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79results about How to "Improve ranging ability" patented technology
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Methods and apparatus for synchronously combining signals from plural transmitters
ActiveUS20050031045A1Improve ranging abilityReduce transmit powerSite diversitySpatial transmit diversitySignal onSignal-to-noise ratio (imaging)
Enhanced reception of transmitted signals in a communication system is achieved by synchronously combining transmissions from a cluster of transmitters at a distant receiver. The transmitters coordinate transmissions such that each substantially simultaneously transmits the same signal on the same communication channel. As a consequence of the spatial diversity of the transmitters, the transmitted signals arrive at the receiver at different times. The receiver essentially treats the different transmitted signals as though they were different multipath signals from a single transmitter. A multipath equalizer or combiner is used to determine timing offsets among the received signals, and the received signals are time aligned by phase rotating the signals in accordance with the estimated timing offsets. The time-aligned signals are then coherently combined and detected. The combined signal has a greater signal-to-noise ratio than the individual received signals, permitting detection at a greater range or with a lower bit error rate.
Owner:STINGRAY IP SOLUTIONS LLC
Method for managing multiple frequency assignment using terminal's received performance in ofdma wran system
InactiveUS20100177645A1Lower performance requirementsImprove performanceReceivers monitoringFrequency-division multiplex detailsNoise power spectrumArea network
There is a provided a method for managing a multiple frequency assignment using a terminal's RX performance in an orthogonal frequency division multiple access (OFDMA) wireless regional area network (WRAN) system, including: a) measuring a bit energy / noise power spectral density (Eb / No) and a received signal strength indicator (RSSI) which are received in the terminal; b) informing the measured Eb / No and RSSI of a base station; c) calculating a round trip delay (RTD) in the base station; d) determining a terminal performance level based on the measured Eb / No, RSSI and the calculated RTD; and e) determining a frequency channel and modulation scheme based on the determined performance level.
Owner:ELECTRONICS & TELECOMM RES INST
Method for suppressing multipath clutters of through-the-wall radar
InactiveCN103197290AImprove ranging abilityImprove detection rateWave based measurement systemsRadar systemsMultipath channels
The invention relates to a method for suppressing multipath clutters of a through-wall radar, and belongs to the technical field of through-wall radars. Firstly a moving target indicator (MTI) is adopted to filter and suppress strong static clutters including wall back waves and the like, the back waves of moving objects are protruded, and detection of cell average-constant false alarm rate (CA-CFAR) is carried out; secondly range delay information of detected real objects and the multipath clutters is cohesively extracted in the distance direction; then corresponding range delay of multipath channels is forecast by adoption of wall position information and detected object distance delay; and finally, detected objects are separated through the range of distance delay of the detected multipath channels, and the multipath clutters are screened and suppressed. Based on a single-shot single-receiving antenna allocation, back wave data of the through-wall radar are detected, the distance information of the moving objects is extracted, meanwhile interference with a radar system by the multipath clutters is suppressed, detecting performance of the radar system can be improved significantly, and impact on the radar system by the multipath clutters is suppressed.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Laser distance measuring device
InactiveUS20100123893A1Improve signal-to-noise ratioImprove ranging abilityOptical rangefindersElectromagnetic wave reradiationElectricityLaser ranging
The laser distance measuring device of the present invention comprises an emitting part having a laser generating device with a first spectral bandwidth arranged on an emitting optical path and a collimating lens. The emitting part also has an optical filter with a second spectral bandwidth which is less than the first spectral bandwidth. The laser distance measuring device also has a receiving part having a photoelectric receiving and conversion device to receive the measuring beam reflected by the object to be measured and convert it into an electric signal. Using the optical filter, most of the unneeded portions of the laser beam emitted from the laser are filtered out so that the useful proportion of the measuring beam of the laser beam is improved and the ranging capability of the laser distance measuring device under a bright or strong light environment is enhanced.
Owner:CHERVON HK LTD WANCHAI
Methods and apparatus for synchronously combining signals from plural transmitters
ActiveUS7218682B2Improve ranging abilityReduce transmit powerSite diversitySpatial transmit diversitySignal-to-noise ratio (imaging)Communications system
Enhanced reception of transmitted signals in a communication system is achieved by synchronously combining transmissions from a cluster of transmitters at a distant receiver. The transmitters coordinate transmissions such that each substantially simultaneously transmits the same signal on the same communication channel. As a consequence of the spatial diversity of the transmitters, the transmitted signals arrive at the receiver at different times. The receiver essentially treats the different transmitted signals as though they were different multipath signals from a single transmitter. A multipath equalizer or combiner is used to determine timing offsets among the received signals, and the received signals are time aligned by phase rotating the signals in accordance with the estimated timing offsets. The time-aligned signals are then coherently combined and detected. The combined signal has a greater signal-to-noise ratio than the individual received signals, permitting detection at a greater range or with a lower bit error rate.
Owner:STINGRAY IP SOLUTIONS LLC
Laser distance measuring device
InactiveUS8089618B2Improve signal-to-noise ratioImprove ranging abilityOptical rangefindersElectromagnetic wave reradiationElectricityLaser ranging
Owner:CHERVON HK LTD WANCHAI
Structure and construction method of uplink control channel in mobile wideband wireless access system
InactiveUS20100322160A1Improve ranging abilityEasy to detectModulated-carrier systemsDiversity/multi-antenna systemsCyclic prefixControl channel
The present invention relates to an uplink control channel configuration in a mobile wideband wireless access system, and an allocation method thereof. An uplink control channel includes a long cyclic prefix used to improve interference and distortion caused by multipath transmission characteristics of an initial ranging or handover ranging signal and a periodic ranging or band request ranging signal. In addition, a short orthogonal frequency division multiple (OFDM) symbol is used to transmit uplink control information when one terminal exists or the number of terminals is small.
Owner:ELECTRONICS & TELECOMM RES INST +1
Photon counting laser radar based on composite pseudo-random coding
ActiveCN108089194AReduced imaging timeImprove noise immunityElectromagnetic wave reradiationBeam splitterPrism
The invention discloses a photon counting laser radar based on composite pseudo-random coding. The photon counting laser radar is composed of a signal generator, a light intensity modulation device, alaser device, a beam splitter prism, a circulator, an optical system, a scanner, a GM-APD single-photon detector, a photodiode, a photon counting module, and a signal processing module. An overall structure of a transmitting-receiving-same-path type optical reduced system is employed and a scanner is used for carry out scanning and transmitting a laser pulse string, so that the field angle of thelaser radar is extended. After processing on a laser signal transmitted by an optical system by the beam splitter prism, one part of the signal irradiates the photodiode directly to form a light trigger signal and the other part of signal is scanned by the scanner and then the scanned signal is irradiated on a target; an echo signal reflected by the target enters the scanner, the processed signalreturns to a second port of the circulator by the optical signal and enters the GM-APD single-photon detector through a third port of the circulator; the GM-APD single-photon detector records an echosequence and generates a stopping signal; and a detection result recorded by the photon counting module is transmitted to the signal processing module for follow-up processing and flight time of a pulse string is obtained.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Ranging Priority Indication
ActiveUS20200015038A1Improve ranging abilityReduce congestionLocation information based serviceRadio wave reradiation/reflectionComputer networkTelecommunications
This disclosure relates to techniques for performing ranging wireless communication including prioritization. A first wireless device may transmit a request for ranging services to a second wireless device. The first wireless device may transmit an indication of a ranging priority to the second wireless device. The second wireless device may determine a granted ranging priority. The first and second wireless device may perform ranging communication according to the granted ranging priority.
Owner:APPLE INC
Laser distance measuring device
ActiveCN102278974AReduce the impactImprove stabilityOptical rangefindersOptical elementsLaser rangingOptoelectronics
The invention provides a laser ranging apparatus. The apparatus comprises: a laser module for generating a collimated detection beam; a receiving objective lens for receiving a reflected beam of the detection beam, wherein the receiving optical axis of the receiving objective lens is parallel to the emergent optical axis of the detection beam; a photoelectric converter for carrying out photoelectric conversion for an image generated by the reflected beam on a focal plane of the receiving objective lens, wherein a sensitization surface of the photoelectric converter is positioned on the focal plane of the receiving objective lens; a control and analysis system connected with the laser module and the photoelectric converter, wherein the size of the sensitization surface of the photoelectricconverter matches with the size of the imaging light spot of the receiving objective lens. According to the present invention, influence on effective light signals due to daylight and noise is reduced, such that the effective light signals are stood out from the background light; by using the photosensitive element with the small sensitization surface, and the small imaging light spot, the weak light signal reflected from the distant place can be aggregated at a maximum, therefore, with adopting the laser ranging apparatus under the sunlight, the ranging capability can be effectively enhanced, and the ranging range is further far.
Owner:NANJING CHERVON IND
Communication method based on low-orbit mobile communication satellite
ActiveCN110208822ARealize safe positioning and timing serviceImprove anti-interference abilitySatellite radio beaconingTime-division multiplexingBroadcasting
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Two-dimensional scanning laser radar device and electronic device
ActiveCN110749893AImprove ranging abilityRealize multi-region scanningElectromagnetic wave reradiationGrismRadar
The invention discloses a two-dimensional scanning laser radar device. The two-dimensional scanning laser radar device comprises a transmitting unit, a receiving unit, a control unit connected with the transmitting unit and the receiving unit, a light splitting device and at least three rotating prisms, wherein the transmitting unit comprises at least two lasers and is used for transmitting lasersignals; the light splitting device is used for collimating and / or converging the laser signals and reflecting echo signals reflected by a scanning area; the receiving unit comprises at least two detectors and is used for receiving the echo signals; the rotating prisms are respectively a first rotating prism, a second rotating prism and a third rotating prism and are used for adjusting the scanning direction of the laser signals. According to the two-dimensional scanning laser radar device disclosed by the invention, scanning in multiple angle ranges in the horizontal direction and the vertical direction can be realized through the rotating prisms, the problems that a two-dimensional scanning laser radar is small in scanning range and low in reliability are solved, multi-area scanning canbe realized, the scanning range of the laser radar device is larger, and the distance measuring capability of the laser radar is greatly improved.
Owner:ORADAR TECH CO LTD
Solid-state lidar, structure and control method thereof
ActiveCN110275177AImprove ranging abilitySmall divergence angleElectromagnetic wave reradiationBeam expanderTransceiver
The present application relates to a solid-state lidar, and a structure and control method thereof. The solid-state lidar includes a transceiver module, a galvanometer, and a beam expander. The transceiver module includes a transmitting module, a beam splitting module, and a receiving module. The beam expander is configured to expand and collimate the output laser reflected by the galvanometer and then to emit the expanded and collimated laser to a detection area, and is also configured to converge the reflected laser to the galvanometer. In a laser emission process, since the transmitting module has constant transmitting power, the divergence angle of the output laser can be reduced by the beam expander so as to accumulate the output laser energy, improve the energy density of the output laser, and further improve the ranging capability of the lidar. In a laser receiving process, the beam expander having a large receiving aperture can receive more reflected laser so as to also improve the ranging capability. Thus, the receiving aperture of the solid-state lidar is no longer limited by the size of the receiving surface of the galvanometer. In the case of equivalent transmitting power and detectors, the ranging capability of the lidar is improved.
Owner:SUTENG INNOVATION TECH CO LTD
Laser device, laser device emission plate assembly, laser radar and laser device packaging method
ActiveCN110459951AReduce measurement errorImprove ranging abilitySemiconductor laser arrangementsSemiconductor laser optical deviceImage resolutionRadar
The invention relates to a laser device. The laser device includes a substrate having a positioning portion, a laser device chip which is arranged on the substrate and has a light emitting surface, and a laser beam shaping element which achieves positioning through the positioning portion and is opposite to the light emitting surface of the laser device chip. The invention further relates to a laser device packaging method and a laser radar having the laser device. The laser device is advantaged in that the limit of the vertical direction angle resolution of a laser emitting board assembly (limited only by the fast axis size) can be greatly improved, a precise positioning structure is processed on a silicon base to effectively control the fast axis divergence angle after compression and beam directivity, and ranging performance is improved.
Owner:HESAI TECH CO LTD
Laser radar system and control method thereof
ActiveCN110007312AImprove ranging abilityReduce distractionsElectromagnetic wave reradiationLaser transmitterRadar systems
The invention relates to a laser radar system and a control method thereof. The laser radar system comprises a transmitting device and a receiving device, wherein the transmitting device comprises a laser transmitter and a first galvanometer, and the receiving device comprises a laser receiver and a second galvanometer; the first galvanometer is used for reflecting the emergent light beam output by the laser transmitter to a target object; and the second galvanometer is used for receiving the echo light beam and reflecting the received echo light beam to the laser receiver. According to the embodiment of the invention, the interference of the background light to the echo light beam can be reduced, so that the laser radar system can easily identify the effective light information in the light information, thereby improving the distance measurement capability of the laser radar; the transmitting device and the receiving device are arranged in an off-axis mode, installation and adjustmentare easy, and preamble interference is avoided. Meanwhile, all echo light beams can be received through the second galvanometer, the energy utilization rate of the echo light beams is high, and the detection capacity is improved.
Owner:SUTENG INNOVATION TECH CO LTD
Laser radar optical system and laser radar
The embodiment of the invention discloses a laser radar optical system and a laser radar. The system comprises a transmitter optical unit and a transmitter correction unit; the transmitter optical unit is used for collimating outgoing laser; the transmitter correction unit comprises at least one transmitter cylindrical lens, and is used for correcting the outgoing laser, wherein the bus of the transmitter cylindrical lens is vertical to the directrix of the transmitter cylindrical lens; the directrix of the transmitter cylindrical lens is parallel to the horizontal plane; the symmetrical axisof the transmitter cylindrical lens is superposed with the optical axis of the transmitter optical unit; the transmitter cylindrical lens comprises a first curved surface and a second curved surface;and outgoing light passes through the transmitter optical unit, the first curved surface of the transmitter cylindrical lens and the second curved surface of the transmitter cylindrical lens in sequence. In the embodiment of the invention, an optical correction unit is arranged at the transmitter; influence of the shell of the laser radar to the outgoing laser can be reduced; and thus, the rangingcapability of the laser radar is improved.
Owner:SUTENG INNOVATION TECH CO LTD
Dual-laser driving circuit and scanning laser radar ranging device and method
PendingCN108181621AGuarantee security requirementsRealize distance measurementElectromagnetic wave reradiationFar distanceElectricity
The present invention relates to a dual-laser driving circuit and a scanning laser radar ranging device and method. The circuit comprises a voltage doubler unit for outputting a pulsed high voltage toa first node when a first driving pulse signal is received, a power storing and releasing unit used for storing electric energy when a pulse voltage is present at a first node, releasing a first electric quantity to a second node when a second driving pulse signal is received and releasing a second electric quantity to the second node when a third driving pulse signal is received, and a light emitting unit which is used for generating a laser signal of first power when the first electric quantity is inputted at the first node and generating a laser signal of second power when the second electric quantity is inputted at the second node. The scanning laser radar ranging device is realized based on the above circuit. The method is realized based on the above device. According to the embodiment of the present invention, the requirements of human eye safety by near-distance laser power can be ensured, stray light at a close range is filtered, far-distance and near-distance ranging is achieved, and the ranging ability of a lifting device is improved.
Owner:BEIJING WANJI TECH
Method and device for improving laser radar ranging capability
ActiveCN109901177AImprove ranging abilitySolve the problem that the ranging capability is limited by the number of laser linesElectromagnetic wave reradiationRadarInterference problem
The invention provides a method and a device for improving a laser radar ranging capability. The method comprises the following steps that: obtaining the minimum interval of the laser emission units,which emit laser at the same time, of a laser radar; obtaining the minimum interval of the laser receiving units, which receive a laser echo signal at the same time, of the laser radar; and accordingto the minimum interval of the laser emission units, which emit laser at the same time, of the laser radar and the minimum interval of the laser receiving units, which receive the laser echo signal atthe same time, of the laser radar, configuring the working time sequence of each laser emission unit and each laser receiving unit in the laser radar to enable multiple paths of laser emitted from the laser radar to finish simultaneous ranging on a premise that the multiple paths of laser do not mutually interfere. By use of the method, the problem that the conventional 3D scanning type laser radar senor ranging capability is restricted by a laser ray number is solved, and in addition, an interference problem brought by simultaneous light emission is solved on the basis of a light path and alight emitting time sequence.
Owner:BEIJING WANJI TECH
Laser rangefinder and method thereof
InactiveUS7499829B2Accurate detectionImprove ranging abilityOptical rangefindersDigital computer detailsTarget signalImage resolution
Disclosed is a laser rangefinder and method thereof. By using characteristics that noise has non-correlation and signals have correlation, laser beams are output to a target to find a range to the target with iteration rates of thousands of times per second, signals for each range-finding are binary-quantized using a sampling frequency corresponding to a range-finding resolving power, and data are accumulated. After this, the accumulated data are processed in a statistical manner to detect a target signal and produce a target range based on the target signal. According to the present invention, the rangefinder for outputting low-power laser beams, using the laser beams reflected from the target, and detecting a range to the target, easily and accurately detects target signals in the noise.
Owner:EOSYST +1
Microphone array method for sound source localization
InactiveCN110068796AGood effectImprove ranging abilityPosition fixationComplex mathematical operationsSound source locationSound sources
A microphone array method for sound source localization comprises steps of setting spatial distribution positions of seven microphones in a seven-element stereoscopic microphone array: s0 (0, 0, 0), s1 (d, 0, d), s2 (-d, 0, d), s3 (0, d, -d),s4 (0, -d, -d), s5 (0, 0, d), s6 (0, 0, -d), wherein, s0 is the microphone at the origin, s1-s6 are 6 microphones distributed at other positions rather than the origin, and d is the distance from s1- s6 to the coordinate axis; establishing a mathematical model for the microphone array according to the spatial distribution positions of the seven microphones; solving the mathematical model and determining the location of the sound source. The microphone array method for sound source localization can effectively improve the ranging performance on the basis of keeping the array size and the number of microphones unchanged and not sacrificing the positioning performances of the pitch angle and the direction angle. The array formation has a better good effect on the positioning of the pitch angle and the direction angle, so as to effectively improve the accuracy of distance positioning while keeping the advantages of high positioning accuracy at thepitch angle and the direction angle in the spatial cross stereoscopic array.
Owner:TIANJIN UNIV
Laser ranging device and method
PendingCN111487639AHigh peak powerThe peak power is higher than the peak power of the light beam emitted by the first light sourceElectromagnetic wave reradiationLaser rangingHigh peak
The invention discloses a laser ranging device. The laser ranging device comprises a transmitting module, a receiving module and a control and processing circuit, wherein the transmitting module includes first light sources, a beam combining element and a second light source; the beam combining element couples light beams emitted by the first light sources together to form the second light sourceso as to emit a second light beam; the receiving module includes a pixel array composed of a plurality of pixels; and the control and processing circuit is used for synchronizing trigger signals of the transmitting module and the receiving module to calculate flight time required by the light beam from transmitting to receiving, and calculating a distance of a target object according to the flighttime. The plurality of first light sources are coupled together to form the second light source; and light energy and peak power of emitted light beams are increased, the emitted light beams have advantage of high peak power under a narrow pulse width, different scanning ranging modes are achieved in combination with a scanning element, and the laser ranging device can improve ranging precision and a ranging capacity at the same time.
Owner:ORADAR TECH CO LTD
Two-dimensional scanning laser radar device and electronic device
The invention discloses a two-dimensional scanning laser radar device which is used for emitting laser beams to a scanning area. The two-dimensional scanning laser radar device comprises an emitting unit, a receiving unit, a control unit connected with the emitting unit and the receiving unit, a light splitting element, a scanning mirror and an optical element, wherein the emitting unit comprisesa laser and is used for emitting laser signals to the scanning area; the light splitting element is used for reflecting echo signals reflected by a target on the scanning area; the scanning mirror comprises a first scanning mirror and a second scanning mirror; the first scanning mirror and the second scanning mirror are arranged in a conjugate relation and are used for modulating the scanning direction of the laser beams. The two-dimensional scanning laser radar device can realize scanning in multiple angle ranges in the horizontal and vertical directions, solves the problems of small receiving caliber, small scanning range and low reliability of a two-dimensional scanning laser radar, expands the scanning range of the laser radar and greatly improves the ranging capability of the laser radar.
Owner:ORADAR TECH CO LTD
Photon counting laser radar based on true random coding
ActiveCN110161521AReduced measurement timeImprove relevanceElectromagnetic wave reradiationRadar systemsDead time
The invention discloses a photon counting laser radar based on true random coding, and belongs to the technical field of the laser radar. The true random coding greatly reduces the system volume and cost and overcomes the influence on the system ranging performance by the detector dead time while reserving the advantage that the traditional pseudo random coding photon counting laser radar system is low in transmitting power, fast in imaging speed and capable of overcoming distance ambiguity, and the true random coding photon counting laser radar system has extremely high crosstalk-resisting capacity. The radar mainly comprises two avalanche photodiodes in Geiger model, a pulse shaping circuit, a laser device, an optical system, an external clock, a photon counting module, and a signal processing module. The traditional signal generator is replaced with the single-photon detector, the practical value of the system is greatly improved, and the laser radar is extensively applied to the target ranging and imaging field.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Ranging method and mobile terminal
InactiveCN108225278AImprove ranging abilityReduce complexityPicture taking arrangementsPicture interpretationComputer scienceLarge range
The invention provides a ranging method and a mobile terminal and relates to the technical field of measurement. The ranging method comprises the following steps of aiming to a same target photographed object, respectively acquiring imaging areas of a camera of the mobile terminal at one position under a first focal length condition and a second focal length condition; according to the imaging areas, acquiring an imaging ratio of the camera under the first focal length condition and the second focal length condition; and according to the imaging ratio, obtaining a distance between the target photographed object and the mobile terminal based on a corresponding relation between the preset imaging ratio and the distance. The ranging method can perform distance measurement within a larger range based on a photographing system native to the mobile terminal, and the complexity and the cost of the mobile terminal are lowered while the ranging ability of the mobile terminal is improved.
Owner:VIVO MOBILE COMM CO LTD
Laser range finder
InactiveCN106501813AEnergy concentrationLong distanceElectromagnetic wave reradiationLaser rangingPhotoelectric conversion
The invention discloses a laser range finder. The laser range finder comprises a range finder body, a laser emission cavity and a regulation and control module, wherein a laser emission port, a reception lens and a display screen are arranged on the range finder body; a switch button is arranged below the display screen; one side of the range finder body is provided with an external infrared laser source; a buckle is arranged between the range finder body and the external infrared laser source; the side surface of the range finder body is provided with a fixed clamping hand; a support base and support feet are arranged below the fixed clamping hand; an infrared laser source, a filter, a concave lens, an optical crystal, a convex lens and a lens are arranged in the laser emission cavity; a regulation and control circuit is arranged in the range finder body; the regulation and control circuit is provided with a storage battery, a main control circuit, a photosensitive component, a photoelectric conversion module, a calculation module, a display module and a regulation and control module; one end of the regulation and control module is provided with an external interface; and the external interface is connected with the external infrared laser source so as to improve the emission power of the laser so that longer distance can be more accurately measured.
Owner:温州中壹技术研究院有限公司
Method and device for origination of ranging process in TDD-OFDMA (time division duplex-orthogonal frequency division multiple access) system
InactiveCN102404269AOvercoming Frequency Selectivity EffectsOvercome the problem of excessive amplitudeMulti-frequency code systemsTransmitter/receiver shaping networksFast Fourier transformMicrowave
The invention discloses method and device for the origination of a ranging process in a TDD-OFDMA (time division duplex-orthogonal frequency division multiple access) system, mainly for solving the problem of large influence on the ranging performance of the prior art by a channel frequency selectivity and a near-far effect. The ranging steps comprise: (1) a channel estimation for a downlink frame, (2) a pre-equalization, (3) a code word mapping, (4) an amplitude-limiting processing, (5) an IFFT (inverse fast Fourier transform), and (6) an initial power control. The ranging device comprises a downlink frame channel estimation module, a pre-equalization module, a code word mapping module, an amplitude-limiting module, an IFFT module and an initial power control module. The method and device for the origination of a ranging process in a TDD-OFDMA system disclosed by the invention have the advantage of being capable of eliminating the near-far effect and keeping the orthogonality of a ranging code in a non-fast-transforming frequency selectivity channel; and the method and device are suitable for the origination of a ranging process in a time division multiplexing WiMax (worldwide interoperability for microwave access) or LTE (long term evolution) system.
Owner:XIDIAN UNIV
Laser radar
PendingCN113640819AImprove ranging abilityImprove power densityElectromagnetic wave reradiationLaser arrayEngineering
The invention provides a laser radar which comprises a laser array arranged in a linear array or an area array, a focal plane arranged on a first optical assembly, and the first optical assembly arranged on a transmitting light path and forming an equivalent focal length larger than the focal length of a main lens group unit of a transmitting end. And / or an optical detector array arranged in a linear array or an area array and arranged on a focal plane of a second optical assembly, and the second optical assembly is arranged on a receiving optical path and forms an equivalent focal length larger than the focal length of the main lens group unit at the receiving end. According to the embodiment of the invention, the power density in the point cloud field angle area is improved through the arrangement of the first optical assembly of the light transmitting end, and / or the background light noise power in the point cloud field angle area is reduced through the arrangement of the second optical assembly of the receiving end, so that the distance measurement capability of the radar can be improved.
Owner:HESAI TECH CO LTD
Multi-line laser radar
ActiveCN111337903AIncrease the lengthImprove ranging abilityWave based measurement systemsControl cellEngineering
The invention discloses multi-line laser radar, which comprises a control unit, and a transmitting unit, a receiving unit, a scanning unit, a wireless transmission unit and a power supply unit which are connected with the control unit. The control unit controls the transmitting unit to transmit by receiving trigger signals of the scanning unit at different angles; after the light irradiates a detected object, echo amplification is received through the receiving unit, then timing ranging is conducted on logic level signals, meanwhile, the reflectivity intensity is calculated according to the width of the level signals, and the control unit obtains three-dimensional point cloud in combination with angle information and distance information in the horizontal direction and the vertical direction. According to the invention, the characteristics of a plurality of pixels of an array detector are utilized, angle information is obtained through pixel positions, the array detector uses non-uniform micro-element size arrangement to obtain high-density central area test point clouds, and when the array detector is matched with a receiving lens, the lengths of the two ends of the detector are increased along with edge distortion, so that the uniformity of a receiving angle is facilitated.
Owner:北京大汉正源科技有限公司
Laser radar ranging system
PendingCN111198380AIncreaseImprove dynamic rangeElectromagnetic wave reradiationConvertersDistance detection
The invention relates to a laser radar ranging system. The system comprises a variable gain amplifier, a converter and a controller, the variable gain amplifier is connected with the converter, and the converter is connected with the controller; wherein the controller is used for determining the distance measurement distance between the target object and the optical receiver according to an outputsignal of the converter, and adjusting the gain of the variable gain amplifier according to the distance measurement distance. The controller adjusts the variable gain amplifier to reduce the gain ina short distance and adjusts the variable gain amplifier to increase the gain in a long distance, so that the amplitude of an optical signal detected by the laser radar in long-distance detection isenhanced, the dynamic range of a detection signal of the laser radar is improved, and the distance measurement performance and the distance measurement capability are further improved.
Owner:SUTENG INNOVATION TECH CO LTD
Method for managing multiple frequency assignment using terminal's received performance in OFDMA WRAN system
InactiveUS8031667B2Lower performance requirementsImprove performanceReceivers monitoringModulated-carrier systemsNoise power spectrumArea network
There is a provided a method for managing a multiple frequency assignment using a terminals RX performance in an orthogonal frequency division multiple access (OFDMA) wireless regional area network (WRAN) system, including: a) measuring a bit energy / noise power spectral density (Eb / No) and a received signal strength indicator (RSSI) which are received in the terminal; b) informing the measured Eb / No and RSSI of a base station; c) calculating a round trip delay (RTD) in the base station; d) determining a terminal performance level based on the measured Eb / No, RSSI and the calculated RTD; and e) determining a frequency channel and modulation scheme based on the determined performance level.
Owner:ELECTRONICS & TELECOMM RES INST
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