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134 results about "Measuring receiver" patented technology
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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.
Systems and methods for receiving multiple input, multiple output signals for test and analysis of multiple-input, multiple-output systems
InactiveUS20080084951A1Spatial transmit diversityPolarisation/directional diversityFrequency changerIntermediate frequency
Systems and methods for receiving MIMO signals for testing and analyzing operation of MIMO communications devices. Examples of systems and / or methods for receiving MIMO signals include a measuring receiver with N RF paths consisting of N downconverters. Each downconverter achieves a frequency shift of the input MIMO signal equal to a shifting frequency of a first intermediate frequency (IF) plus a delta determined by the signal bandwidth multiplied by an integer number between 1 and N. The shifted N MIMO signals are combined to generate one combined analog MIMO signal. An analog to digital converter converts the combined analog MIMO signal to a stream of digital samples where the samples may be tested and analyzed with metrics on signals communicated in a MIMO environment. Example systems and method for receiving MIMO signals may also be implemented as a MIMO channel emulator such that samples generated by the ADC may be upconverted to output copies of the original signals to a receiver DUT, for example.
Owner:AGILENT TECH INC
Radio frequency control for communication systems
InactiveUS20050078743A1Low costHigh resolutionModulated-carrier systemsRadio transmissionDigital dataLocal oscillator signal
The present invention provides for a system and method for improvement of radio transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with a remote communication unit. In the local unit the received radio signal is down-converted, and converted to complex baseband digital samples by an analog-to-digital converter. A downlink digital phase rotator applies a fine frequency shift to the samples in accordance with a receiver frequency offset command. The resultant baseband signal is used by the data demodulator and by a receiver frequency error estimator to obtain receiver frequency errors. A data modulator generates baseband complex samples which are shifted in carrier frequency by an integrated uplink digital phase rotator in accordance with a transmitter frequency offset command. The modulated samples are then converted by a digital-to-analog converter and upconverted in frequency for radio transmission to the remote unit. The local oscillator signals for both upconverter and downconverter are phase locked to a reference frequency generated by a VCXO. An automatic frequency control (AFC) function nulls the transmitter and receiver frequency error by the frequency adjustment commands to the uplink and downlink phase rotators or to the VCXO digital-to-analog converter (VCXO DAC) by feedback control principals based on measured receiver frequency error. During frequency track mode when communications between local and remote units are possible, the AFC only adjusts radio frequency via phase rotator commands and the VCXO command remains fixed, thereby avoiding communications performance degradation by VCXO frequency quantization error due to the VCXO DAC. The AFC adjusts VCXO frequency only during a preliminary acquisition mode prior to data communications, or to back out excessively large frequency offsets accumulated in the downlink and uplink phase rotators during track mode. When a VCXO adjustment is made in track mode, phase rotator adjustments are simultaneously applied to cancel the errors in transmitter and receiver radio frequencies caused by the step change due to VCXO frequency quantization thereby mitigating VCXO frequency quantization noise.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Radio frequency control for communication systems
InactiveUS6985705B2Low costHigh resolutionPulse automatic controlModulated-carrier systemsDigital dataLocal oscillator signal
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Method and system for measuring receiver mixer iq mismatch
InactiveUS20070123188A1TransmissionAngle demodulation by oscillations conversionTransceiverFrequency mixer
Owner:AVAGO TECH INT SALES PTE LTD
Method for identifying a receiver in a hearing aid
ActiveUS8855323B2Simple and time-efficient identificationPrevent wrong actionDeaf aid adaptationHearing aidEngineering
Owner:WIDEX AS
Agricultural machinery automatic driving control system based on Beidou navigation and method thereof
The invention provides an agricultural machinery automatic driving control system based on Beidou navigation and a method thereof, and belongs to the technical field of agricultural machinery control. The agricultural machinery automatic driving control system comprises a differential reference station, an automatic driving instrument and a visual sensor. The differential reference station comprises a first measurement antenna which is connected with a first measurement receiver. A transmitting radio is connected on the first measurement receiver. The automatic driving instrument comprises a vehicle-mounted navigator, a vehicle-mounted display controller, an electric steering wheel controller and a guide wheel angle sensor. The vehicle-mounted navigator is connected with the vehicle-mounted display controller. The output ports of the electric steering wheel controller and the guide wheel angle sensor are connected with the vehicle-mounted display controller. The vehicle-mounted display controller comprises a graphic processing module. The visual sensor is connected with the graphic processing module. Obstacle avoidance of the agricultural machinery can be guaranteed through control of the guide wheel angle and omitted cultivation of the agricultural machinery can be reduced so that cultivation quality of the agricultural machinery can be enhanced, and the agricultural machinery automatic driving control system can be used for control work of agricultural machinery automatic driving cultivation.
Owner:YANGZHOU UNIV
Method and system for measuring receiver mixer IQ mismatch
Aspects for measuring receiver mixer IQ mismatch in a transceiver are described. The measuring includes providing a training signal for a receiver mixer, the training signal having periodic, uncorrelated I and Q signals. A phase mismatch in the receiver mixer is determined from IQ correlation over a unit period. A gain mismatch in the receiver mixer is determined from a power estimate of both I and Q signal for the unit period.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Transform-domain feedback signaling for MIMO communication
ActiveUS20090252251A1Avoid less flexibilitySimple designDiversity/multi-antenna systemsTransmission monitoringControl signalMimo communication
The present invention relates to a control method for a communication network that has a transmitter with an array of transmit antennas and that has at least one receiver communicating with the transmitter. The receiver performs a channel measurement for a receive antenna of the receiver using a signal transmitted from the transmitter to the receiver. The receiver further determines channel coefficients for each of an array of transmit antennas at the transmitter from an output of the channel measurement, and then applies a linear, reversible and orthogonal transform to the channel coefficients, thus ascertaining channel component coefficients indicative of the individual weight of respective channel components in a transform domain. The receiver then selects one or more channel components in the transform domain and communicates to the transmitter a control signal indicative of one or more preferred channel components or a magnitude of one or more channel component coefficients, or both, in quantized form. The transmitter receives the control signal and constructs a beam pattern in the transform domain using the information received from the receiver.
Owner:KONINKLJIJKE PHILIPS NV
Method and apparatus providing calibration technique for RF performance tuning
InactiveCN101189804AAttenuate out-of-band interferenceReduce power consumptionReceivers monitoringRadio transmissionAudio power amplifierResonance
A method is disclosed for operating a RF receiver of a communications equipment, as is circuitry for implementing the method. The method includes, while operating under the control of a data processor of the communications equipment, generating a calibration signal; injecting the calibration signal into a low noise amplifier (LNA) of the RF receiver; measuring a downconverted response of the receiver at a plurality of different frequencies of the calibration signal, or measuring the downconverted response of the receiver at a plurality of different LNA tuning combinations using a fixed calibration frequency, and at least one of tuning a resonance frequency of at least one LNA resonator based on the measured downconverted response so as to compensate at least for variations in component values that comprise the at least one resonator, or adjusting the linearity of the receiver.
Owner:NOKIA CORP
Novel GNSS receiver incline measuring system and method
ActiveCN109269471AImprove work efficiencyReduce labor intensityNavigation by speed/acceleration measurementsSatellite radio beaconingGyroscopeMeasurement point
The invention provides a novel GNSS receiver incline measuring system. The system comprises an inertia measuring unit, a GNSS receiver, a CPU and a centering rod, wherein the inertia measuring unit comprises a three-axis accelerometer and a three-axis gyroscope, the GNSS receiver is used for measuring the position and velocity of an antenna phase position center of the receiver, the CPU is used for data processing and responsible for the synchronization of GNSS receiver data and inertia measuring unit data, and the centering rod is a physical medium of the position transmission of the GNSS receiver and a measuring point. By means of the system, reliable, consecutive and high-precision incline measuring without correction is achieved to take the place of an incline measuring method based onan electronic compass technology and a 'shaking' technology, the working efficiency of field measurement of the GNSS receiver is improved, and the working intensity of a measuring worker is reduced.
Owner:SHANGHAI HUACE NAVIGATION TECH
Method and apparatus for monitoring transmission quality
InactiveUS6967998B1Improves channel throughputMonitor transmission qualityError detection/prevention using signal quality detectorNetwork traffic/resource managementEngineeringTransmission quality
In wireless communications, it is necessary to monitor the transmission quality of communications channels to maintain system performance and operation. The invention provides a way of measuring bit error rates in channels at the receiver, without diminishing channel throughput by inserting quality monitoring data into the signal at the transmitter.
Owner:QUALCOMM INC
Agricultural machinery automatic driving control device based on Beidou navigation
ActiveCN105911985AHigh positioning accuracyRealize the planApparatus for force/torque/work measurementPosition/course control in two dimensionsSteering wheelAgricultural engineering
The invention provides an agricultural machinery automatic driving control device based on Beidou navigation, and belongs to the technical field of agricultural machinery control. The agricultural machinery automatic driving control device comprises a differential reference station and an autopilot. The differential reference station is provided with a first measuring receiver which is connected with a first measuring antenna. The first measuring receiver is connected with an emission radio station. The autopilot comprises a vehicle-mounted navigator, a vehicle-mounted display controller, an electric steering wheel controller and a guide wheel controller. The vehicle-mounted navigator is connected with the vehicle-mounted display controller. The steering wheel steering controller is respectively connected with the vehicle-mounted display controller and the guide wheel controller. Agricultural machinery position information and soil cultivation resistance parameters can be acquired, and the measured parameters are stored and cultivation area is automatically planned so that the device can be applied to the control work of an agricultural machinery automatic driving cultivation route.
Owner:YANGZHOU UNIV
Computing I/Q Impairments at System Output Based on I/Q Impairments at System Input
ActiveUS20140286382A1Reducing I/Q impairmentTransmitters monitoringReceivers monitoringLocal oscillatorIterative method
Systems and methods for measuring transmitter and / or receiver I / Q impairments are disclosed, including iterative methods for measuring transmitter I / Q impairments using shared local oscillators, iterative methods for measuring transmitter I / Q impairments using intentionally-offset local oscillators, and methods for measuring receiver I / Q impairments. Also disclosed are methods for computing I / Q impairments from a sampled complex signal, methods for computing DC properties of a signal path between the transmitter and receiver, and methods for transforming I / Q impairments through a linear system.
Owner:NATIONAL INSTRUMENTS
Method for measuring communication port
InactiveCN102510313AInterference is fast and accuratePrecise positioningTransmission monitoringCoaxial cableRadio reception
The invention relates to a method for measuring a communication port. The method is used for restraining disturbance on a vehicular radio antenna from wire harness conduction coupling and space radiated disturbance coupling in an electronic device and a subsystem of the whole vehicle, so as to ensure that a mounted radio receiving device can receive normal radio signals. The method comprises the following steps: connecting a test cable with the tail end of a coaxial cable of a vehicular communication antenna port; scanning by a measuring receiver in a required frequency scope; measuring radiation emission of a vehicular device and cables related to the vehicular device; and estimating the disturbed degree of a vehicular radio under a certain condition by an antenna port test limit wire according to a test result. The method provided by the invention is especially suitable for the test for the disturbance of the vehicle to a broadband communication system after being installed.
Owner:CHINA NORTH VEHICLE RES INST
Method for testing shielding effectiveness of cable shielding layer
InactiveCN104391199AWide test frequency bandImprove efficiencyElectrical testingShielded cableEngineering
The invention discloses a method for testing shielding effectiveness of a cable shielding layer. The method is characterized in that a testing device is placed into a shielded room, a tested device of an unshielded cable and a shielded cable are connected on the testing device, the radiated electric field of the tested device is received by an antenna, the distance between the antenna and a cable to be tested ranges from 0.8m to 1.5m, the testing frequency of a testing system is 2MHz-18GHz, a radiated electric field value received by the antenna is finally inputted to a computer through a measuring receiver, stored and processed. The method has the advantages of wide testing frequency, high efficiency, low cost, high accuracy, easiness in implementation, convenience in measurement and the like.
Owner:JIANGXI HONGDU AVIATION IND GRP
Method and apparatus for image registration improvements in a printer having plural printing stations
ActiveUS20050179764A1Maximize accuracyRecording apparatusPrinting mechanismsTemperature controlGrating
A thermal printer apparatus has a plurality of print stations for recording image information onto a receiver moving past the print stations. An adjustable-speed receiver drive mechanism is adapted to advance the receiver along the path. A plurality of sensors adapted to detect the temperature of the receiver and other surfaces along the path. A controller adjusts the speed of the drive mechanism as a function of the detected temperatures so as to effect a shim of the average raster line pitch of the printer to compensate for changes in the temperature of the receiver. An empirical model of receiver speed as a function of measured receiver temperature is used in software to predict receiver speed during printing.
Owner:KODAK ALARIS INC
RTK measuring receiver tilt measurement method
ActiveCN106595583AGet computational precisionSatellite radio beaconingIncline measurementMeasurement pointCentimeter
The invention provides an RTK measuring receiver tilt measurement method. The method comprises the following steps that 1, the bottom of a centering rod is fixed, tilting and shaking are conducted, and then measurement is conducted; 2, on the basis of the above-mentioned measurement, a measurement point sequence, a measurement point tilted sequence, a measuring rod length and an antenna phase center height are obtained; 3, on the basis of a numerical value obtained through measurement, a positioning quality target and geodetic coordinates of the points to be measured are obtained; 4, whether the positioning quality target meets the requirement or not is judged, weather measurement is finished or not is determined. According to the method, the positions of the points to be measured are calculated according to the positions and inclination angles of the receiver antenna phase center, the centering rod length and the like when a certain number of tilt measurements are conducted, and for centimetre-sized RTK, when the number of observed values is enough, the centimetre-sized position calculation precision can be obtained.
Owner:SHANGHAI HUACE NAVIGATION TECH
Multilayered medium material multi-parameter measurement method and system
InactiveCN101334269ASimple designPhase-affecting property measurementsUsing optical meansRefractive indexComputational physics
The invention provides a method for simultaneously obtaining the multiple electromagnetic parameters of a multilayer material by measuring for one time; by the experiment measurement of an electromagnetic reflecting angular spectrum of one time, accurate determination simultaneously to the thickness and the refractive index of each layer of a multilayer dielectric material is realized by optimal calculation according to an angle when the reflecting angular spectrum is at minimum reflection (or maximal reflection). In the invention, electromagnetic wave energy entering a certain working frequency of a multilayer material system is transmitted and reflected on each material interface, the reflecting electromagnetic wave energy of an incident surface is received by a measuring receiver. The angle of incident wave and the angle of the receiver are adjusted continuously so as to lead the reflecting energy to reach an extremum. The incident angle is supposed to be a given value, optimal search is carried out to the parameters of multilayer material by utilizing the simulated annealing algorithm, and the result is the result of the detected multiple parameters. The method can be applied in the fields of remote sensing parameter inversion and the measurement of plasma on a laser surface, etc., and also can be popularized to the field of the multiple parameter measurement of acoustical multilayer material, and is characterized by high efficiency and accuracy.
Owner:BEIHANG UNIV
Forwarding type GNSS dynamic measurement accuracy testing and evaluating method
ActiveCN106855631AEliminate the effects ofGuaranteed reliabilitySatellite radio beaconingTime alignmentMobile station
The invention relates to a forwarding type GNSS dynamic measurement accuracy testing and evaluating method, which comprises the steps of selecting a real motion carrier of a GNSS measurement system to be tested to act as a motion testing platform, building a satellite navigation signal forwarding environment on the motion carrier by using a satellite navigation signal repeater, and enabling real-time position information acquired by a mobile station of the GNSS measurement system to be tested and a comparative measurement receiver to be equivalent to a mounting part of a forwarding antenna; then designing a carrier motion environment, laying a reference station network, and enabling the comparative measurement receiver to be closer to a reference station so as to ensure acquisition of a position reference value with higher accuracy; acquiring a real-time position reference value of the mobile station of the GNSS measurement system to be tested under a time alignment condition by using test data interpolation after a dynamic test, and comparing a real-time measurement value of the mobile station of the GNSS measurement system with the reference value to acquire the dynamic measurement accuracy of the GNSS measurement system to be tested.
Owner:中国人民解放军63891部队
Self-adapting data window size smoothing method for positioning result of global positioning system
The invention discloses a smoothing method of self-adaptive data window length used for a GPS positioning result, and relates to the global satellite positioning and navigation field, such as a GPS. The method comprises the following steps: self-adaptively determining the smoothly sliding window length by a measured receiver speed, and smoothing by a corresponding smoothing method. The self-adaptive data window length smoothing method of the positioning result is applicable to the internal of baseband processing chips of any types of GPS receivers, as well as a receiver system with the GPS baseband processing chip as a core. The method can obviously enhance the positioning precision, reduce errors, and obviously reduce positioning result delay, and ensure real-time property of the positioning result. Compared with other methods, the method is simpler and more easily used, thus greatly reducing complexity and facilitating combination with other smoothing methods.
Owner:中微智创(北京)软件技术有限公司
Sense finding device for solid base line broad band microwave radiation source and sense finding method thereof
InactiveCN101109799AEasy to implementFast direction findingDirection findersPhase differencePosition angle
The invention provides a stereo baseline wide-band direction-finding device and method for microwave radiation source comprising 6 antenna array elements, a hi-frequency assembly, an instantaneous frequency-measuring receiver, a frequency mixer, a mid-frequency amplifier, a local oscillation source, a digital receiver and a signal processor. The info on phase of the microwave radiation source got through the antenna array elements is used to calculate the phase difference between antenna array elements; the position angle and pitch angle of the microwave radiation source are calculated based on the relationship between the phase difference of the microwave radiation source and the position angle / pitch angle of the microwave radiation source; the 2D direction-finding fuzzy is worked out by using the results of the antenna array elements. In this way, the concurrent no-fuzzy hi-accuracy direction finding of the position angle and pitch angle of the microwave radiation source are realized in a wideband range; and the flexible arrangement form of the antenna array elements allows reasonable arrangement of the location of the antenna array elements so as to meet the requirement for application in cases with limited volume of antenna tray or with limited position for the antenna array elements.
Owner:HARBIN ENG UNIV
Path-measuring receiver and method for processing base-band signal
InactiveCN101031126ASolve the problem of coverage optimizationHighly integratedRadio/inductive link selection arrangementsTransmissionBroadcast channelsDisplay device
The invention comprises: a RF receiver used for receiving TD-SCDMA signals through antenna and outputting I and Q difference baseband signals; a baseband signal processing device used for measuring each kind of network performance parameter based on said IQ difference signals; a parameter display device used for real-time displaying each network performance parameter. The invention also reveal a method thereof, which comprises: a) converting the downlink signals into digital format; b) making synchronization to find the initial location of TD-SCDMA frame and optimal sampling point; c) extracting the Midamble data of time slot 0 to estimate the character of radio channel; d) using radio channel character and Midamble data to make multi-path combination, de-spread and de-scramble process, and to output the broadcast channel data; e) decoding the broadcast data to form bit data; f) measuring each network performance parameters.
Owner:广州钟鼎木林网络技术有限公司
Integrated noise parameter measuring device and method
ActiveCN108802510AReasonable designGood effectNoise figure or signal-to-noise ratio measurementMeasurement deviceMeasurement precision
The invention discloses an integrated noise parameter measuring device and method and belongs to the technical field of electronic test. The integrated noise parameter measuring device comprises an Sparameter measuring module, an electronic impedance tuner Zx, a noise measuring module and a local oscillator; the S parameter measuring module comprises a signal source, reference coupler CR1, reference coupler CR2, reference measuring receiver R1, reference measuring receiver R1, port coupler CP1, port coupler CP2, measuring receiver A and measuring receiver B; the noise measuring module comprises switch circuit SW and noise power measuring circuit NR; the port coupler CP1 is connected with port 1, and the port coupler CP2 is connected with port 2. The S parameter measuring module, the noisemeasuring module, the electronic impedance tuner and the local oscillator are integrated in a case; noise parameters, noise coefficient and S parameter can be precisely and quickly measured at the same time for a test piece; the device and method have the advantages of good calibration convenience, high measuring precision, high speed and the like.
Owner:THE 41ST INST OF CHINA ELECTRONICS TECH GRP
Measuring the DC properties of a signal path between transmitter and receiver
ActiveUS8437385B1Reducing I/Q impairmentTransmitters monitoringResonant long antennasSoftware engineeringLocal oscillator
Systems and methods for measuring transmitter and / or receiver I / Q impairments are disclosed, including iterative methods for measuring transmitter I / Q impairments using shared local oscillators, iterative methods for measuring transmitter I / Q impairments using intentionally-offset local oscillators, and methods for measuring receiver I / Q impairments. Also disclosed are methods for computing I / Q impairments from a sampled complex signal, methods for computing DC properties of a signal path between the transmitter and receiver, and methods for transforming I / Q impairments through a linear system.
Owner:NATIONAL INSTRUMENTS
Holographic grating exposed interference fringe phase shifting and locking device
ActiveCN103698983AEffective mobilityEffective phase lockDiffraction gratingsPhotomechanical exposure apparatusManufacturing technologyGrating
The invention discloses a holographic grating exposed interference fringe phase shifting and locking device and belongs to a device related in the technical field of spectrums. A technical scheme is that the holographic grating exposed interference fringe phase shifting and locking device comprises a light source laser device, a plane mirror, a beam-splitting plate, an acousto-optic frequency shifter, a fixed-frequency acousto-optic modulator, an optical grating substrate, phase measuring receivers and a controller. After light source laser is split, two light beams are subjected to frequency shifting by the fixed-frequency acousto-optic modulator and the acousto-optic frequency shifter, so that part of emergent light is subjected to interference to form exposed interference fringes, and the other part of the emergent light respectively enters the two phase measuring receivers to obtain the phase difference of coherent light beams by adopting a heterodyne method; the controller controls the drive frequency of the acousto-optic frequency shifter to keep the phase difference constant. The device disclosed by the invention can accurately carry out effective movement control and phase locking on phases of the holographic-grating exposed interference fringes, and has significance in improving a holographic grating manufacturing technology and the process level.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Electromagnetic radiation emission real-time measurement system for high-speed train
ActiveCN102818954ARealize electromagnetic radiation experimentAchieving electromagnetic radiation experimental limitsElectrical testingWireless transmissionElectromagnetic interference
The invention provides an electromagnetic radiation emission real-time measurement system for a high-speed train and relates to the technical field of the wireless electric signal and electromagnetic radiation emission measurement and the interference source positioning. The system comprises a vehicle-mounted measurement subsystem, a ground measurement subsystem, a vehicle-mounted vehicle positioning subsystem and a vehicle ground wireless transmission subsystem, wherein the vehicle-mounted measurement subsystem is used for carrying out real-time statistical parameter measurement on the electromagnetic interference inside a high-speed train vehicle by a multi-channel measurement receiver, extracting and classifying the electromagnetic interference with different characteristics and positioning source equipment emitting the electromagnetic interference inside the vehicle by the mode identification; the ground measurement subsystem is used for measuring real-time electromagnetic radiation emission signals by the multi-channel measurement receiver and filtering interference signals in the real-time electromagnetic radiation emission signals, which are from the outside of the high-speed train by utilizing blind signals; the vehicle-mounted vehicle positioning subsystem is used for acquiring real-time position and speed information of the high-speed train vehicle by utilizing a GPS (Global Positioning System) cooperative positioning technology; and the vehicle ground wireless transmission subsystem is used for implementing the time and space synchronization between the vehicle-mounted measurement subsystem and the ground measurement subsystem.
Owner:CHINA RAILWAYS CORPORATION +1
Pipeline locator receiver coil structure, signal processing method, pipeline locator receiver
ActiveCN107817531ALightweightEasy to carryProgramme controlComputer controlDigital signal processingEngineering
The invention belongs to the technical field of power cables, and discloses a pipeline locator receiver coil structure, a signal processing method, and a pipeline locator receiver. The pipeline locator receiver is characterized in that the pipeline locator receiver acquires magnetic field signals of buried cables through a coil and can calculate the location information of the cables by combiningwith methods of analog signal conditioning and digital signal processing; a first horizontal coil detects the magnetic field signals of the buried cables in the horizontal direction, and is combined with a second horizontal coil to measure the buried depth of the buried cables and the magnitude of the current of the buried cables; a vertical coil detects the magnetic field signals of the buried cables in the vertical direction, and is combined with the first horizontal coil to detect the left and right locations of the buried cables; and a third horizontal coil is combined with the second horizontal coil to measure the included angle between the receiver and the buried cables to realize the compass function. The pipeline locator receiver has the advantages of high reliability, compact andreasonable coil structure, complete detection functions, low cost, high anti-interference capability, relatively higher detection accuracy and relatively higher sensitivity.
Owner:XIDIAN UNIV
Electrooptical distance measuring device
Owner:LEICA GEOSYSTEMS AG
Determining scan strategy for digital card
ActiveUS20100027715A1Assess restrictionAmplitude-modulated carrier systemsDigital signal processingComputer science
A method is provided for determining a scan strategy to receive data for a digital unit associated with an electronic support measure receiver. The receiver scans a surrounding environment to detect and receive emitted signals while utilizing the digital unit to improve emitter identification. The digital unit is provided with the data according to requirements of digital signal processing algorithms implemented by the unit.
Owner:LOCKHEED MARTIN CORP
Spurious ratio control circuit for use with feed-forward linear amplifiers
InactiveUS7231191B2Easy to adjustMinimizing ratioAmplifier modifications to reduce non-linear distortionRadio transmissionObservational errorAudio power amplifier
A control system for a linear feed-forward amplifier, using the ratio of measured spurious energy. Measuring receivers are coupled to two monitoring points to measure the spurious energy content in the error signal and at the main output of a feed-forward amplifier. The control system measures the ratio of these detected spurious, and uses this to optimize the settings of the second loop distortion cancellation. With the addition of an extra monitoring point, the same technique may also be used to control an adaptive predistorter prior to the main amplifier.
Owner:INTEL CORP
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