发明名称 |
Ultrasonic ranging system and method for improving accuracy thereof |
摘要 |
An ultrasonic ranging system and method for detecting the presence of and distance to a target using ultrasonic sound waves generated by an ultrasonic transducer with reduced audible noise. Electrical ultrasonic signal pulses are modulated according to a smooth modulation envelope and a transducer drive signal is generated from the modulated signal pulses. The transducer drive signal drives an ultrasonic transducer which generates ultrasonic sound waves for transmission in a desired path, and further receives ultrasonic sound waves reflected from targets in the transmission path. The received ultrasonic sound waves are converted to an electrical signal that is processed by a processor to provide time and distance information to the target. The distance information is computed by using a middle time value for the transmitted and received signals.
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申请公布号 |
US6202034(B1) |
申请公布日期 |
2001.03.13 |
申请号 |
US19990237851 |
申请日期 |
1999.01.27 |
申请人 |
DELPHI TECHNOLOGIES, INC. |
发明人 |
LI SONGNIAN |
分类号 |
G01S7/527;G01S15/10;(IPC1-7):G01S15/00 |
主分类号 |
G01S7/527 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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