Broadband target classification using a bionic sonar

A recently proposed echo-analysis technique based on a power-series expansion of the target transfer function and an optimally Doppler-tolerant transmitted waveform is discussed. Specific problems with the technique including sensitivity of the extracted parameters to time delay and Doppler changes in the received waveform are identified. An analysis is conduced of relatively low-frequency echoes from a number of simple submerged targets, and the results are reported. An iterative generalization of the proposed technique is introduced which substantially improves its performance.