| 摘要 |
The present invention is related to a receiver front-end circuit for a satellite navigation system comprising an input for a received signal, said received signal at least comprising a first satellite signal in a first satellite frequency band centred around a first frequency F1 and a second satellite signal in a second satellite frequency band centred around a second frequency F2, whereby the second satellite frequency band is adjacent to said first satellite frequency band. The receiver front-end circuit further comprises
- frequency shifting means for shifting the received signal such that the first frequency F1 is converted into a negative frequency and the second frequency F2 into a positive frequency and such that zero frequency falls between the converted first and second satellite frequency bands,
- first multiplication means for multiplying the frequency-shifted received signal with a first multiplication signal such that the multiplication means outputs the converted first satellite frequency band centred around zero frequency, and
- second multiplication means for multiplying the frequency-shifted received signal with a second multiplication signal derived from the first multiplication signal such that the multiplication means outputs the converted second satellite frequency band centred around zero frequency.
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