一种多级窄带信号检测方法
A multi-stage detection method of narrowband signal

提出了一种组合应用双门限检测、频率跟踪和专家系统来对窄带信号进行多级检测的方法，并对影响窄带信号检测性能的因素进行了分析。该方法在不需事先知道窄带信号的强弱、数量、位置等信息的情况下，能以高检测概率和低虚警概率对低信噪比窄带信号进行自动检测。另外，由于该方法计算量较小，适合于实时处理，通过对海上实际目标数据的处理，验证了该方法具有良好的宽容性。
A multi-stage detection method of narrowband signal is given, which combines the double thresholds detection, frequency tracking, and expert system together. The factors that influence the detection performance of narrowband signals are analyzed. The analysis shows that this method can automatic detect narrowband signal with high detection probability and low false probability at low SNR without knowing their amplitude, position, and number of signals in advance. The proposed method is also robust in dealing with sea trial data and it is fit for real time processing because of small computation amount.