JPH02209026A - Satellite signal reception system - Google Patents

Abstract

PURPOSE:To attain a reception successively through the use of other satellite transponder when a transponder of one satellite is faulty by providing 1st and 2nd satellite signal reception sections, plural switches changing over a vertical polarized wave and horizontal polarized wave signal being its output and a receiver. CONSTITUTION:A couple of binary distributers 20, 21 and 22, 23 are provided respectively on a 1st satellite signal reception section Af and a 2nd satellite signal reception section Bf. Moreover, a couple of 1st switches 6af and 6bf and a couple of receivers 7af, 7bf are provided. When a transponder of a 1st communication satellite is failed, even when a satellite signal having the same information content as a stopped wave is sent by using any of transponders for vertical or horizontal polarized waves in a 2nd communication satellite 1b, the wave is selected by a 2nd switch 8f and the wave is selected by a receiver 7af of the post-stage. A 2nd switch 8f is thrown to make a 2nd contact 8Bf and a common terminal 8Cf conductive and a 1st switch 6bf of the pre-stage of the binary distributer 9f is thrown to make a 1st terminal 6Abf and a 3rd terminal 6Cbf conductive, then a vertically polarized wave signal from the 2nd satellite 1b is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a satellite signal receiving system for receiving signals from various satellites transmitted by vertically or horizontally polarized waves.

(Prior Art) Various communication satellites that transmit vertically or horizontally polarized signal radio waves (herein referred to as satellite signals) toward the ground are scheduled to be launched. There are also plans to install a television joint reception system that will receive satellite signals from these satellites at the head end and distribute them to each terminal device.

(Problem to be Solved by the Invention) In the TV joint reception system that receives satellite signals as described above, for example, if the transponder of the communication satellite breaks down, the satellite signal will stop, so important information will not be transmitted to each terminal device. I end up not being able to send it. However, since the satellite is far away, it is not possible to simply go and repair it. Therefore, we focused on the fact that multiple communication satellites were being launched, and
Even if one satellite's transponder fails, the other satellite's transponder may be able to send out a signal corresponding to the stopped signal so that the satellite signal is not interrupted, but a joint television reception system is better suited to this. It cannot be done.

SUMMARY OF THE INVENTION An object of the present invention is to provide a satellite signal receiving system that can continue to receive satellite signals even if a transponder of a communication satellite fails.

(Means for Solving the Problems) In order to achieve the above object, the means described in the claims above have been taken, and their effects are as follows.

(Operation) From the first satellite, a vertically polarized satellite signal of channel 1, for example, and a horizontally polarized satellite signal of channel 11 are sent. Further, from the second satellite, a vertically polarized satellite signal of channel 1, for example, and a horizontally polarized satellite signal of channel 2 are transmitted.

In the first satellite signal receiving section, the satellite signal from the first satellite is received by a receiving antenna, and is separated into a vertically polarized signal and a horizontally polarized signal by a branching filter for orthogonal polarization separation. Now the first
A second switch is provided between the vertical polarization output of the orthogonal polarization separation branching filter of the satellite signal receiving unit and the first switch, and the first contact of the second switch is connected to the first switch. The vertical polarization output of the orthogonal polarization splitter of the satellite signal receiving section is
The contacts are connected so that the vertically polarized wave output of the orthogonal polarized wave splitter of the second satellite signal receiving section is added, and the common terminal is connected to the first
Assume that the switch is connected to the switch side of the switch. Since the second switch is switched so that the first contact and the common terminal are electrically connected, the vertically polarized wave output of the orthogonal polarization splitter described above passes through the second switch. , is added to the first switch at the subsequent stage.

Further, the horizontal polarization output of the above-mentioned orthogonal polarization separation branching filter is directly applied to the first switch at the subsequent stage. The first switch transmits the vertically polarized signal sent from the first satellite to the subsequent receiver, where it is tuned and converted into a television signal. The signal from the receiver of the first satellite signal receiving section is sent to a subsequent mixer.

Next, in the second satellite signal receiving section, the signal sent from the second satellite is received by the receiving antenna, and separated into a vertically polarized signal and a horizontally polarized signal by the orthogonal polarization splitter. . These double side signals are transmitted to the first satellite signal receiver of the second satellite signal receiver.
It joins the switching device.

The first switch sends the vertically polarized signal to the subsequent stage, and the subsequent receiver selects the channel 1 signal described above and converts it into a television signal. On the other hand, in the second satellite signal receiving section, the vertically polarized wave output of the orthogonal polarization splitter is also applied to the second contact of the second switch, but it does not affect the subsequent stage.

The television signals of different channels from the receiver of the first satellite signal receiving section and the receiver of the second satellite signal receiving section are mixed by a mixer and sent to the subsequent stage, and are sent to the television receiver. Received.

Next, suppose, for example, that the vertically polarized signal of the first satellite is stopped due to a transponder failure or the like.

In this case, in addition to the normal channel 1 signal, a channel 3 signal with the same information content as the vertically polarized signal of the first satellite is also transmitted using the vertically polarized wave of the second satellite. On the receiving system side, a second switch is switched to bring the second contact and the common terminal into electrical continuity. Further, the receiver connected to the first switching device of the first satellite signal receiving section is tuned to select the channel 3 signal from the second satellite.

In the second satellite signal receiving section, signal processing is performed in the same manner as before the transponder failure described above. However, the vertical polarization output of the orthogonal polarization splitter is both channel 1 and channel 3 signals, and these are applied to the second contact of the second switch and the first switch, respectively. are different.

In the first satellite signal receiving section, the vertically polarized wave output of the orthogonal polarization splitter does not appear, but the horizontally polarized signal is output.

This signal is processed in the same manner as before the transponder failure described above.

On the other hand, the vertically polarized wave output of the orthogonal polarization separation branching filter of the second satellite signal receiving section, which is added to the second switching device, passes through one first switching device of the first satellite signal receiving section and then passes through the second switching device. The 0 receiver that joins the 0 receiver selects the channel 3 signal,
A conversion to a television signal is made and sent to a mixer. In the mixer, this television signal and other television signals from other receivers are mixed and output to the subsequent stage.

(Example) The drawings showing the embodiments of the present application will be described below.

Figure 1 shows the system diagram of the satellite signal reception system.
A indicates a first satellite signal receiving section, and B indicates a second satellite signal receiving section. 1a is a first communication satellite, and 1b is a second communication satellite. First, the first satellite signal receiving section A will be explained. 2a is a receiving antenna that receives satellite signals from the communication satellite 1a. 3a is a branching filter for orthogonal polarization separation, also called OMT. 3Aa represents an input end, 3Ba represents a vertical polarization output end, and 3Ca represents a horizontal polarization output end.

4a and 5a are block down converters, 12 GH
The frequency of the satellite signal in the Z band is converted into the first intermediate frequency signal of the satellite in the IGHz band. Reference numeral 6a denotes a first switch, for example, a high frequency relay is used. First switch 6
In a, 6Aa is the first end, 6Ba is the second end, 6Ca
indicate the third ends, respectively. 7a is a receiver which selects one desired station from among a plurality of input first intermediate frequency signals, converts the frequency into a television signal, and outputs the signal.

Next, the second switch 8 is connected between the first switch 6a of the first satellite signal receiving section A and the receiver 7a. In the second switch 8, 8A indicates a first contact, 8B a second contact, and 8C a common terminal.

Next, the second satellite signal receiving section B has the same configuration as the first satellite signal receiving section A. 2b is an antenna that receives a satellite signal from the second satellite 1b. Regarding other devices, those corresponding to the first satellite signal receiving section A are indicated by the same reference numerals with the alphabet a replaced by b, and duplicate explanations will be omitted.

A two-way divider 9 is connected to the rear stage of the first switch 6b of the second satellite signal receiving section B. One output of this two-way divider 9 is connected to the receiver 7b, and the other output is connected to the second contact 8B of the second switch 8 mentioned above.

Next, 12 is an antenna for receiving terrestrial broadcast waves, and 13 is a mixer. 14 is the trunk line for common television reception, and coaxial cables are used. 15 is a trunk branch amplifier, 16 is a distributor, 17 is a tap-off, 18 is a drop-in line, and 19 is a television receiver as a terminal device. As is well known, coaxial cables are used for the distribution line 16 and the lead-in line 18.

Next, the operation of the above satellite signal receiving system will be explained.

(I) When the two satellites are operating normally A satellite signal of channel 1 with vertical polarization and channel 11 with horizontal polarization is sent from the first communication satellite 1a. Further, from the second communication satellite 1b, satellite signals of channel 1 with vertical polarization and channel 2 with horizontal polarization are sent. The second switch 8 is set to conduct the first contact 8A and the common terminal 8C as shown in the first diagram.

First, the first satellite signal receiving section A receives a vertically polarized satellite signal from the first communication satellite 1a, and in the second case, the first switching devices 6a + 6b are respectively set at the positions shown in the first diagram. channel 1 with vertical polarization from the first satellite 1a.
The signal is transmitted through the following path. Receiving antenna 2a
→ Orthogonal polarization separation branching filter 3a → converter 4a → first switch 6a → channel selection by receiver 7a. Also, the second satellite 1b
The channel 1 signal with vertical polarization is transmitted by the following path. Receiving antenna 2b → duplexer 3b for orthogonal polarization separation
→ converter 4b → first switch 6b → 2-way divider 9 → channel selection with receiver 7b. The signals of the channels selected by the receivers 7a and 7b are frequency-converted by the selected receivers into television signals of mutually different channels, and then sent to the subsequent stage. The television signal from each receiver is combined with the terrestrial television signal from the antenna 12 into a mixer 1.
3 and sent to the television receiver 19 at the subsequent stage.

(Seal) When the transponder of one satellite fails For example, suppose that the vertically polarized transponder of the first communication satellite 1a fails. In this case, a satellite signal having the same information content as vertically polarized channel 1 of the first communication satellite 1a is transmitted on vertically polarized channel 3 of the second communication satellite 1b. The vertically polarized channel 1 and channel 3 satellite signals from the second satellite 1b are transmitted through the following path. Receiving antenna 2b → orthogonal polarization separation splitter 3b → converter 4b → first switching device 6b → 2-way divider 902 The output from the divider 9 is divided into two outputs, one of which is added to the receiver 7b,
As mentioned above, the signals of 10 channels sent in vertically polarized waves are selected. On the other hand, the signal from the two-way divider 9 is
It is also added to the switching device 8.

Since the second switch 8 is set so that the second contact 8B and the common terminal 8C are electrically connected, the signal from the two-way divider 9 goes back and forth through the second switch 8. Further, the receiver 7a selects the vertically polarized signal sent on channel 3.

In addition to the above-mentioned channel selection, the receivers 7a and 7b also perform frequency conversion into television signals, and send the signals to the subsequent stage as in the case (1) above.

In addition, although the case where only the vertically polarized signal from each communication satellite 1aslb is received has been described above, in the first switch 6a of the first satellite signal receiving section A, the second end 6Ba and the third end 6Ca are connected to each other. If it is switched to conductivity, it becomes possible to receive the horizontally polarized signal from the first communication satellite 1a. Also the second
In the first switch 6b of the satellite signal receiving section B, the second
By switching the end 6Bb and the third end 6Cb to conduction, it becomes possible to receive the horizontally polarized signal from the second communication satellite 1b.

Next, Figure 2 shows a system diagram of a part of a satellite signal receiving system with a different configuration. Items with the same or equivalent functions as those in the front are indicated with the same reference numerals and the letter e, and redundant explanations are given. will be omitted (the following will also be indicated with the alphabet f for the same idea). In Figure 2, the second
The switching B8e is provided immediately after the down converter 5ae that converts the frequency of the horizontally polarized output in the first satellite signal receiving section Ae. In this way, the system is an example that can be used in the event that the horizontally polarized transponder of the first satellite 1a fails.

Next, FIG. 3 shows a system diagram of a part of a further different satellite signal reception system. In this example, the first satellite signal receiving section Af is provided with a pair of two-way dividers 20, 21, and the second satellite signal receiving section Bf is also provided with a pair of two-way splitters 22, 23. There is.

The first satellite signal receiving section Aft is provided with a pair of first switches 6af and a pair of receivers 7af. Further, in the second satellite signal receiving section Bf, a pair of first switches 6bf and a pair of receivers 7bf are provided. In this example, if the transponder of the first communication satellite fails, either the vertically polarized or horizontally polarized transponder of the second communication satellite 1b is used to transmit the satellite signal with the same information content as that of the stopped signal. Even if it is sent out, the second switching device 8
It can be selected with f, and the channel can be selected with receiver 7af at the subsequent stage. The second switch 8f is connected to the second contact 8Bf and the common terminal 8Cf.
The first switch 6bf at the front stage of the two-way distributor 9f is set to conduct between the first end 6Ab f and the third end 6C.
If bf is set to conduct, the vertically polarized signal from the second satellite 1b will be transmitted to the second end 6Bbf and the third end 6Cbf.
If the channels are set to conduct, horizontally polarized signals from the second satellite 1b can be tuned.

(Effect of the invention) As described above, in the present application, one of the plurality of communication satellites
If one satellite's transponder fails, the other satellite's transponder can be used to continue receiving satellite signals.

[Brief explanation of the drawing]

The drawings relate to embodiments of the present application, and FIG. 1 is a system diagram of a satellite signal receiving system, FIG. 2 is a system diagram of a part of a different satellite signal receiving system, and FIG. 3 is a system diagram of a further different satellite signal receiving system. figure. 1a...1 first satellite, 1b...second satellite, A...
- First satellite signal receiving section, B... Second satellite signal receiving section, 2a, 2b... Receiving antenna, 3a, 3b...
Duplexer for orthogonal polarization separation, 6as6b...first switch, 7a, 7b...receiver, 8, fist, second switch,
8A...6 first contact, 8B...second contact, 8C...
Common terminal, 13...mixer, 19...φ television receiver. Patent applicant: Maspro Electric Works Co., Ltd. Representative Takashi Hatade

Claims (1)

[Claims] A satellite signal reception system that receives vertically polarized and horizontally polarized satellite signals sent from multiple satellites, the first
a first satellite signal receiving section that receives a satellite signal from a satellite; a second satellite signal receiving section that receives a satellite signal from a second satellite; the first satellite signal receiving section and the second satellite signal receiving section; and a mixer that mixes the signals from the satellite signal receiving section of the terminal and sends the mixture to the television receiver of the terminal, and the first satellite signal receiving section and the second satellite signal receiving section each have a receiving antenna and a mixer. , a branching filter for orthogonal polarization separation that separates and outputs the signal from this receiving antenna into vertically polarized waves and horizontally polarized waves; It consists of a first switching device that conducts at least one side of the polarized wave output with a subsequent stage, and a receiver connected to the subsequent stage of this first switching device, and further includes a At least one output of the orthogonal polarization separation branching filter on one side of the satellite signal receiving section and a receiver connected at the subsequent stage are connected so that the one output is applied to the first contact of the receiver. A second switching device is interposed which is connected to transmit the signal from its common terminal to the receiver at the subsequent stage. A satellite signal receiving system characterized in that one output of the wave transmitter is connected to a second contact of the second switch.