JP2000278160A - Phase adjustment device and antenna controller using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a phase difference signal whose level is constant even after adjustment and to facilitate phase adjustment. SOLUTION: A rotary switch 205 sets a quadrant, and an output of a ROM 201, or an output of an inverting circuit 203, or an output of a ROM 202 or an output of an inverting circuit 204 is selectively outputted depending on the set quadrant. Then a variable resistor 206a of a synthesis circuit 206 is used to synthesize the introduced SIN and COS signals while setting the level of each signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the direction of an antenna based on, for example, a phase difference between a signal of a main polarization received by an antenna and a signal of a cross polarization orthogonal to the main polarization. The present invention relates to a phase adjustment device applied to an antenna control device and an antenna control device using this device.

[0002]

2. Description of the Related Art Conventionally, for example, an antenna control apparatus for controlling the direction of an antenna based on the phase difference between a signal of a main polarization received by an antenna and a signal of a cross polarization orthogonal to the main polarization. Uses a phase adjusting device as shown in FIG.

[0003] The phase adjusting device shown in FIG.
Only Memory) 40, 41, inverting circuits 42, 43,
A synthesizing circuit 44. The ROM 40 stores a SIN signal (sine wave signal), and reads out and outputs the SIN signal based on a 10 kHz clock signal. The ROM 41 stores a COS signal (cosine wave signal) having a 90 ° phase shift from the SIN signal, and reads and outputs the COS signal based on a 10 kHz clock signal. The SIN signal read from the ROM 40 is obtained by the inverting circuit 42 to obtain a minus component -SIN signal, and the COS signal read from the ROM 41 is obtained by the inverting circuit 43 to obtain the minus component -COS signal. Then, the ± SIN signal and the ± COS signal are output to the combining circuit 44.
The amplitude level is adjusted by the volume 441, and a desired phase difference signal is generated by obtaining a required combination ratio of the SIN signal and the COS signal. This phase difference signal is used for controlling the direction of the antenna in the antenna control device.

However, in the above-described phase adjustment device, two volumes must be adjusted in order to obtain a phase difference signal, and it is difficult to understand the relationship between the rotational position and the phase of the volume. It takes time and effort. Further, since the phase difference is determined by the combined ratio of the amplitude levels of the COS signal and the SIN signal, as shown in FIG. 10, even if the same phase angle (in FIG. If the amplitude level is A in FIG. 10, the amplitude is too small, and there is a possibility that a subsequent circuit that requires a phase difference signal does not function sufficiently.

[0005]

As described above, in the above-described phase adjusting device, two volumes must be adjusted in order to obtain a phase difference signal, and the relationship between the rotational position and the phase of the volume has to be adjusted. Since it is indefinite, there is a disadvantage that it takes a lot of time and effort for adjustment. further,
Since the phase difference is determined by the combined ratio of the amplitude levels of the COS signal and the SIN signal, the magnitude of the amplitude level is indeterminate. If the amplitude level is too small, the subsequent circuit that requires the phase difference signal does not function sufficiently. There is a problem that there is fear.

SUMMARY OF THE INVENTION An object of the present invention is to provide a phase adjusting apparatus which facilitates the phase adjustment and can obtain a phase difference signal having a constant amplitude level even after the adjustment. Another object of the present invention is to provide an antenna control device capable of realizing highly accurate antenna direction control with a simple operation using a phase difference signal of a phase adjustment device.

[0007]

A phase adjusting device according to the present invention extracts a phase difference between a first signal and a second signal and controls the phase difference to a predetermined value. A sine wave signal generating means for generating a sine wave signal, a cosine wave signal generating means for generating a cosine wave signal having a 90 ° phase shift with respect to the sine wave signal, and a sine wave generating means. First inverting means for inverting the sign of the sine wave signal, second inverting means for inverting the sign of the cosine wave signal generated by the cosine wave generating means, and sine wave signal generation in response to an external operation Phase difference signal generation means for generating a correction phase difference signal for each of a plurality of different quadrants from the output of the means, the output of the cosine wave signal generation means, the output of the first inversion means, and the output of the second inversion means; And a phase difference between the first signal and the second signal. And the correction phase difference signal generated by the phase difference signal generation means, and the phase difference is controlled to a predetermined value by operating the phase difference signal generation means based on the multiplication result. It is characterized by the following.

The phase difference signal generating means outputs the output of the sine wave signal generating means or the output of the first inverting means, the output of the cosine wave signal generating means or the output of the second inverting means according to the quadrant. Output switching means for selectively deriving the phase difference signal for correction, and synthesizing the signal of the sine wave component and the signal of the cosine wave component output from the output switching means in accordance with an external operation, thereby forming the correction phase difference signal. And a synthesizing means for generating.

According to this configuration, first, a quadrant is set in the output switching means, and the output of the sine wave signal generating means or the output of the first inverting means is set according to the set quadrant.
The output of the cosine wave signal generating means or the output of the second inverting means is selectively derived, and within the set quadrant, the derived sine wave component signal and cosine wave component signal are each divided by one volume. The signal amplitude is set and the signals are combined. That is, since the relationship between the sine wave signal and the cosine wave signal is predetermined in the set quadrant, a change in the resistance value of one volume corresponds to a change in the phase angle in the set quadrant.

Therefore, since the phase can be estimated at the position of one volume, the phase can be easily adjusted, and a correction phase difference signal having a constant amplitude level after the adjustment can be obtained.

Further, if the phase adjustment device having the above configuration is applied to an antenna control device, highly accurate antenna direction control can be realized so that the antenna can be directed to a direction in which the antenna can be satisfactorily received with a simple operation.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit block diagram showing an embodiment of an antenna control device using a phase adjustment device according to the present invention. In FIG. 1, reference numeral 11 denotes an antenna, which receives a signal that becomes a main polarization from a radio wave arriving from a satellite and a signal that becomes a cross polarization orthogonal to the main polarization. The signal received by the antenna 11 has a main polarization component of LNB (Low Noise) at the polarization switch 12.
(Block Down Converter) 13, and the cross polarization component is derived to the LNB 14. The LNBs 13 and 14 respectively perform low noise elimination on the input signals, and then output the signals to the corresponding frequency converters 15 and 16.

The frequency converters 15 and 16 convert the input signals into intermediate frequency signals by multiplying the input signals by a local oscillation signal generated from a local oscillator 17, and then output the signals to a synthesizer 18. The synthesizer 18 synthesizes the output of the frequency converter 15 and the output of the frequency converter 16 to obtain
A phase difference signal is generated and output to the antenna direction controller 19.

As will be described in detail later, the antenna direction controller 19 corrects the correction output from the phase adjustment circuit 20 so that the phase difference between the main polarization component signal and the cross polarization component signal becomes a predetermined value. The direction of the antenna 11 is controlled using the phase difference signal for use. In other words, the direction of the antenna 11 is controlled so that the radio wave from the satellite can be favorably received.

The phase adjustment circuit 20 constitutes a phase adjustment device according to the present invention, and operates based on a clock signal generated from a clock generator 21.

Next, a specific configuration of the phase adjustment circuit 20 will be described with reference to FIG. That is, the phase adjustment circuit 20 includes the ROMs 201 and 202 and the inversion circuit 20.
3, 204, the rotary switch 205, and the combining circuit 2
06. The ROM 201 stores the SIN signal, and reads and outputs the SIN signal based on a clock signal generated from the clock generator 21. RO
M202 has a C phase shifted by 90 ° compared to the SIN signal.
It stores an OS signal, and reads and outputs a COS signal based on a clock signal generated from the clock generator 21.

The SIN read from the ROM 201
On the other hand, the signal has its sign inverted by the inverting circuit 203-
SIN signal is supplied to the rotary switch 205,
On the other hand, the rotary switch 205 is directly used as the + SIN signal.
Supplied to Similarly, the COS signal read from the ROM 202 is inverted on the one hand by the inversion circuit 204 and supplied to the rotary switch 205 as a -COS signal, and is directly supplied to the rotary switch 2 as a + COS signal.
05.

The rotary switch 205 is connected to the + SIN signal output from the ROM 201 or the −SIN signal output from the inversion circuit 203 and the ROM 20 according to the quadrant.
2 and selectively outputs the + COS signal which is the output of the second circuit or the −COS signal which is the output of the inversion circuit 204. The SIN signal and CO derived by the rotary switch 205
The S signal is synthesized by the synthesizing circuit 206 that can arbitrarily set the amplitude level of the input signal by adjusting the volume 206 a, thereby generating a correction phase difference signal and outputting the signal to the antenna direction controller 19.

The operation of the phase adjustment circuit 20 will be described below with reference to FIGS. That is, in order to generate a phase difference signal having a constant amplitude level, the SIN signal and the COS signal are given a relationship as shown in FIG. FIG. 4 is a circuit characteristic diagram similar to FIG. The rotary switch 205 is a phase quadrant switch, where the first quadrant is 0 ° to 90 °, the second quadrant is 90 ° to 180 °, and the third quadrant is 90 ° to 180 °.
Quadrant 180 ° -270 °, 4th quadrant 270 ° -36
It corresponds to 0 °. The volume 206a adjusts the phase angle within the set quadrant.

In the first quadrant, referring to the phase difference signal generation table shown in FIG.
6a has a + SIN signal at one input terminal and a + SIN signal at the other input terminal.
A COS signal is applied, and the resistance value of the volume 206a is set as shown in FIG.
By rotating and adjusting so as to change in the middle CW direction, a SIN signal having a phase difference of 0 ° to 90 ° is obtained. In the second quadrant, the + SIN signal is applied to one input terminal of the volume 206a of the synthesis circuit 206, and the -COS signal is applied to the other input terminal, and the resistance of the volume 206a is rotated so as to change in the CCW direction in FIG. SIN with a phase difference of 90 ° to 180 ° by adjusting
Get the signal. At this time, the volume 206a can be continuously adjusted because the rotation direction opposite to the first quadrant is the direction in which the phase difference increases. In the third and fourth quadrants as well, the rotary switch 205 is switched so that
Can be adjusted continuously.

That is, the phase difference signal adjusted by the phase adjustment circuit 205 is combined with the SIN signal and the COS signal whose amplitude has been adjusted by the volume 206a of the combining circuit 206 within the quadrant set by the rotary switch 205. Changes according to the transition shown in FIG.

As described above, according to the above configuration, first,
The quadrant is set by the rotary switch 205, and the output of the ROM 201 or the inversion circuit 20 is set according to the set quadrant.
3 and the output of the ROM 202 or the inverting circuit 20
4 is selectively derived, and within the setting quadrant, the derived SIN signal and COS signal are
The amplitude level of each signal is set by one volume 206a and the signals are combined. That is, within the setting quadrant,
Since the relationship between the SIN signal and the COS signal is predetermined, a change in the resistance value of one volume 206a corresponds to a change in the phase angle in the set quadrant.

For this reason, since the phase can be estimated based on the rotational position of the volume 206a, the phase can be easily adjusted, and a correction phase difference signal having a constant amplitude level after the adjustment can be obtained.

The adjusted phase difference signal for correction is
Output to the antenna direction controller 19, the antenna 11
Is provided for the direction control process. Therefore, control processing of the antenna direction controller 19 will be described with reference to FIG.
That is, in the antenna control device, FIGS.
As shown in the figure, the antenna 11 is directly opposed to the satellite by utilizing the phenomenon that the cross polarization directivity pattern changes the phase from 90 ° to −90 ° at the center of the main polarization directivity of the antenna 11 as a boundary. .

First, in order to determine the direction of the antenna 11, a null point which is the maximum amplitude point of the main polarization signal and a null point which is the minimum amplitude point of the cross polarization signal are detected. Then, the shift direction and the shift amount of the null point of the cross-polarized signal with respect to the null point of the main polarized signal are set as the control voltage shown in FIG.

The antenna direction controller 19 has a control voltage of +
By looking at the direction, it is possible to detect in which direction the directional angle of the antenna 11 is shifted.
Here, when there is a shift, the main polarization is multiplied by multiplying the correction phase difference signal output from the phase adjustment circuit 20 by the phase difference signal output from the combiner 18 and monitoring the multiplication result. The observer operates the rotary switch 205 and the volume 206a of the combining circuit 206 so that the null point of the signal of the second signal coincides with the null point of the signal of the cross polarization.

In this manner, the antenna 1 can be easily operated so that the radio wave from the satellite can be received well.
1 can be controlled with high accuracy.

In the above-described configuration, the observer operates the rotary switch 205 and the volume 206 a of the synthesizing circuit 206.
Has been described, but the present invention can also be implemented by automatically controlling based on the phase difference between the main polarization signal and the cross polarization signal.

Therefore, FIG.
3 shows an example of control means for the synthesizing circuit 206. Here, a system controller 300 is provided, and an output from the antenna direction controller 19 is supplied to the system controller 300. Based on the output from the antenna direction controller 19, the system control unit 300 can obtain a correction phase difference signal that matches the null point of the main polarization signal with the null point of the cross polarization signal. Next, the switching process of the rotary switch 205 and the resistance value of the volume 206a are controlled. Here, the system control unit 300 needs to know which quadrant is to be set and what amplitude level the volume should be adjusted. This is based on the null of the cross-polarized signal from the output of the antenna direction controller 19. The point can be grasped by judging the shift direction and the shift amount with respect to the null point of the signal of the main polarization. This is the system controller 3
00 can be realized by a microcomputer program.

By providing such control means,
Based on the direction and amount of shift of the null point of the cross-polarized signal from the null point of the main polarized signal, the rotary switch 2
05 and volume adjustment of the synthesis circuit 206 can be automatically performed.

In the above embodiment, the phase adjustment circuit 2
Although the example in which 0 is applied to the antenna control apparatus has been described, it is also possible to extract the phase difference between the two signals and apply the phase adjustment circuit 20 to an apparatus that controls the phase difference to a predetermined value. It is possible.

In addition, the configuration of the phase adjustment circuit, the configuration of the antenna control device, the method of generating the phase difference signal for correction, and the like can be variously modified without departing from the gist of the present invention.

[0033]

As described in detail above, according to the present invention,
It is possible to provide a phase adjustment device that facilitates phase adjustment and can obtain a phase difference signal having a constant amplitude level even after the adjustment. Further, it is possible to provide an antenna control device capable of realizing high-precision antenna direction control with a simple operation using the phase difference signal of the phase adjustment device.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing an embodiment of an antenna control device to which a phase adjustment device according to the present invention is applied.

FIG. 2 is a circuit block diagram showing a specific configuration of the phase adjustment circuit shown in FIG. 1;

FIG. 3 is a characteristic diagram showing a relationship between a SIN signal and a COS signal.

FIG. 4 is a circuit characteristic diagram similar to FIG. 3;

FIG. 5 is a diagram showing a phase difference signal generation table used for volume adjustment of the synthesis circuit shown in FIG. 2;

FIG. 6 is a diagram showing a transition of a change in a phase difference signal due to volume adjustment of the synthesis circuit shown in FIG. 2;

FIG. 7 is a characteristic diagram showing details of detection of a phase difference between a main polarization signal and a cross polarization signal in the antenna direction controller shown in FIG. 1;

FIG. 8 is a circuit block diagram showing an example of control means for the rotary switch and the synthesizing circuit shown in FIG. 2;

FIG. 9 is a circuit block diagram showing a configuration of a conventional phase adjustment device.

FIG. 10 is a diagram showing a problem in a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Antenna, 12 ... Polarization switch, 13, 14 ... LNB, 15, 16 ... Frequency converter, 17 ... Local oscillator, 18 ... Synthesizer, 19 ... Antenna direction controller, 20 ... Phase adjustment circuit, 21 ... Clock generators, 40, 41, 201, 202: ROM, 42, 43, 203, 204: inverting circuit, 205: rotary switch, 44, 206: synthesizing circuit, 206a, 441: volume, 300: system control unit.

Claims (4)

[Claims] 1. A phase adjusting device applied to a device for extracting a phase difference between a first signal and a second signal and controlling the phase difference to a predetermined value, wherein the sine wave signal generates a sine wave signal. Generating means; cosine wave signal generating means for generating a cosine wave signal having a 90 ° phase shift with respect to the sine wave signal; and first inversion for inverting the sign of the sine wave signal generated by the sine wave generating means. Means, a second inverting means for inverting the sign of the cosine wave signal generated by the cosine wave generating means, an output of the sine wave signal generating means in response to an operation from outside, and the cosine wave signal generating means , An output of the first inverting means, and a phase difference signal generating means for generating a correction phase difference signal for each of a plurality of different quadrants from the output of the second inverting means. And the phase difference signal between the second signal and the second signal Multiplying the signal by the correction phase difference signal generated by the signal generation means, and operating the phase difference signal generation means based on the multiplication result, thereby controlling the phase difference to a predetermined value. Phase adjustment device. 2. The method according to claim 1, wherein said phase difference signal generating means includes an output of said sine wave signal generating means or an output of said first inverting means, an output of said cosine wave signal generating means or said second signal. An output switching means for selectively deriving an output of the inverting means; and a signal of a sine wave component and a signal of a cosine wave component output from the output switching means, which are synthesized in accordance with an operation from the outside. 2. A synthesizing means for generating a correction phase difference signal.
The phase adjustment device according to any one of the preceding claims. 3. The output switching unit according to claim 2, further comprising: a synthesizing unit that obtains a correction phase difference signal that sets the phase difference to a predetermined value based on a phase difference between the first signal and the second signal. 3. The phase adjusting device according to claim 1, further comprising a phase difference generation control unit that controls the combining unit. 4. An antenna control device using the phase adjustment device according to claim 1, wherein a signal of the first polarization and a second polarization orthogonal to the first polarization. An antenna for receiving a wave signal; a phase difference detecting means for detecting a phase difference between a first polarized signal and a second polarized signal received by the antenna; Antenna driving control means for controlling the direction of the antenna using a correction phase difference signal provided from the phase adjustment device so that the phase difference becomes a predetermined value. Control device.