Line Spectrum Detection Technology Based on Long-Term Coherent Accumulation

The long-time coherent accumulation algorithm is commonly employed in passive sonar for enhancing signal-to-noise ratio in line spectrum detection. When there is relative motion between the target and the receiver, doppler frequency shift broadens the received line spectrum signal. In this study, the received signal is simulated using the bellhop procedure, ensuring channel coherence. Through the long-time coherent accumulation algorithm and dynamic doppler shift compensation, high-gain line spectrum detection of moving targets is achieved.