Development of Thermal Control Systems for The Space-borne Optical Payload for New Possibilities and Opportunities for Nanosatellites Applications

Based on the many years of accumulated development experiences of space program, TelePIX has successfully developed Space-borne Optical Payload (SOP) for a 6U-class Nanosatellite platform. SOP consists of the Data Processing and Handling Unit (DPHU) which is used for the interface of telecommunication with the platform, and the Optical Head (OH) which is used for the image taking and processing.

SOP was designed to provide the image of PAN/MS 5.0 m resolution respectively with more than 50 SNR performance at a design altitude of 500 km despite of 3U sized and less than 4 kg. The thermal control systems for SOP was realized through a passive thermal control design, which was optimized based on various case studies to minimize power consumption of SOP. In addition, a derating review about major EEE parts used in SOP was conducted based on the part level thermal analysis of the electronics. Thermo-elastic analysis of the OH was also carried out by mapping the results of the thermal analysis onto the structural analysis model.

To evaluate thermal performance and integrity, and workmanship of the Flight Model (FM) under the acceptance level, we performed the thermal vacuum test combined by thermal vacuum cycling tests and thermal balance tests. The thermal vacuum cycling tests were completed without any issues. The evaluation of thermal analysis model for the SOP was performed by comparing the results with thermal balance test results in accordance with ECSS standard. After the correlation process, the deviations between the test and analysis results were satisfied the criteria.

Currently, we are waiting for the launch and LEOP activities scheduled in January/February 2025.

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