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48 results about "Multipath reception" patented technology
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Telemetry information comprehensive treatment system of unmanned plane and compressive treatment display method thereof
InactiveCN101738608AEasy to monitorProcessing speedWave based measurement systemsTransmissionMulti machineComputerized system
The invention discloses a telemetry information comprehensive treatment system of an unmanned plane and a compressive treatment display method thereof. The telemetry information comprehensive treatment system of the invention constructs a comprehensive treatment system and the modules forming the comprehensive treatment system on a platform on the basis of a distributed computer system of the earth station of the unmanned plane. The comprehensive treatment display method of the system uses a local area network communication technique and a multi-thread technique, completes the multipath reception, distribution by category, modularization parallel treatment and display of the telemetry information, realizes the multi-machine share of the telemetry information, quickens information treatment speed, enhances display effect and increases playback function.
Owner:BEIHANG UNIV
Multipath video reception system
A system is presented for the multipath reception of video signals, including sound an / or image signals. The system includes at least two receivers and a diversity unit. At least one receiver receives and processes analog video signals, while the one or more remaining receivers receive and process digital video signals. The system may further include an analog selector unit for selecting the highest quality analog signal, and / or a digital selector unit for selecting the highest quality digital signal. The diversity unit receives the processed analog and digital video signals and combines them to produce a resulting video signal having a quality at least as high as the better of the processed analog and digital video signals. The diversity unit may combine the received video signals by performing a weighted addition of the signals.
Owner:HARMAN BECKER AUTOMOTIVE SYST
Multipath video reception system
A system is presented for the multipath reception of video signals, including sound an / or image signals. The system includes at least two receivers and a diversity unit. At least one receiver receives and processes analog video signals, while the one or more remaining receivers receive and process digital video signals. The system may further include an analog selector unit for selecting the highest quality analog signal, and / or a digital selector unit for selecting the highest quality digital signal. The diversity unit receives the processed analog and digital video signals and combines them to produce a resulting video signal having a quality at least as high as the better of the processed analog and digital video signals. The diversity unit may combine the received video signals by performing a weighted addition of the signals.
Owner:HARMAN BECKER AUTOMOTIVE SYST
Flat Semi-Transparent Ground Plane for Reducing Multipath
Multipath reception by an antenna is reduced by mounting the antenna on a semi-transparent ground plane that has a controlled distribution of layer impedance over a central region and a peripheral region. The central region includes a continuous conductive segment on which the ground element of the antenna is disposed. The distribution of the layer impedance over the peripheral region is configured by multiple conductive segments electromagnetically coupled by lumped circuit elements. A semi-transparent ground plane can be fabricated by depositing a metal film on a dielectric substrate and etching grooves into the metal film to form a desired pattern of conductive segments. Lumped circuit elements can be fabricated as discrete devices, surface mount devices, and integrated circuit devices. Various semi-transparent ground planes can be configured for linearly-polarized and circularly-polarized radiation.
Owner:TOPCON POSITIONING SYST INC
Diversity device used on TDD mobile communication system
InactiveCN1514554ATime-division multiplexDiversity/multi-antenna systemsCommunications systemTransceiver
The diversity unit consists of antenna unit containing two routes of antenna channels, signal selector including antenna selection switch and switch for selecting receiving and transmitting, transceiver unit including a receiver and a transmitter, and signal selection / control interface including RSSI module for testing intensity of received signal. One route of receiver and transmitter, and antenna in multipath reception and transmission are utilized in the device. Using switch in radio frequency for switching selections among multiple channels of antenna provides control interface, and strobing one route of antenna as receiving and transmitting channel. Same channel is adopted for receiving and transmitting signal in order to keep balance of chain. In TDD mode, receiving signal and transmitting signal are positioned at different time slots. Switch in radio frequency makes receiving signal and transmitting signal possible to use same antenna channel, and balance the chain.
Owner:ZTE CORP
Broadband micropatch antenna system with reduced sensitivity to multipath reception
ActiveUS8174450B2Simultaneous aerial operationsRadiating elements structural formsDual frequencyWave slowing
A micropatch antenna system with simultaneous high bandwidth and low sensitivity to multipath radiation is achieved by positioning a radiating element within a cavity in a ground plane. Bandwidth and sensitivity to multipath radiation may be varied by varying the height of the radiating element above the bottom of the cavity and above the top of the ground plane. The electromagnetic and physical characteristics of the antenna system may be further controlled by introducing dielectric solids or wave-slowing structures between the bottom of the cavity and the radiating element. A dual-band micropatch antenna system with simultaneous high bandwidth and low sensitivity to multipath radiation may be similarly configured by stacking a second radiating element on top of the first radiating element.
Owner:TOPCON GPS
Broadband Micropatch Antenna System with Reduced Sensitivity to Multipath Reception
ActiveUS20090273522A1High bandwidthReduce sensitivitySimultaneous aerial operationsRadiating elements structural formsDual frequencyHigh bandwidth
A micropatch antenna system with simultaneous high bandwidth and low sensitivity to multipath radiation is achieved by positioning a radiating element within a cavity in a ground plane. Bandwidth and sensitivity to multipath radiation may be varied by varying the height of the radiating element above the bottom of the cavity and above the top of the ground plane. The electromagnetic and physical characteristics of the antenna system may be further controlled by introducing dielectric solids or wave-slowing structures between the bottom of the cavity and the radiating element. A dual-band micropatch antenna system with simultaneous high bandwidth and low sensitivity to multipath radiation may be similarly configured by stacking a second radiating element on top of the first radiating element.
Owner:TOPCON GPS
Compact circular polarization antenna system with reduced cross-polarization component
ActiveUS20130342409A1Simultaneous aerial operationsAntenna earthingsDual band antennaCross polarization
Patch antennas for signals of global navigation satellite systems (GNSS) are described. A compact antenna system reduces directional diagram level in the rear hemisphere primarily for cross-polarized (left hand circularly-polarized) component. It can be used for reducing multipath reception. The antenna receives GNSS signals and includes a patch circularly-polarized radiator consisting of a radiating patch, a ground plane under it and a loop radiator coaxially located around the patch radiator. The loop radiator is excited by a separate power circuit or by a passive method where LHCP waves of MP and loop radiators in the rear hemisphere would be anti-phase added. A dual-band antenna system includes an active HF radiator, under which there is an active LF radiator under which there is a passive LF radiator, a loop HF radiator being coaxially located around the active HF radiator.
Owner:TOPCON POSITIONING SYST INC
Broadband Convex Ground Planes for Multipath Rejection
A ground plane for reducing multipath reception comprises a convex conducting surface and an array of conducting elements disposed on at least a portion of the convex conducting surface. Embodiments of the convex conducting surface include a portion of a sphere and a sphere. Each conducting element comprises an elongated body structure having a transverse dimension and a length, wherein the transverse dimension is substantially less than the length. The cross-section of the elongated body structure can have various user-specified shapes. Each conducting element can further comprise a tip structure. The azimuth spacings, lengths, and surface densities of the conducting elements can be functions of meridian angle. An antenna can be mounted directly on the conducting convex surface or on a conducting or dielectric support structure mounted on the conducting convex surface. System components, such as a navigation receiver, can be mounted inside the conducting convex surface.
Owner:TOPCON GPS
Compact Antenna System with Reduced Multipath Reception
ActiveUS20150340763A1Simultaneous aerial operationsRadiating elements structural formsPath lengthLow frequency band
An antenna is configured to operate with circularly-polarized electromagnetic radiation in a low-frequency band and in a high-frequency band. The antenna comprises a ground plane and a radiator. The radiator comprises four pairs of radiating elements disposed as pairs of spiral segments on a cylindrical surface having a longitudinal axis orthogonal to the ground plane. Each pair of radiating elements comprises a low-frequency radiating element and a high-frequency radiating element. The low-frequency radiating element comprises a low-frequency conductive strip. The high-frequency radiating element comprises an electrically-connected series of at least one high-frequency conductive strip and at least one high-frequency capacitor. The electrical path lengths of the low-frequency radiating elements and the electrical path lengths of the high-frequency radiating elements are equal.
Owner:TOPCON POSITIONING SYST INC
Multipath receiver of a spread spectrum communication system with dynamic matched filter and efficient signal combiner
A receiver for detecting, tracking and combining multipath components spanned over several symbol periods employs signal register arrays, a reference signal generator, matched filters, a signal combiner, and a decision circuit. The signal register arrays cascade for capturing different sections of a received signal with each section corresponding to a symbol period. The reference signal generator produces blocks of a local reference signal with each block as the local reference signal of a corresponding matched filter, holds these blocks for a symbol period, and then generates next blocks with each block being the successive block of its previous block. Each matched filter finds the correlations between corresponding section of received signal and corresponding section of local reference signal. The signal combiner delays the outputs of different matched filters by different amount of time and then combines the delayed outputs together for the decision circuit to make decisions.
Owner:YANG GEORGE L
Compact circular polarization antenna system with reduced cross-polarization component
ActiveUS20160043479A1Reduce receptionSimultaneous aerial operationsAntenna earthingsSoftware engineeringCross polarization
A compact GNSS antenna system reduces directional diagram level in the rear hemisphere primarily for LHCP component. It can be used for reducing multipath reception. A dual-band antenna system for receiving radio signals includes an active Microstip Patch (MP) High Frequency (HF) circularly-polarized radiator disposed directly on a radiating patch of an active MP low-frequency (LF) radiator. The radiating patch of the active MP LF radiator serves as a ground plane of the MP HF radiator. A loop HF radiator is coaxially arranged around the ground plane of the MP HF radiator. A passive LF radiator is under the ground plane of the active MP LF radiator. A loop LF radiator is axially located around the ground plane of the active MP LF radiator. The loop HF radiator and the loop LF radiator are each excited by a transmission line and a power circuit to generate RHCP waves.
Owner:TOPCON POSITIONING SYST INC
Broadband convex ground planes for multipath rejection
ActiveUS8441409B2Simultaneous aerial operationsRadiating elements structural formsGround planeBroadband
A ground plane for reducing multipath reception comprises a convex conducting surface and an array of conducting elements disposed on at least a portion of the convex conducting surface. Embodiments of the convex conducting surface include a portion of a sphere and a sphere. Each conducting element comprises an elongated body structure having a transverse dimension and a length, wherein the transverse dimension is substantially less than the length. The cross-section of the elongated body structure can have various user-specified shapes. Each conducting element can further comprise a tip structure. The azimuth spacings, lengths, and surface densities of the conducting elements can be functions of meridian angle. An antenna can be mounted directly on the conducting convex surface or on a conducting or dielectric support structure mounted on the conducting convex surface. System components, such as a navigation receiver, can be mounted inside the conducting convex surface.
Owner:TOPCON GPS
Rake reception apparatus
InactiveUS20020018519A1Reduce circuit sizeReduce power consumptionTransmission noise suppressionSynchronising arrangementFrequency spectrumControl circuit
To provide an apparatus which reduces the scale of a reception circuit and the power consumption as the tracking function of tracking phase jitter of the multipath propagation route. A RAKE reception apparatus includes a plurality of finger circuits for receiving signals spectrum-spread by spread codes, despreading respective reception signals retrieved by a searcher adapted for retrieving respective paths from multipath reception signals for demodulating the signals, and a RAKE combiner for combining outputs of the plural finger circuits. Each of the plural finger circuits is provided with one DLL circuit without being provided with an inner DLL circuit. The finger circuits to be tracked by the DLL circuit are switched by a changeover circuit. There is provided a control circuit for controlling the changeover circuit based on the weighting information for each finger circuit to be found by the RAKE combiner for sequentially selecting the finger circuits to be tracked by the DLL circuit.
Owner:NEC CORP
FM tuner
InactiveUS7885628B2Shorten detection timeBroadcast circuit arrangementsSubstation equipmentAdjacent-channel interferenceControl signal
An FM tuner that has a multipath reception detection unit and an adjacent-channel interference detection unit while reducing expansion of the scale of the circuit is available. A control signal for a stereo separation level is generated on the basis of a signal SM-DC corresponding to a reception field strength and of a signal SMP corresponding to a multipath noise component. The SMP is extracted from a fluctuation component signal SM-AC from an S-meter circuit 92 by a multipath noise extraction circuit 104. The multipath noise extraction circuit 104 used for control of the stereo separation level is shared as a portion of the circuitry for detecting the multipath signal reception state. A multipath reception detection unit 108 compares the SMP with a threshold value to detect a multipath reception state.
Owner:SEMICON COMPONENTS IND LLC
FM tuner
InactiveUS20090036085A1Improve search speedShorten detection timeBroadcast circuit arrangementsSubstation equipmentAdjacent-channel interferenceControl signal
An FM tuner that has a multipath reception detection unit and an adjacent-channel interference detection unit while reducing expansion of the scale of the circuit is available. A control signal for a stereo separation level is generated on the basis of a signal SM-DC corresponding to a reception field strength and of a signal SMP corresponding to a multipath noise component. The SMP is extracted from a fluctuation component signal SM-AC from an S-meter circuit 92 by a multipath noise extraction circuit 104. The multipath noise extraction circuit 104 used for control of the stereo separation level is shared as a portion of the circuitry for detecting the multipath signal reception state. A multipath reception detection unit 108 compares the SMP with a threshold value to detect a multipath reception state.
Owner:SEMICON COMPONENTS IND LLC
FM tuner
InactiveCN101359920ATransmissionStereophonic broadcast receivingAdjacent-channel interferenceControl signal
Owner:SANYO ELECTRIC CO LTD +1
A large-scale-MIMO based multi-user uplink frequency synchronization method
ActiveCN106452531ASuppress interferenceGood frequency synchronization performanceSpatial transmit diversityMulti user interferenceCarrier frequency offset
The invention discloses a large-scale-MIMO based multi-user uplink frequency synchronization method. A base station terminal in the method has a large scale uniform antenna array, and a multi-user terminal performs frequency synchronization through a base station reception antenna under uplink OFDM modulation. Since an incident signal sent by each user to the base station is limited to a narrow angle range under the influence of multipath, carrier frequency offset estimation and compensation are performed for each user using a joint space-frequency alignment method. In the invention, thanks to the spatial degree of freedom provided by the large-scale antenna array, a steering vector corresponding to the corresponding qualified direction of arrival of each user is used to perform reception wave beam formation to enable multi-user interference to be effectively suppressed. The multipath reception wave beam formation method makes an equivalent single-user transmission model form between each user and the base station, so that traditional single-user channel estimation and data detection technology can be used.
Owner:XI AN JIAOTONG UNIV +1
Channel modeling method and device suitable for satellite-ground communication
ActiveCN119519804Aimprove accuracyaccurately reflectRadio transmissionTransmission monitoringEngineeringGlobal coordinate system
The invention provides a channel modeling method and device suitable for satellite-ground communication, and the method comprises the steps: generating a satellite motion track, and setting ground environment parameters and simulation parameters; converting the satellite motion trail from a global coordinate system to a local coordinate system; acquiring a satellite position from the converted satellite motion trail, and performing ray tracing calculation based on plane wave hypothesis to obtain all effective ray paths between the satellite position and the position of a ground receiver; for each effective ray path, calculating large-scale fading caused by a meteorological environment and small-scale fading caused by ground end multipath propagation and multi-end movement; and a channel model is generated by combining large-scale fading and small-scale fading. According to the method, large-scale fading caused by the meteorological environment is modeled, the influence of meteorological attenuation on the multipath receiving power is considered, small-scale fading caused by multipath propagation and multi-end movement at the ground end is modeled, and the modeling accuracy is improved.
Owner:PURPLE MOUNTAIN LAB
Antenna system with reduced multipath reception
ActiveUS20160064809A1Reduce lossesImprove efficiencyRadiating elements structural formsHelical antennasCapacitanceGround plane
An antenna system with a sharp difference in directional pattern is intended for receiving GNSS signals. The antenna system includes at least two antenna elements located above a high-impedance capacitive ground plane, and a combining network. Antenna elements are spaced apart in vertical direction. The combining network provides subtraction of the signal reflected from the ground, the arrangement of antenna elements above the high-impedance capacitive ground plane making such subtraction efficient.
Owner:TOPCON POSITIONING SYST INC
Flat Semi-Transparent Ground Plane for Reducing Multipath
Owner:TOPCON POSITIONING SYST INC
Compact circular polarization antenna system with reduced cross-polarization component
Patch antennas for signals of global navigation satellite systems (GNSS) are described. A compact antenna system reduces directional diagram level in the rear hemisphere primarily for cross-polarized (left hand circularly-polarized) component. It can be used for reducing multipath reception. The antenna receives GNSS signals and includes a patch circularly-polarized radiator consisting of a radiating patch, a ground plane under it and a loop radiator coaxially located around the patch radiator. The loop radiator is excited by a separate power circuit or by a passive method where LHCP waves of MP and loop radiators in the rear hemisphere would be anti-phase added. A dual-band antenna system includes an active HF radiator, under which there is an active LF radiator under which there is a passive LF radiator, a loop HF radiator being coaxially located around the active HF radiator.
Owner:TOPCON POSITIONING SYST INC
Ground Planes for Reducing Multipath Reception by Antennas
An antenna system for a global navigation satellite system reference base station is disclosed.The antenna system includes an antenna positioned above a high capacitive impedance surface (HCIS) ground plane.Over a specific range of the lateral dimension of the HCIS ground plane and the height of the antenna above the HCIS ground plane, a high level of multipath suppression and high sensitivity for low-elevated satellites can be simultaneously maintained.The HCIS ground plane can be fabricated as a flat conducting plate with an array of conducting elements such as pins, pins with expanded tips, or mushroom structures. Alternatively, the HCIS can be fabricated as a flat conducting plate with a concentric series of choke rings.The antenna system can provide a positioning accuracy of + / −1 mm, an order of magnitude improvement over previous designs.
Owner:TOPCON POSITIONING SYST INC
Compact antenna system
ActiveUS9203150B2Reduce manufacturing costEasy to integrateSimultaneous aerial operationsAntenna supports/mountingsElectricityElectrical conductor
An antenna system for global navigation satellite systems includes a ground plane, an active antenna disposed above the ground plane, and a passive antenna disposed below the ground plane. The active antenna includes a conducting ring substantially parallel to the ground plane. A radiating conductor passes through substantially the center of the conducting ring; the ends of the radiating conductor are electrically connected to the conducting ring. An excitation pin is electrically connected to the radiating conductor. A set of reactive impedance elements is electrically connected between the conducting ring and the ground plane. The set of reactive impedance elements is disposed substantially orthogonal to the ground plane. The passive antenna is similar to the active antenna, except the passive antenna does not have an excitation pin. The antenna system effectively suppresses multipath reception, and its compact size and light weight make it suitable for integration with a surveying pole.
Owner:TOPCON POSITIONING SYST INC
CDMA secure coding and decoding method and system
ActiveCN113131967ARealize interconnectionImprove anti-interference abilitySecret communicationTransmissionCode division multiple accessEngineering
The invention provides a code division multiple access (CDMA) secure coding and decoding method and system, and the CDMA secure coding method comprises the steps: receiving a first clock signal, and converting the first clock signal into an analog signal; receiving a data signal and a second clock signal, and performing differential double-phase coding on the data signal to obtain a coded digital signal; conditioning and amplifying the analog signal, and coupling the analog signal with the coded digital signal to obtain a required baseband signal; coding the baseband signal to obtain a baseband coded signal; and performing CDMA coding on the baseband coding signal to obtain a CDMA coding signal. According to the CDMA safe coding and decoding method and system, interconnection and intercommunication of European railway operation control systems can be met, and the problems that an existing European train operation control system is poor in anti-interference performance, only suitable for short-distance transmission, high in bit error rate, high in receiving sensitivity threshold, free of multipath receiving and the like due to the fact that FSK, PSK and other signal systems are adopted are solved.
Owner:CRSC RESEARCH & DESIGN INSTITUTE GROUP CO LTD
Compact antenna system with reduced multipath reception
An antenna is configured to operate with circularly-polarized electromagnetic radiation in a low-frequency band and in a high-frequency band. The antenna comprises a ground plane and a radiator. The radiator comprises four pairs of radiating elements disposed as pairs of spiral segments on a cylindrical surface having a longitudinal axis orthogonal to the ground plane. Each pair of radiating elements comprises a low-frequency radiating element and a high-frequency radiating element. The low-frequency radiating element comprises a low-frequency conductive strip. The high-frequency radiating element comprises an electrically-connected series of at least one high-frequency conductive strip and at least one high-frequency capacitor. The electrical path lengths of the low-frequency radiating elements and the electrical path lengths of the high-frequency radiating elements are equal.
Owner:TOPCON POSITIONING SYST INC
Ground planes for reducing multipath reception by antennas
An antenna system for a global navigation satellite system reference base station is disclosed. The antenna system includes an antenna positioned above a high capacitive impedance surface (HCIS) ground plane. Over a specific range of the lateral dimension of the HCIS ground plane and the height of the antenna above the HCIS ground plane, a high level of multipath suppression and high sensitivity for low-elevated satellites can be simultaneously maintained. The HCIS ground plane can be fabricated as a flat conducting plate with an array of conducting elements such as pins, pins with expanded tips, or mushroom structures. Alternatively, the HCIS can be fabricated as a flat conducting plate with a concentric series of choke rings. The antenna system can provide a positioning accuracy of + / −1 mm, an order of magnitude improvement over previous designs.
Owner:TOPCON POSITIONING SYST INC
Diversity device used on TDD mobile communication system
InactiveCN100426703CTime-division multiplexDiversity/multi-antenna systemsCommunications systemTransceiver
Owner:ZTE CORP
Multipath receiver and processing of 3GPP ATSSS on a multipath receiver
ActiveUS12513091B2Network traffic/resource managementFrequency-division multiplex detailsEngineeringProtocol data unit
A multipath receiver includes: a reorder queue configured to queue data packets received over multiple paths; and a reorder queue controller configured to reorder the data packets in the reorder queue according to a reorder criterion. The reorder queue controller is configured to allow Multi-Access Protocol Data Unit (MA PDU) Sessions based on Access Traffic Steering, Switching, and Splitting (ATSSS). The reorder queue controller is configured to choose to activate a reordering of the data packets. The reorder queue controller is configured to negotiate the activation of the reordering of the data packets with peers of an MA PDU Session based on an ATSSS use case, wherein in case reordering is activated, the data packets are queued in a reorder queue. The reorder criterion is based on a sequence numbering of the data packets of the MA PDU Session based on the ATSSS use case.
Owner:DEUTSCHE TELEKOM AG
Multipath Receiver and 3GPP ATSSS Processing on the Multipath Receiver
ActiveCN118805367BNetwork traffic/resource managementConnection managementEngineeringMultipath reception
A multipath receiver includes: a reordering queue device configured to queue data packets received on multiple paths; a reordering queue controller configured to reorder the data packets in the reordering queue according to reordering criteria, wherein the reordering queue controller is configured to allow an ATSSS-based MA PDU session, wherein the reordering criteria are based on the sequence numbers of the data packets of the ATSSS-based MA PDU session, and wherein the reordering queue controller is configured to select to activate the reordering of the data packets. The present invention further relates to a method of processing data packets received by a multipath receiver.
Owner:DEUTSCHE TELEKOM AG