{
  "annotation_id": "0f3c79b7-7aa3-4ea2-8a2b-8531ec2e6c7b",
  "date_created": "2026-03-02T18:00:53.564000Z",
  "date_modified": "2026-03-02T18:00:53.564000Z",
  "file_hash": "753e0fc4ff2e79e6cf0f5747283f2659aa40f781a93d9423d751b310927e2098",
  "private": false,
  "record": {
    "abstract": "Radio occultation events recorded on 28-29 July 2004 by a GPS receiver aboard\nthe GRACE-B satellite are analyzed. The stability of the receiver clock allows\nfor the derivation of excess phase profiles using a zero difference technique,\nrendering the calibration procedure with concurrent observations of a reference\nGPS satellite obsolete. 101 refractivity profiles obtained by zero differencing\nand 96 profiles calculated with an improved single difference method are\ncompared with co-located ECMWF meteorological analyses. Good agreement is found\nat altitudes between 5 and 30 km with an average fractional refractivity\ndeviation below 1% and a standard deviation of 2-3%. Results from end-to-end\nsimulations are consistent with these observations.",
    "arxiv_id": "physics/0409032",
    "authors": [
      "G. Beyerle",
      "T. Schmidt",
      "G. Michalak",
      "S. Heise",
      "J. Wickert",
      "Ch. Reigber"
    ],
    "categories": [
      "physics.geo-ph"
    ],
    "doi": "10.1029/2005GL023109",
    "title": "GPS radio occultation with GRACE: Atmospheric profiling utilizing the   zero difference technique",
    "url": "https://arxiv.org/abs/physics/0409032"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "79e42990-8685-454f-80fc-f7e517a9243c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}