Narrowbandsignal is an important and familiar signal in practice.
在实际应用中，窄带信号是一种重要且常见的信号。
2
Moreover, we improve the method. In the interest of reducing computation, FFT pruning is combined in the new method based on the characteristic of narrowbandsignal.
此外还对这个算法进行了改进，针对窄带信号的特点，将裁减FFT的方法引入其中，以减少计算量。
3
In the highly crowded HF band, available continuous bandwidth is very narrow, this threaten the viability of HF radar based on the continuous spectra signal system seriously.