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    Synchronization in FMCW radar systems
    2.
    发明授权
    Synchronization in FMCW radar systems 有权

    公开(公告)号：US10649069B2

    公开(公告)日：2020-05-12

    申请号：US15635659

    申请日：2017-06-28

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Karthik Ramasubramanian ,  Karthik Subburaj ,  Sachin Bhardwaj

    IPC: G01S13/90 ,  G01S7/35 ,  G01S13/58 ,  G01S13/931 ,  G01S13/34 ,  G01S13/72 ,  G01S13/02

    Abstract: The disclosure provides a radar apparatus for estimating a position and a velocity of the plurality of obstacles. The radar apparatus includes a local oscillator that generates a first signal. A first transmit unit receives the first signal from the local oscillator and generates a first transmit signal. A frequency shifter receives the first signal from the local oscillator and generates a second signal. A second transmit unit receives the second signal and generates a second transmit signal. The frequency shifter provides a frequency offset to the first signal based on a routing delay mismatch to generate the second signal such that the first transmit signal is phase coherent with the second transmit signal.

    METHOD, SYSTEM AND APPARATUS FOR VEHICULAR NAVIGATION USING INERTIAL SENSORS
    3.
    发明申请
    METHOD, SYSTEM AND APPARATUS FOR VEHICULAR NAVIGATION USING INERTIAL SENSORS 有权
    使用惯性传感器进行车辆导航的方法，系统和装置

    公开(公告)号：US20150088419A1

    公开(公告)日：2015-03-26

    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。

    Kalman filter iteratively performing time/measurement update of user/relative floor locations
    5.
    发明授权
    Kalman filter iteratively performing time/measurement update of user/relative floor locations 有权
    卡尔曼滤波器迭代地执行用户/相对楼层位置的时间/测量更新

    公开(公告)号：US09374678B2

    公开(公告)日：2016-06-21

    申请号：US14194449

    申请日：2014-02-28

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Pankaj Gupta ,  Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan ,  Sachin Bhardwaj

    IPC: H04W4/04

    CPC classification number: H04W4/043

    Abstract: Several systems and methods for location estimation in a multi-floor environment are disclosed. In an embodiment, the method includes performing wireless scanning so as to receive wireless signals from one or more access points from among a plurality of access points positioned at plurality of locations, respectively at one or more floors from among a plurality of floors within the multi-floor environment. A first set of RSSI measurements is computed corresponding to the wireless signals. Absolute floor location information is determined based on the first set of RSSI measurements and a pre-defined objective function. The pre-defined objective function is configured to maximize a probability of a user being located at a floor so as to receive the wireless signals. A user floor location is determined based on the absolute floor location information. The user location is estimated at least in part based on the user floor location.

    Abstract translation: 公开了用于多层环境中的位置估计的几种系统和方法。 在一个实施例中，该方法包括执行无线扫描，以便从位于多个接入点内的多个接入点中的多个接入点接收无线信号，所述多个接入点分别位于多个接入点内的多个接入点 - 地板环境。 对应于无线信号计算第一组RSSI测量。 基于第一组RSSI测量和预定义的目标函数来确定绝对楼层位置信息。 预定义的目标函数被配置为最大化用户位于楼层的概率以便接收无线信号。 基于绝对楼层位置信息确定用户楼层位置。 至少部分地基于用户楼层位置来估计用户位置。

    SYNCHRONIZATION IN FMCW RADAR SYSTEMS
    6.
    发明申请
    SYNCHRONIZATION IN FMCW RADAR SYSTEMS 审中-公开
    FMCW雷达系统同步

    公开(公告)号：US20150276918A1

    公开(公告)日：2015-10-01

    申请号：US14637218

    申请日：2015-03-03

    Applicant: Texas Instruments Incorporated

    Inventor： Karthik Ramasubramanian ,  Karthik Subburaj ,  Sachin Bhardwaj

    IPC: G01S7/02 ,  G01S13/06 ,  G01S13/58 ,  G01S13/02

    CPC classification number: G01S7/35 ,  G01S13/343 ,  G01S13/584 ,  G01S13/726 ,  G01S13/931 ,  G01S2013/0245

    Abstract: The disclosure provides a radar apparatus for estimating a position and a velocity of the plurality of obstacles. The radar apparatus includes a local oscillator that generates a first signal. A first transmit unit receives the first signal from the local oscillator and generates a first transmit signal. A frequency shifter receives the first signal from the local oscillator and generates a second signal. A second transmit unit receives the second signal and generates a second transmit signal. The frequency shifter provides a frequency offset to the first signal based on a routing delay mismatch to generate the second signal such that the first transmit signal is phase coherent with the second transmit signal.

    Abstract translation: 本公开提供了一种用于估计多个障碍物的位置和速度的雷达装置。 雷达装置包括产生第一信号的本地振荡器。 第一发送单元从本地振荡器接收第一信号并产生第一发送信号。 频移器从本地振荡器接收第一信号并产生第二信号。 第二发送单元接收第二信号并产生第二发送信号。 移频器基于路由延迟失配向第一信号提供频率偏移以产生第二信号，使得第一发射信号与第二发射信号相位相干。

    Synchronization in FMCW Radar Systems
    7.
    发明申请
    Synchronization in FMCW Radar Systems 审中-公开

    公开(公告)号：US20170299693A1

    公开(公告)日：2017-10-19

    申请号：US15635659

    申请日：2017-06-28

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Karthik Ramasubramanian ,  Karthik Subburaj ,  Sachin Bhardwaj

    IPC: G01S7/35 ,  G01S13/58

    CPC classification number: G01S7/35 ,  G01S13/343 ,  G01S13/584 ,  G01S13/726 ,  G01S13/931 ,  G01S2013/0245

    Abstract: The disclosure provides a radar apparatus for estimating a position and a velocity of the plurality of obstacles. The radar apparatus includes a local oscillator that generates a first signal. A first transmit unit receives the first signal from the local oscillator and generates a first transmit signal. A frequency shifter receives the first signal from the local oscillator and generates a second signal. A second transmit unit receives the second signal and generates a second transmit signal. The frequency shifter provides a frequency offset to the first signal based on a routing delay mismatch to generate the second signal such that the first transmit signal is phase coherent with the second transmit signal.

    Auxiliary as vehicle speed when difference between auxiliary and propagation above threshold
    9.
    发明授权
    Auxiliary as vehicle speed when difference between auxiliary and propagation above threshold 有权
    当辅助和传播之间的差异超过阈值时，辅助作为车速

    公开(公告)号：US09140802B2

    公开(公告)日：2015-09-22

    申请号：US13958765

    申请日：2013-08-05

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Sachin Bhardwaj ,  Jaiganesh Balakrishnan ,  Sriram Murali

    IPC: G01S19/49 ,  G01C21/16

    CPC classification number: G01S19/49 ,  G01C21/16

    Abstract: In the present disclosure, an error in the velocity and position computed from a three dimensional IMU measurement is reduced confined by computing an auxiliary speed in a drive direction of a vehicle from an angular velocity measurement and a lateral acceleration measurement. The auxiliary speed is then compared with the speed computed from the acceleration measurement. The auxiliary speed is provided as the speed of the vehicle mounted with the IMU when the absolute difference between the auxiliary speed and the speed computed from the acceleration measurement in the drive direction is above a threshold. The auxiliary speed is computed when the vehicle is detected to be in a curved motion. According to another aspect of the present disclosure, the bias errors are determined when the vehicle is in a steady state, at rest or in a straight line motion. The bias errors are used to obtain the accurate auxiliary measurement.

    Abstract translation: 在本公开中，通过从角速度测量和横向加速度测量计算车辆的驱动方向上的辅助速度来限制从三维IMU测量计算的速度和位置的误差。 然后将辅助速度与从加速度测量计算的速度进行比较。 当辅助速度和从驱动方向上的加速度测量计算的速度之间的绝对差高于阈值时，辅助速度被提供为安装有IMU的车辆的速度。 当检测到车辆处于弯曲运动时，计算辅助速度。 根据本公开的另一方面，当车辆处于稳定状态，静止或直线运动时，确定偏置误差。 偏置误差用于获得准确的辅助测量。

    METHOD, SYSTEM AND APPARATUS FOR REDUCING THE EFFECT OF INERTIAL SENSOR'S ERROR IN A VEHICULAR NAVIGATION
    10.
    发明申请
    METHOD, SYSTEM AND APPARATUS FOR REDUCING THE EFFECT OF INERTIAL SENSOR'S ERROR IN A VEHICULAR NAVIGATION 有权
    方法，系统和装置，用于降低传感器误差在车辆导航中的影响

    公开(公告)号：US20150039154A1

    公开(公告)日：2015-02-05

    申请号：US13958765

    申请日：2013-08-05

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Sachin Bhardwaj ,  Jaiganesh Balakrishnan ,  Sriram Murali

    IPC: G01S19/49

    CPC classification number: G01S19/49 ,  G01C21/16

    Abstract: In the present disclosure, an error in the velocity and position computed from a three dimensional IMU measurement is reduced confined by computing an auxiliary speed in a drive direction of a vehicle from an angular velocity measurement and a lateral acceleration measurement. The auxiliary speed is then compared with the speed computed from the acceleration measurement. The auxiliary speed is provided as the speed of the vehicle mounted with the IMU when the absolute difference between the auxiliary speed and the speed computed from the acceleration measurement in the drive direction is above a threshold. The auxiliary speed is computed when the vehicle is detected to be in a curved motion. According to another aspect of the present disclosure, the bias errors are determined when the vehicle is in a steady state, at rest or in a straight line motion. The bias errors are used to obtain the accurate auxiliary measurement.

    Abstract translation: 在本公开中，通过从角速度测量和横向加速度测量计算车辆的驱动方向上的辅助速度来限制从三维IMU测量计算的速度和位置的误差。 然后将辅助速度与从加速度测量计算的速度进行比较。 当辅助速度和从驱动方向上的加速度测量计算的速度之间的绝对差高于阈值时，辅助速度被提供为安装有IMU的车辆的速度。 当检测到车辆处于弯曲运动时，计算辅助速度。 根据本公开的另一方面，当车辆处于稳定状态，静止或直线运动时，确定偏置误差。 偏置误差用于获得准确的辅助测量。

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