LEOGeolocation | 低軌道（LEO）測位および高精度ドップラー測距システム

LEOGeolocationはLEOメガコンステレーションを用いた高精度測位を提供し、急峻なドップラーシフト曲線とオポチュニスティック信号を活用して耐妨害測位を実現します。

LEOGeolocation Rapid Doppler Curve Fitting Pipeline

Instantaneous user position triangulation derived from LEO orbital pass geometry

Central System: Low Earth Orbit Constellation - 550 km altitude, 7.5 km/s orbital velocity

Network Nodes

Low Earth Orbit Constellation
Direct RF SDR Front-End
Non-Linear Doppler Curve Solver
Authenticated 3D Coordinate

Architectural Protocol Layers

Spaceborne PHY/MAC Layer (3GPP Rel-17 TS 38.300): Doppler compensation, HARQ disabling, and timing advance extension.
Orbital Mesh Routing (CCSDS / Delay-Tolerant Networking): Dynamic topology routing over intermittent laser crosslinks.
Regenerative Core Processing (OpenRAN / 3GPP CU-DU Split): Onboard user plane function (UPF) local breakout.

Key Metrics: < 18ms (LEO Orbit-to-Ground Roundtrip) | 100 Gbps (Optical Crosslink Throughput) | ±48 kHz (Doppler Shift Compensation) | 99.999% (Orbital Constellation Availability)

低軌道（LEO）ジオロケーション、高精度ドップラー測距およびメガコンステレーションPNT

Core Engineering Areas

Doppler Rate-of-Change Solver (df/dt) — Exploiting high LEO angular velocities where frequency shift rates exceed 40 Hz/s, creating sharp mathematical position intersection curves.
Signals of Opportunity (SOP) Tracking — Deriving sub-meter positioning from commercial broadband satellite downlinks without requiring dedicated navigation payloads.
Tropospheric Delay Compensation — Real-time atmospheric modeling compensating for slant path wet and dry delay variations as satellites sweep from horizon to horizon.

Technical Articles

Related Cluster Architecture Specifications

NonTerrestrialNetwork — 3GPP 5G/6G NTN Satellite Architecture, Direct-to-Cell & Non-Terrestrial Infrastructure
NonTerrestrialNetworks — Multi-Orbit Heterogeneous Constellation Interworking (LEO / MEO / GEO / HAPS)
AirspaceSync — Doppler Compensation, Relativistic Timing & Airspace-Space Synchronization
FSOComm — Free Space Optics, High-Bandwidth Space Laser Communications & Atmospheric Mitigation