Author Topic: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)  (Read 73834 times)

Offline Rondaz

  • Senior Member
  • *****
  • Posts: 24493
  • Liked: 4642
  • Likes Given: 163
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #280 on: 07/06/2022 04:24 pm »
CAPSTONE Update: Communications Re-Established

Sarah Frazier Posted on July 6, 2022 11:30 am

Mission operators have re-established contact with NASA’s  Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment (CAPSTONE) spacecraft. Additional updates will be provided.

https://blogs.nasa.gov/artemis/2022/07/06/capstone-update-communications-re-established/

Offline FutureSpaceTourist

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 27513
  • UK
    • Plan 28
  • Liked: 51222
  • Likes Given: 21751
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #281 on: 07/06/2022 06:00 pm »
https://twitter.com/planet4589/status/1544740391899070467

Quote
CAPSTONE is now passing the orbit of the Moon on the way out towards Lagrange SEL1

Offline dsmillman

  • Member
  • Full Member
  • ****
  • Posts: 1457
  • Liked: 297
  • Likes Given: 14
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #282 on: 07/06/2022 08:12 pm »
From the DSN status at Goldstone:

SPACECRAFT NAME
CAPSTONE

RANGE
-

ROUND-TRIP LIGHT TIME
-

ANTENNA
NAME
DSS 24

AZIMUTH
150.90 deg

ELEVATION
68.80 deg

WIND SPEED
16.67 km/hr

MODE
-

UP SIGNAL
SOURCE
CAPSTONE

TYPE
DATA

DATA RATE
4.00 kb/sec

FREQUENCY
7.20 GHz

POWER TRANSMITTED
0.96 kW

DOWN SIGNAL
SOURCE
CAPSTONE

TYPE
DATA

DATA RATE
260.40 kb/sec

FREQUENCY
8.46 GHz

POWER RECEIVED
-114.22 dBm
(3.78 x 10-18 kW)

Offline FutureSpaceTourist

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 27513
  • UK
    • Plan 28
  • Liked: 51222
  • Likes Given: 21751
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #283 on: 07/06/2022 09:42 pm »
https://blogs.nasa.gov/artemis/2022/07/06/following-communications-recovery-nasas-capstone-prepares-for-first-maneuver/

Quote
Following Communications Recovery, NASA’s CAPSTONE Prepares for First Maneuver

Following communications issues, mission teams for NASA’s Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment (CAPSTONE) have re-established contact with the spacecraft through NASA’s Deep Space Network. Data received from CAPSTONE shows that the spacecraft is in good health and operated safely on its own while it was out of contact with Earth.

Teams are preparing to carry out CAPSTONE’s first trajectory correction maneuver – which will more precisely target CAPSTONE’s transfer orbit to the Moon – as early as 11:30 a.m. EDT on July 7. As originally planned, CAPSTONE will arrive to its lunar orbit on Nov. 13. 

The CAPSTONE team is still actively working to fully establish the root cause of the issue. Ground-based testing suggests the issue was triggered during commissioning activities of the communications system. The team will continue to evaluate the data leading up to the communications issue and monitor CAPSTONE’s status.

The mission team, led by Advanced Space, initially re-established contact with CAPSTONE at 9:26 a.m. EDT on July 6. The signal confirmed that CAPSTONE was in the expected location, as predicted based on data from CAPSTONE’s initial contacts on July 4. The team started recovery procedures and began receiving telemetry data from the spacecraft at 10:18 a.m. EDT.   

Author Sarah Frazier
Posted on July 6, 2022 5:36 pm

Image caption:

Quote
A data visualization shows the antenna of the Deep Space Network. CAPSTONE is communicating with one of the Goldstone antenna.

Offline FutureSpaceTourist

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 27513
  • UK
    • Plan 28
  • Liked: 51222
  • Likes Given: 21751
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #284 on: 07/06/2022 11:10 pm »
https://twitter.com/peter_j_beck/status/1544820925559844864

Quote
Just dropped into mission control to check on Lunar Photon. We just past the moon and are now at 390,000km

Offline yg1968

  • Senior Member
  • *****
  • Posts: 15305
  • Liked: 5748
  • Likes Given: 2549
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #285 on: 07/07/2022 12:37 pm »
https://twitter.com/AdvancedSpace/status/1544799348415946753

Quote from: Advanced Space
Through the work over the last day, the team has high confidence that the issue has been cleared and through changes to the configuration and operations it will not happen again. As we finalize the review of this root cause analysis with appropriate parties, we will release more information.

Online redliox

  • Senior Member
  • *****
  • Posts: 2389
  • Arizona USA
  • Liked: 607
  • Likes Given: 90
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #286 on: 07/07/2022 01:42 pm »
Phew!  I was afraid 'Cap was going to be a mini-Lunar-variant of the Mars Observer!  :o  Hopefully rest of it's mission will be graceful after this pothole in the road.
"Let the trails lead where they may, I will follow."
-Tigatron

Offline Rondaz

  • Senior Member
  • *****
  • Posts: 24493
  • Liked: 4642
  • Likes Given: 163
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #287 on: 07/07/2022 01:50 pm »
Photon Curie burn 7 is for a secondary mission independent of CAPSTONE's trip to the moon..

https://twitter.com/planet4589/status/1545033871728807937

Offline Rondaz

  • Senior Member
  • *****
  • Posts: 24493
  • Liked: 4642
  • Likes Given: 163
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #288 on: 07/07/2022 02:11 pm »
NASA's CAPSTONE satellite has restored its communications, but the root cause of the communications malfunction remains under investigation. Article Credit: SpaceNews..

https://twitter.com/SpaceIntellige3/status/1545044663957987338

Offline FutureSpaceTourist

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 27513
  • UK
    • Plan 28
  • Liked: 51222
  • Likes Given: 21751
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #289 on: 07/07/2022 05:24 pm »
https://blogs.nasa.gov/artemis/2022/07/07/mission-team-determines-cause-of-communications-issues-for-nasas-capstone/

Quote
Mission Team Determines Cause of Communications Issues for NASA’s CAPSTONE

After a thorough review, teams have determined what led to CAPSTONE’s communications issue that began on July 4. 

During commissioning of NASA’s CAPSTONE (short for Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment) spacecraft, the Deep Space Network team noted inconsistent ranging data. While investigating this, the spacecraft operations team attempted to access diagnostic data on the spacecraft’s radio and sent an improperly formatted command that made the radio inoperable. The spacecraft fault detection system should have immediately rebooted the radio but did not because of a fault in the spacecraft flight software.

CAPSTONE’s autonomous flight software system eventually cleared the fault and brought the spacecraft back into communication with the ground, allowing the team to implement recovery procedures and begin commanding the spacecraft again. 

While CAPSTONE was out of contact with Earth, the spacecraft autonomously maintained its orientation to keep its antenna pointed towards Earth and allow the solar panels to keep its battery charged. CAPSTONE also used its thrusters to perform a standard maneuver to dump excess momentum from its reaction wheels, which are internal wheels that help the spacecraft rotate and point itself. 

The mission operations team conducted CAPSTONE’s first trajectory correction maneuver at approximately 11:30 a.m. EDT today. Teams are currently reviewing the data to ensure the maneuver was successful, and an update will be provided later. This maneuver will more precisely target the spacecraft’s transfer orbit to the Moon.

Author Sarah Frazier
Posted on July 7, 2022 1:18 pm
Categories Uncategorized
Tags CAPSTONE, Cubesats, Gateway, Moon

Offline yg1968

  • Senior Member
  • *****
  • Posts: 15305
  • Liked: 5748
  • Likes Given: 2549

Offline yg1968

  • Senior Member
  • *****
  • Posts: 15305
  • Liked: 5748
  • Likes Given: 2549

Offline Conexion Espacial

  • Full Member
  • ****
  • Posts: 1718
  • Liked: 2301
  • Likes Given: 1701
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #292 on: 07/08/2022 12:32 am »


NASA’s CAPSTONE Pulls Off First Targeting Maneuver on Journey to the Moon


NASA’s CAPSTONE successfully completed its first trajectory correction maneuver, which started at 11:30 a.m. EDT Thursday. This is the first in a series of thruster burns over the next few months to more accurately target CAPSTONE’s transfer orbit to the Moon. The maneuver lasted just over 11 minutes and changed the spacecraft’s velocity by about 45 miles per hour (about 20 meters per second). CAPSTONE’s next trajectory correction maneuver is targeted for Saturday, July 9. 


CAPSTONE is now about 289,000 miles from Earth, beyond the orbit of the Moon. CAPSTONE will loop back around and arrive to its lunar orbit – called a near rectilinear halo orbit, or NRHO – Nov. 13. CAPSTONE will fly in the NRHO for at least six months to study the dynamics of the orbit, which is the same one intended for Gateway, a lunar space station for science and human exploration under Artemis. 


Two technology demonstrations on CAPSTONE could allow future spacecraft to navigate near the Moon without as much tracking required from Earth.
I publish information in Spanish about space and rockets.
https://twitter.com/conexionspacial

Offline yg1968

  • Senior Member
  • *****
  • Posts: 15305
  • Liked: 5748
  • Likes Given: 2549

Online Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31475
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19699
  • Likes Given: 3248
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #294 on: 07/08/2022 06:42 am »
While investigating this, the spacecraft operations team attempted to access diagnostic data on the spacecraft’s radio and sent an improperly formatted command that made the radio inoperable. The spacecraft fault detection system should have immediately rebooted the radio but did not because of a fault in the spacecraft flight software.

Great to hear they found the cause of the problem. Standard practise is to always verify any commands to be sent on a model of the spacecraft, before you send the commands. Sounds like this wasn't done properly.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline jimvela

  • Member
  • Full Member
  • ****
  • Posts: 1422
  • Liked: 436
  • Likes Given: 18
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #295 on: 07/08/2022 12:23 pm »
Great to hear they found the cause of the problem. Standard practise is to always verify any commands to be sent on a model of the spacecraft, before you send the commands. Sounds like this wasn't done properly.

Note: I have no direct knowledge of the CAPSTONE mission. 

It sounds like they may have sent a debug or other special command to the radio.  It's possible that there is a "generic" command for the avionics to communicate with a complex subsystem (in this case the IRIS radio.)  In other missions that I've worked on, a supplier has revealed additional commanding or telemetry from such a subsystem when in flight and having something go funny (in this case, odd behavior in the ranging data that DSN was seeing.)  Having such a generic commanding capability is a double edged sword- very powerful and very dangerous.

One of the really big dangers in mission operations is sending such a command in near-real time without good verification.

In my own experience, missions would have have sent that command on a testbed (usually a flatsat) BEFORE doing it in flight.   

I wonder if there is a high fidelity hardware in the loop simulator available for this mission where that might have been caught.

Also interesting and perhaps more disturbing to me is that when the faulty commanding took the radio offline, the expectation was that onboard fault protection would have immediately rebooted the radio.  That didn't happen, and the release mentions that a different FSW defect prevented that from happening.  That's also a bad day- and likely a further test/verification (shortcoming) failure.  Perhaps they then spent time commanding in the blind and perhaps waiting/hoping that additional fault protection would fire and restore radio operation- which is what appears to have happened. 

I can sympathize- this kind of verification is really hard to do with full coverage- especially if you have a very complicated and dynamic subsystem where not every conceivable command may even be known in advance.   

Offline ccdengr

  • Full Member
  • ****
  • Posts: 506
  • Liked: 363
  • Likes Given: 58
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #296 on: 07/08/2022 03:26 pm »
Perhaps they then spent time commanding in the blind and perhaps waiting/hoping that additional fault protection would fire and restore radio operation- which is what appears to have happened.
Based on the timeline and what we saw on DSN Now, they did a ton of blind commanding, got nothing, and then got it back 1-2 days later.  Sounds like a command loss timer expiration to me.

Glad it worked.  I've been doing spacecraft software for decades and I can sympathize completely with how they must have felt just after sending that bad command...

Offline JayWee

  • Full Member
  • ****
  • Posts: 759
  • Liked: 702
  • Likes Given: 1138
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #297 on: 07/08/2022 03:59 pm »
...
In my own experience, missions would have have sent that command on a testbed (usually a flatsat) BEFORE doing it in flight.   
I wonder if there is a high fidelity hardware in the loop simulator available for this mission where that might have been caught.
...
Is this a standard for a cheap cubesat tho? The entire mission seems to be $16M. Half of that might have went to RocketLab.

Offline ccdengr

  • Full Member
  • ****
  • Posts: 506
  • Liked: 363
  • Likes Given: 58
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #298 on: 07/08/2022 04:08 pm »
Is a [high fidelity hardware in the loop simulator] a standard for a cheap cubesat tho?
Depends on your definition of high-fidelity, but I wouldn't try to do anything at any price without some kind of a flatsat for testing.  But there could have been fidelity issues from cost-cutting, sure.

Offline Overwatchfan123

  • Full Member
  • **
  • Posts: 266
  • United Kingdom
    • My YouTube channel
  • Liked: 99
  • Likes Given: 62
Re: Electron : CAPSTONE : LC-1 : 28 June 2022 (09:55 UTC)
« Reply #299 on: 07/08/2022 04:09 pm »
By the way, why does it take four months for CAPSTONE to get to the moon instead of four days like the Apollo missions?
I've been a space aficionado since 2008. I love space.
Check out my YouTube channel here: https://www.youtube.com/c/DarkFalconAnimations

Tags:
 

Advertisement NovaTech
Advertisement SkyTale Software GmbH
Advertisement Northrop Grumman
Advertisement
Advertisement Brady Kenniston
Advertisement NextSpaceflight
Advertisement Nathan Barker Photography
0