公开(公告)号：US20160277007A1

公开(公告)日：2016-09-22

申请号：US14664078

申请日：2015-03-20

Applicant: Texas Instruments Incorporated

Inventor： Jawaharlal Tangudu ,  Sachin Bharadwaj ,  Sundarrajan Rangachari

IPC: H03H11/04

CPC classification number: H03H11/04 ,  H03H17/0275 ,  H03H17/028 ,  H03H17/0642

Abstract: Example embodiments of the systems and methods of variable fractional rate digital resampling as disclosed herein achieve variable rate conversion. In the example embodiments, the input samples are upsampled by a factor N in an upsampler followed by a filter which then goes through a linear interpolator. The filter cleans the spectral images of the signal created due to the upsampling operation.

Abstract translation: 本文公开的可变分数速率数字重采样的系统和方法的示例实施例实现可变速率转换。 在示例实施例中，输入样本在上采样器中由因子N上采样，随后是滤波器，滤波器然后经过线性内插器。 滤波器清除由于上采样操作而产生的信号的光谱图像。

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

IPC: G06F3/01 ,  G06F3/16 ,  G01S7/35 ,  G01S7/41 ,  G01S13/58 ,  G01S13/34

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.

公开(公告)号：US20210286066A1

公开(公告)日：2021-09-16

申请号：US17330477

申请日：2021-05-26

Applicant: Texas Instruments Incorporated

Inventor： Sachin Bharadwaj ,  Sriram Murali

IPC: G01S13/42 ,  G01S13/931 ,  G01S13/34

Abstract: A multi-mode radar system, radar signal processing methods and configuration methods, including using predetermined, range/mode-specific pushing windows to perform windowing on range and velocity object data before performing an FFT on the windowed object data matrix to generate a three-dimensional object matrix including range, velocity and angle data. The individual windows have an angular spectral response that corresponds to a combined angular coverage field of view of the transmit and receive antennas for the corresponding mode to minimize the total weighted energy outside the main lobe and to provide increasing spectral leakage outside the combined angular coverage field of view with angular offset from the main lobe to push out much of the spectral leakage into regions where leakage tolerance is high due to the corresponding combined angular coverage field of view of the transmit and receive antennas.

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.

公开(公告)号：US20180321359A1

公开(公告)日：2018-11-08

申请号：US16036011

申请日：2018-07-16

Applicant: Texas Instruments Incorporated

Inventor： Sachin Bharadwaj ,  Karthik Subburaj

IPC: G01S7/35 ,  H03L7/06 ,  G01S13/58 ,  G01S7/40 ,  G01S13/34

CPC classification number: G01S7/35 ,  G01S7/4008 ,  G01S13/343 ,  G01S13/583 ,  G01S13/584 ,  H03L7/06 ,  H03L7/0805 ,  H03L7/12

Abstract: The disclosure provides a radar apparatus. The radar apparatus includes a transmit unit that generates a first signal in response to a reference clock and a feedback clock. The first signal is scattered by one or more obstacles to generate a second signal. A receive unit receives the second signal and generates N samples corresponding to the second signal. N is an integer. A conditioning circuit is coupled to the transmit unit and the receive unit. The conditioning circuit receives the N samples corresponding to the second signal, and generates N new samples using an error between the feedback clock and the reference clock.

公开(公告)号：US09531343B2

公开(公告)日：2016-12-27

申请号：US14664078

申请日：2015-03-20

Applicant: Texas Instruments Incorporated

Inventor： Jawaharlal Tangudu ,  Sachin Bharadwaj ,  Sundarrajan Rangachari

IPC: H03K5/00 ,  G06F17/10 ,  H03H11/04

CPC classification number: H03H11/04 ,  H03H17/0275 ,  H03H17/028 ,  H03H17/0642

Abstract: Example embodiments of the systems and methods of variable fractional rate digital resampling as disclosed herein achieve variable rate conversion. In the example embodiments, the input samples are upsampled by a factor N in an upsampler followed by a filter which then goes through a linear interpolator. The filter cleans the spectral images of the signal created due to the upsampling operation.

Abstract translation: 本文公开的可变分数速率数字重采样的系统和方法的示例实施例实现可变速率转换。 在示例实施例中，输入样本在上采样器中由因子N上采样，随后是滤波器，滤波器然后经过线性内插器。 滤波器清除由于上采样操作而产生的信号的光谱图像。

公开(公告)号：US20240411005A1

公开(公告)日：2024-12-12

申请号：US18804422

申请日：2024-08-14

Applicant: Texas Instruments Incorporated

Inventor： Sachin Bharadwaj ,  Sriram Murali

IPC: G01S13/42 ,  G01S7/288 ,  G01S13/34 ,  G01S13/58 ,  G01S13/931

Abstract: A multi-mode radar system, radar signal processing methods and instruction-based radar signal processing are provided. In an example, such processing includes using range/mode-specific pushing windows to perform windowing on range and velocity object data before performing an angle transform on the windowed object data matrix to generate a three-dimensional object matrix including range, velocity and angle data. The individual windows have an angular spectral response that corresponds to a combined angular coverage field of view of the transmit and receive antennas for the corresponding mode to minimize the total weighted energy outside the main lobe and to provide increasing spectral leakage outside the combined angular coverage field of view with angular offset from the main lobe to push out much of the spectral leakage into regions where leakage tolerance is high due to the corresponding combined angular coverage field of view of the transmit and receive antennas.

公开(公告)号：US11650285B2

公开(公告)日：2023-05-16

申请号：US16036011

申请日：2018-07-16

Applicant: Texas Instruments Incorporated

Inventor： Sachin Bharadwaj ,  Karthik Subburaj

IPC: G01S13/34 ,  G01S7/35 ,  G01S13/58 ,  G01S7/40 ,  H03L7/06 ,  H03L7/08 ,  H03L7/12

CPC classification number: G01S7/35 ,  G01S7/4008 ,  G01S13/343 ,  G01S13/583 ,  H03L7/06 ,  H03L7/0805 ,  H03L7/12 ,  G01S13/584

Abstract: The disclosure provides a radar apparatus. The radar apparatus includes a transmit unit that generates a first signal in response to a reference clock and a feedback clock. The first signal is scattered by one or more obstacles to generate a second signal. A receive unit receives the second signal and generates N samples corresponding to the second signal. N is an integer. A conditioning circuit is coupled to the transmit unit and the receive unit. The conditioning circuit receives the N samples corresponding to the second signal, and generates N new samples using an error between the feedback clock and the reference clock.

公开(公告)号：US11579284B2

公开(公告)日：2023-02-14

申请号：US17068976

申请日：2020-10-13

Applicant: Texas Instruments Incorporated

Inventor： Sachin Bharadwaj ,  Karthik Subburaj ,  Sriram Murali

IPC: G01S13/44 ,  G01S7/40 ,  G01S13/30 ,  G01S13/90 ,  G06V10/20 ,  G06V10/42 ,  G01S7/35

Abstract: A radar system is provided that includes transmission signal generation circuitry, a transmit channel coupled to the transmission generation circuitry to receive a continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range, a receive channel coupled to the transmit channel via a feedback loop to receive the test signal, the receive channel including an in-phase (I) channel and a quadrature (Q) channel, a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle, and a processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the collected energy measurements.

公开(公告)号：US11047970B2

公开(公告)日：2021-06-29

申请号：US15587564

申请日：2017-05-05

Applicant: Texas Instruments Incorporated

Inventor： Sachin Bharadwaj ,  Sriram Murali

IPC: G01S13/42 ,  G01S13/931 ,  G01S13/34 ,  G01S13/58 ,  G01S7/288

Abstract: A multi-mode radar system, radar signal processing methods and configuration methods, including using predetermined, range/mode-specific pushing windows to perform windowing on range and velocity object data before performing an FFT on the windowed object data matrix to generate a three-dimensional object matrix including range, velocity and angle data. The individual windows have an angular spectral response that corresponds to a combined angular coverage field of view of the transmit and receive antennas for the corresponding mode to minimize the total weighted energy outside the main lobe and to provide increasing spectral leakage outside the combined angular coverage field of view with angular offset from the main lobe to push out much of the spectral leakage into regions where leakage tolerance is high due to the corresponding combined angular coverage field of view of the transmit and receive antennas.