{
 "manifest": {
  "id": "p2_03_what_a_dwell_sees",
  "title": "What one dwell can see of the ground's motion",
  "date": "2026-09-28",
  "started_utc": "2026-09-28T05:09:11+00:00",
  "runtime_s": 53.9,
  "commit": "d9e33c2",
  "params": {
   "geometry": "giza-20250827",
   "look_s": 1.96,
   "looks": 16,
   "image_px": [
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    128
   ],
   "motion": {
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    "v_m_s": 0.002,
    "block_half_m": 10.0
   },
   "bright_amplitude": 300.0,
   "lowpass_hz": [
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    1.0,
    2.0,
    3.0
   ],
   "real_crop": "desert_west (legacy R1/R9 patch)"
  },
  "environment": {
   "python": "3.11.3",
   "numpy": "2.4.6",
   "numba": "0.67.0",
   "threads": 16,
   "cpus": 16
  }
 },
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    "recovered_gain": -0.014302096551534877,
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  ],
  "r7_frequencies_hz": [
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   3.0
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  "r7_gains": [
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 },
 "real": {
  "crop_origin": [
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  "crop_shape": [
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  "coherence": {
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  "identity_max_error": 1.224e-09,
  "block": {
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   "complex": [
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   "gain_complex": 0.013456,
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   "gain_envelope_se": 0.066778,
   "gain_paired": 1.01233,
   "floor_complex_um_s": 15.023648,
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  },
  "origin": "computed from the product in this run"
 },
 "finding": "One dwell is nearly blind to ordinary ground moving. Registering its looks against each other, as every single-image method does, recovers 3 ± 1% of a 20 m stretch of ground's motion by complex correlation and 10 ± 2% by magnitudes, on simulated desert on the real geometry, and 1 ± 1% and 21 ± 7% on the real Giza image, though the motion is in the data (102% and 101% read against a motionless twin, which no real dwell has). Looks cut from one image share their spectrum sample for sample, so their correlation locks at zero, and motion common to a patch of speckle leaves the image's statistics unchanged; magnitudes catch only what is point-like in the ground. A lone bright point's envelope follows its motion in full (100 ± 2%). The first investigation's coherence curve is this identity: simulated desert with no decorrelation reproduces it, and the real crop's power spectrum reproduces its own coherence to 1e-09. A look also averages motion over its 1.96 s and passes little above 0.3 Hz: a bright point swaying at R7's 1, 2 and 3 Hz comes back at 10, 4, 1% of its speed."
}