Patents
Literature
Patsnap Eureka AI that helps you search prior art, draft patents, and assess FTO risks, powered by patent and scientific literature data.

39 results about "Measuring receiver" patented technology

In telecommunication, a measuring receiver or measurement receiver is a calibrated laboratory-grade radio receiver designed to measure the characteristics of radio signals. The parameters of such receivers (tuning frequency, receiving bandwidth, gain) can usually be adjusted over a much wider range of values than is the case with other radio receivers. Their circuitry is optimized for stability and to enable calibration and reproducible results. Some measurement receivers also have especially robust input circuits that can survive brief impulses of more than 1000 V, as they can occur during measurements of radio signals on power lines and other conductors.

Fixing device adapting to thermal expansion and cold contraction of pipeline

ActiveCN222186011UGood thermal expansion and contraction performanceextend your lifePipe supportsNon-rotating vibration suppressionMagnetic tension forceThermodynamics
The utility model belongs to the technical field of pipeline equipment, and particularly relates to a fixing device adapting to thermal expansion and cold contraction of a pipeline, which comprises a plurality of damping mechanisms arranged outside the pipeline along the circumference, each damping mechanism comprises a transmission rod capable of moving along the axial direction, and the transmission rods are correspondingly connected with supporting columns on the outer side of the pipeline. A supporting spring is arranged on the outer side of the transmission rod, a temperature sensor is arranged on the outer side of the pipeline, the damping mechanism is electrically connected with a temperature measuring receiver, and the temperature sensor is electrically connected with the temperature measuring receiver. The damping mechanism is arranged, the magnetorheological damping liquid is used for adapting to thermal expansion and cold contraction of the pipeline, the magnetorheological damping liquid can change the fluid resistance of the magnetorheological damping liquid under the action of magnetic force, and the resistance to the transmission rod is automatically adjusted according to the thermal expansion and cold contraction degree of the pipeline, so that the damping mechanism adapts to thermal expansion and cold contraction of the pipeline, and the service life of the pipeline is prolonged. And the magnetorheological damping liquid has flexible acting force, and the effect of adapting to thermal expansion and cold contraction of the pipeline is better than that of adapting to thermal expansion and cold contraction of the pipeline only through the elastic force of the spring.
Owner:LUOYANG ZHIDA PETROCHEM ENG

System-level HIRF radiation and conduction sensitivity comprehensive test device and method

The invention relates to the technical field of electromagnetic testing, and discloses a system-level HIRF radiation and conduction sensitivity comprehensive test device and method.The device comprises an anechoic chamber and tested equipment, the anechoic chamber is located beside a control room, and a transmitting antenna and an optical fiber cable are arranged in the anechoic chamber; wherein the transmitting antenna is used for radiating signals, the optical fiber cable is connected with the interior of the anechoic chamber and the control chamber, the control chamber is located in an external independent area, and a signal generator, a power amplifier, a directional coupler, a power meter, a measurement receiver, a photoelectric converter and a comprehensive test control system are arranged in the control chamber. According to the method, a comprehensive test environment in which radiation and conduction are synchronously applied is constructed, a test level is accurately calibrated in combination with a normalized transfer function based on full-aircraft test data, and a standardized probe layout and an anti-interference measurement link are adopted, so that high-precision sensitivity evaluation of an aircraft system in a real HIRF coupling scene is realized.
Owner:HEFEI HANGTAI ELECTROPHYSICS

Embedded local oscillator multi-stage frequency conversion vector testing device and method

The invention discloses an embedded local oscillator multi-stage frequency conversion vector testing device and method, and belongs to the technical field of testing. Only one independent local oscillator source needs to be configured in the vector network analyzer, so that the instrument cost is low; the phase difference of the main and auxiliary dual-tone signals of the reference receiver and the measurement receiver adopts the technical scheme of time-sharing synchronous measurement, and group delay and phase-frequency characteristic test of the frequency converter can be completed; the calibration mixer can be represented according to the frequency band of the tested piece, so that the test requirements of different frequency bands can be met, and the efficiency is high; the single-tone output of the main tone signal and the combined dual-tone output of the main tone signal and the consonant signal can be switched through a switch, and the amplitude-frequency and phase-frequency characteristic test of the frequency converter can be completed through mutual cooperation.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD

Wireless power transfer object detection circuit and method

In an embodiment, a method includes wirelessly transmitting power using a transmitter LC tank of a wireless power transmitter, wirelessly receiving power from the transmitter LC tank using a receiver LC tank of a wireless power receiver, interrupting wirelessly transmitting power for a slot period, during the slot period, measuring a receiver signal associated with the receiver LC tank, transmitting receiver data based on the measured receiver signal to the wireless power transmitter, determining a power loss associated with the wirelessly transmitting power based on the measured receiver signal and detecting a metallic object based on the determined power loss.
Owner:SPARK CONNECTED LLC

apparatus

An apparatus includes a transmitter; a DC-DC converter configured to generate, based on a switching schedule, an output voltage for the transmitter element; a receiver path to sample a received signal based on a sampling schedule; a noise detector to measure receiver path noise; and a controller to perform a calibration process. The calibration process includes acquiring a first measurement of receiver path noise for a first candidate offset setting that defines a first time offset applied to default timing of one of the switching schedule and the sampling schedule; acquiring a second measurement of receiver path noise for a second candidate offset setting that defines a second, different, time offset applied to default timing of the switching schedule and the sampling schedule; and selecting for use in sampling the received signal, one of the first or second candidate offset setting based on a noise-based criteria.
Owner:NXP BV

Detection device for sediment thickness in foundation engineering construction

The utility model relates to the technical field of sediment thickness detection, in particular to a sediment thickness detection device for foundation engineering construction, which comprises a base, a vertical column is fixedly connected onto the base, a mounting plate is fixedly connected to the top end of the vertical column, a through hole is formed in the mounting plate, an insertion rod is slidably connected to the through hole, and a plurality of through holes are formed in the insertion rod. An inserting rod is arranged on the mounting plate, scale marks are arranged on the inserting rod, a sliding seat is arranged on the inserting rod in a sliding and sleeving manner, an infrared distance measuring transmitter is mounted on the sliding seat, and an infrared distance measuring receiver is mounted at the bottom of the mounting plate and corresponds to the infrared distance measuring transmitter; during detection, the insertion rod is inserted into the bottom of the hole, the depth measured according to the scale marks serves as the hole bottom depth, the sliding seat abuts against the sediment surface, the depth measured through infrared distance measurement serves as the sediment top surface depth, the difference between the two data is the sediment thickness, and the detection accuracy is improved.
Owner:SHAANXI CONSTR ENG ORIENTAL BLUE OCEAN GEOTECHNICAL GRP CO LTD

Method for measuring sensitivity of receiver

A method for measuring a sensitivity of a receiver is provided. The method includes: during a first stage, controlling a signal generator to transmit an input test signal to an input node of the receiver, wherein the receiver generates an output test signal on a first output node of the receiver according to the input test signal; calculating a path loss from the input node of the receiver to the first output node of the receiver according to the input test signal and the output test signal; during a second stage, measuring an output noise power on a second output node of the receiver after a load is connected to the input node of the receiver; and calculating the sensitivity of the receiver according to the path loss and the output noise power. The load may be an antenna or a 50-ohm impedance load.
Owner:MEDIATEK INC

HIRF comprehensive sensitivity test device and test method for radiation and conduction overlapping frequency bands

The present application relates to the technical field of aircraft testing, and discloses a radiation and conduction overlapping frequency band HIRF comprehensive sensitivity test device and a test method, the device comprising a reverberation chamber and a test control system, a grounding panel and a support seat are arranged in the reverberation chamber, the support seat is arranged on the grounding panel, a device under test is placed on the upper surface of the support seat, a stirrer is arranged at a corner of the reverberation chamber, and the test control system is in bidirectional communication with a signal generation and processing system, an adaptive delay compensation system, a radiation test system, a conduction test system, an optoelectronic conversion system and a measurement receiver. The present application aligns the arrival time of a radiation field and conduction interference at the device under test through the adaptive delay compensation system, reproduces the electromagnetic energy synchronous coupling effect in the HIRF environment, combines field strength closed-loop control and conduction current monitoring feedback, synchronously applies a radiation field strength and wire bundle injection current that meet standard levels, and realizes verification of the coupling mechanism of radiation-conduction comprehensive sensitivity.
Owner:HEFEI HANGTAI ELECTROPHYSICS

Communication method between satellite-borne receiver DSPs based on EDMA and McBSP

PendingCN121485778ASatellite radio beaconingRadio transmissionReal-time dataEmbedded software design
According to the EDMA and McBSP-based inter-satellite-borne receiver DSP communication method provided by the invention, real-time data communication of an McBSP interface between DSPs is controlled by using the EDMA, and receiving and transmitting are not required to be allocated by a CPU, so that the DSP is ensured to have sufficient machine time to complete service processing functions such as navigation message processing, observed quantity calculation, positioning / orbit determination solution and inter-satellite measurement real-time processing; a multi-channel buffer serial port McBSP interface capable of being flexibly configured is adopted between the DSPs for communication, and the hardware interface design complexity is reduced on the premise that the real-time data communication rate between the DSPs is met. By means of reasonable embedded software design, full duplex communication of the McBSP is achieved only by inquiring an EDMA event completion mark in one interrupt (timer interrupt), and the software complexity is reduced while the real-time requirement of interface data communication is met; according to the method, the design of data communication hardware interfaces among the DSPs of the receiving boards in the current double-satellite measurement receiver is simplified, and the reliability and the real-time performance of data transmission among the DSPs of the multi-system and multifunctional double-satellite measurement receiver are greatly improved.
Owner:BEIJING RES INST OF TELEMETRY

Water bag preloading settlement real-time monitoring and positioning device

The invention relates to the technical field of settlement monitoring and discloses a water bag preloading settlement real-time monitoring and positioning device which comprises a movable sleeve, a positioning rod is movably sleeved with an inner cavity of the movable sleeve, a distance measuring transmitter is arranged at the top of the movable sleeve, and a distance measuring receiver is arranged at the top of the positioning rod. A moving following assembly is arranged on the upper portion of the movable sleeve. A turbine type rack and a worm are arranged between a movable sleeve and a positioning rod, when the movable sleeve is pressed to move downwards, the turbine type rack is meshed with the worm to drive the worm to rotate so as to drive a movable rod to rotate, the movable rod rotates to drive a gear to rotate, and due to the fact that the gear is meshed with a gear ring, the base and a spiral blade are driven to rotate; and when the movable sleeve moves downwards, the spiral blade can be driven to rotate, and soil adhered to the outer wall of the movable sleeve can be conveniently cleaned by utilizing the spiral blade, so that the movable sleeve can move on the outer side of the movable sleeve more smoothly, and settlement can be better monitored.
Owner:CCCC FIRST ENG CO LTD

Vector network analyzer convenient to expand

A vector network analyzer convenient to expand comprises a case, an excitation source, a first switch, a directional coupler, a measurement receiver, a reference receiver and a second switch. The first switch comprises an input end connected with an excitation source and a plurality of output ends, and part of the output ends are connected with an external excitation interface. The number of the directional couplers is multiple, the directional couplers are respectively connected with the other part of output ends of the first switch, and each directional coupler is also respectively connected with a port. The number of the measurement receivers and the number of the reference receivers are both multiple. The output end of the second switch is connected with the measurement receiver or the reference receiver, the second switch comprises two input ends, one input end is connected with the directional coupler, and the other input end of the second switch connected with the measurement receiver is connected with a measurement receiving interface; and the other input end of the second switch connected with the reference receiver is connected with a reference receiving interface. According to the utility model, the port expansion can be carried out while the built-in port can be used.
Owner:CHENGDU WEIPIN TECH CO LTD

Device for measuring depth of underground gas pipeline

The invention discloses a device for measuring the depth of an underground gas pipeline, and particularly relates to the technical field of gas pipeline measurement, the device comprises a device base, a receiver for measurement is arranged in the middle of the device base, a positioning mechanism is arranged between the device base and the receiver for measurement, and moving mechanisms are arranged at four corners of the device base. According to the long-distance underground gas pipeline depth measurement device, the whole device base is driven to move by arranging the device base and cooperatively using the moving mechanism, so that the measurement receiver is controlled to carry out auxiliary movement to carry out long-distance underground gas pipeline depth measurement, the measurement receiver does not need to be manually held to move, and the measurement precision is improved. The device is simple in structure and labor-saving, the moving direction of the device base can be flexibly changed, horizontal movement of the device base is facilitated, the device base assists in driving the measuring receiver to horizontally move, the measuring receiver is subjected to micro-distance adjustment in the horizontal direction, and the efficiency of depth measurement of the underground gas pipeline is further improved.
Owner:ZHUHAI RONGTAI MUNICIPAL ENG CO LTD

Environmentally adaptable antenna

A thermally adaptive antenna system having an antenna structure, an EM) power signal, a DC power signal, an impedance tuner, a temperature sensor in the antenna, a DC-DC conversion component, and a microcontroller. The microcontroller provides a tuning command to the impedance tuner, causing the impedance tuner to compensate for an impedance change in the antenna due to a temperature change in the antenna. An environmentally adaptive antenna system has an antenna structure, an EM power signal, a DC power signal, an EM power splitter, a directional coupler, a reference receiver, a measurement receiver, an impedance tuner, and a controller. The controller calculates antenna impedance change based on observed changes in return loss, calculates a corresponding correction to the antenna impedance, and sends a command to the impedance tuner to implement the correction to the antenna impedance.
Owner:FAIRCLOTH DANIEL

Method for measuring insertion loss of 50Hz / 400Hz passive harmonic filter

The invention discloses a method for measuring insertion loss of a harmonic filter. Measurement is carried out under the condition of rated voltage and rated current of a 50Hz / 400Hz power grid actually used by the harmonic filter, the method is simple, operation is convenient, and data are real and visual. Meanwhile, high-end equipment such as a network analyzer and a measurement receiver is not needed, and the measurement system is low in cost and reliable in operation. According to the method disclosed by the invention, the acquired analog data is transmitted after A / D conversion, so that the measured data is real and reliable and is prevented from being interfered by an electromagnetic environment. Finally, data processing is completed by means of existing mature software, a measured result is displayed in a frequency spectrum graph, the system is stable, new software does not need to be developed, time and money are saved, and efficiency is high.
Owner:SHANGHAI AIDE ELECTRONICS CO LTD

A parameter optimization method for satellite-inertial navigation depth combination receiver based on error model

This invention discloses a method for optimizing parameters for a deep-integrated satellite-inertial navigation receiver based on an error model. The method involves modeling the phase error of the deep-integrated navigation receiver, measuring the receiver's acceleration and signal-to-noise ratio, and assisting the receiver in selecting optimal loop bandwidth parameters. The method measures receiver acceleration using an inertial device and the signal-to-noise ratio using the receiving loop. Based on the deep-integrated navigation phase error model, the receiver is assisted in determining the optimal loop parameters.
Owner:NAT UNIV OF DEFENSE TECH

Communication equipment

The invention relates to a device comprising: a transmitter; a DC-DC converter configured to generate an output voltage for the transmitter element based on the switching schedule; a receiver path that samples the received signal based on the sampling schedule; a noise detector that measures receiver path noise; a controller, the controller performing a calibration process, the calibration process including: acquiring a first measurement of receiver path noise for a first candidate offset setting, where the first candidate offset setting defines a first time offset applied to a default timing of one of a switching schedule and a sampling schedule; obtaining a second measurement of receiver path noise for a second candidate offset setting, the second candidate offset setting defining a second different time offset applied to the default timing of the switching schedule and the sampling schedule; and selecting one of the first or second candidate offset settings for sampling the received signal based on a noise-based criterion.
Owner:NXP BV

A measurement frequency band expansion method and device based on a vector network analyzer

The present invention discloses a method for expanding the measurement frequency band based on a vector network analyzer, including: the original measurement signal is converted into a high-frequency measurement signal by a first frequency conversion module and output to the device under test, and the high-frequency measurement signal is restored to the original measurement signal by a third frequency conversion module and the original measurement signal is transmitted to a first reference receiver, the high-frequency measurement signal is restored to the original measurement signal by a second frequency conversion module and the original measurement signal is transmitted to a first measurement receiver, and the high-frequency measurement signal is restored to the original measurement signal by a fifth frequency conversion module and the original measurement signal is transmitted to a second measurement receiver. The present invention also discloses a device for expanding the measurement frequency band based on a vector network analyzer. The present invention utilizes the spectrum shifting effect of the frequency conversion module to shift the measurement frequency band of the vector network analyzer in the low-frequency band to a higher frequency band, realizing the expansion of the frequency band of the vector network analyzer.
Owner:SHENZHEN RAFALINK TECH CO LTD

Device and method for measuring alignment and misalignment of barrel

The invention provides a device and a method for measuring alignment and misalignment of a barrel. The invention discloses a device for measuring alignment and misalignment of a barrel, which comprises a carrier roller, a radial track, a radial pulley, a measurement transmitting mechanism, an axial track, an axial pulley, a measurement receiving mechanism and a console, a radial pulley at the end part of the cylinder drives the measurement emission mechanism to move radially, and a laser on the radial pulley is used for establishing a first reference; the axial pulley on the side portion of the cylinder drives the measurement receiving mechanism to move axially along the cylinder, and the target mirror on the measurement receiving mechanism is matched with the laser to establish a second reference. The mode of combining laser collimation and photoelectric target lens induction is adopted to replace manual visual observation and caliper measurement. And the console calculates the butt joint alignment tolerance according to the difference between the two references and the theoretical value of the barrel. The device adapts to cylinders of different specifications through the modularized track and the adjustable mechanism, realizes high-precision, automatic and continuous measurement of the alignment tolerance of the opening side of the cylinder by adopting a mode of combining non-contact laser measurement and mechanical contact, and effectively improves the detection efficiency and accuracy.
Owner:LIAONING YUANCHUANG PETROCHEMICAL TECH CO LTD

Method for predicting output thermal power of tower type photo-thermal mirror field heat absorber

The invention relates to the field of tower-type photo-thermal mirror fields, and discloses a tower-type photo-thermal mirror field heat absorber output thermal power prediction method, which comprises the following steps: on the basis of establishing a tower-type photo-thermal heat absorber thermal power prediction generalized linear mixed quantile regression model, solving unknown parameters in the model; predicting the output thermal power of the heat absorber at a certain moment in the future by using the obtained model; according to the method disclosed by the invention, the generalized linear mixed quantile model is adopted, and the model has no requirements on independent variables and dependent variables, can be suitable for data of any hierarchical structure, considers a fixed effect and a random effect, is relatively high in prediction precision, and is more stable in performance on outliers or abnormal values; quantiles are also considered, so that the integrality of the thermal power prediction effect of the heat absorber is more accurate and flexible; according to the method, various random effects including periodic factors, wind speed, temperature and the like are considered, and the precision for measuring the heat loss of the heat absorber is higher.
Owner:SEPCOIII ELECTRIC POWER CONSTR CO LTD

Indoor positioning method, device and system, electronic equipment and storage medium

The embodiment of the present application discloses an indoor positioning method, device and system, electronic device and storage medium, which are applied to a receiver, and the method includes: measuring the signal-to-noise ratio of each first pseudo-satellite among the multiple first pseudo-satellites currently tracked by the receiver, and determining the target pseudo-satellite with the highest signal-to-noise ratio from the multiple first pseudo-satellites currently tracked; obtaining the neighboring satellite list broadcast by the target pseudo-satellite with the highest signal-to-noise ratio; the neighboring satellite list includes satellite information of each neighboring pseudo-satellite of the target pseudo-satellite; selecting a second pseudo-satellite from each neighboring pseudo-satellite included in the neighboring satellite list according to the satellite information, and controlling the receiver to switch to track the second pseudo-satellite, so as to locate the receiver by tracking the second pseudo-satellite. The method provides a mechanism for efficient switching between pseudo-satellites for indoor positioning technology.
Owner:XIAN WINGTECH INFORMATION TECH CO LTD

Port expansion device

A port expansion device comprises an excitation source switch, a reference receiving switch, a measurement receiving switch and a directional coupler. The number of the excitation source switches, the number of the reference receiving switches and the number of the measurement receiving switches are all k, the number of the directional couplers is N, and N is larger than or equal to k. The excitation source switch is connected with an excitation source interface. And the reference receiving switch is connected with a reference receiver interface. And the measurement receiving switch is connected with a measurement receiver interface. The directional couplers are connected with ports, each excitation source switch is connected with at least one directional coupler, each reference receiving switch is connected with at least one directional coupler, and each measurement receiving switch is connected with at least one directional coupler. The port expansion equipment can conveniently expand the vector network analyzer, and improves the multi-port test performance.
Owner:CHENGDU WEIPIN TECH CO LTD

A receiver power linearity test apparatus and method

ActiveCN116248205BTrue power linearityLarge test dynamic rangeReceivers monitoringHigh level techniquesLinearity testingRadio frequency
The application discloses a kind of receiver power linearity testing device and method, the device includes signal source, single-pole double-throw radio frequency switch S1 and S2, amplifier A1, A2 and A3, power divider, power meter, program-controlled step attenuator T1, T2, T3 and T4 and measured receiver, the signal source is connected single-pole double-throw radio frequency switch S1, the first output of single-pole double-throw radio frequency switch S1 is sequentially connected amplifier A1 and program-controlled step attenuator T1, its second output is sequentially connected amplifier A2 and program-controlled step attenuator T2, program-controlled step attenuator T1, T2 respectively connect the first input and second input of single-pole double-throw radio frequency switch S2, its output end is connected the input of power divider, the first output of power divider is connected power meter, its second output is sequentially connected amplifier A3, program-controlled step attenuator T3, program-controlled step attenuator T4 and measured receiver.The application compared with traditional testing method, test precision is high, test dynamic range is big.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD

Wireless temperature measuring device and wireless temperature measuring system

The utility model discloses a wireless temperature measuring device and a wireless temperature measuring system. The wireless temperature measuring device comprises a host box, an antenna, a waterproof and dustproof joint, a wire protection corrugated pipe, an armored cable, a thread fixing piece and a temperature measuring probe, wherein the antenna and the waterproof and dustproof joint are connected with the host box; the wire protection corrugated pipe is connected with the waterproof and dustproof joint; the armored cable is connected with the wire protection corrugated pipe; the temperature sensor is arranged in the temperature measuring probe; the host box comprises a box body, a main board and a battery, wherein the main board and the battery are respectively arranged in the box body, and the main board is respectively and electrically connected with the temperature sensor, the antenna and the battery. A temperature sensor of the wireless temperature measuring device can measure the temperature in a severe environment, and the temperature is transmitted to the wireless temperature measuring receiver through an antenna of the wireless temperature measuring device and is transmitted to a cloud end or a user terminal; therefore, a worker does not need to use a temperature measuring device to measure the temperature in a severe environment by himself / herself.
Owner:SHENZHEN DONHE INSTR

Measurement receiver architecture for digital pre-distortion (DPD) in millimeter wave phased array environment

Described herein are phased array and transceiver systems with distortion measurement circuitry configured to obtain distortion measurements of system transmitters and provide the distortion measurements to receive beamforming components of the system. Such systems advantageously make use of existing beamforming components of the system to additionally route distortion measurements for baseband DPD processing. Such systems may not need external components to measure signals radiated by antennas of the system or dedicated paths linking system transmitters directly to a baseband processor. In some embodiments, receive beamforming components may be configured to sum distortion measurements from each transmitter to create an aggregate distortion measurement usable as representative of the average transmitter for DPD processing.
Owner:MEDIATEK INC

Geological exploration method and device based on three-dimensional reverse time migration

This application relates to the field of geological exploration, specifically to a geological exploration method and apparatus based on three-dimensional reverse-time migration. The method includes: constructing a three-dimensional velocity model of the area to be explored; performing source simulation and receiver simulation on the three-dimensional velocity model; calculating the source wavefield based on the source location and source signal, and storing the boundary source wavefield within the source wavefield; performing reverse-time reconstruction based on the receiver point location and measured receiver point signal to obtain the receiver point wavefield; reading the boundary source wavefield, and performing complete wavefield recovery based on the boundary source wavefield to obtain the recovered source wavefield; performing time-coupled integration on the recovered source wavefield and the receiver point wavefield to obtain a three-dimensional subsurface reflection structure image of the area to be explored. This application can achieve the technical effect of reducing data transmission and storage costs while improving the efficiency of geological exploration.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)

A cable coupling interference effect test system and method

The application discloses a cable coupling interference effect test system and method. The system comprises a simulation cable coupling effect test device; the simulation cable coupling effect test device comprises a simulation shielded cable, a receiver, a first cable interface box and a second cable interface box; the simulation cable coupling effect test device is laid within 10 cm of a field interference cable, and the coupling length is greater than 3 m; at least one of the first cable interface box and the second cable interface box adopts a coaxial cable test structure; the coaxial cable test structure is used for measuring the shield layer induced current and the core line coupling voltage of the simulation shielded cable; the receiver is connected with a core line coupling voltage interface and a current probe in a current test cabin to reflect the coupling interference effect level. The application can accurately obtain the shield layer induced current and the cable core line induced voltage generated in the field environment, thereby evaluating the electromagnetic coupling interference level of the field electromagnetic environment on the cable, and providing theoretical data support for field test electromagnetic compatibility.
Owner:NO 719 RES INST CHINA SHIPBUILDING IND

Method and system for monitoring performance of a radio time service

The application discloses a performance monitoring method and system of a radio time service system, and relates to the radio time service field.The method comprises the following steps: judging the working state of a monitoring receiver according to the working state information of the monitoring receiver and the state information of an external reference time frequency signal; when the working state of the monitoring receiver is normal, the monitoring receiver demodulates time service message parameters according to the received radio time service signal of the radio time service system, and measures signal quality parameters; the monitoring receiver takes a standard frequency signal as a reference input; the monitoring receiver receives the radio time service signal and outputs at least one 1PPS timing signal; a time difference measuring device measures the deviation between the 1PPS timing signal output by the receiver and a standard time 1PPS signal, and obtains a time service deviation; and the performance of the radio time service system is determined according to the time service deviation, the time service message parameters and the signal quality parameters.The application can realize unified and comprehensive monitoring of the radio time service system.
Owner:NAT TIME SERVICE CENT CHINESE ACAD OF SCI

Vectorial two- or multi-port network analyzer with only one receiver

Vectorial network analyzer with n measurement ports, where n is at least two, for measuring an n-port measurement object (315;515), with a signal generator (200;300;400) for generating an excitation signal, wherein the signal generator (200;300;400) has a mixer (202) which converts the excitation signal from an intermediate frequency plane to a measurement frequency plane, wherein only a single measuring receiver (220;320;420) is available to receive the excitation signal or the measuring signal reflected or transmitted by the object being measured (315;515), wherein the measuring receiver (220;320;420) has a first mixer (221) which converts the excitation signal from a measurement frequency plane into a first intermediate frequency plane (f IF1 ) converted, wherein the mixer (202) of the signal generator (200;300;400) and the first mixer (221) of the measuring receiver (220;320;420) are connected to a common oscillator (230;330;430) and wherein a first switching device (317,319; 519) is provided which switches the measuring receiver (220;320;420) between the signal generator (200;300;400) and the n gates of the object being measured (215;315;515).
Owner:ROHDE & SCHWARZ GMBH & CO KG

Dynamic focusing method and device for laser obstacle clearance

The invention discloses a laser obstacle clearing dynamic focusing method and device. The method comprises the following steps: controlling a focusing lens to aim at a target obstacle on a power transmission line through a control terminal, receiving initial distance information of a laser and the target obstacle input by a user, and transmitting the initial distance information as current distance information to the focusing lens; adjusting the focal length of the camera through the focusing lens according to the current distance information to carry out zooming operation, and feeding back a zooming signal to the laser after the zooming operation is adjusted; modulation laser to be output is determined through a laser according to the zoom signal; next distance information between the focusing lens and the target obstacle is determined through the distance measuring receiver according to the modulated laser echo, the next distance information serves as current distance information, the operation is repeated, and dynamic focusing on the target obstacle is achieved. According to the technical scheme, the focus position can be dynamically adjusted, high-precision distance measurement is achieved, the laser focus is accurately positioned, and the follow-up obstacle clearing precision and efficiency are improved.
Owner:BEIJING SMARTCHIP MICROELECTRONICS TECHNOLOGY CO LTD

Radiation and conduction overlapped frequency band HIRF comprehensive sensitivity test device and test method

The invention relates to the technical field of aircraft testing, and discloses a radiation and conduction overlapped frequency band HIRF comprehensive sensitivity test device and method, the device comprises a reverberation chamber and a test control system, a grounding flat plate and a supporting seat are arranged in the reverberation chamber, the supporting seat is arranged on the grounding flat plate, a tested device is placed on the upper surface of the supporting seat, and the testing control system is connected with the testing control system. The stirrer is arranged at one corner of the reverberation chamber, and the test control system is in two-way communication with the signal generation and processing system, the self-adaptive delay compensation system, the radiation test system, the conduction test system, the photoelectric conversion system and the measurement receiver. Through an adaptive delay compensation system, arrival time of a radiation field and conducted interference at a tested device is aligned, an electromagnetic energy synchronous coupling effect in an HIRF environment is reproduced, field intensity closed-loop control and conducted current monitoring feedback are combined, radiation field intensity and wire harness injection current which meet a standard level are synchronously applied, and the electromagnetic energy synchronous coupling effect in the HIRF environment is achieved. And radiation-conduction comprehensive sensitivity coupling mechanism verification is realized.
Owner:HEFEI HANGTAI ELECTROPHYSICS