CN202737891U - Substation, signal transmission system and network topology structure - Google Patents
Substation, signal transmission system and network topology structure Download PDFInfo
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- CN202737891U CN202737891U CN 201220172247 CN201220172247U CN202737891U CN 202737891 U CN202737891 U CN 202737891U CN 201220172247 CN201220172247 CN 201220172247 CN 201220172247 U CN201220172247 U CN 201220172247U CN 202737891 U CN202737891 U CN 202737891U
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Abstract
The utility model provides a substation, a multiple frequency band signal transmission system the substation, and a network topology structure thereof. The system uses a common communication cable as media, and transmits the signal through the communication substation using the multiple frequency band FSK frequency modulated signal. The signal transmission system is simple in system and low in construction technology and cost; the single stage transmission distance is long, the data transmission capacity is large; the network way is flexible, variable and high efficient, the number of the terminal substation is large and the covering range is wide.
Description
Technical field
The utility model relates to mine, the tunnel transmits with the signal of cluster intercom, broadcasting, personnel location system.Particularly, the network topology structure that relates to a kind of substation, multiband fsk signal transmission system and be used for it.
Background technology
Mine, tunnel electromagnetic environment complex, electromagnetic wave is serious at space transmission loss, and wireless communication distance is short, and radio communication must prolong communication distance by the mode of wire transmission signal.
Mine, tunnel adopt following several signal transmission forms with cluster intercom, broadcasting, personnel location system more at present:
The first, the leaky cable transmission.Traditional communication equipment adopts more reveals cable as transmission medium, and reveals the double negative wireless signal transmission-receiving function of cable, and it is affected by environment larger therefore to connect up, and the signal of long Distance Transmission is easily decayed, and needs a large amount of repeaters, and the system group network mode is limited, construction is complicated, and is expensive.
The wire transmission of the second, CAN, RS485 communication copper cable.Many these transmission systems of employing in personnel location system, but this mode message transmission rate is low, distance is short, and information capacity is low.
The 3rd, optical fiber ring network intercommunication, broadcast system.For without under the environment such as looped network condition mine, interim constructing tunnel, the cost of this system is high, and network is complicated.
The 4th, power amplifier output, long apart from amplifying loudspeaker.This kind mode is multiplex in than small area, and such as square, campus, the terminal quantity of this transmission means is limited.
Therefore, need a kind of signal transmission system that can address the above problem in mine, tunnel badly in cluster intercom, broadcasting, personnel location system.
The utility model content
The signal transmission system that the utility model aims to provide substation and comprises this substation is to overcome the problems of the prior art mentioned above.
According to an aspect of the present utility model, a kind of substation is provided, it is characterized in that this substation comprises:
Main control module comprises master controller and outside port;
Many frequency modulation modulation module is connected with described main control module, and described multiband modulation module comprises:
The first control unit comprises the encoder for convolution codes, inverse Fourier transform device, data framing device and the digital filter that sequentially connect;
The first analog front-end module is connected with described the first control unit, comprises the frequency-shift keying circuit, digital to analog converter, analog filter and the signal drive circuit that sequentially connect;
The second analog front-end module comprises the digital demodulating circuit, analog to digital converter, signal amplifier, analog filter, the reception amplifier that sequentially connect; And
The second control unit is connected with described the second analog front-end module, comprises the noise canceller circuit, Fourier transformer and the convolutional code decoder device that sequentially connect;
Wherein, described frequency-shift keying circuit is multiband 4FSK modulation circuit, and described digital demodulating circuit is multiband 4FSK demodulator circuit.
In a preferred embodiment of substation of the present utility model, described Digital Modulation is multiband 2nFSK modulation, and described digital demodulation is multiband 2nFSK demodulation, and wherein n is the integer greater than 2.
In a preferred embodiment of substation of the present utility model, described substation also comprises: radio-frequency (RF) receiving and transmission module is connected with described main control module, and comprises radio frequency encoding and decoding controller and the radio-frequency power amplifier that sequentially connects.
In a preferred embodiment of substation of the present utility model, described substation also comprises: the audio coding decoding module is connected with described main control module, and comprises audio codec and the digital power amplifier that sequentially connects.
In a preferred embodiment of substation of the present utility model, described substation also comprises: the RFID transceiver module, be connected with described main control module, and comprise sequentially connect comprise personnel positioning controller and 2.4GHz wireless signal transceiver.
The signal demodulating process is the inverse process of signal modulated process.
In the signal modulated process, the first control unit of described many frequency modulation modulation module and the first analog front-end module are carried out a series of computings to the digital signal of input, export some groups and independently encode, and many group codings form Frame.Because many group output encoders are separate, so Information Security is high, antijamming capability is strong.Then output encoder is carried out multiband FSK modulation, it is wide that total bandwidth is divided into some subbands, and with respect to traditional one-segment FSK modulating mode, multiband FSK modulation has increased communication density, has improved data transmission capacity.
According to an aspect of the present utility model, a kind of many frequency-modulated signal transmission system is provided, it is characterized in that this system comprises the first above-mentioned substation and the second substation, and connect by the communications cable between described the first substation and described the second substation.
According to an aspect of the present utility model, a kind of many frequency-modulated signal transmission system is provided, it is characterized in that this system comprises above-mentioned substation, and with supporting the first wireless electronic tag of described substation.
In a preferred embodiment of many frequency-modulated signal transmission of the present utility model system, it is characterized in that described system comprises the substation more than three or three.
In a preferred embodiment of many frequency-modulated signal transmission of the present utility model system, it is characterized in that the described communications cable is that model is the mining flame-retardant communications cable of MHYV1*2*7/0.37, nominal cross is 0.75m
2
Signal transmission system of the present utility model system is simple, antijamming capability is strong, information capacity is large, transmission rate is high, long transmission distance, cost are low.
According to an aspect of the present utility model, the network topology structure that is used for many frequency-modulated signal transmission system is provided, it is characterized in that the connection between the substation of described many frequency-modulated signal transmission system can be adopted bus-type, star-like or mixed type, and the ultimate range between the substation is 10km.
The networking mode of signal transmission system of the present utility model is flexible and changeable, efficient, many, the wide coverage of terminal substation quantity.
Description of drawings
In conjunction with the description of the drawings, will be more readily understood the utility model by hereinafter, in the accompanying drawings:
Fig. 1 is the built-in function block diagram according to the substation of a preferred embodiment of the present utility model;
Fig. 2 is the functional block diagram according to many frequency modulation modulation module of an example embodiment;
Fig. 3 A, Fig. 3 B and Fig. 3 C are the example network topology structures that system of the present utility model supports; And
Fig. 4 A and Fig. 4 B are the contrast schematic diagrames of one-segment FSK and multiband FSK.
Embodiment
The utility model provides a kind of New Mine, tunnel cluster intercom, broadcasting, personnel location system for the practical service environment in mine, the tunnel.
Transfer of data in the system of the present utility model adopts many frequency-modulated signal transmission.Because native system adopted the multi-band signal modulation system, so lower to the requirement of transmission medium after signal processed, the common communications cable gets final product.Preferably, described common communications cable is the mining flame-retardant communications cable, and model is MHYV1*2*7/0.37, and nominal cross is 0.75mm
2, the farthest wire transmission distance of this signal cable can reach 10km.Than the conventional transmission mode, system of the present utility model has the impact that is not subjected to networking mode, construction environment, and transmission rate high (reaching as high as 100Kbps), information compatibility are measured large, and low price.
Fig. 1 has described the internal frame diagram according to the substation 101 of a preferred embodiment of the present utility model, and wherein this substation can be realized communication, broadcasting, three kinds of functions of personnel positioning.This substation 101 comprises: main control module 11, comprise master controller 111, outside port, and connect 115 etc. such as universal input/output (GPIO) 112, I2C bus (Inter-Integrted Circuit) 113, UART114, serial peripheral; Audio coding decoding module 12 comprises audio codec 121, digital power amplifier 122; Many frequency modulation modulation module 13 comprises control unit 131, analog front-end module (AFE) 132; RFID transceiver module 14 comprises personnel positioning controller 141,2.4GHz wireless signal transceiver 142; Radio-frequency (RF) receiving and transmission module 15 comprises radio frequency encoding and decoding controller 151, radio-frequency power amplifier 152.Main control module 11 interconnects with audio coding decoding module 12, many frequency modulation modulation module 13, RFID transceiver module 14, radio-frequency (RF) receiving and transmission module 15, and audio coding decoding module 12 interconnects with radio-frequency (RF) receiving and transmission module 15.
In substation of the present invention, master controller is used for depositing signal, signal is flowed to carry out logic control, and is parts known to persons of ordinary skill in the art.
Fig. 2 has described the internal frame diagram of the many frequency modulation modulation module 13 in the substation 101.In this many frequency modulation modulation module 13, control unit 131 comprises the first control unit 131A and the second control unit 131B, the first control unit 131A comprises that the encoder for convolution codes 1311, inverse Fourier transform device (IFFT) 1313, data framing device 1315 and digital filter 1316, the second control unit 131B that sequentially connect comprise convolutional code decoder device 1312, Fourier transformer (FFT) 1314 and the noise canceller circuit 1317 that sequentially connects; Analog front-end module 132 comprises the first analog front-end module 132A and the second analog front-end module 132B, the first analog front-end module 132A comprises that the frequency-shift keying circuit 1321, digital to analog converter (DAC) 1323, analog filter 1326, signal drive circuit 1328, the second analog front-end module 132B that sequentially connect comprise digital demodulating circuit 1322, analog to digital converter (ADC) 1324, signal amplifier 1327, analog filter 1326, the reception amplifier 1329 that sequentially connects.In many frequency modulation modulation module 13, the first control unit 131A is connected with the first analog front-end module 132A, and the second analog front-end module 132B is connected with the second control unit 132B.
On the one hand, the first control unit 131A of many frequency modulation modulation module 13 receives the first digital signal from main control module 111, described the first digital signal is at first carried out convolution coding by encoder for convolution codes 1311, and then coded signal enters inverse Fourier transform device 1313 to carry out the Fourier transform inverse transformation; Pass through afterwards data framing device 1315 for this signal adds data frame structure, then enter digital filter 1316 and carry out digital filtering, obtain the signal of filtering, i.e. the second digital signal; Described the second digital signal is admitted to the first analog front-end module 132A, carry out multiband FSK frequency-shift keying through frequency-shift keying circuit 1321, then carry out digital-to-analogue conversion through digital to analog converter 1323, enter afterwards analog filter 1326 and carry out filtering, then send into signal drive circuit 1328 and carry out signal driver amplification output, the signal that obtains being exaggerated, i.e. the first analog signal.
On the other hand, the second analog front-end module 132B in many frequency modulation modulation module 13 receives the second analog signal from the outside, at first this second analog signal is carried out the input stage amplification through reception amplifier 1329, enter afterwards analog filter 1326 and carry out frequency-selective filtering, entering signal amplifier 1327 carries out the secondary amplification subsequently, enters ADC1324 and is converted to digital signal, then carries out digital demodulation through digital demodulating circuit 1322, obtain demodulated digital signal, i.e. three digital signal.This three digital signal is admitted to the second control unit 131B, at first enter noise canceller circuit 1317 and eliminate noise, enter subsequently FFT1314 to carry out Fourier transform, enter at last convolutional code decoder device 1312 and carry out convolutional code decoder, thereby obtain useful digital signal, i.e. the 4th digital signal.
In substation of the present utility model, the employings such as the convolution coding in many frequency modulation modulation module, inverse Fourier transform, data framing, digital filtering, digital-to-analogue conversion, analog filtering, driving, amplification, analog-to-digital conversion, noise elimination, Fourier transform, convolutional code decoder well known to a person skilled in the art that method carries out.
In the communication process of substation and substation, the first radio-frequency (RF) receiving and transmission module 15 of the first substation 101 receives 433MHz wireless speech signal, then 152 pairs of these 433MHz wireless speech signals of radio-frequency power amplifier of this first radio-frequency (RF) receiving and transmission module 15 amplify, signal after 151 pairs of amplifications of radio frequency encoding and decoding controller carries out convolution coding, obtains the first digital signal.Described the first digital signal is sent to the first main control module 11 processes, obtain the second digital signal, by this first main control module 11 this second digital signal is sent to the modulation module of frequency modulation more than first 13 afterwards.
In the modulation module of frequency modulation more than first 13, this second digital signal is at first carried out convolution coding by encoder for convolution codes 1311, and then coded signal enters inverse Fourier transform device 1313 to carry out the Fourier transform inverse transformation; Pass through afterwards data framing device 1315 for this signal adds data frame structure, then enter digital filter 1316 and carry out digital filtering; The signal of filtering is admitted to analog front-end module 132, carry out multiband FSK frequency-shift keying through frequency-shift keying circuit 1321, then carry out digital-to-analogue conversion through digital to analog converter 1323, enter afterwards analog filter 1326 and carry out filtering, then send into signal drive circuit 1328 and carry out the signal driver amplification, obtain the first analog signal, and send described the first analog signal.
(such as, the mining flame-retardant communications cable, model is MHYV1*2*7/0.37 to described the first analog signal, and nominal cross is 0.75m by the common communications cable
2) be sent to the second substation 101 '.
The modulation module of frequency modulation more than second 13 ' of the second substation 101 ' receives this first analog signal.In the modulation module of frequency modulation more than second 13 ' of the second substation 101 ', at first this first analog signal is carried out the input stage amplification through reception amplifier 1329 ', enter afterwards analog filter 1326 ' and carry out frequency-selective filtering, entering signal amplifier 1327 ' carries out the secondary amplification subsequently, enter ADC1324 ' and be converted to digital signal, then pass through digital demodulating circuit 1322 ' and carry out digital demodulation.This demodulated signal is admitted to control unit 131 ', at first enter noise canceller circuit 1317 ' and eliminate noise, enter subsequently FFT1314 ' to carry out Fourier transform, enter at last convolutional code decoder device 1312 ' and carry out convolutional code decoder, thereby obtain useful digital signal, i.e. three digital signal.
This three digital signal is admitted to the second main control module 11 ' of the second substation 101 ', this second main control module 11 ' is processed this three digital signal and is obtained the 4th digital signal, and described the 4th digital signal sent into the second radio-frequency (RF) receiving and transmission module 15 ', in the second radio frequency encoding and decoding controller 151 ', carry out convolution coding, in the second radio-frequency power amplifier 152 ', carry out obtaining 433MHz wireless speech signal after the power amplification and sending.
Said process has been realized the communication between the first substation 101 and the second substation 101 '.
Should understand, the first main control module 11 of the first substation 101 also can receive signal from the modulation module of frequency modulation more than first 13, after the signal of 11 pairs of receptions of the first main control module is processed, again after the modulation module of frequency modulation more than first 13 is processed via common communications cable transmission signal to the second substation 101 ', perhaps process through the first radio-frequency (RF) receiving and transmission module 15 and send 433MHz wireless speech signal afterwards.
Should also be understood that the 4th digital signal that the second main control module 11 ' of the second substation 101 ' also can obtain processing sends into the modulation module of frequency modulation more than second 13 ', after the modulation module of frequency modulation more than second 13 ' is processed, send via the common communications cable again.
Should also be understood that in the first substation 101 (the second substation 101 ') the first radio-frequency (RF) receiving and transmission module 15 (the second radio-frequency (RF) receiving and transmission module 15 ') can be connected with the first audio coding decoding module 12 (the second audio coding decoding module 12 ').The second substation 101 ' can receive signal from the second radio-frequency (RF) receiving and transmission module 15 ', transmits signals to the second audio coding decoding module 12 ' after the second radio-frequency (RF) receiving and transmission module 15 ' is processed signal, transmits signals to afterwards the second main control module 11 ' again.
In the broadcasting process between substation, the first radio-frequency (RF) receiving and transmission module 15 of the first substation 101 receives 433MHz wireless speech signal, then 152 pairs of these 433MHz wireless speech signals of radio-frequency power amplifier of this first radio-frequency (RF) receiving and transmission module 15 amplify, signal after 151 pairs of amplifications of radio frequency encoding and decoding controller is encoded, and obtains the first digital signal.This first digital signal is sent into the first main control module 11 process, obtain the second digital signal, by this first main control module 11 this second digital signal is sent to the modulation module of frequency modulation more than first 13 afterwards.
In the modulation module of frequency modulation more than first 13, the signal of input at first carries out convolution coding by encoder for convolution codes 1311, and then coded signal enters inverse Fourier transform device 1313 to carry out the Fourier transform inverse transformation; Pass through afterwards data framing device 1315 for this signal adds data frame structure, then enter digital filter 1316 and carry out digital filtering; The signal of filtering is admitted to analog front-end module 132, carry out multiband FSK frequency-shift keying through frequency-shift keying circuit 1321, then carry out digital-to-analogue conversion through digital to analog converter 1323, enter afterwards analog filter 1326 and carry out filtering, then send into signal drive circuit 1328 and carry out the signal driver amplification, obtain the first analog signal, and send described the first analog signal.
(such as, the mining flame-retardant communications cable, model is MHYV1*2*7/0.37 to described the first analog signal, and nominal cross is 0.75m by the common communications cable
2) be sent to the second substation 101 '.
The modulation module of frequency modulation more than second 13 ' of the second substation 101 ' receives this first analog signal.In the modulation module of frequency modulation more than second 13 ' of the second substation 101 ', at first this first analog signal is carried out the input stage amplification through reception amplifier 1329 ', enter afterwards analog filter 1326 ' and carry out frequency-selective filtering, entering signal amplifier 1327 ' carries out the secondary amplification subsequently, enter ADC1324 ' and be converted to digital signal, then pass through digital demodulating circuit 1322 ' and carry out digital demodulation.This demodulated signal is admitted to control unit 131 ', at first enter noise canceller circuit 1317 ' and eliminate noise, enter subsequently FFT1314 ' to carry out Fourier transform, enter at last convolutional code decoder device 1312 ' and carry out convolutional code decoder, thereby obtain useful digital signal, i.e. three digital signal.
This three digital signal is admitted to the second main control module 11 ', and this second main control module 11 ' obtains the 4th digital signal after this three digital signal is processed, and the 4th digital signal is sent into the second audio coding decoding module 12 '.In the second audio coding decoding module 12 ', the 4th digital signal is at first passed through audio coding decoding controller 121 ' and is decoded, then decoded signal enters digital power amplifier 122 ' and carries out power amplification, obtain the second analog signal, and this second analog signal is carried out audio frequency output.
This process implementation the broadcasting of the second substation 101 ' of carrying out via the first substation 101.
Should be understood that following process can realize the broadcasting of substation 101.
The radio-frequency (RF) receiving and transmission module 15 of substation 101 receives 433MHz wireless speech signal, then 152 pairs of these 433MHz wireless speech signals of radio-frequency power amplifier of this radio-frequency (RF) receiving and transmission module 15 amplify, and the signal after 151 pairs of amplifications of radio frequency encoding and decoding controller is encoded.Described signal of having encoded is sent to main control module 11 processes, the signal after will being processed by main control module 11 afterwards is sent to audio coding decoding module 12.
In audio coding decoding module 12, the signal of input is at first decoded through audio coding decoding controller 121, and then decoded signal enters digital power amplifier 122 and carries out power amplification.Then by loudspeaker this signal is exported.
In the personnel location system of substation, the RFID transceiver module 14 of substation 101 sends a 2.4GHz wireless signal A.
Described supporting wireless electronic tag receives a 2.4GHz wireless signal, it is carried out identification process obtain the 2nd 2.4GHz wireless signal with this supporting wireless electronic tag information, and send the 2nd 2.4GHz wireless signal.
The RFID transceiver module 14 of substation 101 receives the 2nd 2.4GHz wireless signal, to its processing of decoding, obtain the first digital signal, and this first digital signal sent into main control module 11,11 pairs of these the first digital signals of main control module are processed, obtain the second digital signal, and this second digital signal is sent to many frequency modulation modulation module 13.
In many frequency modulation modulation module 13, this second digital signal is at first carried out convolution coding by encoder for convolution codes 1311, and then coded signal enters inverse Fourier transform device 1313 to carry out the Fourier transform inverse transformation; Pass through afterwards data framing device 1315 for this signal adds data frame structure, then enter digital filter 1316 and carry out digital filtering; The signal of filtering is admitted to analog front-end module 132, carry out multiband FSK frequency-shift keying through frequency-shift keying circuit 1321, then carry out digital-to-analogue conversion through digital to analog converter 1323, enter afterwards analog filter 1326 and carry out filtering, then send into signal drive circuit 1328 and carry out the signal driver amplification, obtain the first analog signal, and export this first analog signal.
The first analog signal of output be with the signal of the supporting wireless electronic tag information of RFID transceiver module 14, (such as, the mining flame-retardant communications cable, model is MHYV1*2*7/0.37 to this signal, and nominal cross is 0.75m via the common communications cable
2) transmission, thereby realized personnel positioning.
Fig. 3 a, 3b and 3c have described the supported multiple network topological structure of this signal transmission system, such as bus-type, star-like, mixed type.
In the bus-network topological structure shown in Fig. 3 a, each substation is joined together by the common communications cable.
In the hub-and-spoke network topology structure shown in Fig. 3 b, a substation is as the center substation, and other substations are connected to this substation by the common communications cable.
In the heterogeneous network topological structure shown in Fig. 3 c, both there had been the network topology that is connected to a substation on the common communications cable, also there is substation centered by a substation, all the other substations are connected to the network topology of this substation by the common communications cable.
Described common communications cable is for being that MHYV1*2*7/0.37, nominal cross are 0.75m such as model
2The mining flame-retardant communications cable.
Ultimate range among Fig. 3 a, Fig. 3 b and Fig. 3 c between each substation is 10km.
Fig. 4 has carried out schematic comparison to multiband FSK of the present utility model and one-segment FSK of the prior art.
In one-segment FSK, the digital information of input is take frequency f 0 as carrier wave, and all information is comprised in one group of output encoder.In case carrier wave is interfered, then be difficult to guarantee the integrality of data.
In multiband FSK, the digital information of input is contained in some groups independently in the output encoder.Many group output encoders form Frame.Because to organize output encoder separate more, so Information Security is high, antijamming capability is strong.
In the signal process of transmitting of multiband FSK, will transmitting total bandwidth, to be divided into some subbands wide, and the one-segment FSK pattern with respect to traditional has increased communication density, has improved data capacity.
Because traditional one-segment FSK carrier wave is become multiband FSK carrier multiplexing, each frequency range has data redundancy backup, error correction transfer function.Namely interference signal appears in a certain frequency range in multiband, and when transfer of data was subject to severe jamming, all the other frequency ranges can be transmitted simultaneously and be disturbed data, thereby guarantees the integrality of data, has improved the reliability of system.
Multiband FSK frequency modulation technology has larger bandwidth with respect to one-segment FSK technology, and data transfer bandwidth can reach 100Kbps; Stronger antijamming capability, copper cable are medium, and the data-signal transmission range reaches more than the 10km, can support the multiple network structure.
Should be understood that herein embodiment and embodiment only for illustrative purposes, those skilled in the art can make many variants, and scope of the present utility model is defined by the claims.
Claims (12)
1. a substation is characterized in that, this substation comprises:
Main control module comprises master controller and outside port;
Many frequency modulation modulation module is connected with described main control module, and described multiband modulation module comprises:
The first control unit comprises the encoder for convolution codes, inverse Fourier transform device, data framing device and the digital filter that sequentially connect;
The first analog front-end module is connected with described the first control unit, comprises the frequency-shift keying circuit, digital to analog converter, analog filter and the signal drive circuit that sequentially connect;
The second analog front-end module comprises the digital demodulating circuit, analog to digital converter, signal amplifier, analog filter, the reception amplifier that sequentially connect; And
The second control unit is connected with described the second analog front-end module, comprises the noise canceller circuit, Fourier transformer and the convolutional code decoder device that sequentially connect;
Wherein, described frequency-shift keying circuit is multiband 4FSK modulation circuit, and described digital demodulating circuit is multiband 4FSK demodulator circuit.
2. substation according to claim 1 is characterized in that, described substation also comprises: radio-frequency (RF) receiving and transmission module is connected with described main control module, and comprises radio frequency encoding and decoding controller and the radio-frequency power amplifier that sequentially connects.
3. substation according to claim 1 and 2 is characterized in that, described substation also comprises: the audio coding decoding module is connected with described main control module, and comprises audio codec and the digital power amplifier that sequentially connects.
4. substation according to claim 1 and 2 is characterized in that, described substation also comprises: the RFID transceiver module, be connected with described main control module, and comprise sequentially connect comprise personnel positioning controller and 2.4GHz wireless signal transceiver.
5. substation according to claim 1 is characterized in that, described Digital Modulation is multiband 2
nThe FSK modulation, described digital demodulation is multiband 2
nThe FSK demodulation, wherein n is the integer greater than 2.
6. frequency-modulated signal transmission system more than a kind is characterized in that, this system comprises the first substation according to claim 1 and the second substation, and connects by the communications cable between described the first substation and described the second substation.
7. frequency-modulated signal transmission system more than a kind is characterized in that, this system comprises the first substation according to claim 2 and the second substation, and connects by the communications cable between described the first substation and described the second substation.
8. frequency-modulated signal transmission system more than a kind is characterized in that, this system comprises the first substation according to claim 3 and the second substation, and connects by the communications cable between described the first substation and described the second substation.
9. frequency-modulated signal transmission system more than a kind is characterized in that, this system comprises substation according to claim 4, and with supporting the first wireless electronic tag of described substation.
10. arbitrary described many frequency-modulated signal transmission system is characterized in that described system comprises the substation more than three or three according to claim 6-9.
11. arbitrary described many frequency-modulated signal transmission system is characterized in that the described communications cable is that model is that MHYV1*2*7/0.37, nominal cross are 0.75m according to claim 6-9
2The mining flame-retardant communications cable.
12. be used for according to claim 6-11 network topology structure of arbitrary described many frequency-modulated signal transmission system, it is characterized in that, connection between the substation of described many frequency-modulated signal transmission system can be adopted bus-type, star-like or mixed type, and the ultimate range between the substation is 10km.
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| CN 201220172247 CN202737891U (en) | 2012-04-20 | 2012-04-20 | Substation, signal transmission system and network topology structure |
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| CN 201220172247 CN202737891U (en) | 2012-04-20 | 2012-04-20 | Substation, signal transmission system and network topology structure |
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