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Home / Science / Chandrayaan-3 plans indicate a failure of Chandrayaan-2 | India news

Chandrayaan-3 plans indicate a failure of Chandrayaan-2 | India news



BENGALURU: The changes being made to the planned Chandrayaan 3 mission by the Indian Space Research Organization (Isro) are an indication of the problems with Chandrayaan-2, which did not manage to probe the Moon in September soft landing in 2019.
A new guidance algorithm on improved lander-based communication systems has been referenced by the summary committee meeting last Tuesday (12 November) for recommendations issued by the FAC to investigate Chandrayaan-2. Error were pronounced.
During the closing discussions of the meeting, the committee accepted the configuration "Propulsion + Landing Module" for Chandrayaan-3 and said, "The guiding algorithm must be completed taking into account all FAC recommendations and detailed simulations."
Das TOI is the first company to report that the Chandrayaan 3 mission is expected to have this configuration ̵
1; Lander & Rover (Landing Module) and propulsion module – on Nov. 14 One of the main reasons for the failure of Chandrayaan-2 in the soft landing of Vikram ( the lander) was a flaw in the software and algorithm used by Lander to lose orientation only a few meters from the lunar surface. They said that the speed of the lander was higher than expected and that it might have failed settings.
The Review Committee noted last week: "… Even after detailed simulations, an LDV (Laser Doppler Velocity) sensor needs to be built in to directly measure velocities (all three axes). "The LDV sensor was even developed for Chandrayaan-2, but it was not included as it does not work well on ground testing," sources said.
LDV sensors will be useful as they help direct the measurement of speed from a height of about 20 km, sources added, and Bengaluru-based LEOS Lab under Isro developed the sensor.
Direct Speed ​​Measurement
Among other things, Isro wants to improve data transmission on the lander for the new mission in order to assist the transmission of lunar surface images from the Lander-Imager camera from the beginning of descent – probably about 30 km from the lunar surface ,
"The camera even took pictures on Chandrayaan-2, but this time we did not have the ability to transfer real-time, which the Committee believes is necessary to get it right," another source said.
The committee noted: "… data rate, telemetry and orientation must be adequately determined based on the descent curve."
Energy and Communications
Chandrayaan-3 is also said to contain solar cells on four sides of the lander – its predecessor had it only on three sides – to improve its performance.
"Feasibility of mounting solar cells on the fourth vertical side plate on which Rover is housed to avoid energy problems when landing with large attitude errors resulting in the absence of the sun in the aircraft," said the committee.
The panel, meeting again later this year, has also mandated subcommittees to address margins for various placement conditions. "Strengthening the lander should be considered … Power and communication between the lander and the ground must be ensured after landing, regardless of the orientation of the lander," the panel noted.
Sources added that this could mean that the space agency will be installing more antennas on the lander to keep the communication alive, even if the lander does not land.


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