ANDE-RR Active
ILRS Mission Support Status:
SLR will augment SSN observations to improve pcision orbit determination process:
- Accuracy of 1 m, radial
- Gravity Model errors is expected to provide ~ .44 m in the radial direction for s/c at an altitude of 385 km, at an inclination of 51.66°
- Accuracy of 20 m, along-track
- Gravity Model errors is expected to provide ~ 6.1 m for a s/c at an altitude of 385 km, at an inclination of 51.66°
- 15+ passes per day (once or more per rev from entire SSN/SLR
network) per target of tracking is highly desirable
- SLR and the SSN data can provide this
- SLR tracking should include contributions from the ILRS global network
- 8 per day is acceptable
- SLR and the SSN data can provide this
Current ILRS Tracking Statistics:
| Satellite | Site Name | Station | Start Date | End Date |
No.
Passes |
No.
Points |
No.
Minutes |
|---|---|---|---|---|---|---|---|
| ANDERRP | Changchun |
7237
|
01-Jan-2008
|
26-Feb-2008
|
8
|
47
|
1,410
|
| Graz |
7839
|
25-Mar-2008
|
15-May-2008
|
3
|
48
|
1,440
|
|
| Greenbelt |
7105
|
21-Feb-2008
|
21-Feb-2008
|
2
|
36
|
1,080
|
|
| Herstmonceux |
7840
|
01-Feb-2008
|
13-Mar-2008
|
3
|
23
|
690
|
|
| Katzively |
1893
|
08-May-2008
|
08-May-2008
|
1
|
4
|
120
|
|
| San Fernando |
7824
|
10-Jan-2008
|
10-Jan-2008
|
1
|
4
|
120
|
|
| San Juan |
7406
|
02-Jan-2008
|
16-Feb-2008
|
5
|
122
|
3,660
|
|
| Yaragadee |
7090
|
08-Jan-2008
|
15-May-2008
|
43
|
752
|
22,560
|
ANDE Mission Support Request Form (April 2005):
Name: ANDERR MAA and ANDERR FCal
Host: Naval Research Laboratory
Primary Technical Contact: Andrew Nicholas
Technical Contact Mailing Address: Naval Research Laboratory
Code 7607, 4555 Overlook Avenue, Washington, D.C., 20375 USA
Technical Contact Phone: 202-767-2441
Technical Contact Fax: 202-767-9388
Technical Contact Email: andrew.nicholas@nrl.navy.mil
Alternate Technical Contact: Mark Davis
Alternate Technical Contact Mailing Address: Naval Research Laboratory
Code 7607, 4555 Overlook Avenue, Washington, D.C., 20375 USA
Alternate Technical Contact Phone: 202-767-2829
Alternate Technical Contact Fax: 202-404-1226
Alternate Technical Contact Email: mdavis@ssdd.nrl.navy.mil
Primary Science Contact: Chris Cox
Science Contact Mailing Address: Raytheon Information Solutions
4500 Forbes Blvd., Lanham, MD 20706 USA
Primary Science Contact Phone: 301-614-6094
Primary Science Contact Fax: 301-614-6099
Primary Science Contact Email: Christopher_M_Cox@raytheon.com
Alternate Science Contact: Mark Torrence
Alternate Science Contact Mailing Address: Raytheon Information Solutions
4500 Forbes Blvd., Lanham, MD 20706 USA
Alternate Science Contact Phone: 301-486-3131
Alternate Science Contact Fax: 301-614-6099
Alternate Science Contact Email: Mark.H.Torrence.1@gsfc.nasa.gov
MISSION SPECIFICS:
Scientific or Engineering Objectives of Mission: Determine total atmospheric
density in orbital plane, test deployment system for follow-on flight.
Satellite Laser Ranging (SLR) Role of Mission: Augment SSN observations to improve
pcision orbit determination process.
Anticipated Launch Date: 9 Feb. 2006
Expected Mission Duration: ANDERR MAA (19” diameter sphere) 1 year,
ANDERR Fcal (17.5” diameter sphere) 2 yrs
ANTICIPATED ORBITAL PARAMETERS:
Altitude: 335 km
Inclination: 51.6 deg
Eccentricity: 0.0007
TRACKING REQUIREMENTS:
Tracking Schedule: targeted campaigns, continuous when available
Spatial Coverage: back to back revs requested
Temporal Coverage: TBD
Data Accuracy: Better than 1 cm
OPERATIONS REQUIREMENTS:
Mission Coordinator (ILRS, Subnetwork, etc.):
Priority of SLR for POD: Moderate
Other Sources of POD (GPS, PRARE, Doppler, etc.): SSN radar & optical
Primary Analysis Center: Naval Research Laboratory
Normal Point Time Span (sec): 5 s
Subnetworks/Stations Requested to Track: Any Available
Data Delivery Time Requirements: TBD
RETROREFLECTOR ARRAY INFORMATION:
Description of Array and Location: Each spacecraft is fitted with a set of thirty 12.7 mm
(Edmunds ala Starshine) diameter optical retro reflectors for SLR located along
latitudinal bands at ±90º, ±52.5º and ±15º with one, six and eight retros per band
respectively.
Technical Contact for Array Correction/Center of Mass: Robert Kessel
Phone No.: 202-404-6170
E-mail Address: kessel@ncst.nrl.navy.mil
Other Comments: The science goals of this mission include:
- Verify the secular decrease in thermospheric density (and secular thermospheric cooling), which is largest at solar minimum;
- Indicate whether the secular effect has saturated and whether reductions in greenhouse gas release into the atmosphere will reverse the cooling trend detected in past orbit data;
- Confirm or refute severe deficiencies in NRLMSISE-00 and similar empirical thermospheric models, as inferred from long-term orbit data;
- Revolutionize the formulation of the NRLMSISE-00 thermospheric solar response model (under the likely result that NRLMSISE-00 significantly overestimates the total mass density at solar minimum);
- Allow pcise studies and testing of models for estimating satellite and spacecraft ballistic coefficients, greatly improving estimates of drag in pdictions of orbit trajectories of operational systems;
- Combined with technology developed at NRL, will permit direct determination and improve estimates of true spacecraft and satellite ballistic coefficients and of local thermospheric density for daily drag pdiction.
