发明名称 |
Positioning device and method capable of reducing the amount of operation |
摘要 |
A Positioning device includes a downconversion unit receiving positioning signals from satellites and converting the signals to an intermediate-frequency signal, and carrier search units using an output from the downconversion unit to search for a carrier wave of the received signals. The carrier search unit separates the received signal into in-phase and quadrate channel signals and spectrum-despreads them and then applies real Fast Fourier Transform to them. Of each frequency component, a signal corresponding to 0 Hz is corrected with a sum of all quadrate channel components to obtain a frequency difference between a local carrier and the carrier wave.
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申请公布号 |
US6392590(B1) |
申请公布日期 |
2002.05.21 |
申请号 |
US20000478529 |
申请日期 |
2000.01.06 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
KAGEMOTO TETSUYA |
分类号 |
G01S1/00;G01S19/29;G01S19/37;H04B1/707;H04B7/15;H04W64/00;(IPC1-7):H04B7/185 |
主分类号 |
G01S1/00 |
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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