发明名称 |
Pulse doppler measuring apparatus |
摘要 |
The present invention relates to a pulse Doppler measuring apparatus using the so-called acceleration method. In order to prevent production of a secondary aliasing (where a phase vector is subjected to an aliasing), the apparatus is provided with an MTI filter, which decomposes a first phase vector of a reflected wave obtained by mixing a reflection signal with a reference signal into a real part and an imaginary part, obtains a first regression line for variations of each of the parts and extracts a second phase vector corresponding only to the high frequency component of the reflected wave by calculating differences of the real part and the imaginary part from the first regression line; and/or an angular component DELTA theta of the phase difference vector is obtained; a second regression line is obtained for this phase difference angle DELTA theta ; and the phase difference angle DELTA theta is corrected by using this second regression line, to prevent the production of a secondary aliasing.
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申请公布号 |
US5109858(A) |
申请公布日期 |
1992.05.05 |
申请号 |
US19910650421 |
申请日期 |
1991.02.04 |
申请人 |
HITACHI, LTD. |
发明人 |
NISHIYAMA, HISASHI;HASHIMOTO, YASUHIRO;KANDA, HIROSHI;KATAKURA, KAGEYOSHI |
分类号 |
G01P5/00;A61B8/06;G01S15/52;G01S15/58 |
主分类号 |
G01P5/00 |
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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