Paper

{
  "raw_xml": "<entry>\n    <id>http://arxiv.org/abs/2603.04813v1</id>\n    <title>Detection of GNSS Interference Using Reflected Signal Ob-servations from the LEO Satellite Constellation</title>\n    <updated>2026-03-05T04:58:48Z</updated>\n    <link href='https://arxiv.org/abs/2603.04813v1' rel='alternate' type='text/html'/>\n    <link href='https://arxiv.org/pdf/2603.04813v1' rel='related' title='pdf' type='application/pdf'/>\n    <summary>Radio Frequency Interference (RFI) is a growing concern for Global Navigation Satellite System (GNSS) reliability. The Cyclone GNSS (CYGNSS) constellation, designed for ocean wind retrieval via GNSS reflectometry (GNSS-R), provides Delay-Doppler Maps (DDMs) with noise floor metrics exploitable for spaceborne RFI detection. This study proposes a maximum-based DDM noise floor strategy that selects the highest noise floor value among four simultaneous GNSS reflections at each 0.5-second epoch, rather than their mean, preventing dilution of anomalous signals by unaffected channels. To suppress false alarms, a two-tier verification framework is introduced: (1) multi-satellite concurrent detection, confirming RFI when two or more CYGNSS satellites independently flag the same geographic region, and (2) temporal persistence verification, confirming a single-satellite detection only if threshold exceedance persists over a 10-second window. The physical basis for this criterion is established through slant-range geometry analysis between a ground-based jammer and the orbiting satellite. Performance is evaluated using CYGNSS Level 1 data from May 2025 in two regions: White Sands Missile Range, where NOTAM-announced GPS jamming tests were conducted, and the Middle East, where persistent RFI has been documented. The proposed method is compared against NASA's kurtosis-based RFI flags and a mean-based noise floor method. Results show that it detected RFI on three dates where the other methods produced negligible detections, and flagged 62% of total epochs in the Middle East compared to 46% (mean-based) and 33% (kurtosis-based). It also demonstrated capability to detect the early onset of gradually intensifying interference and atypical abnormal patterns not previously reported, highlighting the potential of maximum-based DDM noise floor analysis for sensitive and reliable spaceborne RFI detection.</summary>\n    <category scheme='http://arxiv.org/schemas/atom' term='eess.SP'/>\n    <published>2026-03-05T04:58:48Z</published>\n    <arxiv:primary_category term='eess.SP'/>\n    <author>\n      <name>Ji-Hyeon Shin</name>\n    </author>\n    <author>\n      <name>Pyo-Woong Son</name>\n    </author>\n  </entry>"
}