**4. Example of magnetometer applications for small satellite missions**

This section presents the attitude control system of the remote sensing nano-satellite PRISM and micro astronomy satellite Nano-JAMSINE to show examples of the application of magnetometers for nano- and micro-satellite missions. PRISM has three-axis low power consumption magneto-impedance sensor. The magnetometer measurements are used for the attitude estimation and an MTQ is used for attitude control. After completing the main mission, the satellite conducted an in-orbit experiment to demonstrate magnetic moment compensation. Nano-JASMINE has two types of magnetic sensors, a three-axis magnetoresistive magnetometer and a three-axis fluxgate magnetometer. The satellite attitude should be stabilized to within 1 arcsec during observation. In order to satisfy this requirement, the satellite should estimate the magnetic moment and compensate precisely. The fluxgate magnetometer is used for this purpose. The satellite also uses a magnetometer for attitude estimation and magnetic attitude control in initial phase, when the power consumption is limited. A low power consumption magneto-resistive magnetometer is used for this initial phase in this satellite mission. The following subsections show detailed magnetometer application for nano- and micro-satellites with in-orbit data and simulation results.
