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公开(公告)号：US10104621B2
公开(公告)日：2018-10-16
申请号：US14972959
申请日：2015-12-17
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Raghu Ganesan , Karthik Ramasubramanian , Sarma S. Gunturi
Abstract: Systems and methods are provided for packet detection in a wireless local area network transceiver. An antenna is configured to receive a signal, having a carrier frequency. A mixer is configured to mix the received signal with one of the in-phase and quadrature components of the local oscillator to produce a corresponding one of an in-phase downconverted signal and a quadrature phase downconverted signal. A packet detector is configured to determine, from the one of the in-phase downconverted signal and the quadrature phase downconverted signal, if the signal contains a packet of data and instruct a set of components associated with an other of the in-phase and quadrature components of the local oscillator to activate to process the received signal.
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公开(公告)号：US10101438B2
公开(公告)日：2018-10-16
申请号：US14687617
申请日：2015-04-15
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Karthik Ramasubramanian , Sriram Murali , Sreekiran Samala , Krishnanshu Dandu
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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公开(公告)号：US10094920B2
公开(公告)日：2018-10-09
申请号：US14470414
申请日：2014-08-27
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Subburaj , Brian Ginsburg , Karthik Ramasubramanian , Jawaharlal Tangudu , Sachin Bharadwaj
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.
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公开(公告)号：US10078131B2
公开(公告)日：2018-09-18
申请号：US14855057
申请日：2015-09-15
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Ramasubramanian
CPC classification number: G01S7/352 , G01S13/42 , G01S13/584 , G01S13/588 , G01S13/89 , G01S13/931 , G01S2007/356 , G01S2013/9332
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.
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公开(公告)号：US09880261B2
公开(公告)日：2018-01-30
申请号：US14503181
申请日：2014-09-30
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Brian Ginsburg , Karthik Ramasubramanian
Abstract: The disclosure provides a radar apparatus for estimating a position and a velocity of a plurality of obstacles. The radar apparatus includes a slave radar chip. A master radar chip is coupled to the slave radar chip. The master radar chip includes a local oscillator that generates a transmit signal. The slave radar chip receives the transmit signal on a first path and sends the transmit signal back to the master radar chip on a second path. A delay detect circuit is coupled to the local oscillator and receives the transmit signal from the slave radar chip on the second path and the transmit signal from the local oscillator. The delay detect circuit estimates a routing delay from the transmit signal received from the slave radar chip on the second path and from the transmit signal received from the local oscillator.
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Patent Agency Ranking
公开(公告)号：US09733340B2
公开(公告)日：2017-08-15
申请号：US14550774
申请日：2014-11-21
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Ramasubramanian , Brian Ginsburg , Jawaharlal Tangudu , Karthik Subburaj
CPC classification number: G01S7/032 , G01S13/343 , G01S13/931 , H01Q1/3233
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.
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公开(公告)号：US20170023663A1
公开(公告)日：2017-01-26
申请号：US14503181
申请日：2014-09-30
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Brian Ginsburg , Karthik Ramasubramanian
Abstract: The disclosure provides a radar apparatus for estimating a position and a velocity of a plurality of obstacles. The radar apparatus includes a slave radar chip. A master radar chip is coupled to the slave radar chip. The master radar chip includes a local oscillator that generates a transmit signal. The slave radar chip receives the transmit signal on a first path and sends the transmit signal back to the master radar chip on a second path. A delay detect circuit is coupled to the local oscillator and receives the transmit signal from the slave radar chip on the second path and the transmit signal from the local oscillator. The delay detect circuit estimates a routing delay from the transmit signal received from the slave radar chip on the second path and from the transmit signal received from the local oscillator.
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。 雷达装置包括从属雷达芯片。 主雷达芯片耦合到从属雷达芯片。 主雷达芯片包括产生发射信号的本地振荡器。 从属雷达芯片在第一路径上接收发射信号，并将发射信号发送回第二路径上的主雷达芯片。 延迟检测电路耦合到本地振荡器，并从第二路径上的从属雷达芯片接收发射信号和来自本地振荡器的发射信号。 延迟检测电路从从第二路径上的从雷达芯片接收的发送信号和从本地振荡器接收的发送信号估计路由延迟。
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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
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。
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49.发明申请公开(公告)号：US20150017939A1
公开(公告)日：2015-01-15
申请号：US14506001
申请日：2014-10-03
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Deric Wayne Waters , Sandeep Rao , Karthik Ramasubramanian
IPC: H04B17/00
Abstract: Embodiments of the invention provide a method for detecting false peaks in a Global Navigation Satellite System (GNSS) having a power control circuit, a measurement engine, and position engine. An estimated pseudorange is filtered over time. A false peak is declared if the filtered pseudorange error is greater than a threshold.
Abstract translation: 本发明的实施例提供了一种用于在具有功率控制电路，测量引擎和位置引擎的全球导航卫星系统（GNSS）中检测假峰值的方法。 估计伪距随时间过滤。 如果滤波的伪距误差大于阈值，则声明假峰。
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公开(公告)号：US08825397B2
公开(公告)日：2014-09-02
申请号：US13668381
申请日：2012-11-05
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Kasargod , Sandeep Rao , Karthik Ramasubramanian , Tarkesh Pande , Sriram Murali
CPC classification number: G01C21/12 , G01C21/165 , G01S19/42 , G01S19/45
Abstract: A vehicle navigation system includes a GNSS position engine (GPE) that uses GNSS satellite measurements to compute a first position and velocity of a vehicle and a first quality metric associated with the position and velocity. The system also includes a dead reckoning engine (DRE) that operates parallel with the GPE that computes a second position and velocity and a second quality metric associated with the dead reckoning. The GPE is configured to use the second position and velocity to detect a set of outliers in an incoming GNSS measurement; use the second position and velocity as an initial estimate of its position and velocity for a particular time instant, which is then refined by GNSS measurements received at that particular time instant; and to replace the first position and velocity with the second position and velocity.
Abstract translation: 车辆导航系统包括使用GNSS卫星测量来计算车辆的第一位置和速度以及与位置和速度相关联的第一质量度量的GNSS位置引擎（GPE）。 该系统还包括与计算第二位置和速度的GPE并行运行的航位推算引擎（DRE），以及与推算相关联的第二质量度量。 GPE被配置为使用第二位置和速度来检测进入GNSS测量中的一组异常值; 使用第二位置和速度作为其在特定时间瞬间的位置和速度的初始估计，然后通过在该特定时刻接收的GNSS测量来改进; 并用第二位置和速度来替换第一位置和速度。
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