Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exploring the Interdependencies Between Transmit Waveform Ambiguity
  Function Shape and Off-Axis Bearing Estimation   The frequency dependent beampatterns of an active sonar projector filters the
acoustic signal that is transmitted into the medium, also known as the transmit
waveform. This filtering encodes information about the target's bearing
relative to the main response axis. For any given projector and transmit
waveform spectrum, there exists an optimal angle of operation which maximizes
the Fisher Information (FI) of the target bearing estimate. Previous
investigations into this phenomena show that for narrowband (i.e, high $Q$)
Linear Frequency Modulated (LFM) waveforms, the angle of maximum FI is solely
determined by its center frequency $f_c$. Steering the region of maximum
bearing estimation precision is then achieved by appropriate selection of the
LFM waveform's center frequency $f_c$. This fine bearing estimation is
accomplished without steering the projector's main response axis. In addition
to LFM waveforms, a wide variety of other active sonar waveform types exist
that possess distinct spectral characteristics. These other waveforms possess
different Ambiguity Function (AF) shapes from the LFM and are typically
utilized to suite the range-Doppler resolution requirements of the active sonar
system. This paper investigates the transmit waveform impact on off-axis
bearing estimation performance and the spectral filtering impact on the
waveform's AF shape. High $Q$ waveforms perform similarly to the LFM for
off-axis bearing estimation while the transducer's spectral filtering perturbs
the waveform's AF shape.

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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga