KR19980047726A - Antenna automatic adjustment device of moving object - Google Patents

Abstract

The present invention relates to a device for automatically adjusting an antenna of a moving object, wherein the position of the moving object is detected by a GPS receiver using a GPS (Global Positioning System), and a moving object such as a tilt and a reference azimuth deviation of the moving object is detected to be suitable for satellite broadcasting reception. By automatically adjusting the elevation and azimuth angles of the broadcast receiving antennas, satellite broadcasts can be received while moving, and the satellite receiver receives the adjusted signal of the satellite broadcast receiving feedback from the satellite receiver to fine-tune the satellite broadcast receiving sensitivity. Can improve.

Description

Antenna automatic adjustment device of moving object

The present invention relates to an antenna for receiving satellite broadcasting, and more particularly, to an apparatus for automatically adjusting an antenna of a moving object for receiving satellite broadcasting in a moving object.

Generally, when you want to receive satellite broadcasting, you need to install the satellite broadcasting receiving antenna (hereinafter referred to as antenna) correctly. Because the beam width of the antenna is very small (for example, about 4 degrees), it is difficult to receive satellite broadcasting even if the direction is slightly changed. Becomes difficult. Therefore, as shown in FIG. 1, the direction of the antenna must be accurately adjusted in consideration of the azimuth angle, which is the angle between the north pole and the satellite direction, and the elevation angle, which is the angle between the horizontal line and the satellite direction. In this case, the azimuth and elevation angles vary depending on the longitude of the satellite and the position of the antenna, that is, the latitude and longitude of the antenna.

FIG. 2 is a diagram illustrating an antenna adjusting apparatus according to the prior art, and includes a first comparator 11 which compares and outputs an elevation angle set by calculation according to a position of a satellite and a reception position of a moving object and an aerial angle of the antenna 10. ), The second comparator 12 which compares and outputs the current azimuth angle of the antenna 10 and the azimuth set value set by the calculation, and is driven in accordance with the output of the first comparator 11 to adjust the elevation angle of the antenna 10. A first motor 13 for controlling, a second motor 14 for driving the azimuth of the antenna 10 driven according to the output of the second comparator 12, a current elevation angle of the antenna 10, and The first and second feedback units 15 and 16 output the azimuth angles to the first and second comparators 11 and 12.

Referring to the operation of the antenna adjustment apparatus according to the prior art configured as described above are as follows.

In order to receive satellite broadcasting from a moving object such as a vehicle, first, the vehicle is stopped at the destination and the elevation angle and azimuth angle of the antenna for receiving the satellite broadcasting according to the latitude and longitude of the satellite position and the antenna installation position are set by calculation. . The calculation formula of elevation angle and azimuth angle is shown in Table 1, and examples of azimuth angle and elevation angle for the geostationary orbit satellite floating at 116 ° east long are shown in Table 2.

TABLE 1

Azimuth and elevation angle formulas

t1

TABLE 2

Example of azimuth and elevation

t2

The first motor 13 for controlling the elevation angle is driven based on the set elevation angle and the output angle obtained by comparing the current elevation angle of the antenna through the first feedback unit 15 to the first comparator 11. Accordingly, the elevation angle of the antenna 10 is adjusted. In addition, the second motor 14 is driven to control the azimuth angle by setting the azimuth value and the azimuth angle of the current antenna 10 to the second comparator 12 through the second feedback unit 16 and comparing the output values. Thus, the azimuth angle of the antenna 10 is adjusted.

Antenna adjustment apparatus according to the prior art has a user has to adjust the antenna by calculating the azimuth and elevation angle of the antenna by inputting the longitude of the satellite and the position of the antenna. In addition, since the position of the moving object changes frequently during movement, the position of the antenna cannot be immediately input, so there is a problem in that satellite broadcasting cannot be received during movement.

Accordingly, the present invention has been made to solve the problems of the prior art, the present invention is to receive the position of the moving object using a GPS (Global Positioning System) by the antenna of the mobile to facilitate the reception of satellite broadcasting in the moving object The purpose is to provide an adjusting device.

1 is a view showing a measurement principle of a general elevation angle and azimuth angle,

Figure 2 is a block diagram showing an antenna adjustment apparatus according to the prior art,

3 is a view showing the principle of measuring the elevation angle and azimuth angle of the moving object,

Figure 4 is a block diagram showing a first embodiment of the automatic device for adjusting the antenna of the moving body according to the present invention,

5a to 5b are magnetic north error diagram of North America,

Figure 6 is a block diagram showing a second embodiment of the antenna adjustment apparatus of the moving body according to the present invention,

Figure 7 is a block diagram showing a third embodiment of the antenna adjustment apparatus of the moving body according to the present invention.

* Description of the symbols for the main parts of the drawings *

30: antenna 40: GPS receiver

50: moving state detection unit 51: inclination detection unit

52: reference azimuth deviation detection unit 60: control unit

70: drive unit 80: geomagnetic error detection unit

The automatic antenna adjustment device for a mobile body according to the present invention detects the position of the mobile body using a GPS, and detects the state of the mobile body such as a tilt and a reference azimuth deviation of the mobile body so as to be suitable for satellite broadcast reception. Automatically adjusts the elevation angle and azimuth of the antenna, and also has a feature that can finely adjust the satellite broadcasting reception antenna by detecting the satellite broadcasting signal of the adjusted satellite broadcasting reception antenna.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the automatic antenna adjustment device of the moving object according to the present invention will be described in detail.

3 is a view showing the measurement principle of the elevation angle and azimuth angle of the moving object, Figure 4 is a block diagram showing a first embodiment of the antenna control apparatus of the moving object according to the present invention. 5A is a diagram illustrating a relationship between true north and magnetic north in North America, FIG. 5B is a magnetic north error diagram of North America due to a difference between true north and magnetic north, and FIG. 6 is a second embodiment of an antenna control apparatus for a mobile device according to the present invention. 7 is a block diagram illustrating an example, and FIG. 7 is a block diagram illustrating a third embodiment of an antenna adjusting apparatus for a moving object according to the present invention.

Referring to FIG. 4, the GPS receiver 40 detects the position of the moving object by receiving a signal from the satellite using a GPS (Global Positioning System), and the moving state detection unit 50 detecting the state of the moving object. And a controller 60 for receiving the position and state of the moving object and outputting the elevation and azimuth control signals of the antenna 30 for receiving satellite broadcasting, and a driver for adjusting the antenna 30 by the elevation and azimuth control signals. It consists of 70. Here, the moving object state detection unit 50 is composed of an inclination detection unit 51 for detecting the inclination of the horizontal plane of the moving object, and a reference azimuth deviation detection unit 52 for detecting the angle difference between the true north direction and the azimuth reference direction of the moving object. . At this time, the geomagnetic error detection unit 80 receives the position information of the GPS receiver 40 when detecting the state of the mobile body by using a compass in the mobile state detection unit 50 detects an error caused by the geomagnetic of the true north and outputs it to the control unit 60. ) Is configured to include.

The apparatus for automatically adjusting the antenna of the moving body according to the present invention configured as described above operates as follows.

In order to receive satellite broadcasting in a moving object such as a vehicle equipped with a satellite broadcasting receiving station or in a stopped state, first, location information regarding latitude and longitude of the GPS receiver 40 using the GPS is calculated. Output Incidentally, the inclination detection unit 51 of the moving body state detection unit 50 is the inclination D, which is the inclination degree of the horizontal plane and the moving body, and the reference azimuth deviation detection unit 52 is a reference azimuth angle which is the angle difference between the azimuth reference direction and the true north direction of the moving body. Deviation (M) is detected and outputs the status information, geomagnetic error detection unit 80 detects the slope (D) and the reference azimuth deviation (M) of the moving object by using a compass in the moving object state detection unit 50 to the geomagnetic 5A and 5B, since magnetic north errors occur that are different from true north and magnetic north, the geomagnetic error information is output to the controller 60 by receiving the output signal of the GPS receiver 40.

The controller 60 receives the position information, the state information and the geomagnetic error information of the detected moving object, calculates a corrected elevation angle and azimuth angle for receiving satellite broadcasting, and outputs a control signal accordingly. Here, the elevation angle and azimuth calculation method of the moving body will be described with reference to FIG. 3. If the moving object is moving on a road with a certain angle of inclination on the horizontal plane, the elevation angle is ∠EL, which is the angle between the horizontal plane (OH) and the moving antenna direction (OT), but the moving object controls the elevation angle according to the degree of inclination of the moving object with respect to the horizontal plane. Since the inclination detector 51 detects the degree of inclination of the moving object with respect to the horizontal plane and corrects the elevation angle, ∠EL 'which is the angle between the elevation angle reference plane OH' and the antenna direction OT of the moving object is corrected. do. In addition, the azimuth is the angle measured with respect to the North Pole, so OA, which is the idea of the horizontal plane of the antenna direction (OT) of the moving object, is ∠AZ, which is the angle between the true north (ON) and the true north (ON) and the moving object reference direction (OR). Since the reference azimuth deviation (M), which is a difference from the (), occurs, the reference azimuth deviation detector (52) detects the reference azimuth deviation (M), and OA, which is the mapping between the azimuth reference direction (OR) and the moving antenna direction (OT) of the moving object. 사 AZ 'is the corrected azimuth angle. At this time, the azimuth reference direction of the moving body is assumed to be the moving direction of the moving body. For example, the method of calculating the elevation angle and azimuth angle of the moving object is as follows.

Suppose that you want to receive satellite broadcasts broadcast from geostationary orbit satellites at 116 degrees east from a moving object moving in the Seoul area. The GPS receiver 40 grasps the latitude and longitude of the moving object and inputs it to the control unit 60. 60 uses this information to calculate the elevation and azimuth angles. The value is azimuth angle 197.7 ° and elevation angle 45 ° referring to Table 2. The calculated elevation and azimuth angles are for horizontal plane and true north, so they cannot be applied as they are. Therefore, it is necessary to grasp and correct the state information of the moving object. In the tilt detection unit 51, the moving object travels down 10 ° in the moving direction, and in the reference azimuth deviation detection unit 52, the reference azimuth deviation M is + 30 ° (+ for east,-for true north). Assume that the West information is provided to the control unit 60. Meanwhile, the geomagnetic error detection unit 80 receives the latitude and longitude information from the GPS receiver 40 and provides the geomagnetic error information + 7 ° of the Seoul area to the controller 60. By inputting the above information, the controller 60 calculates the corrected elevation angle and azimuth angle. Here, the corrected elevation angle is 35 °, which is the elevation angle (45 °) -tilt (10 °) calculated from the moving object position. At this time, even if the inclination is equal to 10 °, the corrected elevation angle should be 55 ° if the reference direction is out of the range -90 ° ≤ M ≤ + 90 °. Also, the corrected azimuth angle is 197.7 °-(+ 30 °) = 167.7 °. However, if the reference azimuth deviation M is due to magnetic field information, geomagnetic error information should be added, so the corrected azimuth angle is 197.7 °-[(+ 30 °)] + 7 ° = 160.7 °.

The driver 70 receives the corrected elevation and azimuth control signals for satellite broadcast reception by the controller 60 and drives the elevation and azimuth adjustment motors (not shown) to adjust the elevation and azimuth angles of the antenna 30.

A second embodiment of the automatic antenna adjustment apparatus for a moving object according to the present invention will be described with reference to FIG. 6 as follows.

The satellite signal receiving unit 90 and the satellite signal receiving unit 90 for precisely adjusting the antenna 30 by receiving the satellite broadcasting signal received through the antenna 30 and outputting the reception state information to the control unit 60. The other configuration is the same as in the first embodiment except for the description thereof.

According to the second embodiment of the present invention configured as described above, when the state of the moving object detected by the moving state detecting unit 50 is inaccurate and the antenna 30 adjusted for receiving the satellite broadcasting is not optimal, the satellite signal receiving unit 90 ) Checks the input level or signal-to-noise ratio of the satellite broadcast signal received by the antenna 30 and provides the reception state information to the control unit 60. The control unit 60 outputs a control signal for fine-adjusting the elevation angle and azimuth angle of the antenna 30 so that the satellite broadcasting reception state is optimal by the reception state information provided, and the elevation angle is driven by the driving unit 70 by the control signal. And fine-adjust the elevation angle and azimuth angle of the antenna 30 by driving the azimuth adjustment motor. At this time, the satellite signal receiving unit 90 is installed on the control unit 60 side.

On the other hand, FIG. 7 unlike the satellite signal receiver 90 of the second embodiment uses the Low Noise Block Down Conver (LNB) unit 100 as a means for determining the reception state of the satellite signal. That is, the elevation angle and azimuth angle of the antenna 30 are finely adjusted by detecting the power level of the input signal in the LNB unit 100 and providing the reception state information to the controller 60.

The automatic antenna adjusting device of the moving object detects the position of the moving object using GPS, and also detects the state of the moving object and automatically adjusts the antenna according to the elevation angle and azimuth angle suitable for receiving the satellite broadcasting, thereby receiving the satellite broadcasting during the movement. It can work. In addition, since the antenna is fine-tuned by detecting the satellite broadcast signal received through the antenna can improve the satellite broadcast reception sensitivity.

Claims (4)

In a mobile unit having an antenna capable of receiving a current position from a satellite, A moving body state detection unit detecting a state of the moving body; A control unit which receives the position and state of the moving object and outputs a correction elevation angle and azimuth control signal of the satellite broadcasting reception antenna; And an actuator for adjusting the satellite broadcasting reception antenna according to a control signal of the controller. The method of claim 1, And the moving object state detecting unit comprises an inclination detecting unit detecting an inclination with a horizontal plane of the moving body, and a reference azimuth deviation detecting unit detecting an angle difference between the azimuth reference direction and the true north direction of the moving body. The method of claim 1, And a geomagnetism error detecting unit configured to receive the position of the moving object and output an error between true north and magnetic north to the controller. The method of claim 1, And a satellite signal receiver for fine-adjusting the satellite broadcast receiver antenna by receiving the broadcast reception signal of the satellite broadcast receiver antenna and outputting the reception state information to the controller.