{
  "annotation_id": "45a1af30-a579-4ab6-8c14-f007626e4108",
  "date_created": "2026-03-02T18:00:50.269000Z",
  "date_modified": "2026-03-02T18:00:50.269000Z",
  "file_hash": "bbb7f2218900f89bc6b61dc99ff7357de8b051125ea6402a6b1c543151daf70c",
  "private": false,
  "record": {
    "abstract": "Results from a GPS reflectometry experiment with a 12 channel ground-based\nGPS receiver above two lakes in the Bavarian Alps are presented. The receiver\nmeasures in open-loop mode the coarse/aquisition code correlation function of\nthe direct and the reflected signal of one GPS satellite simultaneously. The\ninterference between the coherently reflected signal and a model signal, which\nis phase-locked to the direct signal, causes variations in the amplitude of the\nin-phase and quad-phase components of the correlation sums. From these\namplitude variations the relative altimetric height is determined within a\nprecision of 2 cm.",
    "arxiv_id": "physics/0407091",
    "authors": [
      "Achim Helm",
      "Georg Beyerle",
      "Markus Nitschke"
    ],
    "categories": [
      "physics.ao-ph",
      "physics.geo-ph"
    ],
    "title": "Detection of coherent reflections with GPS bipath interferometry",
    "url": "https://arxiv.org/abs/physics/0407091"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "cfdd2e38-10fa-4984-9de9-2ba3357d1ec2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}