{
  "date": "2026-09-20",
  "design": {
    "version": 2,
    "seed": 20260920,
    "status": "synthetic controlled benchmark",
    "dictionary_depths_m": [
      0,
      40,
      60,
      80,
      100,
      120,
      140,
      160,
      180,
      200,
      220,
      240,
      260
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    "evaluation_depths_m": [
      70,
      110,
      150,
      190,
      230
    ],
    "dictionary_speeds_m_s": [
      1800,
      2000,
      2200
    ],
    "dictionary_spacing_m": 5.0,
    "evaluation_spacing_m": 2.5,
    "reference_frequency_hz": 25.0,
    "radius_m": 20.0,
    "surface_amplitudes_um": [
      30.0,
      100.0,
      1000.0
    ],
    "amplitude_definition": "peak cavity-free SH displacement at the sampled receivers; shared force scaling, never target normalization",
    "receiver_snr_db": 20.0,
    "calibration_null_trials": 300,
    "test_null_trials": 100,
    "trials_per_depth": 20,
    "nominal_false_alarm_rate": 0.01,
    "depth_success_tolerance_m": 20.0,
    "receiver_indices": [
      0,
      3,
      7,
      10,
      13,
      17,
      20
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    "source": {
      "type": "Ricker body force",
      "x_m": -150.0,
      "z_m": 10.0,
      "start_s": -0.45
    },
    "assumptions": [
      "2D homogeneous SH wave equation; horizontal infinite cylindrical cavity, not vertical columns",
      "known active source timing and location; no intrinsic attenuation or heterogeneous geology",
      "seven known, separated coherent point reflectors; noiseless stationary-phase focusing",
      "independent 20 dB complex noise per reflector and aperture sample; no distributed clutter, atmosphere or autofocus",
      "phase readout assumes known range supports; it is an optimistic measurement, not the Biondi processor",
      "physical template inverse shares a wave-equation family with the forward model but uses a different mesh and disjoint depths",
      "noise trials measure conditional receiver uncertainty; they are not independent sites or geological realizations"
    ],
    "stress_cases": [
      "wrong wave speed",
      "wrong cavity radius",
      "wrong source position"
    ],
    "frequency_depth_matrix": {
      "frequencies_hz": [
        8.0,
        16.0,
        25.0
      ],
      "depths_m": [
        50.0,
        90.0,
        130.0
      ],
      "reason": "all test depths lie inside the fixed steering search interval"
    },
    "snr_extension": {
      "levels_db": [
        20.0,
        40.0,
        60.0
      ],
      "reference_amplitude_um": 1000.0,
      "reason": "Documented follow-up to low recovery in the initial 20 dB run; separate seeds and null calibration at each level. No formally preregistered field experiment is claimed."
    }
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  "acquisition": {
    "geometry": {
      "carrier_GHz": 9.65,
      "wavelength_m": 0.03106657595854922,
      "slant_range_km": 600.0,
      "incidence_deg": 35.0,
      "velocity_m_s": 7600.0,
      "pixel_az_m": 0.25,
      "pixel_rg_m": 0.25,
      "doppler_band_kHz": 24.32,
      "aperture_time_s": 3.9241990684483223,
      "aspect_span_deg": 2.847973898155937,
      "resolution_m": 0.276875
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      640
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    "ground_to_los_projection": 0.40557978767263886,
    "aperture_sample_count": 819
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  "versions": {
    "python": "3.11.3",
    "numpy": "2.4.6",
    "scipy": "1.17.1"
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    "note": "Noise trials use the algebraically identical separated-channel readout; the focused-SLC round trip is explicitly verified. Favorable known reflectors, not a demonstrated ground-scatterer extraction method."
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