Abstract
Aiming at the acquisition problem of direct sequence spread-spectrum (DSSS) signals with large Doppler offset, a new method based on fast Fourier transform (FFT) is proposed. This method estimates Doppler frequency by eliminating PN code two-phase modulation effect, then gains code phase estimation by circular correlation. The parallel search of Doppler and code phase makes acquisition time hold a constant value. Computer simulations indicate that the acquisition time with this method is much shorter than others and it is independent of Doppler offset.
| Original language | English |
|---|---|
| Pages (from-to) | 1424-1426 |
| Number of pages | 3 |
| Journal | Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics |
| Volume | 30 |
| Issue number | 8 |
| Publication status | Published - Aug 2008 |
Keywords
- Acquisition
- Direct sequence spread-spectrum signals
- FFT
- Large Doppler offset
- Radar