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Chandrayaan-3 plans show failures in Chandrayaan-2 | India News



BENGALURU: The changes the Indian Space Research Organization (Isro) is making to the proposed Chandrayaan-3 mission are indicative of things that may have gone wrong with Chandrayaan-2, which failed to land the Moon's probe through September 2019.
From a new algorithm for targeting improved ground communication systems, the Review Committee, which met last Tuesday (November 12), outlined a number of recommendations made by the FAC on failure. of Chandrayan 2.
As part of the closing di The committee adopted the "Drive + Landing Module" configuration for Chandrayan-3 and said: "The targeting algorithm must be finalized, taking into account all FAC recommendations and also after detailed simulations."
TOI is the first to announce that the Chandrayan-3 mission is likely to have this ̵
1; a lander and rover (landing module) and a drive module – configuration on November 14th.
Problem with software and algorithm? One of the main reasons the FAC found the failure of the Chandrayaan-2 soft Vikram landing was a software and algorithm problem that saw the lander lose orientation only meters from the moon's surface. They said the speed of the lander was higher than expected and that there could be errors in attitude.
The review committee noted last week: "… In addition, after detailed simulations, an LDV (laser Doppler) sensor for direct measurement of speeds (all three axes) must be included. "The LDV sensor was even developed for the Chandrayaan-2, but since it does not perform well in ground tests, it is not included," says a source.
LDV sensors will be useful as they will help directly measure speeds of about 20 km, sources added, and said the Bengaluru-based LEOS lab under Isro has developed the sensor.
Direct Speed ​​Measurement
Among other things, Isro seeks to improve ground transfer capabilities for the new mission, which will help transfer lunar surface images from the landscape image camera from the outset to feeder descent – probably about 30 km from the moon's surface.
"The camera took pictures even of Chandrayan-2, but we were not able to transfer in real time. This time around, the commission thinks we need it to get the right orientation, "another source said.
The Committee noted: "… Data speed, telemetry and orientation must be appropriately achieved on the basis of the descent path."
Power and communication
It is also expected that Chandrayaan-3 will have solar cells on four sides of the lander – its predecessor had only three sides – to improve productivity.
"Possibility of replenishing solar cells on the fourth side vertical panel where Rover is housed to be investigated to avoid power problems if the landing occurs with a large position error resulting in the absence of the Sun on the plane, "the committee commented.
The Commission, which will meet again later this year, also instructed the subcommittees to consider setting margins for different interruption conditions. "Ground leveling, which must be taken into account … power and ground-to-ground communication to ensure after landing, regardless of the orientation of the lander," the panel noted.
Sources add that this may mean that the space agency will add more antennas on the ground to keep communication alive, even if the farm doesn't land on its feet.


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