OrbitGeolocation | Orbital RF Emitter Geolocation & Spaceborne TDoA/FDoA

OrbitGeolocation triangulates terrestrial radio frequency emitters from space—combining Time Difference of Arrival (TDoA) and Frequency Difference of Arrival (FDoA) across satellite clusters to locate radar, emergency beacons, and illegal transmitters.

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)

Orbital RF Emitter Geolocation, Spaceborne TDoA/FDoA Triangulation & Spectrum Monitoring

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