{
  "annotation_id": "578243d4-7e6e-4a1d-9db5-8d081040c0b3",
  "date_created": "2026-03-02T18:00:45.894000Z",
  "date_modified": "2026-03-02T18:00:45.894000Z",
  "file_hash": "a52373927bdb8e3c8a50d2b4d97818d0d85a487aadd98fd31517ee7f9bf83083",
  "private": false,
  "record": {
    "abstract": "Wigner-type distributions have shown their effectiveness in classification\nproblems of sonar and radar. We present an overview of applications where\nresonance features in echoes scattered from targets insonified or illuminated\nwith short pulses are studied in the joint time-frequency domain. We first show\nthe acoustic case of an elastic shell with a few filler materials submerged in\nwater and insonified by the \"clicks\" dolphins generate when they are\necho-locating the targets to classify them. The second example deals with a\nground-penetrating radar used to identify buried land mines. We have compared\nthe performance of various time-frequency distributions as well as a technique\nto combine these with a \"fuzzy-cluster\" representation of the subsurface target\nsignatures.",
    "arxiv_id": "physics/0309050",
    "authors": [
      "Guillermo C. Gaunaurd",
      "Hans C. Strifors"
    ],
    "categories": [
      "physics.comp-ph",
      "physics.gen-ph"
    ],
    "title": "Applications of (Wigner-Type) Time-Frequency Distributions to Sonar and   Radar Signal Analysis",
    "url": "https://arxiv.org/abs/physics/0309050"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "15ff4723-01de-48ff-9bf3-5ab9290266af",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}