The GaAs deployable solar array for SAC-B

Autonomous system clock frequency controller for pico- and nano- satellites

“…One is to improve the input power and the other is to reduce the power usage without reducing the satellite performance. There were some research works aimed to improve the input power to the satellites through deployable solar panels [14][15][16][17][18], optimization of power gain [19][20][21][22][23][24][25][26][27][28][29], and optimization of the satellite's orbit path [30].…”

“…Therefore, from (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21), the additional background tasks' execution time margin + ! + -.…”

“…Combining with (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) and (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17), (3-43) can be expanded as…”

“…To obtain U , as shown in , , 9 , and which represent the foreground tasks' states, the time-dependent background tasks' states, and the actual system clock frequency respectively, must be obtained from the flight software. Then, as shown in (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22), to obtain $ QJRS T , G H O/ 9 , which is the left-over eventdependent background tasks' number of execution must be also be known from the flight software. Thus, by providing , 9 , , and G H O/ 9 parameters to the time estimator, ^_`7 can be calculated.…”

“…Once those required parameters are known, ^_`7 can be calculated based on (3-41) and Y Z based on (3-42). The two elements of ^_`7 ,U and $ QJRS T , can be obtained from to and(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) respectively. 9 , !…”