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公开(公告)号：US11747435B2
公开(公告)日：2023-09-05
申请号：US17243616
申请日：2021-04-29
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Saurabh Khanna
IPC: G01S7/03 , G01S7/35 , G01S13/34 , G01S13/42 , G01S13/931 , H01Q3/26 , H01Q1/32 , H01Q3/24 , H01Q21/08
CPC classification number: G01S7/032 , G01S7/354 , G01S13/34 , G01S13/42 , G01S13/931 , H01Q1/3233 , H01Q3/247 , H01Q3/2629 , H01Q21/08
Abstract: A radar apparatus for estimating position of a plurality of obstacles. The radar apparatus includes a receive antenna unit. The receive antenna unit includes a linear array of antennas and an additional antenna at a predefined offset from at least one antenna in the linear array of antennas. The radar apparatus also includes a signal processing unit. The signal processing unit estimates an azimuth frequency associated with each obstacle of the plurality of obstacles from a signal received from the plurality of obstacles at the linear array of antennas. In addition, the signal processing unit estimates an azimuth angle and an elevation angle associated with each obstacle from the estimated azimuth frequency associated with each obstacle.
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公开(公告)号：US11579242B2
公开(公告)日：2023-02-14
申请号：US16442152
申请日：2019-06-14
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sandeep Rao , Karthik Ramasubramanian , Indu Prathapan , Raghu Ganesan , Pankaj Gupta
Abstract: A radar hardware accelerator (HWA) includes a fast Fourier transform (FFT) engine including a pre-processing block for providing interference mitigation and/or multiplying a radar data sample stream received from ADC buffers within a split accelerator local memory that also includes output buffers by a pre-programmed complex scalar or a specified sample from an internal look-up table (LUT) to generate pre-processed samples. A windowing plus FFT block (windowed FFT block) is for multiply the pre-processed samples by a window vector and then processing by an FFT block for performing a FFT to generate Fourier transformed samples. A post-processing block is for computing a magnitude of the Fourier transformed samples and performing a data compression operation for generating post-processed radar data. The pre-processing block, windowed FFT block and post-processing block are connected in one streaming series data path.
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23.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：US11255695B2
公开(公告)日：2022-02-22
申请号：US16451380
申请日：2019-06-25
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jayawardan Janardhanan , Sandeep Rao , Goutam Dutta
Abstract: A system (10) for pedestrian use includes an accelerometer (110) having multiple electronic sensors; an electronic circuit (100) operable to generate a signal stream representing magnitude of overall acceleration sensed by the accelerometer (110), and to electronically correlate a sliding window (520) of the signal stream with itself to produce peaks at least some of which represent walking steps, and further operable to electronically execute a periodicity check (540) to compare different step periods for similarity, and if sufficiently similar then to update (560) a portion of the circuit substantially representing a walking-step count; and an electronic display (190) responsive to the electronic circuit (100) to display information at least in part based on the step count. Other systems, electronic circuits and processes are disclosed.
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公开(公告)号：US11204647B2
公开(公告)日：2021-12-21
申请号：US15952453
申请日：2018-04-13
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sandeep Rao , Sachin Bharadwaj , Piyali Goswami
Abstract: A method for gesture recognition includes receiving, by a processor, a first digital intermediate frequency (IF) signal stream from a first receive antenna and receiving, by the processor, a second digital IF signal stream from a second receive antenna. The method also includes computing, by the processor, a weighted Doppler metric stream based on the first digital IF signal stream and the second digital IF signal stream and computing, by the processor, an angle metric stream based on the first digital IF signal stream and the second digital IF signal stream. Additionally, the method includes computing, by the processor, a correlation between the weighted Doppler metric stream and the angle metric stream, to generate a first correlation and recognizing, by the processor, a gesture, based on the first correlation.
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Patent Agency Ranking
公开(公告)号：US10996313B2
公开(公告)日：2021-05-04
申请号：US16173795
申请日：2018-10-29
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Piyali Goswami , Sandeep Rao , Sachin Bharadwaj
IPC: G01S7/40 , G01S7/41 , G01S13/536 , G01S13/56 , G01S7/35
Abstract: A method of operating a frequency modulated continuous wave (FMCW) radar system includes receiving, by at least one processor, digital intermediate frequency (IF) signals from a mixer coupled to a receive antenna. The method also includes computing, by the at least one processor, a motion metric based on the digital IF signals; operating, by the at least one processor, the FMCW radar system in a classification mode, in response to determining that the motion metric is above a threshold; and operating, by the at least one processor, the FMCW radar system in a detection mode, in response to determining that the motion metric is below the threshold for at least a first amount of time. An amount of power consumed by the FMCW radar system in the detection mode is less than an amount of power consumed by the FMCW radar system in the classification mode.
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公开(公告)号：US10962637B2
公开(公告)日：2021-03-30
申请号：US16204457
申请日：2018-11-29
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sachin Bharadwaj, Jr. , Sandeep Rao
Abstract: A radar data processing device includes at least one analog-to-digital converter (ADC) configured to digitize a plurality of input signals, wherein each input signal includes radar chirp and radar chirp reflection information received at one of a plurality of receiver antennas. The radar data processing device also includes Fast Fourier Transform (FFT) logic configured to generate FFT output samples based on each digitized input signal, wherein at least some of the generated FFT output samples are across antenna FFT output samples associated with at least two of the plurality of receiver antennas. The radar data processing device also includes a processor configured to determine a plurality of object parameters based on at least some of the generated FFT output samples, wherein the processor uses a neural network classifier trained to provide a confidence metric for at least one of the plurality of object parameters.
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公开(公告)号：US20200301000A1
公开(公告)日：2020-09-24
申请号：US16897309
申请日：2020-06-10
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sandeep Rao
Abstract: A method of estimating position of an obstacle of a plurality of obstacles with a radar apparatus. An azimuth frequency, an elevation frequency and a range of the obstacle are estimated to generate an estimated azimuth frequency, an estimated elevation frequency and an estimated range of the obstacle. A metric is estimated from one or more of the estimated azimuth frequency, the estimated elevation frequency and the estimated range of the obstacle. The metric is compared to a threshold to detect an error in at least one of the estimated azimuth frequency and the estimated elevation frequency. On error detection, a sign of at least one of the estimated azimuth frequency and the estimated elevation frequency is inverted to generate a true estimated azimuth frequency and a true estimated elevation frequency respectively.
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公开(公告)号：US20200209353A1
公开(公告)日：2020-07-02
申请号：US16816588
申请日：2020-03-12
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Karthik Subburaj , Brian Paul Ginsburg , Daniel Colum Breen , Sandeep Rao , Karthik Ramasubramanian
IPC: G01S7/40 , G01S13/931 , G01S7/35 , G01S7/03
Abstract: Methods for monitoring of performance parameters of one or more receive channels and/or one or more transmit channels of a radar system-on-a-chip (SOC) are provided. The radar SOC may include a loopback path coupling at least one transmit channel to at least one receive channel to provide a test signal from the at least one transmit channel to the at least one receive channel when the radar SOC is operated in test mode. In some embodiments, the loopback path includes a combiner coupled to each of one or more transmit channels, a splitter coupled to each of one or more receive channels, and a single wire coupling an output of the combiner to an input of the splitter.
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30.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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