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 Doppler-shift and receiver frequency errors and for Doppler induced time errors in digitized samples used to estimate pseudorange information. |
申请公布号 |
WO0216961(A3) |
申请公布日期 |
2002.06.13 |
申请号 |
WO2001US41813 |
申请日期 |
2001.08.21 |
申请人 |
FAST LOCATION. NET, LLC;JANDRELL, LOUIS, H., M. |
发明人 |
JANDRELL, LOUIS, H., M. |
分类号 |
G01S19/25;G01S1/00 |
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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