NASA Fixes Iconic Hubble Space Telescope and Brings It Back Online

 


After what appeared to be a memory error, the Hubble Space Telescope has been in "safe mode" for more than a month. NASA tried every common fix, like turning it off and on, but the old observatory would not come back online. After exploring the issue, NASA followed the inability to power up the Science Instrument Order and Information Taking Care of module. On (July 15), the team made the announcement that it was beginning a process to switch to the backup data handling module, which could take several days. NASA, on the other hand, claims that Hubble is currently operational. 


On July 13, when Hubble payload computer stopped working, the problems started. Since this is distinct from the main computer on the spacecraft, NASA has not lost communication. However, the science instruments on Hubble are controlled and coordinated by the payload computer. Hubble has no reason to continue its operations without it. The main computer put Hubble into safe mode when the payload computer failed, and for the next month, little changed. 


At first, NASA engineers thought the issue was related to the payload computer's memory modules. The team made an unsuccessful attempt to substitute one of the four spare memory chips. NASA now suggests that the problem most likely exists at a higher level. During Hubble's final servicing mission in 2009, astronauts replaced the Science Instrument Command and Data Handling (SI C&DH) unit, which includes the payload computer. NASA has been persuaded by the information gathered over the past few weeks that the SI C&DH's Power Control Unit (PCU) is the source of the problem. Sadly, ground commands were unable to reset the PSU for NASA


Hubble, like most expensive space hardware, was designed with a lot of redundant systems. NASA decided to switch to the backup side of the SI C&DH, which has its own components that are not connected to the ones that are failing because the SI C&DH is a two-sided computer. NASA successfully switched on the backup system and installed flight software on it. Alternate interfaces were used to connect a number of other components to the backup payload computer. The team is hopeful that it will soon be able to recover all the instruments from safe mode, as everything is going well so far. The telescope can then resume science operations with just a little calibration. 


In recent years, NASA has had to rely on backup hardware to keep the telescope working, but it is running out of backups. Hubble is nearing the end of its useful life after 30 years. It has already been around for a lot longer than anyone expected, and if all goes well, it will be in the same sky as the James Webb Space Telescope. Webb is expected to go live before the end of 2021. Unless it experiences yet another delay, which would not be unexpected at this point


From there, the team proceeded meticulously and methodically. Over the next two weeks, more than 50 people worked to review, update, and test the procedures for switching to back up hardware. They also held a formal review of the plan that was proposed and tested it on a high-fidelity simulator. 


The team simultaneously looked over the results of their earlier tests and found that the power control unit might be to blame for the problem. They switched the Science Instrument and Command and Data Handling unit's backup side, which houses the backup Power Control Unit, on July 15 as planned

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