Aspects of Signal Processing With Emphasis on Underwater by C. Giraudon (auth.), G. Tacconi (eds.)
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 lively sonar. we're proposing those effects on the complicated examine Institute that allows you to illustrate a few real purposes for such processing and to show a number of the functional issues which come up in actual platforms. specifically, the paper matters the issues which come up whilst the person sensor components have a sophisticated directivity development themselves. this can be a universal phenomenon in energetic platforms the place the receiving sensors are complicated resonant buildings and are housed in a dome or towed physique providing numerous baffling and diffraction results. so much remedies of array processing ponder perfect components that have good behaved directivity houses and are obvious to the sector. 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 sensible array profits is probably not pretty much as good as predictions in line with perfect sensors.
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Additional info 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
It is reasonable to conclude that the interference itself is precisely nulled but the processor cannot reduce the quantisation noise which the interference sets up during A/D conversion. The variation of the weight vector required to null the interference increases the white noise gain of the array. This explains the 1/(1-p2) term in the output power and shows that nulling an interference in the main beam of the conventional pattern causes the output of high quantisation power. An approximate estimate of the number of bits B of quantisation required can now be made.
An IF bandwidth of 960 Hz was employed. The receiver output signals generated by a stationary target at range rd consist of a constant-frequency sinusoid which may be set to a prescribed value fd through appropriate choice of the local oscillator waveform. An example is presented in Fig. 4. For the results reported in this paper, the receiver passband shown in this figure was between 0 and 980 Hz. ) the beat frequency falls outside of the receiver passband. The time waveform observed at the receiver output for this signal is shown in Fig.
No conditions have been found in which the use of adaptive processing induced a degradation in performance. Although the results presented are based on analysis of adaptive beamforming characteristics using a relatively small sample of field-recorded data, detailed studies which test these procedures over longer time periods and under a variety of ionospheric and interference conditions have been conducted at both the University of Colorado and Stanford Research Institute  using the WARF experimental facil ity.