Aspects of Signal Processing With Emphasis on Underwater by C. Giraudon (auth.), G. Tacconi (eds.) PDF

By C. Giraudon (auth.), G. Tacconi (eds.)

This paper describes the result of present study at DREA during which thoughts of optimal array processing are being utilized to energetic sonar. we're providing those effects on the complicated research Institute to be able to illustrate a few real purposes for such processing and to indicate the various useful concerns which come up in actual platforms. specifically, the paper matters the issues which come up whilst the person sensor parts have a classy directivity trend themselves. it is a universal phenomenon in lively structures the place the receiving sensors are complicated resonant buildings and are housed in a dome or towed physique offering quite a few baffling and diffraction results. such a lot remedies of array processing think of excellent parts that have good behaved directivity homes and are obvious to the sphere. the result of this paper express that the place those houses should not met, cautious in situ array measurements are required, or even with such measurements functional array profits is probably not nearly as good as predictions in response to perfect sensors.

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Extra resources for Aspects of Signal Processing With Emphasis on Underwater Acoustics, Part 2: Proceedings of the NATO Advanced Study Institute held at Portovenere, La Spezia, Italy 30 August–11 September 1976

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The beat frequency falls outside of the receiver passband. The time waveform observed at the receiver output for this signal is shown in Fig. 5. Dashed I ines are used to indicate portions of the sweep in which the frequency is outside the passband of the receiver. For the parameters used in this study, 980 Hz receiver bandwidth and 8 1/3 kHz sweep range, the maximum allowable time period outside the passband is 1/(8 1/3) of the sweep period or about 2 mill iseconds. Inspection of Fig. 5 shows that the receiver output waveform for a stationary target consists of a sinusoid during each sweep With the phase of the sinusoid held constant with respect to the start time of the sweep.

In the research sonar the same transducer is used for both transmission and reception and is enclosed in a variable depth sonar (VDS) body. Under these conditions the stave response patterns are not smooth functions of angle but are similar to that in Figure 2, which displays the power response of a typical stave. Shown also in Figure 2 is a cardioid function used as an example of an idealized stave response. This is used later to compare the relative effects on beamforming of a smooth stave response and that obtained from calibration measurements of the transducer mounted in the VDS body.

This condition is produced when narrowband signals and filtering are employed to maximize the detectability of moving targets. When the sonar platform itself is moving the reverberation is doppler shifted as a function of angle with respect to the direction of motion. This effect combined with a frequency spread due to motion of the scatterers and the finite transmitted pulse length give the reverberation a directional characteristic when viewed through a particular doppler filter. The objective of optimum array processing here is to design a beam pattern which strongly discriminates in the directions of highest reverberation.

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