39results about How to "Solve anti-jamming" patented technology

The invention relates to a comprehensive automation integrated protecting method and a system which adopt an integrated IED to carry out automation functions such as protection, measurement and control, computation and the like of all bay units in a substation; state quantity, analog quantity and digital quantity which are output in interval by primary equipment on a process layer of the substation are respectively uploaded to the integrated IED through an ethernet switcher by a dual Ethernet (100mega / 1000mega), and the protection and automation function of the substation are realized by calculating and processing the state quantity, analog quantity and digital quantity which are output in interval respectively by the integrated IED, therefore, a spacing layer and a substation layer of the substation are unified into one layer according to IEC61850 standard, and a plurality of IEDs are integrated into one integrated protecting IED, and two same integrated IEDs are provided for hot spare for improving the reliability. The comprehensive automation integrated protecting system leads the substation integrated protecting functions to share a uniform information platform, and communication network is used for replacing control cables, thus improving the reliability of the signal transmission, further improving automation and management level and reducing comprehensive construction cost.

The invention relates to an in-situ digitization method and a device of primary equipment of a substation; the in-situ digitalizer is arranged in each gap of the primary equipment on a spacing layer of the substation; the in-situ digitalizer respectively collects the status quantity such as a switch and a disconnecting link and the like in the same gap to convert into GOOSE format message, and respectively collects mutual inductor digital quantity and analog quantity information in the same gap to convert into sampling value transport format message, and the information processed by the in-situ digitization is sent out to a local area network in a process layer of the substation; the local area network in the process layer receives the GOOSE format message for converting into the open-closed operation control of the switch and the disconnecting link. The in-situ digitization method and the device thereof of the substation share the information in a uniform information platform, and the communication network is used for replacing control cables, thus being convenient for the design, construction, extension-construction of the substation, improving the reliability, further improving automation and management level and reducing comprehensive construction cost.

The invention discloses a capacitance type sensor with a liquid electrode for measuring the liquid holdup of a multiphase flow, which comprises more than one metal plate with an insulating material coating surface, wherein each metal plate is in contact with the conductive liquid of the measured multiphase flow, and simultaneously, is connected with a measurement circuit by a cathode connector consisting of metal conductors; and the conductive liquid in the multiphase flow serves as the cathode of the capacitance type sensor, and the metal plates with the insulating material coatings form an anode. Therefore, the capacitance and sensitivity of the capacitance type sensor for measuring the liquid holdup of the multiphase flow are greatly improved, the problems of zero drift and ant-interference of the sensor are solved, simultaneously the sensor can be applied to the measurement of the multiphase flows of various flow patterns with flow pattern and size factor-independent measurement results, and is also applied to high-temperature high-pressure occasions.

The invention relates to an X-band satellite-borne phased-array antenna. The X-band satellite-borne phased-array antenna comprises an antenna cover, an installation plate and a plurality of same antenna units, wherein centers of the plurality of antenna units are arranged on the installation plate in an equilateral triangle lattice mode, the antenna cover covers the plurality of same antenna unitsand is fixed with the installation plate, each antenna unit is a multi-layer microstrip antenna and comprises a radiation patch, an antenna unit shell, an SMA coaxial connector, a grounding plate, abottom-layer dielectric plate, an upper-layer dielectric plate and a parasitic patch, an inner core of the SMA coaxial connector sequentially penetrates through the installation plate, the grounding plate and the bottom-layer dielectric layer and is connected with the radiation patch, an outer skin of the SMA coaxial connector is fixedly connected with the installation plate, the installation plate is connected with the grounding plate, the radiation patch is arranged on the center of the bottom-layer dielectric plate, the parasitic patch is arranged in the center of an upper surface of the upper-layer dielectric plate, an air medium is arranged between the bottom-layer dielectric plate and the upper-layer dielectric plate, and the peripheries of the bottom-layer dielectric plate, the grounding plate and the upper-layer dielectric plate are fixed with the antenna unit shell.

The invention provides an intelligent online monitoring device of partial discharge of a 10 kV distribution cable. The intelligent online monitoring device comprises a pulse current sensor, a pulse voltage sensor, a high-frequency signal cable and a monitoring host, wherein the pulse current sensor and the pulse voltage sensor are clamped on a shield grounding line of the 10 kV distribution cable and is used for monitoring a pulse signal of the shield grounding line; two paths of pulse signals respectively monitored by the pulse current sensor and the pulse voltage sensor are transmitted to a monitoring host respectively through high-frequency signal cables; the monitoring host analyzes the two paths of the pulse signals after the two paths of the pulse signals are monitored and judges whether partial discharge or cable interference of the 10 kV distribution cable exists. For the implementation, the intelligent online monitoring device of the partial discharge of the10 kV distribution cable, disclosed by the invention, has the advantages of creatively solving the always existed problems that inner partial discharge, outer noise and mutual interference among multiple cable circuits cannot be identified on the scene of a transformer substation when the cable insulating state is monitored by testing the pulse current on the shield grounding line of the distribution cable on line, and improving monitoring effects as well as work efficiency.

The invention provides a probe rotary type ultrasonic flaw detection device. An ultrasonic flaw detector is embedded into an ultrasonic rotary machine head in a modularized manner to form an ultrasonic flaw detection module. The ultrasonic flaw detector and the ultrasonic rotary machine head rotate together to remove relative movement between the ultrasonic flaw detector and the ultrasonic rotary machine head; and the ultrasonic flaw detector and the ultrasonic rotary machine head are fixedly connected by a coaxial cable. The ultrasonic flaw detection module can carry out digital processing and compression on a flaw detection signal and then the flaw detection signal is transmitted to a fixed transmitter in a wireless manner; and then the flaw detection signal is uploaded to a computer by the fixed transmitter to be subjected to treatment and waveform display. According to the probe rotary type ultrasonic flaw detection device disclosed by the invention, the contact problem of electric brush coupling and signal attenuation and anti-interference problems of capacitance coupling in a traditional probe rotary type ultrasonic flaw detection device are solved, the signal to noise ratio of flaw detection is improved and the rotary speed of a probe can also be improved.

The invention discloses a handheld wireless health monitor, which comprises a shell, a main control and interface module connected with the shell and an air pump, wherein the main control and interface module is connected with a blood pressure acquisition module, electrocardio, respiration, blood oxygen and pulse frequency acquisition modules, a GPS positioning module and a wireless communication module; a touch liquid crystal display screen and an operating button are connected with the main control and interface module through liquid crystal display screen and keyboard interfaces; and the air pump is connected with the blood pressure acquisition module. Electrocardio, blood pressure, blood oxygen, respiration, pulse frequency, wireless communication, GPS positioning, main control and display modules are separated into independent modules to perform research and development by adopting modularized design, and optimization design of parameters and PCB wires is performed on each module, so mutual interference of physiological parameter sampling operations is avoided, the anti-interference problem difficult to solve in a microminiaturization process of a multi-parameter monitor is successfully solved, particularly the interference of a wireless communication line on other sampling lines is avoided, and the acquired physiological data are accurate and stable.

The invention discloses a bi-directional wireless intelligent door magnetic detector. The bi-directional wireless intelligent door magnetic detector comprises a cylinder and door magnetic switch combination body, a wireless door magnetic sensor and a door magnetic alarm, wherein the wireless door magnetic sensor comprises a door magnetic sensor, door closing and opening circuits, a power module, an MCU (microprogrammed control unit), a voltage-stabilizing and filtering circuit, a Wi-Fi (wireless fidelity) module power supply control circuit, a clock circuit and a low-voltage detection circuit; an input end of the door magnetic sensor is divided into two paths, one path is electrically connected with the door closing circuit and the clock circuit, and the other path is electrically connected with the door opening circuit and the MCU through the voltage-stabilizing and filtering circuit; the voltage-stabilizing and filtering circuit and the MCU form a closed loop through the Wi-Fi module power supply control circuit and a Wi-Fi module; an output end of the door magnetic sensor is electrically connected with the MCU through the door closing circuit and the door opening circuit. The bi-directional wireless intelligent door magnetic detector solves the problems that a detector in the prior art is high in cost, large in size, complicated in circuit and high in power consumption and a battery can only support the detector for a few days, can detect the opening and closing states of doors, windows and drawers, and has the advantages of low power consumption, low cost and small size.

Disclosed is a digital burr filtering circuit for clock pins of a smart card. The burr filtering circuit which is composed by a plurality of gate circuits is added at the input end of the clock pins of the smart card, high frequency burrs on the clock pins are filtered on the promise that the duty ratio is not affected. The circuit comprises a NOND gate, a NOR gate, an inverter, a delayed component chain, and a reset-set (RS) flip-flop. According to the digital burr filtering circuit for the clock pins of the smart card, nanosecond burrs can be filtered effectively, and the problem of interference to clock pins of the smart card is solved.

The invention relates to a rotation torque sensor supplying power by the adoption of a dynamic transformer in a coupling mode. The rotation torque sensor supplying the power by the adoption of the dynamic transformer in the coupling mode comprises an elastic rotating shaft. A strain gage is adhered to the shaft body of the elastic rotating shaft; both a signal conditioning and infrared photoelectric emission circuit board and a secondary coil of the dynamic transformer are fixedly arranged on the shaft body of the elastic rotating shaft; both an F / V and V / I conversion circuit board and a primary coil of the dynamic transformer are fixedly arranged on the shell body of a shell; the primary coil of the dynamic transformer is coupled to the secondary coil of the dynamic transformer; two ends of the shell are respectively and fixedly provided with an end cover; the elastic rotating shaft is installed on end covers through bearings; both a primary oscillation drive circuit board of the dynamic transformer and an infrared receiving and pulse shaping circuit board are fixedly arranged on the end covers. The rotation torque sensor supplying the power by the adoption of the dynamic transformer in the coupling mode effectively solves the problems that a purely-photoelectric-type rotation torque sensor supplies power through photocells so as to cause large temperature rise, and meanwhile effectively solves the anti-interference problem of a purely-magneto-electricity-type rotation torque sensor, can output a plurality of types of signals such as frequency signals, current signals and voltage signals, and enlarges application ranges.

A war field satellite navigation positioning system comprises the Earth synchronic satellite, false satellite, user navigation equipment, at least four false satellite formed satellite constellation being false satellite broadcasting big power navigation signal directly generated by false satellite, through false satellite receiving Earth synchronic satellite and other satellite navigation system navigating signal, which is amplified and transmitted, for the user navigation equipment receiver to receive the false constellation signal with the change of the software. It has limited coverage of the false satellite, agile and flexible, less in investment, strong in false satellite signal, improved in satellite navigation system interference ability, improved in satellite navigation positioning precision.

The invention discloses a special five-axis manipulator for casting. The special five-axis manipulator for casting comprises a rack, and further comprises a lifting drive mechanism fixed to the rack,a lifting cross beam connected to the lifting drive mechanism and driven by the lifting drive mechanism to make vertical lifting motion, a turnover cross beam rotationally connected to the lifting cross beam, a turnover drive mechanism used for driving the turnover cross beam to rotate around a rotating shaft of the turnover cross beam, two mechanical arms arranged on the turnover cross beam and rotating along the turnover cross beam, a mold assembly drive mechanism arranged on the turnover cross beam and used for driving at least one of the mechanical arm to move along the turnover cross beamso as to enable the two mechanical arms to get close to each other, die fixing supports rotationally connected to the two mechanical arms correspondingly and used for driving a die to rotate, rotation drive mechanisms arranged on the mechanical arms and used for driving the die fixing supports to rotate around rotating shafts of the die fixing supports, and ejector mechanisms arranged on the diefixing supports and provided with ejector rods capable of moving out of the die fixing supports. The special five-axis manipulator for casting is beneficial for improving the degree of automaton of the casting process and reducing labor input in the casting process.

The invention provides a well lid linkage system. The system comprises a power supply module, a master control unit and an electromagnetic lock well lid, wherein the electromagnetic lock well lid comprises a well lid, a well ring, a lock body, an activating key and an emergency key; the activating key is inserted into the keyhole of the lock body before unlocking to trigger a wake-up switch and activate the master control unit; the master control unit is connected to APP of the mobile phone of an operator through a Bluetooth module, the unlocking authorization is verified, and the electromagnetic lock in the lock body is controlled to electrify, the lock cylinder is released from the lock tongue in the lock body, the lock cylinder can move upward along a lock cylinder hole under the elastic effect of an energy accumulating spring to complete unlocking; the control unit is used for collecting the well lid posture and underground gas density information through an inclined vibration monitor module and a gas sensor module, and reporting alarm information and periodically collected data information based on a LoRa communication module. The well lid linkage system has a simple structure, can be used for automatically monitoring unlocking authority verification, underground gas density and well lid posture, so that potential safety hazard can be effectively eliminated for undergroundoperation and inspection personnel.

The invention provides an automatic road toll system and method based on visible light communication. The system comprises a toll information storage module, a visible light communication sending module, a visible light communication receiving module and a toll processing module, the visible light communication sending module is installed on a vehicle and is connected with a headlight of the vehicle, the visible light communication receiving module is installed in a road toll station, the toll information storage module is used for storing toll information of a user of the vehicle, the visible light communication sending module is used for performing encoding and modulating according to the toll information, generating waveform data suitable for being loaded on visible light and controlling the headlight of the vehicle to send the waveform data in the form of a visible light signal, the visible light communication receiving module is used for receiving the visible light signal sent by the headlight of the vehicle, restoring the visible light signal into digital information, and sending the digital information to the toll processing module, and the toll processing module accomplishes release control and toll recording and processing. The system can completely solve the problems existing in recognition rate, interference immunity and security of ETC adopting microwave wireless transmission.

The invention discloses an intelligent integrated power supply insulation detection module which comprises a master control chip, a JTAG interface circuit, a network communication circuit, an isolating circuit, a power supply circuit, an address selecting circuit, an RS485 interface circuit and a data collecting circuit. The JTAG interface circuit, the network communication circuit, the power supply circuit, the address selecting circuit, the RS485 interface circuit and the data collecting circuit are connected with the master control chip. The isolating circuit is connected with the master control chip through the network communication circuit, and the isolating circuit is connected with an RJ45 communication interface. The RS485 interface circuit is connected with an RS485 communication interface. The data collecting circuit comprises a reference voltage circuit, a voltage superposition module, an operation amplifier amplifying module and a voltage following module. The intelligent integrated power supply insulation detection module has the advantages of being long in transmission distance, high in interference resisting capability, high in reliability and safety, simple in circuit, easy to use, practical and the like.

The invention discloses a transmitting device realizing that a liquid crystal screen is connected with a mainboard and an electronic equipment thereof, which belong to the electronic field. The transmitting device comprises the following three parts: connectors which are positioned at the both ends of the transmitting device, signal wires which are positioned between the two connectors and a metal reference plane deployed for the signal wires and positioned between the two connectors. The transmitting device of this invention has the advantages of solving the anti-jamming problem of liquid crystal screen and connecting signal transmission of the mainboard effectively, having low production difficulty and easy realization and being applicable to the interior of all the electronic equipments with liquid crystal screens.

The invention discloses a microcoaxial ultrawide band coupling device, which comprises an outer conductor of an H-shaped metal cavity structure, an H-shaped inner conductor and a photoresist support body, wherein the inner conductor grows in the outer conductor; the photoresist support body is arranged between the bottom of the inner conductor and the bottom of the outer conductor; a first supportsection and a third support section are positioned on the same straight line; a second support section and a fourth support section are positioned on the same straight line; a gap with the graduallyincreased width is formed between the first conductor and the second conductor; the first conductor is in horizontal arrangement; the second conductor is in inclined arrangement along the first conductor; a plurality of through holes are formed in the upper surface of the outer conductor; the through holes are positioned in the gap of the first conductor and the second conductor. The invention provides a high-performance signal interconnection coupling structure with the advantages of smaller size, reliable performance and wider bandwidth. High integration degree and high performance of a microwave and millimeter wave system are realized; the microwave and millimeter wave coupling circuit with a plurality of octaves in the micro dimension structure is realized.

The invention discloses a digital intermediate-frequency demodulator which is used for processing a digital intermediate-frequency signal converted from a radio frequency signal and comprises a numerical control oscillator, a lower frequency-conversion circuit, an image intermediate-frequency carrier reduction circuit and a baseband video demodulator, wherein the numerical control oscillator is used for outputting a sine value and a cosine value; the lower frequency-conversion circuit is used for outputting a first zero intermediate-frequency signal comprising a first real part signal and a first imaginary part signal according to the digital intermediate-frequency signal, the sine value and the cosine value; the image intermediate-frequency carrier reduction circuit is used for outputting a loop error signal to the numerical control oscillator and a second zero intermediate-frequency signal according to the first zero intermediate-frequency signal and a video synchronization signal; and the baseband video demodulator is used for generating a composite video signal according to the second zero intermediate-frequency signal.

The invention discloses an improved electronic transformer current collection method. The method comprises the following steps of (1) sampling through a digital-to-analog conversion chip, wherein thedigital-to-analog conversion chip adopts a 16-bit digital-to-analog conversion chip; and (2) performing data interpolation operation on sampled data by using a data interpolation algorithm in order toobtain an electric quantity waveform of an electric power system, judging whether a sampling value is valid or not according to the piecewise continuous derivability of the electric quantity waveformof the electric power system, and updating the invalid sampling value by adopting a Newton interpolation method if the sampling value is invalid. According to the method, the sampling precision and the Nyquist cut-off frequency of a collection unit are improved; and the Newton interpolation method is used for carrying out data processing on the sampled signal to filter out the low-frequency noisecaused by spectrum aliasing and the burrs of the system, so that the problems of anti-interference performance, low precision of an integral link and distortion of an electronic transformer collectorare effectively solved, the sampling precision and reliability of the electronic transformer collector are improved, and a guarantee is provided for the normal operation of a rear-end merging unit and a protection device.

The invention discloses a wireless network physiological parameter follow-up instrument, which comprises a shell, a main control and interface module, and an air pump. The main control and interface module is connected with the shell and connected with a blood pressure acquisition module, a blood oxygen and pulse frequency acquisition module and a wireless communication module; a touch liquid crystal display and an operating button are connected with the main control and interface module through a liquid crystal display screen and a keyboard interface; and the air pump is connected with the blood pressure acquisition module. Due to the adoption of modular design, the blood oxygen, blood pressure, pulse frequency, wireless transmission, and main control and display are divided into independent modules for research and development on the hardware design, and optimized design of parameters and PCB wiring is performed on each module. Therefore, mutual interference of each physiological parameter sampling work is avoided, the problem of interference of multi-parameter monitor is successfully solved, particularly the interference of the wireless communication line on other sampling lines. Therefore, the acquired physiological data is accurate and stable.

The invention discloses a distribution box shell capable of monitoring an in-box circuit. The distribution box shell comprises a distribution box door and a distribution box body, wherein one side ofthe distribution box door is provided with a viewing port; one side of the viewing port is provided with a central partition; two sides of the central partition are provided with transparent viewing plates; one side of a lower end of the viewing port is provided with a handle; one side of the handle is provided with a ventilation door; one side of the ventilation door is provided with a rotary hinge; one side of the distribution box door is provided with the distribution box body; a hinge is arranged between the distribution box door and the distribution box body; the distribution box door isrotationally connected with the distribution box body with the hinge; one side of a top end of the distribution box body is provided with a magnetism-insulating plate; one side of the magnetism-insulating plate is provided with a circuit monitoring device; one side of the circuit monitoring device is provided with an instrument room; and one side of the instrument room is provided with a first instrument chamber. A circuit monitoring device, a leakage detection device and a temperature sensing device are provided for monitoring an internal circuit of the distribution box, so that the safety performance is improved, and the property loss is reduced. The distribution box shell has high practicability, and is safe and reliable.

A corrugated plate for architectural shielding and connection structure thereof, including waveshaped templates (1) shielding connected with each other, among the waveshaped templates (1) are connected by crimping structure or clamping structure, and the adjacent waveshaped templates (1) are electrically connected. In addition to conventional crimping, spiro union, riveting, welding and other programs, the invention provided seams shielding connection structure specifically utilizes resistance welding process, the seams are shielding connected by forcipated spot welding, the connection surfacehas small contact resistance, the surface has no damage and conquers defects of screw and riveting, both reducing shielding efficiency of seams caused by oxidation corrosion and conquering defects ofcontinuous welding, that are defects of large internal stress, surface irregularity and pollution in construction process. The process is provided with reliable connection, high efficiency, low costand good construction adaptability.

The invention relates to a fault current limiter and a metal oxide varistor (MOV) wireless temperature measuring device applied to the fault current limiter. The temperature measuring device comprises an online monitoring working station, a wireless receiving unit, an acquisition and wireless transmitting unit, a current transformer and a plurality of temperature measuring probes, wherein the temperature measuring probes are connected with the acquisition and wireless transmitting unit; the current transformer is connected with the acquisition and wireless transmitting unit; the acquisition and wireless transmitting unit is in communication connection with the wireless receiving unit; and the wireless receiving unit is connected with the online monitoring working station. The fault current limiter comprises a metal oxide voltage limiter, and a plurality of straight channels are formed on a ZnO valve plate of a radiating conducing ring of the fault current limiter; the temperature measuring probes are embedded in the straight channels, and are closely attached to the ZnO valve plate; and the current transformer is connected with a high-voltage platform of the fault current limiter. The fault current limiter has a long transmission distance and a large number of temperature measuring nodes, is strong in interference resistance, and can be used for accurately monitoring the temperature of an MOV body valve plate in real time.

The invention discloses a transmitting device realizing that a liquid crystal screen is connected with a mainboard and an electronic equipment thereof, which belong to the electronic field. The transmitting device comprises the following three parts: connectors which are positioned at the both ends of the transmitting device, signal wires which are positioned between the two connectors and a metal reference plane deployed for the signal wires and positioned between the two connectors. The transmitting device of this invention has the advantages of solving the anti-jamming problem of liquid crystal screen and connecting signal transmission of the mainboard effectively, having low production difficulty and easy realization and being applicable to the interior of all the electronic equipments with liquid crystal screens.

The invention discloses a digital intermediate frequency demodulator for processing digital intermediate frequency signals converted from radio frequency signals, including a numerical control oscillator, a frequency down conversion circuit, an image intermediate frequency carrier restoration circuit and a baseband video demodulator. A numerically controlled oscillator is used to output sine and cosine values. The frequency down conversion circuit outputs a first zero intermediate frequency signal including a first real part signal and a first imaginary part signal according to the digital intermediate frequency signal, the sine value and the cosine value. The image intermediate frequency carrier restoration circuit outputs the loop error signal to the numerical control oscillator and the second zero intermediate frequency signal according to the first zero intermediate frequency signal and the video synchronization signal. The baseband video demodulator generates a composite video signal according to the second zero-IF signal.

The invention relates to the technical field of wireless communication, and relates to signal sending and receiving equipment, a symbol timing synchronization method and a system, and solves the problem of high complexity of symbol timing synchronization of terminals with low crystal oscillator precision. In a receiving device, the receiving module receives a synchronization signal including a first signal and a second signal, the first signal includes N1 generalized ZC sequences; the second signal includes N2 generalized ZC sequences, which are used to distinguish different cells or different cell group. There are at least two generalized ZC sequences with different root indices in N1+N2 generalized ZC sequences; the processing module performs the first sliding correlation operation and the second sliding correlation operation on the synchronization signal; according to N1 generalized ZC sequences and N2 generalized ZC The relationship between the sliding correlation peaks generated by the sequence during sliding correlation is used for symbol timing synchronization. Compared with the current method that requires multiple grid searches to compensate for large phase rotations, the implementation complexity is low.

The invention relates to an in-situ digitization method and a device of primary equipment of a substation; the in-situ digitalizer is arranged in each gap of the primary equipment on a spacing layer of the substation; the in-situ digitalizer respectively collects the status quantity such as a switch and a disconnecting link and the like in the same gap to convert into GOOSE format message, and respectively collects mutual inductor digital quantity and analog quantity information in the same gap to convert into sampling value transport format message, and the information processed by the in-situ digitization is sent out to a local area network in a process layer of the substation; the local area network in the process layer receives the GOOSE format message for converting into the open-closed operation control of the switch and the disconnecting link. The in-situ digitization method and the device thereof of the substation share the information in a uniform information platform, and the communication network is used for replacing control cables, thus being convenient for the design, construction, extension-construction of the substation, improving the reliability, further improvingautomation and management level and reducing comprehensive construction cost.

The invention discloses an intelligent integrated power supply insulation detection module which comprises a master control chip, a JTAG interface circuit, a network communication circuit, an isolating circuit, a power supply circuit, an address selecting circuit, an RS485 interface circuit and a data collecting circuit. The JTAG interface circuit, the network communication circuit, the power supply circuit, the address selecting circuit, the RS485 interface circuit and the data collecting circuit are connected with the master control chip. The isolating circuit is connected with the master control chip through the network communication circuit, and the isolating circuit is connected with an RJ45 communication interface. The RS485 interface circuit is connected with an RS485 communication interface. The data collecting circuit comprises a reference voltage circuit, a voltage superposition module, an operation amplifier amplifying module and a voltage following module. The intelligent integrated power supply insulation detection module has the advantages of being long in transmission distance, high in interference resisting capability, high in reliability and safety, simple in circuit, easy to use, practical and the like.

The invention discloses a LoRa-based complex shooting range environment integrated monitoring system. The system comprises a plurality of Beidou-LoRa positioning detection nodes arranged in a shootingrange, an aggregation node and a management terminal, the aggregation node and the plurality of Beidou-LoRa detection nodes are distributed in the shooting range in a LoRa wireless one-to-many communication mode. Under the condition that each of the Beidou-LoRa detection nodes (1) acquires a position parameter through Beidou satellite (4) signal processing and acquires an environment parameter, the aggregation node (2) receives the position parameter and the environment parameter and uploads the position parameter and the environment parameter to the management terminal, so that the management terminal processes the shooting range parameters and then stores and displays the shooting range parameters. According to the LoRa-based complex shooting range environment integrated monitoring system provided by the invention, the LoRa-based complex shooting range environment monitoring is adopted, so that wireless transmission distance and anti-interference performance during transmission canbe effectively improved, and wireless ad hoc network monitoring of the shooting range environment can be realized.

The invention discloses an anti-interference filtering method for a high-precision household ultrasonic water meter. The method comprises the following steps of collecting the time difference signals of downstream and countercurrent when water is stopped, calculating the absolute values of slopes between the time difference signals of adjacent sampling points, calculating a mean value Kj average of the absolute values of the slopes of the time difference signals, selecting a proper judgment threshold value delta, if Kj average is smaller than delta, using the improved smoothing filtering, if Kj average is larger than delta, using the Kalman filtering, calculating a final time difference signal delta Tfinal filtered within the whole sampling time T, and adopting the delta Tfinal to participate in the calculation for compensating or offsetting non-zero flow. The high-precision household ultrasonic water meter adopts the anti-interference filtering method for the high-precision household ultrasonic water meter to carry out anti-interference filtering. By means of the method, the influence of interference of bubbles, zero drift, impurities and the like on the flow measurement in the using process of the household ultrasonic water meter can be effectively filtered out in real time, and the flow measurement error of the household ultrasonic water meter is reduced.