GeometrySGP4 → ECEF → ENU
SENSING SYSTEMS DIRECTORY
From moving radio links
to atmospheric state.
One entry point for Nephele's scientific model, computation chain, interactive cloud experiments, and full constellation twin.
Forward modelAmplitude · phase · Doppler
ReceiverRF → IQ → QPSK
Inverse modelRays → 3-D/4-D state
DIRECTORY
Choose a working surface
01
LIVE DIGITAL TWIN
Constellation & signal model
Select a satellite/ground pair, follow its catalog trajectory, and inspect link power, phase, Doppler, receiver state, weather, and array geometry.
Open surface 02
REFERENCE SHEET
Weather-sensing mathematics
The complete forward and inverse model: coordinates, complex RF propagation, multilayer clouds, Doppler, receiver decoding, tomography, calibration, and uncertainty.
Open surface 03
METHODS & SOLVERS
Computation pipeline
See how orbit samples become ray/voxel operators, how each observable is formed, and where ART, SIRT, MART, TV, advection, and posterior inference enter.
Open surface 04
INTERACTIVE LAB
Multilayer cloud RF lab
Change frequency, elevation, liquid water, thickness, temperature, wind, and rain. Separate each layer's modeled attenuation, excess path, phase, and residual Doppler.
Open surface MODELEDPublic orbit + weather inputs
Catalog states, forecast pressure levels, reference radios, and synthetic inverse observations.
MEASUREDCalibrated I/Q required
Precise orbit/clock, beam state, antenna response, raw pilots, and collocated weather truth.