Non-recurrent wideband continuous active sonar

Hickman, Granger; Krolik, Jeffrey L.

doi:10.1109/oceans.2012.6405101

Cited by 23 publications

(24 citation statements)

References 4 publications

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“…Future work will focus on evaluating these CAS pulse train waveforms and ACPI processing in experimental trials. The data from these trials will allow for a comprehensive comparison of the GSFM pulse trains with those developed by [1].…”

Section: Discussionmentioning

confidence: 99%

“…Figure 4 (a) shows three seperate processing strategies that might be employed on CAS systems. The first approach, here referred to as Full-CPI (FCPI) processing, coherently processes all N pulses in the pulse train waveform and is essentially the approach proposed by Hickman and Krolik [1]. A bank of MF's tuned to different Doppler scaling factors are generated for each waveform and combined contiguously in time.…”

Section: A Processing Strategiesmentioning

confidence: 99%

“…20 seconds) Linear Frequency Modulated (LFM) waveforms with large swept bandwidth B (i.e. 500-1000 Hz) [1]. The resulting target echoes are then processed by a bank of P constant bandwidth bandpass filters that span the bandwidth of the transmit waveform.…”

Section: Introductionmentioning

confidence: 99%

“…Recent work by Hickman and Krolik [1] proposed using pulse trains of frequency-hopped Linear FM (LFM) waveforms to achieve large Instantaneous Bandwidth (IB), the bandwidth of an individual pulse, in addition to high TRRs. The frequency hopped LFM pulse train waveform is one example common in radar signal processing of coherently processing a train of diverse pulses to reduce range and/or Doppler ambiguities.…”

Section: Introductionmentioning

confidence: 99%

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The generalized sinusoidal frequency modulated waveform for continuous active sonar

Hague

Buck

2015

OCEANS 2015 - Genova

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Continous Active Sonar (CAS) system are bi-static systems that transmit high duty cycle waveforms so as to constantly process target echoes and revisit the target scene more frequently than conventional Pulsed Active Sonar (PAS) systems. This paper presents novel pulse train waveforms and adaptive processing methods for CAS systems. The pulse trains are composed of Generalized Sinusoidal Frequency Modulated (GSFM) waveforms that are nearly orthogonal to each other even when occupying the same band of frequencies. Additionally, three processing methods are introduced that trade off Coherent Processing Interval (CPI) with target acceleration tolerance while revisiting the target scene every Pulse Repetition Interval (PRI). Simulations demonstrate the pulse trains waveform designs and processing methods and show that certain pulse train designs also mitigate interference from the transmitted acoustic signal, known as the Direct Blast (DBL).

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Section: Discussionmentioning

confidence: 99%

Section: A Processing Strategiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The generalized sinusoidal frequency modulated waveform for continuous active sonar

Hague

Buck

2015

OCEANS 2015 - Genova

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“…Hickman and Krolik [3] note that if we are using a long slow LFM pulse and are forced by coherence considerations to only apply the detector using a small segment, then we are only using a fraction of the bandwidth and lose a substantial portion of the potential range resolution of the sonar. They propose a waveform which involves transmitting a series of FM chirps that are distinguished by different centre frequencies.…”

Section: Introductionmentioning

confidence: 99%

Frequency hopping waveforms for continuous active sonar

Lourey

2015

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Due to the relatively low speed of sound long range active sonar has a low update rate compared to radar systems. A possible solution to mitigate this problem is continuous active sonar. The source transmits sound continuously resulting in a continuous return echo. A problem is separating the transmission from the (weaker) returns from the target. This may be accomplished by transmitting very long linear frequency modulated (LFM) chirps so that the transmission and any target return are at different frequencies but this restricts the range resolution of the sonar system. In this paper, frequency hopping pulses are explored as an alternative approach to distinguish between the transmission and a target return.

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