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    Undocking and re-docking mobile device inertial measurement unit from vehicle
    42.
    发明授权
    Undocking and re-docking mobile device inertial measurement unit from vehicle 有权
    移动设备惯性测量单元从车辆拆卸和重新对接

    公开(公告)号：US09383209B2

    公开(公告)日：2016-07-05

    申请号：US14034486

    申请日：2013-09-23

    Applicant: Texas Instruments Incorporated

    Inventor： Sachin Bhardwaj ,  Sriram Murali ,  Jaiganesh Balakrishnan ,  Jayawardan Janardhanan ,  Yogesh Shekar ,  Goutam Dutta

    IPC: G01C21/16 ,  G01C21/20

    CPC classification number: G01C21/165 ,  G01C21/16 ,  G01C21/20

    Abstract: According to an aspect of the present disclosure, the relative attitude between an inertial measurement unit (IMU), present on a mobile device, and the frame of reference of the vehicle carrying mobile device is estimated. The estimated relative attitude is used to translate the IMU measurement to the vehicle frame of reference to determine the velocity and position of the vehicle. As a result, the vehicle position and velocity are determined accurately in the event of undocking and re-docking of the mobile device from a docking system in the vehicle. The relative attitude is estimated in terms of pitch, roll, and yaw angles.

    Abstract translation: 根据本公开的一个方面，估计出现在移动设备上的惯性测量单元（IMU）与携带移动设备的车辆的参考系之间的相对姿态。 估计的相对姿态用于将IMU测量值转换为车辆参考系，以确定车辆的速度和位置。 结果，在移动设备从车辆中的对接系统脱离和重新对接的情况下，准确地确定车辆位置和速度。 根据俯仰角，俯仰角和偏航角估计相对姿态。

    MULTI-MODE RADAR SYSTEMS, SIGNAL PROCESSING METHODS AND CONFIGURATION METHODS USING PUSHING WINDOWS
    43.
    发明申请
    MULTI-MODE RADAR SYSTEMS, SIGNAL PROCESSING METHODS AND CONFIGURATION METHODS USING PUSHING WINDOWS 有权

    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.

    In phase (I) and quadrature (Q) imbalance estimation in a radar system
    45.
    发明授权
    In phase (I) and quadrature (Q) imbalance estimation in a radar system 有权

    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.

    Maximum Measurable Velocity in Frequency Modulated Continuous Wave (FMCW) Radar
    47.
    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.

    Dynamic IQ mismatch correction in FMCW radar
    49.
    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.

    Phase coherent numerically controlled oscillator
    50.
    发明授权
    Phase coherent numerically controlled oscillator 有权

    公开(公告)号：US11418148B2

    公开(公告)日：2022-08-16

    申请号：US16953666

    申请日：2020-11-20

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Nagalinga Swamy Basayya Aremallapur ,  Sriram Murali ,  Jawaharlal Tangudu

    IPC: G06F1/02 ,  H03L7/099 ,  H03L7/16 ,  G06F1/03 ,  H03B21/02

    Abstract: A phase coherent NCO circuit includes a base frequency NCO, a phase seeding circuit, a scaled frequency NCO, a sine/cosine generator. The base frequency NCO is configured to generate base phase values based on a base frequency control word. The phase seeding circuit is coupled to the base frequency NCO. The phase seeding circuit is configured to generate a seed phase value based on the base phase values and a scale factor value. The scaled frequency NCO is coupled to the phase seeding circuit. The scaled frequency NCO is configured to generate oscillator phase values based on the phase seed value and an oscillator frequency control word. The sine/cosine generator is coupled to the scaled frequency NCO. The sine/cosine generator is configured to generate oscillator output samples based on the oscillator phase values.

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