the matera laser ranging observatory fsp-06, frascati, italy, 21-23 march 2006 giuseppe bianco...

The Matera Laser Ranging The Matera Laser Ranging

Observatory Observatory

FSP-06, Frascati, Italy, 21-23 March 2006

Giuseppe BiancoCentro di Geodesia Spaziale, ASI – Matera, Italy

SLR concept

LAGEOS

Sta

rlett

e

Ste

lla

LA

GEO

S-I

LA

GEO

S-I

I

Eta

lon

-I &

-II

GFZ

-1

Ajisai

InclinationPerigee (km)

diameter (cm)

mass (kg)

98.6°80024

47.3

50°81024

47.3

52.6°5,620

60405.4

109.8°5,860

60411

50°1,490215685

51.6°39620

20.6

64.8°19,120129.41415

Geodetic satellites

Lunar targets

Lunar reflectors

Centro di Geodesia SpazialeGiuseppe Colombo

Matera, Italy

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)

MLRO specificationsMLRO specifications

Astronomical quality telescope, 1” pointing accuracy, 1.5 m aperture

TX-RX table

LAGEOS II observations from MLROLAGEOS II observations from MLRO

-2 -1.5 -1 -0.5 0 0.5 1 1.5 20

100

200

300

400

500

600

700

Residuals (cm)

Nu

mb

er

of

ob

serv

atio

ns

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

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

-20

-15

-10

-5

0

5

10

15

20

7000 7500 8000 8500 9000 9500 10000

Sh

ot-

by-s

ho

t re

sid

ua

l (m

m)

Time (sec)

-20

-15

-10

-5

0

5

10

15

20

7000 7500 8000 8500 9000 9500 10000

Sh

ot-

by-s

ho

t re

sid

ua

l (m

m)

Time (sec)

Ajisai residual analysisAjisai residual analysis

LAGEOS I residual analysisLAGEOS I residual analysis

Time (sec) from the pass start

-20

-15

-10

-5

0

5

10

15

20

0 500 1000 1500 2000 2500 3000

Lageos 2 pass on 29/05/2000

number of obs. = 14481

mean = 0.00 mm rms= 5.67 mm

Sho

t -by

-sho

t res

idua

l s (

mm

)LAGEOS II MLRO observations

LAGEOS II residual analysisLAGEOS II residual analysis (October 15, 1998)(October 15, 1998)

LAGEOS II residual analysisLAGEOS II residual analysis (May 29, 2000)(May 29, 2000)

1998.5 1999 1999.5 2000 2000.5 2001 2001.5 2002 2002.510

15

20

25

30

35

40

45

50

55

60

Observed LAGEOS-2 down-spinning rate (exponential fit)

Year

Ro

tatio

n P

eri

od

(s)

post-fit RMS 88.5 ms

Down-spinning rate: factor of 2 every 1.5 years factor of 10 every 4.9 years Period (s) = 11.1 * e(Year-1998.79)/ 2.1

MLRO lunar observations

MLRO lunar observations

MLROMMC-MENDES

MLROMMC-MENDES

Two color SLR

Differences wrt MLRO DD

10 20 30 40 50 60 70 80 90-30

-25

-20

-15

-10

-5

0

5

10Difference of Models w.r.t. MLRO observed

Resid

uals

(m

m)

Elevation (deg)

10 20 30 40 50 60 70 80 90-30

-25

-20

-15

-10

-5

0

5

10Difference of Models w.r.t. MLRO observed

Resid

uals

(m

m)

Elevation (deg)

C-MENDES

MM

MENDES

Quantum telecommunications

ConclusionsConclusions

Two-color capable (355 & 532 nm), Moon capable

Ready for other experiments (transponders,

quantum, active optics)

Severe funding problems

Millimeter-level single shot precision