OrbitGeolocation | 天基卫星轨道射频辐射源超精无源定位与 TDoA/FDoA 联合探测

OrbitGeolocation 从太空对地面射频辐射源进行高精定位，结合多星集群到达时间差 (TDoA) 与到达频率差 (FDoA)，精准锁定雷达、搜救信标与非法干扰源。

OrbitGeolocation Satellite Cluster TDoA/FDoA Pipeline

Coordinated multi-satellite cross-ambiguity function (CAF) signal processing

Central System: Terrestrial RF Emitter - Marine radar, AIS, or rogue frequency jammer

Network Nodes

Terrestrial RF Emitter
Tri-Satellite Formation Flying Cluster
Cross-Ambiguity Function (CAF) Engine
Pinpoint Surface Geolocation

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)

在轨射频辐射源地理定位、星载时差/频差 (TDoA/FDoA) 交叉定位与空间频谱监测

Core Engineering Areas

Joint TDoA and FDoA Isochrone Intersection — Intersecting hyperbolic time delay curves (isochrones) with Doppler shift difference curves (isodops) to yield unambiguous ground coordinates.
Cross-Ambiguity Function (CAF) Acceleration — FPGA-accelerated 2D Fast Fourier Transform correlators extracting sub-nanosecond signal delays from low signal-to-noise ratio emitters.
Inter-Satellite Sub-Nanosecond Clock Synchronization — Using bidirectional optical laser crosslinks to synchronize rubidium and chip-scale atomic clocks across cluster satellites.

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