Patents by Inventor Sandeep Rao

Sandeep Rao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10240931
    Abstract: A disclosed method includes computing, for each of a plurality of values of at least one type of error parameter, a distance traveled for each of a plurality of directions of travel. The method includes selecting, from the plurality of values of the at least one type of error parameter, a value that provides a greatest distance traveled for any of the plurality of directions of travel relative to the unselected ones of the plurality of values. The method further includes applying the selected value of the at least one type of error parameter to gyroscopic sensor data, and then determining navigation information based on the gyroscopic sensor data with the selected value of the at least one type of error parameter applied.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: March 26, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Sandeep Rao, Deric Wayne Waters
  • Publication number: 20190087009
    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.
    Type: Application
    Filed: April 13, 2018
    Publication date: March 21, 2019
    Inventors: Sandeep Rao, Sachin Bharadwaj, Piyali Goswami
  • Patent number: 10234542
    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.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: March 19, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Karthik Subburaj, Brian Paul Ginsburg, Daniel Colum Breen, Sandeep Rao, Karthik Ramasubramanian
  • Publication number: 20190044485
    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.
    Type: Application
    Filed: August 4, 2017
    Publication date: February 7, 2019
    Applicant: Texas Instruments Incorporated
    Inventors: Sandeep Rao, Brian Ginsburg
  • Publication number: 20190044578
    Abstract: The apparatus may be an apparatus for wireless communication. The apparatus for wireless communication may include a processing system. The processing system may manage an antenna beam. The processing system may be configured to monitor a parameter of a signal and widen the antenna beam of the apparatus for wireless communication when the parameter falls below a threshold.
    Type: Application
    Filed: August 2, 2017
    Publication date: February 7, 2019
    Inventors: Sandeep RAO, Defang CHEN, Shan QING
  • Publication number: 20190011533
    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.
    Type: Application
    Filed: August 31, 2018
    Publication date: January 10, 2019
    Inventors: Brian Paul Ginsburg, Karthik Subburaj, Karthik Ramasubramanian, Sachin Bhardwaj, Sriram Murali, Sandeep Rao
  • Publication number: 20190004167
    Abstract: The disclosure provides a radar apparatus for estimating a range of an obstacle. The radar apparatus includes a local oscillator that generates a first ramp segment and a second ramp segment. The first ramp segment and the second ramp segment each includes a start frequency, a first frequency and a second frequency. The first frequency of the second ramp segment is equal to or greater than the second frequency of the first ramp segment when a slope of the first ramp segment and a slope of the second ramp segment are equal and positive. The first frequency of the second ramp segment is equal to or less than the second frequency of the first ramp segment when the slope of the first ramp segment and the slope of the second ramp segment are equal and negative.
    Type: Application
    Filed: September 5, 2018
    Publication date: January 3, 2019
    Inventors: Sandeep Rao, Karthik Subburaj, Brian Ginsburg, Karthik Ramasubramanian, Jawaharlal Tangudu, Sachin Bharadwaj
  • Publication number: 20180372840
    Abstract: The disclosure provides a radar apparatus. The radar apparatus includes a transmitter that transmits a first chirp. The first chirp is scattered by one or more obstacles to generate a first plurality of scattered signals. A plurality of receivers receives the first plurality of scattered signals. Each receiver of the plurality of receivers generates a digital signal in response to a scattered signal of the first plurality of scattered signals. A processor is coupled to the plurality of receivers and receives the digital signals from the plurality of receivers. The processor performs range FFT (fast fourier transform) and angle FFT on the digital signals received from the plurality of receivers to generate a first matrix of complex samples.
    Type: Application
    Filed: August 21, 2018
    Publication date: December 27, 2018
    Inventors: Sandeep Rao, Karthik Ramasubramanian
  • Publication number: 20180292510
    Abstract: A cascaded radar system includes a device that is cascaded to another device to form a virtual antenna array, which may be used by each cascaded device to receive a return-microwave radar signal. A determination of a common dominant signal from the cascaded devices may be used to determine a phase mismatch, which is further utilized as a basis for adjusting a signal phase of the formed virtual antenna of the cascaded radar system.
    Type: Application
    Filed: August 31, 2017
    Publication date: October 11, 2018
    Applicant: Texas Instruments Incorporated
    Inventors: Sandeep Rao, Brian Ginsburg
  • Patent number: 10094920
    Abstract: The disclosure provides a radar apparatus for estimating a range of an obstacle. The radar apparatus includes a local oscillator that generates a first ramp segment and a second ramp segment. The first ramp segment and the second ramp segment each includes a start frequency, a first frequency and a second frequency. The first frequency of the second ramp segment is equal to or greater than the second frequency of the first ramp segment when a slope of the first ramp segment and a slope of the second ramp segment are equal and positive. The first frequency of the second ramp segment is equal to or less than the second frequency of the first ramp segment when the slope of the first ramp segment and the slope of the second ramp segment are equal and negative.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: October 9, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Sandeep Rao, Karthik Subburaj, Brian Ginsburg, Karthik Ramasubramanian, Jawaharlal Tangudu, Sachin Bharadwaj
  • Patent number: 10078131
    Abstract: The disclosure provides a radar apparatus. The radar apparatus includes a transmitter that transmits a first chirp. The first chirp is scattered by one or more obstacles to generate a first plurality of scattered signals. A plurality of receivers receives the first plurality of scattered signals. Each receiver of the plurality of receivers generates a digital signal in response to a scattered signal of the first plurality of scattered signals. A processor is coupled to the plurality of receivers and receives the digital signals from the plurality of receivers. The processor performs range FFT (fast fourier transform) and angle FFT on the digital signals received from the plurality of receivers to generate a first matrix of complex samples.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: September 18, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Sandeep Rao, Karthik Ramasubramanian
  • Patent number: 10067221
    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.
    Type: Grant
    Filed: April 6, 2015
    Date of Patent: September 4, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Brian Paul Ginsburg, Karthik Subburaj, Karthik Ramasubramanian, Sachin Bhardwaj, Sriram Murali, Sandeep Rao
  • Publication number: 20180172813
    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 ?T, wherein ?T=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.
    Type: Application
    Filed: August 1, 2017
    Publication date: June 21, 2018
    Inventors: Sandeep Rao, Karthik Subburaj, Sriram Murali, Karthik Ramasubramanian
  • Publication number: 20180011170
    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 (?d) 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 ?d 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.
    Type: Application
    Filed: December 7, 2016
    Publication date: January 11, 2018
    Inventors: Sandeep Rao, Karthik Subburaj, Dan Wang, Adeel Ahmad
  • Publication number: 20180003798
    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.
    Type: Application
    Filed: September 12, 2017
    Publication date: January 4, 2018
    Inventors: Sandeep Rao, Saurabh Khanna
  • Publication number: 20170363711
    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.
    Type: Application
    Filed: June 16, 2016
    Publication date: December 21, 2017
    Inventors: SANDEEP RAO, KARTHIK RAMASUBRAMANIAN, INDU PRATHAPAN, RAGHU GANESAN, PANKAJ GUPTA
  • Publication number: 20170363714
    Abstract: A device includes a circuit board having thereon, a controlling component, a first radar chip and a second radar chip. The first radar chip includes a first radar transmission antenna, a second radar transmission antenna and a first radar receiver antenna array. The second radar chip includes a second radar receiver antenna array. The controlling component can control the first radar chip and the second radar chip. The first radar transmission antenna can transmit a first radar transmission signal. The second radar transmission antenna can transmit a second radar transmission signal. The second radar chip is spaced from the first radar chip so as to create a virtual receiver antenna array between the first radar receiver antenna array and the second radar receiver antenna array.
    Type: Application
    Filed: August 14, 2017
    Publication date: December 21, 2017
    Inventors: Sandeep Rao, Karthik Ramasubramanian, Brian Ginsburg, Jawaharial Tangudu, Karthik Subburaj
  • Patent number: 9829566
    Abstract: Radar detection of an object is achieved by identifying a first range associated with a possible object based on a first return from a first radar transmission having a first chirp rate, and identifying a second range associated with the possible object based on a second return from a second radar transmission having a second chirp rate that differs from the first chirp rate. The first and second ranges are evaluated together to determine whether the possible object is a true object.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: November 28, 2017
    Assignee: Texas Instruments Incorporated
    Inventors: Sandeep Rao, Karthik Subburaj
  • Patent number: 9817109
    Abstract: A method for operating a frequency modulated continuous wave (FMCW) radar system is provided that includes generating digital intermediate frequency (IF) signals from radio frequency signals received by a small receive antenna array in the FMCW radar system and processing the digital IF signals to determine whether or not a gesture was performed.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: November 14, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Krishnakant Vijay Saboo, Sandeep Rao
  • Publication number: 20170322296
    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.
    Type: Application
    Filed: July 27, 2017
    Publication date: November 9, 2017
    Inventor: Sandeep Rao