26 August 2007 San Diego - SPIE 15 FF Specifications  Inter-Satellite Distance (ISD)  ~ 150 m (±2 m variation over the year)  Absolute Displacement Error (ADE)  Lateral positioning: ± 3.4mm (3  ) with 20 arcsec APE Can be relaxed to ± 6.0mm (3  ) at the expense of the APE (8 arcsec)  Longitudinal positioning: ±740mm (3  ) Inter-Satellite Distance (ISD) Absolute Displacement Error (ADE)
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