2023-05-28 15:35:28
6 out of 8 Nuriho satellites confirmed normal
Observation of next generation 2, cosmic radiation, etc. Toyosaat 3 ‘Dasol’ ejection unconfirmed Cube satellite ‘JAC’ also unknown
Among the eight practical satellites that went into space on the Korean launch vehicle ‘Nuri’, the next-generation small satellite No. 2, which is the main mounted satellite, succeeded in unfolding the visual radar (SAR) antenna. We are continuously trying to communicate with the 2 aircraft for which satellite reception has not been confirmed.
According to the Ministry of Science and ICT on the 27th, the module status, satellite attitude control function, body and sensor status of the next-generation small satellite 2 ejected from the Nuri were all confirmed to be normal.
The next-generation small satellite 2 observes Earth, space radiation, and space storms using a small domestic X-band SAR in a sun-synchronous orbit at an altitude of 550 km. From next week, basic function checks of the science mission payload (space radiation observer) and core technology payload (4 types including power amplifiers) will be performed.
Of the four Toyosaat siblings, which are auxiliary satellites, Unit 1 ‘Garam’ received a satellite signal on the 25th, the day of launch, and Unit 2 ‘Narae’ received a satellite signal on the morning of the 26th and conducted two-way communication. Unit 4 ‘Raon’ also succeeded in receiving the first satellite signal and status information from the Daejeon ground station of the Korea Astronomical Research Institute at 6:24 pm the previous day.
However, ‘Dasol’, unit 3, is still in a state where the beacon signal, which is a survival signal, is reduced unlike other satellites. A beacon signal refers to a unique radio signal periodically sent from a satellite to the ground.
In particular, Dasol has not been properly confirmed whether or not the Nuriho was ejected. Cheonmunyeon, which developed Toyosat, announced that it had not confirmed Dasol’s signal until the 27th, even though it posted the Toyosaat signal frequency on ‘SatNOGS’, a site where signal reception can be confirmed through ground station networks around the world.
Koh Jung-hwan, head of the Korean Launch Vehicle Advancement Project at the Korea Aerospace Research Institute, said in a post-launch briefing, “Cube satellites (micro satellites) are not electrically connected to the launch vehicle, so they only receive information on whether the launch tube is open or closed.” This strange data is mixed,” he said.
It is difficult to confirm the ejection with a video because the Toyosaat 3 ejection site is a blind spot for the camera mounted on the third stage of the Nuri. Hang Woo-yeon explained, “If we analyze the measurement data of the third stage of the Nuri, we can confirm whether it was ejected or not, but it will take time.”
It is possible that the ejection was done correctly, but the signal was not picked up yet. This is because, unlike large satellites, cube satellites often take more than a week to know the result of communication. In fact, among the four university cube satellites that were loaded at the time of the second Nuri-ho launch, Yonsei University’s ‘Meman’ made contact 48 days following launch.
Dasol may not be able to properly control his posture yet. Beacon signals must be sent in the direction of the earth to receive the signal, but if the posture is unstable, radio waves are mainly sent to space, not to the earth.
Among the three cube satellites developed by the industry and loaded together, the Lumir satellite detected a beacon signal on the day of launch, and two-way communication was carried out on the Cairo Space satellite at around 2:40 pm on the 26th. Justek’s JAC is still not picking up survival signals. JAC weighs 3.2 kg, which is smaller than the missing Dasol.
reporter useful
1685304096
#Nextgeneration #small #satellite #antenna #unfolded #Signal #Unconfirmed #2nd #Communication #Attempt
