JPH0287088A - Controlling system of antenna - Google Patents

Abstract

PURPOSE:To enable the continuous control of an antenna by providing a control device for selecting one arbitrary reference carrier wave out of a plurality of reference carrier waves. CONSTITUTION:Reference frequency converter elements 1 to 4 prepare from a local oscillator 5 frequencies being necessary for conversion into reception frequencies of a reference carrier wave transmitter-receiver device 25, preparing non-conversion modulated waves 16 to 19 called pilots, for instance. A switching element 6 is made to input a frequency outputted from the oscillator 5 to any one of the converter elements 1 to 4 under the control of a control element 7. The control element 7 judges the existence of a reference carrier wave to be used for an antenna control, from a signal sent from the device 25, and gives the switching element 6 an instruction as to which of the converter elements 1 to 4 is to be used. When the transmission of a pilot 19 stops while the control element 7 gives an instruction to use the same, for instance, according to this constitution, the control element 7 gives an instruction to receive a pilot 18 subsequently. This shift is repeated likewise thereafter. In this way, any of reference carrier waves transmitted by communication satellites employed at present is found out, and thereby the antenna control is executed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to antenna control of a satellite earth station.

In particular, the present invention relates to an antenna control method suitable for always pointing the antenna toward a communication satellite.

[Conventional technology]

Conventional equipment uses unmodulated waves (
This will be referred to as a beacon wave from now on. ), or a pilot such as a reference frequency within the currently used frequency band to control antenna tracking. In antenna control using the punisher's beacon wave, the frequency of the unmodulated wave emitted from one communication satellite is constant, so the frequency of the local oscillation frequency circuit that lowers the frequency to the required frequency is constant. . In the latter case, in antenna control using a reference pilot, only the reference pilot within the currently used frequency band is effective, and the reference pilots within other frequency bands are invalid. [Problem to be solved by the invention] In the above-mentioned conventional technology, in the case of antenna control using beacon waves, antenna control becomes impossible if the communication satellite does not emit beacon waves. Also.

In the case of antenna control using a reference pilot wave, there is no consideration given to the fact that if there is no reference pilot wave within the frequency band being used, it will be impossible to control the antenna. There was a problem that continued for a long time.

An object of the present invention is to always perform antenna control.

[Means to solve the problem]

The above object is achieved by providing the antenna control circuit with a control device for selecting one arbitrary reference carrier wave from a plurality of reference carrier waves.

[Effect]

The control device selects one arbitrary reference carrier wave from the plurality of reference carrier waves. Thereby, even when the reference carrier wave used for antenna control runs out, other reference carrier waves are sequentially selected, so that antenna control can always be performed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. FIG. 3 is a configuration diagram showing the positional relationship of the present invention. 2
0 is the antenna. 21 is a transmitting/receiving device for transmitting and receiving signals. 24 is an antenna driving device for changing the direction of the antenna 20; 325 is an antenna driving device for changing the direction of the antenna 20;
This is a reference carrier wave receiving device for branching the received wave from the reception transmission path 23 and receiving a reference carrier wave used for antenna control from the received wave. Reference numeral 26 denotes an antenna control device that issues a command to the antenna driving device to direct the directivity direction of the antenna toward the communication satellite so that the reception level of the reference carrier wave received by the reference carrier wave receiving device 25 is maximized. Reference numeral 27 denotes a frequency control device for determining the frequency of the reference carrier wave received by the reference carrier wave receiving device 25.

Next, the basic operation of the frequency control device for determining the frequency F& of the reference carrier wave will be explained using the drawings.

Generally, communication using a satellite is performed through a repeater within one communication satellite. As shown in FIG. 2, the repeater has frequency on the horizontal axis.9. Exists in each frequency band. Here, in order to simplify the explanation, three frequency bands 9, 10, and 11 are used.

Furthermore, one frequency band is further divided into several frequency bands. For example, it can be divided into four parts such as 12, 13, 14, and 15. Satellite communication is performed using any one of these finely divided frequency bands 12, 13, 14, and 15.

At that time, the frequencies used for one communication were selected, and since the radio waves passed through one communication satellite, unmodulated waves called pilots were used to eliminate frequency deviations along the route. put out.

On the other hand, some communication satellites emit unmodulated waves called beacons by themselves.

The present invention uses the pilot and beacon waves described above as reference carrier waves to control the antenna. FIG. 1 shows the characteristic features of the present invention (frequency converters 1, 2,
3.4 is a part where the local oscillator 5 also generates a frequency necessary for converting into the receiving frequency of the reference carrier receiving device 25. For example, 1 frequency converter 1 converts pilot 16 into 6 frequency converters 2 converts pilot 17 into 1 frequency converter 3
is the pilot 18, and the frequency converter 4 is the pilot 19.
? : You can think of it as a part to take out. The switching section 6 is.

, 4.

This is a part for inputting the frequency output from the local oscillator 92 to one of the frequency converters 1, 2, 3 and 4 according to a command issued by the control part 7. The control section 7 is.

Whether or not there is a reference carrier wave used for antenna control is determined from the signal sent from the reference carrier receiver 25 through the signal line 8, and if the reference carrier wave is not present, an instruction is given to the switching unit as to which frequency converter to use. Take out.

For example, assume that the control unit is now issuing a command to use pilot 19. And in the next moment.

Pilot 19 has been transmitted (Then, the reference carrier device cannot receive pilot 19, so the control unit 7
give a signal to Then, the control unit 7 issues a command to the primary to receive the pilot 18. Then, the pilot 18 is not transmitted again.

Similarly, a command is issued to receive pilot 17. As described above, one aspect of the present invention is to find out which of the reference carrier waves (pilot, beacon wave) being transmitted by a communication satellite currently in use and perform antenna control. In other words, one advantage of the present invention is that the directional direction of the antenna is always directed toward the communication satellite.

〔Effect of the invention〕

According to the present invention, since antenna control is always possible,
This has the effect that the directional direction of the antenna is always directed toward the communication satellite. In addition, even when no communication is being performed, the antenna's directivity is directed toward the communication satellite.
This has the effect of not losing sight of communication satellites.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of a frequency arrangement of satellite communication, and FIG. 3 is a system configuration diagram of the present invention. 1-4... Frequency conversion section, 6... Switching section. 7... Control unit, 25... Reference carrier wave receiving device. 26...Antenna control device. 27...Frequency control device.

Claims (1)

[Claims] 1. In an antenna control circuit consisting of a reference carrier reception circuit that receives a reference carrier wave from the received wave of a satellite earth station and an antenna control circuit that controls the drive of the antenna, an arbitrary reference carrier wave is generated from a plurality of reference carrier waves. An antenna characterized in that it is provided with a control device for selecting a reference carrier wave, and when the reference carrier wave used for antenna control runs out, it sequentially selects other reference carrier waves, thereby making it possible to always control the antenna. control method.