8.Carlson - Improving the Accuracy of Target Engagement...

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Presented by Lane Carlson1 M. Tillack1, T. Lorentz1, N. Alexander2, D. Goodin2, R. Petzoldt2 ( 1 UCSD,  2 General Atomics) HAPL Project Review Santa Fe, NM April 8-9, 2008 Improving the Accuracy of  Target Engagement
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Hit-on-the-fly experiment has demonstrated  improved  engagement on moving targets 1) Improvements in imaging and relaying the glint return signal to the  PSD give a more repeatable & dependable signal. 1) Improvements have yielded better engagement:  HAPL Oct 2007 - 150 µm (1 σ ) for targets in ± 1.5 mm range. 80 µm  (1 σ ) engagement for targets in ± 1.5 mm range. Final Requirement: 20 µm engagement accuracy in (x,y,z) at ~20 m (10 -6 )
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Surface issues have been resolved with glint  return imaging improvements Last time, concerned about surface roughness and laser beam profile. However, imaging system was looking at an intermediate, incoherent field. • With simplified setup, found proper focusing techniques that allow more precise  imaging of the glint’s true apparent source. Improper focusing Proper focusing Surface finish issues are  resolved with proper  focusing and aperture.
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Glint return provides a final reference point laser (1064 nm) sensor/PSD f 2m focusing mirror dichroic mirror aperture pellicle beam splitter
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Systematic identification and reduction of errors  yields improved target engagement Error sources as of Oct 2007: Relaying glint return.……. ..50 µm PSD accuracy limit………. .50 µm (spec) Target motion from  glint to driver……………. .24 µm (1 σ ) PSD non-linearity…………. .40 µm (1 σ ) Verification camera………~7 µm Mirror pointing…………. .…~6 µm Simplified setup helped identify four areas of improvement related to  relaying glint return: 1. Proper focusing of the glint return on the PSD.
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This note was uploaded on 09/21/2009 for the course CS 580 taught by Professor Fdfdf during the Spring '09 term at University of Toronto.

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8.Carlson - Improving the Accuracy of Target Engagement...

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