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