Error analysis of correlation logs

The majority of navigation sensors which rely on external references only provide an optimum performance when the sensor is stationary. Any movements of the sensor are likely to degrade the performance of the system. Using the analysis of the varying geometries it is shown that the basic correlation log is vulnerable to errors induced by motions such as pitch, and yaw. However, the accuracy appears not to be affected by vertical motions such as surge and heave, or by a sloping sea-bed. The accuracy could be significantly improved by incorporating results from sensors such as attitude and heading reference systems into the velocity estimation process