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公开(公告)号：US20200271763A1
公开(公告)日：2020-08-27
申请号：US16283739
申请日：2019-02-23
发明人： Zhenghan Zhu , Yue Lu , John Wu
摘要： A system and method for correcting a Light Detection And Ranging (LiDAR) return signal is disclosed. The LiDAR return signal is digitized by a converter. An exemplary signal correction system includes a signal processor configured to identify saturated samples from the LiDAR return signal, determine a correction parameter based on non-saturated samples in the LiDAR return signal and corresponding samples in a reference signal, and correct the saturated samples in the LiDAR return signal using the correction parameter.
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公开(公告)号：US10473770B1
公开(公告)日：2019-11-12
申请号：US16232973
申请日：2018-12-26
发明人： Zhenghan Zhu , Yue Lu , Jihua Li , John K. Wu
摘要： In some embodiments, a method for operating a light detection and ranging (LiDAR) system in an automobile provides a more accurate range estimate by combining multiple processed waveforms which are weighted according to their signal to noise ratios. At least one waveform is transmitted within a first time period, and reflected of an object. The reflected waveform is received and processed to improve the signal to noise ratio (SNR). The processing produces a higher number of output waveforms, such as through processing convolution. The SNR for each of the output waveforms is determined. An estimated range to the object from each output waveform is determined. The estimated ranges are then weighted according to their SNRs, and combined to provide an final determined range to the object.
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公开(公告)号：US20200182985A1
公开(公告)日：2020-06-11
申请号：US16213990
申请日：2018-12-07
发明人： John K. Wu , Lingkai Kong , Zhenghan Zhu
摘要： A method for operating a LiDAR system in an automobile that can include receiving noise data corresponding to an ambient noise level, receiving false positive data corresponding to a rate of false positive object detection occurrences; determining an object detection range spanning a distance defined by a minimum range of object detection and a maximum range of object detection for the LiDAR system; generating an object detection threshold value for detecting objects based on the noise data and the rate of false positive data; applying the object detection threshold value to each of a plurality of range values within the object detection range; and applying a gain sensitivity profile to the object detection threshold value at each of a plurality of range values.
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公开(公告)号：US20200278430A1
公开(公告)日：2020-09-03
申请号：US16290785
申请日：2019-03-01
发明人： Zhenghan Zhu , Yue Lu , Yibo Yu , Vipul Chawla , John K. Wu
摘要： Methods and apparatus for performing a ranging operation are provided. In one example, an apparatus comprises a transmitter circuit, a receiver circuit, a controller, and a code storage. The controller can obtain a first code from the code storage, determine, from the first code, first timing information and first amplitude information of a corresponding first group of one or more signals, and control the transmitter circuit to transmit the first group of one or more signals based on the first timing information and the first amplitude information. The controller can configure a matched filter based on the first timing information and the first amplitude information, identify return signals of the first group of one or more signals based on processing received signals using the configured matched filter, and perform a ranging operation based on the identified return signals and the first group of one or more signals.
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公开(公告)号：US10826269B2
公开(公告)日：2020-11-03
申请号：US16377203
申请日：2019-04-06
发明人： Yibo Yu , Yue Lu , Vipul Chawla , Zhenghan Zhu , Lingkai Kong
摘要： A system for controlling a pulsed laser diode includes a power source configured to supply power to the pulsed laser diode and at least one driving branch between the power source and the pulsed laser diode. The at least one driving branch is configured to control power delivery from the power source to the pulsed laser diode. The at least one driving branch is connected to a cathode of the pulsed laser diode.
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公开(公告)号：US20200278431A1
公开(公告)日：2020-09-03
申请号：US16290660
申请日：2019-03-01
发明人： Zhenghan Zhu , Yue Lu , John K. Wu , Lingkai Kong
摘要： Disclosed are techniques for improving the probability of detection and the probability of false alarm of a light detection and ranging (LiDAR) system. A receiver of the LiDAR system is configured to obtain a noise signal vector for an operation condition and determine the coefficients of a matched filter based on the noise signal vector. The matched filter is used to filter a returned signal vector corresponding to returned light detected by the receiver. The receiver detects an object in the field of view of the LiDAR system based on identifying, in the returned signal vector filtered by the matched filter, a pulse having a peak higher than a threshold value. In some embodiments, the receiver is configured to determine the threshold value based on the noise signal vector, energy of the transmitted signal, and a desired false alarm rate.
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