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公开(公告)号：US12099120B2
公开(公告)日：2024-09-24
申请号：US17054242
申请日：2019-05-10
发明人： Phillip Sandborn , Sen Lin
CPC分类号： G01S17/34 , G01S7/4817 , G01S7/491 , G01S17/58 , G01S17/95 , G01S7/4815
摘要： A LIDAR system and method for determining a distance and a velocity of a target. The LIDAR system can include laser bank (62) is configured to generate a laser field from a first laser beam having a positive frequency sweep and a second laser beam having a negative frequency sweep, an optical combiner (65), an optical coupler (63), a photoreceiver (66), and a control circuit (69). The optical coupler direct a first portion of the laser field at the target such that the first portion is reflected by the target to the optical combiner. The optical combiner can optically combine the portions of the laser field. The output an 1-output (67) and a Q-output (68) according to the optically combined portions of the laser field. The control circuit can determine a nominal beat frequency, which corresponds to the distance of the target, and a frequency shift, which corresponds to the velocity of the target, accordingly.
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公开(公告)号：US20240151832A1
公开(公告)日：2024-05-09
申请号：US17982197
申请日：2022-11-07
CPC分类号： G01S7/497 , B64D15/20 , B64D45/00 , G01S17/95 , B64D2045/0085
摘要： In accordance with at least one aspect of this disclosure, a method of detecting a fault in a plurality of optical detectors includes receiving a first return beam from a first optical detector interrogation beam to generate a first optical signal indicative of an atmospheric condition from a first location on board the aircraft and receiving a second return beam from a second optical detector interrogation beam to generate a second optical signal indicative of the atmospheric condition from a second location on board the aircraft. The method includes, comparing each of the first and second optical signals with a baseline value to determine whether there is a fault in at least one optical detector of the plurality of optical detectors.
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公开(公告)号：US11976971B2
公开(公告)日：2024-05-07
申请号：US17272667
申请日：2019-09-04
发明人： Will Johnson
CPC分类号： G01J3/0221 , G01J3/18 , G01J3/2803 , G01S17/95 , G02B6/0008 , G01J2003/2813
摘要： Spectrographic measurements are often limited by the amount of light that is available. Photons that are not collected or measured reduce the signal to noise and therefore reduce measurement precision. This invention collects the zero order light and sends it through the spectrometer again. In an atmospheric LIDAR, the zero order recycling is estimated to increase the rotational Raman signal by an additional 20%. A grating based spectrometer where the zero order light is collected by a lens or mirror and focused into a fiber optic that sends the light to the input slit where it is directed into the spectrometer again. There can be a plurality of recycle fibers. The detector can be either a single linear array or a two dimensional array such as a CCD or CMOS camera.
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公开(公告)号：US20240111058A1
公开(公告)日：2024-04-04
申请号：US17951507
申请日：2022-09-23
IPC分类号： G01S17/95 , G01S7/48 , G01S7/4861 , G01S17/10
CPC分类号： G01S17/95 , G01S7/4802 , G01S7/4861 , G01S17/10
摘要： Disclosed are systems and methods for detecting weather conditions at a LiDAR sensor level. In some aspects, a method includes calculating a reference probability mass function (PMF) of at least one field of a point cloud generated from reference scene responses received from a light detection and ranging (LiDAR) sensor; calculating a current PMF for the at least one field of the point cloud generated from a current scene response received from the LiDAR sensor; determining a statistical difference between the reference PMF and the current PMF using a Kullbeck-Leibler (KL) divergence calculation; and responsive to the statistical difference satisfying a threshold for the at least one field, flagging an environmental change in the current scene response.
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公开(公告)号：US11933903B2
公开(公告)日：2024-03-19
申请号：US16976401
申请日：2018-03-29
发明人： Shumpei Kameyama , Eisuke Haraguchi , Yutaka Kajiyama , Nobuki Kotake , Takayuki Yanagisawa , Toshiyuki Ando
摘要： An optical transmission unit (3) transmits an optical signal having a light intensity set as a Low level component of a pulse. An optical partial reflector (6) is provided on a path through which transmission light is transmitted from a circulator (5) to the atmosphere, and reflects the optical signal. A detection unit (11) performs coherent detection on reception light using, as local light, a signal in a Low level section in the optical signal reflected by the optical partial reflector (6).
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公开(公告)号：US11906545B2
公开(公告)日：2024-02-20
申请号：US17028127
申请日：2020-09-22
发明人： Shumpei Kameyama , Nobuki Kotake , Yutaka Kajiyama
摘要： A laser radar device calculates a wind speed for each of a plurality of divided sections obtained by dividing a trajectory drawn by a laser beam in front of a wind turbine.
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公开(公告)号：US11879958B2
公开(公告)日：2024-01-23
申请号：US16153348
申请日：2018-10-05
发明人： Matthew Wiebold , Xiao Zhu Fan
CPC分类号： G01S17/95 , G01S7/4813 , G01S17/86
摘要： A system includes a light detection and ranging (LiDAR) unit comprising an atmospheric characterization transceiver module. The LiDAR unit is configured to transmit light into an external interaction air region, and collect scattered portions of the transmitted light from the external interaction air region. A robotic arm is operatively coupled to the atmospheric characterization transceiver module. A processor is in operative communication with the robotic arm. The processor is configured to control the robotic arm to position and point the atmospheric characterization transceiver module in a direction of interest to interrogate the external interaction air region.
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公开(公告)号：US11867870B2
公开(公告)日：2024-01-09
申请号：US16978569
申请日：2018-03-12
发明人： Kimihiko Hiroi
摘要： A point data acquisition unit acquires point data indicating a reflection point obtained by an optical sensor that receives reflected light of an emitted light beam reflected at the reflection point. An image data acquisition unit acquires image data of an area around the reflection point indicated by the point data. A luminance calculation unit calculates smoothness of luminance of the image data. A fog determination unit determines the density of fog based on a distance, which is determined from the point data, from the optical sensor to the reflection point and the smoothness of the luminance.
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公开(公告)号：US11821991B2
公开(公告)日：2023-11-21
申请号：US18299583
申请日：2023-04-12
发明人： Jianwei Shao , Hailong Zhu , Zengli Xiao , Zhi Li , Chen Deng
CPC分类号： G01S17/95 , G01P13/025 , G01P5/26
摘要： Disclosed is in the present disclosure a dynamic compensation wind measurement lidar system, including a laser, an A/D converter, a signal processor, and a data processor. The signal processor includes a power spectrum calculation module, a motion sensor, and a pulse integration module. The pulse integration module divides an optical pulse transmitted in a single beam period into n sections for integration, where real-time motion and attitude data collected by the motion sensor is added to each of the sections for integration to improve a signal-to-noise ratio by integrating a power spectral density for a plurality of periodic pulse signals. In the present disclosure, by means of integrating optical pulses in single-beam dwell time by sections and attitude superimposing, an attitude compensation frequency may be greatly increased, and the attitude compensation frequency is adjustable.
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10.发明公开公开(公告)号：US20230271721A1
公开(公告)日：2023-08-31
申请号：US17652601
申请日：2022-02-25
申请人： THE BOEING COMPANY
发明人： Manuela Sauer
CPC分类号： B64D45/08 , G08G5/0091 , G01P5/24 , G01S17/95 , G01W1/02 , G01P13/045
摘要： A method is provided for supporting flight operations of vertical takeoff and landing (VTOL) aircraft in an urban air mobility (UAM) environment that includes a vertiport. The method includes accessing first observed weather data obtained by sensors located on-site at the vertiport and second observed weather data obtained by sensors onboard VTOL aircraft. A data fusion is performed to integrate the first observed weather data and the second observed weather data to produce a collection of weather data that describes the weather in an environment of the vertiport, and an environment of the VTOL aircraft. And a weather map is produced based on the collection of weather data, the weather map illustrating one or more meteorological features of the weather in the environment of the vertiport and/or the VTOL aircraft, the weather map produced for use in supporting flight operations of the VTOL aircraft.
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