Quantum diamond magnetometry for navigation in GNSS denied environments

Satellite-based navigation has been a transformational technology that underpins almost all aspects of modern life. However, there are environments where global navigation satellite systems (GNSS) are not available, for example undersea or underground, and navigation that is robust to GNSS outages are also required for resilient systems.  In this context, we are exploring the potential for quantum diamond magnetometers to be used as aids for inertial measurement units for navigation in GNSS-denied environments.  We perform simulations of the magnetic field measurements combined with probabilistic data association for data mapping; and probabilistic multiple hypotheses (or Viterbi) map matching filters.  These methods are used to explore the expected navigation errors available to scalar and vector magnetometry with diamond at the sensitivities available using current and expected near-term devices.  Here we show some of our preliminary results as well as providing a broader overview of diamond as a quantum magnetometery.