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在直接序列扩频系统中应用频域捕获方法,可以显著缩短捕获时间,本文提出了在伪码寄存器全1状态后添0的办法,完美的解决伪码与FFT运算长度不匹配的问题。本文采用双重频率步进的扫频方法,有效地减少在低信噪比条件下的捕获时间。
In the direct sequence spread spectrum system, the application of frequency-domain capture method can significantly reduce the capture time. In this paper, we propose the method of adding 0 after the full-state of the pseudo-code register, so as to perfectly solve the problem that the length of the pseudo-code does not match the FFT operation. In this paper, a double frequency step sweep method is used to effectively reduce the capture time under low signal-to-noise ratio.