Simple algorithms for sonar imaging and bathymetry with a linear swept-frequency (chirp) source
✍ Scribed by Geoffrey Shippey
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 378 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0899-9457
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✦ Synopsis
This article describes a digital implementation of timealgorithm provides an all-electronic area or volume imaging techdelay sonar imaging for linear swept-frequency (chirp) sources. The nique. Side-looking sonar is the principal tool for acoustic seabed technique, based on phase-shifting of match-filtered individual transsurvey, since scanning in the azimuth direction is carried out ducer echoes, is a direct equivalent of analog phased-array proautomatically by movement of the sonar platform through the cessing. Computing and sampling costs are minimized by sparse
water. Here the advantages are less obvious, but area imaging population of the receiver aperture, using a separate transmission reduces constraints on survey speed and also opens up the possiarray with controlled beamwidth to suppress grating lobes. Syntheticbility of azimuth resolution enhancement using synthetic-aperture aperture processing uses essentially the same computation, and is sonar (SAS). The concept of Synthetic-Aperture Sonar is based carried out for a chirp signal without frequency decomposition. When directly on synthetic-aperture radar (SAR). The basic algorithms different arrays are used for transmission and reception, azimuthal resolution depends on transmission array length, but maximum moveextend to synthetic aperture processing without significant modiment between pings without aliasing is set by the length of the receiver fication.
array, so high resolution is compatible with fast survey. This article Most commercial sonars employ narrowband pulses analogous describes how a closely related algorithm can be used for swath to the typical radar pulse. However, wideband acoustic equipment bathymetric depth estimation, and presents simulation results using is becoming increasingly important for scientific and research a random surface scatterer model.