发明名称 |
APPARATUS AND METHOD OF VELOCITY ESTIMATION |
摘要 |
A velocityx estimate is determined from a recevied signal by counting the number of times a signal in one multipath crosses a predetermined threshold in a given amount of time. A signal is received and a single multipath is extracted from the received signal. Instantaneous envelope values of the extracted multipath are calculated. A plurality of the instantaneous envelope valures are used to calculate a running RMS value. A level crossing threshold is determined using the running RMS value. The number of times the instantaneous envelope value crosses the level crossing threshold is counted. The number of level crossings is mapped to a velocity estimate. |
申请公布号 |
WO02061453(A2) |
申请公布日期 |
2002.08.08 |
申请号 |
WO2002US04991 |
申请日期 |
2002.01.31 |
申请人 |
QUALCOMM INCORPORATED |
发明人 |
WILBORN, THOMAS, BRIAN;PATEL, SHIMMAN;SIH, GILBERT, C.;ABRISHAMKAR, FARROKH |
分类号 |
G01S11/02;G01S19/25;G01S19/26 |
主分类号 |
G01S11/02 |
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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