JPH0738320A - Direction display device of satellite broadcasting antenna - Google Patents

Abstract

PURPOSE:To display a direction of the satellite broadcasting antenna on a coordinate plane. CONSTITUTION:This device consists of a horizontal direction phase difference detecting part 5 for detecting a phase difference of a radio wave in the horizontal direction, based on the right side sub-antenna 1, the left side sub-antenna 2, the upper side sub-antenna 3 and the lower side sub-antenna 4, whose pointing directions are allowed to coincide with that of a main antenna, and received radio waves by the right side sub-antenna 1 and the left side sub-antenna 2, a vertical direction phase difference detection part 6 for detecting a phase difference of a radio wave in the vertical direction, base on received radio waves by the upper side sub-antenna 3 and the lower side sub-antenna 4, a phase difference processing part 7 for converting the present pointing direction of the antenna to position data on a horizontal-vertical coordinate plane, base on a phase difference of the radio wave in the horizontal direction and a phase difference of the radio wave in the vertical direction outputted from the horizontal direction phase difference detecting part 5 and the vertical direction phase difference detecting part 6, and a display part 8 for converting position data on the horizontal-vertical coordinate plane to a display signal, and displaying together with a luminescent point and a coordinate for showing the present pointing direction of the antenna.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direction display device for a satellite broadcasting antenna for displaying the directions of CS and BS antennas on a coordinate plane.

[0002]

2. Description of the Related Art In order to receive a satellite broadcast with a good quality image, it is necessary to accurately orient the CS and BS antennas in the direction of the broadcasting satellite, and various devices are used to adjust the direction. For example, when a tuner for receiving satellite broadcasts has a level check terminal (AGC voltage output terminal), there is a method of adjusting the needle deflection with a tester so as to maximize it. In addition, CS and BS antenna output (IF signal)
There is also a method of inputting to the checker or the level checker to directly read the shake of the meter or the dB value and adjust the direction by the absolute value. Furthermore, there is also a method of measuring the CN ratio and adjusting the direction. However, the conventional method is to adjust the direction by trial and error by repeating the method of changing the direction of the antenna while observing the vibration of the meter or the numerical value, and the fluctuation of the meter or the numerical value is directly related to the direction of the antenna. There was no problem, so there was a problem that easy and quick adjustment was difficult.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. The vertical direction and the horizontal direction of the satellite are the vertical axis and the vertical direction is the vertical axis. By displaying coordinates on the horizontal axis,
It is an object of the present invention to provide a direction display device for a satellite broadcasting antenna, in which the current direction of the antenna is represented by a bright spot on a coordinate plane, and the direction of the antenna can be easily visually recognized.

[0004]

In order to achieve the above-mentioned object, at least two horizontal sub-antennas and two vertical sub-antennas whose directional directions coincide with those of a main antenna, and a phase difference between horizontal radio waves are provided. The horizontal phase difference detection unit that detects the phase difference, the vertical direction phase difference detection unit that detects the phase difference between the radio waves in the vertical direction, and the antenna direction on the horizontal-vertical coordinate plane based on the horizontal phase difference and the vertical phase difference. The phase difference processing unit for converting the position data into a display signal and the display unit for converting the position data into a display signal and displaying it as a bright spot on the coordinate plane.

[0005]

With the above configuration, the satellites are installed at a certain incident angle to each of the two sub-antennas that are installed so as to have the same directivity direction as the main antenna, for example, two sub-antennas that are horizontally separated by a predetermined distance. When the broadcast wave is incident, if the incident angle is zero (the sub-antenna perfectly matches the direction of the satellite), the phase difference of the incident radio wave between the two sub-antennas becomes zero. In addition, when the absolute value of the incident angle increases (the sub-antenna moves away from the satellite direction in the + direction or − direction),
The absolute value of the phase difference of the incident radio waves between the two sub antennas increases.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A direction display device for a satellite broadcasting antenna according to the present invention will be described in detail below with reference to the drawings. Figure 1
1 is a block diagram of an embodiment of a direction display device for a satellite broadcasting antenna according to the present invention. 1 is a right side sub (sub) antenna whose direction is matched with that of the main antenna, 2 is a left side sub (sub) antenna, 3 is an upper side sub (sub) antenna, and 4 is a lower side sub (sub) It is an antenna. These sub-antennas, for example, have a built-in down converter,
The received radio waves are converted into IF signals and output. Reference numeral 5 denotes a horizontal direction phase difference detection unit that amplifies the output (IF) signals of the right side sub-antenna 1 and the left side sub-antenna 2 to a predetermined level and detects a phase difference between horizontal radio waves based on the obtained signals. Is. Reference numeral 6 denotes a vertical direction phase difference detection that amplifies the output (IF) signals of the upper side sub-antenna 3 and the lower side sub-antenna 4 to a predetermined level and detects the phase difference of the radio waves in the vertical direction based on the obtained signal. It is a department. Reference numeral 7 denotes a shift in the current pointing direction of the antenna based on the phase difference between the horizontal radio wave and the vertical radio wave output by the horizontal phase difference detector 5 and the vertical phase difference detector 6. Is a phase difference processing unit that converts the data into position data on the horizontal-vertical coordinate plane. 8
Converts the position data on the horizontal-vertical coordinate plane into a display signal, and displays a bright spot representing the current deviation of the antenna pointing direction on the horizontal and vertical coordinate planes, for example, a display made of a liquid crystal panel or the like. It is a department.

FIG. 2 is a diagram showing the relationship between the received radio waves and the phase difference of the direction display device of the satellite broadcasting antenna according to the present invention. Main antenna 20 composed of parabolic antenna etc.
Then, at a predetermined distance L, the reference line 22 and the directivity direction of the main antenna 20 are matched, and, for example, two sub-antennas 21 composed of parabolic antennas installed in the horizontal direction are received. When the radio wave enters at the angle θ with the pointing direction, the phase difference Δφ is an amount (illustrated) related to the angle θ and the distance L between the two sub-antennas 21. Also,
The relationship between the angle in the vertical direction and the phase difference is similar.

FIG. 3 is an example of a display screen of the direction display device of the satellite broadcasting antenna according to the present invention. The horizontal phase difference detector 5, vertical phase difference detector 6, and phase difference processor 7 convert the phase difference Δφ based on the direction of the main antenna into position data on the horizontal-vertical coordinate plane, and the position data is converted. Is converted into a bright spot of the display signal and is supplied to the display unit 8. For example, when a bright spot exists at a position on the coordinate plane A of the display screen and the bright spot indicates the current direction of the main antenna (the direction of which is the same as that of the sub antenna), the direction of the main antenna is set downward. Then, the direction of the main antenna is adjusted so that the bright point is located at the center O on the coordinate plane by moving the main antenna by a required amount in the right direction.

FIG. 4 shows an installation example of the main antenna and the sub antenna of the direction display device of the satellite broadcasting antenna according to the present invention. Square main antenna 40 composed of a planar antenna
The rectangular sub-antenna 41 formed of a planar antenna is provided at the four corners of the above, and the directional directions of the main antenna 40 and the sub-antenna 41 are matched. In addition, for example, a quadrilateral sub-antenna, which is a planar antenna, may be installed on the peripheral portion of the main antenna which is a parabola. Further, the shape of the plane antenna is not limited to the quadrangle. Further, the phase difference in the horizontal direction and the phase difference in the vertical direction are independently processed, and the horizontal shift and the vertical shift of the antenna based on the horizontal phase difference and the vertical phase difference are separately calculated, for example, It may be displayed by an LED array or the like. Also,
A sub-antenna may be installed on each of the cross-shaped arms fixed on the back surface of the main antenna by pointing horizontally and vertically to the direction of the main antenna.

[0010]

As described above, according to the present invention, the correct direction of the satellite is the center of the coordinates, and the vertical and horizontal directions are
By displaying the deviation from the correct direction as coordinates on the vertical axis and the horizontal axis, respectively, the current orientation of the antenna is represented by bright points on the coordinate plane, and a satellite broadcasting antenna that realizes an antenna direction display that is visually easy to understand is displayed. A directional display device is provided. Therefore, only by adjusting the direction of the antenna so that the position of the bright spot on the coordinate is aligned with the center of the coordinate, the accurate pointing direction of the satellite broadcasting antenna can be set easily and quickly.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a direction display device of a satellite broadcasting antenna according to the present invention.

FIG. 2 is a diagram showing a relationship between a received radio wave and a phase difference of the direction display device of the satellite broadcasting antenna according to the present invention.

FIG. 3 is an example of a display screen of a direction display device for a satellite broadcasting antenna according to the present invention.

FIG. 4 is an installation example of a main antenna and a sub antenna of the direction display device of the satellite broadcasting antenna according to the present invention.

[Explanation of symbols]

 1 Right Side Sub (Sub) Antenna 2 Left Side Sub (Sub) Antenna 3 Upper Side (Sub) Antenna 4 Lower Side (Sub) Antenna 5 Horizontal Phase Difference Detector 6 Vertical Phase Difference Detector 7 Phase Difference Processor 8 Display Part 20 Main antenna (parabola) 21 Sub antenna (parabola) 22 Reference line 40 Main antenna (planar) 41 Sub antenna (planar)

Claims (6)

[Claims] 1. A sub-antenna having at least two in the horizontal direction and two in the vertical direction, the directivity of which coincides with that of the main antenna, a horizontal direction phase difference detection unit for detecting a phase difference between radio waves in the horizontal direction, and a vertical direction. Directional phase difference detection unit that detects the phase difference of the radio wave in the direction, horizontal phase difference processing unit that converts the direction of the antenna to the corresponding horizontal data based on the horizontal phase difference, and the direction of the antenna based on the vertical phase difference And a vertical phase difference processing unit for converting the horizontal data and the vertical data into a horizontal display signal and a vertical display signal, respectively, and a display and a vertical position based on the horizontal phase difference. A directional display device for a satellite broadcasting antenna, comprising: a display unit that performs display based on a phase difference. 2. A sub-antenna having at least two in the horizontal direction and two in the vertical direction, the directivity of which coincides with that of the main antenna, a horizontal direction phase difference detection unit for detecting a phase difference between radio waves in the horizontal direction, and a vertical direction. A vertical phase difference detection unit for detecting the phase difference of radio waves in the direction, and a phase difference processing unit for converting the direction of the antenna based on the horizontal phase difference and the vertical phase difference into position data on the horizontal-vertical coordinate plane, A display unit for converting the position data into a display signal and displaying the position data as a bright spot on a coordinate plane. 3. The directional display device of a satellite broadcasting antenna according to claim 1, wherein the main antenna and the sub antenna are integrally formed by a plane antenna. 4. The direction display device for a satellite broadcasting antenna according to claim 1, wherein the main antenna and the sub antenna are composed of separate antennas, and are fixed by a required connecting tool. 5. The direction display device of a satellite broadcasting antenna according to claim 3, wherein the sub antenna is provided in a peripheral portion of the main antenna. 6. The directional display device of a satellite broadcasting antenna according to claim 3, wherein the main antenna is composed of a parabola, and a sub-antenna is provided on a peripheral portion of the parabola.