Threshold generation for coded ultrasonic sensing

An ultrasonic and threshold technology, which is applied in the direction of reradiation of sound waves, radio wave measurement systems, and transmission of sensing components by fluid devices.

Pending Publication Date: 2020-02-11
TEXAS INSTR INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultrasound transducer emits pulse train signal and converts reflected acoustic signal

Method used

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  • Threshold generation for coded ultrasonic sensing
  • Threshold generation for coded ultrasonic sensing
  • Threshold generation for coded ultrasonic sensing

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Embodiment Construction

[0018] The reflected ultrasound signal can be detected by the ultrasound transducer and used to measure the round trip time, thus determining the distance to the object reflecting the ultrasound signal. For example, an automotive application may use one or more ultrasonic sensors to sense the distance of objects behind, beside, or in front of a car. The present application discloses systems and methods that provide enhanced ultrasonic detection of obstacles, especially when multiple ultrasonic transducers are operating simultaneously. Discrimination of echoes from ultrasonic signals produced by different transducers is improved by encoding the transmitted signal bursts and processing the received echoes with knowledge of this encoded information.

[0019] Allowing simultaneous operation of multiple transducers greatly improves the speed of the detection system, and thus also improves the responsiveness of the associated driver alert or autopilot control system. Encoding of si...

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Abstract

Embodiments of the present application relate to threshold value generation for coded ultrasonic sensing. In an ultrasonic detection system that uses frequency-modulation coding to distinguish emittedbursts from multiple transducers, a receiver (600) associated with a transducer uses dynamic thresholding to discriminate valid echoes (906) from system and environmental noise in multiple envelope signals produced by multiple correlators (608, 610). 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 (620) 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 withgreater time responsiveness.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 711,014, filed July 27, 2018, in the U.S. Patent and Trademark Office. Said provisional patent application is incorporated herein by reference. technical field [0003] The present invention relates to electronic processing systems and methods, and more particularly to threshold generation for encoded ultrasound sensing. Background technique [0004] Ultrasonic ranging is used in a variety of applications. For example, in automotive applications, ultrasonic transducers may be placed in the bumper or fender of the car. The transducer emits an ultrasonic signal that is reflected on nearby objects (if present) and senses the reflection. The round-trip time of the ultrasound signal is measured so that the distance to the object can be determined, or by processing reflection information from multiple transducers, the position of the object ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/08G01S7/526G01S7/524G01D5/42
CPCG01S15/08G01S7/526G01S7/524G01D5/42G01S15/104G01S7/536G01S15/325
Inventor 丁雷斯里纳特·马图尔·拉马斯瓦米瓦伊巴夫·加尔格阿南德·高普兰
Owner TEXAS INSTR INC
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