https://forum.vectorworks.net/index.php?/profile/15371-designature/content/&type=cms_records_comment1&change_section=1
DeSignature's Content - Vectorworks Community Board
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https://www.tgs.com/technical-library/directional-designature-without-near-field-hydrophone-recordings
Directional designature without near-field hydrophone recordings
Near-field recordings are used for directional designature to address variations of source signatures with regards to take-off angle and azimuth.
near fielddirectionaldesignaturewithouthydrophone