Editing Lunar Reconnaissance Orbiter part 2

Jump to navigation Jump to search

Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.

Latest revision Your text
Line 5: Line 5:
 
  Click '''Sel''' until ''Ref Moon'' is displayed in yellow letters.
 
  Click '''Sel''' until ''Ref Moon'' is displayed in yellow letters.
 
  Click '''MOD''' 3 times and set ''Accuracy'' to ''Max''.
 
  Click '''MOD''' 3 times and set ''Accuracy'' to ''Max''.
  Click '''MOD''' twice to restore Map view showing ''EqI''(equatorial inc) parameter.
+
  Click '''MOD''' again to restore Map view.
  
 
  In the left MFD, click '''MNU''', then '''Course'''.
 
  In the left MFD, click '''MNU''', then '''Course'''.
 
  Click '''Nxt''' 4 times so that ''Delta Velocity'' is highlighted, and click '''Set'''.
 
  Click '''Nxt''' 4 times so that ''Delta Velocity'' is highlighted, and click '''Set'''.
 
  Click '''TGT''', and enter '''Moon'''.
 
  Click '''TGT''', and enter '''Moon'''.
  Click '''Nxt''', then '''Set''', and set ''TEj'' to '''400'''.
+
  Click '''Nxt''' 5 times so that ''dVf'' is highlighted, click '''Set''', and enter '''0'''.
Click '''Nxt''' three times until ''dVf'' is highlighted.
 
Click '''Set''', and enter '''0'''.
 
 
  In the right MFD click '''PG''', then '''Plan'''.
 
  In the right MFD click '''PG''', then '''Plan'''.
  In the left MFD, adjust '''dVf''', and '''dVp''' so that ''EqI'' and ''PeA'' in the right MFD
+
  In the left MFD, adjust '''dVf''', and '''dVp''' so that ''RIn'' and ''PeA'' in the right MFD
  are as close as possible to ''90'' degrees and ''350k'' as possible.  
+
  are as close as possible to ''90'' degrees and ''216k'' as possible.  
 
Be as accurate as possible here. LRO is planning on avoiding a mid-course correction if possible. In orbiter, we will probably still have to do a small
 
Be as accurate as possible here. LRO is planning on avoiding a mid-course correction if possible. In orbiter, we will probably still have to do a small
 
MCC.
 
MCC.
  When your adjustments are done, click '''Prv''' until ''TEj'' is highlighted and
+
  When your adjustments are done, click '''PG''', '''BV''', and '''AB'''.
set it to '''0'''. Click '''PG''', '''BV''', and '''AB'''.
 
 
  When the burn is done, click '''BV''', and '''PG'''. In the Right MFD, click '''Plan''' to turn off plan mode.
 
  When the burn is done, click '''BV''', and '''PG'''. In the Right MFD, click '''Plan''' to turn off plan mode.
  
 
=== Mid course correction/LRO ===
 
=== Mid course correction/LRO ===
 +
 +
Switch focus back to LRO.
 +
 +
Press the '''k''' key to deploy the LRO solar panels
 +
Once the panels have fully unfolded, and rotated to face the sun,
 +
press the '''g''' key to deploy the antenna
 +
 +
In the Left MFD select IMFD, click on '''MNU''' and select '''Map'''.
 +
Make sure '''TgT''' is '''Moon''', and click '''Sel''' until ''Ref'' is ''Moon''.
  
 
Wait until ''PeT'' is about ''350k''<br>
 
Wait until ''PeT'' is about ''350k''<br>
In the left MFD set '''dVp''' and '''dVf''' to '''0'''.
+
Select IMFD in the Right MFD
  In the right MFD, click '''Plan''' so that the green line turns blue.
+
 
  In the left MFD adjust '''dVp''' and '''dVf''' so that ''EqI'' and ''PeA'' in the left MFD are as close as possible  
+
Click on '''MNU''', then '''Course'''. Click '''Nxt''' 4 times until ''Delta Velocity'' is highlighted, then click '''Set'''.
  to 90 degrees and 350k respectively
+
Click '''Nxt''' 5 times until ''dVf'' is highlighted, click '''Set''' and enter '''0'''.
 +
Click on '''TgT''' and enter '''Moon'''.
 +
  In the Left MFD, click '''Pg''', then '''Plan''' so that the green line turns blue.
 +
  In the right MFD adjust '''dVp''' and '''dVf''' so that ''RIn'' and ''PeA'' in the left MFD are as close as possible  
 +
  to 90 degrees and 216k respectively
 
  When these adjustments are finished, click '''PG''','''BV''', then '''AB''' in the right MFD.  
 
  When these adjustments are finished, click '''PG''','''BV''', then '''AB''' in the right MFD.  
 
  When the burn completes, click '''Plan''' in the left MFD so the blue line returns to green.
 
  When the burn completes, click '''Plan''' in the left MFD so the blue line returns to green.
Line 34: Line 44:
 
[[Image:Lromid.jpg]] After mid course correction
 
[[Image:Lromid.jpg]] After mid course correction
  
Be as accurate as possible, as this will be our last course correction for LRO.
+
Repeat these adjustments as necessary as you get closer to the moon.
  
 
=== Course correction/LCROSS ===
 
=== Course correction/LCROSS ===
Line 59: Line 69:
 
The LRO main engine is not strong enough to get it into a circular orbit in one try. It will take 4 burns over 12 orbits to achieve the initial 216km x 30km commissioning orbit, with periselene over the South Pole. The first burn is critical in that we must avoid a situation where we are "weakly captured" or not captured at all. The orbit eccentricity at the end of our first burn must be 0.8 or less.  
 
The LRO main engine is not strong enough to get it into a circular orbit in one try. It will take 4 burns over 12 orbits to achieve the initial 216km x 30km commissioning orbit, with periselene over the South Pole. The first burn is critical in that we must avoid a situation where we are "weakly captured" or not captured at all. The orbit eccentricity at the end of our first burn must be 0.8 or less.  
  
When LRO's PeT is about 5k, select IMFD in the left MFD, and Orbit MFD in the right.  
+
When LRO's PeT is about 10k, select IMFD in the left MFD, and Orbit MFD in the right.  
  Click on the '''HUD''' button on the right MFD. Change the MFD to IMFD map mode.
+
  Click on the '''HUD''' button on the right MFD. In the left MFD click '''MNU''', then '''Orbital'''.
Set the '''TGT''' to '''LRO''', '''REF''' to '''Moon'''.
+
  Click '''TgT''', then type '''r'''.
  Click '''PG''', then '''Plan'''.
+
Note that The burn time to a circular orbit is over 4k seconds (over an hour!). Make sure rotational mode is selected.
  In the left MFD select IMFD course, then click on '''PRV''' and select ''Delta Velocity'' mode.  
+
  At 2k seconds to PeT, select Retrograde mode on the hud. When retrograde attitude 
  Click '''REF''' and enter '''Moon''', and click '''TGT''', and enter '''LRO'''.
+
  is established, de-select retrograde mode.
  Select ''dVp'', and click on '''+''' or '''-''' until the ''EqI'' in the right MFD is ''90'' degrees.  
+
  Start the engine by pressing '''numpad-+''' and tap the '''CTRL''' key to keep it burning.
  Click '''PG''', '''BV''', and '''AB'''.
+
Notice that the PeA in the right MFD is decreasing.  
When this burn is finished, in the left MFD
+
  Use the numpad '''1''' and '''3''' keys to move the attitude closer to what the Orbital IMFD mode
set ''TEj'' to '''3k''', and set ''dVf'' to '''-520'''.
+
  thinks it should be until the PeA starts increasing.
In the right MFD, select Orbit MFD. Set '''FRM''' to ''EQU'', and '''PRJ''' to ''Ship''.
+
Keep adjusting the attitude between these points to keep the PeA as close as possible to 216km.  
In the left MFD, adjust '''TEj''' (affects mostly ''PeA'') and '''dVf''' (affects mostly ''ApA'')
+
  When the ApA. parameter in the Right MFD is 3160km, press the '''numpad-*''' key to stop the burn.
  until the ''PeA'' and ''ApA'' as shown in the bottom left of the left MFD are as close
+
The LRO then completes 4 orbits at 3160km x 216km before the next burn,
as possible to ''216k'' and ''3.16M'' respectively.
+
you can switch focus to AV020Centaur and enjoy the view as it passes by the moon.
  Continue these adjustments until both parameters are as close as possible.
 
In the Left MFD, click '''PG''', '''BV''', and '''AB'''.
 
[[Image:LOI.jpg|frame|left|IMFD setup for the LOI burn]]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
When the burn is finished, LRO then completes 4 orbits at 3160km x 216km before the next burn.
 
you can switch focus to AV020Centaur and enjoy the view as it passes by the moon.
 
 
   
 
   
After the flyby, switch back to LRO and after 4 orbits, wait until ''PeT''
+
After the flyby, switch back to LRO and after 4 orbits, wait until PeT
is ''1k''. Press the '''retrograde''' button, and de-select it when retrograde attitude is achieved.  
+
is 800k. Press the retrograde button, and de-select it when retrograde attitude is achieved.  
 
  Follow the procedure above to make the second burn,
 
  Follow the procedure above to make the second burn,
  using initial values of ''TEj'' = '''600''' seconds from PeT, ''dVf'' = '''-194''',
+
  keeping PeA as close as possible to 216km, and burn until ApA is 967km.
and ''dVo'' = '''57.6''', keeping ''PeA'' as close as possible to ''216km'', and ''ApA'' at ''967km''.
 
the ''dVo'' parameter will affect ''PeA''.  
 
  
 
After another 5 complete orbits at 216km x 967km, make a third burn to circularize your orbit at 216km.
 
After another 5 complete orbits at 216km x 967km, make a third burn to circularize your orbit at 216km.
You will not be able to completely circularize the burn with IMFD course, so you can use IMFD orbital mode
 
for a final touch up.
 
  
 
Make a final burn on your next pass over the North Pole to reduce your PeA to 30km near the South Pole.
 
Make a final burn on your next pass over the North Pole to reduce your PeA to 30km near the South Pole.
Line 173: Line 144:
 
=== LRO Orbit Circularization ===
 
=== LRO Orbit Circularization ===
 
60 days after your last LRO orbit insertion burn,
 
60 days after your last LRO orbit insertion burn,
switch focus to LRO, and at Perilune over the south pole, burn retrograde until the ApA is 70km.
+
switch focus to LRO, and at Perilune over the south pole, burn retrograde until the ApA is 50km.
  
=== LCROSS Lunar pole targeting ===
+
=== LCROSS Lunar pole targetinjg ===
 
Switch focus back to AV020Centaur. When the PeT is 130k Set IMFD map in the left MFD and IMFD Base approach in the right MFD.
 
Switch focus back to AV020Centaur. When the PeT is 130k Set IMFD map in the left MFD and IMFD Base approach in the right MFD.
 
  In the left MFD set target Moon and center to Self ('''x''')
 
  In the left MFD set target Moon and center to Self ('''x''')
 
  Click on '''Sel''' until ''Ref Moon'' is displayed with a negative PeA.
 
  Click on '''Sel''' until ''Ref Moon'' is displayed with a negative PeA.
 
  In the right MFD click '''REF''', and type '''Moon'''.  
 
  In the right MFD click '''REF''', and type '''Moon'''.  
  Click '''Nxt''' until ''Hint'' is highlighted. Click '''Set''' and type the value shown for ''PeT'' in the left MFD.
+
  Click '''Nxt''' until ''Hint'' is highlighted. Click '''Set''' and type the value shown for ''PeA'' in the left MFD.
  Click '''Prv''' until ''Lat'' is highlighted. Click '''Set''' and type '''89.9'''
+
  Click '''Prv''' until ''Lat'' is highlighted. Click '''Set''' and type '''-89.9'''
  Click '''Nxt''', then '''Set''' and set the ''Alt'' to '''0'''.
+
  Click '''Nxt''', then '''Set''' and set the ''Alt''' to '''0'''.
  Click '''Nxt''', then '''Set''' and set the ''ReA'' (Re-enty Angle) to '''70'''
+
  Click '''Nxt''', then '''Set''' and set the ''ReA'' (Re-enty Angle) to '''75'''
 
  Click '''Nxt''', then '''Set''' and set the ''Ant'' parameter to '''0'''
 
  Click '''Nxt''', then '''Set''' and set the ''Ant'' parameter to '''0'''
 
  You may need to reset the ''Hint'' Parameter at this time to the current PeT.
 
  You may need to reset the ''Hint'' Parameter at this time to the current PeT.
Line 193: Line 164:
  
 
=== LCROSS LRO targeting ===
 
=== LCROSS LRO targeting ===
 +
* ~7 hours prior to impact, LCROSS will separate from Centaur upper stage and perform a ~4-minute delay maneuver (~23 m/s)  to enable LCROSS to fly through Centaur impact plume
 
  In the left MFD, click '''REF''' and type '''Moon''', then click '''TGT''' and type '''LRO'''
 
  In the left MFD, click '''REF''' and type '''Moon''', then click '''TGT''' and type '''LRO'''
 
  Click '''PRJ''' until ''Target'' is displayed in the lower left corner.
 
  Click '''PRJ''' until ''Target'' is displayed in the lower left corner.
Line 217: Line 189:
  
 
=== LCROSS Separation ===
 
=== LCROSS Separation ===
* ~7 hours prior to impact, LCROSS will separate from Centaur upper stage and perform a ~4-minute delay maneuver (~23 m/s)  to enable LCROSS to fly through Centaur impact plume
 
 
Wait until Pet in the Left MFD is 25k.  
 
Wait until Pet in the Left MFD is 25k.  
 
  In the right MFD, minimize ''dV'' by adjusting ''ReA'', and make the burn.
 
  In the right MFD, minimize ''dV'' by adjusting ''ReA'', and make the burn.
Line 262: Line 233:
 
[http://lunar.gsfc.nasa.gov/library/IAC-07-C1_7_06.pdf Mission Design And Operations Considerations For NASA’S LRO]<br>
 
[http://lunar.gsfc.nasa.gov/library/IAC-07-C1_7_06.pdf Mission Design And Operations Considerations For NASA’S LRO]<br>
 
[http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070021535_2007013516.pdf Mission Design for the Lunar Reconnaissance Orbiter]<br>
 
[http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070021535_2007013516.pdf Mission Design for the Lunar Reconnaissance Orbiter]<br>
[http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20080038058_2008037121.pdf LRO Navigation Overview]
 
 
== Copyrights and Disclaimers ==
 
*LRO/LCROSS Orbiter Add-On Copyright 2008 Brian Jones
 
*LRO/LCROSS Documentation Copyright 2008 Brian Jones and Chris Coffin
 
*Commercial redistribution prohibited.
 
*Permission granted for use to NASA GSFC and ASU LROC
 
*Permission granted for Educational and personal use.
 
*Not for Navigational purposes. No warranty, express or implied.
 
*Not liable for any damages arising from use of this software or documentation.
 
 
==See also==
 
[[Lunar Reconnaissance Orbiter]]
 
  
[[Category:Articles]]
+
== TODO ==
[[Category:Add-ons]]
+
*Fix procedure for actual mission parameters
[[Category:Spacecraft add-ons]]
+
** updated Launch date? - currently: 2nd March 2009 05:26:27
[[Category: Add-ons by BrianJ]]
+
** LCROSS North pole impact
[[Category:Tutorials]]
+
*** Target a specific crater
 +
** Try IMFD slingshot mode to refine flyby once in lunar SOI
 +
* Add keyboard commands section
 +
* Convert to .CHM for help mode within orbiter
 +
* Add images
 +
** IMFD map periapsis projection to show LCROSS orbit inclination

Please note that all contributions to OrbiterWiki are considered to be released under the GNU Free Documentation License 1.2 (see OrbiterWiki:Copyrights for details). If you do not want your writing to be edited mercilessly and redistributed at will, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource. Do not submit copyrighted work without permission!

To protect the wiki against automated edit spam, we kindly ask you to solve the following hCaptcha:

Cancel Editing help (opens in new window)