发明名称 |
Alias sampling for IF-to-baseband conversion in a GPS receiver |
摘要 |
The present invention provides a GPS receiver comprising sampling circuitry adapted to perform IF-to-baseband conversion. In general, the GPS receiver includes downconversion circuitry that uses a first synthesizer output signal to reduce an amplified GPS input signal to an intermediate frequency signal, and sampling circuitry that receives the intermediate frequency signal and produces a baseband digital representation of the amplified GPS input signal. The sampling circuitry performs IF-to-baseband conversion by using a sampling rate equal to the frequency of a second synthesizer output signal, where the sampling rate is selected such that only an alias of the IF signal having the appropriate baseband frequency is digitized.
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申请公布号 |
US2004042563(A1) |
申请公布日期 |
2004.03.04 |
申请号 |
US20020232650 |
申请日期 |
2002.08.30 |
申请人 |
NAJARIAN RICHARD;KEEGAN RICHARD |
发明人 |
NAJARIAN RICHARD;KEEGAN RICHARD |
分类号 |
G01S1/00;H03K9/00;H04L27/14;(IPC1-7):H03K9/00 |
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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