By Sergio Rui Silva
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Additional info for Advances in Sonar Technology (2009)
This scaled IFFT can be implemented by chirp multiplications in the time and frequency domain (Fig. 15). g. fit for interferometric imagery). Motion compensation can be applied to the acquired data in two levels: compensation of the known trajectory deviations and fine corrections trough reflectivity displacement, auto-focus or phase-retrieval techniques. The deviations from a supposed linear path are compensated thorough phase and range shift corrections in the echo data. Velocity variations can be regarded as sampling errors in the along-track direction, and compensated through resampling of the original data ([Fornaro, G.
Is approximated as ΔR g = ΔR s . cos θ g (4) Therefore, two objects on the seafloor are fully resolvable if their ground separation satisfies Δ Rg ≥ cτ . 2 cos θ g (5) Fig. 1. Sonar geometry; (left) One-sided SLS geometry, (right) Time domain representation of a transmitted pulse and corresponding echoes. Through equation (5) the range resolution is directly proportional to the ping duration τ and finer range resolution requires transmission of shorter pulses. However, in order to achieve very fine range resolution at long ranges, it may not be feasible to transmit very short pulses due to peak power limitation on the transmitter.
Autonomous boat based SAS model. Each echo contains indistinctive information of an area corresponding to the radiation pattern of the transducers. The transducers are adjusted so that a swath of about 50 m is at the boat left broadside, which is the strip-map configuration. At each along-track sampling position, the echoes caused by the swath reflectivity are received and recorded along the track. 1) Transducer beam pattern effects and signal propagation loss have not been included in the equation for simplicity but should be accounted for in the image reconstruction process.
Advances in Sonar Technology (2009) by Sergio Rui Silva