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Current GBT Performance

Current GBT Performance. Focus Tracking. Empirical Model (gravity only): A + B cos(E) + C sin(E). Current model adequate up to K-band (20 GHz), but: No thermal compensation Some residual errors (which primarily affect pointing). Blind Pointing. Blind Pointing - residual errors.

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Current GBT Performance

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  1. Current GBT Performance

  2. Focus Tracking • Empirical Model (gravity only): • A + B cos(E) + C sin(E) Currentmodel adequate up to K-band (20 GHz), but: No thermal compensation Some residual errors (which primarily affect pointing)

  3. Blind Pointing

  4. Blind Pointing - residual errors

  5. Offset Pointing

  6. Half-power Tracking Elevation Cross-elevation

  7. Surface Accuracy Note: ~35% efficiency at 43 GHz  Effective rss error = 0.47 mm

  8. Surface Accuracy – side lobes 20GHz side lobes

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