Deleted
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Post by Deleted on Oct 20, 2016 6:51:47 GMT 7
There are growing fears a European probe that attempted to land on Mars on Wednesday has been lost. Tracking of the Schiaparelli robot's radio signals was dropped less than a minute before it was expected to touch down on the Red Planet's surface. Satellites at Mars have attempted to shed light on the probe's status, so far without success. One American satellite even called out to Schiaparelli to try to get it to respond. The fear will be that the robot has crashed and been destroyed. The European Space Agency, however, is a long way from formally calling that outcome. Its engineers will be running through "fault trees" seeking to figure out why communication was lost and what they can do next to retrieve the situation. This approach could well last several days. Jump www.bbc.com/news/science-environment-37707776
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rubl
Crazy Mango Extraordinaire
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Post by rubl on Nov 11, 2016 10:00:09 GMT 7
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rubl
Crazy Mango Extraordinaire
The wondering type
Posts: 23,997
Likes: 9,333
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Post by rubl on Nov 24, 2016 12:12:01 GMT 7
At ESA there's still busy investigating the data they received, but it looks like the problem gets clearer "As Schiaparelli descended under its parachute, its radar Doppler altimeter functioned correctly and the measurements were included in the guidance, navigation and control system. However, saturation – maximum measurement – of the Inertial Measurement Unit (IMU) had occurred shortly after the parachute deployment. The IMU measures the rotation rates of the vehicle. Its output was generally as predicted except for this event, which persisted for about one second – longer than would be expected. When merged into the navigation system, the erroneous information generated an estimated altitude that was negative – that is, below ground level. This in turn successively triggered a premature release of the parachute and the backshell, a brief firing of the braking thrusters and finally activation of the on-ground systems as if Schiaparelli had already landed. In reality, the vehicle was still at an altitude of around 3.7 km. This behaviour has been clearly reproduced in computer simulations of the control system’s response to the erroneous information." www.esa.int/Our_Activities/Space_Science/ExoMars/Schiaparelli_landing_investigation_makes_progress
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