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匹配滤波器及相关器是在理想信道中白噪声背景下检测确知信号的最佳检测器，但由于水声信道的复杂性，这类理论上的最佳检测器在实际水声信道的应用中，性能产生严重蜕化。利用瞬时频率序列及其统计特征的估计结果，根据水声信道以及主动声呐工作环境的特点，提出了一种针对CW脉冲的回波信号的性能稳健的新型检测器一瞬时频率方差（VIF）检测器。根据理论分析、计算机仿真分析和实验验证，该检测器在非平稳的干扰背景和信道中具有很好的稳健性。对信号的起伏与衰落及多卜勒失配也有很好的适配性能。
Matched filters and correlators are the best detectors for detecting the exact signal in a perfect channel in the context of white noise. However, due to the complexity of underwater acoustic channels, the application of such theoretical best detectors to actual underwater acoustic channels In the performance of a serious degeneration. Based on the estimation results of instantaneous frequency sequence and its statistical features, a new detector with instantaneous frequency variance (VIF) detection based on the characteristics of underwater acoustic channel and active sonar is proposed. Device. According to theoretical analysis, computer simulation analysis and experimental verification, the detector has good robustness in non-stationary interference background and channel. There is also a good fit to the signal fluctuations and fading and Doppler mismatch.