JPH0964630A - Satellite broadcasting receiving antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove oscillation in the intensity of received radio wave and to allow this antenna system to respond to the sudden directional change of a mobile object by controlling a receiving antenna, based upon the receiving intensity detection result of a tracking antenna. SOLUTION: A rotation control part 14 in a tracking antenna control part 1 rotates a tracking antenna 11 at a high speed and the angle of the antenna 11 is detected by an angle detection part 19. A peak angle detection part 18 detects the peak angle of the antenna 11 at a maximum S level in each revolution of the antenna 11 and sends the detected angle to a receiving antenna control part 2. A rotation control part 24 receives the sent peak angle and instructs a rotation mechanism part 22 to set up the direction of a receiving antenna 21 to a prescribed angle. The angle of the antenna 21 is detected by an angle detection part 29 and fed back to the control part 24 to set up the antenna 21 to the prescribed angle. The angle of the antenna 21 is corrected in each rotation of the antenna 11. Consequently, broadcasting receiving part 3 can receive a receiving radio wave at its maximum S level, the oscillation of the received radio wave can be removed and the antenna system can respond also to the sudden directional change of the mobile object.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiving system which is mounted on a moving body such as a vehicle and receives radio waves from a broadcasting satellite, and in particular, it always receives the best reception even when the direction of the moving body changes. The present invention relates to a satellite broadcast receiving antenna system that can be received in a state.

[0002]

2. Description of the Related Art FIG. 5 is a system configuration diagram for explaining a conventional satellite broadcast receiving system. FIG. 6 is a configuration diagram of an antenna for explaining a conventional satellite broadcast receiving system, (a) is a top view and (b) is a side view. Hereinafter, description will be given with reference to the drawings. In a moving body such as a vehicle, the direction of a broadcast satellite (hereinafter referred to as a satellite) to be received changes as the vehicle advances.
In order to receive satellite broadcasting in the best condition, it is necessary to control the receiving antenna so that it always points toward the satellite.

An antenna control unit 5 includes an antenna 51 for receiving radio waves from a satellite, a rotating mechanism 52 for rotating the antenna 51 by 360 °, an angle detection unit 59 for detecting the direction of the antenna 51, and a received radio wave corresponding to the antenna angle. Memory 55 for storing the strength of the antenna, a peak angle detector 56 for detecting the antenna angle at which the reception strength is maximum, a rotation controller 54 for controlling the rotation of the antenna 51, and a small angle rotation of the antenna 51 about a predetermined angle. The rotation control unit 53 is configured to change (change around a certain angle). The antenna 51 is adjusted to have a predetermined tilt angle with respect to the rotating table. This angle is determined by the position of the moving body (mainly latitude), and may be considered to change little during normal vehicle operation.

Reference numeral 6 denotes a broadcast receiving section, which includes a tuner section 61 for selecting the reception frequency of the radio wave received by the antenna 51, a detection section 62 for detecting the received radio wave, and a detection signal from the detection section 62 after being separated into video and audio, respectively. The audio amplification unit 63 for amplifying the signal of No. 1, the video amplification unit 65, the speaker 64 for reproducing audio and video, and the display unit 66 such as a CRT. next,
The operation will be described. During reception of the radio wave from the satellite, the rotation control unit 53 instructs the rotation mechanism 52 to always perform a minute angle rotation (change a minute angle around a certain angle). The radio wave received by the antenna 51 is received by the tuner unit 6
The frequency to be received is selected at 1 and detected by the detection unit 62. The detected signal is separated into an audio signal and a video signal. The audio signal is amplified by the audio amplifying unit 63 and the speaker 64.
Is reproduced as audio by the video signal, and the video signal is amplified by the video amplification section 65 and reproduced by the display section 66 as video.

On the other hand, the received radio wave is detected by the detector 62, and the received electric field strength S (signal) level signal is detected. Since the antenna 51 is constantly rotated by a small angle, the S level changes depending on the direction of the radio wave from the satellite depending on the rotation angle of the antenna 51. This S level signal is stored in the memory 55 corresponding to the antenna angle. The peak detector 56 detects the angle of the antenna 51 at which the S level becomes maximum. Then, the peak angle is input to the rotation control unit 54. The rotation control unit 54 instructs the rotation mechanism 52 to change the direction of the antenna 51, and again causes the antenna 51 to rotate by a small angle around that angle.
By repeating the above operation, the direction (angle) of the antenna is controlled to the angle at which the electric field strength (S level) is maximized for reception.

[0006]

In the above antenna angle control method, the direction of the antenna 51 is constantly changed, though it is a minute angle, in order to detect the direction in which the intensity of the received radio wave is maximized. Therefore, the strength of the received radio wave is constantly fluctuating. Further, if the angle at which the antenna 51 is rotated is increased, the strength of the received radio wave is affected, so only a small angle can be changed, and it is difficult to detect the antenna angle at which the electric field strength is the maximum. Furthermore, when the vehicle suddenly changes its direction at an intersection or the like, the antenna is rotated to detect the electric field strength, the peak of the S level is detected, and the rotation center of the antenna is set to the angle at which the S level is maximized. While fixing
The direction of the vehicle changes greatly and the peak of the S level deviates from the range of the turning angle. As a result, there is a problem that an accurate peak angle of the electric field strength cannot be detected, the antenna cannot track the satellite, and good reception cannot be performed.

According to the present invention, there is no intensity fluctuation in the received radio wave,
Moreover, it is an object of the present invention to provide a satellite broadcast receiving antenna system that can cope with a sudden change in direction of a moving body.

[0008]

In order to achieve the above object, the present invention provides a first antenna for receiving radio waves from a broadcasting satellite, and rotating means for rotating the first antenna.
A tracking antenna unit including a detection unit that detects a reception intensity of a radio wave from the broadcast satellite corresponding to a rotation angle of the first antenna; and a second antenna that receives a radio wave from the broadcast satellite. The receiving antenna section is provided with a control unit that controls the direction of the second antenna based on the detection result of the detection unit.

Further, the control means controls the direction of the second antenna according to the rotation angle of the first antenna from a predetermined position in a state where the first antenna can receive well. It is a feature. Further, the control means controls the direction of the second antenna based on an angle difference between the direction of the first antenna and the direction of the second antenna when the first antenna can receive well. It is characterized by.

[0010]

1 is a system configuration diagram for explaining a satellite broadcast receiving system according to an embodiment of the present invention. Hereinafter, description will be given with reference to the drawings. Reference numeral 1 is a tracking antenna control unit that detects the intensity of radio waves from the satellite. The tracking antenna 11 receives the radio waves from the satellite, the rotating mechanism 12 that rotates the tracking antenna 11 by 360 °, and the tracking antenna 11 receive it. A tuner unit 15 for selecting a reception frequency of a radio wave from a satellite, and an S level detection unit 1 for detecting a reception intensity by detecting a reception radio wave
6, a rotation mechanism 12 that rotates the tracking antenna 11 at high speed according to an instruction from the rotation control unit 14, an angle detection unit 19 that detects an angle of the tracking antenna 11, and an S level intensity corresponding to the tracking antenna angle. The memory 17 and the peak angle detector 18 for detecting the angle of the tracking antenna 11 that maximizes the S level.

Reference numeral 2 denotes a receiving antenna control unit for controlling the direction of the receiving antenna 21 in order to receive the electric wave from the satellite under the best conditions. The receiving antenna 21 and the receiving antenna 21 receive the electric wave from the satellite. 21 includes a rotation mechanism 22 capable of rotating 360 degrees, a rotation control unit 24 that controls the angle of the receiving antenna 21 according to the peak angle from the tracking antenna control unit 1, and an angle detection unit 29 that detects the angle of the receiving antenna 21. To be done. The tracking antenna 11 and the receiving antenna 21 are adjusted to have a predetermined tilt angle with respect to the rotating table. This angle is determined by the position of the moving body (mainly latitude), and may be considered to change little during normal vehicle operation.

Reference numeral 3 denotes a broadcast receiving unit for converting radio waves from the satellite received by the receiving antenna 21 into video and audio, a tuner unit 31 for selecting the receiving frequency of the radio wave received by the receiving antenna 21, and detecting the received radio waves. Detection unit 32, an audio amplification unit 33 that amplifies the detection signal from the detection unit 32 after separating the detection signal into video and audio, a video amplification unit 35, a speaker 34 that reproduces audio and video, and a display unit 36 such as a CRT.
It consists of.

2A and 2B are configuration diagrams of a tracking antenna for explaining a satellite broadcast receiving system according to an embodiment of the present invention. FIG. 2A is a top view and FIG. 2B is a side view. 4A and 4B are diagrams showing the relationship between the tracking antenna position and the S level of the satellite broadcast receiving system according to the embodiment of the present invention. FIG. 4A shows the relationship between the antenna position and the S level, and FIG. 4B shows the peak detection. It is a figure. The operation of the tracking antenna controller 1 will be described below.

In the tracking antenna control unit 1, the rotation control unit 14 rotates the tracking antenna 11 at a high speed (for example, 36
00 rpm). The angle of the tracking antenna 11 is always detected by the angle detector 19. The frequency of the radio wave received by the tracking antenna 11 is selected by the tuner unit 15 (same as the frequency of the tuner 31 of the broadcast receiving unit), and the S level detection unit 16 detects the S level. The S level from the S level detection unit 16 corresponding to the angle of the tracking antenna 11 detected by the angle detection unit 19 is stored in the memory 17 (see FIG. 4A). Every time the tracking antenna 11 makes one rotation, the peak angle detection unit 1 is calculated from the relationship between the angle of the tracking antenna 11 stored in the memory 17 and the S level.
8 detects the angle of the tracking antenna 11 that maximizes the S level (see FIG. 4B). This peak angle is sent to the receiving antenna control unit 2. The absolute angle of the peak angle may be transmitted to the receiving antenna control unit 2 as data, or the peak angle may be transmitted as the deviation angle from the previous position (angle).

3A and 3B are configuration diagrams of a receiving antenna for explaining a satellite broadcast receiving system according to an embodiment of the present invention. FIG. 3A is a top view and FIG. 3B is a side view. The operation of the receiving antenna controller 2 will be described below. In the receiving antenna control unit 2, the rotation control unit 24 receives the peak angle from the tracking antenna control unit 1. Then, the rotation control unit 24 instructs the rotation mechanism unit 22 so that the direction of the receiving antenna 21 becomes a predetermined angle. The angle of the receiving antenna 21 at that time is detected by the angle detector 29, and the rotation controller 24 constantly feeds back whether the angle is a predetermined angle. Thus, every time the tracking antenna 11 makes one rotation, the angle of the receiving antenna 21 is corrected once.

The broadcast receiving unit 3 receives radio waves from the satellite at the designated angle of the receiving antenna 21. In this antenna direction, the S level of the received radio wave is always the maximum, so that good reception is possible. As described above, in the present embodiment, the intensity of the received radio wave is maximized by separating the tracking antenna for detecting the antenna angle at which the intensity of the received radio wave is maximum and the receiving antenna for receiving the broadcast. Since the receiving antenna is controlled according to the antenna angle, it is possible to obtain a satellite broadcast receiving system in which the received radio waves do not fluctuate and which can cope with a sudden change in the direction of the moving body.

[0017]

As described above, according to the present invention, there is obtained a stable satellite broadcast receiving antenna system which does not fluctuate in the intensity of received radio waves and can cope with a sudden change in direction of a moving body.

[Brief description of drawings]

FIG. 1 is a system configuration diagram illustrating a satellite broadcast receiving system according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a tracking antenna unit for explaining a satellite broadcast receiving system according to an embodiment of the present invention, (a) is a top view,
(B) is a side view.

FIG. 3 is a configuration diagram of a receiving antenna section for explaining a satellite broadcast receiving system according to an embodiment of the present invention, (a) is a top view,
(B) is a side view.

FIG. 4 is a diagram illustrating a peak detection method of a tracking antenna of a satellite broadcast receiving system according to an embodiment of the present invention, FIG.
FIG. 3 is a diagram showing the relationship between antenna position and S level, and FIG.

FIG. 5 is a system configuration diagram illustrating a conventional satellite broadcast receiving system.

6A and 6B are diagrams showing a configuration of an antenna unit for explaining a conventional satellite broadcast receiving system, in which FIG. 6A is a top view and FIG. 6B is a side view.

[Explanation of symbols]

1 ... Tracking antenna controller 12, 22, ...
・ Rotation mechanism 2 ・ ・ ・ Reception antenna control unit 14, 24 ・ ・
・ Rotation controller 3 ・ ・ ・ Broadcast receiver 15, 31 ・ ・
-Tuner unit 11 ... Tracking antenna 16 ... S level detection unit 21 ... Reception antenna 32 ... Detection unit

Claims (3)

[Claims] 1. A first antenna for receiving radio waves from a broadcasting satellite, a rotating means for rotating the first antenna, and reception of radio waves from the broadcasting satellite corresponding to a rotation angle of the first antenna. A tracking antenna section including a detection unit that detects intensity; a second antenna that receives radio waves from the broadcasting satellite;
A satellite receiving antenna system, comprising: a receiving antenna section having a control means for controlling the direction of the second antenna based on the detection result of the detecting means. 2. The control means controls the direction of the second antenna according to a rotation angle of the first antenna from a predetermined position in a state where the first antenna can receive well. The satellite broadcast receiving antenna system according to claim 1. 3. The control means determines the direction of the second antenna based on the angular difference between the direction of the first antenna and the direction of the second antenna when the first antenna can receive well. The satellite broadcast receiving antenna system according to claim 1, which is controlled.