KHz Single Photon Ranging: A Precise Tool to Retrieve Optical Response of Satellites Toshimichi Otsubo Hitotsubashi University 16th International Workshop.

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kHz Single Photon Ranging: A Precise Tool to Retrieve Optical Response of Satellites Toshimichi Otsubo Hitotsubashi University 16th International Workshop on Laser Ranging, Poznan, Oct, Philip Gibbs Graham M Appleby NERC Space Geodesy Facility

kHz & Single Photon ! kHz System: More shots, More returns (up to LAGEOS?) Sharp pulse width (10 ps at Hx) Single Photon System: No intensity dependence  Systematic bias minimised Large scatter, but the average profile of return pulse observable kHz + Single Photon System: Ideal tool for retrieving the satellite optical response Works like a streak-camera

Single Photon + 10 Hz Laser h UT Herstmonceux We had to accumulate a large number of passes to get the precise profile. Full-rate residual plot

Single Photon + kHz Laser h UT Herstmonceux We can do our job just by one pass (or less) !! Full-rate residual plot

Convolution Approach Otsubo and Appleby (2003, JGR) Convolution: System noise Satellite response function The result compared with Residual scatter System noise (=residual histogram of a small signature target) Satellite response func. (model simulation) Residual histogram of satellite returns. Compare Convolution

Deconvolution Approach, possible? This study (2008-, ongoing) The result can be compared with satellite response function System noise (=residual histogram of a small signature target) Satellite response func. (model simulation) Residual histogram of satellite returns. Compare ? = Deconvolution “G / F” w/ LPF  Time domain Freq domain: F Freq domain: G

Deconvolution Test [1] AJISAI ERS-2 residual histogram ~21h UT AJISAI residual histogram ~23h UT = X axis: residuals (one-way, m) Y axis: counts Special postprocess: Loose (10  ) rejection

Deconvolution Test [2] LAGEOS LAGEOS residual histogram ~1h UT = X axis: residuals (one-way, m) Y axis: counts ERS-2 residual histogram ~21h UT Special postprocess: Loose (10  ) rejection

Deconvolution Test [3] STELLA STELLA residual histogram ~2h UT = X axis: residuals (one-way, m) Y axis: counts ERS-2 residual histogram ~21h UT Special postprocess: Loose (10  ) rejection

4-D Simulation of CCR Response 4-Dimensional Function: Angle of incidence and azimuth (2-D) Velocity aberration (2-D) Software development at Hitotsubashi University for Single CCR Response (ongoing) Language: C# Input: CCR Shape, Optical Index, Coat, Size, Recession, Dihedral angle Laser wavelength, Polarisation Output: Far-field amplitude Grid size: 2-deg for angle of incidence, 2-  rad for velocity aberration > 2 GB in ASCII Text, > 100 MB in Binary (NetCDF) file Computation time: 6 to 14 hours per reflector … needs optimisation My talk in Session 13 gives more details

Optical Response Function (AJISAI) Model: Dihedral angle = 1.5”, Circular polarisation. Model: FWHM = 66 mm Obs: FWHM = 71 mm Deconvolved function

Optical Response Function (LAGEOS) Model: Dihedral angle = 1.25”, Circular polarisation. Model: FWHM = 10 mm Obs: FWHM = 13 mm Deconvolved function

Optical Response Function (STARLT.) Model: Dihedral angle = 1.5”, Circular polarisation. Coated reflector, round shape, 33 mm.. Model: FWHM = 7.0 mm Obs: FWHM = 9.6 mm Deconvolved function

Conclusions & Future works Nothing conclusive yet… kHz Single Photon data being obtained at Herstmonceux: Ideal to retrieve the satellite response function. NOT requires hundreds of passes. Testing a new data handling procedure - Deconvolution Targeting direct comparison between ‘observed response function’ and ‘modeled response function’. Sensitive to noise data. Sensitive to LPF settings. More tests required. HIT-U developing software for simulating 4D optical pattern This is also on-going development. Many thanks to Herstmonceux crews.