Transmit-Signal Design and Processing Strategies for Sonar Target Phase Measurement

Atkins, P.R.; Collins, Tim; Foote, Kenneth G.

doi:10.1109/jstsp.2007.897051

Cited by 46 publications

(26 citation statements)

References 21 publications

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“…The output of a Doppler-matched filter can be described as (6) where is assumed to be the received signal and is assumed to be the complex conjugate of the replica signal.…”

Section: Doppler Performancementioning

confidence: 99%

Phase feature extraction of echo for point target

Huang

Yan

2014

2014 12th International Conference on Signal Processing (ICSP)

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In order to correctly recognize underwater target in noise environment, a new method of feature extraction of target echo phase is proposed in the paper. Waveform design of difference frequency and processing of phase feature extraction are given, including sub-band correlation and frequency scaling shift. And the influence of Doppler frequency shift from moving target is theoretically discussed. The method is verified by using surface echo data from computer simulation and pool trial respectively, and results show that phase feature can be accurately obtained when SNR is greater than 5dB.

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“…The output of a Doppler-matched filter can be described as (6) where is assumed to be the received signal and is assumed to be the complex conjugate of the replica signal.…”

Section: Doppler Performancementioning

confidence: 99%

Phase feature extraction of echo for point target

Huang

Yan

2014

2014 12th International Conference on Signal Processing (ICSP)

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“…In automatic target identification for acoustical oceanography, this has been attempted by means of dualfrequency transmissions, where phase is determined as the angle difference of two frequencies [19], which also removes range dependencies. These operations can be carried out on the recorded spectra.…”

Section: B Differential Phase Measurementsmentioning

confidence: 99%

Broadband amplitude and phase sonar calibration using LFM pulses for high-resolution study of hard and soft acoustic targets

Islas-Cital

Atkins

Foo

et al. 2011

OCEANS 2011 IEEE - Spain

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Target phase has been advanced as an additional parameter for sonar target identification. Previous studies aiming to classify fish and other marine organisms by means of the phase angle component in their echoes have reported promising results. Similarly, the use of broadband techniques to simultaneously obtain spectral information and achieve good spatial resolution has been deemed advantageous. Therefore, broadband active sonar that utilizes both amplitude and phase would appear to be a desirable system. Adopting this approach requires suitable calibration methods that account for complex sensitivity over large bandwidths. Current calibration procedures that incorporate pulse compression with linear-frequency modulated (LFM) pulses are available but do not address phase. The present work expands on these methods in order to achieve broadband sonar amplitude and phase calibration, using spectral processing of LFM pulses and standard targets. Target phase is obtained as the difference of phase angles at two frequencies, in order to remove range effects. This paper presents time-domain scattering, together with calibrated target strength (TS) and phase spectra of solid tungsten carbide spheres and air-filled ceramic shells, obtained in a laboratory water tank. Experimental results are compared to theoretical models to validate measurements and identify underlying echo formation mechanisms.

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“…Chirp signals are widely used in radar [1], sonar [2], aerospace [3], ultrasound [4], communication [5] and many other areas. A mono-component chirp signal can be described as a signal whose frequency may increase or decrease linearly over time.…”

Section: Introductionmentioning

confidence: 99%

A fast and accurate chirp rate estimation algorithm based on the fractional Fourier transform

Serbes

Aldimashki

2017

2017 25th European Signal Processing Conference (EUSIPCO)

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Abstract-In this work, a fast and accurate chirp-rate estimation algorithm is presented. The algorithm is based on the fractional Fourier transform. It is shown that utilization of the golden section search algorithm to find the maximum magnitude of the fractional Fourier transform domains not only accelerates the process, but also increases the accuracy in a noisy environment. Simulation results validate the proposed algorithm and show that the accuracy of parameter estimation nearly achieves the Cramer-Rao lower bound for SNR values as low as −7dB.

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Transmit-Signal Design and Processing Strategies for Sonar Target Phase Measurement

Cited by 46 publications

References 21 publications

Phase feature extraction of echo for point target

Phase feature extraction of echo for point target

Broadband amplitude and phase sonar calibration using LFM pulses for high-resolution study of hard and soft acoustic targets

A fast and accurate chirp rate estimation algorithm based on the fractional Fourier transform

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