General > General Technical Chat

Japan's ispace reveals "HAKUTO-R" Mission 1 Lunar Landing crash results

<< < (3/5) > >>

tszaboo:

--- Quote from: SiliconWizard on May 29, 2023, 04:12:43 am ---Well, from what I can tell, this is not a software bug, but an overlook while specifying - and testing - it.
One of the most common causes of malfunctions with software-based systems. Assuming the conditions they will run under are limited to the very few that have been thought about in some office, for probably not long enough.

--- End quote ---
Yeah, they should have specified:
Make it not crash. :-//

RoGeorge:

--- Quote from: floobydust on May 27, 2023, 10:28:10 pm ---The most likely reason for the lander’s incorrect altitude estimation was that the software did not perform as expected. Based on the review of the flight data, it was observed that, as the lander was navigating to the planned landing site, the altitude measured by the onboard sensors rose sharply when it passed over a large cliff approximately 3 kms in elevation on the lunar surface, which was determined to be the rim of a crater. According to the analysis of the flight data, a larger-than-expected discrepancy occurred between the measured altitude value and the estimated altitude value set in advance. The onboard software determined in error that the cause of this discrepancy was an abnormal value reported by the sensor, and thereafter the altitude data measured by the sensor was intercepted. This filter function, designed to reject an altitude measurement having a large gap from the lander’s estimation, was included as a robust measure to maintain stable operation of the lander in the event of a hardware issue including an incorrect altitude measurement by the sensor.

--- End quote ---

 :-\

coppercone2:
Well until they get air traffic control up there on the ground like at an air port you won't have spectacular landing success %

you need beacons, redundant systems, local ground control, etc.

IMO the whole situation is totally ass backwards until they get a lunar port up and running. I bet a lit landing zone would do real nice too, with flashing lights. I don't think we will ever have "good" expectations for remote probes.

RoGeorge:

--- Quote from: coppercone2 on May 29, 2023, 08:45:11 am ---you need beacons

--- End quote ---

That's  a good idea.  Beacons would be easy to set, IMO, certainly easier than landing a big vessel.  Beacons with unique ID can be dropped at random on the Moon surface, so the beacons can be read/update their location from the Moon orbit, or they can determine their position relative to each other.

The beacons doesn't have to work 24/7, can be activated remotely only when needed.  There are nuclear batteries that can last for hundreds to thousands of years.

Might be also useful to set a few GPS satellites orbiting the Moon.

tszaboo:
I think Lockheed Martin wants to make a lunar GPS with a few satellites. Something like 6. Plus they would be communication relays.
Plus ESA wants to make one as well.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod