Keary, A., Hill, M., White, P. and Robinson, H.
Simulation of the correlation velocity log using a computer based acoustic model.
In, 11th International Symposium Unmanned Untethered Submersible Technology, Durham, USA,
The Correlation Velocity Log (CVL) can be used on both surface and underwater vessels to
measure the velocity relative to the seabed. The CVL has distinct advantages over rival
systems, such as inertial navigation and Doppler logs, at low speeds, making it especially
suitable for use on autonomous underwater vehicles (AUVs). The aim of this project is to
develop a new CVL which incorporates a number of innovative components that will lead to
a significant increase in the system accuracy. The project includes the development of a
software simulator and a hardware technology demonstrator.
This paper describes the simulation part of the project. A two level simulation strategy is
employed to investigate the detailed short time scale behaviour independently of the
performance over a longer time scale. The detailed model is used to improve the
understanding of the effect of variations in the physical environment and of transducer
characteristics. A second model is used to study the effect of random and systematic errors
over a long time scale and to test different operating and processing strategies. A fully
functioning prototype of the system is being developed in parallel with the simulator.
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