33results about How to "Improve anti-jamming performance" patented technology

The invention uses an embedded computer structure and comprises: an embedded management module, multi functional modules, a display and a touch screen controlling circuit. Each functional module is used for processing the signals from each sensor signal collecting circuit; the embedded management module is used for controlling and transmitting the data through a bus interface circuit connection functional module of high speed universal asynchronous receiver transmitter (UART); said embedded management module has an TCP/IP network interface, a RS232 or RS 485 communication circuit interface; said TCP/IP, RS 232 or RS 485 communication circuit interface are connected to the upper computer to receive the configuration of the upper computer and data collecting command; the output of the embedded management module is connected to the display and touch screen controlling circuit.

A single-phase grounding protective method of the fault current component phase ratio type generator's stator, belongs to electric technique field. The method is as follows: adopt half in quadrature wavelet as start tool; collect the zero sequence voltage component at generator terminal and neutral point side as reference electric quantity, the voltage transformer's wiring form adopt standard wiring; the modulus maximum's judging through the wavelet analyzing by which the zero sequence voltage including fundamental wave zero sequence voltage and thrice harmonic zero sequence voltage, is taken as start criterion; according to whether the phase angle ratio of the thrice harmonic voltage increment at the terminal and neutral point side meet the request, judge the whither the generator takes place single phase grounding fault at the interior of stator.

A device for obtaining the slag flow-out signal in casting steel with ladle is composed of sine wave oscillator, transconductance amplifier, peak detector, numerally controlled resistance network as voltage divider, filter amplifier, voltage comparator, bi-stable trigger, mono-stable trigger, Rs trigger and relay. Its advantages are high reliability and correctness, maximal steel output and minimal slag flowing in ladle.

The invention discloses a detection device and processing method of a high-speed motor rotor position. The method comprises the following steps: reading a most recently received rotor position signal; analyzing an angular value Theta fd from the rotor position signal; determining the compensated angle Theta cmd according to the following formula: Theta cmd= Theta fd+Omega Gamma*N*Tcnt, wherein Omega Gamma is an angular velocity determined according to the angular value obtained by analyzing previous two rotor position signals; Omega Gamma=(Theta cmd1-Theta cmd2)/t, wherein t is time interval between Theta cmd1 and Theta cmd2; N*Tcnt is time interval between the reading and the most recently receiving; N is a time delay count value, and Tcnt is the period of a time delay count pulse. According to the device and method disclosed by the invention, the interference resistance of the signal in the transmission process is improved, the signal transmission distance is increased, and the detection precision of the rotor angle is improved.

The invention discloses an infusion speed detection method and an infusion speed detection device. The infusion speed detection device comprises an infrared light emitting diode, a infrared light emitting diode drive circuit, a photosensitive triode, an optical detecting and amplifying circuit, a direct current removing circuit, a control module and a display module. The infrared light emitting diode and the phototriode triode are respectively and symmetrically arranged on two sides of a Murphy's dropper wall, and the infrared light emitting diode is turned on and turned at a certain frequency. Every time when the infrared light emitting diode is turned on, transmission lights are converted into amplified signals through the optical detecting and amplifying circuit, the control module collects the signals and calculating direct-current capacity and controls lighting intensity for the next time according to the direct-current capacity. Alternating current is acquired after the direct current is removed, period time of the alternating current can be measured to calculate dripping speed of liquid dropping, and the dripping speed is displayed on the display module. Antijamming capability of the infusion speed detection method and the infusion speed detection device for medical infusion can be improved.

The invention belongs to the technical field of radio-frequency communication, and relates to a smart antenna directional pattern synthesis algorithm for an RFID reader based on an improved particle swarm. The method comprises the following steps of: analyzing the relationship between a radiation directional pattern and the excitation amplitudes, constructing an optimized objective function of a smart antenna, taking the excitation current amplitudes of array elements as optimization parameters, setting up an optimization particle model by adopting the traditional particle swarm algorithm, and improving the local searching capability and the global searching capability of the optimization particle model by introducing a simulated annealing algorithm, so that the excitation amplitudes of various array elements are determined. By means of the method, the proper array element excitation amplitude can be selected; the radiation directional pattern can be optimized; the null characteristic can be realized; the anti-interference capability of an antenna array in a UHF RFID system can be effectively improved; and the smart antenna directional pattern synthesis algorithm disclosed by the invention has a great practical significance for improving the performance of the RFID system.

The invention provides a coupling magnetic-positioning well logging pup joint and a high-speed telemetry well logging instrument provided with the pup joint. The coupling magnetic-positioning well logging pup joint is provided with a probe part, an iron core, a coil, an analog-digital circuit processing part and a CAN bus receiving and sending module, wherein the probe part comprises a pair of permanent magnet steel with opposite magnetic poles; the iron core is located between the pair of permanent magnet steel; the coil is wound on the iron core; the analog-digital circuit processing part is used for processing a signal collected by the probe part; and the CAN bus receiving and sending module is used for sending the signal processed by the analog-digital circuit processing part to the high-speed telemetry well logging instrument through a CAN bus and receiving a signal from the high-speed telemetry well logging instrument. According to the coupling magnetic-positioning well logging pup joint and the high-speed telemetry well logging instrument provided with the pup joint, the well logging instrument is convenient to debug and high in antijamming capability, and the logging reliability and stability are improved; through the novel probe structure and the integrated processing circuit, the signal to noise ratio is increased, the overall size of the pup joint is reduced, and the capacity to accurately position casing couplings with different casing sizes and in severe well conditions of the pup joint is improved.

The invention provides a railway mobile communication time service system based on a Beidou+GPS double-signal synchronous clock. The system comprises a power module, a Beidou/GPS antenna feed part, aBeidou/GPS receiver, a main control time keeping and time service circuit and an interface module. The power module supplies power to the Beidou/GPS receiver, the main control time keeping and time service circuit and the interface module. The system further includes a main control time keeping and time service electromagnetic compatibility circuit electrically connected with the main control timekeeping and time service circuit, an interface module electromagnetic compatibility circuit electrically connected with the interface module, and a power supply module electromagnetic compatibility circuit electrically connected with the power module. A large number of designs are made in aspects such as antenna feed protection, signal interface protection and power protection, which ensures thehigh anti-interference performance of interfaces. A large number of designs are made in the interfaces and circuits, which reduces the conduction interference and radiation interference of synchronousclock source equipment and enhances the ability to resist external harmonic current transient pulse, electrostatic discharge, electric fast transient pulse groups, surge impact and other interferences.

The invention discloses an intelligent frame-type strander break line stop apparatus. The apparatus comprises: a plurality of sensors, MCUs, a wireless sub-transmitter, a wireless receiving host. Quantities of the sensors are corresponding to the quantities of payoff reels of the frame-type strander. The sensors are used for detecting whether each payoff reel rotates or not and outputting pulse signals according to rotation states of each payoff reel. The quantities of the MCUs are corresponding to the quantities of the sensors. MCUs are used for postponing outputting the output pulse signals of the sensors. The wireless sub-transmitter comprises a wireless transmitting module, wherein signal output terminals of the MCUs are connected with the wireless transmitting module through a CAM bus. The wireless receiving host comprises a wireless receiving module. And the wireless receiving host is used to receive wireless sub-transmitter signals and output alarm and stop control signals. By using the invention, intelligent monitoring of working states of the frame-type strander can be achieved, and instant alarm and stop can be performed.

The invention relates to a direct feeding shaft servo parameter optimization method based on dynamic stiffness evaluation, and a system. The direct feeding shaft is the concrete object. The method comprises the steps of confirming system performance parameter, and ensuring the normal working of a servo system of a linear motor; gradually increasing speed ring gain, and reading frequency range of each overshoot point of speed ring Bode diagram and the bandwidth data. Through the dynamic stiffness measuring method, the dynamic stiffness frequency spectrogram can be calculated, and the resonance frequency range of the servo system can be determined. With the Bode diagram, the resonance frequency range bandwidth can be determined, and a corresponding electronic filter is disposed in the servo system, and thereby the resonance frequency range can be inhibited. The servo parameter optimization method based on dynamic stiffness evaluation can effectively optimize the direct feeding shaft servo parameter.

The invention relates to the field of intelligent homes, in particular to an intelligent window. The intelligent window comprises a window body, an electric window driving device, an electronic lock, first infrared detection systems, second infrared detection systems, an infrared signal judgment system, a pressure sensor and an intelligent control system. By the arrangement of the two groups of infrared detection systems for distinguishing child and adults having height differences, opening and closing of the window can be intelligently controlled, and the intelligent window is convenient and safe; by the adoption of an anti-interference detection circuit, the detection systems can stably and accurately judge obstacles; and an intelligent control system is adopted to realize automatic opening and closing of the window, so that intelligence, safety and convenience are achieved.

The invention discloses a high-detection efficiency VCSEL (vertical-cavity surface-emitting laser) array chaotic laser radar device for driverless automobiles and belongs to the technological field ofthe application of laser radars to driverless automobiles. The device comprises a signal transmitting module, an optical path adjusting module, a signal receiving module and a data processing module;the signal transmitting module transmits optical path data to the optical path adjusting module; the optical path adjusting module transmits adjusted optical path data to the signal receiving module;and finally the data are transmitted to the data processing module. According to the signal transmitting module, a plurality of VCSELs are adopted to form array units, and then the array units form an array combination, so that the plurality of VCSEL lasers can be driven at a time, and therefore, the quantity of acquired information and measurement speed can be greatly improved, light extractionefficiency can be increased, and the detection efficiency of object detection can be improved; and the signal transmitting module is simple and compact in structure and is easy in array integration, and therefore, the size of the on-board laser radar can be greatly reduced, broadband chaotic signals also effectively realize anti-interference performance, and ranging accuracy can be improved.

The invention relates to a two-dimensional stepping nuclear magnetic resonance apparatus bed body. The two-dimensional stepping nuclear magnetic resonance apparatus bed body comprises a transverse moving stepping motor and a longitudinal moving servo moor, and further comprises a single-chip microcomputer, and a switch key, a sensor, a coder-decoder, a stepping motor driver and a servo motor driving circuit which are connected with the single-chip microcomputer; the stepping motor driver is connected with the transverse moving stepping motor in a controlling manner, the servo motor driving circuit is connected with the longitudinal moving servo motor in the controlling manner, and the coder-decoder is also connected with the longitudinal moving servo motor. The two-dimensional stepping nuclear magnetic resonance apparatus bed body provided by the invention has the advantages that the accurate control and detection of the longitudinal and transverse movement of the bed body are realized; since a main control circuit adopts an all-digital control method and anti-interference design, the anti-interference performance is very high, the control function of the bed body can be fully realized, the testing requirements of the bed body are satisfied, the stability and reliability are higher, the production cot is greatly reduced and the production period is shortened.

The invention discloses a structure for ensuring the output precision of a split-type rotary transformer. The structure comprises a main shaft, a key, a rotary transformer installation frame, a rotary transformer stator, a rotary transformer rotor, a rotary transformer installation shaft and a rear cover. The rotary transformer stator, the rotary transformer rotor and the rotary transformer installation shaft are all installed in a cavity formed by the rotary transformer installation frame and the rear cover, the rotary transformer installation shaft is connected to the inner walls of the rotary transformer installation frame and the rear cover through bearings, the rotary transformer installation shaft is connected with the main shaft through the key, and a gap exists between the end face of the rotary transformer installation shaft and the end face of the main shaft. The rotary transformer rotor is fixed on the rotary transformer installation shaft, and the rotary transformer stator is arranged on the periphery of the rotary transformer rotor. The rotary transformer installation shaft is in floating connection with the main shaft, so that the influence of fluctuation generated by the main shaft on the rotary transformer rotor can be reduced, and the dynamic precision of the rotary transformer is ensured; and the rotary transformer installation device forms a closed shell, so that the anti-interference performance of the rotary transformer is remarkably enhanced.

The invention discloses a relay protection output circuit and an output control method based on the relay protection output circuit. The relay protection output circuit comprises a CPU, an FPGA, a starting control unit, an output control unit and a relay driving unit. The CPU is connected with the FPGA through a data bus; the CPU is connected with the starting control unit through a starting control signal line; the FPGA is connected with the output control unit through an output bus and a latch signal line; the output signal of the output control unit and a master control signal sent by the CPU are transmitted to the relay driving unit; and the relay driving unit is connected with the starting control unit through a driving power source line. According to the relay protection output circuit and the corresponding output control method, the anti-interference capability of the output circuit and the reliability of the output circuit can be effectively improved.

The invention belongs to the field of radars, and discloses a sum and difference beam forming method, which includes the following steps: firstly, acquiring a zero point constraint covariance matrix of a difference beam under an ideal condition, and constructing an array error model; secondly, calculating a zero point constraint covariance mean matrix of the zero point constraint covariance matrixby using the zero point constraint covariance matrix and the array error vector, and constructing a taper matrix to taper the zero point constraint covariance mean matrix; and then constructing a lowsidelobe zero point alignment and beam constraint optimization model and a low sidelobe zero point alignment difference beam constraint optimization model, solving the model to obtain a sum beam formation optimal weight vector and a difference beam formation optimal weight vector, so as to further obtain a low sidelobe zero point alignment difference beam. According to the method, the width of the alignment zero point can be widened while the sum and difference beam sidelobe level is reduced, so that the anti-interference performance of a radar in target parameter estimation is improved.

The invention discloses a special anti-aging cable for a low wind speed wind-driven generator set. The cable comprises at least two conductors, wherein a wrapping mica tape refractory layer and an organosilane crosslinked polyethylene insulating layer are sequentially arranged at the periphery of each conductor; the at least two stranded conductors with the organosilane crosslinked polyethylene insulating layers form a core wire; a polyester tape wrapping layer and a copper tape internal shielding layer are sequentially arranged at the periphery of each core wire to form a unit core; at leasttwo unit cores and a filling layer are stranded into a cable core; a wrapping alkali-free glass fiber tape belting layer, a copper tape total shielding layer, an extruded ceramic silicone rubber lining layer, a zinc-plated steel tape armor layer and a flame-retardant jacket layer which are tightly adhered to one another are sequentially arranged outside the cable core. The cable is simple in structure, novel in design, stable in structure, and good in fireproof performance, has excellent heat resistance, ageing resistance, flame resistance, insulating property and electric performance, and hasexcellent social benefit and economic benefit and a wide market prospect.

The invention provides a frequency hopping communication transmitting system and method. The systm is mainly composed of an FPGA internal processing module and a system peripheral circuit, whewrein the FPGA internal processing module comprises a frequency hopping frequency loading control module, and a digital signal modulation processing module; and the peripheral circuit comprises a quadrature modulation circuit and a radio frequency local oscillator generating circuit. With the combination of hardware and software, the system can flexibly configure the working frequency and bandwidth. The frequency hopping communication transmitting system has the characteristics of high jump speed, high bandwidth and high frequency band. The frequency hopping communication transmitting system not onlyhas high frequency bandwidth and high hop rate, the concision and the economical benefit of the circuit design of the system are also considered, and good technical results and economic benefits are obtained.

The invention discloses an anti-compression cable used for a computer. The anti-compression cable comprises a rectangular hollow rubber skeleton. Inwards-concave semicircular grooves are respectively formed in front and rear edges of the rectangular hollow rubber skeleton, and outwards-convex semicircular grooves are respectively formed in left and right edges. Main wire cores are respectively arranged in the two inwards-concave semicircular grooves, and control wire cores are respectively arranged in the two outwards-convex semicircular grooves. The rectangular hollow rubber skeleton, the main wire cores and the control wire cores form a cable core. The main wire core is formed in such a manner that a main conductor is externally covered by a polyimide insulating layer and a copper composite band wrapping layer in sequence. The control wire core is formed in such a manner that a control conductor is externally covered by a low-smoke halogen-free polyolefin insulating layer, a non-woven fabric anti-pulling layer and an elliptical rubber skeleton in sequence. According to the invention, the interference resistance of the computer cable is greatly improved, the anti-compression performance of the cable is improved by the rectangular hollow rubber skeleton, the service lifetime of the computer cable is prolonged, the structure is simple, and the design is reasonable.

The invention provides methods and device for improving anti-interference performance of a ZigBee system and terminal equipment. Two or more antennas are set in the ZigBee system. Specifically, a radio frequency field form graph of each antenna is drawn according to receiving sensitivity of each antenna; the radio frequency field form graph of each antenna is divided into a plurality of angle intervals; through comparison of the receiving sensitivity of the radio frequency field form graph of each antenna in the same angle interval, the angle intervals with the highest receiving sensitivity are selected as valid radio frequency angle intervals; and signals received by each antenna in the selected radio frequency angle intervals are integrated as complete signals received by the antennas ofthe ZigBee system. Compared with a mode of receiving the signals through adoption of a single antenna, the mode of screening the antennas and integrating the signals received by the antennas has theadvantages that a part of interfered weak signal distribution areas in the antennas can be eliminated, transformation from weak signals to strong signals is realized, and the anti-interference performance of the ZigBee system is realized.

The invention is suitable for the technical field of data reading and writing, and provides a data reading and writing control method and a device of a memory, a circuit breaker and a medium. The data reading and writing control method of the memory is applied to the circuit breaker connected with the memory. The method comprises the following steps of: distinguishing a conventional sector from a backup sector of the memory, reading a first data set from the conventional sector to perform verification operation, if the verification result of the first data set is successful, performing new data writing operation on the memory on the basis of the first data set; If the verification result of the first data set is failed, and when the second data set is read from the backup sector and the verification result of the second data set read from the backup sector is successful, new data writing operation is carried out on the memory on the basis of the second data set. Due to the fact that different sectors do not influence each other, the anti-interference performance when data reading and writing are carried out on the memory connected with the circuit breaker is improved.

The invention discloses a special low-delay intelligent wall switch, and aims to solve the problems that an intelligent wall switch is high in delay and large in wireless control difficulty in the prior art. The special low-delay intelligent wall switch comprises a first current generating circuit, a second current generating circuit, a transconductance copying circuit, a wireless signal transceiver, a wireless control signal generator and a relay switch. A current is converted into a voltage through a field-effect transistor, and the conversion can be achieved without a resistor, so that theoutput of a transconductance voltage with low relative delay and high linearity is achieved; then the periodic opening and closing of the relay switch are periodically controlled through the transconductance voltage, and therefore an intelligent switching mode is realized by utilizing a digital circuit; meanwhile, a switch signal is transmitted to the relay switch through the wireless control signal generator, while, the control of external equipment is also received by the wireless control signal generator, so that long-range use and short-range use of the special wall switch are achieved; and the special low-delay intelligent wall switch is suitable for the aspect of professional intelligent wall switches.

According to the technical scheme of the interference alignment iterative calculation method and device, the storage medium and the computer equipment provided by the embodiment of the invention, according to the obtained initial interference subspace matrix, the obtained local channel gain matrix and the obtained transmission precoding matrix, through the pre-established optimization algorithm model, an updated interference subspace matrix is generated, and the updated interference subspace matrix is input into the base station, so that the base station generates an updated transmission precoding matrix; 1 is added to the set number n of iterations; according to the received updated interference subspace matrix output by the transceiver, through a pre-established optimization problem model, outputting an updated transmission precoding matrix, adding 1 to a set number of iterations, and if the number of iterations is equal to a preset number of times, the output interference subspace matrix and the transmitting precoding matrix are used as optimal solutions, so that the anti-interference performance of the transceiver is improved, and the robustness of interference alignment iterative calculation is improved.

The invention relates to an optical fiber debugging method of a localized protection device and a localized protection device. The method comprises: according to an Ethernet frame format, encapsulating the first debugging information of the localized protection device to form a first Ethernet data message; and/or encapsulating the second debugging information of the localized protection device toform a second Ethernet data message; sending the first Ethernet data message and/or the second Ethernet data message to the terminal through the optical fiber so that the terminal can obtain the firstdebugging information and/or the second debugging information of the localized protection device. In accordance with the Ethernet frame format, the serial port debugging information of the protectionCPU and/or the serial port debugging information of the management CPU of the localized protection device are/is encapsulated and are sent to the terminal through the optical fiber to achieve the purpose of monitoring the debugging information of the serial port of the localized protection device without the debugging serial port externally, and the optical fiber sending mode improves the bandwidth and reliability of the debugging interface.

The invention discloses a broadband data communication cable, belonging to the technical field of cables. The broadband data communication cable comprises a cable core and a sheath layer; the cable core is composed of double twisted pairs, which are formed by multiple pairs of insulation wire cores in a twisting manner; each insulation wire core is formed by a polyolefin insulation layer wrapped on a conductor in an extruded manner; the conductor is a copper conductor; a first metal shielding layer is lapped on the double twisted pairs; a water-blocking filler is filled in the cable core; and a belting layer, a second metal shielding layer and the sheath layer are sequentially arranged outside the cable core. The broadband data communication cable disclosed by the invention is reasonable in structural design; the separated shielding and overall shielding structural design is adopted; furthermore, a grounding conductor wire for introducing current into the ground is additionally arranged outside the shielding layer; due to the design, the anti-interference performance is greatly increased; excellent water-blocking performance, characteristic impedance, attenuation and loop loss indexes can be obtained; the transmission frequency is relatively high; and simultaneously, an aluminium strip is replaced by an aluminium foil, such that the better bending property is realized.

The invention discloses a voltage phase sequence self-recognition and self-adaption device and method embedded in an active power filter. The system comprises a system voltage conditioning module, a system current conditioning module, an emitted current conditioning module, a second-order low-pass filtering orthogonal module, a phase discrimination module, a second-order direct current and alternating current switching module, a phase sequence judgment module, a voltage phase sequence switching module, a system current phase sequence switching module and an emitted current phase sequence switching module. According to the invention, a second-order low-pass filter and a second-order direct current and alternating current passing and blocking module are adopted, so that the influence of harmonic waves and interference on phase sequence judgment is eliminated; hysteresis comparison is adopted as the basis of commutation judgment, it is guaranteed that commutation judgment is accurate and reliable within the normal voltage range, when the voltage is abnormal, original normal judgment is kept, and the anti-interference performance of phase sequence judgment is improved.

The invention discloses an adaptive filtering narrow-band interference suppression method with a Doppler first-order change rate, and belongs to the technical field of communication. The adaptive filtering narrow-band interference suppression method comprises the steps that: a communication system receiving end inputs a received signal to an ADC module, the signal received by the communication receiving end is subjected to analog-to-digital conversion, digital down-conversion, low-pass filtering and an extraction module, and then data obtained after extraction is transmitted to a dechirp module; fractional Fourier transform is used for estimating the initial frequency offset and a frequency offset first-order change rate of the signal, a value output by the extraction module is compensatedby using the estimated value, and the signal is subjected to interpolation and then time-domain adaptive filtering anti-interference processing, thereby realizing time-domain adaptive filtering anti-interference in the presence of the Doppler first-order change rate, and improving the anti-interference performance of the communication system. According to the adaptive filtering narrow-band interference suppression method, an LMS adaptive filtering method is utilized to carry out time-domain anti-interference on the communication signal after frequency offset and frequency offset first-order change rate compensation, the structure is simple, and the implementation is easy.

The invention discloses a type-III and type-IV collector with high MBUS load capacity. The collector comprises a 36V power supply, a single-chip microcomputer control circuit, an MBUS sending circuitand an MBUS receiving circuit. The type-III and type-IV collector has high MBUS load capacity and can adapt to site application requirements.

The invention discloses a high-precision medical feeding and weighing control module. The high-precision medical feeding and weighing control module comprises a shell, a sensor loading hook and a shell cover, the loading hook is fixed to the lower end of the sensor, and the sensor is installed in the shell; a high-precision digital acquisition board is connected with the side surface of the sensor, and an anti-overload limiting mechanism is inserted into one end of the sensor; and the shell cover abuts against the high-precision digital acquisition board and is installed on the shell. According to the high-precision medical feeding and weighing control module, a preset program can be given for a long-time administration process, manual participation is reduced, and accurate monitoring is realized.

The invention discloses a response positioning system suitable for a shunting locomotive. The response positioning system comprises a vehicle-mounted query host, a vehicle-mounted antenna and a ground transponder, wherein the vehicle-mounted query host sends carrier energy to the point transponder through the vehicle-mounted antenna to trigger the ground transponder to work; the ground transponder works to read pre-stored message data for PSK phase modulation and then sends the pre-stored message data outwards; and the vehicle-mounted query host receives the modulated message data through the vehicle-mounted antenna, decodes and restores the message data in a PSK mode, and sends the message data to the vehicle-mounted STP control system after verification. According to the system, a low-frequency-band wireless radio frequency technology is used for an on-site low-speed environment of rail shunting, data are wirelessly transmitted in a PSK phase modulation mode, the anti-interference performance is improved, phase changes can also be used as timing information to synchronize clocks of a transmitter and a receiver, and the transmission rate is doubled.