公开(公告)号：US20200033462A1

公开(公告)日：2020-01-30

申请号：US16364691

申请日：2019-03-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： LEI DING ,  SRINATH MATHUR RAMASWAMY ,  VAIBHAV GARG ,  ANAND GOPALAN

IPC: G01S7/536 ,  G01S15/32

Abstract: In an ultrasonic detection system that uses frequency-modulation coding to distinguish emitted bursts from multiple transducers, a receiver associated with a transducer uses dynamic thresholding to discriminate valid echoes from system and environmental noise in multiple envelope signals produced by multiple correlators. The time-varying dynamic thresholds are generated from the mean of noise in a respective envelope derived from the output of a respective correlator. Multiple thresholds can be combined together such that a single time-varying threshold is applied to all correlators' envelopes. Such thresholding has the benefits of a constant false-alarm rate with regard to detection of echoes (as opposed to false triggering from noise), and, owing to finer-resolution and adaptive thresholds, can detect targets or obstacles as further distances and with greater time responsiveness.

公开(公告)号：US20190339386A1

公开(公告)日：2019-11-07

申请号：US16364652

申请日：2019-03-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： LEI DING ,  SRINATH MATHUR RAMASWAMY ,  ANAND GOPALAN ,  VAIBHAV GARG ,  ANAND GANESH DABAK ,  BAHER S. HAROUN

IPC: G01S15/10 ,  G01S15/93 ,  G01S15/58 ,  G01S15/32

Abstract: In an ultrasonic detection system that uses frequency-modulation or phase-modulation coding to distinguish emitted bursts from multiple transducers, a receiver associated with a transducer uses peak search, peak buffer, and peak rank stages in one or more receiver signal processing paths to identify valid received ultrasonic signal envelope peaks in correlator outputs. The peak rank stage can support different modes respectively designed to handle one code, two or more codes, or two or more codes with support for Doppler frequency shift detection. Valid peak information (e.g., amplitude and time) can be reported to a central controller and/or stored locally in a fusion stage to generate more intelligent information for targets or obstacles using peaks from multiple bursts.

公开(公告)号：US20220035031A1

公开(公告)日：2022-02-03

申请号：US17503407

申请日：2021-10-18

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： LEI DING ,  SRINATH MATHUR RAMASWAMY ,  ANAND GOPALAN

IPC: G01S15/931 ,  G01S15/32 ,  G01S15/10 ,  G01S15/58 ,  G01S7/527 ,  G02B7/40 ,  B25J19/02 ,  G01S3/808

Abstract: Ultrasonic ranging systems and methods that emit coded bursts and correlate transduced acoustical echoes of the bursts with a receive template characterizing a burst code to determine time-of-flight information use receive templates of time-variable length to improve short-range object detection. The template length is based on a time index measured from the start of the burst emission. The detection can account for a dead zone of transducer ringing following a burst. A time-variable gain that is also based on the time index can be applied to the correlated signal. The length and gain can be adjusted with reduced temporal frequency to reduce computation cost.

公开(公告)号：US20210156995A1

公开(公告)日：2021-05-27

申请号：US16694506

申请日：2019-11-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： LEI DING ,  SRINATH MATHUR RAMASWAMY ,  ANAND GOPALAN

IPC: G01S15/931 ,  G01S15/32 ,  G01S15/10 ,  G01S15/58 ,  G01S3/808 ,  G01S7/527 ,  G02B7/40 ,  B25J19/02

Abstract: Ultrasonic ranging systems and methods that emit coded bursts and correlate transduced acoustical echoes of the bursts with a receive template characterizing a burst code to determine time-of-flight information use receive templates of time-variable length to improve short-range object detection. The template length is based on a time index measured from the start of the burst emission. The detection can account for a dead zone of transducer ringing following a burst. A time-variable gain that is also based on the time index can be applied to the correlated signal. The length and gain can be adjusted with reduced temporal frequency to reduce computation cost.

公开(公告)号：US20200309945A1

公开(公告)日：2020-10-01

申请号：US16364613

申请日：2019-03-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： LEI DING ,  SRINATH MATHUR RAMASWAMY ,  ANAND GOPALAN ,  MICHAEL JOHN ZROKA

IPC: G01S15/10 ,  G01S7/524

Abstract: Ultrasonic sensing systems and associated methods provide side-lobe reduction to improve the acoustic detection of small objects, the signature envelope peaks of which can otherwise be obscured by subsidiary envelope peaks in side lobes that result from residual correlation between a signal received by an ultrasonic transducer and a template signal corresponding to a burst signal emitted by the ultrasonic transducer. A shaping signal by which the amplitude of the burst signal can be varied with respect to time is taken into account in the template signal, and correlator circuitry correlates a signal derived from the ultrasonic transducer with the template signal to produce a correlated output exhibiting the desired side-lobe reduction. The distance from the transducer to the detected object can thereby be determined with enhanced accuracy and responsiveness.