Common Secondary vs sub telescope Common Secondary Mirror Array Phased Sub Telescope Array Beam D Combine Common primal Sub Telescope Fizea Precise Off Axis Configuration Need Combiner Phase sensing and Off Axis Optical Aberration compensater mechanism (complex Less central Obstruction(off Axis) On Axis suffers central obstruction Hard to change the configuration Can employ Off-the-shelf telescopes Air Force is studying two options for UltraLITE(Golay 6) Chart: 7 16.684 Space Systems Product Development February 13, 2001 MIT Space Systems Laboratory16.684 Space Systems Product Development Chart: 7 February 13, 2001 MIT Space Systems Laboratory CCD Beam Combiner Common Secondary vs Sub Telescope Phased Sub￾Telescope Arrays Common Primary Sub Telescope Fizeau Precise Off Axis Configuration Off Axis Optical Aberration Need Combiner + Phase sensing and compensater mechanism (complex) Less Central Obstruction(Off Axis) On Axis Suffers Central Obstruction Hard to change the Configuration Can employ Off-the-shelf telescopes Common Secondary Mirror Array AirForce is studying two options for UltraLITE(Golay 6)