发明名称 |
Distance measurement apparatus |
摘要 |
A forward electromagnetic wave is generated in accordance with a succession of pseudo random noise code signals. An echo electromagnetic wave caused by reflection of the forward electromagnetic wave at an object is converted into a received signal. Direct-current and low-frequency components are removed from the received signal to generate a filtering-resultant signal. The filtering-resultant signal is compared with a preset decision reference voltage to generate a binary signal. The binary signal is sampled into received data. Calculation is made as to a correlation between the received data and the pseudo random noise code signal. The distance to the object is computed on the basis of the calculated correlation. The pseudo random noise code signal is repetitively generated to produce a succession of the pseudo random noise code signals during a surplus time covering a stabilization time taken by the received signal to stabilize in direct-current voltage level.
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申请公布号 |
US2002186362(A1) |
申请公布日期 |
2002.12.12 |
申请号 |
US20020157230 |
申请日期 |
2002.05.30 |
申请人 |
SHIRAI NORIAKI;MORIKAWA KATSUHIRO |
发明人 |
SHIRAI NORIAKI;MORIKAWA KATSUHIRO |
分类号 |
H04J13/00;G01S7/493;G01S13/28;G01S17/36;(IPC1-7):G01C3/08 |
主分类号 |
H04J13/00 |
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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