CN113067789B - Intelligent monitoring system for communication engineering feature recognition - Google Patents
Intelligent monitoring system for communication engineering feature recognition Download PDFInfo
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- CN113067789B CN113067789B CN202110323286.7A CN202110323286A CN113067789B CN 113067789 B CN113067789 B CN 113067789B CN 202110323286 A CN202110323286 A CN 202110323286A CN 113067789 B CN113067789 B CN 113067789B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
- H04K3/62—Jamming involving special techniques by exposing communication, processing or storing systems to electromagnetic wave radiation, e.g. causing disturbance, disruption or damage of electronic circuits, or causing external injection of faults in the information
Abstract
The invention discloses an intelligent monitoring system for communication engineering characteristic identification, which comprises a noise filtering band-pass circuit, a frequency monitoring circuit, an average value detection circuit, a peak value detection circuit and a peak value interference judgment circuit, wherein an operational amplifier AR7 is used for carrying out subtraction proportional operation on voltage which is 1/0.6366 times of the average value of communication engineering wireless signals and real-time peak values of the communication engineering wireless signals, when an operation result output by the operational amplifier AR7 is larger than a voltage division value of a resistor R17 and a resistor R23 or smaller than a voltage division value of a resistor R30 and a resistor R31, high level is output to an ASK control terminal, the intensity of electromagnetic interference on wireless signals of ASK communication equipment in the wireless communication engineering carrier transmission process can be monitored, and when the intensity of the electromagnetic interference is enough to greatly change the amplitude value and the frequency characteristic of the wireless signals of the ASK communication equipment, a high level early warning is sent to the ASK control terminal, and reminding the communication engineering construction management and control center to timely condition the transmitting power of each communication system and prevent lightning interference.
Description
Technical Field
The invention relates to the technical field of communication engineering, in particular to an intelligent monitoring system for communication engineering feature recognition.
Background
An original electrical signal at a transmitting end of a communication system usually has a very low frequency spectrum component, and is generally not suitable for being directly transmitted in a channel, so that the original signal usually needs to be converted into a high-frequency signal with a frequency band suitable for channel transmission, the process is called modulation, the modulated signal is called a modulated signal, and the modulated signal carries information and is suitable for being transmitted in the channel; the ASK modulation mode is a common digital modulation mode in wireless communication engineering carrier transmission;
however, in the wireless communication engineering carrier transmission process of the modulated signal, electromagnetic interference is very easily caused, for example, because an electromagnetic pulse generated by lightning has both a high-energy low-frequency component and a high-frequency component with high permeability, the frequency jump of a wireless signal of communication equipment is enhanced, a large amount of burrs appear on a waveform, and serious amplitude distortion occurs, and particularly, the interference on the wireless signal modulated by ASK is very large; because the frequency ranges used by wireless broadcast, television, radar, microwave relay communication systems and mobile communication are close and the peak power is high, fundamental waves and harmonics of the systems can generate larger radiation, and enter the corresponding receiving end of the communication system along with wireless signals of each communication device, so that the central frequency of the wireless signals of each communication device shifts, the waveform peak value generates distortion, and the above conditions occur, so that the wireless signals of ASK communication devices are subjected to electromagnetic interference in the carrier transmission process of wireless communication engineering, the amplitude and frequency characteristics of the wireless signals of the ASK communication devices are changed, the comparison and judgment processes of the subsequent demodulation processes of each communication system are influenced mutually, wrong code elements are obtained, the conditions of noise generation of a radio, snowflake generation of television pictures and mobile phone call interruption are caused, and the accuracy rate of information transmission of each communication system is reduced, the normal living standard of people is lowered.
Disclosure of Invention
In view of the above situation, an object of the present invention is to provide an intelligent monitoring system for communication engineering feature recognition, which can monitor the strength of electromagnetic interference on a wireless signal of ASK communication equipment during carrier transmission of a wireless communication engineering in an ASK modulation mode, and send a high-level warning to an ASK control terminal when the strength of the electromagnetic interference is enough to change the amplitude and frequency features of the wireless signal of ASK communication equipment substantially, so as to remind a communication engineering construction management and control center to condition the transmission power of each communication system in time and prevent lightning interference.
The technical scheme includes that the system comprises an ASK modulation transmitter, an ASK modulation receiver, an ASK communication monitoring module, an ASK control terminal and a communication engineering construction control center, and is characterized in that the ASK modulation transmitter ASK modulates baseband signals in communication equipment to obtain communication engineering wireless signals, the communication engineering wireless signals are transmitted to the ASK modulation receiver, the ASK communication monitoring module samples the communication engineering wireless signals received by the ASK modulation receiver, compares the frequency of the communication engineering wireless signals with the central frequency of a carrier used when the ASK modulation transmitter ASK modulates in real time, compares the peak value of the communication engineering wireless signals with the average value of the communication engineering wireless signals after noise filtering in real time, and transmits the comparison result to the ASK control terminal, the ASK control terminal sends a warning to the communication engineering construction control center after receiving the comparison result transmitted by the ASK communication monitoring module, and the ASK communication monitoring module comprises a noise filtering band-pass circuit, The device comprises a frequency monitoring circuit, an average value detection circuit, a peak value detection circuit and a peak value interference judgment circuit;
the noise filtering band-pass circuit utilizes a resistor R4-R5, a capacitor C3-C5 and an inductor L1 to form a band-pass network 1, interference signals outside carrier center frequency of communication engineering wireless signals are filtered, a resistor R1-R2 and a capacitor C1-C2 are utilized to form a band-pass network 2, the interference signals outside baseband signal center frequency are filtered, the frequency monitoring circuit utilizes a power supply +5V to charge the capacitor C6 through the resistor R6, meanwhile, when the communication engineering wireless signals are in positive half cycle, the power supply +5V is utilized to charge the capacitor C7, when charging voltage on the capacitor C7 reaches control electrode conducting voltage of a silicon controlled rectifier Q1, the charging voltage is loaded at a positive input end of an operational amplifier AR3, when the charging voltage on the capacitor C6 reaches control electrode conducting voltage of the silicon controlled rectifier Q2, the charging voltage is loaded at a reverse input end of the operational amplifier AR3, the operational amplifier AR3 and the resistor R8-R11 form a proportional differential circuit, the differential value proportion operation is carried out on the voltage of two input ends of an operational amplifier AR3, if the operational amplifier AR3 has output, a power supply +5V high level is output to an input port of an ASK control terminal, the average value detection circuit carries out full-wave rectification on a communication engineering wireless signal by using the operational amplifier AR4, a full-wave rectified continuous signal charges a capacitor C9 through a resistor R27, a capacitor C9 discharges through the R26, the resistance value of the resistor R27 is equal to that of the resistor R2, the voltage on the capacitor C9 is amplified through an in-phase proportion circuit consisting of the operational amplifier AR9 and resistors R34-R36, the peak value detection circuit charges the capacitor C8 when the communication engineering wireless signal is in a positive half cycle, quickly discharges through the resistor R32 when the communication engineering wireless signal is in a negative half cycle, and carries out addition operation with the power supply +0.7V through the operational amplifier AR6 in real time, the peak value interference judgment circuit carries out the proportion operation on the output of the average value detection circuit and the output of the peak value detection circuit in real time, if the operational amplifier AR7 has output, the +5V high-point output of the power supply is output to the STC9C51 singlechip timer counter for counting.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
1. when the charging voltage of the capacitor C7 reaches the conducting voltage of the control electrode of the silicon controlled rectifier Q1, whether the charging voltage of the capacitor C6 reaches the conducting voltage of the control electrode of the silicon controlled rectifier Q2 or not is judged, if yes, the frequency characteristic of the communication engineering wireless signal is not changed due to electromagnetic interference, and if not, the frequency characteristic of the communication engineering wireless signal is changed due to electromagnetic interference, and a +5V high level is output to an ASK control terminal when the frequency characteristic of the communication engineering wireless signal is changed due to electromagnetic interference;
carrying out subtraction proportional operation on the voltage which is 1/0.6366 times of the average value of the communication engineering wireless signals and the real-time peak value of the communication engineering wireless signals by using an operational amplifier AR7, and when the operation result output by the operational amplifier AR7 is larger than the voltage division value of a resistor R17 and a resistor R23 or smaller than the voltage division value of a resistor R30 and a resistor R31, indicating that the peak value characteristic of the communication engineering wireless signals is changed due to electromagnetic interference, and outputting a +5V high level to an ASK control terminal;
when the ASK control terminal receives the high level transmitted by the peak interference judging module, the ASK control terminal sends a warning to the communication engineering construction management and control center to remind the communication engineering construction management and control center to investigate the transmitting power and the transmitting frequency band of each communication system and investigate the strength of lightning interference, so that the transmitting power of each communication system can be regulated in time, and the lightning interference can be prevented.
2. When the communication engineering wireless signal is in a positive half cycle, the capacitor C8 is charged by the conduction of the diode D2, and when the communication engineering wireless signal is in a negative half cycle, the capacitor C8 is discharged by the conduction of the diode D5 through the electron R32, the peak value of the next round of communication engineering wireless signal is restarted to be detected, and the situation that a peak value detection circuit cannot detect the correct communication engineering wireless signal peak value in real time when the peak value of the communication engineering wireless signal is changed is prevented.
Drawings
FIG. 1 is a schematic diagram of a noise filtering bandpass circuit of the present invention;
FIG. 2 is a schematic diagram of a frequency monitoring circuit of the present invention;
FIG. 3 is a schematic diagram of an average detection circuit of the present invention;
FIG. 4 is a schematic diagram of a peak detection circuit of the present invention;
fig. 5 is a schematic diagram of a peak interference determination circuit according to the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 5. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
An intelligent monitoring system for communication engineering feature recognition comprises an ASK modulation transmitter, an ASK modulation receiver, an ASK communication monitoring module, an ASK control terminal and a communication engineering construction management and control center, wherein the ASK communication monitoring module comprises a noise filtering band-pass circuit, a frequency monitoring circuit, an average value detection circuit, a peak value detection circuit and a peak value interference judgment circuit; ASK modulation emitter ASK modulates the baseband signal of communication equipment in each communication system to obtain communication engineering wireless signal and emits the wireless signal to corresponding ASK modulation receiver, ASK communication monitoring module samples the communication engineering wireless signal received by ASK modulation receiver and compares the frequency of the communication engineering wireless signal with the central frequency of the carrier wave used by ASK modulation emitter in real time, compares the peak value of the communication engineering wireless signal with the average value after noise filtering in real time and sends the comparison result to ASK control terminal, ASK control terminal receives the high level comparison result transmitted by ASK communication monitoring module and sends warning to communication engineering construction management and control center to remind the communication engineering construction management and control center to check the emission power and emission frequency band of each communication system and to check the thunder and lightning interference intensity so as to regulate the emission power and lightning interference intensity of each communication system in time, Lightning interference is prevented.
In order to improve the accuracy of the frequency monitoring circuit for obtaining the cycle duration and the average value of the average value detection circuit and prevent the influence of electromagnetic interference mixed with communication engineering wireless signals on the frequency monitoring circuit, a noise filtering band-pass circuit is adopted, a resistor R4-R5, a capacitor C3-C5 and an inductor L1 form a band-pass network 1, the center frequency of the band-pass network is the carrier center frequency of the communication engineering wireless signals, and interference signals outside the carrier center frequency of the communication engineering wireless signals are filtered; the capacitor C4 and the resistor R5 form a high-pass filter network 1, an interference signal smaller than the carrier center frequency of the communication engineering wireless signal is dropped to the ground, the resistor R4 and the capacitor C5 form a low-pass filter network 1, an interference signal larger than the carrier center frequency of the communication engineering wireless signal is dropped to the ground, the capacitor C3 and the inductor L1 form a parallel resonant network, the resonant frequency of the parallel resonant network is the carrier center frequency of the communication engineering wireless signal, the interference signal outside the carrier center frequency of the communication engineering wireless signal is further filtered, and the filtering degree of the band-pass network 1 is improved;
a resistor R1-R2 and a capacitor C1-C2 form a band-pass network 2, wherein the center frequency of the band-pass network is the center frequency of a baseband signal so as to filter interference signals outside the center frequency of the baseband signal; the capacitor C2 and the resistor R1 form a high-pass filter network 2, interference signals smaller than the center frequency of baseband signals are shunted to the ground, the resistor R2 and the capacitor C1 form a low-pass filter network 2, and interference signals larger than the center frequency of the baseband signals are shunted to the ground; according to Fourier series theory and Dirichlet condition, a periodic signal is formed by overlapping a plurality of harmonics with different frequencies, so that a baseband signal is reserved to ensure the integrity of a wireless signal of communication engineering; and the operational amplifier AR1 is used as a follower to increase the input impedance of the filter bandpass circuit.
In order to monitor whether the strength of electromagnetic interference on a communication engineering wireless signal in an ASK wireless carrier communication process is enough to change the frequency characteristic of the communication engineering wireless signal greatly, a frequency monitoring circuit is adopted, a power supply +5V is used for charging a capacitor C6 through a resistor R6, if the charging voltage on a capacitor C6 reaches the control electrode conduction voltage of a thyristor Q2, the charging voltage on a capacitor C6 is loaded to a contact 2 and a contact 4 of a relay K2 through the thyristor, at the moment, the relay K2 is conducted, the contact 3 is communicated with the contact 4, and the charging voltage on the capacitor C6 is loaded to the inverting input end of an operational amplifier AR3 through a resistor R8; the charging voltage of the capacitor C6 reaches the conduction voltage of the control electrode of the controlled silicon Q2Time of pressing
Wherein V Q2 The on-state voltage of the control electrode of the controllable silicon Q2 is obtained, and the period of time is also 100 periods of the wireless signal carrier wave of the communication engineering;
meanwhile, the operational amplifier compares the communication engineering wireless signal with the ground in real time, when the communication engineering wireless signal is in a positive half cycle, the relay K1 is switched on, the power supply +5V is switched on the contact 2 through the contact 1 of the relay K1 to charge the capacitor C7, when the communication engineering wireless signal is in a negative half cycle, the relay K1 is switched off, and the capacitor C7 stops charging; if the charging voltage on the capacitor C7 reaches the control electrode conduction voltage of the thyristor Q1, the charging voltage on the capacitor C7 is loaded to the contact 2 and the contact 4 of the relay K3 through the thyristor, at the moment, the relay K3 is conducted, the contact 3 is connected with the contact 4, and the charging voltage on the capacitor C7 is loaded to the non-inverting input end of the operational amplifier AR3 through the resistor R9; the time when the charging voltage of the capacitor C7 reaches the turn-on voltage of the controlled pole of the controlled silicon Q1
Wherein V Q1 The on-state voltage of the control electrode of the controllable silicon Q1 is obtained, and the period of time is also 50 period durations of the wireless signal carrier wave of the communication engineering;
the conducting voltage of the control electrode of the thyristor Q1 is the same as that of the control electrode of the thyristor Q2, because the relay K1 is conducted only when the communication engineering wireless signal is in a positive half cycle, and is not conducted in the positive half cycle, when the voltage of the capacitor C7 reaches the conducting voltage of the control electrode of the thyristor Q1, if the voltage of the capacitor C6 reaches the conducting voltage of the control electrode of the thyristor Q2 at the same time, the frequency of the communication engineering wireless signal is consistent with the frequency of a carrier wave used when ASK modulation is carried out on the communication engineering wireless signal, and the electromagnetic interference is not enough to change the frequency characteristic of the communication engineering wireless signal greatly;
a difference proportion circuit is formed by the operational amplifier AR3 and the resistors R8-R11, the charging voltage on the capacitor C7 and the charging voltage on the capacitor C6 are subjected to difference proportion operation in real time, as long as the operational amplifier AR3 outputs a level, no matter the level is a positive level or a negative level, the frequency of a communication engineering wireless signal is inconsistent with the frequency of a carrier wave used when ASK modulation is carried out, the frequency characteristic of the communication engineering wireless signal is greatly changed by electromagnetic interference, at the moment, if the level output by the operational amplifier AR3 is the positive level and the positive level is enough to conduct the field effect transistor Q4, a power supply +5V high level is output to an input port of an ASK control terminal through the field effect transistor Q4; if the level output by the operational amplifier AR3 is a negative level, and the negative level is sufficient to turn on the fet Q3, the +5V high level of the power supply is output to the ASK control terminal through the fet Q3; when the level value output by the operational amplifier AR3 is not enough to turn on the fet Q3 or fet Q4, it indicates that the frequency of the wireless signal in the communication engineering and the frequency of the carrier wave used when the ASK modulation is performed are within the error range;
the ASK control terminal receives the high level transmitted by the frequency monitoring module, and sends a warning to the communication engineering construction control center to remind the communication engineering construction control center to investigate the transmitting power and the transmitting frequency band of each communication system and investigate the strength of lightning interference, so that the transmitting power of each communication system can be regulated in time, and the lightning interference can be prevented.
In order to detect the average value of the wireless signals of the communication engineering, the average value detection circuit is used for comparing the wireless signals of the communication engineering with the ground in real time by using the operational amplifier AR5, when the wireless signals of the communication engineering are in a positive half cycle, the operational amplifier AR5 outputs a positive level, the field effect transistor Q7 is conducted, the wireless signals of the communication engineering charge the capacitor C9 through the field effect transistor Q7, the diode D3 and the resistor R27, when the wireless signals of the communication engineering are in a negative half cycle, the operational amplifier AR5 outputs a negative level, the field effect transistor Q5 is conducted, the wireless signals of the communication engineering charge the capacitor C9 through the field effect transistor Q5, the diode D3 and the resistor R27, the capacitor C9 discharges through the R26, the resistor R27 is equal to the resistance value of the resistor R2, so that the charging and discharging time of the capacitor C9 is the same, the capacitor C9 is repeatedly charged and discharged, and discharged voltage on the capacitor C9 is the average value of the wireless signals of the communication engineering, the load is loaded at the non-inverting input end of the operational amplifier AR9 through a resistor R34;
the inductor L2 and the resistor R33 are used for compensating the phase of the capacitor C9 so as to keep the average of the series voltage of the resistor R27 and the capacitor C9, and the operational amplifier AR8 is used as a follower to play a buffering role; because the average value of the wireless signals in the communication engineering is 0.6366 times of the peak value, the voltage on the capacitor C9 is amplified by an in-phase proportional circuit consisting of an operational amplifier AR9 and resistors R34-R36, the in-phase proportional circuit consisting of an operational amplifier AR9 and resistors R34-R36 is used, the proportional coefficient is 1/0.6366, and the ratio of the resistance values of the resistors R36 and R35 is determined.
In order to detect the peak value of the wireless signal of the communication engineering in real time and take the peak value interference judgment circuit as a basis, a peak value detection circuit is adopted, when the wireless signal of the communication engineering is in a positive half cycle, a diode D2 is conducted, the wireless signal of the communication engineering charges a capacitor C8, when the wireless signal of the communication engineering is in a negative half cycle, a diode D5 is conducted, a capacitor C8 is rapidly discharged through a resistor R32, and the peak value of the wireless signal of the communication engineering is detected in sub real time;
an operational amplifier AR6, resistors R15-R16, resistors R21, R25 and R29 are used for forming an addition proportional circuit, the peak voltage of a wireless signal in a communication engineering is added with a power supply +0.7V in real time through the operational amplifier AR6, the power supply +0.7V is used for compensating the tube voltage drop of a diode D2, and the proportional coefficient of the addition proportional circuit is 1 and is determined by the ratio of the resistance values of the resistors R16 and R15.
In order to monitor whether the intensity of electromagnetic interference on a communication engineering wireless signal in an ASK wireless carrier communication process is enough to change the peak value characteristic of the communication engineering wireless signal greatly, a peak value interference judging circuit is adopted, an operational amplifier AR7, resistors R20, R22, R24 and R28 are used to form a subtraction proportion circuit, the output of an average value detection circuit and the output of a peak value detection circuit are subjected to subtraction proportion operation in real time, the proportion coefficient is 1, when the output of the operational amplifier AR7 is a positive level and is larger than the voltage division values of resistors R17 and R23, the voltage division values of the resistors R17 and R23 are the positive amplitude values of the communication engineering wireless signal, a diode D1 is conducted, a field effect tube Q6 is conducted, a power supply +5V high level is output to an STC9C51 singlechip timing counter, when the output of the operational amplifier AR7 is a negative level and is lower than the voltage division values of the resistors R30-R31, the voltage division values of the resistors R30-R31 are the negative amplitude values of the communication engineering wireless signal, the diode D4 is conducted, the field effect transistor Q9 is conducted, the +5V high level of the power supply is output to the STC9C51 single-chip microcomputer timing counter, the count trigger mode of the STC9C51 single-chip microcomputer timing counter is high level trigger, namely, the count is carried out once when the high level is received once, and when the count value reaches 10 times, the STC9C51 single-chip microcomputer sends out a high level warning to the ASK control terminal;
when the ASK control terminal receives the high level transmitted by the peak interference judging module, the ASK control terminal sends a warning to the communication engineering construction management and control center to remind the communication engineering construction management and control center to investigate the transmitting power and the transmitting frequency band of each communication system and investigate the strength of lightning interference, so that the transmitting power of each communication system can be regulated in time, and the lightning interference can be prevented.
The specific structure of the noise filtering band-pass circuit is that one end of a capacitor C2 is connected with one end of a capacitor C4 and an output port of an ASK modulation receiver, the other end of a capacitor C2 is connected with one end of a resistor R1 and one end of a resistor R2, the other end of a resistor R2 is connected with one end of an inductor L1, a capacitor C1 and one end of a capacitor C3 and a non-inverting input end of an operational amplifier AR1, the other ends of the capacitor C1 and the resistor R1 are grounded, the other end of a capacitor C4 is connected with one ends of a resistor R4 and a resistor R5, the other end of the resistor R4 is connected with the other end of the inductor L1, the other end of the capacitor C3 and one end of a capacitor C5, the other ends of the resistor R5 and the capacitor C5 are grounded, and an inverting input end of the operational amplifier AR1 is connected with an output end of the operational amplifier AR 1.
The specific structure of the frequency monitoring circuit comprises that the non-inverting input end of an operational amplifier AR2 is connected with the output end of an operational amplifier AR1, the output end of an operational amplifier AR2 is connected with one end of a resistor R3, the other end of a resistor R3 is connected with a contact 3 of a relay K1, a contact 4 of a relay K1 and the inverting input end of an operational amplifier AR2 are grounded, a contact 1 of a relay K1 is connected with +5V, a contact 2 of a relay K1 is connected with one end of a resistor R7, the other end of a resistor R7 is connected with one end of a capacitor C7 and a control electrode and an anode of a thyristor Q1, the cathode of a thyristor Q1 is connected with a contact 2 and a contact 4 of a relay K3, a contact 1 of a relay K3 and the other end of a capacitor C7 are grounded, a contact 5 of a resistor K3 is grounded, a contact 3 of a relay K3 is connected with one end of a resistor R3, the other end of a resistor R3 is connected with one end of a non-inverting input end of a resistor R3 and an inverting input end of an operational amplifier 3, the other end of a resistor R3 is connected with the non-inverting input end of a relay R3, and the other end of an amplifier AR3, One end of a resistor R11 and the other end of the resistor R8 are connected with a contact 3 of a relay 2, a contact 5 of the relay 2 is grounded, a contact 4 of the relay 2 is connected with a contact 2 of the relay 2 and a cathode of a thyristor Q2, an anode of the thyristor Q2 is connected with a control electrode of the thyristor Q2, one end of a resistor R6, a contact 1 of the relay 2 and the other end of the capacitor C6 are grounded, the other end of the resistor R6 is connected with a power supply +5V, an output end of an operational amplifier AR3 is connected with the other end of a resistor R11 and the other end of a resistor R12, the other end of a resistor R12 is connected with a grid of a field effect transistor Q3 and a grid of a field effect transistor Q4, a source of the field effect transistor Q3 is connected with the power supply +5V, a drain of the field effect transistor Q84 is connected with the power supply +5V, and a drain of the field effect transistor Q3 and a source of the field effect transistor Q4 is connected with an ASK control terminal input port.
The specific structure of the average value detection circuit is that the non-inverting input terminal of the operational amplifier AR5 is connected with the source of the field effect transistor Q5, the output terminal of the operational amplifier AR1 and the drain of the field effect transistor Q7, the inverting input terminal of the operational amplifier AR5 is grounded, the output terminal of the operational amplifier AR5 is connected with one end of the resistor R18, the other terminal of the resistor R18 is connected with the gate of the field effect transistor Q5 and the gate of the field effect transistor Q7, the drain of the field effect transistor Q7 is connected with one end of the resistor R7, the other terminal of the resistor R7 is connected with one end of the inverting input terminal of the operational amplifier AR7 and one end of the resistor R7, the non-inverting input terminal of the operational amplifier AR7 is connected with one end of the resistor R7, the other terminal of the operational amplifier AR7 is connected with the ground, the output terminal of the resistor R7 and the source of the transistor Q7 and the positive pole of the diode D7, the negative pole of the diode D7 is connected with one end of the negative pole of the resistor R7, the other terminal of the resistor 7 and the other terminal of the capacitor C7, the other end of the inductor L2 is connected with one end of a resistor R33 and the non-inverting input end of an operational amplifier AR8, the other end of the resistor R33 is grounded, the output end of the operational amplifier AR8, the inverting input end of the operational amplifier AR8 and the other end of the resistor R26 are grounded, the other end of the resistor R34 is connected with the non-inverting input end of the operational amplifier AR9, the inverting input end of the operational amplifier AR9 is connected with one end of a resistor R35 and a resistor R36, the other end of the resistor R35 is grounded, and the output end of the operational amplifier AR9 is connected with the other end of a resistor R36.
The specific structure of the peak detection circuit is that the anode of the diode D2 is connected with the cathode of the diode D5 and the output end of the operational amplifier AR1, the cathode of the diode D2 is connected with the resistor R25, one end of the capacitor C8 and the emitter of the field-effect transistor Q8, the base of the field-effect transistor Q8 is connected with the anode of the diode D5, the collector of the field-effect transistor Q8 is connected with one end of the resistor R32, the other ends of the resistor R32 and the capacitor C8 are grounded, the other end of the resistor R25 is connected with one end of the resistor R29 and one end of the resistor R21, the non-inverting input end of the operational amplifier AR6, the other end of the resistor R29 is grounded, the other end of the resistor R21 is connected with +0.7V, the other end of the resistor R29 is grounded, the inverting input end of the operational amplifier AR6 is connected with one end of the resistor R15 and one end of the resistor R16, the other end of the resistor R15 is grounded, and the other end of the resistor R16 is connected with the output end of the operational amplifier AR 6.
The specific structure of the peak interference judging circuit is that one end of a resistor R22 is connected with the output end of an amplifier AR9, the other end of the resistor R22 is connected with the inverting input end of an amplifier AR7 and one end of a resistor R20, the output end of an amplifier AR7 is connected with the anode of a diode D1, the cathode of a diode D4 and the other end of a resistor R20, the non-inverting input end of an amplifier AR7 is connected with one end of a resistor R24 and a resistor R28, the other end of the resistor R24 is connected with the output end of an amplifier AR6, the anode of a diode D4 is connected with one end of a resistor R30, one end of a resistor R30 and the grid of a field-effect tube Q30, the other ends of the resistor R30 and the resistor R30 are grounded, the other end of the resistor R30 is connected with a power supply-15V, the drain of the field-effect tube Q30 is connected with a power supply +5V, the cathode of a diode D1xz.685 is connected with one end of the resistor R30, one end of the resistor R30 and the grid of the source of the field-effect tube Q30 are grounded, the drain electrode of the field effect transistor Q6 and the source electrode of the field effect transistor Q9 are connected with the input port of the STC89C51 singlechip timing counter.
When the noise filtering band-pass circuit is used specifically, the noise filtering band-pass circuit utilizes the resistors R4-R5, the capacitors C3-C5 and the inductor L1 to form a band-pass network 1, interference signals outside carrier center frequency of wireless signals of communication engineering are filtered, the resistors R1-R2 and the capacitors C1-C2 are utilized to form a band-pass network 2, and the interference signals outside the center frequency of baseband signals are filtered; the frequency monitoring circuit utilizes a power supply +5V to charge a capacitor C6 through a resistor R6, meanwhile, when a communication engineering wireless signal is in a positive half cycle, the power supply +5V is utilized to charge a capacitor C7, when the charging voltage on the capacitor C7 reaches the control electrode conduction voltage of a thyristor Q1, the charging voltage is loaded at the positive input end of an operational amplifier AR3, when the charging voltage on the capacitor C6 reaches the control electrode conduction voltage of the thyristor Q2, the charging voltage is loaded at the reverse input end of the operational amplifier AR3, a differential proportion circuit is formed by the operational amplifier AR3 and resistors R8-R11, differential proportion operation is carried out on the voltages of two input ends of the operational amplifier AR3, and if the operational amplifier AR3 outputs, the power supply +5V high level is output to an input port of an ASK control terminal; the average value detection circuit utilizes an operational amplifier AR4 to perform full-wave rectification on communication engineering wireless signals, continuous signals after full-wave rectification are charged to a capacitor C9 through a resistor R27, the capacitor C9 is discharged through a resistor R26, the resistance values of the resistor R27 and the resistor R2 are equal, and the voltage on the capacitor C9 is amplified through an in-phase proportional circuit formed by the operational amplifier AR9 and the resistors R34-R36; the peak detection circuit charges a capacitor C8 when the communication engineering wireless signal is in a positive half cycle, quickly discharges electricity through a resistor R32 when the communication engineering wireless signal is in a negative half cycle, and performs addition operation with a power supply +0.7V through an operational amplifier AR6 in real time;
the peak value interference judging circuit performs subtraction proportion operation on the output of the average value detection circuit and the output of the peak value detection circuit in real time, and if the operational amplifier AR7 has output, the +5V high-point average output of the power supply is output to the STC9C51 singlechip timing counter for counting; the count trigger mode of the STC9C51 singlechip timer counter is high level trigger, namely, the timer counts once every time a high level is received, and when the count value reaches 10 times, the STC9C51 singlechip sends a high level alarm to the ASK control terminal; when the ASK control terminal receives the high level transmitted by the peak interference judging module, the ASK control terminal sends a warning to the communication engineering construction management and control center to remind the communication engineering construction management and control center to investigate the transmitting power and the transmitting frequency band of each communication system and investigate the strength of lightning interference, so that the transmitting power of each communication system can be regulated in time, and the lightning interference can be prevented.
While the present invention has been described in further detail with reference to specific embodiments thereof, it should not be construed that the present invention is limited thereto; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (6)
1. An intelligent monitoring system for communication engineering feature recognition comprises an ASK modulation transmitter, an ASK modulation receiver, an ASK communication monitoring module, an ASK control terminal and a communication engineering construction management and control center, and is characterized in that the ASK modulation transmitter ASK modulates baseband signals in communication equipment to obtain communication engineering wireless signals, transmits the communication engineering wireless signals to the ASK modulation receiver, samples the communication engineering wireless signals received by the ASK modulation receiver, compares the frequency of the communication engineering wireless signals with the central frequency of a carrier used when the ASK modulation transmitter ASK modulates in real time, compares the peak value of the communication engineering wireless signals with the average value after noise filtering in real time, and transmits the comparison result to the ASK control terminal, and the ASK control terminal sends a warning to the communication engineering construction management and control center after receiving the comparison result transmitted by the ASK communication monitoring module, the ASK communication monitoring module comprises a noise filtering band-pass circuit, a frequency monitoring circuit, an average value detection circuit, a peak value detection circuit and a peak value interference judgment circuit;
the noise filtering band-pass circuit utilizes a resistor R4-R5, a capacitor C3-C5 and an inductor L1 to form a band-pass network 1, interference signals outside carrier center frequency of communication engineering wireless signals are filtered, a resistor R1-R2 and a capacitor C1-C2 are utilized to form a band-pass network 2, the interference signals outside baseband signal center frequency are filtered, the frequency monitoring circuit utilizes a power supply +5V to charge the capacitor C6 through the resistor R6, meanwhile, when the communication engineering wireless signals are in positive half cycle, the power supply +5V is utilized to charge the capacitor C7, when charging voltage on the capacitor C7 reaches control electrode conducting voltage of a silicon controlled rectifier Q1, the charging voltage is loaded at a positive input end of an operational amplifier AR3, when the charging voltage on the capacitor C6 reaches control electrode conducting voltage of the silicon controlled rectifier Q2, the charging voltage is loaded at a reverse input end of the operational amplifier AR3, the operational amplifier AR3 and the resistor R8-R11 form a proportional differential circuit, the differential value proportion operation is carried out on the voltage of two input ends of an operational amplifier AR3, if the operational amplifier AR3 has output, a power supply +5V high level is output to an input port of an ASK control terminal, the average value detection circuit carries out full-wave rectification on a communication engineering wireless signal by using the operational amplifier AR4, a full-wave rectified continuous signal charges a capacitor C9 through a resistor R27, a capacitor C9 discharges through the R26, the resistance value of the resistor R27 is equal to that of the resistor R2, the voltage on the capacitor C9 is amplified through an in-phase proportion circuit consisting of the operational amplifier AR9 and resistors R34-R36, the peak value detection circuit charges the capacitor C8 when the communication engineering wireless signal is in a positive half cycle, quickly discharges through the resistor R32 when the communication engineering wireless signal is in a negative half cycle, and carries out addition operation with the power supply +0.7V through the operational amplifier AR6 in real time, the peak value interference judgment circuit carries out the proportion operation on the output of the average value detection circuit and the output of the peak value detection circuit in real time, if the operational amplifier AR7 has output, the +5V high level of the power supply is output to the STC9C51 singlechip timer counter for counting.
2. The intelligent monitoring system for communication engineering feature recognition according to claim 1, wherein the noise filtering band-pass circuit comprises a capacitor C2, one end of the capacitor C2 is connected to one end of a capacitor C4 and an ASK modulation receiver output port, the other end of the capacitor C2 is connected to one ends of a resistor R1 and a resistor R2, the other end of the resistor R2 is connected to one ends of an inductor L1, a capacitor C1, one end of a capacitor C3 and a non-inverting input end of an operational amplifier AR1, the other ends of the capacitor C1 and a resistor R1 are grounded, the other end of the capacitor C4 is connected to one ends of a resistor R4 and a resistor R5, the other end of the resistor R4 is connected to one ends of an inductor L1, a capacitor C3 and a capacitor C5, the other ends of a resistor R5 and a capacitor C5 are grounded, and the inverting input end of the operational amplifier AR1 is connected to the output end of the operational amplifier AR 1.
3. An intelligent monitoring system for communication engineering feature recognition according to claim 1, wherein the frequency monitoring circuit comprises an operational amplifier AR2, the non-inverting input terminal of the operational amplifier AR2 is connected with the output terminal of the operational amplifier AR1, the output terminal of the operational amplifier AR2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with a contact 3 of a relay K1, a contact 4 of a relay K1 and the inverting input terminal of the operational amplifier AR2 are grounded, a contact 1 of a relay K1 is connected with a power supply +5V, a contact 2 of a relay K1 is connected with one end of a resistor R7, the other end of a resistor R7 is connected with one end of a capacitor C7 and a control electrode and an anode of a thyristor Q1, a cathode of the thyristor Q1 is connected with a contact 2 and a contact 4 of the relay K3, a contact 1 of the relay K3 and the other end of a capacitor C7 are grounded, a contact 5 of the relay K3 is grounded, a contact 3 of the relay K3 is connected with one end of a contact 3, and the non-inverting input terminal of a resistor R5475 and an input terminal of the amplifier 3, the other end of the resistor R10 is grounded, the inverting input end of the operational amplifier AR3 is connected with one ends of the resistor R8 and the resistor R11, the other end of the resistor R8 is connected with the contact 3 of the relay 2, the contact 5 of the relay 2 is grounded, the contact 4 of the relay 2 is connected with the contact 2 of the relay 2 and the cathode of the controllable silicon Q2, the anode of the controlled silicon Q2 is connected with the control electrode of the controlled silicon Q2, one end of a capacitor C6 and one end of a resistor R6, the contact 1 of the relay 2 and the other end of the capacitor C6 are grounded, the other end of the resistor R6 is connected with a power supply +5V, the output end of the operational amplifier AR3 is connected with the other end of the resistor R11 and the other end of the resistor R12, the other end of the resistor R12 is connected with the grid of a field-effect tube Q3 and the grid of a field-effect tube Q4, the source of the field-effect tube Q3 is connected with the power supply +5V, the drain of the field-effect tube Q4 is connected with the power supply +5V, and the drain of the field-effect tube Q3 and the source of the field-effect tube Q4 are connected with the input port of the ASK control terminal.
4. The intelligent monitoring system for communication engineering feature recognition according to claim 1, wherein the average value detection circuit comprises an operational amplifier AR5, a non-inverting input terminal of the operational amplifier AR5 is connected with a source of a field-effect transistor Q5, an output terminal of the operational amplifier AR1 and a drain of a field-effect transistor Q7, an inverting input terminal of the operational amplifier AR5 is grounded, an output terminal of the operational amplifier AR5 is connected with one end of a resistor R18, the other terminal of the resistor R18 is connected with a gate of a field-effect transistor Q5 and a gate of a field-effect transistor Q7, a drain of the field-effect transistor Q5 is connected with one end of a resistor R13, the other terminal of a resistor R13 is connected with an inverting input terminal of the operational amplifier AR4 and one terminal of a resistor R19, the non-inverting input terminal of the operational amplifier AR4 is connected with one end of a resistor R14, the other terminal of the resistor R14 is grounded, the other terminal of the output terminal of the operational amplifier AR4 is connected with the other terminal of the resistor R19 and the source of the field-effect transistor Q7 and the positive electrode of a diode D3, and one terminal of a negative terminal of a diode D3 is connected with the negative terminal of the resistor R27, the other end of the resistor R27 is connected with one end of a resistor R26, a resistor R34 and a capacitor C9, the other end of the capacitor C9 is connected with one end of an inductor L2, the other end of the inductor L2 is connected with one end of a resistor R33 and the non-inverting input end of an operational amplifier AR8, the other end of the resistor R33 is grounded, the output end of the operational amplifier AR8, the inverting input end of the operational amplifier AR8 and the other end of the resistor R26 are grounded, the other end of the resistor R34 is connected with the non-inverting input end of the operational amplifier AR9, the inverting input end of the operational amplifier AR9 is connected with one end of the resistor R35 and one end of the resistor R36, the other end of the resistor R35 is grounded, and the output end of the operational amplifier AR9 is connected with the other end of the resistor R36.
5. The intelligent monitoring system for communication engineering feature recognition of claim 1, the peak detection circuit comprises a diode D2, wherein the anode of a diode D2 is connected with the cathode of a diode D5 and the output end of an operational amplifier AR1, the cathode of a diode D2 is connected with a resistor R25, one end of a capacitor C8 and the emitter of a field-effect transistor Q8, the base of the field-effect transistor Q8 is connected with the anode of a diode D5, the collector of the field-effect transistor Q8 is connected with one end of a resistor R32, the other ends of the resistor R32 and the capacitor C8 are grounded, the other end of a resistor R25 is connected with one end of the resistor R29 and one end of the resistor R21, the non-inverting input end of the operational amplifier AR6, the other end of the resistor R29 is grounded, the other end of the resistor R21 is connected with +0.7V, the inverting input end of the operational amplifier AR6 is connected with one end of the resistor R15 and one end of the resistor R16, the other end of the resistor R15 is grounded, and the other end of the resistor R16 is connected with the output end of the operational amplifier AR 6.
6. The intelligent monitoring system for communication engineering feature recognition according to claim 1, wherein the peak interference judging circuit comprises a resistor R22, one end of the resistor R22 is connected to the output end of the amplifier AR9, the other end of the resistor R22 is connected to the inverting input end of the amplifier AR7 and one end of the resistor R20, the output end of the amplifier AR7 is connected to the anode of the diode D1, the cathode of the diode D4 and the other end of the resistor R20, the non-inverting input end of the amplifier AR7 is connected to one end of the resistor R24 and one end of the resistor R28, the other end of the resistor R24 is connected to the output end of the amplifier AR6, the anode of the diode D4 is connected to one end of the resistor R30 and the one end of the resistor R31 and the gate of the field effect tube Q9, the other end of the resistor R9 and the other end of the resistor R9 are connected to the ground, the other end of the source-15V of the drain of the field effect tube Q9, the drain of the diode D9 is connected to +5V, the cathode of the resistor R9 and the gate of the field effect tube 9, the other end of the resistor R17 is connected with a power supply +15V, the other end of the resistor R23 is grounded, the source electrode of the field-effect tube Q6 is connected with the power supply +5V, and the drain electrode of the field-effect tube Q6 and the source electrode of the field-effect tube Q9 are connected with the input port of the STC89C51 singlechip timer counter.
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