Author Topic: NASA Restore-L LEO servicing  (Read 10962 times)

Offline Jim

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Re: NASA Restore-L LEO servicing
« Reply #20 on: 01/18/2017 06:02 PM »

OrbitalATK intend to start with a space tug then evolve it add servicing and refuelling capabilities to it. The space tug will latch onto satellite engine bell and take over all propulsion jobs. Have signed customers for 2019-2020 launch.See OA thread for more info.


That is for GEO comsats, which have different requirements than a LEO spacecraft.  GEO Comsats only point in one direction and have the same basic design.  Also, then again, they don't need a "tug" with an engine.  Just some station keeping thrusters.

Offline TrevorMonty

Re: NASA Restore-L LEO servicing
« Reply #21 on: 01/18/2017 07:01 PM »



  Also, then again, they don't need a "tug" with an engine.  Just some station keeping thrusters.

One market OA tug will address is repositioning GEO satellites. Allows satellite to conserve its fuel for station keeping.

The following is my idea may not be practical.
If tug is available to place satellite in grave yard orbit, then satellite can also use fuel reserved for disposal to extend its life.

Offline TakeOff

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Re: NASA Restore-L LEO servicing
« Reply #22 on: 01/19/2017 08:00 PM »
Why refuel satellites? Why not let the "Restore-L" instead tug the satellite with its own engine? It should be much easier and safer and one doesn't need to care about what fuel type the satellite originally had.

Because a "tug" isn't needed.  No "engine" is need.  The propellant is for attitude control.  Attaching another spacecraft is not that simple.  The mass properties of the stack is different.  The attached spacecraft would interfere with look angles of sensors and instruments.  It would require sending commands to two spacecraft to point and take data.
Hubble is pointed with reaction wheels and was boosted to higher altitude by the space shuttle. Wouldn't that be applicable to many satellites in LEO, but with a small tug in place of the shuttle? During satellite operations the tug could be undocked and at standby nearby until next orbital correction is needed, or go off to another servicing mission.

What about designing satellites such that its fuel tank with thrusters is replaceable? When it is getting empty, it is undocked and discarded while a tug brings a new identical fuel tank with thrusters to replace it. No need then to transfer fuel in microgravity.
« Last Edit: 01/19/2017 08:01 PM by TakeOff »

Offline Jim

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Re: NASA Restore-L LEO servicing
« Reply #23 on: 01/20/2017 11:07 AM »

Hubble is pointed with reaction wheels and was boosted to higher altitude by the space shuttle. Wouldn't that be applicable to many satellites in LEO, but with a small tug in place of the shuttle? During satellite operations the tug could be undocked and at standby nearby until next orbital correction is needed, or go off to another servicing mission.


Hubble was an exception.  It was designed for shuttle servicing and hence had to be in a low orbit that would require reboost.   There few to no other like Hubble.  Most spacecraft are placed is orbits driven by science and the requirements and not be low enough for shuttle servicing.  Hubble should have resided at L2 like JWST and SIRTF for scienc[quote



What about designing satellites such that its fuel tank with thrusters is replaceable? When it is getting empty, it is undocked and discarded while a tug brings a new identical fuel tank with thrusters to replace it. No need then to transfer fuel in microgravity.

That doesn't place the thrusters in the locations.  Also, the propellant is not near the CG


Offline TrevorMonty

Re: NASA Restore-L LEO servicing
« Reply #24 on: 01/20/2017 02:08 PM »
Talking of JWST, guy from Restore L fiso webcast is trying to convince JWST team to paint a pattern on JWST which makes capturing it easier. JWST is not serviceable but that doesn't stop a tug attaching its self and taking over propulsion. Could even bring it back to cis lunar station for investigation if not repair.

Offline jongoff

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Re: NASA Restore-L LEO servicing
« Reply #25 on: 01/21/2017 01:52 AM »
Talking of JWST, guy from Restore L fiso webcast is trying to convince JWST team to paint a pattern on JWST which makes capturing it easier. JWST is not serviceable but that doesn't stop a tug attaching its self and taking over propulsion. Could even bring it back to cis lunar station for investigation if not repair.

It's called an optical fiducial. Basically it's a very precise shape/pattern that a machine vision system can use to tell what your relative pose (angles) and position to the object are, just by looking at it. Super useful for rendezvous and capture operations, and the stickers to do so weigh only a few grams each if done right.

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Offline Robotbeat

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Re: NASA Restore-L LEO servicing
« Reply #26 on: 01/21/2017 05:28 PM »
It is, however, optional. It just makes machine vision easier. But could be done without it.
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Offline TrevorMonty

Re: NASA Restore-L LEO servicing
« Reply #27 on: 01/21/2017 05:46 PM »
Repair of satellites by crews at DSH could be reality. It would require likes of OA tug to haul them from GEO to DSH. Probably not financially viable for comsats but $B government satellite is different story.

Offline Lar

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Re: NASA Restore-L LEO servicing
« Reply #28 on: 01/22/2017 03:38 AM »
It is, however, optional. It just makes machine vision easier. But could be done without it.
Worth a few grams though, I think...?
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Offline Comga

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Re: NASA Restore-L LEO servicing
« Reply #29 on: 01/22/2017 04:01 AM »
(Snip)
Hubble should have resided at L2 like JWST and SIRTF for science
(snip)

SIRTF/Spitzer is not at L2 ;D
And don't "should" all over Hubble. It is what it is for good, and not so good, reasons.
What kind of wastrels would dump a perfectly good booster in the ocean after just one use?

Offline Targeteer

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Re: NASA Restore-L LEO servicing
« Reply #30 on: 08/08/2017 03:10 PM »
https://sslmda.com/html/pressreleases/pr20170808.php

https://sspd.gsfc.nasa.gov/video/RestoreConOpsTechTakeoverRevA.m4v

SSL AND NASA SUCCESSFULLY COMPLETE PRELIMINARY DESIGN REVIEW FOR TRAILBLAZING RESTORE-L ON-ORBIT ROBOTIC SERVICING SPACECRAFT
Program Will Extend the Life of Space Assets and Benefits Science, Exploration, and National Security Missions

PALO ALTO, Calif. – August 8, 2017 — Space Systems Loral (SSL), a leading provider of innovative satellites and spacecraft systems, today announced that it successfully completed the Preliminary Design Review (PDR) for NASA’s Restore-L mission to provide satellite servicing in Low Earth Orbit (LEO).  With the completion of the PDR, Restore-L is proceeding on schedule to the next phase of development and its launch in 2020.

As announced last year, SSL is working with NASA Goddard Space Flight Center’s Satellite Servicing Projects Division (SSPD), to build a spacecraft that will change the nature of how infrastructure in space is managed by, for the first time in history, refueling a satellite in orbit that was not designed for servicing.  Restore-L will use robotics and an advanced suite of technologies to grasp and refuel an existing U.S. government satellite already in LEO with the goal of extending the operational lifetime of space assets, as well as to demonstrate the tools, technologies, and techniques that will help enable future space exploration missions and a new U.S. satellite servicing industry.

The design review took place over a three-day period at SSL’s facilities and demonstrated that the Restore-L design meets system requirements.  Due to the success of the PDR, Restore-L will now proceed to the detailed design phase.

The SSL-built spacecraft will provide the structural support, propulsion, attitude control, data and communications interface, and power to support the Restore-L robotic payload for the trailblazing on-orbit demonstration.

“Satellite servicing in Low Earth Orbit is of great value for NASA exploration and science architectures as well as national security,” said Richard White, president of SSL Government Systems.  “With the PDR successfully completed, we are on track to developing a capability that helps maintain our country’s international position as a leader in advanced space technology.  In addition to enabling high value assets to continue to be used, Restore-L will test crosscutting technologies that have applications for other important NASA missions.”

NASA is also leveraging SSL’s commercial capabilities and experience to help reduce cost on a variety of next-generation missions that enable groundbreaking robotics and automation technologies.  These include a NASA Discovery Mission to explore the asteroid Psyche, and the Dragonfly program, which will demonstrate robotic  satellite assembly on-orbit.
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Offline gongora

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Re: NASA Restore-L LEO servicing
« Reply #31 on: 08/09/2017 03:21 AM »
[SpacePolicyOnline.com] RESTORE-L Passes PDR As Future Remains Cloudy
Quote
NASA’s satellite servicing technology development and demonstration mission, Restore-L, passed a milestone today, successfully clearing Preliminary Design Review (PDR).  The Trump Administration wants to downscale the program significantly however, and while the House and Senate Appropriations Committees have rallied to its defense, only one approved the money needed to keep it on course.
...

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