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The Matera Laser Ranging Observatory

The Matera Laser Ranging Observatory. Giuseppe Bianco Centro di Geodesia Spaziale, ASI – Matera, Italy. FSP-06, Frascati, Italy, 21-23 March 2006. SLR concept. LAGEOS. Stella. GFZ-1. Ajisai. Starlette. LAGEOS-I. LAGEOS-II. Etalon-I & -II. Inclination Perigee (km) diameter (cm)

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The Matera Laser Ranging Observatory

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  1. The Matera Laser Ranging Observatory Giuseppe Bianco Centro di Geodesia Spaziale, ASI – Matera, Italy FSP-06, Frascati, Italy, 21-23 March 2006

  2. SLR concept

  3. LAGEOS

  4. Stella GFZ-1 Ajisai Starlette LAGEOS-I LAGEOS-II Etalon-I & -II Inclination Perigee (km) diameter (cm) mass (kg) 64.8° 19,120 129.4 1415 109.8° 5,860 60 411 52.6° 5,620 60 405.4 50° 1,490 215 685 50° 810 24 47.3 98.6° 800 24 47.3 51.6° 396 20 20.6 Geodetic satellites

  5. Lunar targets

  6. Lunar reflectors

  7. Centro di Geodesia SpazialeGiuseppe ColomboMatera, Italy

  8. MLRO specifications • Astronomical quality telescope, 1” pointing accuracy, 1.5 m aperture • Day & night, 1- and 2-color ranging capability to satellites from 400 km orbit to the Moon • Single-shot RMS jitter •  5 mm on LAGEOS ( 1 mm NP) •  5 mm on Starlette, ERS ( 1 mm NP) •  15 mm on Etalon, Glonass ( 3 mm NP) •  15 mm on Moon ( 10 mm NP)

  9. TX-RX table

  10. Lageos 2 pass on 98/10/15 pass length = 46 min. number of obs. = 21945 return rate = 80% rms= 5.08 mm skewness = 0.17 kurtosis = -0.13 700 600 500 400 300 200 100 0 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 LAGEOS II observations from MLRO Number of observations Residuals (cm)

  11. Ajisai residual analysis

  12. LAGEOS I residual analysis

  13. Shot-by-shot residuals (mm) Lageos 2 pass on 29/05/2000 number of obs. = 14481 mean = 0.00 mm rms= 5.67 mm Time (sec) from the pass start LAGEOS II MLRO observations

  14. LAGEOS II residual analysis(October 15, 1998)

  15. LAGEOS II residual analysis(May 29, 2000)

  16. 60 55 50 45 40 35 30 25 20 15 10 1998.5 1999 1999.5 2000 2000.5 2001 2001.5 2002 2002.5 Observed LAGEOS-2 down-spinning rate (exponential fit) post-fit RMS 88.5 ms Down-spinning rate: factor of 2 every 1.5 years factor of 10 every 4.9 years (Year-1998.79)/ 2.1 Period (s) = 11.1 * e Rotation Period (s) Year

  17. MLRO lunar observations

  18. MLRO lunar observations

  19. MLRO MM C-MENDES MLRO MM C-MENDES Two color SLR

  20. C-MENDES MM MENDES Differences wrt MLRO DD

  21. Quantum telecommunications

  22. Conclusions • Millimeter-level single shot precision • Two-color capable (355 & 532 nm), Moon capable • Ready for other experiments (transponders, quantum, active optics) • Severe funding problems

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