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Costas frequency-hopped waveform is a class of pulse compression waveforms with thumbtack ambiguity function. It can provide higher precision on range and speed estimation for a target when used as a transmit waveform in an active sonar system. To improve active sonar performance, Costas-P4 hybrid waveform for active sonar based on Costas frequency modulation and P4 polyphase modulation is proposed...
Pulse trains of frequency modulated (PTFM) signals and continuous waveform (CW) pulses are all speed-sensitive signals that can be used as active transmitted signals. The target detection performance is closely related to the received reverberation strength. However, background environment is often complex and various, so it's difficult to describe practical reverberation through simulated data. Statistical...
The performance of detecting weak targets is not fine for active sonar by using the cascaded time-space adaptive method. Based on which, this paper presents a modificed cascaded time-space adaptive method. The new method enhances the performance of active sonar detecting weak targets greatly by means of ODN narrow notch filter that is carrid out by the technology of reverberation primary component...
The influence of transmitted waveforms on the signal-to-reverberation ratio (SRR) of a low-frequency active sonar is analyzed both theoretically and experimentally. Reverberation experiments have been conducted during a sea trial in a littoral water environment in October 1999. The aim of the trials was to compare the performance of three classes of waveforms: standard hyperbolic frequency-modulated...
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