摘要
采用信号自相关技术解线调,将超宽谱线性调频信号转化为窄带信号,然后量化为数字信号,做短时傅立叶变换识别信号,采用自适应滤波器组分离多信号。仿真证明,该方法可在-12dB的低信噪比情况下识别信号;在多信号下,能有效抑制交叉项的干扰;并且系统运算量较低,适合于实时处理。
Ultra-wide band linear frequency-modulated (UWBFM) signal is changed into narrowband signal by using signal autocorrelation to dechirping. UWBFM signal is sampled and quantized into digital signal and is recognized by short-time Fourier transform. The adaptive filter separates signal. Simulation result proved that this method can recognize signal at signal to noise ratio to -12dB.It can restrain the cross term effectively.And it can be real-time processing for little computational load.
