The presentation captures the results of the 2015 inclination adjust maneuver series for the Aqua and Aura spacecraft. The predictions for the 2016 IAM series are also discussed

Ruel, Avery C.

Tracewell, David A.

NASA Technical Reports Server

Mission Operations Working Group
1
International Earth Science Constellation
Mission Operations Working Group
June 02-04, 2015
Aqua and Aura Results from Spring 2015 IAM Campaign
(as of 4/14/2015)
Avery C. Ruèl & David A. Tracewell
EOS FDS, esmo-eos-fds@lists.nasa.gov, +1.301.416.5050
https://ntrs.nasa.gov/search.jsp?R=20150011110 2019-08-31T07:33:55+00:00Z
Mission Operations Working Group
Aqua Spring 2015 Series Summary (as of 4/14/2015)
• Aqua has performed 3 of the 5 planned inclination maneuvers from March 18th
to April 22rd prior to final slide review (4/14/2015)
– Updates will be provided to MOWG for the last two Aqua Inc maneuvers and the 
total Delta-Inc/RAAN/Delta V and predicted MLT prior to the 2016 IAM series
• After three Aqua Inc maneuvers, the total inclination change was 0.88% cold
compared to the latest 2015 IAM predictions delivered to MOWG members
– Assuming the last two Aqua Inc maneuvers perform exactly as predicted 
2
Inc # Date Burn Duration (sec)
Predicted Delta 
- Inc (deg)
Achieved 
Delta-Inc (deg)
Predicted Delta 
- RAAN (deg)
Achieved Delta 
- RAAN (deg)
Predicted Delta 
- V (m/s)
Achieved Delta 
- V (m/s)
43 18-Mar-15 550 -0.00879 -0.00871 0.00099 0.00110 1.167 1.155
44 25-Mar-15 550 -0.00879 -0.00875 0.00051 0.00050 1.162 1.153
45 1-Apr-15 550 -0.00877 -0.00866 0.00005 0.00006 1.158 1.141
46 15-Apr-15 550 -0.00870 - -0.00084 - 1.152 -
47 22-Apr-15 550 -0.00862 - -0.00123 - 1.147 -
Totals: -0.04367 -0.02612 -0.00052 0.00166 5.787 3.449
delta-I difference: 0.00023 deg
percent error: 0.88% COLD
Mission Operations Working Group
Aura Spring 2015 Series Summary (as of 4/14/2015)
• Aura has performed 3 of the 5 planned inclination maneuvers from March 19th
to April 23rd prior to final slide review (4/14/2015)
– Updates will be provided to MOWG for the last two Aura Inc maneuvers and the 
total Delta-Inc/RAAN/Delta V and predicted MLT prior to the 2016 IAM series
• After three Aura Inc maneuvers, the total inclination change was 0.71% cold
compared to the latest 2015 IAM predictions delivered to MOWG members
– Assuming the last two Aqua Inc maneuvers perform exactly as predicted 
3
Inc # Date Burn Duration (sec)
Predicted Delta 
- Inc (deg)
Achieved 
Delta-Inc (deg)
Predicted Delta 
- RAAN (deg)
Achieved Delta 
- RAAN (deg)
Predicted Delta 
- V (m/s)
Achieved Delta 
- V (m/s)
40 19-Mar-2015 397.5 -0.00949 -0.00939 0.00061 0.00075 1.247 1.230
41 26-Mar-2015 397.5 -0.00950 -0.00949 0.00009 0.00025 1.242 1.244
42 02-Apr-2015 397.5 -0.00946 -0.00937 -0.00042 -0.00025 1.236 1.225
43 16-Apr-2015 397.5 -0.00931 - -0.00136 - 1.231 -
44 23-Apr-2015 397.5 -0.00921 - -0.00178 - 1.226 -
Totals: -0.04697 -0.02825 -0.00287 0.00075 6.182 3.699
delta-I difference: 0.00020 deg
percent error: 0.71% COLD
Mission Operations Working Group
Aqua/Aura Spring 2016 Campaign (Pre-2015 IAM Series)(1/2)
• Aqua has 4 inclination maneuvers planned for Spring 
2016
– Aqua’s predicted ideal burn date occurs on Apr 1, 2016
– 4 maneuvers will occur after the ideal burn date
• Aura has 4 inclination maneuvers planned for Spring 
2016
– Aura’s predicted ideal burn date occurs on Mar 26, 2016
– 4 maneuvers will occur after the ideal burn date
Note: performing maneuvers off of the ideal date slightly 
decreases burn efficiency
4
Mission Operations Working Group
Aqua/Aura Spring 2016 Campaign (2/2)
• Approach inclination maneuvers similarly to the 2009-
2015 series
– Aqua/Aura utilizing historical performances of yaw angles to 
aid in the WRS-2 control strategy
– Aqua’s maneuvers now have a more accurately predicted SMA 
change based on a new trending method, implemented in the 
2014 series
5
Mission Operations Working Group
Aqua/Aura Maneuver Schedule (Pre-2015 IAM Series)
6
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
March 27
Easter
28 29 30 31 April 1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20
Aqua IAM#48
21
Aura IAM#45
22 23
24 25 26 27
Aqua IAM#49
28
Aura IAM#46
29 30
May 1 2 3 4 5 6 7
8 9 10 11
Aqua IAM#50
12
Aura IAM#47
13 14
15 16 17 18
Aqua IAM#51
19
Aura IAM#48
20 21
22 23 24 25
Aqua Backup
26
Aura Backup
27 28
Tentative Aqua/Aura 2016 Inclination Maneuver Series Schedule
Mission Operations Working Group
Aqua Long-Term Predictions (Pre-2015 IAM Series)
• From 2014 Aqua Lifetime Report, Aqua has enough fuel 
to complete full inclination series through 2020, 
assuming no unusable fuel in the lines and 28.4 kg fuel 
remaining for constellation exit
7
Inclination 
Series
Number of 
Maneuvers
Burn 
Duration (s)
Total 
delta-I 
(deg)
Total 
delta-v 
(m/s)
Spring 2015 5 550 -0.0454 6.025
Spring 2016 4 550 -0.0349 4.722
Spring 2017 4 550 -0.0348 4.644
Spring 2018 4 550 -0.0345 4.572
Spring 2019 5 550 -0.0423 5.622
Spring 2020 4 550 -0.0331 4.427
Mission Operations Working Group
Aqua Fuel Usage and Projections (Pre-2015 IAM Series)
8
Mission Operations Working Group
Aura Long-Term Predictions (Pre-2015 IAM Series)
• From 2014 Aura Lifetime Report, Aura has enough fuel 
to complete full inclination series through 2022, 
assuming no unusable fuel in the lines and 28.5 kg fuel 
remaining for constellation exit
9
Mission Operations Working Group
Aura Fuel Usage and Projections (Pre-2015 IAM Series)
10
Mission Operations Working Group
Aqua Long-Term MLT Predictions (Pre-2015 IAM Series)
13:36:15
13:35:45
13:35:15
13:35:30
13:35:00
13:36:30
13:36:00
M
L
T
 
a
t
 
t
h
e
 
A
s
c
e
n
d
i
n
g
 
 
N
o
d
e
 
(
h
h
:
m
m
:
s
s
)
11
Aqua’s MLT requirement is 13:30 ±15 minutes.  The mission has agreed to fly within 
tighter bounds for improved science data collection, as well as, more repeatability of 
delta-I maneuvers from year to year.
Mission Operations Working Group
Aqua/Aura Long-Term MLT Predictions (Pre-2015 IAM Series)
12
Aqua
Aura
14:00
13:30
13:45
13:51
13:48
13:42
13:39
13:36
13:33
13:57
13:54
M
L
T
 
a
t
 
t
h
e
 
A
s
c
e
n
d
i
n
g
 
 
N
o
d
e
 
(
h
h
:
m
m
:
s
s
) Aura’s MLT requirement is 13:45 ±15 minutes.  The mission is 
required to maintain a specified MLT separation with Aqua.  As a 
result, the MLT separation has lower and upper limits of 8.25 and 
8.75 minutes, respectively.


Aqua and Aura Results from Spring 2015 IAM Campaign

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server