The design of the tri-axial magnetometer utilises Anisotropic Magneto-Resistance (AMR). The sensors are implemented as ceramic packages and co-located with drive electronics in a potted sensor head – ideally at the end of a rigid boom. Closed loop control improves the overall linearity and limits sensitivity drift.
The MR driver ensures the sensor maintains low noise operation by holding the sensor at its optimum position on the sensor transfer function. The sensors delivers the three components of the magnetics field plus a temperature measurement.
In CubeSat applications the magnetometer requires an electronics mezzanine card one third the area of a standard CubeSat PCB. The sensors connects to the mezzanine via a lightweight harness. Power requirements are one digital (3.3 or 5V) and one analogue (12V-15V) line. A digital serial interface can be included if required. In microsat applications, the additional electronics is integrated with the sensor head resulting in a very compact unit that is simple to accommodate.