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For bistatic sonar, the weak signal of target is often buried by the side lobes of strong direct blast after pulse compression. A method is proposed in this paper to suppress the side lobes of matched filter output. The basic idea is to design an FIR filter at the output of matched filter, so that to minimize the ISL (Integrated Side lobe Level), while keeping the main lobe unchanged. The optimal...
The bistatic sonar can't detect the target nearby the baseline because of the effect of direct wave. The forward target strength is 15 dB above the other direction according to the Babinet's principle. This phenomenon could be utilized for target detection. The three key points including forward target strength, sonar coverage and system response time are discussed. The derivation of the forward target...
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