JPH0846530A - Satellite antenna system - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of the direction of the antenna of a satellite communication ground station at a small installation cost by generating an audible tone whose intermittent duty ratio changes depending on the intensity of a received signal from an electroacoustic transducer and adjusting the direction of the antenna while listening to the tone by the ears of the adjustment personnel. CONSTITUTION:Part of an IF signal of an output of a reception frequency conversion section 13 is branched by a coupler 21 and detected by a detection circuit 22 and converted into a DC voltage depending on a TOTAL level of a received band. Furthermore, an A/D converter 23 A/D-converts the voltage and a pulse generator 24 generates a pulse signal whose duty ratio is changed depending on the A/D-converted voltage. On the other hand, an output of a crystal oscillator 31 is frequency-divided by a frequency divider 25 and generated as an audible frequency signal. The pulse signal, the audible frequency signal and an ON/OFF switch signal from a switch means 26 is given to a gate circuit 27 and an output of the circuit 27 drives a PMOSFET switch 29 to turn on/off the power supply supplied to an electroacoustic transducer 30, from which an audible tone having a prescribed audible frequency intermitted depending on the reception level is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a simple device for adjusting the radio wave directing direction of a satellite antenna.
INDUSTRIAL APPLICABILITY The present invention is widely used for satellite communications, satellite broadcasting reception, and other antennas provided with a device for mechanically or electrically adjusting the direction of the radio wave of the antenna so that the antenna sensitivity is maximized for relay satellites can do. The present invention provides an apparatus for easily and optimally adjusting the pointing direction of an antenna while allowing a person who adjusts an acoustic signal that changes according to a signal level received by the satellite antenna to listen to his / her own ear. To use.

[0002]

2. Description of the Related Art A satellite communication device is usually installed in the immediate vicinity of an antenna and is composed of a frequency conversion circuit, an interface circuit between an outdoor device for signal amplification and a terminal, a communication control circuit, and an indoor device equipped with a modulator / demodulator. The received IF signal sent from the outdoor equipment to the indoor equipment is monitored with a spectrum analyzer and adjusted to maximize the received electric field. Also, when demodulating the received signal with the indoor equipment, the AGC voltage proportional to the received electric field strength. Was detected and sent back to the outdoor equipment, and a meter for direction adjustment was connected to adjust while watching the meter.

As a description similar to the present invention, Japanese Patent Laid-Open No.
There is a system disclosed in Japanese Patent Publication No. 9-104837,
This is converted into a voice signal according to the input electric field level of the receiving device, FM-modulated by the signal and sent to the transmitting device side,
The transmitter adjusts the direction of the transmitter by demodulating it and converting it into intermittent audible sound. In addition, JP-A-60-214
Telemetering the FPU (field pickup) received electric field strength as disclosed in Japanese Patent No. 649,
There is a device that changes the loudness of an audible sound in a remote studio according to the telemetered DC voltage and monitors it. Further, as disclosed in Japanese Utility Model Laid-Open No. 61-7149, there is an antenna direction adjusting transceiver for adjusting the direction while listening to a level meter or audible sound with a handset.

[0004]

However, such a conventional method has a problem that the direction cannot be adjusted without a special measuring instrument such as a spectrum analyzer or a meter or a jig. Further, the method disclosed in Japanese Patent Laid-Open No. 59-104837 requires V / F conversion, which complicates the circuit, and the method disclosed in Japanese Patent Laid-Open No. 60-214649 allows the location of the antenna to be changed. There is a problem that it is not possible to adjust the direction while listening to the sound by itself because the place of producing the sound is distant, and the one disclosed in Japanese Utility Model Laid-Open No. 61-7149 is a transmitter / receiver exclusively for the direction adjustment. There is a problem that the transmitter and receiver to be actually used must be replaced later. Further, the methods disclosed in JP-A-59-104837 and JP-A-60-214649 have a problem that the sound is continuously produced even in actual use.

The present invention solves such a problem, and a satellite capable of easily adjusting the direction of an antenna of a ground station for satellite communication without using a special measuring instrument or jig and with a small equipment cost. An object is to provide an antenna device.

[0006]

DISCLOSURE OF THE INVENTION The present invention makes it possible to easily adjust the pointing direction of an acoustic signal, which changes according to the signal level received by a satellite antenna, while listening to the ear. In a satellite antenna device having means for adjusting the pointing direction of the antenna by operating the coupler (2)
1) and a detecting means (22, 23, 24) for obtaining a pulse signal whose period is lower than the audible frequency and whose duty ratio changes from the output of this coupler according to the received signal strength.
And a reception signal level detecting device (50) including a gate circuit (27) for intermittently switching an audible frequency according to the pulse signal, and an electroacoustic transducer (30) to which an output of the gate circuit is connected. It is characterized in that it is provided at a position where the means for adjusting the directivity direction is operated.

The received signal level detecting device (50) is fixedly attached to the back surface of the antenna, and a part or all of the unit is constructed as a detachable unit, and the detecting means outputs the received signal from the output of the coupler. The received signal level detecting device is provided with a detection circuit (22) for obtaining a DC signal whose level changes according to the intensity and a digital logic circuit (23, 24) whose duty ratio changes according to the level of the DC signal. (50) can be provided with a switch means (26) for stopping its operation by operation, or can be used only for reception.

A circuit (16) for interlocking with the switch means (26) to stop the operation of the transmission circuit connected to the antenna during the operation of the received signal level detecting device.
Further, the reception signal level detection device (50) can be provided with a circuit (33, 34) for relaying a signal supplied to the electroacoustic transducer (30) by a weak radio wave.

[0009]

According to the present invention, an audible sound whose intermittent duty ratio changes according to the intensity of the received signal is generated from the electroacoustic transducer, and the person who adjusts the pointing direction of the antenna adjusts it while listening with his or her own ear. To do. The adjuster can focus his or her attention on the operation or mechanical work, without having to look at the meter or other display.

It is convenient to set the pointing direction to be optimum when the intermittent duty ratio of the audible sound is 100%, that is, when the intermittent sound becomes a continuous sound. For example, a sound that is intermittent for a period of a fraction of a second to a few seconds and whose intermittent duty ratio changes can be easily discerned by the human ear.

It is also possible to set the optimum pointing direction when the intermittent duty ratio is 50% or when it becomes the smallest.

The received signal level detecting apparatus of the present invention has an extremely simple structure and is inexpensive, and can be applied to any type of satellite antenna apparatus.

Even if the received signal level detecting device is fixedly attached to the antenna, there is no economical problem.

By making it detachable, it becomes more economical.

Since no audible sound is needed except during adjustment, it is convenient to be able to stop it by operation.

When the satellite antenna device is used for both transmission and reception, when the reception signal level detecting device is operated, the operation of the device on the transmitting side is stopped so that emitted radio waves are not radiated in an inadvertent direction. Is good.

By relaying the signal supplied to the electro-acoustic transducer by a weak radio wave, when the operation end for adjusting the pointing direction of the antenna is distant, for example, the antenna is on the roof and the operation end is indoors. It is convenient in such cases.

[0018]

Embodiments of the present invention will now be described with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention.

The first embodiment of the present invention is provided with a means for adjusting the directional direction of the antenna by operating the mounting base, a coupler 21 for branching the reception output of the antenna 1, and a signal having a cycle lower than the audible frequency. Detection means for obtaining a pulse signal whose duty ratio changes from the output of the lever coupler 21 according to the received signal strength, a gate circuit 27 for interrupting the audible frequency according to this pulse signal, and this gate circuit 2
A reception signal level detecting device 50 including an electroacoustic transducer 30 to which the output of FIG. 7 is connected is provided at a position for operating the means for adjusting the pointing direction, and the reception signal level detecting device 50 is provided on the rear surface of the antenna 1. The reception signal level detecting device 50 is fixedly attached to the above, and a part or all of the reception signal level detecting device 50 is configured as a detachable unit.

The detection means comprises a detection circuit 22 for obtaining a DC signal whose level changes according to the received signal strength from the output of the coupler 21, and a digital logic circuit whose duty ratio changes according to the level of this DC signal. The A / D converter 23 and the pulse generator 24 are provided, and the reception signal level detection device 50 is provided with a switch means 26 for stopping its operation by an operation.

This device can be used for both transmission and reception or for reception only. When used for both transmission and reception, when the reception signal level detection device 50 is operated, the operation of the device on the transmission side is stopped so that emitted radio waves are not emitted in an inadvertent direction.

Next, the operation of the first embodiment of the present invention thus constructed will be described. The signal received by the antenna 1 passes through the orthogonal demultiplexer 11 and the reception frequency conversion unit 13
Is converted into an IF signal and amplified by the duplexer 15, combined with the transmission IF signal, the control signal, and the direct current by the duplexer 15 and transmitted to the indoor equipment. IF of output of reception frequency converter 13
A part of the signal is branched by the coupler 21, detected by the detection circuit 22, and converted into a DC voltage corresponding to the TOTAL level of the reception band. Further, the pulse signal is A / D converted by the A / D converter 23 and A / D converted by the pulse generator 24 to generate a pulse signal whose duty ratio is changed according to the digital value.

On the other hand, the output of the crystal oscillator 31 for the CPU 17 is frequency-divided by the frequency divider 25 to generate an audio frequency signal. The pulse signal, the audio frequency signal, and the ON / OFF signal from the switch means 26 are used as the gate circuit 27.
Input to the Pch MO.
The S FET (field effect transistor) switch 29 is driven to supply power to the electroacoustic transducer 30 (+ V
cc) is turned on / off to generate an audible sound in which a certain audible frequency is intermittent according to the reception level.

The direction of the antenna 1 can be adjusted while listening to this audible sound. When the direction adjustment is completed and the normal operation is returned to, ON / OF from the switch means 26 is performed.
By turning off the F signal, noise can be eliminated and power consumption can be reduced. This ON / OFF
The signal is sent from the outdoor device through the cable by the indoor device, processed by the CPU 17, and ON / OFF controlled.

FIG. 2 shows a frequency divider according to the first embodiment of the present invention.
The output waveforms of the pulse generator and the gate circuit and the presence or absence of electroacoustic are shown. When the ON signal is input to the gate circuit 27, the electroacoustic is generated, and when the signal is turned off, the electroacoustic is stopped.

(Second Embodiment) FIG. 3 is a diagram showing a configuration of a portion of the second embodiment of the present invention different from the first embodiment. In the second embodiment, the electroacoustic transducer 30 in the first embodiment is externally attached as an option, and there is an advantage that the cost of the device body can be reduced accordingly.

(Third Embodiment) FIG. 4 is a diagram showing a structure of a portion different from the first embodiment of the third embodiment of the present invention. In the third embodiment, in addition to the configuration of the reception signal level detection device 50 in the first embodiment, a frequency divider 32 that relays a signal supplied to the electroacoustic transducer 30 by a weak current, an AND circuit 3 are provided.
5, a driver 33 and a medium-wave antenna 34 are provided,
Others are the same as in the first embodiment.

In the case of the third embodiment, the output of the crystal oscillator 31 is divided by the frequency divider 32 to generate a signal in the frequency band of AM medium wave broadcasting, and the signal output from the AND circuit 35 is AM-modulated. Then, an AM medium wave signal is generated by the driver 33 and transmitted from the medium wave antenna 34 to the general AM radio by the driver 33, and an intermittent signal of audible sound demodulated by the AM radio can be obtained.

(Fourth Embodiment) FIG. 5 is a diagram showing a structure of a portion different from the first embodiment of the fourth embodiment of the present invention. In the fourth embodiment, in addition to the configuration of the first embodiment, the switch means 2
A switch circuit 16 for interlocking with 6 to stop the operation of the transmission unit 12 connected to the antenna 1 is provided during the operation of the reception signal level detection device 50. In the case of the fourth embodiment, it is possible to shut off the power supply on the transmitting side during the direction adjustment of the antenna 1 and thus prevent erroneous transmission during the direction adjustment. There are advantages.

[0031]

As described above, according to the present invention, it is possible to easily adjust the direction of the antenna device to which the transceiver is attached by listening to the change due to the intermittent audible sound without using a special measuring instrument or jig. In addition, since it is possible to make no sound except when adjusting the direction, it is possible to reduce noise and power consumption.
Since the transmitting side can be cut off at the time of adjusting the direction, there is an effect that it is possible to prevent interference with other satellites by mistake.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing waveforms according to the first embodiment of the present invention.

FIG. 3 is a partial view showing the configuration of a second embodiment of the present invention.

FIG. 4 is a partial view showing the configuration of a third embodiment of the present invention.

FIG. 5 is a partial view showing the configuration of a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 antenna 10 microwave transmitter / receiver 11 orthogonal polarization demultiplexer 12 transmitter 13 reception frequency converter 14 transmission controller 15 duplexer 16 switch circuit 17 CPU 21 coupler 22 detector circuit 23 A / D converter 24 pulse generator 25, 32 Frequency divider 26 Switch means 27 Gate circuit 28 NOT circuit 29 Pch MOS FET switch 30 Electroacoustic transducer 31 Crystal oscillator 33 Driver 34 Medium wave antenna 35 AND circuit

Claims (9)

[Claims] 1. A satellite antenna device comprising means for adjusting a directivity direction of an antenna by operating a mounting base, wherein a coupler for branching a reception output of the antenna and a signal having a cycle lower than an audible frequency are provided. Detection means for obtaining a pulse signal whose duty ratio changes according to the received signal strength from the output of the coupler, a gate circuit for connecting and disconnecting the audible frequency according to this pulse signal, and an electroacoustic conversion to which the output of this gate circuit is connected. A satellite antenna device, wherein a reception signal level detecting device including a receiver is provided at a position for operating the means for adjusting the pointing direction. 2. The satellite antenna apparatus according to claim 1, wherein the received signal level detecting apparatus is fixedly attached to the back surface of the antenna. 3. The satellite antenna device according to claim 1, wherein a part or all of the reception signal level detection device is configured as a detachable unit. 4. The detection means includes a detection circuit that obtains a DC signal whose level changes from the output of the coupler according to the received signal strength, and a digital logic circuit whose duty ratio changes according to the level of the DC signal. The satellite antenna device according to claim 1, further comprising: 5. The satellite antenna apparatus according to claim 1, wherein the received signal level detection device includes a switch means for stopping its operation by an operation. 6. The satellite antenna device according to claim 5, wherein the satellite antenna device is used for both transmission and reception. 7. The satellite antenna device according to claim 6, further comprising a circuit which is interlocked with said switch means to stop the operation of a transmission circuit connected to said antenna during operation of said received signal level detecting device. 8. The antenna device according to claim 1, wherein the satellite antenna device is a reception-only antenna device. 9. The satellite antenna apparatus according to claim 1, wherein the received signal level detecting apparatus is provided with a circuit that relays a signal supplied to the electroacoustic transducer by a weak radio wave.