基于频率着色的被动声呐宽带能量检测方法

To improve the target resolution and detection ability of conventional broadband energy detection (CED) of a passive sonar, we propose a new wideband energy detection method on the basis of frequency coloring. The tricolors, namely, red, green, and blue are used in passive sonar broadband energy detection, and the beam output of the processed broadband signal is mapped into different tricolor values according to frequency to obtain a color beam output matrix. The color beam output matrix is mixed on the basis of the principle of the three primary color additive method to obtain broadband color output. The colorful bearing time record can be obtained by showing the wideband outputs in chronological order. The proposed method not only retains the gain of the integration processing but also highlights the frequency difference between the target and interference and the difference between the target and background to improve display performance. Numerical simulation and measured data show that compared with CED, the proposed method can obtain a higher multi-target bearing resolution and a better weak target detection ability.