JPH11355025A - Receiver device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiver device which can satisfactorily track a satellite and which can stably receive even if an antenna with less margin in a reception level or having a narrow directional half power angle in a vertical direction is used. SOLUTION: A vertical direction angle sensor 118 detecting the angle of the vertical direction of the installation position of an antenna 101 is installed in a position matching the directional boresight direction of the antenna 101. A reception level detection part 115 detects the level of the reception signal of the antenna 101. A vertical direction automatic track control part 119 controls the operation of a vertical direction motor driver 114 so that the boresight direction of the vertical side of a beam in the antenna 101 matches the direction of a satellite 250 based on the detection signal of the reception level detection part 115 and the detection signal of the sensor 118. Even if the angle of the vertical direction of the installation position of the antenna 101 changes, the boresight direction of the vertical side of the beam in the antenna 101 can instantaneously be turned to a satellite direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving apparatus which receives and processes signals from a broadcasting satellite or a communication satellite, and has a satellite automatic tracking antenna system. Specifically, in addition to the reception level of the signal from the satellite, by controlling the vertical direction of the beam of the antenna to match the satellite direction based on the detection signal of the vertical angle sensor, the reception level as an antenna is reduced. Antenna with small margin,
Even when using an antenna with a narrow directivity half-value angle in the vertical direction,
The present invention relates to a receiver capable of satisfactorily tracking a satellite and performing a stable reception operation.

[0002]

2. Description of the Related Art In recent years, broadcasting satellites (BSs)
atellite) and communication satellite (CS: communic)
Satellite broadcasting such as broadcasting using a communication satellite, or satellite communication using a communication satellite is becoming widespread. In such satellite broadcasting or satellite communication, for example, in a receiving device or a transmitting / receiving device mounted on a mobile body, an automatic tracking antenna system is used in order to always direct the beam direction of the antenna to the satellite and perform stable transmission / reception. It is necessary to provide.

FIG. 7 shows a configuration of a transmitting / receiving apparatus 200 including a conventional automatic tracking antenna system. The transmission / reception device 200 is mounted on, for example, a vehicle as a moving body, and its antenna is mounted on a roof of the vehicle.
The boresight directions on the horizontal and vertical sides of the beam are arranged so as to be changeable.

The transmitting / receiving apparatus 200 receives a signal Sr from a satellite 250 and transmits a signal St to the satellite 250. The antenna 201 performs demodulation processing and the like on a signal received by the antenna 201 to perform video processing. A receiver 202 for obtaining the signal Vr, a television monitor 203 for displaying an image based on the video signal Vr, a television camera 204 for obtaining the video signal Vt, and a signal to be transmitted by performing a modulation process or the like on the video signal Vt Transmitter 205 for obtaining St
And

[0005] Further, the transmitting / receiving device 200 is provided with an antenna 20.
The horizontal boresight direction of one beam is
1, a horizontal motor 211 for mechanically changing the horizontal direction by rotating the motor 1, a horizontal motor driver 212 for driving the motor 211, and an antenna 2
01, the boresight direction on the vertical side of the beam
It has a vertical motor 213 for mechanically changing the motor 01 by rotating it in the vertical direction, and a vertical motor driver 214 for driving the motor 213.

[0006] Further, the transmitting and receiving apparatus 200 includes an antenna 20.
1 reception level detection unit 21 for detecting the level of the reception signal
5 and a horizontal angle sensor 216 for detecting the installation position of the antenna 201, that is, the horizontal angle of the roof of the automobile.
And the antenna 201 based on the detection signal of the reception level detection unit 215 and the detection signal of the horizontal angle sensor 216.
Based on the detection signal of the horizontal automatic tracking control unit 217 for controlling the operation of the horizontal motor driver 212 and the detection signal of the reception level detection unit 215 so that the boresight direction of the horizontal side of the beam coincides with the direction of the satellite, It has a vertical automatic tracking control unit 218 that controls the operation of the vertical motor driver 214 so that the boresight direction on the vertical side of the beam of the antenna 201 matches the direction of the satellite.

Here, the horizontal motor 211, horizontal motor driver 212, vertical motor 213, vertical motor driver 214, reception level detector 215, horizontal angle sensor 216, horizontal automatic tracking controller 21
7 and the vertical direction automatic tracking control unit 218 constitute an automatic tracking antenna system.

The operation of the transmitting / receiving apparatus 200 shown in FIG. 7 will be described.

The signal Sr from the satellite 250 is transmitted to the antenna 20
1 and the signal received by the antenna 201 is supplied to the receiver 202. In the receiver 202, a demodulation process or the like is performed on the received signal to obtain a video signal Vr.
Then, the video signal Vr is supplied to the television monitor 203, and an image based on the video signal Vr is displayed on the television monitor 203.

[0010] A video signal Vt obtained by imaging with the television camera 204 is supplied to a transmitter 205.
In the transmitter 205, modulation processing and the like are performed on the video signal Vt to obtain a transmission signal St. Then, the transmission signal St is transmitted to the satellite 250 via the antenna 201.

Next, the operation of the automatic tracking antenna system will be described. The reception level detected by the reception level detection unit 215 is maximum when the beam boresight direction of the antenna 201 coincides with the direction of the satellite 250, and decreases as the position shifts. Therefore, the horizontal automatic tracking control unit 21
Reference numeral 7 denotes a horizontal motor driver 212 so that the reception level detected by the reception level detection unit 215 always becomes the maximum.
Is controlled so that the horizontal boresight direction of the beam of the antenna 201 coincides with the direction of the satellite 250. As a result, automatic tracking of the antenna 201 in the horizontal direction with respect to the satellite 250 is performed.

Further, the horizontal automatic tracking control unit 217
Controls the operation of the horizontal motor driver 212 when the horizontal angle of the installation position of the antenna 201 detected by the horizontal angle sensor 216 changes, and the horizontal boresight direction of the beam of the antenna 201 is The state corresponding to the direction of 250 is maintained. Thereby, even if there is a change in the horizontal angle of the installation position of the antenna 201, automatic horizontal tracking of the antenna 201 with respect to the satellite 250 can be continuously performed.

Further, the vertical automatic tracking control unit 218 includes:
The operation of the vertical motor driver 214 is controlled so that the reception level detected by the reception level detection unit 215 always becomes the maximum so that the boresight direction on the vertical side of the beam of the antenna 201 matches the direction of the satellite 250. I do. As a result, automatic tracking of the antenna 201 in the vertical direction with respect to the satellite 250 is performed.

[0014]

In the transmitting / receiving apparatus 200 shown in FIG. 7, the vertical automatic tracking control unit 218
The operation of the vertical motor driver 214 is controlled based only on the detection signal of the reception level detection unit 215. Therefore, when the antenna 201 is an antenna with a small reception level such as a small antenna or an antenna with a narrow directivity half-value angle in the vertical direction, if the installation position of the antenna 201 has a relatively large vertical angle change. However, there is a problem that the satellite 250 cannot be tracked instantaneously, and transmission and reception are interrupted.

In view of the above, in the present invention, satellite tracking can be performed satisfactorily even if an antenna having a small margin in the reception level, an antenna having a narrow directivity half-value angle, or the like is used. It is an object of the present invention to provide a receiving apparatus capable of performing a stable receiving operation.

[0016]

A receiving apparatus according to the present invention includes an antenna for receiving a signal from a satellite, a receiver for processing a signal received by the antenna, and a boresight direction on a vertical side of a beam of the antenna. A first beam direction changing means for changing, a reception level detecting means for detecting a level of a signal received by the antenna, a vertical angle sensor for detecting a vertical angle of an installation position of the antenna, and a vertical angle sensor. Vertical automatic tracking based on the detection signal and the detection signal of the reception level detection means for controlling the operation of the first beam direction changing means such that the boresight direction on the vertical side of the antenna beam coincides with the direction of the satellite. Control means.

In the present invention, the vertical boresight direction of the beam of the antenna is controlled based on the detection signal of the vertical angle sensor and the reception level of the signal from the satellite so as to coincide with the satellite direction. Therefore, automatic tracking of the antenna in the vertical direction with respect to the satellite is performed, and automatic tracking of the antenna in the vertical direction with respect to the satellite can be continuously performed even if the installation position of the antenna changes in the vertical direction. Thus, even if an antenna having a small reception level margin, an antenna having a narrow directivity half-value angle in the vertical direction, or the like is used as an antenna, satellite tracking can be performed favorably, and a stable reception operation can be performed.

For example, the direction of the beam boresight of the antenna may be changed mechanically using a motor or the like on both the horizontal and vertical sides. Further, for example, an electronic scanning array antenna such as a phased array antenna may be used as the antenna, and the beam boresight direction may be changed mechanically in the horizontal direction and electrically in the vertical direction.

The vertical angle sensor is disposed at a position that always coincides with the horizontal boresight direction of the antenna beam. Therefore, the vertical angle sensor can always correctly detect the vertical angle of the installation position of the antenna with respect to the satellite direction. Thus, when there is a vertical angle change in the installation position of the antenna, the control of the beam direction of the antenna is performed correctly.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a transmitting / receiving apparatus 100 including an automatic tracking antenna system according to a first embodiment. The transmitting / receiving device 100 is mounted on a vehicle as a moving body, and its antenna is arranged on a roof of the vehicle so that the directions of the horizontal and vertical sides of the beam can be respectively changed.

The transmitting / receiving apparatus 100 receives the signal Sr from the satellite 250 and transmits the signal St to the satellite 250. The antenna 101 performs demodulation processing and the like on the signal received by the antenna 101, and performs video processing. A receiver 102 for obtaining the signal Vr, a television monitor 103 for displaying an image based on the video signal Vr, a television camera 104 for obtaining the video signal Vt, and a signal to be transmitted by performing a modulation process or the like on the video signal Vt Transmitter 105 for obtaining St
And

Further, the transmitting / receiving apparatus 100 includes an antenna 10
The direction of the boresight on the horizontal side of the beam 1 is
A horizontal motor 111 for mechanically changing the antenna 1 by rotating it horizontally, a horizontal motor driver 112 for driving the motor 111, and an antenna 1
01 in the vertical boresight direction of the beam 1
It has a vertical motor 113 for mechanically changing the motor 113 by rotating it in the vertical direction, and a vertical motor driver 114 for driving the motor 113.

The transmitting / receiving apparatus 100 includes an antenna 10
1 reception level detection section 11 for detecting the level of the reception signal
5 and a horizontal angle sensor 116 for detecting the installation position of the antenna 101, that is, the horizontal angle of the roof of the automobile.
And the antenna 101 based on the detection signal of the reception level detection unit 115 and the detection signal of the horizontal angle sensor 116.
And a horizontal automatic tracking control unit 117 for controlling the operation of the horizontal motor driver 112 such that the boresight direction of the horizontal side of the beam coincides with the satellite direction.

Here, as the horizontal direction angle sensor 116, for example, an angular velocity sensor is used, and angle information is obtained by integrating a detection signal of the angular velocity sensor. However, the present invention is not limited to this, and other configurations may be used as long as horizontal angle information of the installation position of the antenna 101 can be obtained.

The transmitting / receiving apparatus 100 includes an antenna 10
(1) The vertical position of the beam of the antenna 101 based on the installation position, that is, the vertical angle sensor 118 for detecting the vertical angle of the roof of the car, And a vertical direction automatic tracking control unit 119 for controlling the operation of the vertical direction motor driver 114 so that the boresight direction of the vertical direction coincides with the satellite direction.

Here, as the vertical direction angle sensor 118, for example, an angular velocity sensor is used, and the angle information is obtained by integrating the detection signal of the angular velocity sensor. However, the present invention is not limited to this, and other configurations may be used as long as vertical angle information of the installation position of the antenna 101 can be obtained. For example, a configuration using an inclination sensor or the like may be used.

Next, a mounting mechanism for the antenna 101 and the like will be described with reference to FIGS. Car 150
Of the disk-shaped antenna system bottom plate 15
2 is attached. A horizontal angle sensor 116 is attached to the bottom plate 152 in front of the automobile 150.
Thus, the horizontal angle sensor 116 detects the installation position of the antenna 101, that is, the horizontal angle of the roof 151 of the automobile 150.

Also, the antenna system bottom plate 152 includes:
The bottom plate 152 is rotated about a rotation shaft 153 projecting vertically, and a disk-shaped horizontal rotation unit 154 parallel to the bottom plate 152 is attached. This horizontal rotating part 15
4 is rotated by transmitting a rotational force from a rotating shaft 111a of a horizontal motor 111 (not shown in FIGS. 2 and 3) to a rotating shaft 153 via a belt 155.

The vertical motor 113 and the vertical motor 113 are disposed on the center of the horizontal rotation unit 154.
Disk-shaped vertical rotation unit 156 rotated in the vertical direction
Is attached. The vertical rotation unit 156
(Parabolic antenna) 101 is mounted on the center of the antenna. Note that a low noise amplifier 157 is added to the antenna 101, and a signal received by the antenna 101 is amplified by the amplifier 157 and then the receiver 102 (FIG. 1).
).

A vertical angle sensor 118 is attached to the horizontal rotation unit 154. In this case, the vertical angle sensor 118 is attached in the directional boresight direction P of the antenna 101. That is, the vertical angle sensor 118 is arranged at a position that matches the boresight direction of the beam of the antenna 101 on the horizontal side. As a result, the vertical angle sensor 118 detects the installation position of the antenna 101, that is, the vertical angle of the roof 151 of the automobile 150.

The method of detecting the angle by the angle sensor has been described in which the output value of the angular velocity sensor is integrated. However, this integration may be performed by hardware, or the output value may be fetched into the CPU and converted into software. The processing may be performed. Furthermore, as another method, an acceleration sensor may be combined with the angular velocity sensor to correct the vertical angle when acceleration occurs. Further, the detection may be performed using only the acceleration sensor without combining the acceleration sensor and the angular velocity sensor.
In this case, a speed signal or the like from the vehicle is taken into the CPU and processed.

The vertical angle sensor 118 is connected to the antenna 10
Placed at a position that matches the horizontal direction of one beam,
That is, mounting the vertical angle sensor 118 at a position corresponding to the directional boresight direction of the antenna 101
In this way, the vertical angle of the installation position of the antenna 101 with respect to the direction of the satellite 250 is accurately detected, so that erroneous control of the vertical motor 113 is not performed.

In the vertical angle sensor 118, the voltage value of the detection signal at the time of horizontal (0 °) is generally a certain value. In this example, it is 3V. When the roof 151 of the automobile 150 has an upward slope, the voltage value of the detection signal of the angle sensor 118 becomes larger than a certain value. Conversely, when the roof 151 of the automobile 150 has a downward slope, the detection signal of the angle sensor 118 becomes large. Is smaller than a certain value. Therefore, by performing the rotation control of the vertical direction motor 113 in accordance with the voltage value, it becomes possible to perform automatic vertical tracking in which the boresight direction of the beam of the antenna 101 is always directed to the satellite.

As shown in FIG. 4A, the vertical angle sensor 1
When the antenna 18 is mounted in the directional boresight direction P of the antenna 101, as shown in FIG.
4C, the voltage value Ea of the detection signal of the angle sensor 118 becomes larger than 3 V and corresponds to the upward inclination angle + α with respect to the satellite direction. Therefore, by performing the rotation control of the vertical direction motor 113 in accordance with the voltage value Ea, it is possible to perform automatic vertical tracking in which the vertical boresight direction of the beam of the antenna 101 is always directed to the satellite.

On the other hand, as an extreme example, FIG.
5A, when the vertical angle sensor 118 is mounted in a direction opposite to the directional boresight direction P of the antenna 101, as shown in FIG.
When 1 is an upward slope, the voltage value Eb of the detection signal of the angle sensor 118 becomes smaller than 3 V as shown in FIG. 5C, and does not correspond to the upward slope angle + α with respect to the satellite direction, but the downward slope angle. −α. Therefore, when the rotation of the vertical motor 113 is controlled in accordance with the voltage value Eb, the rotation is controlled in the direction opposite to the direction to be controlled, and the vertical bore of the beam of the antenna 101 is controlled. The site direction cannot be turned to the satellite direction, and automatic tracking in the vertical direction becomes impossible.

Next, the operation of the transmitting / receiving apparatus 100 shown in FIG. 1 will be described.

The signal Sr from the satellite 250 is transmitted to the antenna 10
1 and the signal received by the antenna 101 is supplied to the receiver 102. In the receiver 102, a demodulation process or the like is performed on the received signal to obtain a video signal Vr.
Then, the video signal Vr is supplied to the television monitor 103, and an image based on the video signal Vr is displayed on the television monitor 103.

A video signal Vt obtained by imaging with the television camera 104 is supplied to a transmitter 105.
In the transmitter 105, a modulation process or the like is performed on the video signal Vt to obtain a transmission signal St. Then, the transmission signal St is transmitted to the satellite 250 via the antenna 101.

Next, the operation of the automatic tracking antenna system will be described. The reception level detected by the reception level detection unit 115 becomes maximum when the beam boresight direction of the antenna 101 coincides with the direction of the satellite 250, and decreases as the position shifts. Therefore, the horizontal automatic tracking control unit 11
7 is a horizontal motor driver 112 such that the reception level detected by the reception level detection unit 115 is always maximized.
Is controlled so that the horizontal boresight direction of the beam of the antenna 101 matches the direction of the satellite 250. As a result, automatic tracking of the antenna 101 with respect to the satellite 250 in the horizontal direction is performed.

Further, the horizontal automatic tracking control unit 117
Controls the operation of the horizontal motor driver 112 in accordance with the horizontal angle of the installation position of the antenna 101 based on the detection signal of the horizontal angle sensor 116, and adjusts the horizontal boresight direction of the beam of the antenna 101. Satellite 250
In the direction of. Thereby, the antenna 10
1, the horizontal boresight direction of the beam of the antenna 101 is instantaneously made to coincide with the direction of the satellite 250 even if there is a change in the horizontal angle of the installation position of the antenna 101. Automatic tracking can be continuously performed.

Further, the vertical automatic tracking control unit 119 includes:
The operation of the vertical motor driver 114 is controlled so that the reception level detected by the reception level detection unit 115 always becomes the maximum, and the boresight direction of the beam of the antenna 101 on the vertical side is made to coincide with the direction of the satellite 250. This allows
The automatic tracking of the antenna 101 in the vertical direction with respect to the satellite 250 is performed.

Further, the vertical automatic tracking control section 119
Controls the operation of the vertical motor driver 114 in accordance with the vertical angle of the installation position of the antenna 101 based on the detection signal of the vertical angle sensor 118 to change the boresight direction of the beam of the antenna 101 on the vertical side. Satellite 250
In the direction of. Thereby, the antenna 10
1, the vertical direction of the beam of the antenna 101 is instantaneously made to coincide with the direction of the satellite 250 even if there is a change in the vertical angle of the installation position of the antenna 1, and therefore, the automatic tracking of the antenna 101 with respect to the satellite 250 in the vertical direction is instantaneous. Becomes possible continuously.

As described above, in the transmitting and receiving apparatus 100 shown in FIG. 1, the boresight direction on the vertical side of the beam of the antenna 101 is determined by the vertical angle sensor 118 in addition to the reception level of the signal Sr from the satellite 250. Is controlled based on the detection signal of the antenna 101, even if there is a vertical angle change in the installation position of the antenna 101,
Can be instantaneously directed to the satellite 250. Therefore, the antenna 10
Even if an antenna with a small reception level, an antenna with a narrow directivity half-value angle in the vertical direction, or the like is used as 1, the satellite 250 can be satisfactorily tracked, and stable transmission and reception operations can be performed.

The vertical angle sensor 118 is arranged at a position that always coincides with the horizontal boresight direction of the beam of the antenna 101. Therefore, the vertical angle sensor 118 can always detect the vertical angle of the installation position of the antenna 101 with respect to the satellite direction,
When there is a vertical angle change in the installation position of the antenna 101, control of the beam boresight direction of the antenna 101 can be performed correctly, and tracking of the satellite 250 in the vertical direction can be performed well.

Next, a second embodiment of the present invention will be described. FIG. 6 shows a configuration of a transmitting / receiving apparatus 100A including an automatic tracking antenna system according to a second embodiment. 6, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

This transmitting / receiving apparatus 100A is an electronic scanning array composed of a plurality of antenna elements 101a, a plurality of phase shifters 101b and a combiner (distributor) 101c instead of the antenna 101 in the transmitting / receiving apparatus 100 shown in FIG. Phased array antenna 101A as antenna
Is used.

Here, the change of the boresight direction on the horizontal side of the beam of the antenna 101A is mechanically performed by using the horizontal motor 111 as in the case of the antenna 101. The change of the boresight direction on the vertical side of the beam of the antenna 101A is performed by the vertical phase shifter driver 12.
This is performed by controlling the phase shift amounts of the plurality of phase shifters 101b by 0. Therefore, in the transmitting / receiving device 100A, the vertical direction automatic tracking control unit 119 is configured to control the operation of the vertical direction phase shifter driver 120.

Other configurations of the transmitting / receiving apparatus 110A shown in FIG. 6 are the same as those of the transmitting / receiving apparatus 110 shown in FIG.
Therefore, the transmitting and receiving device 110A shown in FIG. 6 operates in the same manner as the transmitting and receiving device 110 shown in FIG. 1, and can obtain the same operation and effect. Further, the transmitting and receiving apparatus 1 shown in FIG.
10A changes the boresight direction of the beam of the antenna 101A on the vertical side by controlling the amount of phase shift of the plurality of phase shifters 101b. There is no need to provide a rotating part (see FIGS. 2 and 3), and there is an advantage that the mechanism can be simplified.

In the above embodiment, the tracking control in the horizontal direction and the tracking control in the vertical direction are independently performed. However, if necessary, the tracking control may be performed while relating the horizontal direction and the vertical direction. Good.

In the above-described embodiment, the present invention is applied to a transmitting / receiving apparatus for transmitting / receiving a video signal. However, the present invention is similarly applied to a transmitting / receiving apparatus for transmitting / receiving an audio signal and other data. it can.

In the above-described embodiment, the present invention is applied to a transmitting / receiving apparatus. However, the present invention can naturally be applied to a receiving apparatus having no transmitting means.

Further, in the above-described embodiment, the case where the phased array antenna is used as the electronic scanning array antenna has been described. However, the present invention relates to a transmitting / receiving apparatus using an electronic switching type electronic scanning array antenna such as a changeover switch. The same can be applied to the receiving device.

[0053]

According to the present invention, in addition to the reception level of the signal from the satellite, the boresight direction on the vertical side of the beam of the antenna matches the satellite direction based on the detection signal of the vertical angle sensor. To control. for that reason,
Even if there is a vertical angle change of the antenna installation position,
The boresight direction on the vertical side of the antenna beam can be instantaneously directed toward the satellite, and even if an antenna with a small reception level margin or an antenna with a narrow directional half-value angle in the vertical direction is used, the satellite can be tracked. Can be satisfactorily performed, and a stable receiving operation can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a transmission / reception device including an automatic tracking antenna system according to a first embodiment.

FIG. 2 is a plan view for explaining an attachment mechanism such as an antenna.

FIG. 3 is a side view for explaining an attachment mechanism such as an antenna.

FIG. 4 is a diagram for explaining a case where a vertical angle sensor is mounted in a direction of an antenna directivity boresight.

FIG. 5 is a diagram for explaining a case where the vertical angle sensor is not mounted in the direction of the antenna directivity boresight.

FIG. 6 is a block diagram illustrating a configuration of a transmission / reception device including an automatic tracking antenna system according to a second embodiment.

FIG. 7 is a block diagram illustrating a configuration of a transmission / reception device including a conventional automatic tracking antenna system.

[Explanation of symbols]

100, 100A: transmitting / receiving device, 101: antenna, 101A: phased array antenna, 10
2 ... receiver, 105 ... transmitter, 111 ... horizontal motor, 112 ... horizontal motor driver
113: vertical motor, 114: vertical motor driver, 115: reception level detection unit, 116
... Horizontal angle sensor, 117 ... Horizontal automatic tracking control unit, 118 ... Vertical angle sensor, 119
... Vertical direction automatic tracking control unit, 120 ... Vertical direction phase shifter driver, 150 ... Car, 151 ... Car roof, 152 ... Bottom plate of antenna system, 15
4: Horizontal rotation unit, 156: Vertical rotation unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Motonobu Moriya 2-6-3 Otemachi, Chiyoda-ku, Tokyo In-house New Nippon Steel Corporation (72) Inventor Makoto Ochiai 2-6-Otemachi, Chiyoda-ku, Tokyo No. 3 New Nippon Steel Corporation

Claims (5)

[Claims] An antenna for receiving a signal from a satellite; a receiver for processing a signal received by the antenna; first beam direction changing means for changing a boresight direction on a vertical side of a beam of the antenna; Reception level detection means for detecting a level of a signal received by the antenna; a vertical angle sensor for detecting a vertical angle of an installation position of the antenna; a detection signal of the vertical angle sensor and the reception level detection means Vertical direction automatic tracking control means for controlling the operation of the first beam direction changing means so that the boresight direction of the beam of the antenna on the vertical side coincides with the direction of the satellite based on the detection signal of A receiving device, comprising: 2. A second beam direction changing means for changing a horizontal boresight direction of a beam of the antenna, a horizontal angle sensor for detecting a horizontal angle of an installation position of the antenna, and the horizontal direction. The operation of the second beam direction changing means based on the detection signal of the angle sensor and the detection signal of the reception level detection means, so that the horizontal boresight direction of the antenna beam coincides with the direction of the satellite. The receiving apparatus according to claim 1, further comprising: a horizontal direction automatic tracking control unit that controls the horizontal direction. 3. The antenna according to claim 1, wherein the antenna is an electronic scanning array antenna, and the second beam direction changing means mechanically changes a boresight direction of a beam of the antenna on a horizontal side, and the first beam direction is changed. 3. The receiving apparatus according to claim 2, wherein the changing unit electrically changes a boresight direction on a vertical side of the beam of the antenna. 4. The receiver according to claim 1, wherein the vertical angle sensor is arranged at a position that always coincides with a horizontal boresight direction of the beam of the antenna. 5. The receiving apparatus according to claim 1, further comprising a transmitter for obtaining a transmission signal, wherein the transmission signal is transmitted from the antenna to the satellite.