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11.发明授权公开(公告)号：US11378649B2
公开(公告)日：2022-07-05
申请号：US16814531
申请日：2020-03-10
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Subburaj , Dan Wang , Adeel Ahmad
Abstract: In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φd) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φd to generate a corrected virtual array vector Sc. A first Fourier transform is performed on the corrected virtual array vector Sc to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.
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公开(公告)号：US11125856B2
公开(公告)日：2021-09-21
申请号：US16201726
申请日：2018-11-27
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Muhammad Zubair Ikram , Adeel Ahmad , Dan Wang , Murtaza Ali
IPC: G01S13/34 , G01S7/35 , G01S13/931
Abstract: An apparatus, including processing unit (PU) cores and computer readable storage devices storing machine instructions for determining a distance between a target object and a radar sensor circuit. The PU cores receive a beat signal generated by the radar sensor circuit and compensate for a phase difference between the received beat signal and a reconstruction of the received beat signal to obtain a phase compensated beat signal. The phase compensated beat signal is then filtered to remove spurious reflections by demodulating the phase compensated beat signal using an estimated frequency of the phase compensated beat signal. The PU cores then apply a low pass filter to the demodulated phase compensated beat signal, resulting in a modified beat signal. The PU cores then determine the distance between the target object and the radar sensor circuit using the modified beat signal.
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Patent Agency Ranking
13.发明申请公开(公告)号：US20200209352A1
公开(公告)日：2020-07-02
申请号：US16814531
申请日：2020-03-10
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Subburaj , Dan Wang , Adeel Ahmad
Abstract: In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φd) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φd to generate a corrected virtual array vector Sc. A first Fourier transform is performed on the corrected virtual array vector Sc to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.
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14.发明授权公开(公告)号：US11879968B2
公开(公告)日：2024-01-23
申请号：US17217584
申请日：2021-03-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Dan Wang , Sandeep Rao , Adeel Ahmad
CPC classification number: G01S13/931 , G01S7/2883 , G01S13/34 , G01S13/449 , G01S13/583 , H04B7/212
Abstract: A radar system comprises a set of transmitters and a processor coupled to the set of transmitters. The processor is configured to modulate a first portion of a chirp in a chirp frame according to a first phase. The processor is further configured to modulate a second portion of the chirp in the chirp frame according to a second phase and configured to combine the first and second portions of the chirp to produce a phase-modified chirp. The processor is further configured to instruct the set of transmitters to transmit the phase-modified chirp by applying time division multiple access (TDMA) and by directing radio frequency energy according to a target angle and a target gain.
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公开(公告)号：US20230152439A1
公开(公告)日：2023-05-18
申请号：US17975863
申请日：2022-10-28
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Muhammet Yanik , Dan Wang , Adeel Ahmad
CPC classification number: G01S13/726 , G06T7/248 , G06T7/74 , G01S7/415 , G06T2207/10016 , G06T2207/10028
Abstract: A device is provided. In some examples, the device includes a radar sensor configured to receive reflected chirps. In addition, the device includes processing circuitry configured to determine that a first object is moving. The processing circuitry is further configured to, responsive to determining that the first object is moving, determine a first location of the first object using a single frame of the reflected chirps. The processing circuitry is also configured to determine that a second object is stationary. In addition, the processing circuitry is configured to, responsive to determining that the second object is stationary, determine a second location of the second object using a plurality of frames of the reflected chirps.
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16.发明申请公开(公告)号：US20180011170A1
公开(公告)日：2018-01-11
申请号：US15371754
申请日：2016-12-07
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Subburaj , Dan Wang , Adeel Ahmad
CPC classification number: G01S7/354 , G01S13/343 , G01S13/42 , G01S13/92 , G01S2007/356
Abstract: In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φd) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φd to generate a corrected virtual array vector Sc. A first Fourier transform is performed on the corrected virtual array vector Sc to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.
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公开(公告)号：US20160291142A1
公开(公告)日：2016-10-06
申请号：US15089956
申请日：2016-04-04
Applicant: Texas Instruments Incorporated
Inventor： Adeel Ahmad , Dan Wang , Muhammad Zubair Ikram , Murtaza Ali
CPC classification number: G01S7/352 , G01S7/414 , G01S7/415 , G01S13/931 , G01S2007/356
Abstract: An FMCW radar is used to detect live objects by processing the matched, filtered radar return on a frame by frame basis. An FFT cross correlation coefficient is computed, followed by computing a modified geometric mean of the absolute value of the cross correlation coefficients. The modified geometric mean is then compared to a preset threshold to determine whether the object is moving or is stationary.
Abstract translation: FMCW雷达用于通过逐帧处理匹配的滤波雷达回波来检测实时物体。 计算FFT互相关系数，然后计算互相关系数绝对值的修正几何平均值。 然后将修改的几何平均值与预设阈值进行比较，以确定对象是移动还是静止。
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