A method of velocity estimation using composite hyperbolic frequency-modulated signals in active sonar

Fangyong Wang; Shuanping Du; Wei Sun; Qiang Huang; Jiao Su

doi:10.1121/1.4982724

A method of velocity estimation using composite hyperbolic frequency-modulated signals in active sonar

J Acoust Soc Am. 2017 May;141(5):3117. doi: 10.1121/1.4982724.

Authors

Fangyong Wang¹, Shuanping Du¹, Wei Sun¹, Qiang Huang¹, Jiao Su¹

Affiliation

¹ Science and Technology on Sonar Laboratory, Hangzhou Applied Acoustics Research Institute, Number 715 Pingfeng Road, Hangzhou, 310023, China.

PMID: 28599527
DOI: 10.1121/1.4982724

Abstract

This paper proposes a method to estimate the target velocity using a combination of two hyperbolic frequency-modulated (HFM) signals. The Doppler-shifted time-delay between the two signals compared with the original time-delay is used to estimate the target velocity. One finds that a HFM with an increasing frequency sweep (positive HFM) and one with a decreasing frequency sweep (negative HFM) yield a different time. And a better Doppler estimation can be obtained by using a negative HFM signal followed by a positive HFM signal than the other way around. The method is applied to real data and performance is demonstrated via simulated data.