table 44b. Then, a search range including the satellite target angle is set, and the antenna 10 is directed to this search range to search for an artificial satellite. At that time, the satellite search unit 41 controls the directivity direction of the antenna 10 based on the directional information acquired by the directional sensor 60, and searches the search range.
The azimuth calculation unit 43 calculates the azimuth angle of the antenna 10, which changes with the rotation of the antenna 10 around the three axes.

The re-execution control unit 45 acquires the received radio wave intensity from the received radio wave intensity calculation unit, acquires the directional information from the directional sensor 60, and acquires the inclination amount from the inclination sensor 71. Then, when the reception intensity becomes equal to or less than the specified value and the amount of change in the attitude of the satellite communication device 1 becomes equal to or more than the threshold value after the automatic adjustment procedure by the satellite search unit 41 is completed, the re-execution control unit 45 reaches. A trigger is given to the satellite search unit 41 to re-execute (retry) the automatic adjustment procedure. It should be noted that the case where the amount of change in posture exceeds the threshold value means the case where the amount of change in the amount of inclination exceeds the threshold value, the case where the amount of change in directional information exceeds the threshold value, or both cases. When including. Next, an embodiment of the present invention will be described based on the above configuration.

[First Embodiment]
FIG. 6 is a flowchart showing an example of the processing procedure of the satellite communication device 1 in the first embodiment. The procedure shown in FIG. 6 is carried out in the preparatory step before the satellite communication device 1 is installed in a predetermined place and the operation is started.

In FIG. 6, the satellite communication device 1 uses the position sensor 70 to detect the longitude and latitude of the place where it is installed (step S10).

Next, the satellite communication device 1 searches the satellite target angle table 44b from the latitude and longitude of the position information detected in step S10, and determines the azimuth angle, elevation angle, and polarization angle of the satellite to be captured (step S11). .. Here, the satellite to be captured may be preset in the device or may be selected from the user input device 80.

Next, the satellite communication device 1 acquires the inclination angle from the inclination sensor 71, and acquires the azimuth angle of the antenna 10 from the azimuth sensor 60. The acquired tilt angle data is stored in the storage unit 44. By the process up to this point, the attitude of the satellite communication device 1 can be determined (step S12). That is, it is possible to grasp in which direction the satellite communication device 1 and the antenna 10 are facing. Next, the satellite communication device 1 determines the directivity direction of the antenna 10 based on the current antenna direction and the satellite target angle (step S13).

Next, the satellite communication device 1 executes the satellite acquisition sequence based on the determined directivity direction of the antenna 10 (step S14). In the satellite acquisition sequence (automatic adjustment procedure), the satellite communication device 1 adjusts the directivity direction of the antenna 10 within the search range including the satellite target angle based on the received radio wave intensity. Then, if the received power equal to or higher than a certain value can be obtained, the satellite acquisition sequence is completed (Yes in step S15), and the mode shifts to the operation mode.

Even after shifting to the operation mode, environmental conditions such as weather conditions and radio wave environment conditions change from moment to moment. In some cases, it is necessary to re-execute the satellite acquisition sequence (satellite reacquisition sequence), but I want to correctly determine whether it is really necessary. Therefore, a plurality of embodiments will be described below with respect to the process of determining whether or not to activate the satellite reacquisition sequence.

FIG. 7 is a flowchart showing an example of a processing procedure in the operation mode after the automatic adjustment procedure of the first embodiment is completed. In FIG. 7, the satellite communication device 1 acquires the received radio wave intensity (step S20), and if the value is equal to or less than the specified value (Yes in step S21), the satellite communication device 1 acquires the inclination angle data from the inclination sensor 71 and stores the storage unit 44. Compare with the tilt angle data stored in. Thereby, the amount of change between the tilt angle data acquired in step S14 of FIG. 6 and the latest tilt angle data can be calculated. If this amount of change is lower than the threshold value (No in step S23), the processing procedure returns to step S20 again.

On the other hand, if the amount of change in the tilt angle is equal to or greater than the threshold value (Yes in step S23), the satellite communication device 1 starts the satellite reacquisition sequence (Step S24) and waits for its completion (Yes in step S25). The mode continues again.

As described above, in the first embodiment, when a decrease in received power is detected, instead of blindly invoking the satellite reacquisition sequence immediately, a procedure for once determining the amount of change in the tilt angle as a threshold value is performed. prepare. Then, if the amount of change in the tilt angle is equal to or greater than the threshold value, the satellite reacquisition sequence is activated for the first time. As described above, in the first embodiment, the judgment is made based on two different judgment criteria.

Existing technology relies solely on received signal strength as a clue to adjust the antenna directivity. That is, as soon as the radio wave arriving at the antenna 10 becomes weak, the retry sequence is activated, and the antenna directivity must be readjusted from the beginning. If only the received power is used as a determination criterion in this way, the automatic adjustment procedure will be started immediately even if the antenna 10 is temporarily shielded.

On the other hand, in the first embodiment, in addition to the received power, a change in the tilt angle is also detected, and when there is a change in the tilt angle, it is determined that the antenna orientation has changed, and an automatic adjustment procedure is performed. As a result, it is possible to prevent the readjustment procedure of the antenna directivity from being inadvertently started. Therefore, unnecessary satellite automatic recapture operation is suppressed, and the period during which the service cannot be provided can be eliminated as much as possible.

Moreover, in the first embodiment, the tilt sensor 71 is used to acquire tilt data. Since the tilt sensor originally provided in the satellite communication device 1 can be used, there is no need to add a new device, and there is no possibility that the cost, weight, volume, etc. of the device will increase.

[Second Embodiment]
FIG. 8 is a diagram showing an example of time variation of the received power of the radio wave from the satellite in the second embodiment. As shown, the reception intensity of radio waves from satellites may temporarily decrease. In the past, when the received radio wave intensity decreased, the automatic adjustment procedure was started immediately after [Δt seconds] at most about 1 second.

In some cases, such as the A curve, the received signal strength does not recover as it is. However, as shown in the B-curve, the received signal strength may be restored immediately after the start of the automatic adjustment procedure. Conventionally, even in a case such as a B curve, the automatic adjustment procedure has already been started, and the time spent for it is wasted.

Therefore, in the second embodiment, when the reception intensity becomes equal to or less than the specified value and the predetermined time (for example, about 10 seconds to several minutes) elapses in that state, the automatic adjustment procedure of the antenna directivity is executed again. I made it. As a result, when the received radio wave intensity is restored in a short period of time, the automatic adjustment procedure is no longer executed, and the same effect as that of the first embodiment can be obtained.

[Third Embodiment]
FIG. 9 is a flowchart showing an example of a processing procedure in the operation mode after the automatic adjustment procedure in the third embodiment is completed. In FIG. 9, the same steps as in FIG. 7 are designated by the same reference numerals, and only different matters will be described here.

The procedure shown in FIG. 9 starts with acquiring the tilt data of the tilt sensor 71. Then, when the amount of change in the amount of inclination from the previous time is equal to or greater than the specified value, the received radio wave intensity is acquired and the threshold value is determined. That is, when the amount of change in the amount of inclination is equal to or greater than the threshold value and the received radio wave intensity is equal to or less than the specified value, the automatic adjustment procedure is executed again.

Simply detecting the amount of change in the amount of inclination by the inclination sensor 71 may activate an unnecessary automatic adjustment procedure even when the antenna 10 returns to its original position. Therefore, in the third embodiment, the received power is confirmed after capturing the change in the data of the tilt sensor 71. Then, when the received power is equal to or less than the specified value, it is determined that the antenna direction has changed, and the automatic adjustment procedure is performed. Even in this way, it is possible to prevent the readjustment procedure of the antenna directivity from being inadvertently started.

[Fourth Embodiment]
FIG. 10 is a flowchart showing an example of a processing procedure in the operation mode after the automatic adjustment procedure in the fourth embodiment is completed. In FIG. 10, the same steps as in FIG. 7 are designated by the same reference numerals, and only different matters will be described here.

The procedure shown in FIG. 10 is obtained by providing the steps of step S26 and step S27 after step S23 shown in FIG. 7. When it is determined in step S23 that the amount of change in the tilt amount is equal to or greater than the threshold value, the satellite communication device 1 acquires the data of the directional sensor 60 (step S26). Then, the directional information 44a of the directional sensor 60 stored in the storage unit 44 is compared with the latest directional information, and if the amount of change is equal to or greater than the threshold value, the satellite communication device 1 starts the satellite reacquisition sequence (step). S24).

The tilt sensor 71 may not be able to detect slow changes in tilt. Therefore, in the fourth embodiment, the directional sensor 60 is further used in combination with the result of the threshold value determination of the received power to determine whether or not the automatic adjustment procedure can be restarted. In the fourth embodiment, since the determination criteria over three stages are provided, it is possible to prevent the readjustment procedure of the antenna directivity from being inadvertently started with higher accuracy.

The present invention is not limited to the above embodiment. For example, in the fourth embodiment, as shown in the flowchart of FIG. 10, the determination based on the amount of change in the inclination data and the determination based on the amount of change in the directional information are connected by an AND condition (logical product). Instead of this, the determination based on the amount of change in the inclination data and the determination based on the amount of change in the directional information may be connected by an or condition (logical sum).

That is, the satellite reacquisition sequence is started when the received radio wave intensity becomes equal to or less than the specified value and at least one of the amount of change in the tilt data and the amount of change in the directional information becomes equal to or more than the threshold value. Is also good. In this way, the accuracy of the tilt sensor 71 and the accuracy of the directional sensor 60 can be complemented with each other. In particular, if a relatively inexpensive magnetic sensor is used as the directional sensor, the desired accuracy may not be obtained. In such a case, if the data of the tilt sensor 71 is used, a higher accuracy determination can be made.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... satellite communication device, 10 ... antenna, 11 ... main body, 12 ... tripod, 13b ... support, 13c ... support, 14 ... power button, 15 ... capture button, 18 ... transmitter / receiver, 20 ... motor, 20a ... motor, 20b ... Motor, 20c ... Motor, 30 ... Motor control unit, 40 ... Capture control unit, 41 ... Satellite search unit, 43 ... Direction calculation unit, 44 ... Storage unit, 44a ... Direction information, 44b ... Satellite target angle table, 45 ... Re-execution control unit, 50 ... Received radio wave strength calculation unit, 60 ... Direction sensor, 70 ... Position sensor, 71 ... Tilt sensor, 80 ... User input device, 90 ... Display device, 100 ... Speaker, 111, 114-11n ... Fixed station, 112 ... in-vehicle station, 113 ... portable station, 202 ... motor control unit.

Claims (6)

An antenna that receives radio waves from artificial satellites and
A reception radio wave strength calculation unit that calculates the reception strength of the radio wave, and
A position sensor that acquires position information at the installation location,
An inclination sensor that acquires the amount of inclination at the installation location,
A directional sensor that acquires the directional information of the antenna and
The search range of the artificial satellite from the installation location is determined based on the acquired position information, and the direction of the antenna is determined based on the reception intensity calculated by the received radio wave intensity calculation unit within this search range. A satellite search unit that executes an automatic adjustment procedure to adjust the direction,
After the automatic adjustment procedure is completed and a decrease in the reception intensity to the specified value or less is detected, the change amount of the inclination amount is compared with the threshold value, and the inclination amount becomes equal to or more than the threshold value. A satellite acquisition device including a re-execution control unit that acquires the directional information and re-executes the automatic adjustment procedure if the amount of change in the directional information is equal to or greater than a threshold value. An antenna that receives radio waves from artificial satellites and
A reception radio wave strength calculation unit that calculates the reception strength of the radio wave, and
A position sensor that acquires position information at the installation location,
An inclination sensor that acquires the amount of inclination at the installation location,
A directional sensor that acquires the directional information of the antenna and
The search range of the artificial satellite from the installation location is determined based on the acquired position information, and the direction of the antenna is determined based on the reception intensity calculated by the received radio wave intensity calculation unit within this search range. A satellite search unit that executes an automatic adjustment procedure to adjust the direction,
After the automatic adjustment procedure is completed, the reception intensity is equal to or less than the specified value and the inclination amount is equal to or more than the threshold value, or the reception intensity is equal to or less than the specified value. With the re-execution control unit that re-executes the automatic adjustment procedure when the amount of change in the orientation information exceeds the threshold value.
A satellite capture device equipped with. After the decrease in reception intensity is detected, the re-execution control unit compares the amount of change in the amount of inclination with the threshold value, and re-executes the automatic adjustment procedure when the amount of inclination becomes equal to or greater than the threshold value. The satellite capture device according to any one of claims 1 or 2. After the change in the inclination amount is detected, the re-execution control unit compares the reception intensity with the specified value, and re-executes the automatic adjustment procedure when the reception intensity becomes equal to or less than the specified value. , The satellite capture device according to any one of claims 1 or 2. A satellite acquisition method performed by a satellite acquisition device that has an antenna that receives radio waves from an artificial satellite.
The process of calculating the reception strength of the radio wave by the reception radio wave strength calculation unit, and
The process of acquiring position information at the installation location using the position sensor,
The process of acquiring the amount of inclination at the installation location using the inclination sensor,
The process of acquiring the directional information of the antenna by the directional sensor,
The satellite search unit determines the search range of the artificial satellite from the installation location based on the acquired position information, and adjusts the pointing direction of the antenna based on the reception intensity within this search range. The process of performing the automatic adjustment procedure for
After the automatic adjustment procedure is completed by the re-execution control unit, after the decrease in the reception intensity to the specified value or less is detected, the amount of change in the amount of inclination is compared with the threshold value, and the amount of inclination is calculated. When the threshold value is exceeded, the directional information is acquired, and if the amount of change in the directional information is equal to or greater than the threshold value, the automatic adjustment procedure is executed again.
A satellite acquisition method comprising. A satellite acquisition method performed by a satellite acquisition device that has an antenna that receives radio waves from an artificial satellite.
The process of calculating the reception strength of the radio wave by the reception radio wave strength calculation unit, and
The process of acquiring position information at the installation location using the position sensor,
The process of acquiring the amount of inclination at the installation location using the inclination sensor,
The process of acquiring the directional information of the antenna by the directional sensor,
The search range of the artificial satellite from the installation location is determined based on the position information acquired by the satellite search unit, and within this search range, based on the reception intensity calculated by the received radio wave strength calculation unit, The process of executing the automatic adjustment procedure for adjusting the direction of the antenna and
After the automatic adjustment procedure is completed by the re-execution control unit, when the reception intensity is equal to or less than the specified value and the inclination amount is equal to or more than the threshold value, or the reception intensity is equal to or less than the specified value. And when the amount of change in the directional information exceeds the threshold value, the process of re-executing the automatic adjustment procedure.
A satellite acquisition method comprising.

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