JPH02100522A - Satellite broadcasting receiver - Google Patents

Abstract

PURPOSE:To receive the satellite broadcasting of an adjacent country by providing a right-handed circularly polarized wave-linearly polarized wave converter and a left-handed circularly polarized wave-linearly polarized wave converter, providing a motor which rotated a parabolic antenna that automatically switches both converters by a feed radio wave in horizontal and vertical directions and controlling the motor by means of an AGC voltage. CONSTITUTION:Either the right-handed circularly polarized wave-linearly polarized wave converter 12 or the left-handed circularly polarized wave-linearly polarized wave converter 13 is automatically switched by selecting, a channel by a BS tuner 110, and a parabolic antenna part 15 starts rotating by a driving circuit B113 and the motor B112 at the same time as channel selection. Then, a microcomputer 19 holds the maximum value of the AGC voltage in an FM demodulator 17 while the parabolic antenna 15 rotates once, and fixes it the horizontal direction with the strongest maximum magnetic field. Next, the parabolic antenna 15 is rotated in the vertical direction by a driving circuit A114 and a motor A111, and a vertical angle direction with best directivity is decided, whereby the parabolic antenna 15 is automatically set in the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a receiving device for satellite broadcasting, which is expected to be used as new media.

2. Description of the Related Art In recent years, satellite broadcasting receiving systems have been used for high-definition television broadcasting, P
With the implementation of commercial audio broadcasts, etc., it is attracting attention as a leader in new media.

An example of the above-mentioned conventional satellite broadcast receiving system will be described below with reference to the drawings.

FIG. 2 shows a conventional parabolic antenna, and FIG. 3 shows a satellite broadcast receiving system using the parabolic antenna shown in FIG.

In FIG. 2, 21 is a reflecting mirror that receives radio waves from a broadcasting satellite. 22 is a primary radiator 4. 23 is a right-handed circularly polarized wave-to-linearly polarized wave converter, which converts the right-handed circularly polarized wave of the feed into the same linearly polarized wave as that for terrestrial broadcasting.

24 is a BS converter that converts the received 12 GHz band signal into a BS-IF signal frequency of the IGHz band.

25 is a mounting jig. Also, in Figure 3, 31
is a BS tuner that selects and repeats the desired channel three times, and also supplies 15 (V) to the BS converter 24. 32 is BS converter 24 and BS
This is a connection cable that connects the tuner 31.

The operation of the satellite broadcast receiving system configured as described above will be explained below.

First, in FIG. 3, the BS tuner 31 and the BS converter 24 are connected with the connection cable 32, and the parabolic antenna is set up in a direction with good directivity. In the case of domestic use, a reflector 21 receives the 12 low frequency band signals sent from a broadcasting satellite, and the primary broadcaster 22 collects the signals, and converts the radio waves sent with right-handed circular polarization into right-handed circularly polarized waves. - The linear polarization converter 23 converts the signal into a linear polarization, the BS converter 24 converts the frequency into an IGHz band signal, and transmits the signal to the BS tuner 31 via the connection cable 32. This BS tuner 31 performs channel selection and signal demodulation.

Problems to be Solved by the Invention However, in the above configuration, since there is only a right-handed circularly polarized wave-linearly polarized wave converter, only right-handed circularly polarized waves can be converted into linearly polarized waves, and parabolic waves can only be converted into linearly polarized waves. Since the antenna is fixed, it is not possible to easily change the direction of the parabolic antenna toward the broadcasting satellite, and there is a problem in that it is impossible to receive satellite broadcasts from neighboring countries sent using left-handed circularly polarized waves. was.

In view of the above-mentioned problems, the present invention provides a satellite broadcasting receiving system that can easily receive even left-handed circularly polarized waves from neighboring countries.

Means for Solving the Problems In order to solve the above problems, a satellite broadcasting receiving apparatus of the present invention includes a parabolic antenna equipped with a right-handed circularly polarized wave to linearly polarized wave converter and a left-handed circularly polarized wave to linearly polarized wave converter. , the re-converter is automatically switched by the transmitted radio wave, and it is equipped with a motor A and a drive circuit A that move the parabolic antenna in the vertical direction, and a motor B and a drive circuit B that rotate the parabolic antenna in the horizontal direction. Two drive circuits A.

This is characterized in that each of B is controlled by an AGC voltage.

Effects of the present invention With the above-described configuration, the direction of the parabolic antenna (azimuth angle, elevation angle) can be automatically adjusted to a direction with good directivity by recognizing and determining the direction (azimuth angle, elevation angle) using the AGC voltage. Whether it is a left-handed circularly polarized wave, the parabolic antenna is equipped with a right-handed and left-handed circularly polarized wave converter, so it can receive both waves, making it possible to receive satellite broadcasts from neighboring countries. .

Embodiment Hereinafter, a satellite broadcast receiving apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a satellite broadcast receiving apparatus according to an embodiment of the present invention. In FIG. 1, 10 is a reflecting mirror, 11 is a primary radiator, 12 is a right-handed circularly polarized wave-linear polarized wave converter, 13 is a left-handed circularly polarized wave-linear polarized wave converter, and 14 is each converter 12. .13 is a BS converter that receives the output as input, 15 is a parabolic antenna section, 16 is a BS-IF second mixer, 17 is an FM demodulator, 18 is a microcomputer for channel selection, 19 is a microcomputer in charge of other controls, 110 is the BS tuner, 111 is the motor A, 112 is the motor B, 1113 is the drive circuit B, 1
14 is a drive circuit A. By selecting a channel with the BS tuner 110, the right-handed circularly polarized wave-linear polarized wave converter 12
The left-handed circularly polarized wave - linearly polarized wave converter 13 automatically switches, and at the same time as the channel is selected, the parabolic antenna section 15 starts rotating horizontally by the drive circuit B113 and motor B112, and broadcasts during one rotation. Radio waves sent from the satellite are received by a reflector 10, collected by a primary radiator 11, converted into linearly polarized waves, frequency converted to an IGHz band by a BS converter 14, and transmitted to a BS tuner 110. Initially, while the parabolic antenna 15 rotates once, the maximum value of the AGC voltage of the FM demodulator 17 is held by the microcomputer 19,
Drive circuit B 113 and motor B 112 move the parabolic antenna 15 in the horizontal direction with the best maximum electric field strength (directivity).
The direction is fixed. Then, the drive circuit A 114 and the motor A 111 move the parabolic antenna 15 vertically.
The microcomputer 19 holds the maximum value of the AGC voltage during the 80' rotation, determines the vertical angle direction with the best directivity, and automatically installs the parabolic antenna 15 in that vertical direction.

Effects of the Invention As described above, according to the present invention, a parabolic antenna is equipped with a right-handed circularly polarized wave-linearly polarized wave converter and a left-handed circularly polarized wave-linearly polarized wave converter, and a bipolar converter can be converted with a transmitted radio wave. A first motor and a first drive circuit that automatically switch and rotate the parabolic antenna in a horizontal direction, and a second motor and a second drive circuit that rotate the parabolic antenna in a vertical direction, By controlling each of the two drive circuits with the AGC voltage obtained from the BS tuner, it is possible to receive satellite broadcasts from neighboring countries, and when receiving domestic satellite broadcasts, the parabolic antenna can be oriented in the direction with the best directivity. can be automatically directed to

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a satellite broadcast receiving apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of a conventional parabolic antenna, and FIG. 3 is a configuration diagram of a conventional satellite broadcast receiving system. 10... Reflector, 11... Primary radiator, 12... Right-handed circularly polarized wave-linear polarized wave converter, 13
...Left-handed circular polarization-linear polarization converter, 14...
... BS converter, 15 ... Parabolic antenna section, 110 ... BS tuner, 11111
2...Motor, 113.114...Motor drive circuit. Name of agent: Patent attorney Shigetaka Awano (1 person) 41 Figure 2 Figure I Figure 3

Claims (1)

[Claims] The parabolic antenna is equipped with two converters: a right-handed circularly polarized wave to linearly polarized wave converter and a left-handed circularly polarized wave to linearly polarized wave converter, and the output of one of the converters is selected depending on the channel selection. is configured to supply the BS tuner to the BS tuner, and
A first motor and a first drive circuit that move the parabolic antenna in a vertical direction, and a second motor and a second drive circuit that rotate the parabolic antenna in a horizontal direction,
Based on the AGC voltage obtained by the BS tuner, the first
A satellite broadcast receiving device characterized in that the second drive circuit is controlled.