JP2004297221A - Satellite signal receiving transmission system and satellite signal retransmitter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a satellite signal receiving transmission system which simplifies the installing work and makes radio transmission signals available in a narrow band. <P>SOLUTION: The system comprises a VHF antenna 1, a UHF antenna 2, a third satellite receiving antenna 3 for receiving BS signals and 110 CS signals, a first satellite receiving antenna 12 for receiving satellite signals from the JCSAT-3 satellite, i.e., sets of V1 and H1 satellite signals in a frequency band f1 of 12.20-12.75 GHz. A first transceiver is composed of a first retransmitter for wirelessly transmitting the V1 and H1 signals outputted from the first satellite receiving antenna 12 to the receive side, and a re-receiver 46 installed at e.g. a residence for receiving the V1 and H1 signals wirelessly transmitted from the first retransmitter. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a satellite signal receiving and transmitting system for receiving and transmitting satellite broadcasting or a satellite signal, and more particularly to a satellite signal receiving and transmitting system for receiving signals of two satellites having overlapping frequency bands, and a satellite suitable for the system. The present invention relates to a signal retransmission device.
[0002]
[Prior art]
As satellites used for broadcasting and communication, in addition to BS satellites and CS satellites, satellites such as JCSAT-3 and JCSAT-4 used as SkyPerfect TV (registered trademark) are known. The number of satellites used for communication tends to further increase. As a satellite broadcasting system for receiving such a satellite broadcasting, for example, a BS and a JCSAT-4 satellite signal are transmitted together with a terrestrial broadcasting signal via one signal cable, and two satellite signals having overlapping portions in a frequency band are provided. For example, a system is disclosed in which a JCSAT-3 satellite signal and a CS signal are transmitted over different signal cables, and four satellite signals and a terrestrial broadcast signal are transmitted and received over a total of three signal cables. (Patent Document 1).
[0003]
A first antenna for receiving a broadcast signal transmitted from a satellite, and a radio for outputting at least a broadcast signal having the same frequency as the received broadcast signal by amplifying at least the broadcast signal received by the antenna; A circuit unit and a second antenna for receiving a transmission broadcast signal output from the wireless circuit unit, so that even in an insensitive area where a broadcast signal from a satellite cannot be directly received, it can be reliably received without providing a large-scale facility. A satellite broadcasting system has been devised (Patent Document 2).
[0004]
[Patent Document 1]
JP-A-11-298810
[Patent Document 2]
JP-A-10-308695
[0005]
[Problems to be solved by the invention]
However, although the system of Patent Document 1 can transmit to the receiving end with a signal cable one less than the number of receiving satellites, since three signal cables are required, pulling in and wiring the signal cables are troublesome, Each room required three television terminals for each signal cable. Furthermore, when receiving both signals of JCSAT-3 and JCSAT-4, satellite switching means for switching the received signal is required for each television terminal.
[0006]
Further, in the system of Patent Document 2, since the gap filler device as the retransmitting device retransmits at the same frequency, it may not be able to cope with the standard frequency of the receiving end. Facilities were not available. Furthermore, when satellites having overlapping frequencies were used, new individual cables had to be laid, and the installation work was troublesome.
[0007]
Further, as a retransmitting device, there is known a retransmitting device that uses two sets of satellite signals composed of sets of different polarizations having overlapping frequencies, performs frequency conversion in a line to an array having no overlapping portion, and performs wireless transmission. . However, in this case, since the frequency is converted into a 1 GHz width for each satellite, a total bandwidth of 2 GHz is required. Therefore, there is a problem that the application bandwidth of the amplifier, the mixer, and the like must be widened, and the number of required components increases, and expensive components are required, thereby increasing the manufacturing cost.
[0008]
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a satellite signal receiving and transmitting system and a satellite signal retransmitting device that can simplify installation work and narrow a radio transmission signal.
[0009]
[Means for Solving the Problems]
A satellite signal receiving and transmitting system according to the present invention comprises: a first satellite receiving antenna for receiving a first satellite signal comprising a set of different polarizations having overlapping frequencies; and a different polarization having similar overlapping frequencies. A second satellite receiving antenna configured to receive a second satellite signal, a first frequency converting unit configured to frequency-convert the received first satellite signal to a frequency different from that of the second satellite signal and output the same, (1) a first transmitting and receiving device for wirelessly transmitting an output signal of the frequency conversion means to a receiving side, a second transmitting and receiving device for wirelessly transmitting an output signal of a second satellite receiving antenna to a receiving side, and A second frequency conversion means for frequency-converting an output signal of the first transmission / reception device and an output signal of the second transmission / reception device to mutually different frequency bands is provided.
[0010]
According to a second aspect of the present invention, there is provided a satellite signal retransmitting apparatus, comprising: a first satellite receiving antenna for receiving a first satellite signal comprising a set of different polarizations having overlapping frequencies; A second satellite signal receiving a second satellite signal, a first frequency conversion means for converting the frequency of the received first satellite signal to a frequency different from that of the second satellite signal, and outputting the converted signal; A second frequency converting means for converting the frequency of the second satellite signal into a frequency different from that of the first satellite signal and outputting the converted signal, a first transmitting and receiving device for wirelessly transmitting an output signal of the first frequency converting means to a receiving side, A second transmission / reception device that wirelessly transmits an output signal of the second frequency conversion means to a reception side, and an output signal of the first transmission / reception device and an output signal of the second transmission / reception device transmitted on the reception side. different Configured to include a second frequency converting means for frequency converting the waveband, the.
[0011]
According to a third aspect of the present invention, in the satellite signal retransmitting apparatus, the first transmitting / receiving apparatus wirelessly transmits the output signal of the preceding stage to the receiving side, and the first receiving apparatus receives the wireless transmitting signal of the first transmitting antenna. And a second transmitting / receiving apparatus, wherein the second transmitting / receiving apparatus includes a second transmitting antenna for wirelessly transmitting the output signal of the preceding stage to the receiving side, and a second receiving antenna for receiving the wireless transmitting signal of the second transmitting antenna. The half-value angle of at least one main lobe of the first transmission antenna and the second transmission antenna is smaller than the half-value angle of the main lobe of the first reception antenna and the second reception antenna to be wirelessly transmitted. Are also configured to be large.
[0012]
A satellite signal retransmitting apparatus according to a fourth aspect of the present invention includes a satellite receiving antenna for receiving a satellite signal composed of a set of different polarizations having overlapping frequencies, and a satellite signal received by the satellite receiving antenna for receiving the satellite signal. It is configured to include a wireless circuit unit that converts the signal to a different frequency and outputs the signal, and a retransmission antenna that retransmits an output signal of the wireless circuit unit to a predetermined broadcast service area on the ground.
[0013]
In the satellite signal retransmitting apparatus according to the fifth aspect of the present invention, the satellite receiving antenna is also overlapped with the first satellite receiving antenna receiving the first satellite signal having the overlapping frequency and having a different polarization set. A second satellite receiving antenna for receiving a second satellite signal having a frequency and comprising a set of different polarizations, wherein the radio circuit section converts the first satellite signal received by the first satellite receiving antenna into a first satellite signal. A first radio circuit unit that converts the frequency of the satellite signal of the second satellite signal so that there is no overlapping part of the frequency and outputs the second satellite signal; A second radio circuit unit outputting at the same frequency, wherein a retransmission antenna retransmits an output signal of the first radio circuit unit, and an output signal of the second radio circuit unit. A second retransmit antenna for retransmitting Et al constructed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of a satellite signal receiving and transmitting system according to the present invention, and FIGS. 2A to 2D show frequency spectra for explaining a change in a receiving frequency in this system.
[0015]
In FIG. 1, 1 is a VHF antenna, 2 is a UHF antenna, 3 is a third satellite receiving antenna for receiving a BS signal and a 110 / CS signal, and a VHF received signal and a UHF received signal are mixed by a mixer 4, It is input to a first booster 5 having a mixing function. The BS and CS signals received by the third satellite receiving antenna 3 are IF-converted into the frequency band shown in FIG. 2A by a built-in converter, output, and input to the first booster 5. Specifically, the BS signal (BS) is IF-converted to a frequency band of 1032 to 1489 MHz, the CS right-polarized signal (CS-R) is IF-converted to 1595 to 2071 MHz, and the CS left-polarized signal (CS-L) is converted. ) Is IF-converted to 2126 to 2602 MHz.
[0016]
The output of the first booster 5 is transmitted by one signal cable 10, and is branched and retracted by the branching devices 6a and 6b, for example, according to the number of dwelling units to be retracted, and a distributor 7 is provided in the retracted dwelling unit. For example, they are distributed according to the number of rooms. Each of the distributed signals is connected to one of the first television terminals 11a among the television terminals 11 serving as reception ends. The first television terminal 11a is provided with a branching device 24. One branch output is connected to the BS / CS tuner 25 and connected to the television receiver 26, and the other branch output is directly connected to the television receiver 26. You. Thus, the terrestrial broadcast and the BS and CS signals can be received.
[0017]
As shown in FIG. 3, reference numeral 12 denotes a satellite signal from the JCSAT-3 satellite, that is, a satellite signal of a set of different polarizations having overlapping frequencies, in a frequency band f1 of 12.20 to 12.75 [GHz]. The first satellite receiving antenna receives a set of satellite signals (see FIG. 2B) of a vertically polarized signal (hereinafter referred to as “V1 signal”) and a horizontally polarized signal (hereinafter referred to as “H1 signal”). . The first satellite receiving antenna 12 includes a first receiving feed horn section 41 as a receiving section for receiving these satellite signals, and a quadrature polarization that separates the V1 signal and the H1 signal input from the first receiving feed horn section 41 into polarization. A demultiplexer for separation (hereinafter referred to as "first OMT") 42, and a first coaxial waveguide converter for transmitting the demultiplexed output signal of the first OMT 42 to respective transmission lines for V1 and H1 signals 43, 43. The first satellite receiving antenna 12 is connected to a first transmitting / receiving device 44 for wirelessly transmitting the received V1 signal and H1 signal to a dwelling unit as a receiving side while keeping the same frequency band.
[0018]
The first transmitting / receiving device 44 includes a first retransmitting device 45 for wirelessly transmitting the V1 signal and the H1 signal output from the first satellite receiving antenna 12 to the receiving side, and a V1 signal wirelessly transmitted from the first retransmitting device 45. And a re-receiving device 46 installed in, for example, a dwelling unit to receive the H1 signal.
[0019]
The first retransmitting device 45 amplifies the V1 signal and the H1 signal on each of the separated transmission lines and removes unnecessary signals, and a first low noise amplifier (hereinafter, “first LNA”) 47, the transmission cables 16a, 16a, and , And a first retransmission antenna 51 for retransmitting the combined V1 signal and H1 signal. Here, the first LNA 47 constitutes a second wireless circuit unit according to claim 5. The first LNA 47 is configured by arranging amplifiers 47a, 47a having an amplifying function and BPFs 47b, 47b having a function of removing unnecessary signal components on each transmission line of the V1 signal and the H1 signal.
[0020]
The first retransmission antenna 51 is combined with a first orthogonal polarization combiner (hereinafter, referred to as “first combiner”) 48 that combines the V1 signal and the H1 signal input from the first reception feed horn unit 41. And a first transmission feed horn section 49 which is a retransmission section for the V1 signal and the H1 signal.
[0021]
The V1 signal and the H1 signal output from the first coaxial waveguide converter 43 of the first satellite receiving antenna 12 are input to the first LNA 47, amplified by the amplifiers 47a, 47a so that they can be transmitted, and transmitted to the BPFs 47b, 47b. The signal is input to the first combiner 48 of the first retransmission antenna 51 via the first retransmission antenna 51. The V1 signal and the H1 signal synthesized by the first synthesizer 48 are the V1 signal and the H1 signal in the frequency bands f3 and f4 of the frequency bands 12.20 to 12.75 [GHz] shown in the frequency spectrum of FIG. The signal is re-emitted from the first transmission feed horn section 41 to the re-receiving device 46 of the dwelling unit.
[0022]
On the other hand, as shown in FIG. 4, 13 is a JCSAT-4 satellite, that is, a vertically polarized wave in a frequency band f2 of 12.20 to 12.75 [GHz] as a satellite signal of a set of different polarized waves having overlapping frequencies. This is a second satellite receiving antenna that receives a set of satellite signals (see FIG. 2B) of a signal (hereinafter, referred to as “V2 signal”) and a horizontally polarized signal (hereinafter, referred to as “H2 signal”). The second satellite receiving antenna 13 includes a second receiving feed horn section 61, a second OMT 62, and a second coaxial waveguide converter 63, similarly to the first satellite receiving antenna 12, and includes a second satellite receiving antenna 13. A second transmitting / receiving device 13 converts the received V2 signal and H2 signal into a frequency band different from the V1 signal and H1 signal of the first satellite receiving antenna 12 and wirelessly transmits the received signal to, for example, a dwelling unit. It is connected to the.
[0023]
The second transmitting / receiving device 64 includes a second retransmitting device 65 that wirelessly transmits the V2 signal and the H2 signal output from the second satellite receiving antenna 13 to the receiving side, and a V2 signal that is wirelessly transmitted from the second retransmitting device 65. And a re-receiving device 46 installed in the dwelling unit for receiving the H2 signal.
[0024]
The second retransmitting device 65 includes a second low-noise amplifier (hereinafter, “second LNA”) 67 that amplifies and removes an unnecessary signal on a transmission line on which the V2 signal and the H2 signal are separated, and a V2 signal and an H2 signal. A first converter 66 as a first frequency converter for converting the frequency band into a frequency band different from the V1 signal and the H1 signal; transmission cables 16b, 16b; and a second transmitter for retransmitting the combined V2 signal and H2 signal. And two retransmission antennas 68. Here, the second LNA 67 and the first converter section 66 constitute a first wireless circuit section of claim 5. The second LNA 67 is configured by arranging amplifiers 67a, 67a having an amplifying function and BPFs 67b, 67b for removing unnecessary signal components on each transmission line of the V2 signal and the H2 signal.
[0025]
The first converter unit 66 includes a local oscillator 66a that generates a local frequency for frequency-converting the V2 signal and the H2 signal into frequency bands f5 and f6 shown in FIG. 2C, and a distributor 66b that splits the local signal into two. And a mixer 69 for mixing the local signal distributed and output from the distributor 66b via the BPF 66c with the V2 signal output from the second LNA 67 at the preceding stage to perform IF conversion, and the mixer 69 performs an IF-V2 signal in the frequency band f5. And an amplifier 66e for amplifying the output signal subjected to the IF conversion via the BPF 66d. Similarly, the H2 signal is IF-converted into an IF-H2 signal in the frequency band f6 by the local oscillator 66a. Similarly to the first retransmission antenna 51, the second retransmission antenna 68 includes a second orthogonal polarization combiner (hereinafter referred to as “second combiner”) 70 and a second transmission feed horn unit 71. Have been.
[0026]
The IF-V2 signal and the IF-H2 signal output from the second coaxial waveguide converter 63 of the second satellite receiving antenna 13 are amplified and shaped so as to be transmittable by the second LNA 67, respectively, and are formed into the first signal. The signal is IF-converted into an IF-V2 signal and an IF-H2 signal by the converter section 66 and input to the second combiner 70 of the second retransmission antenna 68. Then, the IF-V2 signal and the IF-H2 signal synthesized by the second synthesizer 70 correspond to the frequency bands f5 and f6 of the frequency bands 11.00 to 11.55 [GHz] shown in the frequency spectrum of FIG. The signal is re-emitted from the second transmission feed horn section 71 to the re-receiving device 46 as an IF-V2 signal and an IF-H2 signal.
[0027]
As shown in FIG. 5, the re-receiving device 46 includes a first re-receiving antenna 72 as a re-receiving unit for V1 and H1 signals, and a second re-receiving antenna 72 as a re-receiving unit for IF-V2 and IF-H2 signals. A receiving antenna 73, an RF amplifier unit 75 configured to be able to output a signal to be amplified among the signals received by the first and second receiving antennas 72 and 73 by a signal switching circuit 74, and an output of the RF amplifier unit 75; And a second converter section 76 as second frequency conversion means for converting the frequency of the signal.
[0028]
The first re-receiving antenna 72 is configured so that the received V1 signal and H1 signal can be polarization-separated and output to an individual transmission line, and the second re-receiving antenna 73 receives the received IF-V2 signal and IF- The H2 signal is configured to be polarized and separated and output to an individual transmission line. The RF amplifier unit 75 includes a V1 signal amplifier 77a, an H1 signal amplifier 77b, an IF-V2 signal amplifier 78a, and an IF that amplify the separated and output V1, H1, IF-V2, and IF-H2 signals, respectively. -An H2 signal amplifier 78b is provided. Each of the amplifiers 77a, 77b, 78a, and 78b has a control terminal for switching ON / OFF of the amplification operation, and the control terminal is configured to be able to switch and control these amplifiers 77a, 77b, 78a, and 78b. It is connected to a signal switching circuit 74.
[0029]
The output terminals of the V1 signal amplifier 77a and the H1 signal amplifier 77b are connected to a subsequent amplifier 77, and the output terminal of the amplifier 77 is connected to one input terminal 76a of the second converter unit 76. The second converter unit 76 is a local converter for frequency-converting the V1 signal and the H1 signal input via the BPF into the IF-V1 signal of the frequency band f7 and the IF-H1 signal of f8 shown in FIG. A first oscillator 79 having a frequency is provided. The IF-V1 signal and the IF-H1 signal of f8 frequency-converted by the first oscillator 79 are amplified by the output amplifier 82 and output from the common output terminal 76c of the second converter unit 76 via the coupling capacitor C1.
[0030]
The output terminals of the IF-V2 signal amplifier 78a and the IF-H2 signal amplifier 78b are connected to a subsequent amplifier 78, and the output terminal of the amplifier 78 is connected to the other end of the second converter 76 as the second frequency conversion means. It is connected to the input terminal 76b. The second converter 76 converts the IF-V2 signal and the IF-H2 signal into an IF2-V2 signal in the frequency band f9 and an IF2-H2 signal in the frequency band f10 shown in FIG. A second transmitter 81 is provided. The IF2-V1 signal and the IF2-H1 signal are amplified by the output amplifier 83 and output from the input / output terminal 76c of the second converter 76 via the coupling capacitor C2.
[0031]
The input / output terminal 76c of the second converter 76 is connected to the signal switch 20, which will be described later. The output is connected to a second television terminal 11b constituting a receiving end provided adjacent to the first television terminal 11a. The second television terminal 11b is connected to a JCSAT tuner 27 for receiving JCSAT-3 and JCSAT-4 satellite signals, and then to a television receiver 26. Thus, the satellite signals of JCSAT-3 and JCSAT-4 can be received.
[0032]
The signal switch 20 is configured as shown in the block diagram of FIG. 6, where 30 is a duplexer, 33a is a second distributor that distributes four, 33b is a first distributor that distributes four, and 34 is output switching means. It is an output switch. The splitter 30 splits the input received signal shown in FIG. 2D into two and outputs the split signal. The first demultiplexed output 30a outputs the frequency bands f7 and f8 of FIG. 2D, that is, the IF-V1 signal and the IF-H1 signal of JCSAT-3, and the second demultiplexed output 30b outputs the frequency bands of f9 and f10. That is, it outputs the IF2-V1 signal and the IF2-H1 signal of JCSAT-4. The first split output 30a is split into four by the second splitter 33a, and is connected to one port of the output switch 34, respectively. The first split output 30b is split into four by the first splitter 33b, and is connected to the other port of the output switch 34.
[0033]
The output switch 34 is configured by a relay, and performs a switching operation with a satellite identification signal composed of, for example, a pulse signal output from the JCSAT tuner 27 connected to the second television terminal 11b at the receiving end via a signal line. The satellite identification signal is separated by the separation circuit 35a interposed in the signal line and input to the relay control circuit 35b, and the relay control circuit 35b is operated to switch the output switch 34. Further, the satellite identification signal is input from the input / output terminal 76c of the second converter unit 76 to the preceding signal switching circuit 74 via the output terminal 76d, and a required satellite signal is synchronized with the switching operation of the output switch 34. The switching operation is performed so as to select and amplify and output.
[0034]
In this way, the signal of JCSAT-3 and the signal of JCSAT-4 can be selectively received by the operation of the tuner 27 for JCSAT, and the received signal of JCSAT-3 is converted into the standardized frequency band by the second converter unit 76. The converted output is received by the JCSAT tuner 27. Further, the received signal of JCSAT-4 is IF-converted by the first converter 66 of the second satellite receiving antenna and then IF-converted again by the second converter 76 on the receiving side, and the JCSAT tuner standardized similarly. At 27, reception becomes possible.
[0035]
As described above, since the JCSAT-4 satellite signal is frequency-converted without changing the polarization set of the JCSAT-3 and JCSAT-4 satellite signals, the bandwidth of the radio transmission signal on the radio transmission path is reduced to about the conventional bandwidth. The band can be narrowed to about 1 GHz, which is half the width of 2 GHz. Therefore, the manufacturing cost can be reduced without using expensive parts corresponding to a wide band. It is possible to receive with a conventional standardized tuner.
[0036]
Also, in this embodiment, a user who wishes to use a system in an insensitive area such as behind a building with respect to the two satellites JCSAT-3 and JCSAT-4, or an apartment where it is difficult to perform wiring work by adding a transmission cable or the like. And the like can receive the satellite signals of JCSAT-3 and JCSAT-4. As an example, the first and second satellite receiving antennas 12 and 13 are installed on the roof of a building that can receive both satellite signals, and the first and second retransmitting antennas 51 and 68 are directed from the roof to a dead area on the ground. Is arranged, the user who wishes to use in the blind area can eliminate a large-scale wiring work by preparing the re-receiving device 46, the signal switch 20, the tuner 27 (the device shown in a two-dot chain line in FIG. 1), and the like. In addition, these satellite signals can be received by simplifying the installation work.
[0037]
FIG. 7 is a directional characteristic diagram showing the half value angle of the main lobe of the radio transmission signal radiated from the first retransmission antenna 51 of the first retransmission device 45, and FIG. FIG. 14 is a directivity characteristic diagram illustrating a half-value angle of a main lobe of the re-receiving antenna 72. As can be seen from FIGS. 7 and 8, the half value angle of the first retransmission antenna 51 used in the present embodiment is larger than the half value angle of the first retransmission antenna 72. In the present embodiment, this is realized by forming the opening diameter of the first transmission feed horn portion 49 of the first retransmission antenna 51 smaller than the opening diameter of the feed horn portion of the first retransmission antenna 72. Since the main lobe of the first re-receiving antenna 72 is narrowed in this way, it is possible to prevent interference with satellite signals directly incident from JCSAT-3 and JCSAT-4. Further, the retransmission service area can be widened, and even if the installation position or the installation direction of the first retransmission antenna 51 is slightly shifted, the reception strength of the retransmission side can be improved without deteriorating the quality of the radio transmission signal. The wireless transmission efficiency can be improved while securing the wireless transmission efficiency.
[0038]
Note that the present invention is not limited to the above-described embodiment, and may be implemented by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention, as exemplified below. .
(1) In addition to the satellite signals of JCSAT-3 and JCSAT4, the BS signal and the 110 / CS signal may be wirelessly transmitted. For example, when wirelessly transmitting the BS signal and the 110 / CS signal without changing the frequency band and the set of circularly polarized waves, the third satellite receiving antenna 3 is connected to the newly provided third transmitting / receiving apparatus. In addition, the first transmitting / receiving device 44 includes a converter unit for converting the frequency band of the V1 signal and the H1 signal into a frequency band different from the frequency bands of the IF-V2 signal, the IF-H2 signal, the BS signal, and the 110 / CS signal. An additional arrangement (as a second frequency conversion unit in claim 2) is provided, and a configuration related to the frequency conversion is changed. In this way, the satellite signal, BS signal, and 110 / CS signal of JCSAT-3 and JCSAT4 can be received even in an apartment or the like in which a so-called common reception facility is not originally provided.
(2) The wireless transmission by the first and second transmission / reception devices 44 and 64 is not limited to linear polarization, and may be performed using right-handed or left-handed circularly polarized waves. In this case, the polarization plane adjustment of the first and second re-receiving antennas 72 and 73 becomes unnecessary. Also, it is possible to prevent interference with satellite signals directly incident on the linearly polarized waves from JCSAT-3 and JCSAT-4. Further, even when the wireless transmission signal is reflected on a wall surface of a building or the like, it is possible to prevent signal quality from deteriorating due to transmission. Further, for example, a linearly polarized wave may be used for the first transmitting / receiving device 44 and a circularly polarized wave may be used for the second transmitting / receiving device 64.
[0039]
【The invention's effect】
As described in detail above, according to the first, second, fourth, and fifth aspects of the present invention, the work of installing the system can be simplified and the band of the wireless transmission signal can be narrowed.
[0040]
According to the third aspect of the present invention, even when the installation position and the installation direction of the retransmission antenna are slightly shifted, the half value angle on the retransmission side is wide, so that the reception intensity on the retransmission side can be ensured, and Transmission efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of an embodiment of a satellite signal receiving and transmitting system according to the present invention.
FIG. 2 is a frequency spectrum showing a change in a received signal frequency of FIG. 1, (a) is a transmission signal of BS and CS after terrestrial wave and IF conversion, (b) is JCSAT-3 and The JCSAT-4 satellite signal, (c) shows the IF-converted JCSAT-4 signal, and (d) shows the IF-converted JCSAT-4 signal. The JCSAT-3 signal also shows the IF-converted signal.
FIG. 3 is a block diagram of a first retransmission device of FIG. 1;
FIG. 4 is a block diagram of a second retransmission device in FIG. 1;
FIG. 5 is a block diagram of the re-receiving device of FIG. 1;
FIG. 6 is a block diagram of the signal switch of FIG. 1;
FIG. 7 is a radiation characteristic diagram of the first retransmission antenna of FIG. 1;
FIG. 8 is a radiation characteristic diagram of the first re-receiving antenna of FIG. 1;
[Explanation of symbols]
3rd satellite receiving antenna, 12 first satellite receiving antenna, 13 second satellite receiving antenna, 14 second converter as second frequency conversion means, 20 signal switcher, 27 ··· JCSAT tuner, 34 ··· Output switcher, 44 ··· 1st transmitting / receiving device, 45 ··· 1st retransmitting device, 46 ··· Rereceiving device, 47 ··· 1st LNA, 51 ··· 1st retransmitting Antenna, 64 second transmitter / receiver, 65 second retransmitter, 66 first converter, 67 second LNA, 68 second retransmit antenna, 72 first rereceive antenna , 73... Second re-receiving antenna, 74... Signal switching circuit, 75... RF amplifier section, 76.

Claims (5)

A first satellite receiving antenna for receiving a first satellite signal comprising a set of different polarizations having overlapping frequencies;
A second satellite receiving antenna for receiving a second satellite signal comprising a different set of polarizations also having overlapping frequencies;
First frequency conversion means for converting the frequency of the received first satellite signal to a frequency different from that of the second satellite signal and outputting the converted signal;
A first transmitting / receiving device that wirelessly transmits an output signal of the first frequency conversion means to a receiving side;
A second transmitting / receiving device for wirelessly transmitting an output signal of the second satellite receiving antenna to a receiving side;
Second frequency conversion means for frequency-converting the output signal of the first transmission / reception device and the output signal of the second transmission / reception device transmitted on the receiving side into frequency bands different from each other;
A satellite signal reception / transmission system comprising: A first satellite receiving antenna for receiving a first satellite signal comprising a set of different polarizations having overlapping frequencies;
A second satellite receiving antenna for receiving a second satellite signal comprising a different set of polarizations also having overlapping frequencies;
First frequency conversion means for converting the frequency of the received first satellite signal to a frequency different from that of the second satellite signal and outputting the converted signal;
Second frequency conversion means for converting the frequency of the received second satellite signal to a frequency different from that of the first satellite signal and outputting the converted signal;
A first transmitting / receiving device that wirelessly transmits an output signal of the first frequency conversion means to a receiving side;
A second transmitting / receiving device for wirelessly transmitting an output signal of the second frequency conversion means to a receiving side;
Third frequency conversion means for frequency-converting the output signal of the first transmission / reception device and the output signal of the second transmission / reception device transmitted on the receiving side into frequency bands different from each other;
A satellite signal reception / transmission system comprising: A first transmitting / receiving apparatus, comprising: a first transmitting antenna that wirelessly transmits an output signal of a preceding stage to a receiving side; and a first receiving antenna that receives a wireless transmitting signal of the first transmitting antenna.
The second transmitting / receiving apparatus further includes a second transmitting antenna that wirelessly transmits the output signal of the previous stage to the receiving side, and a second receiving antenna that receives a wireless transmitting signal of the second transmitting antenna,
A half-value angle of at least one main lobe of the first transmission antenna and the second transmission antenna is larger than a half-value angle of main lobes of the first reception antenna and the second reception antenna to be wirelessly transmitted. The satellite signal receiving and transmitting system according to claim 1 or 2, wherein A satellite receiving antenna that receives a satellite signal composed of a set of different polarizations having overlapping frequencies, a radio circuit unit that converts a satellite signal received by the satellite receiving antenna to a different frequency from the received satellite signal and outputs the signal, A satellite signal retransmission device comprising: a retransmission antenna for retransmitting an output signal of the radio circuit unit to a predetermined terrestrial broadcast service area. A satellite receiving antenna receives a first satellite signal having an overlapping frequency and a different set of polarizations, and a second satellite receiving antenna also having an overlapping frequency and a different set of polarizations. A second satellite receiving antenna for receiving the satellite signal of
A first wireless circuit unit that converts the frequency of the first satellite signal received by the first satellite receiving antenna to the second satellite signal so that there is no overlapping portion of the frequency and outputs the first satellite signal; A second wireless circuit unit that outputs a second satellite signal received by the two-satellite receiving antenna at the same frequency as the second satellite signal,
The retransmission antenna comprises: a first retransmission antenna for retransmitting an output signal of the first radio circuit unit; and a second retransmission antenna for retransmitting an output signal of the second radio circuit unit. A satellite signal retransmitting device according to item 1.

Images