发明名称 |
Method and apparatus for rapidly estimating the doppler-error and other receiver frequency errors of global positioning system satellite signals weakened by obstructions in the signal path |
摘要 |
Frequency-offset components are extracted from a set of digitized samples of signals transmitted by a satellite. The samples are squared to produce squared samples and decimated. The squared samples are auto-correlated to produce an auto-correlate, and the auto-correlate is truncated. The truncated auto-correlate is transformed into the frequency domain to obtain double-frequency offset components. The scaled offset frequencies are used to compensate for Döppler-shift and receiver frequency errors and for Döppler induced time errors in digitized samples used to estimate pseudorange information.
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申请公布号 |
US2002111739(A1) |
申请公布日期 |
2002.08.15 |
申请号 |
US20010989906 |
申请日期 |
2001.11.19 |
申请人 |
FAST LOCATION. NET, LLC, A TEXAS CORPORATION |
发明人 |
JANDRELL LOUIS H.M. |
分类号 |
G01S19/25;G01S1/00;(IPC1-7):G01C21/28 |
主分类号 |
G01S19/25 |
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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