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    Maximum Measurable Velocity in Frequency Modulated Continuous Wave (FMCW) Radar
    82.
    发明申请
    Maximum Measurable Velocity in Frequency Modulated Continuous Wave (FMCW) Radar 有权

    公开(公告)号：US20220326368A1

    公开(公告)日：2022-10-13

    申请号：US17843069

    申请日：2022-06-17

    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

    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.

    Failure detection in a radar system
    83.
    发明授权
    Failure detection in a radar system 有权

    公开(公告)号：US11460543B2

    公开(公告)日：2022-10-04

    申请号：US16836836

    申请日：2020-03-31

    Applicant: Texas Instruments Incorporated

    Inventor： Karthik Ramasubramanian ,  Karthik Subburaj ,  Jasbir Singh Nayyar

    IPC: G01S7/35 ,  G01S7/40 ,  G01S13/931 ,  G01S13/34

    Abstract: A radar system is provided that includes a receive channel including a complex baseband and a processor coupled to the receive channel to receive a first plurality of digital intermediate frequency (IF) samples from an in-band (I) channel of the complex baseband and a corresponding second plurality of digital IF samples from a quadrature (Q) channel of the complex baseband, wherein the processor is configured to execute instructions to compute at least one failure metric based on the first plurality of digital IF samples and the second plurality of digital IF samples.

    Dynamic IQ mismatch correction in FMCW radar
    84.
    发明授权
    Dynamic IQ mismatch correction in FMCW radar 有权

    公开(公告)号：US11460540B2

    公开(公告)日：2022-10-04

    申请号：US16208276

    申请日：2018-12-03

    Applicant: Texas Instruments Incorporated

    Inventor： Pankaj Gupta ,  Sriram Murali ,  Karthik Ramasubramanian

    IPC: G01S7/35 ,  G01S13/34 ,  H03D1/22 ,  G01S7/40 ,  H03D7/16 ,  H03D3/00 ,  G01S13/931

    Abstract: A FMCW radar receiver includes a LO providing a chirped LO signal, an in-phase (I) channel for outputting I-data and a quadrature (Q) channel for outputting Q-data. A dynamic correction parameter generator generates IQ phase correction values (P[n]s) and IQ gain correction values (G[n]s) based on a frequency slope rate of the chirped LO signal for generating during intervals of chirps including a first sequence of P[n]s and G[n]s during a first chirp and a second sequence of P[n]s and G[n]s during a second chirp. An IQ mismatch (IQMM) correction circuit has a first IQMM input coupled to receive the I-data and a second IQMM input receiving the Q-data, and the P[n]s and G[n]s. During the first chirp the IQMM correction circuit provides first Q′-data and first I′-data and during the second chirp the IQMM correction circuit provides at least second Q′-data and second I′-data.

    TWO-DIMENSIONAL FFT COMPUTATION
    85.
    发明申请
    TWO-DIMENSIONAL FFT COMPUTATION 有权

    公开(公告)号：US20220128652A1

    公开(公告)日：2022-04-28

    申请号：US17572714

    申请日：2022-01-11

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Pankaj Gupta ,  Karthik Ramasubramanian

    IPC: G01S7/35 ,  G06F17/14 ,  H04L27/26

    Abstract: A system includes a hardware accelerator configured to perform a two-dimensional (2D) fast Fourier transform (FFT) on an M×N element array. The hardware accelerator has log2 M×N pipeline stages including an initial group of log2 M stages and a final group of log2 N stages. Each stage includes a butterfly unit, a FIFO buffer coupled to the butterfly unit, and a multiplier coupled to the butterfly unit and to an associated twiddle factor table. The hardware accelerator also includes butterfly control logic to provide elements of the M×N element array to the initial group of stages in an N direction of the array, and twiddle factor addressing logic to, for the twiddle factor tables of the initial group of stages, apply an indexed entry of the twiddle factor table to the associated multiplier. The indexed entry begins as a first entry and advances by N entries after every N cycles.

    Method and apparatus for FMCW radar processing
    86.
    发明授权
    Method and apparatus for FMCW radar processing 有权

    公开(公告)号：US11209522B2

    公开(公告)日：2021-12-28

    申请号：US16107000

    申请日：2018-08-21

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Sandeep Rao ,  Karthik Ramasubramanian

    IPC: G01S7/35 ,  G01S13/42 ,  G01S13/89 ,  G01S13/931 ,  G01S13/58

    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.

    Protecting Data Memory in a Signal Processing System
    88.
    发明申请
    Protecting Data Memory in a Signal Processing System 有权

    公开(公告)号：US20210248037A1

    公开(公告)日：2021-08-12

    申请号：US17242636

    申请日：2021-04-28

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Sandeep Rao ,  Karthik Ramasubramanian ,  Brian Paul Ginsburg

    IPC: G06F11/10 ,  G01S13/42 ,  G01S13/34 ,  G01S13/931 ,  G01S13/58 ,  G01S7/35 ,  G06F3/06

    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.

    Noise mitigation in radar systems
    89.
    发明授权
    Noise mitigation in radar systems 有权

    公开(公告)号：US10809353B2

    公开(公告)日：2020-10-20

    申请号：US16114490

    申请日：2018-08-28

    Applicant: Texas Instruments Incorporated

    Inventor： Karthik Subburaj ,  Karthik Ramasubramanian ,  Sriram Murali ,  Sreekiran Samala ,  Krishnanshu Dandu

    IPC: G01S13/00 ,  G01S7/292 ,  G01S13/88 ,  G01S7/35 ,  G01S13/34 ,  G01S7/03 ,  G01S7/02 ,  G01S7/41 ,  G01S13/04

    Abstract: A noise-mitigated continuous-wave frequency-modulated radar includes, for example, a transmitter for generating a radar signal, a receiver for receiving a reflected radar signal and comprising a mixer for generating a baseband signal in response to the received radar signal and in response to a local oscillator (LO) signal, and a signal shifter coupled to at least one of the transmitter, LO input of the mixer in the receiver and the baseband signal generated by the mixer. The impact of amplitude noise or phase noise associated with interferers, namely, for example, strong reflections from nearby objects, and electromagnetic coupling from transmit antenna to receive antenna, on the detection of other surrounding objects is reduced by configuring the signal shifter in response to an interferer frequency and phase offset.

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