-
公开(公告)号：US20200041551A1
公开(公告)日：2020-02-06
申请号：US16597612
申请日：2019-10-09
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Tom Altus , Karthik Subburaj , Sreekiran Samala , Raghu Ganesan
Abstract: A method of frequency estimation. A clock output from a frequency synthesizer is received at an input of a ring encoder. The ring encoder generates outputs including a ring encoder output clock and an encoded output which represents LSBs of a clock cycle count of the clock output. A binary counter is run using the ring encoder output clock which provides an output count which represents MSBs of the clock cycle count. Using a reference clock, the encoded output is sampled to provide a sampled encoded output and the output count is sampled to provide a sampled output count. Error correcting is applied to the sampled encoded output to provide a corrected sampled encoded output. The corrected sampled encoded output and sampled output count are combined to provide a combined output which is used for estimating an instantaneous or average frequency of the clock output.
-
公开(公告)号：US20200025871A1
公开(公告)日：2020-01-23
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
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.
-
公开(公告)号：US10234542B2
公开(公告)日：2019-03-19
申请号：US14870129
申请日：2015-09-30
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Brian Paul Ginsburg , Daniel Colum Breen , Sandeep Rao , Karthik Ramasubramanian
Abstract: Methods for monitoring of performance parameters of one or more receive channels and/or one or more transmit channels of a radar system-on-a-chip (SOC) are provided. The radar SOC may include a loopback path coupling at least one transmit channel to at least one receive channel to provide a test signal from the at least one transmit channel to the at least one receive channel when the radar SOC is operated in test mode. In some embodiments, the loopback path includes a combiner coupled to each of one or more transmit channels, a splitter coupled to each of one or more receive channels, and a single wire coupling an output of the combiner to an input of the splitter.
-
公开(公告)号：US20190004167A1
公开(公告)日：2019-01-03
申请号：US16121689
申请日：2018-09-05
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.
-
Patent Agency Ranking
公开(公告)号：US20180172813A1
公开(公告)日：2018-06-21
申请号：US15665663
申请日：2017-08-01
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Subburaj , Sriram Murali , Karthik Ramasubramanian
CPC classification number: G01S13/282 , G01S7/354 , G01S7/415 , G01S13/343 , G01S13/536 , G01S13/931 , G01S2007/356 , G06F17/13 , G06F17/142 , H04N5/23296
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.
-
公开(公告)号：US20180156910A1
公开(公告)日：2018-06-07
申请号：US15638106
申请日：2017-06-29
Applicant: Texas Instruments Incorporated
Inventor： Sachin Bharadwaj , Karthik Subburaj , Sriram Murali
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.
-
公开(公告)号：US09829566B2
公开(公告)日：2017-11-28
申请号：US14552505
申请日：2014-11-25
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Subburaj
CPC classification number: G01S7/023 , G01S7/28 , G01S7/354 , G01S13/34 , G01S13/343 , G01S13/38 , G01S13/583 , G01S13/931
Abstract: Radar detection of an object is achieved by identifying a first range associated with a possible object based on a first return from a first radar transmission having a first chirp rate, and identifying a second range associated with the possible object based on a second return from a second radar transmission having a second chirp rate that differs from the first chirp rate. The first and second ranges are evaluated together to determine whether the possible object is a true object.
-
公开(公告)号：US20160061942A1
公开(公告)日：2016-03-03
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
CPC classification number: G01S13/583 , G01S7/35 , G01S13/343 , G01S2013/9314
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.
Abstract translation: 本公开提供了一种用于估计障碍物的范围的雷达装置。 雷达装置包括产生第一斜坡段和第二斜坡段的本地振荡器。 第一斜坡段和第二斜坡段各自包括起始频率，第一频率和第二频率。 当第一斜坡段的斜率和第二斜坡段的斜率相等且为正时，第二斜坡段的第一频率等于或大于第一斜坡段的第二频率。 当第一斜坡段的斜率和第二斜坡段的斜率相等且为负时，第二斜坡段的第一频率等于或小于第一斜坡段的第二频率。
-
公开(公告)号：US20150097729A1
公开(公告)日：2015-04-09
申请号：US14337773
申请日：2014-07-22
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Jawaharlal Tangudu , Saurabh Khanna
IPC: G01S19/30
CPC classification number: G01S19/246 , G01S19/29
Abstract: A GNSS receiver to track low power GNSS satellite signals. The GNSS receiver includes a frequency locked loop (FLL) that measures a current doppler frequency of the satellite signal. A delay locked loop (DLL) measures a current code phase delay of the satellite signal. A current operating point corresponds to the current doppler frequency and the current code phase delay of the satellite signal. A grid monitor receives the satellite signal and the current operating point, and measures a satellite signal strength at a plurality of predefined offset points from the current operating point. The FLL and the DLL are centered at the current operating point. A peak detector is coupled to the grid monitor and processes the satellite signal strengths at the plurality of predefined offset points and re-centers the FLL and the DLL to a predefined offset point with the satellite signal strength above a predefined threshold.
Abstract translation: GNSS接收机，用于跟踪低功率GNSS卫星信号。 GNSS接收机包括测量卫星信号的当前多普勒频率的频率锁定环（FLL）。 延迟锁定环（DLL）测量卫星信号的当前码相位延迟。 当前操作点对应于当前多普勒频率和卫星信号的当前码相位延迟。 电网监视器接收卫星信号和当前工作点，并且测量来自当前工作点的多个预定偏移点处的卫星信号强度。 FLL和DLL以当前操作点为中心。 峰值检测器耦合到电网监视器并处理多个预定偏移点处的卫星信号强度，并使FLL和DLL重新定位到具有高于预定阈值的卫星信号强度的预定偏移点。
-
-
-
-
-
-
-
-
Search Results
109
records
(took 0.02 seconds)
