Summary

Ideally mounted outside the spacecraft at the end of a rigid boom, the NewSpace Systems NMRM-Bn25o485 magnetometer includes low noise, precision processing and analogue-to-digital conversion circuitry; all of which improves the linearity and reduces the drift sensitivity of the sensor head. The integrated processing circuitry and sensor head provides the mission an accurate and stable magnetic field measurement at low power consumption. The power requirement is a regulated 5 V DC supply while the measured x-, y- and z-axes magnetic field components are available as 0 - 5 V analogue outputs or optionally on a digital serial interface.

The design of the tri-axial magnetometer uses Anisotropic Magneto-Resistive (AMR) sensors which are co-located with offset compensating circuitry. The offset compensating circuitry nulls the characteristic offset voltage of the AMR sensor and enhances the sensors performance. The sensor provides x-, y- and z-axes magnetic field component measurements, as well as a sensor temperature measurement which is used for the temperature compensation of the magnetic field measurement.

Developed in collaboration with the Space and Atmospheric Physics Group of Imperial College London; the sensor head first flew on the CINEMA mission and then as an integrated unit in July 2014. Since then, 50 of these units have been delivered to a variety of international missions and constellation programmes. As such, this unit is TRL 9 with extensive in-orbit heritage.

Key features of the NMRM-Bn25o485 magnetometer include:

  • Small size and low mass
  • Flexible interface options
  • Radiation tolerant COTS
  • Supplied with calibration matrix

Applications of the NMRM-Bn25o485 magnetometer include the following:

  • Can be used for the calculation of magnetorquer rods control torque levels
  • Attitude determination sensor when used with an IGRF reference model
  • Angular rate determination sensor by comparing successive measurements

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Last updated: 2021-09-07

NMRM-Bn25o485 Magnetometer

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Specs

9TRL
mass
< 85 g
length
99 mm
width
43 mm
height
17 mm
orthogonality
< ±1 deg
measurement range
-60000 to 60000 nT
resolution
< 8 nT
update rate
< 18 Hz
magnetic field noise density
<16 nT rms/Hz @ 1 Hz
power consumption
< 750 mW
power supply
5 V DC
thermal (acceptance)
-25 to 70 C
data interface
RS485
connector type
9-pin Female Micro-D
mechanical vibration
17.25 gRMS (random)
radiation tolerance
10 krad

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