{"artifact_id":"L1-106","layer":"L1","title":"Very Long Baseline Interferometry (VLBI)","domain":"Remote Sensing","sub_domain":"Radio-astronomy aperture synthesis","physics_fingerprint":{"L_DAG":4.5,"title":"Very Long Baseline Interferometry (VLBI)","domain":"Remote Sensing","carrier":"radio_wave","primitives":["L.radio_antenna_array","L.cross_correlation","L.fourier_synthesis","int.spatial"],"sub_domain":"Radio-astronomy aperture synthesis","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"2D_brightness_temperature","difficulty_delta":10,"integration_axis":"spatial","sensing_mechanism":"radio_interferometry"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D brightness temperature is guaranteed within the declared Omega bounds. Uniqueness holds on the measurement-supported subspace; out-of-support modes are controlled by the declared priors. Stability is moderately conditioned (kappa_eff ~= 30); ionospheric_delay dominates the stability cliff; atomic_clock_drift and the remaining mismatch parameters contribute higher-order bias terms. Additive gaussian thermal/electronic noise sets the irreducible data-fidelity floor, while TV / wavelet-sparsity / deep priors stabilise recovery at the ill-conditioned end of Omega.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"N_time":360,"SNR_dB":15.0,"lambda_cm":1.3,"N_antennas":10,"N_baselines":45,"ionospheric_delay":0.0,"atomic_clock_drift":0.0,"UV_coverage_fraction":0.1},"input_format":"measurement_only","problem_class":"vlbi_synthesis","forward_operator":"vlbi_synthesis_forward","epsilon_fn_center":"16.0"},"omega_bounds":{"RFI":[0.0,0.5],"N_time":[60,3600],"SNR_dB":[0.0,30.0],"lambda_cm":[0.01,500],"N_antennas":[4,100],"N_baselines":[6,4950],"ionospheric_delay":[0.0,1.0],"atomic_clock_drift":[0.0,0.01],"UV_coverage_fraction":[0.005,0.5],"station_position_error":[0.0,10.0]},"epsilon_bounds":{"psnr_db":[5.0,40.0]},"allowed_problem_classes":["vlbi_synthesis"],"allowed_omega_dimensions":["N_antennas","N_baselines","N_time","lambda_cm","UV_coverage_fraction","SNR_dB","ionospheric_delay","atomic_clock_drift","ionospheric_delay","atomic_clock_drift","station_position_error","RFI"],"allowed_forward_operators":["vlbi_synthesis_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":10,"kappa":600,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0xa51dd80c6821bfd1279298e61363c430f23166022cc2823dec91fd70e2a2144d","chain_tx_hash":"0x6a377ce2880888bdb45d08e790a9cf4b2a41387e4d06cdc2b37cb91f3ce65deb","chain_block":41554198}