| 摘要 |
<p>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 (1) 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 (2) 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 (3) 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.</p> |
