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PreprintarXiv licencearXiv

3GPP-Compatible Long-Range Sensing for LEO-ISAC: A Window-Grid Processing Framework

  • Yi Geng
  • Xun Fan
  • Chenfeng Xu
  • Yu Zhao
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Abstract

This paper addresses long-range sensing in bistatic low-Earth-orbit integrated sensing and communication (LEO-ISAC). Conventional OFDM sensing fails in LEO-ISAC because millisecond-scale propagation delays destroy the transmitter--receiver symbol alignment and, with multiple targets, make the receive window longer than the transmitted block. We propose a window-grid (WG) processing framework that exploits the known beam-intersection swath to resolve both problems purely at the receiver, leaving the 3GPP symbol structure unmodified: the swath delay span is folded into cyclic-prefix-sized slices, each handled by one WG. With 103.2 MHz bandwidth at bistatic ranges beyond 640 km, simulations demonstrate meter-level ranging of two targets, and 1000 Monte-Carlo trials over random target--satellite geometries show that, with an ephemeris-based satellite-selection rule, every target is detected with a 90th-percentile range error of 2.4 m.

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Cite

BibTeXRIS
BibTeX
@misc{geng20263gppcompatible,
  title = {{3GPP-Compatible Long-Range Sensing for LEO-ISAC: A Window-Grid Processing Framework}},
  author = {Yi Geng and Xun Fan and Chenfeng Xu and Yu Zhao},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2609.30653},
  eprint = {2609.30653},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.30653},
}
RIS
TY  - UNPB
TI  - 3GPP-Compatible Long-Range Sensing for LEO-ISAC: A Window-Grid Processing Framework
AU  - Yi Geng
AU  - Xun Fan
AU  - Chenfeng Xu
AU  - Yu Zhao
PY  - 2026
DA  - 2026/10/28
PB  - arXiv
DO  - 10.48550/arxiv.2609.30653
UR  - https://arxiv.org/abs/2609.30653
AB  - This paper addresses long-range sensing in bistatic low-Earth-orbit integrated sensing and communication (LEO-ISAC). Conventional OFDM sensing fails in LEO-ISAC because millisecond-scale propagation delays destroy the transmitter--receiver symbol alignment and, with multiple targets, make the receive window longer than the transmitted block. We propose a window-grid (WG) processing framework that exploits the known beam-intersection swath to resolve both problems purely at the receiver, leaving the 3GPP symbol structure unmodified: the swath delay span is folded into cyclic-prefix-sized slices, each handled by one WG. With 103.2 MHz bandwidth at bistatic ranges beyond 640 km, simulations demonstrate meter-level ranging of two targets, and 1000 Monte-Carlo trials over random target--satellite geometries show that, with an ephemeris-based satellite-selection rule, every target is detected with a 90th-percentile range error of 2.4 m.
ER  -