2062 results about "Electromagnetic environment" patented technology

The invention discloses a cross-platform extendible satellite dynamic simulation test system, which comprises a satellite attitude control system simulator, a flight environment and motion simulator, a satellite basic subsystem simulator and an operation monitoring and management system simulator. The satellite attitude control system simulator comprises a sensor simulator, a controller simulatorand an actuating mechanism simulator; the flight environment and motion simulator comprises an orbit and attitude dynamics resolver, a celestial body simulator, a kinematics and dynamics turntable, akinematics and dynamics translation platform, a hot vacuum and electromagnetic environment simulator and the like; and the satellite basic subsystem simulator comprises a power supply subsystem simulator and a remote measuring and remote control subsystem simulator. The operation monitoring and management system simulates functions of a satellite ground measurement and control center, such as remote measuring data decoding, remote control command generating, data archiving and analyzing and operation managing. The cross-platform extendible satellite dynamic simulation test system has strong extendibility, can be conveniently transplanted on a development and debugging platform, a distributed real-time simulation platform and an embedded semi-physical real-time simulation platform.

The invention discloses a microminiature personal combined navigation system as well as a navigating and positioning method thereof. The system is composed of a subsystem installed on the foot part of a human body and a subsystem installed on the trunk position, wherein the subsystem installed on the foot part comprises an MEMS IMU (Micro-electromechanical Systems Inertial Measurement Unit), a magnetometer and a communication module; and the subsystem installed on the trunk position comprises a satellite navigation receiver, a Doppler velometer, an atmospheric pressure altimeter, a communication module and a microminiature navigation computer. The positioning method comprises the following steps of: collecting the MEMS IMU signal; modeling and correcting the random error of a gyroscope and an accelerometer; initially aligning an MEMS inertial navigation system; resolving strapdown inertial navigation, and correcting zero speed; carrying out combined navigation of the MEMS inertial navigation system / satellite navigation receiver / the Doppler velometer / the magnetometer / and the atmospheric pressure altimeter; and displaying the navigation result in real time. The microminiature individual combined navigation system is convenient to individually carry, individual real-time gesture fixing, velocity measurement and positioning can be realized, and whole and precise real-time navigation positioning information can be provided for pedestrians, operating personnel, soldiers, rescue workers and the like in the complex electromagnetic environment.

The invention discloses a method for detecting the safe power-line-cruising distance of a UAV (unmanned aerial vehicle), which comprises the following steps of: (1) carrying out analysis according to the characteristics of electromagnetic fields of to-be-detected high-tension transmission lines in different voltage levels, and establishing corresponding electromagnetic-field simulation calculation models; (2) determining the maximum errors of electronic devices (which are susceptible to electromagnetic interference) carried by the power-line-cruising UAV and measuring devices used in the process of route planning making before routing inspection; (3) according to the requirements of the determined electronic devices on electromagnetic fields in the process of normal operating, by using the electromagnetic-field simulation calculation models of the high-tension transmission lines in different voltage levels and electromagnetic-field simulation calculation software, calculating the similarities and differences of an electromagnetic environment when the UAV has different distances away from a transmission conductor in the process of carrying out line-cruising operation on each high-tension transmission line, thereby determining the range of the safe distance between the UAV and the transmission conductor; and (4) carrying out line-cruising by the UAV according to the determined safe distance of each to-be-detected transmission line, thereby avoiding the situations that the devices run disorderly, the flight communication is interfered, a flight mission is failed, and the like caused by the electromagnetic field of the transmission conductor, and then ensuring the safety, stability and reliability of a flight.

Apparatus and methods are provided for packaging IC chips together with integrated antenna modules designed to provide a closed EM (electromagnetic) environment for antenna radiators, thereby allowing antennas to be designed independent from the packaging technology.

A munitions energy system combines various sources of energy generation with energy storage to provide power to a munition through various stages of the munition's operation. The system uses energy harvesting technologies which convert energy captured from the environment of the munition to electrical power which can be used to meet the munition's power needs. Energy can be harvested from the mechanical, thermal, and electromagnetic environment of the munition. The harvested energy can be stored by the system for later use. The system can also receive energy from conventional sources such as batteries and manage the energy from all sources to meet the power requirements of the munition.

A method for altering the electromagnetic environment of respiratory tissues, cells, and molecules comprising establishing baseline thermal fluctuations in voltage and electrical impedance at a respiratory target pathway structure depending on a state of the respiratory tissue, configuring at least one waveform to have sufficient signal to noise ratio to modulate at least one of ion and ligand interactions whereby the at least one of ion and ligand interactions are detectable in the respiratory target pathway structure above the established baseline thermal fluctuations in voltage and electrical impedance, generating an electromagnetic signal from the configured at least one waveform; and coupling the electromagnetic signal to the respiratory target pathway structure using a coupling device.

This invention discloses a performance test device and a method for radio terminal, in which, the device includes: a shield box with at least one antenna connected with an analog base station / controller out of the shield box, a test instrument connected with the being tested terminal in the box to test its radio performance, which controls the signal strength emitted to the radio terminal by the analog base station / controller, so that emitted signals can be controlled artificially, besides, tested terminals can work under single or multiple nets since one or many antennas are set in the box and shields radiation to outside test equipment and personnel and shields influence to being tested terminal from outside radiation interference of outside magnetic environment to guarantee accuracy of test result.

A multifunctional SAR complex electromagnetic environment simulator comprises an antenna and microwave subsystem, a baseband interference information generation and modulation unit, and a control display and model unit. The antenna and microwave subsystem acquires SAR emission signals, performs power regulation and multi-stage down-conversion, and outputs the signals to the baseband interference information generation and modulation unit; meanwhile, the antenna and microwave subsystem performs multi-stage up-conversion and power control on medium-frequency interference signals output by the baseband interference information generation and modulation unit and outputs to an SAR. The baseband interference information generation and modulation unit calculates baseband modulation information with multiple interference types in real time according to the control commands and parameters received, and modulates the baseband modulation information and the medium-frequency radar signals into interference signals required. According to simulation requirements, the control display and model unit calls an interference model to generate interference parameters and transmits the parameters to the baseband interference information generation and modulation unit; meanwhile, the control display and model unit monitors operating status of the whole simulator and records parameters.

An apparatus and method for altering the electromagnetic environment of ophthalmic tissues, cells, and molecules comprising, establishing baseline thermal fluctuations in voltage and electrical impedance at a target pathway structure depending on a state of at least one of the ophthalmic tissue components, configuring at least one waveform to have sufficient signal to noise ratio to modulate at least one of ion and ligand interactions whereby the at least one of ion and ligand interactions are detectable in the target pathway structure above the established baseline thermal fluctuations in voltage and electrical impedance, generating an electromagnetic signal from the configured at least one waveform, and coupling the electromagnetic signal to the target pathway structure using a coupling device whereby enhancing the release of second messengers, such as NO, growth factors and cytokines at the target pathway structure. The use of the within specified electromagnetic waveforms can have particular utility in the prophylactic treatment of ophthalmic tissue and the treatment of ophthalmic diseases such as macular degeneration, glaucoma, retinosa pigmentosa, repair and regeneration of optic nerve prophylaxis and other related diseases that respond positively to the physiological effects of these waveforms.

The invention discloses a fast electromagnetic compatibility test and diagnosis system with quantization electromagnetic interference. A receiving antenna of the system is arranged on a frequency spectrum tester, a chuck end of a current probe is clamped on a cable through which tested objects are connected, the other end of the current probe is connected on the frequency spectrum tester which is connected with a computer; and the computer is internally provided with a fast electromagnetic compatibility test and diagnosis unit. The fast electromagnetic compatibility test and diagnosis unit is used for fast testing the electromagnetic-transmitted frequency spectrum of the tested objected on site, conducting analysis and diagnosis to the electromagnetic-transmitted frequency spectrum, and judging whether the electromagnetic transmission characteristic exceeds a standard limit value or has abnormality. The fast electromagnetic compatibility test and diagnosis system has important meaning on solving the electromagnetic compatibility problem and monitoring and evaluating the electromagnetic environment.

The invention relates to the technical field of electromagnetic environment prediction, and discloses an aircraft external radio frequency electromagnetic environment prediction method and a prediction system. The system comprises an electromagnetic environmental parameter acquisition device, a data center, a simulating calculation center and a visual output terminal device. The method is that collected electromagnetic environmental parameter information of radiation sources, atmospheric environment, ground environment and sea environment is transmitted to the data center which is connected through networks by means of the electromagnetic environmental parameter acquisition device, and is stored in a data base which corresponds to the data center. The data center is connected with the simulating calculation center through a data line, and the simulating calculation center enables comprehensively predicted data model information of aircraft external radio frequency electromagnetic environment to be transmitted to the visual output terminal device which is connected through a video bus, so that the electromagnetic environment can be displayed comprehensively. According to the aircraft external radio frequency electromagnetic environment prediction method and the prediction system, an improved signal description word method is adopted to conduct modeling of aircraft external electromagnetic signal environment, and therefore the signal processing operational amount is reduced and the prediction efficiency is enhanced.

The invention discloses a neural network and fuzzy control fused electrical fire intelligent alarm method. The method comprises the following steps of: 1, acquiring a leakage current signal, current and voltage signals, an arc light signal, a temperature signal and a field electromagnetic environment parameter signal by using a sensor on site, and pre-processing signals acquired by the sensor by using a velocity detection algorithm; 2, transmitting processed data to a three-layer feedforward error counterpropagation neural network and processing, wherein the neural network is subjected to supervised learning and establishes a weight matrix in advance; and 3, transmitting electrical circuit undamage probability, electrical circuit damage probability, and electrical circuit fire probability output by the neural network to a fuzzy inference module and performing fuzzy inference to acquire a forecast result of electrical fire. In the method, the probability of the electrical fire is accurately forecast by using the advantages of advanced theories, such as neural network, fuzzy control and the like, and without depending on deep knowledge of an object, the electrical fire forecasting accuracy is obviously improved and the damage of the electrical fire can be effectively prevented and reduced.

A biosensing cell assembly having a measurement loop with a test cell having an analyte reaction zone for amperometric measurement of a response current to determine analyte concentration and a noise cancellation loop arranged to be physically exposed to the same electromagnetic environment as the measurement loop. The noise cancellation loop has a predetermined impedance within a range of the impedance of the test cell analyte reaction zone and provides a current to cancel or reduce the effects of the electromagnetic environment on the measurement loop.

The invention belongs to the technical field of communication, and relates to an interference type identification method. The interference type identification method provided by the invention can comprise the following steps: carrying out interference detection and interference identification on hostile interference in a wireless communication system in a complex electromagnetic environment; and then jointly deciding the condition of the current electromagnetic environment, and classifying the interference types in an interference environment, the existence of interference is mainly determined from two aspects of time domain and frequency domain in the interference detection; in the interference identification, feature parameters are mainly extracted from the time domain, the frequency domain and the time-frequency domain, the interference is divided into time domain interference, frequency domain interference and sweep frequency interference by using a decision tree, and a part of interference is identified in detail; and the feature parameters extracted by the interference type identification method provided by the invention have relatively good robustness and are not sensitive to the interference and noise ratio, and relatively good interference identification performance can be obtained when a decision tree judgment method having relatively low algorithm complexity is used.

The invention relates to an intelligent emitter identification method based on GRU depth convolution network, which mainly solves the problem that the serialization characteristics of radar emitter signals can not be extracted by the prior art. The scheme comprises the following steps: radar emitter signals are classified; the radar emitter signals are simulated and sliced, the sliced samples areconverted into two-dimensional real samples, and the two-dimensional real samples are normalized and divided into training sample set and test sample set, a depth neural network based on gated circulation unit GRU is constructed; the training sample set is inputted into the depth neural network, and the trained depth neural network model is obtained by optimizing the loss function, the test sampleset is input into the trained depth neural network model, and the recognition result of radar emitter signal is obtained. The invention can extract pre-and post-correlation features of signals, avoids manual feature extraction and prior knowledge, has low complexity and accurate classification result, and can be used for radar emitter identification under complex electromagnetic environment.

The invention discloses a ground test method for full-aircraft electromagnetic compatibility of a commercial aircraft. The ground test method comprises the following steps: 1, determining the ground test content of the full-aircraft electromagnetic compatibility of the commercial aircraft; 2, specifying reference paper of the ground test basis of the full-aircraft electromagnetic compatibility of the commercial aircraft; 3, classifying regional electromagnetic environments installed in onboard electronic and electrical equipment; 4, determining a limiting value of electromagnetic compatibility test data, the conducted emission acceptability limit of a cable and the radiated emission electric field intensity acceptability limit of each space; 5, determining and researching an electromagnetic compatibility test system; 6, acquiring a curve that the electric field intensities of electromagnetic environments of a test field are changed along with frequencies; 7, performing conducted emission measurement; 8, performing radiated emission measurement; and 9, performing front door coupling interference measurement. According to the ground test method for the full-aircraft electromagnetic compatibility of the commercial aircraft disclosed by the invention, the problems of aircraft electromagnetic environment classification and test part selection, full-aircraft electromagnetic interference test data criterion setting and quantitative test can be solved. The ground test method for the full-aircraft electromagnetic compatibility of the commercial aircraft is applied to analyze and determine whether a commercial aircraft developed machine meets the electromagnetic compatibility requirement and the airworthiness conformity requirement.

In order to design on-chip interconnect structures in a flexible way, a CAD approach is advocated in three dimensions, describing high frequency effects such as current redistribution due to the skin-effect or eddy currents and the occurrence of slow-wave modes. The electromagnetic environment is described by a scalar electric potential and a magnetic vector potential. These potentials are not uniquely defined, and in order to obtain a consistent discretization scheme, a gauge-transformation field is introduced. The displacement current is taken into account to describe current redistribution and a small-signal analysis solution scheme is proposed based upon existing techniques for static fields in semiconductors. In addition methods and apparatus for refining the mesh used for numerical analysis is described.

A method of obtaining an electrocardiograph (ECG) of a patient located in a turbulent electromagnetic environment. The method includes recovering an ECG signal from a patient. The signal, including added noise, is recovered near the cardiac region as the differential signal resulting from signals delivered by two electrodes forming part of a first measurement loop. The signal further consists of simultaneously recovering from the patient a second measurement signal incorporating at least the noise, as a differential signal resulting from the signals delivered by two electrodes forming part of a second measurement loop distinct from the first measurement loop. Then, the second measurement signal is added or subtracted from the first noisy ECG signal, in real time. The second measurement signal is as a function of the polarity of the noise in the second signal relative to the noise in the first noisy ECG signal. The resulting signal is processed, converted, transmitted and displayed in real time representing the ECG essentially devoid of noise.

The invention belongs to the technical field of geographic information systems and remote sensing, specifically a three-dimensional ground object automatic extraction and scene reconstruction method based on geographic information and remote sensing data. The method mainly comprises a step of ground surface coverage type detection: extracting water areas, buildings, roads and vegetation from map data and optical image data; a step of building detection and height estimation: extracting the geographic information of a building and estimating the height of the building from an optical image; a step of vegetation detection and extraction: detecting the vegetation and carrying out the height estimation through a neural network; and a step of three-dimensional ground surface model building: building a three-dimensional ground surface through a digital elevation map and carrying out the embedding of ground objects. A three-dimensional scene which is automatically reconstructed based on the global geographic information and remote sensing data is real and accurate, can be updated quickly, and can support the VR / AR application (location services and virtual guide), and also can be used as a background environment model for electromagnetic environment simulation.

The invention discloses an electromagnetic compatible digitized model system for a whole aircraft, which comprises an aircraft parameterized surface model construction unit (1), an airborne equipment position matching unit (2), an airborne equipment interference associated unit (3), an electromagnetic environment distribution unit (4) and a sensitive equipment interference source acquisition unit (5). The invention constructs the electromagnetic compatible digitized model system for the whole aircraft by adoption of the behavioral simulation method, application of the 'grey box' theory, consideration of characteristic parameters of electronic airborne equipment from the aspect of system level, neglect of various circuit details, and digitized modeling simulation of the electronic airborne equipment of the aircraft.

The invention relates to an analysis and determination method of electromagnetic environment characteristics of a war vessel. Aiming at electro-magnetic compatibility moorage of the war vessel, according to the conduction and radiation electromagnet field spectra test data tested by the existing standard code method in running trial, after classified according to identical measuring point of war vessels of the same type, the field intensity bar diagram, subsection envelope, fitting in segment of spectra are performed thereafter to calculate the characteristic fitting curve and the expression. The statistical description quantity value is determined. The peak values and the average values of subsection envelope and characteristic fitting are calculated according to the segmental terminal frequency so as to obtain the maximal and the average envelope lines, and the fitting line of frame-frequency characteristics of electric field and magnetic field of various measuring points. The invention can express in quantification the frame-frequency characteristics of the electromagnetic environment test data of the war vessel so as to obtain the quantification expression mode of the electromagnet field frame-frequency characteristics in the critical area of the war vessel. The analysis and determination method provided by the invention provides reference basis for determining electromagnetic environment characteristics of the war vessel, and researching and modifying the national relevant standard limits.

The invention discloses an intelligent cloud monitoring system and method for radio. The system comprises a frontend collection device and a cloud control center. The cloud control center comprises an operation seat subsystem, a data service subsystem and an application support subsystem. The intelligent cloud monitoring method for radio comprises the steps of completing an existing monitoring system and database; collecting and transmitting electromagnetic environment data of the monitoring system; and alarming and notifying an abnormal event. According to the system and the method, on the basis of the existing monitoring system, investment costs are relatively low, a valid coverage capability and precision of the monitoring system can be greatly improved, a radio monitoring working mode can be changed effectively, radio monitoring system architecture can be changed effectively, a support level for radio management can be greatly improved, and positive social benefits can be created.

The invention discloses a movable electromagnetic environment monitoring system based on 3S technology, comprising a vehicle-mounted computer, a central service computer, a wideband antenna, a radio-frequency receiver, a GPS receiver, a monitoring and analyzing module, an electromagnetic environment databank, a movable carrier, a vehicle-mounted GPRS module and a GPRS module on the service end. The wideband antenna, the radio-frequency receiver, the GPS receiver, the vehicle-mounted GPRS module and the vehicle-mounted computer, are mounted on the movable carrier, thereby dynamically collecting electromagnetic environment radiation data of testing points, and feeding back to the central service computer end through a GPRS network module, displaying electromagnetic environment monitoring and analyzing result on the geographic information system (GIS). The system is convenient to work out scientific estimation, and provides scientific basis for governing electromagnetic environment.

The invention discloses an intelligent article monitoring, tracking and management system based on a wireless sensor network. The system integrates multifunction of temperature monitoring, personnel identification and equipment and personnel positioning into a system, adopts connection between a wireless sensor terminal and the equipment or the personnel, acquires temperature, pressure, signal strength and other signals by a sensor, and transmits the signals to a central server by a free wireless frequency band; and the central server can judge health state of the equipment, position of the personnel and other information from the received signals, and alarms for abnormal conditions in time. The system is suitable for realizing various functions from the temperature monitoring to the personnel positioning in a hospital, a factory and other complex electromagnetic environments.

The invention discloses a double-face symmetric wired printed circuit board (PCB) type Rogowski coil. The Rogowski coil comprises a PCB board, wherein the PCB board is provided with N internal diameter guide holes and N external diameter guide holes; the N internal diameter guide holes are uniformly distributed along the circumference of radius r; the N external diameter guide holes are uniformly distributed along the circumference of radius R; the circumference of the radius r is concentric with the circumference of the radius R; wired copper foils penetrate through the N internal diameter guide holes and / or the N external diameter guide holes in turn and are symmetrically arranged on the two faces of the PCB board along the radius direction; a loop line ring is wound on a wired copper foil on one face of the PCB board; and the radius Rh of the loop line ring is greater than the radius R. The double-face symmetric wired PCB type Rogowski coil provided by the invention has the advantages of high parameter consistency, reproducibility and anti-interference capacity, guarantees a stable mutual inductance coefficient, can conveniently improve the accuracy, can be used as a current sensing head for current measurement under a complex electromagnetic environment, and is easy to produce in batches.

The present invention relates to a low-frequency electromagnetic wave magnetic shield composite material and its preparation method. It is characterized by that it adopts magnetic powder, magnetic fibre and amorphous magnetic powder as magnetic conductive filling material, uses macromolecualr resin as film-forming matter, and makes them and coupling agent and solvent undergo the processes of blending, mixing, grinding and filtering at normal temp. so as to obtain the invented composite material whose magnetic shield effect can be up to 14-15 dB, so that it possesses extensive application.

The invention discloses an air vehicle measurement and control system with upper and down links utilizing different spectrum spreading systems. An upper remote control link of the system is based on a direct spreading_frequency hopping mixed spectrum spreading system, and a down remote measuring link of the system utilizes a direct sequence spectrum spreading system. The air vehicle measurement and control system is divided into an air vehicle part and a ground station part, wherein an air vehicle parameter data collection module, a data processing module, a remote measuring data frame transmission and framing module, a direct sequence spectrum spreading modulation module, a transmitter, a transmission antenna, a receiving antenna, a radio frequency front end module, a spreading frequency hopping mixed demodulation module and a remote control data frame receiving and decoding module are carried on the air vehicle; and the ground station part comprises an instruction processing module, a remote control data frame transmission and framing module, a spreading frequency hopping mixed modulation module, a ground station transmitter, a ground station transmission antenna, a ground station receiving antenna, a ground station radio frequency front end module, a direct sequence spectrum spreading demodulation module and a remote measuring data frame receiving and decoding module. The air vehicle measurement and control system has the advantages of being strong in anti-interference performance and anti-intercept performance and suitable for being used under complex electromagnetic environments.

The invention provides a low-voltage concentrated meter reading communication detection device comprising an analog circuit and a digital circuit. The analog circuit comprises power frequency isolation signal coupling, band-pass filtering, carrier signal power detection, a program-controlled local oscillator, AD sampling, a concentrator module, an analog meter module and a power control module. The digital circuit comprises system data memory, an embedded computer software and hardware system, buttons, a display module and a non-carrier communication port. The low-voltage concentrated meter reading communication detection device is an onsite portable tool which is light and convenient and easy to use so that measurement of communication functions, communication capacity and onsite power line electromagnetic environments can be effectively performed on various acquisition devices like a special transformer acquisition terminal, a concentrator, a collector and an electric energy meter, and a local communication problem of an acquisition terminal system can be solved onsite.