36results about How to "Radiation power is small" patented technology

The invention discloses a non-contact real-time physiological signal monitoring system, which comprises a target capturing device, a tracking control unit, a biologic radar and a data acquiring and processing unit, wherein the target capturing device is used for capturing a target to obtain position information of the target; the tracking control unit is used for controlling rotation and/or pitching of a holder according to the position information of the target and making the antenna of the biologic radar above the holder align the target; the biologic radar is used for generating and transmitting a detection signal and receiving an echo signal which is reflected by the target and carries human physiological information; and the data acquiring and processing unit is used for sampling the echo signal of the biologic radar and analyzing and extracting the physiological information of the detected target from a sampled signal. In the system, a target capturing and tracking unit can ensure that the antenna of a physiological signal sensor always points at the target, so that the space range of the detected target can be expanded conveniently and the required radiant power is low.

The invention discloses a signal transmitting method and device, which are used to eliminate the interference of the transmitting signal of the transmitting antenna array on the signal received by the receiving antenna array in the same transceiver in a full-duplex wireless communication system with the millimeter wave band as the carrier frequency. Eliminates self-interference between the transmit and receive antenna arrays. The signal transmitting method includes: determining the position of the receiving antenna array; transmitting a signal through the transmitting antenna array using a beamforming technique, wherein when transmitting a signal using the beamforming technique, the position of the receiving antenna array is used as a null position, and The transmit antenna array is located in the same transceiver as the receive antenna array.

The invention relates to a method for controlling a melt process in an arc furnace (11) and signal processing component (21), program code, and data medium for performing said method. According to the method, sound signals or vibrations from the interior of the furnace container (12) are captured by means of solid-borne sound sensors (22), from which characteristic values can be derived for the distribution of melting material, melt, and slag in the furnace fill. A characteristic value SM for thermal radiation impinging on the furnace wall of the container, a characteristic value M for the lumpiness of the melting material in the volume of furnace fill, and a characteristic value MM for the change to the portion of solid melting material contacting the furnace wall are generated in priority sequence. According to the invention, the energy distribution at the electrodes (13) is changed by means of a control system (21) analyzing the characteristic values in priority sequence, such that thermal load peaks are dampened or even completely prevented. To this end, the strand impedances stored as target values are modified. If said control is not sufficient, then the thermal power of the arc is reduced as a subordinate means. A rapidly and reliably effective operating regime for the processes in the arc furnace (11) can thereby be implemented.

The invention provides an automatic identification passive tag based on visible light communication and a communication system thereof. The passive tag comprises a photocell, a tag chip connected with the photocell, and an LCD (liquid crystal display) screen connected with the output of the tag chip and used for emitting optical signals. The communication system comprises the automatic identification passive tag used for receiving light emitted by the reader-writer and reflecting information of itself to the reader-writer. A light-emitting component for emitting light to the automatic identification passive tag in the reader-writer is a light-emitting diode; and a receiving portion for receiving the optical signals reflected by the automatic identification passive tag in the reader-writer is a photoelectric detector. The automatic identification passive tag and the communication system have the advantages of bidirectional visible light communication and having a storage function; visible light communication light resources can be utilized to provide energy for an RFID (radio frequency identification) tag to realize passive work; and meanwhile, the automatic identification passive tag and the communication system also have the advantage of electromagnetic-radiation-free optical communication. The tag is long in service life, is free of cell replacement, has the functions of storage, data modification, reusability and high security, and can serve as an upgrade product of a paper-based tag.

The invention belongs to the technical field of optical communication, and particularly relates to a high-precision collimation optical antenna transmitting system capable of loading a radial radiation light source. The antenna transmitting system is designed based on the three-dimensional vector reflection theorem, and comprises an off-axis elliptical rotating curved surface secondary mirror and a confocal paraboloid primary mirror. The radial radiation light source adopted by the antenna transmitting system is a linear laser source generating radial radiation or an annular laser source generating radial radiation, and therefore the radiation power of the light source is obviously improved, and the difficulty of machining is reduced. The high-precision collimation optical antenna transmitting system capable of loading the radial radiation light source mainly solves the key technical problem of energy loss of the center of a secondary mirror of a traditional optical transmitting antenna, can improve the transmitting precision and transmission efficiency of a transmitting antenna in an optical communication system, can achieve high-precision collimating transmission approaching a diffraction limit of laser beams without pre-collimating on output beams of a semiconductor laser, and enables small integration of the optical communication transmitting system to be achieved easily.

The invention discloses an object detection system and an object detection method based on microwaves. The system comprises a microwave signal generating device, a signal transmitting device, a signalcollecting device and a microwave signal analyzing device. The microwave signal generating device is used for generating microwave signals. The signal transmitting device is used for transmitting a microwave signal to a detected object; the signal collection device is used for acquiring echo signals and sending the echo signals to the microwave signal analysis device; and the microwave signal analysis device is used for comparing the scattering signal data of the echo signal with the template signal data. The system is scientific and reasonable in design, easy to operate, convenient to use, free of radiation damage, high in safety degree, low in equipment manufacturing cost, good in microwave penetrability, small in radiation power, high in positioning precision and capable of quickly judging whether abnormal data exist in a detected object or not.

This invention discloses a microwave subsystem for the front of the weather radar receiver, including low-noise amplifier, low-transmission lines, Superconducting band-pass filters, shielded boxes, micro-refrigerator and vacuum sealed envelope. The described superconducting band-pass filter and low noise amplifier is set in separate shielding boxes. Superconducting band-pass filter output is connected through coaxial microwave links to a low-noise amplifier input. A heat transfer plate is placed above the micro-refrigerator cold head. Superconducting band-pass filter and low-noise amplifier is placed in heat transfer plate. These devices are placed inside the vacuum sealed envelope. Superconducting band-pass filter input and low-noise amplifier output, through low-temperature cables, are connected to the coaxial microwave links connectors installed on the surface of the vacuum sealed envelope. This marked the reduction of the noise, and, because of the use of high-temperature superconducting narrow-band filter, meteorological radar's anti-jamming capability gets increase as 10, 000 times.

An antenna for a RFID writer/reader includes a substrate made of a dielectric substance, and a conductor pattern formed on the substrate and including a feeding point, an open end, an extension part extending from the feeding point, and a spiral part extending spirally from an opposite end of the extension part to the open end. The spiral part includes a part juxtaposed with the extension part. Adistance along length directions of the conductor pattern, from a zero point at which a current is zero in the part upon feeding power to the feeding point, to a point at which a line perpendicular to the part and passing through the zero point intersects the extension part, is set to a second distance at which an electric field strength generated as a combination of electric fields generated at these points upon the feeding of power enables communications with the wireless tag.

Embodiments of the invention disclose an information processing method and an electronic device. The method comprises acquiring first parameter information through a first sensor of an electronic device, wherein the first parameter information represents parameter information in a device state changing process of the electronic device; making the electronic device switch into a special device state based on the first parameter information, and generating special identifier information used for identifying the special device state; controlling a second sensor of the electronic device based on the special identifier information, to make the electronic device be forbidden to execute a control strategy based on a second parameter sensed by the second sensor. The control strategy is to adjust the radiant power of a wireless signal of an antenna of the electronic device based on the second parameter information sensed by the second sensor.

A method performed by a network node for determining a beam to be transmitted to at least a first User Equipment, UE is provided. The network node determines (903) a beam to be transmitted to at leasta first UE based on an obtained average spatial profile of radiated power in each direction. The average spatial profile of radiated power is based on a spatial profile of radiated power averaged over any one or more out of a frequency interval and a time interval.

The invention discloses an SAR reducing antenna comprising an antenna part, a feeding point and a grounding point. The antenna part comprises a feeding part connected with the feeding point, a grounding part connected with the grounding point, an antenna radiation part and a regulating radiation part. The antenna radiation part comprises an equipment metal frame. The feeding part is connected withthe metal frame through a metal line so as to parasitize a resonance signal. The regulating radiation part is connected with the metal frame and used for receiving the radiation energy of the metal frame.

The invention discloses an electromagnetic parameter measurement system and method. The system includes a microwave signal generating device, an antenna array system, a signal parameter analyzing device and a display device. The antenna array system includes a transmitting antenna array and a receiving antenna array; the microwave signal generating device is used for generating microwave signals and transmitting the microwave signals to the transmitting antenna array; the transmitting antenna array is used for receiving the microwave signals and transmitting the microwave signals to a detectedobject; the receiving antenna array is used for collecting echo signals and transmitting the echo signals to the signal parameter analyzing device; the signal parameter analyzing device is used for analyzing and calculating the echo signals to obtain signal parameter data and transmitting the signal parameter data to the display device; and the display device is used for receiving and displayingthe signal parameter data. The electromagnetic parameter measurement system has the advantages of scientific and reasonable design, convenience of use, none radiation damage, high safety degree, low equipment manufacturing cost, good microwave penetrability, small radiation power, capability of quickly obtaining a measuring result and high measuring accuracy.

Sonar systems and related methods are provided. A sonar system includes a transducer array having a transverse axis and a longitudinal axis disposed perpendicularly thereto. A processor is operative to associate signals with a plurality of transducers in the transducer array so as to form a first acoustic beam, which propagates in a beam first direction and has a first beam width in a first transverse plane. The first transverse plane extends along the beam first direction and contains the transverse axis of the transducer array. A beam spreading device having a curved surface is positioned relative to the transducer array such that the first acoustic beam impinges on the curved surface. Following impingement on the curved surface, the first acoustic beam propagates in a beam second direction and has a second beam width in a second transverse plane. The second beam width is greater than the first beam width.

A WiFi-based portable unmanned aerial vehicle test system mainly comprises a test system body, an unmanned aerial vehicle and ground terminal equipment, and specifically comprises a communication module, a WiFi core module, a data storage module, a state display module, a clock module and a power supply module. Compared with a traditional unmanned aerial vehicle long-distance data transmission link, the test system mainly comprising the WiFi core module is installed on an unmanned aerial vehicle to realize close-range telemetry data and remote control instruction wireless transmission, power consumption and cost are reduced, the test system is suitable for durability tests, and the problems that a traditional test system is high in cost and too complex in preparation are solved.

The invention discloses a cross-ice medium acoustic communication waveform design method, which comprises the following steps of: acquiring sea ice acoustic parameters, establishing a frequency dispersion equation for describing elastic waveguide characteristics of an ice layer according to an elastic wave theory, solving the frequency dispersion equation to obtain a phase velocity frequency dispersion function cp, obtaining a group velocity frequency dispersion function according to the cp, and further obtaining a group velocity frequency dispersion curve; determining sound source excitation parameters serving as an information source, including an excitation frequency range and a sound energy incident angle range, and selecting a corresponding group velocity frequency dispersion function in the frequency dispersion curve according to the sound source excitation parameters; calculating a system transfer function according to the distance between the receiving end and the transmitting end based on the obtained frequency dispersion function; obtaining a system frequency domain response function based on the system transfer function and the expected pulse signal frequency domain waveform; and converting the frequency domain response function to a time domain, and inverting a time domain waveform to obtain a transmitting end waveform. According to the invention, while the communication distance and the communication reliability are improved, the communication concealment is greatly improved, and efficient, stable and concealed ice-crossing fixed-point acoustic communication is realized.

The invention provides an adaptive wave beam stable Ku wave band phased array water surface target detection system. A radar array antenna array surface of the system is connected with a T/R assembly through a traveling wave coupling feeder line, the T/R assembly is connected with a wave control extension set and a correction front end, the wave control extension set is connected with a servo extension set and a display control extension set, the correction front end is connected with the T/R assembly and the traveling wave coupling feeder line, the correction front end is connected with a transmitting channel and a receiving channel, the transmitting channel is connected with the receiving channel, the receiving channel is connected with the signal processing extension set, the signal processing extension set is connected with the wave control extension set, the servo extension set and the display control extension set, the display control extension set is connected with the wave control extension set, and a modular power supply supplies power to the detection system. The detection system is small in size, can sense carrier attitude information in real time, and is stable in adaptive wave beam.

The invention discloses electronic equipment, and belongs to the technical field of electronic equipment. The electronic equipment comprises an antenna unit, a key assembly and a capacitance detection module; the key assembly is electrically connected with the capacitance detection module, and the key assembly is separated from the antenna unit; and under the condition that the capacitance detection module detects that the capacitance value of the key assembly is greater than a preset capacitance value, the electronic equipment controls the antenna unit to reduce the radiation power.

The invention discloses an FSS coating structure and electronic equipment, and relates to the technical field of antennas. The embodiment of the invention discloses the FSS coating structure, which comprises a first dielectric substrate, an antenna and an FSS coating material, wherein the first dielectric substrate comprises a first substrate surface and a second substrate surface, and the first substrate surface and the second substrate surface are two opposite surfaces; the antenna is located on the first substrate surface; and the FSS coating material is fixed to the second substrate surface and is not in contact with the second substrate surface, and the FSS coating material is used for blocking a target direction component of a radiation electric field of the antenna. In the FSS coating structure and the electronic equipment of the invention, the FSS coating structure is arranged for the antenna, and the FSS coating material in the FSS coating structure can block the target direction component of the radiation electric field of the antenna, so that the situation that the communication quality is influenced due to the fact that the radiation power is returned to reduce the SARis avoided.