CN102664776B - 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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- CN102664776B CN102664776B CN201210119143.5A CN201210119143A CN102664776B CN 102664776 B CN102664776 B CN 102664776B CN 201210119143 A CN201210119143 A CN 201210119143A CN 102664776 B CN102664776 B CN 102664776B
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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 transmissions of mine, tunnel cluster intercom, broadcast, personnel location system.Particularly, a kind of substation, multiband FSK frequency-modulated signal transmission system and method and the network topology structure for it is related to.
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 extend communication distance by the mode of wire transmission signal.
Several signal transmission form below current mine, tunnel cluster intercom, broadcast, the many employings of personnel location system:
The first, leaky cable transmits.The many employings of traditional communication equipment reveal cable as transmission medium, and reveal the double negative wireless signal transmission-receiving function of cable, therefore connect up affected by environment larger, and the signal of long range propagation is easily decayed, need a large amount of repeaters, system group network mode is limited, construction is complicated, expensive.
The wire transmission of the second, CAN, RS485 communication copper cable.Many this transmission systems of employing in personnel location system, but which message transmission rate is low, and apart from short, information capacity is low.
3rd, optical fiber ring network intercommunication, broadcast system.For without under the environment such as looped network condition mine, temporary tunnel construction, the cost of this system is high, and network is complicated.
4th, power amplifier exports, long distance amplifies loudspeaker.This kind of mode is used for comparatively small area, and as square, campus, the terminal quantity of this transmission means is limited.
Therefore, in mine, tunnel cluster intercom, broadcast, personnel location system, a kind of signal transmission system that can solve the problem is needed badly.
Summary of the invention
The present invention aims to provide substation and comprises the signal transmission system of this substation, to overcome the problems of the prior art mentioned above.
According to an aspect of the present invention, provide a kind of substation, it is characterized in that, this substation comprises:
Main control module, for receiving the signal from many frequency modulation modulation module and outside port, processes signal, and sends signal to many frequency modulation modulation module and outside port;
Many frequency modulation modulation module, is connected with described main control module, and described multiband modulation module comprises:
First control unit, for receiving the first digital signal of described main control module, and carries out convolution coding, inverse Fourier transform, data framing and digital filtering to this first digital signal and obtains the second digital signal;
First analog front-end module, be connected with described first control unit, for carrying out frequency-shift keying to the second digital signal from described first control unit, digital-to-analogue conversion, analog filtering, driving obtain the first analog signal, and this first analog signal be sent to outside;
Second analog front-end module, for receiving the second outside analog signal, and this second analog signal is amplified, analog filtering, analog-to-digital conversion and digital demodulation obtain three digital signal; And
Second control unit, be connected with described second analog front-end module, for carrying out noise elimination, Fourier transform, convolutional code decoder to the three digital signal from described second analog front-end module, obtain the 4th digital signal, and send the 4th digital signal;
Wherein, described frequency-shift keying is that multiband 4FSK modulates, and described digital demodulation is multiband 4FSK demodulation.
In a preferred embodiment of substation of the present invention, described digital modulation is that multiband 2nFSK modulates, and described digital demodulation is multiband 2nFSK demodulation, wherein n be greater than 2 integer.
In a preferred embodiment of substation of the present invention, described substation also comprises: radio-frequency (RF) receiving and transmission module, be connected with described main control module, for receiving digital signal from described main control module and outside 433MHz radio audio signals, described digital signal and described 433MHz radio audio signals are amplified, encoding and decoding process, and externally send signal with described main control module.
In a preferred embodiment of substation of the present invention, described substation also comprises: audio coding decoding module, be connected with described main control module, for carrying out audio coding decoding to the digital signal being received from described main control module, digital power amplifies and audio frequency exports.
In a preferred embodiment of substation of the present invention, described substation also comprises: RFID transceiver module, be connected with described main control module, for receiving the 2.4G wireless signal of digital signal from described main control module and supporting wireless electronic tag, encoding and decoding are carried out to described digital signal and described 2.4G wireless signal, and sends signal to described main control module and supporting described wireless electronic tag.
In signal madulation process, the first control unit of described many frequency modulation modulation module and the digital signal of the first analog front-end module to input carry out a series of computing, export some groups and independently encode, many group coding composition Frames.Separate owing to organizing output encoder more, so Information Security is high, antijamming capability is strong.Then carry out multiband FSK modulation to output encoder, total bandwidth is divided into some subbands wide, relative to traditional one-segment FSK modulating mode, multiband FSK modulation adds information transmission density, improves data transmission capacity.
Signal receiving process is the inverse process of signal madulation process.
According to an aspect of the present invention, provide a kind of many frequency-modulated signal transmission system, it is characterized in that, this system comprises above-mentioned the first substation of stating and the second substation, and is connected by the communications cable between described first substation and described second substation;
In the first substation, first main control module carries out process to the first digital signal being received from the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module.
According to an aspect of the present invention, provide a kind of many frequency-modulated signal transmission system, it is characterized in that, this system comprises the first above-mentioned substation and the second substation, and connected by the communications cable between described first substation and described second substation, it is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the first radio-frequency (RF) receiving and transmission module or the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second radio-frequency (RF) receiving and transmission module or the described modulation module of frequency modulation more than second, 433MHz radio audio signals or the second analog signal is obtained after described second radio-frequency (RF) receiving and transmission module or the described modulation module of frequency modulation more than second process described 4th digital signal, and send described 433MHz radio audio signals or the second analog signal.
In a preferred embodiment of many frequency-modulated signal transmission system of the present invention, it is characterized in that, described system comprises the substation of more than three or three.
According to a further aspect in the invention, provide a kind of many frequency-modulated signal transmission system, this system comprises the first above-mentioned substation, the second substation, and is connected by the communications cable between described first substation and the second substation, it is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the first radio-frequency (RF) receiving and transmission module or the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second audio coding decoding module, described second audio coding decoding module is carried out process to described 4th digital signal and is obtained the second analog signal, and audio frequency output is carried out to described second analog signal.
According to an aspect of the present invention, provide a kind of many frequency-modulated signal transmission system, this system comprises above-mentioned substation and supporting wireless electronic tag, it is characterized in that:
RFID transceiver module in described substation sends a 2.4GHz wireless signal;
Described supporting wireless electronic tag receives a 2.4GHz wireless signal, and carries out identification process to it and obtain the 2nd 2.4GHz wireless signal, and sends the 2nd 2.4GHz wireless signal;
RFID transceiver module in described substation receives the 2nd 2.4GHz wireless signal, carry out process and obtain the first digital signal, and this first digital signal is sent to main control module, main control module carries out process to the first digital signal being received from described RFID transceiver module and obtains the second digital signal, and described second digital signal is sent to many frequency modulation modulation module, described many frequency modulation modulation module carries out process from described second digital signal of described main control module obtain the first analog signal to receiving;
Via described first analog signal of communications cable transmission.
In a preferred embodiment of many frequency-modulated signal transmission system of the present invention, it is characterized in that, described system comprises the substation of more than three or three.
In a preferred embodiment of many frequency-modulated signal transmission system of the present invention, it is characterized in that, the mining flame-retardant communications cable of the described communications cable to be model be MHYV1*2*7/0.37, nominal cross is 0.75m
2.
Signal transmission system system of the present invention 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 invention, provide a kind of method for transmitting signals for many frequency-modulated signal transmission system as above, it is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module.
According to an aspect of the present invention, provide a kind of method for transmitting signals for many frequency-modulated signal transmission system as above, it is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the first radio-frequency (RF) receiving and transmission module or the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second radio-frequency (RF) receiving and transmission module or the described modulation module of frequency modulation more than second, 433MHz radio audio signals or the second analog signal is obtained after described second radio-frequency (RF) receiving and transmission module or the described modulation module of frequency modulation more than second process described 4th digital signal, and send described 433MHz radio audio signals or the second analog signal.
According to an aspect of the present invention, provide a kind of method for transmitting signals for many frequency-modulated signal transmission system as above, it is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the first radio-frequency (RF) receiving and transmission module or the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second audio coding decoding module, described second audio coding decoding module is carried out process to described 4th digital signal and is obtained the second analog signal, and audio frequency output is carried out to described second analog signal.
According to an aspect of the present invention, provide a kind of method for transmitting signals for many frequency-modulated signal transmission system as above, it is characterized in that:
RFID transceiver module in described substation sends a 2.4GHz wireless signal;
Described supporting wireless electronic tag receives a 2.4GHz wireless signal, and carries out identification process to it and obtain the 2nd 2.4GHz wireless signal, and sends the 2nd 2.4GHz wireless signal;
RFID transceiver module in described substation receives the 2nd 2.4GHz wireless signal, carry out process and obtain the first digital signal, and this first digital signal is sent to main control module, main control module carries out process to the first digital signal being received from described RFID transceiver module and obtains the second digital signal, and described second digital signal is sent to many frequency modulation modulation module, described many frequency modulation modulation module carries out process from described second digital signal of described main control module obtain the first analog signal to receiving;
Via described first analog signal of communications cable transmission.
In a preferred embodiment of the method for transmitting signals for many frequency-modulated signal transmission system as above of the present invention, it is characterized in that, described system comprises the substation of more than three or three.
In a preferred embodiment of the method for transmitting signals for many frequency-modulated signal transmission system as above of the present invention, it is characterized in that, the mining flame-retardant communications cable of the described communications cable to be model be MHYV1*2*7/0.37, nominal cross is 0.75m
2.
According to an aspect of the present invention, provide the network topology structure for multiband frequency-modulated signal transmission system and method, it is characterized in that, the connection between the substation of described many frequency-modulated signal transmission system can adopt bus-type, star-like or mixed type, and the ultimate range between substation is 10km.
The networking mode of signal transmission system of the present invention is flexible and changeable, efficient, and terminal substation quantity is many, wide coverage.
Accompanying drawing explanation
By hereafter in conjunction with the description of the drawings, will the present invention be easier to understand, 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 of the many frequency modulation modulation module according to 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 is supported; And
Fig. 4 A and Fig. 4 B is the contrast schematic diagram of one-segment FSK and multiband FSK.
Embodiment
The present invention is directed to the practical service environment in mine, tunnel, provide a kind of New Mine, tunnel cluster intercom, broadcast, personnel location system.
Transfer of data in system of the present invention adopts many frequency-modulated signal transmission.Because native system have employed multi-band signal modulation system, so lower to the requirement of transmission medium after processing signal, common communications cable.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 wire transmission distance farthest of this signal cable can reach 10km.Compared to conventional transmission mode, system of the present invention has not by the impact of networking mode, construction environment, and transmission rate high (reaching as high as 100Kbps), information compatibility amount is large, and low price.
Fig. 1 describes the internal frame diagram of substation 101 according to a preferred embodiment of the present invention, and wherein this substation can realize communication, broadcast, personnel positioning three kinds of functions.This substation 101 comprises: main control module 11, comprise master controller 111, outside port, such as universal input/output (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; 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 and audio coding decoding module 12, many frequency modulation modulation module 13, RFID transceiver module 14, radio-frequency (RF) receiving and transmission module 15 are interconnected, and audio coding decoding module 12 and radio-frequency (RF) receiving and transmission module 15 are interconnected.
In substation of the present invention, master controller is used for registration signal, flows to carry out logic control to signal, and is parts known to persons of ordinary skill in the art.
Fig. 2 describes the internal frame diagram of the many frequency modulation modulation module 13 in 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, first control unit 131A comprises the encoder for convolution codes 1311, inverse Fourier transform device (IFFT) 1313, data framer 1315 and digital filter 1316, the second control unit 131B that sequentially connect and comprises the convolutional code decoder device 1312, Fourier transformer (FFT) 1314 and the noise canceller circuit 1317 that sequentially connect; Analog front-end module 132 comprises the first analog front-end module 132A and the second analog front-end module 132B, first analog front-end module 132A comprises 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 and comprises the digital demodulating circuit 1322, analog to digital converter (ADC) 1324, signal amplifier 1327, analog filter 1326, the reception amplifier 1329 that sequentially connect.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, first control unit 131A of many frequency modulation modulation module 13 receives the first digital signal from main control module 111, first described first digital signal carries out convolution coding by encoder for convolution codes 1311, and then coded signal enters inverse Fourier transform device 1313 to perform Fourier transform inverse transformation; Afterwards by data framer 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 second digital signal is admitted to the first analog front-end module 132A, multiband FSK frequency-shift keying is carried out through frequency-shift keying circuit 1321, then digital-to-analogue conversion is carried out through digital to analog converter 1323, enter analog filter 1326 afterwards and carry out filtering, then send into signal drive circuit 1328 and carry out the output of signal drive amplification, obtain the signal be 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 outside, first this second analog signal carries out input stage amplification through reception amplifier 1329, enter analog filter 1326 afterwards and carry out frequency-selective filtering, entering signal amplifier 1327 carries out secondary amplification subsequently, enters ADC 1324 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, first noise canceller circuit 1317 stress release treatment is entered, enter FFT 1314 subsequently to perform Fourier transform, finally enter convolutional code decoder device 1312 and carry out convolutional code decoder, thus obtain useful digital signal, i.e. the 4th digital signal.
In substation of the present invention, 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 etc. adopt and well known to a person skilled in the art that method is carried out.
In the communication process of substation and substation, first radio-frequency (RF) receiving and transmission module 15 of the first substation 101 receives 433MHz radio audio signals, then the radio-frequency power amplifier 152 of this first radio-frequency (RF) receiving and transmission module 15 amplifies this 433MHz radio audio signals, radio frequency encoding and decoding controller 151 carries out convolution coding to the signal after amplification, obtains the first digital signal.Described first digital signal is sent to the first main control module 11 process, obtains 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, first this second digital signal carries out convolution coding by encoder for convolution codes 1311, and then coded signal enters inverse Fourier transform device 1313 to perform Fourier transform inverse transformation; Afterwards by data framer 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, multiband FSK frequency-shift keying is carried out through frequency-shift keying circuit 1321, then digital-to-analogue conversion is carried out through digital to analog converter 1323, enter analog filter 1326 afterwards and carry out filtering, then send into signal drive circuit 1328 and carry out signal drive amplification, obtain the first analog signal, and send described first analog signal.
By common communications cable, (such as, the mining flame-retardant communications cable, model is MHYV1*2*7/0.37 to described first analog signal, and nominal cross is 0.75m
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 ', first this first analog signal carries out input stage amplification through reception amplifier 1329 ', enter analog filter 1326 ' afterwards and carry out frequency-selective filtering, entering signal amplifier 1327 ' carries out secondary amplification subsequently, enter ADC1324 ' and be converted to digital signal, then carry out digital demodulation through digital demodulating circuit 1322 '.This demodulated signal is admitted to control unit 131 ', first noise canceller circuit 1317 ' stress release treatment is entered, enter FFT 1314 ' subsequently to perform Fourier transform, finally enter convolutional code decoder device 1312 ' and carry out convolutional code decoder, thus 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 ' carries out process to this three digital signal and obtains the 4th digital signal, and described 4th digital signal is 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, obtain 433MHz radio audio signals carry out power amplification in the second radio-frequency power amplifier 152 ' after and send.
Said process achieves the communication between the first substation 101 and the second substation 101 '.
Should understand, first main control module 11 of the first substation 101 also can from the modulation module 13 of frequency modulation more than first Received signal strength, after first main control module 11 processes the signal received, again through the modulation module 13 of frequency modulation more than first process after via common communications cable transmission signal to the second substation 101 ', or through first radio-frequency (RF) receiving and transmission module 15 process after send 433MHz radio audio signals.
Should also be understood that the second main control module 11 ' of the second substation 101 ' also can send processing the 4th digital signal obtained into the modulation module of frequency modulation more than second 13 ', then send via common communications cable after the process of the modulation module 13 ' of frequency modulation more than second.
Will 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 ').Second substation 101 ' can from the second radio-frequency (RF) receiving and transmission module 15 ' Received signal strength, and the second radio-frequency (RF) receiving and transmission module 15 ' transmits signals to the second audio coding decoding module 12 ' after processing signal, transmit signals to the second main control module 11 ' more afterwards.
In broadcasting process between substation, first radio-frequency (RF) receiving and transmission module 15 of the first substation 101 receives 433MHz radio audio signals, then the radio-frequency power amplifier 152 of this first radio-frequency (RF) receiving and transmission module 15 amplifies this 433MHz radio audio signals, radio frequency encoding and decoding controller 151 is encoded to the signal after amplification, 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, first the signal of input carries out convolution coding by encoder for convolution codes 1311, and then coded signal enters inverse Fourier transform device 1313 to perform Fourier transform inverse transformation; Afterwards by data framer 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, multiband FSK frequency-shift keying is carried out through frequency-shift keying circuit 1321, then digital-to-analogue conversion is carried out through digital to analog converter 1323, enter analog filter 1326 afterwards and carry out filtering, then send into signal drive circuit 1328 and carry out signal drive amplification, obtain the first analog signal, and send described first analog signal.
By common communications cable, (such as, the mining flame-retardant communications cable, model is MHYV1*2*7/0.37 to described first analog signal, and nominal cross is 0.75m
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 ', first this first analog signal carries out input stage amplification through reception amplifier 1329 ', enter analog filter 1326 ' afterwards and carry out frequency-selective filtering, entering signal amplifier 1327 ' carries out secondary amplification subsequently, enter ADC1324 ' and be converted to digital signal, then carry out digital demodulation through digital demodulating circuit 1322 '.This demodulated signal is admitted to control unit 131 ', first noise canceller circuit 1317 ' stress release treatment is entered, enter FFT 1314 ' subsequently to perform Fourier transform, finally enter convolutional code decoder device 1312 ' and carry out convolutional code decoder, thus 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 processing this three digital signal, and the 4th digital signal is sent into the second audio coding decoding module 12 '.In the second audio coding decoding module 12 ', first 4th digital signal decodes through audio coding decoding controller 121 ', then decoded signal enters digital power amplifier 122 ' and carries out power amplification, obtain the second analog signal, and audio frequency output is carried out to this second analog signal.
The broadcast of the second substation 101 ' that this process implementation carries out via first substation 101.
Should be understood that following process can realize the broadcast of substation 101.
The radio-frequency (RF) receiving and transmission module 15 of substation 101 receives 433MHz radio audio signals, then the radio-frequency power amplifier 152 of this radio-frequency (RF) receiving and transmission module 15 amplifies this 433MHz radio audio signals, and radio frequency encoding and decoding controller 151 is encoded to the signal after amplification.Described encoded signal is sent to main control module 11 process, by main control module 11, the signal after process is sent to audio coding decoding module 12 afterwards.
In audio coding decoding module 12, first the signal of input decodes 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, carries out the 2nd 2.4GHz wireless signal that identification process obtains with this supporting wireless electronic tag information, and send the 2nd 2.4GHz wireless signal to it.
The RFID transceiver module 14 of substation 101 receives the 2nd 2.4GHz wireless signal, decoding process is carried out to it, obtain the first digital signal, and this first digital signal is sent into main control module 11, main control module 11 processes this first digital signal, 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, first this second digital signal carries out convolution coding by encoder for convolution codes 1311, and then coded signal enters inverse Fourier transform device 1313 to perform Fourier transform inverse transformation; Afterwards by data framer 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, multiband FSK frequency-shift keying is carried out through frequency-shift keying circuit 1321, then digital-to-analogue conversion is carried out through digital to analog converter 1323, enter analog filter 1326 afterwards and carry out filtering, then send into signal drive circuit 1328 and carry out signal drive amplification, obtain the first analog signal, and export this first analog signal.
The first analog signal exported is the signal with the wireless electronic tag information supporting with RFID transceiver module 14, and via common communications cable, (such as, the mining flame-retardant communications cable, model is MHYV1*2*7/0.37 to this signal, and nominal cross is 0.75m
2) transmission, thus achieve personnel positioning.
Fig. 3 a, 3b and 3c describe the supported multiple network topological structure of this signal transmission system, as bus-type, star-like, mixed type.
In the bus-network topological structure shown in Fig. 3 a, each substation is joined together by common communications cable.
In the star network topology shown in Fig. 3 b, a substation is as center substation, and other substations are connected to this substation by common communications cable.
In the heterogeneous network topological structure shown in Fig. 3 c, both there is the network topology of the substation be connected on a 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 common communications cable.
Described common communications cable is that such as model is MHYV1*2*7/0.37, nominal cross is 0.75m
2the mining flame-retardant communications cable.
Ultimate range in Fig. 3 a, Fig. 3 b and Fig. 3 c between each substation is 10km.
Fig. 4 has carried out schematically comparing 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 with frequency f 0 for carrier wave, and all information is comprised in one group of output encoder.Once carrier wave is interfered, be then difficult to the integrality ensureing data.
In multiband FSK, the digital information of input is contained in some groups independently in output encoder.Many groups output encoder composition Frame.Because many group output encoders are separate, so Information Security is high, antijamming capability is strong.
In the signal process of transmitting of multiband FSK, transmission total bandwidth is divided into some subbands wide, relative to traditional one-segment FSK pattern, adds information transmission density, improve data capacity.
Due to traditional one-segment FSK carrier wave is become multiband FSK carrier multiplexing, each frequency range has data redundancy backup, error correction transmission function.Namely when interference signal appears in a certain frequency range in multiband, when transfer of data is subject to severe jamming, all the other frequency ranges can be transmitted simultaneously be disturbed data, thus ensure the integrality of data, improve the reliability of system.
Multiband FSK frequency modulation technology has larger bandwidth relative to one-segment FSK technology, and data transfer bandwidth can reach 100Kbps; Stronger antijamming capability, copper cable is medium, and data-signal transmission range reaches more than 10km, can support multiple network structure.
Should be understood that embodiment herein 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 (19)
1. a substation, is characterized in that, this substation comprises:
Main control module, for receiving the signal from many frequency modulation modulation module and outside port, processes signal, and sends signal to many frequency modulation modulation module and outside port;
Many frequency modulation modulation module, is connected with described main control module, and described many frequency modulation modulation module comprises:
First control unit, for receiving the first digital signal of described main control module, and carries out convolution coding, inverse Fourier transform, data framing and digital filtering to this first digital signal and obtains the second digital signal;
First analog front-end module, be connected with described first control unit, for carrying out frequency-shift keying to the second digital signal from described first control unit, digital-to-analogue conversion, analog filtering, driving obtain the first analog signal, and this first analog signal be sent to outside;
Second analog front-end module, for receiving the second outside analog signal, and this second analog signal is amplified, analog filtering, analog-to-digital conversion and digital demodulation obtain three digital signal; And
Second control unit, be connected with described second analog front-end module, for carrying out noise elimination, Fourier transform, convolutional code decoder to the three digital signal from described second analog front-end module, obtain the 4th digital signal, and send the 4th digital signal;
Wherein, described frequency-shift keying is that multiband 4FSK modulates, and described digital demodulation is multiband 4FSK demodulation;
Described substation also comprises: RFID transceiver module, be connected with described main control module, for receiving the 2.4G wireless signal of digital signal from described main control module and supporting wireless electronic tag, encoding and decoding are carried out to described digital signal and described 2.4G wireless signal, and sends signal to described main control module and supporting described wireless electronic tag.
2. substation according to claim 1, it is characterized in that, described substation also comprises: radio-frequency (RF) receiving and transmission module, be connected with described main control module, for receiving digital signal from described main control module and outside 433MHz radio audio signals, described digital signal and described 433MHz radio audio signals are amplified, encoding and decoding process, and externally send signal with described main control module.
3. substation according to claim 1 and 2, it is characterized in that, described substation also comprises: audio coding decoding module, is connected with described main control module, and for carrying out audio coding decoding to the digital signal being received from described main control module, digital power amplifies and audio frequency exports.
4. a substation, is characterized in that, this substation comprises:
Main control module, for receiving the signal from many frequency modulation modulation module and outside port, processes signal, and sends signal to many frequency modulation modulation module and outside port;
Many frequency modulation modulation module, is connected with described main control module, and described many frequency modulation modulation module comprises:
First control unit, for receiving the first digital signal of described main control module, and carries out convolution coding, inverse Fourier transform, data framing and digital filtering to this first digital signal and obtains the second digital signal;
First analog front-end module, be connected with described first control unit, for carrying out frequency-shift keying to the second digital signal from described first control unit, digital-to-analogue conversion, analog filtering, driving obtain the first analog signal, and this first analog signal be sent to outside;
Second analog front-end module, for receiving the second outside analog signal, and this second analog signal is amplified, analog filtering, analog-to-digital conversion and digital demodulation obtain three digital signal; And
Second control unit, be connected with described second analog front-end module, for carrying out noise elimination, Fourier transform, convolutional code decoder to the three digital signal from described second analog front-end module, obtain the 4th digital signal, and send the 4th digital signal;
Wherein, described digital modulation is multiband 2
nfSK modulates, and described digital demodulation is multiband 2
nfSK demodulation, wherein n be greater than 2 integer;
Described substation also comprises: RFID transceiver module, be connected with described main control module, for receiving the 2.4G wireless signal of digital signal from described main control module and supporting wireless electronic tag, encoding and decoding are carried out to described digital signal and described 2.4G wireless signal, and sends signal to described main control module and supporting described wireless electronic tag.
5. the system of frequency-modulated signal transmission more than, is characterized in that, this system comprises two substations according to claim 1: the first substation and the second substation, and is connected by the communications cable between described first substation and described second substation;
In the first substation, first main control module carries out process to the first digital signal being received from the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module.
6. the system of frequency-modulated signal transmission more than, is characterized in that, this system comprises two substations according to claim 2: the first substation and the second substation, and is connected by the communications cable between described first substation and described second substation;
In the first substation, first main control module carries out process to the first digital signal being received from the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second radio-frequency (RF) receiving and transmission module, described second radio-frequency (RF) receiving and transmission module obtains 433MHz radio audio signals after processing described 4th digital signal, and send described 433MHz radio audio signals.
7. the system of frequency-modulated signal transmission more than, is characterized in that, this system comprises two substations according to claim 2: the first substation and the second substation, and is connected by the communications cable between described first substation and described second substation;
In the first substation, first main control module carries out process to the first digital signal being received from the first radio-frequency (RF) receiving and transmission module and obtains the second digital signal, and described second digital signal is sent to the modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the described modulation module of frequency modulation more than second, the described modulation module of frequency modulation more than second obtains the second analog signal after processing described 4th digital signal, and send described second analog signal.
8. frequency-modulated signal transmission system more than a kind, it is characterized in that, this system comprises two substations described in when quoting claim 1 according to claim 3: the first substation and the second substation, and is connected by the communications cable between described first substation and described second substation;
In the first substation, first main control module carries out process to the first digital signal being received from the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second audio coding decoding module, described second audio coding decoding module is carried out process to described 4th digital signal and is obtained the second analog signal, and audio frequency output is carried out to described second analog signal.
9. frequency-modulated signal transmission system more than a kind, it is characterized in that, this system comprises two substations described in when quoting claim 2 according to claim 3: the first substation and the second substation, and is connected by the communications cable between described first substation and described second substation;
In the first substation, first main control module carries out process to the first digital signal being received from the first radio-frequency (RF) receiving and transmission module and obtains the second digital signal, and described second digital signal is sent to the modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second audio coding decoding module, described second audio coding decoding module is carried out process to described 4th digital signal and is obtained the second analog signal, and audio frequency output is carried out to described second analog signal.
10. the system of frequency-modulated signal transmission more than, is characterized in that, this system comprises substation according to claim 1, and first wireless electronic tag supporting with described substation;
RFID transceiver module in described substation sends a 2.4GHz wireless signal;
Described supporting wireless electronic tag receives a 2.4GHz wireless signal, and carries out identification process to it and obtain the 2nd 2.4GHz wireless signal, and sends the 2nd 2.4GHz wireless signal;
RFID transceiver module in described substation receives the 2nd 2.4GHz wireless signal, carry out process and obtain the first digital signal, and this first digital signal is sent to main control module, described main control module carries out process to the first digital signal being received from described RFID transceiver module and obtains the second digital signal, and described second digital signal is sent to many frequency modulation modulation module, described many frequency modulation modulation module carries out process from described second digital signal of described main control module obtain the first analog signal to receiving;
Via described first analog signal of communications cable transmission.
11. many frequency-modulated signal transmission systems according to claim 10, is characterized in that, described system comprises the substation according to claim 1 of more than three or three.
12. according to described many frequency-modulated signal transmission system arbitrary in claim 5-11, it is characterized in that, the described communications cable is model is MHYV1*2*7/0.37, nominal cross is 0.75m
2the mining flame-retardant communications cable.
13. 1 kinds, for the multiband frequency-modulated signal transmission method of many frequency-modulated signal transmission system according to claim 5, is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module.
14. 1 kinds, for the multiband frequency-modulated signal transmission method of many frequency-modulated signal transmission system according to claim 6, is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second radio-frequency (RF) receiving and transmission module, described second radio-frequency (RF) receiving and transmission module obtains 433MHz radio audio signals after processing described 4th digital signal, and send described 433MHz radio audio signals.
15. 1 kinds, for the multiband frequency-modulated signal transmission method of many frequency-modulated signal transmission system according to claim 7, is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the first radio-frequency (RF) receiving and transmission module and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the described modulation module of frequency modulation more than second, the described modulation module of frequency modulation more than second obtains the second analog signal after processing described 4th digital signal, and send described second analog signal.
16. 1 kinds, for the multiband frequency-modulated signal transmission method of many frequency-modulated signal transmission system according to claim 8, is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the modulation module of frequency modulation more than first and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second audio coding decoding module, described second audio coding decoding module is carried out process to described 4th digital signal and is obtained the second analog signal, and audio frequency output is carried out to described second analog signal.
17. 1 kinds, for the multiband frequency-modulated signal transmission method of many frequency-modulated signal transmission system according to claim 9, is characterized in that:
In the first substation, first main control module carries out process to the first digital signal being received from the first radio-frequency (RF) receiving and transmission module and obtains the second digital signal, and described second digital signal is sent to the described modulation module of frequency modulation more than first, the described modulation module of frequency modulation more than first carries out process to the second digital signal being received from described first main control module and obtains the first analog signal, and sends described first analog signal;
Via the communications cable by described first analog signal transmission to the second substation;
In the second substation, the modulation module of frequency modulation more than second carries out process to described first analog signal and obtains three digital signal, and described three digital signal is sent to the second main control module, described second main control module carries out process to the three digital signal being received from the described modulation module of frequency modulation more than second and obtains the 4th digital signal, and described 4th digital signal is sent to the second audio coding decoding module, described second audio coding decoding module is carried out process to described 4th digital signal and is obtained the second analog signal, and audio frequency output is carried out to described second analog signal.
18. 1 kinds, for the multiband frequency-modulated signal transmission method of many frequency-modulated signal transmission system according to claim 10, is characterized in that:
RFID transceiver module in described substation sends a 2.4GHz wireless signal;
Described supporting wireless electronic tag receives a 2.4GHz wireless signal, and carries out identification process to it and obtain the 2nd 2.4GHz wireless signal, and sends the 2nd 2.4GHz wireless signal;
RFID transceiver module in described substation receives the 2nd 2.4GHz wireless signal, carry out process and obtain the first digital signal, and this first digital signal is sent to main control module, described main control module carries out process to the first digital signal being received from described RFID transceiver module and obtains the second digital signal, and described second digital signal is sent to many frequency modulation modulation module, described many frequency modulation modulation module carries out process from described second digital signal of described main control module obtain the first analog signal to receiving;
Via described first analog signal of communications cable transmission.
19. for according to described many frequency-modulated signal transmission system arbitrary in claim 5-12 or for for the network topology structure according to the multiband frequency-modulated signal transmission method described in arbitrary in claim 13-18, it is characterized in that, the substation supporting bus type of described many frequency-modulated signal transmission system, star-like or mixed type connection, and the ultimate range between substation is 10km.
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| CN201230315Y (en) * | 2008-05-28 | 2009-04-29 | 北京人和路通科技有限公司 | Radio equipment applied for railway same frequency multiuser communication |
| CN201733304U (en) * | 2010-04-21 | 2011-02-02 | 哈尔滨天智网络通信工程有限公司 | Digitalized narrow routing radio relay station |
| CN102142852A (en) * | 2011-03-12 | 2011-08-03 | 桂林市思奇通信设备有限公司 | Method and equipment for transmitting digital-analog audio broadcasting |
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