Author Topic: SPADEX - Space Docking Experiment (Orbital Rendezvous)  (Read 1470 times)

Offline sanman

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India's Dept of Space has approved Rs.10 Crores in funding to ISRO for an Orbital Rendezvous & Docking experiment between 2 satellites. The experiment will involve transfer of material between the 2 satellites, in order to demonstrate the potential for refueling capability between spacecraft.

https://tecake.in/news/space/isros-new-spacecraft-docking-berthing-eyes-putting-human-orbit-33048.html

http://www.outlookindia.com/website/story/isro-to-develop-technology-that-will-help-refuel-spacecrafts-and-transfer-humans/298719


Some news media are using the term "docking and berthing" in connection with this mission, but it's not clear to me what, if any, aspect of the mission would really qualify as berthing.

Wikipedia has the following to say about Docking and Berthing:

https://en.wikipedia.org/wiki/Docking_and_berthing_of_spacecraft

Quote
Docking specifically refers to joining of two separate free-flying space vehicles.

Berthing refers to mating operations where an inactive module/vehicle is placed into the mating interface of another space vehicle by using a robotic arm.

Does anyone know whether this "docking and berthing" description is coming from ISRO itself?

Additionally, I'm eager to learn more details about the overall mission in general, which will be another landmark milestone mission for ISRO in the development of another key technology for spaceflight - including even possibly for human spaceflight. Also, what are the existing examples and precedents for using orbital docking in non-HSF applications?
« Last Edit: 06/08/2017 07:53 AM by sanman »

Offline chota

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Re: ISRO Orbital Rendezvous & Docking Experiment
« Reply #1 on: 05/02/2017 05:19 PM »
Here is an old (2013) article by antariksh to get some context

http://antariksh-space.blogspot.in/2013/07/isro-rendezvous-docking-experiment.html

Credits: http://antariksh-space.blogspot.in and ISRO







Offline sanman

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Re: ISRO Orbital Rendezvous & Docking Experiment
« Reply #2 on: 05/03/2017 04:12 AM »
Yeah, thanks, I had indeed seen that one. Now that the funding has been approved, I wonder what the timeline would then be for this Orbital Rendezvous & Docking mission?

Offline sanman

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Re: ISRO Orbital Rendezvous & Docking Experiment
« Reply #3 on: 06/08/2017 07:52 AM »
So I'd read that this orbital docking experiment is called SPADEX (SPAce Docking EXperiment) - and isn't this SPADEX actually on the manifest for the upcoming PSLV C38 mission scheduled to launch in a couple of weeks? Gee, I hadn't realized they'd snuck that in there.  :P

How long would it take to carry out this experiment?

Here's some old info from Reddit:

https://www.reddit.com/r/ISRO/comments/3l1xdl/proposed_rendezvous_and_docking_experiment/

Offline seshagirib

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Re: ISRO Orbital Rendezvous & Docking Experiment
« Reply #4 on: 06/08/2017 10:32 AM »
So I'd read that this orbital docking experiment is called SPADEX (SPAce Docking EXperiment) - and isn't this SPADEX actually on the manifest for the upcoming PSLV C38 mission scheduled to launch in a couple of weeks? Gee, I hadn't realized they'd snuck that in there.  :P

How long would it take to carry out this experiment?

Here's some old info from Reddit:

https://www.reddit.com/r/ISRO/comments/3l1xdl/proposed_rendezvous_and_docking_experiment/

Do you have any source link for this info ( SPADEX on PSLV-C38) ?

Offline sanman

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Re: ISRO Orbital Rendezvous & Docking Experiment
« Reply #5 on: 06/09/2017 01:33 AM »
Do you have any source link for this info ( SPADEX on PSLV-C38) ?

There was this NSF thread:

https://forum.nasaspaceflight.com/index.php?topic=41762.msg1604341#msg1604341

The couple EMISAT/SPADEX comes originally from this source:
http://nrsc.gov.in/sites/all/pdf/modnrscUIM%20_Raghava%20Reddy_1.pdf

EMIsat seems to be an Earth observation satellite (anyone knows what this acronym means?)
SPaDEx seems to be a Space Docking Experiment between 2 mini satellites




I dunno what this source is, but here's something Google turned up:

http://www.sworld.com.au/steven/space/india-man.txt

Quote

                      INDIAN LAUNCH MANIFEST ( 5 Jun 2017)

    Date    Launch Vehicle  Payload
--------------------------------------------------------------------------------
...

#23 Jun 17  PSLV    C38     Cartosat 2E (Cartosat 2 Series Satellite 3),
                            EMISAT/SPADEX?, Lemur-2 34-41, Max Valier Sat, Venta
                            1, 3-Diamonds Red/Green/Blue, QB50-IOD (InflateSail
                            (GB06), COMPASS 2 (DragSail-CubeSat, DE04)), QB50-S
                            (LituanicaSAT 2 (LT01), NUDTSat (CN06, BE06),
                            PEGASUS (AT03), UCLSat (GB03), URSA MAJOR (IT02),
                            VZLUsat 1 (CZ02)), SHERPA (3CAT1, Aalto  1, Arkyd 6,
                            Pathfinder 2, CANYVAL-X (Tom, Jerry), CAT 1, CNUSail
                            1, CORVUS BC, DIDO 1, eXCITe (PTB 1, SeeMee), FOX
                            1C/1D, ICE-Cap, ITASAT 1, KAUSAT 5, LMPC (AeroCube 
                            9), OCSD B/C (IOCPS), PROPCUBE, SIGMA (KHUSAT 3),   
                            ROBUSTA 1B, skCUBE, STEP Cube Lab, Suchai)

Gee, there's a ? next to it - maybe that means it's tentative?
« Last Edit: 06/09/2017 01:49 AM by sanman »

Online Steven Pietrobon

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Re: ISRO Orbital Rendezvous & Docking Experiment
« Reply #6 on: 06/09/2017 08:44 AM »
Gee, there's a ? next to it - maybe that means it's tentative?

I'm the author of that manifest. The question mark means I'm not sure if EMISAT/SPADEX is being carried on C38.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline vyoma

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Re: SPADEX - Space Docking Experiment (Orbital Rendezvous)
« Reply #7 on: 06/11/2017 12:49 AM »
ISRO has couple of research proposals for rendezvous and docking as part of their RESPOND program:

Rendezvous and docking (VSSC):
To achieve docking during the final phase of the mission, the relative position and velocity of the target spacecraft and chaser spacecraft has to be brought to zero. To ensure proper alignment of the docking port, the
relative angular orientation needs to be precisely aligned. Moreover, relative angular rate of the target and chaser are to be very close to zero for successful docking. Simultaneous control of the translational and rotational
dynamics is required to achieve the docking conditions.

High precision relative navigation and attitude reference system for space docking experiment (IISU)
Design, Development and Qualification of a Fully Autonomous Videometer based high precision relative navigation and attitude reference system for space docking experiment system consisting of retro reflectors,
illuminators, camera, complex image processing algorithms involving state observers, filtering algorithms, etc. for range, range rate, Line Of Sight (LOS), relative attitude determination.
« Last Edit: 06/11/2017 12:50 AM by vyoma »

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