The LAPAN Satellites are remote sensing satellite that will send satellite attitude data in real time mode and offline mode. The satellite attitude data is very important in a remote sensing satellite mission. For example, in the digital imager mission, operator use data attitude to take the image of targeted area with high accuracy. To make it easier for operators to control satellite attitude, they need a satellite simulator or satellite mock up that can show satellite attitudes in realtime or offline mode, especially in special missions. In addition, the dissemination division can also use the simulator to educate people about satellites. This paper discusses the working principle of the simulator and the structural design of the simulator. After the analysis, it is obtained that simulator uses the gimbal mechanism. The materials for the structure is 7075-T6 aluminum alloy. Meanwhile, the drive are three 17HS4401 stepper motor in each axis. The 17hs4401 stepper motor is strong enough to rotate all axes and the 7075-T6 aluminum alloy is strong enough and rigid to be used as a simulator structure.
LAPAN-A3/IPB operated in Nadir Pointing Mode as normal mode. Maneuvers are carried out to maintain attitude at nadir or to change satellite’s attitude to aim at the target in Target Pointing Mode. The attitude of the satellite when carry out the mission must be as close as possible to the target’s attitude parameter in order to get accurate and good quality satellite image. When the attitude of the satellite is not the same as the target, a difference will be created and this should be evaluated regularly. Historical data on satellite attitude differences and other satellite operating parameters are stored in a telemetry logfile data. There are two types of logfiles, logfile-client and logfile-server. So far, logfile-client is used to evaluate satellite operations, but the logfiles are vulnerable to formatting changes, so more reliable logfile is needed, the logfile-server is suitable because there are no changes in formatting. Logfile- servers are raw data telemetry that are issued directly from satellites without any data processing, so processing data directly from the logfile-server will produce more reliable results. This paper will discuss a method for evaluating satellite operations by processing raw data telemetry from the logfile-server. Using the method, based on March- August 2019 telemetry data, the attitude performance of LAPAN-A3/IPB satellite show positive trend. Yaw, pitch, and roll value, as attitude parameter, the majority are in the range of 0° until 1°.