公开(公告)号：US11366211B2

公开(公告)日：2022-06-21

申请号：US16984246

申请日：2020-08-04

Applicant: Texas Instruments Incorporated

Inventor： Sandeep Rao ,  Karthik Subburaj ,  Sriram Murali ,  Karthik Ramasubramanian

IPC: G01S13/28 ,  G06F17/14 ,  G01S7/41 ,  G01S13/536 ,  G01S13/931 ,  G01S13/34 ,  G01S7/35 ,  G06F17/13 ,  H04N5/232

Abstract: A radar system is provided that includes a radar transceiver integrated circuit (IC) configurable to transmit a first frame of chirps, and another radar transceiver IC configurable to transmit a second frame of chirps at a time delay ΔT, wherein ΔT=Tc/K, K≥2 and Tc is an elapsed time from a start of one chirp in the first frame and the second frame and a start of a next chirp in the first frame and the second frame, wherein the radar system is configured to determine a velocity of an object in a field of view of the radar system based on first digital intermediate frequency signals generated responsive to receiving reflected chirps of the first frame and second digital IF signals generated responsive to receiving reflected chirps of the time delayed second frame, wherein the maximum measurable velocity is increased by a factor of K.

公开(公告)号：US20210389418A1

公开(公告)日：2021-12-16

申请号：US17462086

申请日：2021-08-31

Applicant: Texas Instruments Incorporated

Inventor： Brian Paul Ginsburg ,  Karthik Subburaj ,  Karthik Ramasubramanian ,  Sachin Bhardwaj ,  Sriram Murali ,  Sandeep Rao

IPC: G01S7/35 ,  G01S7/40 ,  G01S13/32 ,  G01S7/02 ,  G01S13/931

Abstract: A frequency modulated continuous wave (FMCW) radar system is provided that includes a receiver configured to generate a digital intermediate frequency (IF) signal, and an interference monitoring component coupled to the receiver to receive the digital IF signal, in which the interference monitoring component is configured to monitor at least one sub-band in the digital IF signal for interference, in which the at least one sub-band does not include a radar signal.

公开(公告)号：US20200321928A1

公开(公告)日：2020-10-08

申请号：US16851558

申请日：2020-04-17

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sandeep Rao ,  Brian Gingsburg

IPC: H03F3/217 ,  H03B5/12 ,  H01Q1/22 ,  H01Q3/26 ,  H03F3/24 ,  H03F3/45 ,  G01S3/14 ,  G01S13/34 ,  G01S7/35 ,  G01S13/931 ,  G01S13/42

Abstract: Disclosed examples include a radar system that operates in a first mode and a second mode. In the first mode, the system detects the presence of an object within a threshold range. In response to detection of the presence of the object, the system transitions to the second mode, and the system generates range data, velocity data, and angle data of the object in the second mode. When the object is no longer detected within the threshold range, the system transitions back to the first mode.

公开(公告)号：US10725162B2

公开(公告)日：2020-07-28

申请号：US15661891

申请日：2017-07-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sandeep Rao

IPC: G01S13/06 ,  G01S7/35 ,  G01S13/42 ,  G01S13/931 ,  H01Q3/26 ,  H01Q25/00

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.

公开(公告)号：US20190087009A1

公开(公告)日：2019-03-21

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 ,  G01S13/58 ,  G01S7/35 ,  G01S7/41

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：US10067221B2

公开(公告)日：2018-09-04

申请号：US14679461

申请日：2015-04-06

Applicant: Texas Instruments Incorporated

Inventor： Brian Paul Ginsburg ,  Karthik Subburaj ,  Karthik Ramasubramanian ,  Sachin Bhardwaj ,  Sriram Murali ,  Sandeep Rao

IPC: G01S7/35 ,  G01S7/40 ,  G01S13/32 ,  G01S13/93 ,  G01S7/02 ,  G01S13/00

Abstract: A frequency modulated continuous wave (FMCW) radar system is provided that includes a receiver configured to generate a digital intermediate frequency (IF) signal, and an interference monitoring component coupled to the receiver to receive the digital IF signal, in which the interference monitoring component is configured to monitor at least one sub-band in the digital IF signal for interference, in which the at least one sub-band does not include a radar signal.

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

IPC: G01S7/35 ,  G01S13/58

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.

公开(公告)号：US20180003798A1

公开(公告)日：2018-01-04

申请号：US15702561

申请日：2017-09-12

Applicant: Texas Instruments Incorporated

Inventor： Sandeep Rao ,  Saurabh Khanna

IPC: G01S7/03 ,  H01Q3/26 ,  H01Q3/24 ,  H01Q1/32 ,  G01S13/93 ,  G01S13/42 ,  G01S13/34 ,  H01Q21/08 ,  G01S7/35

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.

公开(公告)号：US09753120B2

公开(公告)日：2017-09-05

申请号：US14521325

申请日：2014-10-22

Applicant: Texas Instruments Incorporated

Inventor： Karthik Ramasubramanian ,  Sandeep Rao

IPC: G01S13/93 ,  G01S7/02 ,  G01S13/08 ,  G01S13/34 ,  G01S7/35 ,  G01S7/03

CPC classification number: G01S7/02 ,  G01S7/03 ,  G01S7/354 ,  G01S13/08 ,  G01S13/343 ,  G01S13/931 ,  G01S2007/356

Abstract: The disclosure provides a radar apparatus fur estimating a distance of the one or more obstacles in a range of interest. The radar apparatus includes a local oscillator that generates a first ramp segment having a first start frequency. A frequency shifter receives the first ramp segment and generates a transmit signal and a mixer signal. The transmit signal is scattered by a one or more obstacles in the range of interest to generate the scattered signal. A mixer mixes the scattered signal and the mixer signal to generate a non-zero IF signal which is filtered to generate a filtered non-zero IF signal. An ADC (analog to digital converter) samples the filtered non-zero IF signal to generate a valid data. A DSP (digital signal processor) processes the valid data for estimating the distance of the one or more obstacles.

公开(公告)号：US20170192847A1

公开(公告)日：2017-07-06

申请号：US14985851

申请日：2015-12-31

Applicant: Texas Instruments Incorporated

Inventor： Sandeep Rao ,  Karthik Ramasubramanian ,  Brian Paul Ginsburg

IPC: G06F11/10 ,  G01S7/35 ,  G06F3/06

CPC classification number: G06F11/1076 ,  G01S7/352 ,  G01S13/34 ,  G01S13/42 ,  G01S13/583 ,  G01S13/931 ,  G01S2007/356 ,  G06F3/0619 ,  G06F3/064 ,  G06F3/0673 ,  G06F11/1012

Abstract: Data memory protection is provided for a signal processing system such as a radar system in which the data memory is protected with a common set of parity bits rather than requiring a set of parity bits for each memory word as in Error Correction Coded (ECC) memories. The common set of parity bits may be updated as memory words in the data memory are accessed as part of signal processing of one or more digital signals. The memory protection ensures that in the absence of memory errors the common parity bits are zero at the end of processing the digital signals as long as each word in the data memory that is used for storing the signal processing data is written and read an equal number of times.