Repeat-sequence coding for improved precision of Doppler sonar and sodar

Abstract

Repeat-sequence coding is a robust method for improving the precision of velocity estimates from incoherent Doppler sounders. A model is developed here to predict performance enhancement for specified codes. The model is based on the sample error of the covariance estimates. Coded pulse technology has been implemented on a variety of Doppler sonar systems at Scripps Institution of Oceanography and used in both open-ocean (volume-scattering) and shallow-water (surface-scattering) applications. Field measuresments of sonar precision roughly agree with predictions of the model, although with some increase in error. -from Authors