CN115296734A - Intelligent health diagnosis radio frequency optical fiber switching multiplexing transmission system, method and device - Google Patents
Intelligent health diagnosis radio frequency optical fiber switching multiplexing transmission system, method and device Download PDFInfo
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0793—Network aspects, e.g. central monitoring of transmission parameters
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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Abstract
The invention provides an intelligent health diagnosis radio frequency optical fiber switching multiplexing transmitting system, which comprises an optical modulation module, a receiving module and a transmitting module, wherein the optical modulation module modulates light waves matched with the characteristics of input radio frequency signals and outputs the modulated light waves; the optical demodulation module reduces the optical signal into an inlet end radio frequency signal; the wavelength division multiplexing module converges the optical signals and transmits the converged optical signals to the optical demodulation module, and the optical demodulation module reduces the optical signals into radio frequency signals and sends the radio frequency signals to the rear end; the automatic power control module controls and compensates through a peripheral circuit according to the acquisition and analysis of the parameters; the automatic temperature control module samples and analyzes the ambient temperature to perform reverse compensation, so that the temperature is controlled. The invention realizes high fidelity restoration of radio frequency signals, has anti-misoperation measures and improves the fault tolerance of the system.
Description
Technical Field
The invention relates to the technical field of communication devices, in particular to an intelligent health diagnosis radio frequency optical fiber switching multiplexing transmission system, method and device.
Background
After the satellite is arranged with the transmitting tower, the satellite and the test room form allopatric deployment in a command hall, long-distance communication is needed, meanwhile, the reliability requirement on a communication system is extremely high, whether the communication is normal or not in the transmitting process directly influences the transmitting time, the command and the password of the satellite, and whether the normal transmission of the communication is normal or not is telemetered to directly relate to the success or failure of a satellite transmitting task. Therefore, a communication system needs to be designed with high reliability, and meanwhile, as the emission base has more tasks and has high requirements on the optical cables, the transmission of the equidirectional signals on one optical cable is realized by the wavelength division multiplexing technology, so that the requirement on the number of the optical cables is greatly reduced. At present, the radio frequency optical fiber forwarding device mainly has the following defects:
(1) The radio frequency optical fiber forwarding system adopts radio frequency transmission links in one-to-one correspondence with the optical cables, the number of the optical cables limits the number of communication paths, and simultaneously limits the number of backup optical cables, thereby reducing redundancy and reliability;
(2) The method for automatically diagnosing the health of the whole system and tracking the signal quality for a long time is lacked, and the performance reduction of the system cannot be quantitatively evaluated;
(3) The signal jump event under the long-term working state is easy to lose due to the lack of automatic capture and recording of the signal jump;
(4) The heartbeat monitoring on the communication link is lacked, the state of the communication link cannot be judged, and no automatic switching means is provided for unexpected situations;
(5) There is a lack of feedback control of the light source voltage, current of the communication link and a lack of negative supplementary control of the temperature of the light source.
Through retrieval, patent document CN204836178U discloses a radio frequency amplification component and an optical fiber transmission system for wireless intercom emergency communication, wherein the optical fiber transmission radio frequency amplification component comprises a transceiver module, a coupling module, an amplification processing module and a photoelectric conversion module; the optical fiber transmission system comprises a coupler, a near-end machine with a first optical fiber transmission radio frequency amplification component and a far-end machine with a second optical fiber transmission radio frequency amplification component, and is used for amplifying and outputting signals input to the far-end machine. In order to realize the wireless intercommunication between the near-end and the far-end, the prior art realizes signal enhancement by coupling radio frequency signals into electric signals and by an amplifier and realizes signal transmission by using a photoelectric module. But the method does not relate to matching adjustment of the inlet radio frequency signals, multiplexing of optical wave signals, monitoring and automatic switching of optical fiber links and long-term health diagnosis of transmission signal links.
Patent document CN208063212U discloses a receiving end of a radio frequency optical fiber communication system based on a voltage controlled optical attenuator, where an optical receiver is equipped with an optical detector, and a voltage controlled optical attenuator is added in front of the optical receiver. The optical signal reaching the optical receiver is mainly and directly output as a receiving signal, a small part of the optical signal is sent to the optical detector, the electric signal obtained by conversion is accessed to a computer through an analog-to-digital converter, and the attenuation control quantity signal of the computer is accessed to the voltage-controlled optical attenuator through the digital-to-analog converter. The computer detects the current output current of the optical detector to obtain the current received optical power, compares the current received optical power with the stored set value of the output power of the optical detector to obtain the attenuation control quantity of the voltage-controlled optical attenuator, and sends the attenuation control quantity to the voltage-controlled optical attenuator through the digital-to-analog converter to adjust the optical attenuation quantity in real time. The voltage-controlled optical attenuator in the prior art is installed at a receiving end of a radio frequency optical fiber communication system, an optical transmitter sends an optical signal, the optical signal is transmitted to an optical receiver through an optical cable, but the matching adjustment of an inlet radio frequency signal is not involved, the multiplexing of an optical wave signal is not involved, the monitoring and automatic switching of an optical fiber link are not involved, and the long-term health diagnosis of a transmission signal link is not involved.
Patent document CN105450307A discloses a radio frequency amplifying circuit and an optical receiver for an optical fiber radio frequency communication network, which includes a radio frequency input terminal IN, a radio frequency output terminal OUT, an amplifier, a power supply, a signal splitter C, a radio frequency monitor, and a controller MCU, wherein the radio frequency input terminal IN, the amplifier, and the radio frequency output terminal OUT are connected IN sequence, the power supply is connected to the amplifier to provide power to the amplifier, the signal splitter C is connected to the output terminal of the amplifier to split the output signal amplified by the amplifier into two paths, the main path is connected to the radio frequency input terminal OUT, the secondary path is connected to the radio frequency monitor, the radio frequency monitor is connected to the controller MCU, and the controller MCU is further connected to the power supply control terminal. This prior art is used to adjust the supply voltage output according to the rf signal strength detected by the rf monitor; the method does not relate to matching adjustment of an inlet radio frequency signal, multiplexing of an optical wave signal, monitoring and automatic switching of an optical fiber link, and long-term health diagnosis of a transmission signal link.
The patent document CN101389148B discloses an uplink and downlink system of a radio frequency optical fiber transmission system and a method for providing an optical carrier for uplink, wherein an optical carrier filter is provided in a downlink structure. A double-sideband signal with an optical carrier is generated in a central station through a Mach-Zehnder modulator, and the optical carrier is suppressed through an optical carrier filter, so that the modulation degree of the signal is improved. While the uplink is provided with an optical carrier using an optical signal generated by SBS at 11GHz below the input optical carrier frequency. The prior art simultaneously uses the optical signal generated by the SBS and lower than the input optical carrier frequency by 11GHz to provide the optical carrier for the uplink; the method does not relate to matching adjustment of an inlet radio frequency signal, multiplexing of an optical wave signal, monitoring and automatic switching of an optical fiber link, and long-term health diagnosis of a transmission signal link.
Therefore, it is highly desirable to develop a highly reliable apparatus and method for transmitting rf fiber for intelligent health diagnosis in long-distance wireless communication.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an intelligent health diagnosis radio frequency optical fiber multiplexing transmission system, a method and a device, which improve the reliability and the self-adaptability of a satellite transmitting base to long-distance wireless communication and prevent the occurrence of abnormal communication caused by the performance degradation of the system.
The invention provides an intelligent health diagnosis radio frequency optical fiber multiplexing and transmitting system, which comprises:
the light modulation module: modulating the input radio frequency signal to a light wave with matched ITU-T standard wavelength according to the frequency band characteristics of the input radio frequency signal and outputting the light wave to perform electro-optical signal conversion;
a light demodulation module: restoring the optical signal into an inlet end radio frequency signal according to the characteristics of the inlet end signal;
a wavelength division multiplexing module: converging the optical signals modulated by the optical modulation module together or transmitting the composite optical signals on the optical cables to the optical modulation module, so that the composite optical signals can be transmitted on the same optical cable, and the optical modulation module receives the transmitted optical signals and reduces the optical signals into radio frequency signals to be sent to the rear end;
an automatic power control module: according to the collection of working voltage and current of a laser, an optical modulator and a demodulator, the voltage and the current of a working module are compensated through a differential-integral-circuit;
an automatic temperature control module: sampling and analyzing the ambient temperature of the laser and the light modulation and demodulation module, and performing reverse compensation according to the change of the temperature to realize the control of the temperature;
the radio frequency matching gain control module: the impedance matching of a radio frequency input medium is completed, the amplitude of a signal is adjusted, and local adjustment and instruction adjustment of a receiving master control center are supported;
a signal measurement module: measuring the signals in real time, and feeding back the measured data to a master control center;
the master control center: the information processing center of the system processes the information transmitted by each link, analyzes the measurement result and issues an action instruction according to judgment conditions such as a threshold value and the like.
Preferably, the rf matching gain control module splits the small signal for analyzing the signal while receiving the rf signal, performs front-end control on the signal amplitude and the like in the rf band, and transmits the rf signal to the optical modulation module after the signal amplitude adjustment is completed.
Preferably, the signal measurement module carries out detection measurement on the signal while transmitting the signal, and sends the measurement result to the master control center through the network, and the master control center analyzes the current state index, gives a performance change value by combining with the historical index, and predicts the service life of the system;
the master control center: the quality of the signal is measured by a network control instrument, the measurement result is analyzed and processed, fault and health diagnosis is automatically carried out, the front section receives the adjustment of the rear end signal sending gain, and the link is switched, receives and executes a manual intervention instruction.
Preferably, the system needs to monitor the signal for a long time, including signal indexes of the power change trend, the frequency drift trend and the frequency spectrum change trend of the signal, analyze the trend, classify and give out a quantitative value of the trend change according to index elements, perform health assessment on the system, automatically switch channels and report the state when the signal deterioration is lower than an early warning value.
Preferably, the signal measurement module is used for completing capturing, analyzing and processing of the instantaneous mutation signal by the master control center, wherein the instantaneous mutation signal comprises signal mutation time, mutation parameters and mutation quantity, the system setting action is combined to autonomously judge the cause of the signal mutation, and if the mutation quantity is greater than an early warning value, the communication link is autonomously switched.
Preferably, the heartbeat monitoring of the whole link system is completed through the signal measuring module and the master control center, the signal quality is evaluated at corresponding intervals, all communication links are polled, and channels are switched autonomously according to evaluation results.
Preferably, according to different radio frequency bands, the signals are modulated onto light waves with different wavelengths, and the minimum distance of the interval is the interference between the signals without focal modulation and the like; the modulated light waves with different wavelengths are converged to a wavelength division multiplexing module, and the wavelength division multiplexing modules arranged at two ends of different places realize the transmission of all signals through one optical fiber.
Preferably, the optical demodulation module demodulates the wavelength division multiplexed compliant signal, reduces the radio frequency signal, and transmits the radio frequency signal to a corresponding channel, thereby completing the whole process of converting the radio frequency signal to the optical signal and then to the radio frequency signal.
The invention provides an intelligent health diagnosis radio frequency optical fiber switching and transmitting method, which comprises the following steps:
step S1: the master control center sets a radio frequency matching gain control module according to the signal characteristics to complete signal amplitude adjustment, and transmits the modulated signal to the light modulation module to perform electro-optical signal conversion;
step S2: the optical demodulation module demodulates and reduces the optical signal into an original radio frequency signal to perform photoelectric signal conversion according to the characteristics of the optical signal;
and step S3: monitoring channel signals in the whole process, reporting the monitoring result, and automatically switching backup link channels by the nodes which are found to be abnormal.
The intelligent health diagnosis radio frequency optical fiber multiplexing and transmitting device provided by the invention comprises the intelligent health diagnosis radio frequency optical fiber multiplexing and transmitting system.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention monitors the full-link heartbeat of the mutual conversion of the radio frequency signal and the optical signal and autonomously switches channels according to the monitoring result, tracks the performance of the whole communication link for a long time, intelligently analyzes and quantifies the decline trend of the performance, automatically captures the jump of the signal, remotely issues an instruction control system, adopts voltage feedback control on an electro-optical conversion part, and guarantees the stable output of a light source by a temperature negative supplement control means, thereby realizing the high fidelity restoration of the radio frequency signal, simultaneously having anti-misoperation measures and redundancy design means, and providing the safety, reliability and fault tolerance of the system.
2. According to the invention, the feedback signal is compared with the set value through the differential circuit, so that the driving current is compensated, the stability of the output power of the laser is realized, and finally the power driving control is realized.
3. According to the invention, sampling analysis is carried out on the ambient temperature of the laser and the light modulation module, reverse compensation is carried out on the temperature, the laser and other devices are ensured to work in a high-efficiency amplification area, and the working wavelength drift is avoided.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is an overall schematic diagram of an intelligent health diagnosis radio frequency fiber-to-fiber multiplexing transmission system according to the present invention;
FIG. 2 is a schematic diagram of the intelligent health diagnosis RF optical fiber switching system according to the present invention;
FIG. 3 is a schematic diagram of the operation of the automatic power control module of the present invention;
FIG. 4 is a schematic diagram of the operation of the automatic temperature control module of the present invention;
fig. 5 is a flow chart of the monitoring of the downlink signal switching control in the present invention;
fig. 6 is a flow chart of monitoring of uplink signal transition control in the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the concept of the invention. All falling within the scope of the present invention.
As shown in fig. 1 to 6, the present invention provides an intelligent health diagnosis rf fiber-to-fiber conversion and multiplexing transmission system, which improves reliability and adaptivity of a satellite transmission base to remote wireless communication, and prevents occurrence of abnormal communication caused by system performance degradation, realizes full link heartbeat monitoring for mutual conversion of rf signals and optical signals, autonomously switches channels according to monitoring results, tracks the performance of the whole communication link for a long time, intelligently analyzes a degradation trend of quantization performance, automatically captures signal jump, remotely issues an instruction control system, adopts voltage feedback control for an electro-optical conversion part, and guarantees stable output of a light source by a temperature negative supplementary control means, thereby realizing high fidelity restoration of rf signals, and simultaneously has anti-misoperation measures and redundancy design means, and provides safety, reliability and fault tolerance of the system.
The method specifically comprises the following components:
the light modulation module: according to the frequency band characteristics of the input radio frequency signals, the radio frequency signals are modulated onto light waves with matched ITU-T standard wavelength and output to perform electro-optical signal conversion.
A light demodulation module: restoring the optical signal into an inlet end radio frequency signal according to the characteristics of the inlet end signal; according to different optical wavelengths, the optical signals are restored into radio frequency signals, and the radio frequency signals correspond to the radio frequency signals at the inlet ends one to one. The optical demodulation module demodulates the wavelength division multiplexed coincidence signals, reduces the radio frequency signals and transmits the radio frequency signals to corresponding channels, and the whole process of converting the radio frequency signals to the optical signals and then to the radio frequency signals is completed.
Wavelength division multiplexing module: the optical signals modulated by the optical modulation module are converged together or the composite optical signals on the optical cables are transmitted to the optical modulation module, so that the composite optical signals can be transmitted on the same optical cable, and the optical modulation module receives the transmitted optical signals and restores the optical signals into radio frequency signals to be sent to the rear end. Specifically, the optical signals modulated by the optical modulator are converged together and transmitted to the wavelength division multiplexing module at the rear end through the optical cable, and the wavelength division multiplexing module at the rear end transmits the optical signals with different wavelengths to corresponding radio frequency transmission channels, so that the optical signals with different wavelengths and transmitted in the same direction are transmitted on the same optical cable, and the requirements on the optical cable are reduced;
an automatic power control module: according to the collection of working voltage and current of a laser, an optical modulator and a demodulator, the voltage and the current of a working module are compensated through a differential-integral-circuit; the automatic power control module drives the current control unit to enable the main control board to give a control signal to the laser driving unit according to the output power requirement of the laser, and stable driving current is provided for the laser. In addition, the driving current feedback compensation unit converts the received differential-integral-feedback current into voltage and properly amplifies the voltage, and compares a feedback signal with a set value through a differential circuit to further compensate the driving current, so that the stability of the output power of the laser is realized, and finally the power driving control is realized.
An automatic temperature control module: sampling analysis is carried out according to the ambient temperature of the laser and the light modulation and demodulation module, reverse compensation is carried out according to the change of the temperature, and the control of the temperature is realized. Specifically, sampling analysis is carried out according to the ambient temperature of the laser and the light modulation module, reverse compensation is carried out on the temperature, the laser and other devices are guaranteed to work in a high-efficiency amplification area, and working wavelength drift is avoided.
The radio frequency matching gain control module: the impedance matching of a radio frequency input medium is completed, the amplitude of a signal is adjusted, and local adjustment and instruction adjustment of a receiving master control center are supported; the radio frequency matching gain control module receives radio frequency signals and simultaneously shunts small signals for analyzing the signals, performs front control on signal amplitude and the like in a radio frequency range, and transmits the radio frequency signals to the light modulation module after signal amplitude adjustment is completed.
A signal measurement module: and measuring the signals in real time, and feeding back the measured data to a master control center. The signal measurement module carries out detection measurement on the signals while transmitting the signals, and sends the measurement result to the master control center through the network, and the master control center analyzes the current state index, gives a performance change value by combining the historical index, and predicts the service life of the system.
The master control center: the information processing center of the system processes the information transmitted by each link, analyzes the measurement result and issues an action instruction according to judgment conditions such as a threshold value and the like. The quality of the signal is measured by a network control instrument, the measurement result is analyzed and processed, fault and health diagnosis is automatically carried out, the front section receives the adjustment of the rear end signal sending gain, and the link is switched, receives and executes a manual intervention instruction.
The system needs to monitor signals for a long time, wherein the signal indexes of the power change trend, the frequency drift trend and the frequency spectrum change trend of the signals are analyzed, the quantitative value of the trend change is given according to the index element classification, the health evaluation is carried out on the system, and when the signal deterioration is lower than the early warning value, the channel is automatically switched and the state is reported.
The main control center finishes capturing, analyzing and processing instantaneous mutation signals through the signal measuring module, the instantaneous mutation signals comprise time of signal mutation, mutation parameters and mutation quantity, the system is combined to set actions to autonomously judge the cause of the signal mutation, and if the mutation quantity is larger than an early warning value, a communication link is autonomously switched.
The heartbeat monitoring of the whole link system is completed through the signal measuring module and the master control center, the signal quality is evaluated at intervals of corresponding time, all communication links are polled, and the channels are switched autonomously according to the evaluation result.
According to different radio frequency bands, signals are modulated to light waves with different wavelengths, and the minimum distance of the interval is the interference between the signals without focal modulation and the like; the modulated light waves with different wavelengths are converged to a wavelength division multiplexing module, and the wavelength division multiplexing modules arranged at two ends of different places realize the transmission of all signals through one optical fiber.
The invention also provides an intelligent health diagnosis radio frequency optical fiber conversion multiplexing method, which comprises the following steps:
step S1: the master control center sets a radio frequency matching gain control module according to signal characteristics to complete signal amplitude adjustment, and transmits the modulated signals to the light modulation module to perform electro-optical signal conversion. Specifically, the method comprises the following steps:
step S1.1: the signal measurement module is used for receiving and transmitting radio frequency signals and simultaneously completing measurement, the master control center sets the radio frequency matching gain control module according to signal characteristics to complete signal amplitude adjustment, and the modulated signals are transmitted to the light modulation module; meanwhile, the master control terminal carries out heartbeat monitoring on the real-time signals in the whole working period and reports the results.
Step S1.2: the radio frequency signals with the adjusted amplitude are transmitted to the electro-optical modulation module for modulation, the radio frequency signals with different frequency bands are modulated to light waves with different wavelengths according to the corresponding characteristics of the frequency bands, the light waves are converged on the light wave multiplexing module to complete convergence of the light signals, and the converged signals are transmitted through the optical medium.
Step S2: the optical demodulation module demodulates and reduces the optical signal into an original radio frequency signal to perform photoelectric signal conversion according to the characteristics of the optical signal; specifically, the method comprises the following steps:
step S2.1: the optical demodulation module demodulates and restores the optical signals into original radio frequency signals according to the characteristics of the optical signals, and sends different radio frequency signals to corresponding radio frequency demodulation channels.
Step S2.2: the optical signals are reduced into radio frequency signals and sent to the user side, meanwhile, the radio frequency signals are synchronously measured and analyzed, the analysis result is processed through the master control center, and an instruction is issued or the amplitude of the radio frequency signals is locally adjusted.
And step S3: monitoring channel signals in the whole process, reporting the monitoring result, and automatically switching backup link channels by the nodes which are found to be abnormal.
The invention also provides an intelligent health diagnosis radio frequency optical fiber conversion and multiplexing transmitting device which comprises the intelligent health diagnosis radio frequency optical fiber conversion and multiplexing transmitting system.
The invention adopts the design that the main control panel and each unit control circuit are separated, and the main control panel mainly realizes the functions of communication, control and power supply conversion. The main control board communicates and controls with each internal unit control board through RS232 and RS485, reports various working state parameters in the module, and the power supply conversion part realizes the conversion of internal required voltage and supplies power for each unit circuit.
As shown in fig. 2, the S-band and X-band rf optical transmission mainly includes two peer-to-peer electro-optical modem devices distributed in different places, and realizes bidirectional optical transmission of rf signals from the UHF band to the X band. According to the power of the ERIP output port of the satellite antenna, the total control computer performs the setting of the gain and the attenuation of the receiving end and adjusts the signal power to a proper range; the light modulation module adopts ITU-T standard wavelength according to the frequency band corresponding to the radio frequency signal, the wavelength interval is 200GHz, the corresponding wavelength is about 1.6nm, and different frequency bands occupy different wavelengths; the wavelength division multiplexing module transmits the wavelengths in the same direction through a single optical fiber to realize communication of sites distributed in different places, the system realizes redundancy design through the main link and the standby link, reliability is improved, an abnormal state is reported, and manual intervention is requested.
The signal measurement module carries out detection measurement on the signals while transmitting the signals, and sends the measurement result to the master control center through the network, and the master control center analyzes the current state index, gives a performance change value by combining the historical index and predicts the service life of the system; and carrying out heartbeat monitoring on a communication link, wherein the monitoring content comprises signal power intensity, signal spectrum characteristics and the like, autonomously switching a backup link when a signal is abnormal, ensuring normal satellite communication when the switching process is at millisecond level, reporting an abnormal state and requesting manual intervention.
According to the power of an EIRP output port of the satellite antenna, the space attenuation and the measured value of the wave detection at the inlet end of the master control center, the gain and the attenuation of the system are adjusted, so that the signals enter the optical modulation module and the optical demodulation module to meet the requirements.
As shown in fig. 3, the automatic power control module drives the current control unit to make the main control board provide a control signal to the laser driving unit according to the output power requirement of the laser, so as to provide a stable driving current for the laser. In addition, the driving current feedback compensation unit converts the received MPD feedback current into voltage and amplifies the voltage appropriately, and compares a feedback signal with a set value through a differential circuit, so that the driving current is compensated, the output power of the laser is stabilized, and the automatic power control driving is finally realized.
As shown in fig. 4, an attitude control temperature control module. When current flows through the thermoelectric refrigerator, heat is transferred from one side of the thermoelectric refrigerator to the other side of the thermoelectric refrigerator, and one end of the thermoelectric refrigerator is used for refrigerating, and the other end of the thermoelectric refrigerator is used for heating; if the direction of the current is reversed, the cooling and heating ends are also reversed. The thermistor is a resistance element made of a semiconductor material having a large temperature coefficient of resistance, and usually the thermistor incorporated in the laser is a negative temperature coefficient resistor. The working temperature of the laser is monitored in real time and compared with a set target working temperature, and the voltage and the current of the TEC are fed back and controlled by a comparison result through the PID compensation network so as to realize the heating or the refrigeration of the laser and further realize the stability of the working temperature and the output wavelength of the laser. Different target temperatures can be set by choosing different values of Vt. In thermal equilibrium, the refrigerator controls the resistance of the thermistor so that V1= Vt, and a proportional-derivative-integral (PID) circuit outputs a constant voltage value so that the refrigerator operates at a constant current, thereby maintaining the temperature of the laser chip constant. When the thermistor detects that the temperature of the laser rises, the resistance value drops, V1 becomes small, an error signal (Vt-V1) is obtained, the error signal is amplified and then enables the voltage at two ends of the refrigerator to rise stably through the PID circuit, the refrigerating current is increased, the temperature drops, the resistance value of the thermistor rises until V1= Vt, and the laser recovers to the originally set temperature. Similarly, when the temperature drops, the control circuit reduces the cooling current to keep the laser working at the set temperature. The TEC control adopts an ADN8834 chip which is commonly used for laser temperature control, the driving current of the chip can reach +/-1.5A, the conversion efficiency is high, the conversion efficiency can reach more than 85% at the current of 1A, and the self heat consumption is small.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, units provided by the present invention as pure computer readable program code, the system and its various devices, modules, units provided by the present invention can be fully implemented by logically programming method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. An intelligent health diagnosis radio frequency optical fiber forwarding and multiplexing system is characterized by comprising:
the light modulation module: modulating the input radio frequency signal to a light wave with matched ITU-T standard wavelength according to the frequency band characteristics of the input radio frequency signal and outputting the light wave to perform electro-optical signal conversion;
an optical demodulation module: restoring the optical signal into an inlet end radio frequency signal according to the characteristics of the inlet end signal;
wavelength division multiplexing module: converging the optical signals modulated by the optical modulation module or transmitting the composite optical signals on the optical cables to the optical demodulation module, so that the composite optical signals can be transmitted on the same optical cable, and the optical demodulation module receives the transmitted optical signals and restores the optical signals into radio frequency signals to be sent to the rear end;
an automatic power control module: according to the collection of working voltage and current of a laser, an optical modulator and a demodulator, the voltage and the current of a working module are compensated through a differential-integral-circuit;
an automatic temperature control module: sampling and analyzing the ambient temperature of the laser and the light modulation and demodulation module, and performing reverse compensation according to the change of the temperature to realize the control of the temperature;
the radio frequency matching gain control module: the impedance matching of a radio frequency input medium is completed, the amplitude of a signal is adjusted, and the local adjustment and the instruction adjustment of a receiving master control center are supported;
a signal measurement module: measuring the signals in real time, and feeding back the measured data to a master control center;
a master control center: the information processing center of the system processes the information transmitted by each link, analyzes the measurement result and issues an action instruction according to judgment conditions such as a threshold value and the like.
2. The intelligent health diagnosis radio frequency optical fiber multiplexing transmission system according to claim 1, wherein the radio frequency matching gain control module shunts small signals for analyzing signals while receiving radio frequency signals, performs front-bit control on signal amplitude and the like in a radio frequency band, and transmits the radio frequency signals to the optical modulation module after signal amplitude adjustment is completed.
3. The intelligent health diagnosis radio frequency optical fiber multiplexing and transmitting system of claim 1, wherein the signal measurement module performs detection measurement on the signal while transmitting the signal, and sends the measurement result to the master control center through a network, the master control center analyzes the current state index, gives a performance change value by combining the historical index, and predicts the system life;
the master control center: the quality of the signal is measured by a network control instrument, the measurement result is analyzed and processed, fault and health diagnosis is automatically carried out, the front section receives the adjustment of the rear end signal sending gain, and the link is switched, receives and executes a manual intervention instruction.
4. The intelligent health diagnosis radio frequency optical fiber multiplexing and transmitting system of claim 1, wherein the system needs to monitor signals for a long time and comprises the steps of analyzing signal indexes of power variation trend, frequency drift trend and frequency spectrum variation trend of the signals, performing health assessment on the system, providing quantitative values of trend variation according to index element classification, and automatically switching channels and reporting states after signal deterioration is lower than an early warning value.
5. The radio frequency fiber forwarding and transmitting system for intelligent health diagnosis according to claim 1, wherein the signal measurement module is used for completing capturing, analyzing and processing of instantaneous mutation signals by the master control center, wherein the instantaneous mutation signals comprise time, mutation parameters and mutation variables of the signals, the system setting action is combined for autonomously judging the cause of the signal mutation, and if the mutation variables are larger than the early warning value, the communication link is autonomously switched.
6. The system according to claim 1, wherein the system performs heartbeat monitoring on the entire link system through the signal measurement module and the master control center, evaluates the signal quality at intervals of corresponding time, polls all communication links, and autonomously switches channels according to the evaluation result.
7. The intelligent health diagnosis radio frequency fiber optic multiplexing transmission system according to claim 1, wherein signals are modulated onto optical waves with different wavelengths according to different radio frequency bands, and the minimum distance of the interval is such that no interference occurs between signals such as focal modulation; the modulated light waves with different wavelengths are converged to a wavelength division multiplexing module, and the wavelength division multiplexing modules deployed at two ends of different places realize the transmission of all signals through one optical fiber.
8. The intelligent health diagnosis radio frequency fiber optic conversion and multiplexing system according to claim 1, wherein the optical demodulation module demodulates the wavelength division multiplexed compliant signals, restores the radio frequency signals and transmits the restored radio frequency signals to corresponding channels, thereby completing the whole process of converting the radio frequency signals to optical signals and then to radio frequency signals.
9. An intelligent health diagnosis radio frequency optical fiber switching and transmitting method is characterized by comprising the following steps:
step S1: the master control center sets a radio frequency matching gain control module according to the signal characteristics to complete signal amplitude adjustment, and transmits the modulated signal to the light modulation module to perform electro-optical signal conversion;
step S2: the optical demodulation module demodulates and restores the optical signal into an original radio frequency signal according to the characteristics of the optical signal to perform photoelectric signal conversion;
and step S3: monitoring the channel signals in the whole process, reporting the monitoring result, and automatically switching the backup link channel when finding an abnormal node.
10. An intelligent health diagnosis radio frequency fiber optic multiplexing transmitting device, which is characterized by comprising the intelligent health diagnosis radio frequency fiber optic multiplexing transmitting system of claims 1 to 8.
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