Maneuver Strategy for Increasing Multispectral Imager Temperature on LAPAN A3/IPB Microsatellite

Abstract

During the day of LAPAN A3 operation, the temperature of the multispectral Imager or LISA (Line Imager Space Applications), does not stay continually at the positive value, especially during May - June 2017 and 2018. Based on the beta angle variation, May and June have a minimum beta angle condition that affects LISA temperature. However, there are two procedures we perform for maintaining LISA temperature, both are the stop-release and the stop-release with additional roll angle. The idea in the stop-release maneuver is stopping the satellite for orbiting in nadir pointing mode, by giving 0°/s of nadir rate or 0° of pitch angle, at specific latitude. After a certain duration, the satellite should be release into nadir pointing back at the same specific latitude. This method has a purpose to point some satellite side to the sun for the increasing temperature of the multispectral Imager. Meanwhile, the second method is giving roll angle before the satellite executes the stop maneuver. Before the release maneuver, the attitude must be fixed back by giving a negative value of roll angle. Based on the result, the stop-release maneuver could increase the LISA temperature when it executes at 200 of latitude in ascending orbit condition. Therefore, the additional roll angle in the stop-release maneuver could increase the LISA temperature better than only use a normal stop-release.