CN102664776A - Substation, signal transmission system and method, and network topology thereof - Google Patents
Substation, signal transmission system and method, and network topology thereof Download PDFInfo
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- CN102664776A CN102664776A CN2012101191435A CN201210119143A CN102664776A CN 102664776 A CN102664776 A CN 102664776A CN 2012101191435 A CN2012101191435 A CN 2012101191435A CN 201210119143 A CN201210119143 A CN 201210119143A CN 102664776 A CN102664776 A CN 102664776A
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Abstract
The invention provides a substation, a multi-band signal transmission system and a method including the substation and a network topology thereof. The system uses common communication cables as media, and transmits data through communication substations. The data is transmitted through multi-band frequency-shift keying (FSK) frequency modulated signals. The signal transmission system has the advantage that the system and construction are simple, the cost is low, single-stage transmitting distance is long, data transmission capacity is large, networking modes are flexible and efficient, and terminal substations have a large quantity and a wide coverage area.
Description
Technical field
The present invention relates to the signal transmission of mine, tunnel with cluster intercom, broadcasting, personnel location system.Particularly, the network topology structure that relates to a kind of substation, multiband FSK frequency-modulated signal transmission system and method and be used for it.
Background technology
Mine, tunnel electromagnetic environment situation complicacy, loss is serious in the space for electromagnetic wave, and wireless communication distance is short, and radio communication must prolong communication distance through the mode of wire transmission signal.
Several kinds of signal transmission forms below mine, tunnel adopt 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 bigger therefore to connect up; And the signal of long Distance Transmission is prone to decay, needs a large amount of repeaters, and the system group network mode is limited; Construction is complicated, costs an arm and a leg.
The second, CAN, the wire transmission of 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.Under environment such as no 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 used for than small area more, and like 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.
Summary of the invention
The signal transmission system that the present invention 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 invention, a kind of substation is provided, has it is characterized in that, this substation comprises:
The master control module is used to receive the signal from many frequency modulation modulation module and outside port, signal is handled, and sent signal to many frequency modulation modulation module and outside port;
Many frequency modulation modulation module is connected with said master control module, and said multiband modulation module comprises:
First control unit is used to receive first digital signal of said master control module, and this first digital signal is carried out convolution coding, inverse Fourier transform, data framing and digital filtering obtains second digital signal;
First analog front-end module; Be connected with said first control unit; Be used for obtaining first analog signal, and this first analog signal being sent to the outside to carry out frequency-shift keying, digital-to-analogue conversion, analog filtering, driving from second digital signal of said first control unit;
Second analog front-end module is used to receive the second outside analog signal, and to this second analog signal amplify, analog filtering, analog-to-digital conversion and digital demodulation obtain three digital signal; And
Second control unit; Be connected with said second analog front-end module; Be used for the three digital signal from said second analog front-end module is carried out noise removing, Fourier transform, convolutional code decoder, obtain the 4th digital signal, and send the 4th digital signal;
Wherein, said frequency-shift keying is multiband 4FSK modulation, and said digital demodulation is multiband 4FSK demodulation.
In a preferred embodiment of substation of the present invention, said digital modulation is multiband 2nFSK modulation, and said digital demodulation is multiband 2nFSK demodulation, and wherein n is the integer greater than 2.
In a preferred embodiment of substation of the present invention; Said substation also comprises: RF receiving and transmission module; Be connected with said master control module; Be used to receive digital signal and outside 433MHz wireless speech signal from said master control module, to said digital signal and said 433MHz wireless speech signal amplify, encoding and decoding handle, and to outside and said master control module transmission signal.
In a preferred embodiment of substation of the present invention; Said substation also comprises: the audio coding decoding module; Be connected with said master control module, be used for the digital signal that is received from said master control module is carried out audio coding decoding, digital power amplification and audio frequency output.
In a preferred embodiment of substation of the present invention; Said substation also comprises: the RFID transceiver module; Be connected with said master control module; Be used to receive 2.4G wireless signal, said digital signal and said 2.4G wireless signal carried out encoding and decoding, and send signal to said master control module and supporting said wireless electronic tag from the digital signal of said master control module and supporting wireless electronic tag.
In the signal modulated process, first control unit of said many frequency modulation modulation module and 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 are formed 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, total bandwidth is divided into the plurality of sub bandwidth, with respect to traditional one-segment FSK modulating mode, multiband FSK modulation has increased message transmission density, has improved data transmission capacity.
The signal demodulating process is the inverse process of signal modulated process.
According to an aspect of the present invention, a kind of many frequency-modulated signal transmission system is provided, it is characterized in that this system comprises above-mentioned first substation of stating and second substation, and connect through the communications cable between said first substation and said second substation;
In first substation; The first master control module is handled first digital signal that is received from the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation, the modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal, and said three digital signal is sent to the second master control module.
According to an aspect of the present invention; A kind of many frequency-modulated signal transmission system is provided, has it is characterized in that this system comprises the first above-mentioned substation and second substation; And connect through the communications cable between said first substation and said second substation, it is characterized in that:
In first substation; The first master control module is handled first digital signal that is received from first RF receiving and transmission module or the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation; The modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal; And said three digital signal is sent to the second master control module; The said second master control module is handled the three digital signal that is received from the said modulation module of frequency modulation more than second and is obtained the 4th digital signal; And said the 4th digital signal is sent to second RF receiving and transmission module or the said modulation module of frequency modulation more than second; Obtain the 433MHz wireless speech signal or second analog signal after said second RF receiving and transmission module or the said modulation module of frequency modulation more than second are handled said the 4th digital signal, and send the said 433MHz wireless speech signal or second analog signal.
In a preferred embodiment of many frequency-modulated signal transmission of the present invention system, it is characterized in that said system comprises the substation more than three or three.
According to a further aspect in the invention, a kind of many frequency-modulated signal transmission system is provided, this system comprises the first above-mentioned substation, second substation, and connects through the communications cable between said first substation and second substation, it is characterized in that:
In first substation; The first master control module is handled first digital signal that is received from first RF receiving and transmission module or the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation; The modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal; And said three digital signal is sent to the second master control module; The said second master control module is handled the three digital signal that is received from the said modulation module of frequency modulation more than second and is obtained the 4th digital signal; And said the 4th digital signal is sent to the second audio coding decoding module, the said second audio coding decoding module is handled said the 4th digital signal and is obtained second analog signal, and said second analog signal is carried out audio frequency output.
According to an aspect of the present invention, a kind of many frequency-modulated signal transmission system is provided, this system comprises above-mentioned substation and supporting wireless electronic tag, it is characterized in that:
RFID transceiver module in the said substation sends a 2.4GHz wireless signal;
Said supporting wireless electronic tag receives a 2.4GHz wireless signal, and it is carried out identification process obtains the 2nd 2.4GHz wireless signal, and sends the 2nd 2.4GHz wireless signal;
RFID transceiver module in the said substation receives the 2nd 2.4GHz wireless signal; Handle and obtain first digital signal; And this first digital signal is sent to the master control module; The master control module is handled first digital signal that is received from said RFID transceiver module and is obtained second digital signal; And said second digital signal is sent to many frequency modulation modulation module, said many frequency modulation modulation module obtains first analog signal to receiving to handle from said second digital signal of said master control module;
Transmit said first analog signal via the communications cable.
In a preferred embodiment of many frequency-modulated signal transmission of the present invention system, it is characterized in that said system comprises the substation more than three or three.
In a preferred embodiment of many frequency-modulated signal transmission of the present invention system, it is characterized in that the said 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 invention system is simple, antijamming capability is strong, information capacity is big, transmission rate is high, long transmission distance, cost are low.
According to an aspect of the present invention, a kind of method for transmitting signals that is used for aforesaid many frequency-modulated signal transmission system is provided, has it is characterized in that:
In first substation; The first master control module is handled first digital signal that is received from the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation, the modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal, and said three digital signal is sent to the second master control module.
According to an aspect of the present invention, a kind of method for transmitting signals that is used for aforesaid many frequency-modulated signal transmission system is provided, has it is characterized in that:
In first substation; The first master control module is handled first digital signal that is received from first RF receiving and transmission module or the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation; The modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal; And said three digital signal is sent to the second master control module; The said second master control module is handled the three digital signal that is received from the said modulation module of frequency modulation more than second and is obtained the 4th digital signal; And said the 4th digital signal is sent to second RF receiving and transmission module or the said modulation module of frequency modulation more than second; Obtain the 433MHz wireless speech signal or second analog signal after said second RF receiving and transmission module or the said modulation module of frequency modulation more than second are handled said the 4th digital signal, and send the said 433MHz wireless speech signal or second analog signal.
According to an aspect of the present invention, a kind of method for transmitting signals that is used for aforesaid many frequency-modulated signal transmission system is provided, has it is characterized in that:
In first substation; The first master control module is handled first digital signal that is received from first RF receiving and transmission module or the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation; The modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal; And said three digital signal is sent to the second master control module; The said second master control module is handled the three digital signal that is received from the said modulation module of frequency modulation more than second and is obtained the 4th digital signal; And said the 4th digital signal is sent to the second audio coding decoding module, the said second audio coding decoding module is handled said the 4th digital signal and is obtained second analog signal, and said second analog signal is carried out audio frequency output.
According to an aspect of the present invention, a kind of method for transmitting signals that is used for aforesaid many frequency-modulated signal transmission system is provided, has it is characterized in that:
RFID transceiver module in the said substation sends a 2.4GHz wireless signal;
Said supporting wireless electronic tag receives a 2.4GHz wireless signal, and it is carried out identification process obtains the 2nd 2.4GHz wireless signal, and sends the 2nd 2.4GHz wireless signal;
RFID transceiver module in the said substation receives the 2nd 2.4GHz wireless signal; Handle and obtain first digital signal; And this first digital signal is sent to the master control module; The master control module is handled first digital signal that is received from said RFID transceiver module and is obtained second digital signal; And said second digital signal is sent to many frequency modulation modulation module, said many frequency modulation modulation module obtains first analog signal to receiving to handle from said second digital signal of said master control module;
Transmit said first analog signal via the communications cable.
In a preferred embodiment that is used for the method for transmitting signals of aforesaid many frequency-modulated signal transmission system of the present invention, it is characterized in that said system comprises the substation more than three or three.
In a preferred embodiment that is used for the method for transmitting signals of aforesaid many frequency-modulated signal transmission system of the present invention, it is characterized in that the said communications cable is that model is the mining flame-retardant communications cable of MHYV1*2*7/0.37, nominal cross is 0.75m
2
According to an aspect of the present invention; The network topology structure that is used for multiband frequency-modulated signal transmission system and method is provided; It is characterized in that the connection between the substation of said 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 invention is flexible and changeable, efficient, many, the wide coverage of terminal substation quantity.
Description of drawings
Combine explanation through hereinafter, will be more readily understood the present invention accompanying drawing, in the accompanying drawings:
Fig. 1 is the built-in function block diagram of substation according to a preferred embodiment of the present invention;
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 invention supports; And
Fig. 4 A and Fig. 4 B are the contrast sketch mapes of one-segment FSK and multiband FSK.
Embodiment
The present invention is directed to the actual environment for use in mine, the tunnel, provide a kind of novel mine, tunnel with cluster intercom, broadcasting, personnel location system.
Transfer of data in the system of the present invention adopts many frequency-modulated signal transmission.Because native system adopted the multi-band signal modulation system, so it is lower to the requirement of transmission medium that signal is handled the back, the common communications cable gets final product.Preferably, said 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 distance of wire transmission farthest of this signal cable can reach 10km.Than the conventional transmission mode, system of the present invention has the influence that does not receive networking mode, construction environment, and transmission rate high (reaching as high as 100Kbps), information compatibility are measured big, and low price.
Fig. 1 has described the internal frame diagram of substation 101 according to a preferred embodiment of the present invention, and wherein this substation can be realized communication, broadcasting, three kinds of functions of personnel positioning.This substation 101 comprises: master control module 11 comprises master controller 111, outside port, such as general I/O (GPIO) 112, I2C bus (Inter-Integrted Circuit) 113, UART114, Serial Peripheral Interface (SPI) 115 etc.; 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; RF receiving and transmission module 15 comprises radio frequency encoding and decoding controller 151, radio-frequency power amplifier 152.Master control module 11 interconnects with audio coding decoding module 12, many frequency modulation modulation module 13, RFID transceiver module 14, RF receiving and transmission module 15, and audio coding decoding module 12 interconnects with RF receiving and transmission module 15.
In substation of the present invention, master controller is used to deposit signal, to signal flow to carrying out logic control, and be the known parts of those of ordinary skills.
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 connect in regular turn comprise convolutional code decoder device 1312, the Fourier transformer (FFT) 1314 and noise canceller circuit 1317 that connects in regular turn; 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 connect in regular turn comprise digital demodulating circuit 1322, analog to digital converter (ADC) 1324, signal amplifier 1327, analog filter 1326, the reception amplifier 1329 that connects in regular turn.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 first digital signal of Autonomous Control module 111; Said first digital signal is at first carried out convolution coding through encoder for convolution codes 1311, and coded signal gets into inverse Fourier transform device 1313 to carry out the Fourier transform inverse transformation then; Pass through data framing device 1315 afterwards for this signal adds data frame structure, get into digital filter 1316 then and carry out digital filtering, obtain the signal of filtering, i.e. second digital signal; Said 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; Carry out digital-to-analogue conversion through digital to analog converter 1323 then, get into analog filter 1326 afterwards and carry out filtering, send into signal drive circuit 1328 then and carry out signal driving amplification output; The signal that obtains being exaggerated, i.e. first analog signal.
On the other hand, the second analog front-end module 132B in many frequency modulation modulation module 13 receives second analog signal from the outside, and at first this second analog signal is carried out the input stage amplification through reception amplifier 1329; Get into analog filter 1326 afterwards and carry out frequency-selective filtering; Entering signal amplifier 1327 carries out the secondary amplification subsequently, gets into ADC 1324 and converts digital signal into, carries out digital demodulation through digital demodulating circuit 1322 then; Obtain demodulated digital signal, i.e. three digital signal.This three digital signal is admitted to the second control unit 131B; At first get into noise canceller circuit 1317 and eliminate noise; Get into FFT 1314 subsequently to carry out Fourier transform; Get into convolutional code decoder device 1312 at last and carry out convolutional code decoder, thereby obtain useful digital signal, be i.e. the 4th digital signal.
In substation of the present invention, 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 removing, 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; First RF receiving and transmission module 15 of first substation 101 receives 433MHz wireless speech signal; 152 pairs of these 433MHz wireless speech signals of radio-frequency power amplifier of this first RF receiving and transmission module 15 amplify then; Signal after 151 pairs of amplifications of radio frequency encoding and decoding controller carries out convolution coding, obtains first digital signal.Said first digital signal is sent to the first master control module 11 handles, obtain second digital signal, by this first master 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 through encoder for convolution codes 1311, and coded signal gets into inverse Fourier transform device 1313 to carry out the Fourier transform inverse transformation then; Pass through data framing device 1315 afterwards for this signal adds data frame structure, get into digital filter 1316 then 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; Carry out digital-to-analogue conversion through digital to analog converter 1323 then, get into analog filter 1326 afterwards and carry out filtering, send into signal drive circuit 1328 then and carry out signal driving amplification; Obtain first analog signal, and send said first analog signal.
(such as, the mining flame-retardant communications cable, model is MHYV1*2*7/0.37 to said first analog signal, and nominal cross is 0.75m through the common communications cable
2) be sent to second substation 101 '.
The modulation module of frequency modulation more than second 13 ' of second substation 101 ' receives this first analog signal.In the modulation module of frequency modulation more than second 13 ' of second substation 101 '; At first this first analog signal is carried out the input stage amplification through reception amplifier 1329 '; Get into analog filter 1326 ' afterwards and carry out frequency-selective filtering; Entering signal amplifier 1327 ' carries out the secondary amplification subsequently, gets into ADC1324 ' and converts digital signal into, passes through digital demodulating circuit 1322 ' then and carries out digital demodulation.This demodulated signal is admitted to control unit 131 '; At first get into noise canceller circuit 1317 ' and eliminate noise; Get into FFT 1314 ' subsequently to carry out Fourier transform; Get into convolutional code decoder device 1312 ' at last 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 master control module 11 ' of second substation 101 '; This second master control module 11 ' is handled this three digital signal and is obtained the 4th digital signal; And said the 4th digital signal sent into second RF receiving and transmission module 15 '; In the second radio frequency encoding and decoding controller 151 ', carry out convolution coding, in 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 first substation 101 and second substation 101 '.
Should understand; The first master control module 11 of 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 master control module is handled; Handle afterwards via common communications cable transmission signal to the second substation 101 ', perhaps through sending 433MHz wireless speech signal after 15 processing of first RF receiving and transmission module through the modulation module of frequency modulation more than first 13 again.
The second master control module 11 ' that should also be understood that second substation 101 ' also can be sent the 4th digital signal that processing obtains into the modulation module of frequency modulation more than second 13 ', after the modulation module of frequency modulation more than second 13 ' is handled, sends via the common communications cable again.
Should also be understood that in first substation 101 (second substation 101 ') first RF receiving and transmission module 15 (second RF receiving and transmission module 15 ') can be connected with the first audio coding decoding module 12 (the second audio coding decoding module 12 ').Second substation 101 ' can receive signal from second RF receiving and transmission module 15 ', transmits signals to the second audio coding decoding module 12 ' after second RF receiving and transmission module 15 ' is handled signal, transmits signals to the second master control module 11 ' afterwards again.
In the broadcasting process between substation; First RF receiving and transmission module 15 of first substation 101 receives 433MHz wireless speech signal; 152 pairs of these 433MHz wireless speech signals of radio-frequency power amplifier of this first RF receiving and transmission module 15 amplify then; Signal after 151 pairs of amplifications of radio frequency encoding and decoding controller is encoded, and obtains first digital signal.This first digital signal is sent into the first master control module 11 handle, obtain second digital signal, by this first master 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 through encoder for convolution codes 1311, and coded signal gets into inverse Fourier transform device 1313 to carry out the Fourier transform inverse transformation then; Pass through data framing device 1315 afterwards for this signal adds data frame structure, get into digital filter 1316 then 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; Carry out digital-to-analogue conversion through digital to analog converter 1323 then, get into analog filter 1326 afterwards and carry out filtering, send into signal drive circuit 1328 then and carry out signal driving amplification; Obtain first analog signal, and send said first analog signal.
(such as, the mining flame-retardant communications cable, model is MHYV1*2*7/0.37 to said first analog signal, and nominal cross is 0.75m through the common communications cable
2) be sent to second substation 101 '.
The modulation module of frequency modulation more than second 13 ' of second substation 101 ' receives this first analog signal.In the modulation module of frequency modulation more than second 13 ' of second substation 101 '; At first this first analog signal is carried out the input stage amplification through reception amplifier 1329 '; Get into analog filter 1326 ' afterwards and carry out frequency-selective filtering; Entering signal amplifier 1327 ' carries out the secondary amplification subsequently, gets into ADC1324 ' and converts digital signal into, passes through digital demodulating circuit 1322 ' then and carries out digital demodulation.This demodulated signal is admitted to control unit 131 '; At first get into noise canceller circuit 1317 ' and eliminate noise; Get into FFT 1314 ' subsequently to carry out Fourier transform; Get into convolutional code decoder device 1312 ' at last 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 master control module 11 ', and this second master control module 11 ' obtains the 4th digital signal after this three digital signal is handled, 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; Decoded signal entering digital power amplifier 122 ' carries out power amplification then; Obtain second analog signal, and this second analog signal is carried out audio frequency output.
The broadcasting of second substation 101 ' that this process has realized carrying out via first substation 101.
Should be understood that following process can realize the broadcasting of substation 101.
The RF receiving and transmission module 15 of substation 101 receives 433MHz wireless speech signal; 152 pairs of these 433MHz wireless speech signals of radio-frequency power amplifier of this RF receiving and transmission module 15 amplify then, and the signal after 151 pairs of amplifications of radio frequency encoding and decoding controller is encoded.Said encoded signals is sent to master control module 11 handles, the signal after will being handled by master 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 decoded signal entering digital power amplifier 122 carries out power amplification then.Through loudspeaker this signal is exported then.
In the personnel location system of substation, the RFID transceiver module 14 of substation 101 sends a 2.4GHz wireless signal A.
Said supporting wireless electronic tag receives a 2.4GHz wireless signal, it is carried out the 2nd 2.4GHz wireless signal that identification process obtains having 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; It is carried out decoding processing; Obtain first digital signal, and this first digital signal is sent into master control module 11,11 pairs of these first digital signals of master control module are handled; Obtain 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 through encoder for convolution codes 1311, and coded signal gets into inverse Fourier transform device 1313 to carry out the Fourier transform inverse transformation then; Pass through data framing device 1315 afterwards for this signal adds data frame structure, get into digital filter 1316 then 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; Carry out digital-to-analogue conversion through digital to analog converter 1323 then, get into analog filter 1326 afterwards and carry out filtering, send into signal drive circuit 1328 then and carry out signal driving amplification; Obtain first analog signal, and export this first analog signal.
First analog signal of output is the signal that has with the supporting wireless electronic tag information of RFID transceiver module 14, and (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, like bus-type, star-like, mixed type.
In the bus-network topological structure shown in Fig. 3 a, each substation is joined together through 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 through 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 a substation on the common communications cable, also existing with a substation is the center substation, all the other substations are connected to the network topology of this substation through the common communications cable.
Said 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 invention and one-segment FSK of the prior art.
In one-segment FSK, the digital information of input is carrier wave with frequency f 0, 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 are formed 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 transmit total bandwidth and be divided into the plurality of sub bandwidth, the one-segment FSK pattern with respect to traditional has increased message transmission 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.Promptly interference signal appears in a certain frequency range in the multiband, and when transfer of data received serious interferences, all the other frequency ranges can be transmitted simultaneously and receive interfering data, thereby the integrality of assurance data has improved the reliability of system.
Multiband FSK frequency modulation technology has bigger 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 distance reaches more than the 10km, can support the multiple network structure.
Should be understood that among this paper embodiment and embodiment only for illustrative purposes, those skilled in the art can make many variants, and scope of the present invention is defined by the claims.
Claims (10)
1. a substation is characterized in that, this substation comprises:
The master control module is used to receive the signal from many frequency modulation modulation module and outside port, signal is handled, and sent signal to many frequency modulation modulation module and outside port;
Many frequency modulation modulation module is connected with said master control module, and said multiband modulation module comprises:
First control unit is used to receive first digital signal of said master control module, and this first digital signal is carried out convolution coding, inverse Fourier transform, data framing and digital filtering obtains second digital signal;
First analog front-end module; Be connected with said first control unit; Be used for obtaining first analog signal, and this first analog signal being sent to the outside to carry out frequency-shift keying, digital-to-analogue conversion, analog filtering, driving from second digital signal of said first control unit;
Second analog front-end module is used to receive the second outside analog signal, and to this second analog signal amplify, analog filtering, analog-to-digital conversion and digital demodulation obtain three digital signal; And
Second control unit; Be connected with said second analog front-end module; Be used for the three digital signal from said second analog front-end module is carried out noise removing, Fourier transform, convolutional code decoder, obtain the 4th digital signal, and send the 4th digital signal;
Wherein, said frequency-shift keying is multiband 4FSK modulation, and said digital demodulation is multiband 4FSK demodulation.
2. substation according to claim 1; It is characterized in that; Said substation also comprises: RF receiving and transmission module, be connected with said master control module, and be used to receive digital signal and outside 433MHz wireless speech signal from said master control module; To said digital signal and said 433MHz wireless speech signal amplify, encoding and decoding handle, and to outside and said master control module transmission signal.
3. substation according to claim 1 and 2; It is characterized in that; Said substation also comprises: the audio coding decoding module, be connected with said master control module, and be used for the digital signal that is received from said master control module is carried out audio coding decoding, digital power amplification and audio frequency output.
4. substation according to claim 1 and 2; It is characterized in that; Said substation also comprises: the RFID transceiver module, be connected with said master control module, and be used to receive 2.4G wireless signal from the digital signal of said master control module and supporting wireless electronic tag; Said digital signal and said 2.4G wireless signal are carried out encoding and decoding, and send signal to said master control module and supporting said wireless electronic tag.
5. frequency-modulated signal transmission system more than a kind is characterized in that, this system comprises first substation according to claim 1 and second substation, and connects through the communications cable between said first substation and said second substation;
In first substation; The first master control module is handled first digital signal that is received from the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation, the modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal, and said three digital signal is sent to the second master control module.
6. frequency-modulated signal transmission system more than a kind is characterized in that, this system comprises described first substation and second substation when quoting claim 1 according to claim 3, and connects through the communications cable between said first substation and said second substation;
In first substation; The first master control module is handled first digital signal that is received from the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation; The modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal; And said three digital signal is sent to the second master control module; The said second master control module is handled the three digital signal that is received from the said modulation module of frequency modulation more than second and is obtained the 4th digital signal; And said the 4th digital signal is sent to the second audio coding decoding module, the said second audio coding decoding module is handled said the 4th digital signal and is obtained second analog signal, and said second analog signal is carried out audio frequency output.
7. frequency-modulated signal transmission system more than a kind is characterized in that, this system comprises substation according to claim 4, and with the first supporting wireless electronic tag of said substation;
RFID transceiver module in the said substation sends a 2.4GHz wireless signal;
Said supporting wireless electronic tag receives a 2.4GHz wireless signal, and it is carried out identification process obtains the 2nd 2.4GHz wireless signal, and sends the 2nd 2.4GHz wireless signal;
RFID transceiver module in the said substation receives the 2nd 2.4GHz wireless signal; Handle and obtain first digital signal; And this first digital signal is sent to the master control module; Said master control module is handled first digital signal that is received from said RFID transceiver module and is obtained second digital signal; And said second digital signal is sent to many frequency modulation modulation module, said many frequency modulation modulation module obtains first analog signal to receiving to handle from said second digital signal of said master control module;
Transmit said first analog signal via the communications cable.
8. multiband frequency-modulated signal transmission method that is used for the described many frequency-modulated signal transmission of claim 5 system is characterized in that:
In first substation; The first master control module is handled first digital signal that is received from the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation, the modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal, and said three digital signal is sent to the second master control module.
9. multiband frequency-modulated signal transmission method that is used for the described many frequency-modulated signal transmission of claim 6 system is characterized in that:
In first substation; The first master control module is handled first digital signal that is received from the modulation module of frequency modulation more than first and is obtained second digital signal; And said second digital signal is sent to the said modulation module of frequency modulation more than first; The said modulation module of frequency modulation more than first is handled second digital signal that is received from the said first master control module and is obtained first analog signal, and sends said first analog signal;
Via the communications cable with said first analog signal transmission to the second substation;
In second substation; The modulation module of frequency modulation more than second is handled said first analog signal and is obtained three digital signal; And said three digital signal is sent to the second master control module; The said second master control module is handled the three digital signal that is received from the said modulation module of frequency modulation more than second and is obtained the 4th digital signal; And said the 4th digital signal is sent to the second audio coding decoding module, the said second audio coding decoding module is handled said the 4th digital signal and is obtained second analog signal, and said second analog signal is carried out audio frequency output.
10. multiband frequency-modulated signal transmission method that is used for the described many frequency-modulated signal transmission of claim 7 system is characterized in that:
RFID transceiver module in the said substation sends a 2.4GHz wireless signal;
Said supporting wireless electronic tag receives a 2.4GHz wireless signal, and it is carried out identification process obtains the 2nd 2.4GHz wireless signal, and sends the 2nd 2.4GHz wireless signal;
RFID transceiver module in the said substation receives the 2nd 2.4GHz wireless signal; Handle and obtain first digital signal; And this first digital signal is sent to the master control module; Said master control module is handled first digital signal that is received from said RFID transceiver module and is obtained second digital signal; And said second digital signal is sent to many frequency modulation modulation module, said many frequency modulation modulation module obtains first analog signal to receiving to handle from said second digital signal of said master control module;
Transmit said first analog signal via the communications cable.
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