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Aerospace

CAN on Mars

After seven month, the Trace Gas Orbiter (TGO) of ESA's Exomars 2016 has reached the Red Planet. Contact with the mission’s test lander from the surface has not yet been confirmed.

Exomars 2016 TGO enters orbit (Photo: ESA/ATG medialab)

The successful launch of Exomars 2016 was the first step towards bringing CAN to the Red Planet. TGO's Mars orbit Insertion burn lasted from 13:05 to 15:24 UTC on 19 October, reducing the spacecraft's speed and direction by more than 1,5 km/s. The TGO is now on its planned orbit around Mars. European Space Agency teams at the European Space Operations Centre (ESOC) in Darmstadt, Germany, continue to monitor the good health of their second orbiter around Mars, which joins the 13-year old Mars Express. The ESOC teams are trying to confirm contact with the Entry, Descent and Landing Demonstrator Module (EDM), Schiaparelli, which entered the Martian atmosphere some 107 minutes after TGO started its own orbit insertion maneuver. Both parts of the Exomars satellite, the TGO as well as the EDL demonstrator, are using embedded CAN networks. Thalis Alenia Space (France) has developed the modules. In the CAN conference organized by ESA, which took place a few days before the Exomars launch, the company presented some details about the CAN communication. It makes use of the CANopen IP Core developed by Sitael. The physical layer is based on EIA 485 variant due to the fact that there were no rad-hard transceivers available when the development was started. For the second part of the Mars mission, it is planned to implement rad-tolerant CAN transceivers.

The 577-kg EDM was released by the TGO at 14:42 UTC on 16 October. Schiaparelli was programmed to autonomously perform an automated landing sequence, with parachute deployment and front heat shield release between 11 km and 7 km. This was followed by a retrorocket braking starting at 1100 m from the ground, and a final fall from a height of 2 m protected by a crushable structure. Prior to atmospheric entry at 14:42 UTC, contact via the Giant Metrewave Radio Telescope (GMRT), the world's largest interferometric array, located near Pune, India, was established just after it began transmitting a beacon signal 75 minutes before reaching the upper layers of the Martian atmosphere. However, the signal was lost some time prior to landing.

A series of windows have been programmed to listen for signals coming from the lander via ESA'S Mars Express and NASA's Mars Reconnaissance Orbiter (MRO) and Mars Atmosphere and Volatile Evolution (MAVEN) probes. The Giant Metrewave Radio Telescope (GMRT) also has listening slots. If Schiaparelli reached the surface safely, its batteries should be able to support operations for three to ten days, offering multiple opportunities to re-establish a communication link. TGO is equipped with a suite of science instruments in order to study the Martian environment from orbit. Although mostly a technology demonstrator, Schiaparelli is also carrying a small science payload to perform some observations from ground.

Exomars 2016 is the first part of a two-fold international endeavor conducted by ESA in cooperation with Roskosmos in Russia that will also encompass the Exomars 2020 mission. Due in 2020, the second Exomars mission will include a Russian lander and a European rover, which will drill down to 2 m underground to look for pristine organic material. CAN networks are also used in other aerospace projects. Chipmakers provide radiation-resistant CAN transceivers and FPGAs.

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Publish date
2016-10-20
Company

ESA

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