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    LOW-COMPLEXITY INVERSE SINC FOR RF SAMPLING TRANSMITTERS
    3.
    发明申请
    LOW-COMPLEXITY INVERSE SINC FOR RF SAMPLING TRANSMITTERS 有权

    公开(公告)号：US20220029644A1

    公开(公告)日：2022-01-27

    申请号：US17492710

    申请日：2021-10-04

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Jaiganesh Balakrishnan ,  Sriram Murali ,  Sundarrajan Rangachari ,  Yeswanth Guntupalli

    IPC: H04B1/00

    Abstract: A radio-frequency (RF) sampling transmitter (e.g., of the type that may be used in 5G wireless base stations) includes a complex baseband digital-to-analog converter (DAC) response compensator that operates on a complex baseband signal at a sampling rate lower than the sampling rate of an RF sampling DAC in the RF sampling transmitter. The DAC response compensator flattens the sample-and-hold response of the RF sampling DAC only in the passband of interest, addressing the problem of a sin c response introduced by the sample-and-hold operation of the RF sampling DAC and avoiding the architectural complexity and high power consumption of an inverse sin c filter that operates on the signal at a point in the signal chain after it has already been up-converted to an RF passband.

    MULTI-MODE RADAR SYSTEMS, SIGNAL PROCESSING METHODS AND CONFIGURATION METHODS USING PUSHING WINDOWS
    4.
    发明申请
    MULTI-MODE RADAR SYSTEMS, SIGNAL PROCESSING METHODS AND CONFIGURATION METHODS USING PUSHING WINDOWS 有权

    公开(公告)号：US20210286066A1

    公开(公告)日：2021-09-16

    申请号：US17330477

    申请日：2021-05-26

    Applicant: Texas Instruments Incorporated

    Inventor： Sachin Bharadwaj ,  Sriram Murali

    IPC: G01S13/42 ,  G01S13/931 ,  G01S13/34

    Abstract: A multi-mode radar system, radar signal processing methods and configuration methods, including using predetermined, range/mode-specific pushing windows to perform windowing on range and velocity object data before performing an FFT 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.

    NOISE MITIGATION IN RADAR SYSTEMS
    5.
    发明申请
    NOISE MITIGATION IN RADAR SYSTEMS 有权

    公开(公告)号：US20210011118A1

    公开(公告)日：2021-01-14

    申请号：US17020931

    申请日：2020-09-15

    Applicant: Texas Instruments Incorporated

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

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

    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.

    Dithered M by N clock dividers
    6.
    发明授权
    Dithered M by N clock dividers 有权

    公开(公告)号：US10651863B1

    公开(公告)日：2020-05-12

    申请号：US16269473

    申请日：2019-02-06

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Sundarrajan Rangachari ,  Sriram Murali ,  Sanjay Pennam

    IPC: H03L7/197 ,  G06F7/58 ,  H03K3/84 ,  H03K21/10 ,  H03K21/02

    Abstract: A method for dithering a fractional clock divider includes generating a first clock enable sequence based on a seed pattern of M ones and N minus M zeros, selecting a cyclic rotation of the seed pattern after N input clock cycles, and generating a second clock enable sequence based on the cyclic rotation. A clock gate receives the input clock signal and the clock enable sequences and outputs M clock cycles for every N input clock cycles. A random number generator indicates the cyclic rotation of the seed pattern. The seed pattern can be replaced with an updated seed pattern of M ones and N minus M zeros in a different order. In some examples, the clock enable sequence is generated using a cyclic shift register containing the seed pattern and a multiplexor. In other examples, the clock enable sequence is generated using a modulo N counter and a comparator.

    Auxiliary as vehicle speed when difference between auxiliary and propagation above threshold
    8.
    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
    9.
    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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