A new quantum sensing technology tested by NASA could offer an alternative to satellite-based navigation systems, potentially reducing reliance on GPS. The device, a compact diamond-based magnetometer, is designed to map Earth’s magnetic field with high precision and may support navigation across land, air, and sea even when GPS signals are unavailable.
The sensor is being developed by SBQuantum and is scheduled for launch aboard a SpaceX rideshare mission. The project is part of the MagQuest Challenge, an initiative led by the National Geospatial-Intelligence Agency to identify next-generation technologies capable of replacing aging magnetic field monitoring satellites, according to SpaceNews.
Current navigation systems rely heavily on the World Magnetic Model, a global representation of Earth’s magnetic field used by defense agencies, aviation authorities, and consumer technologies. This model requires continuous updates because the planet’s magnetic field shifts over time. Existing satellite infrastructure used to collect this data is nearing the end of its operational lifespan, prompting efforts to develop more efficient and resilient alternatives.
SBQuantum’s solution uses a quantum diamond magnetometer, a sensor that detects magnetic fields by measuring changes at the atomic level within specially engineered diamond materials. Unlike traditional systems, which can be large and require periodic measurements, the new device is significantly smaller and capable of continuous, high-resolution data collection.
The sensor has undergone testing at NASA’s Goddard Space Flight Center to validate its performance under extreme conditions. Its compact size, roughly comparable to a small container, allows for easier deployment on satellites and other platforms, including unmanned systems.
A key advantage of magnetic-based navigation is its independence from external signals. Unlike GPS, which can be disrupted, jammed, or spoofed, magnetic navigation relies on natural variations in Earth’s field. This makes it particularly relevant for defense and security applications, where maintaining reliable positioning data is critical.
The technology also has potential applications beyond navigation. These include resource exploration, environmental monitoring, and public safety operations. By providing more precise and continuous measurements of magnetic fields, the system could improve mapping accuracy and support scientific research.
SBQuantum is collaborating with Spire Global to deploy the sensor in orbit, leveraging existing satellite infrastructure and data processing capabilities. The mission will contribute to the final phase of the MagQuest Challenge, with results expected to inform future strategies for maintaining and updating the World Magnetic Model.
The development reflects a broader shift toward quantum technologies in sensing and navigation. As reliance on satellite-based systems grows, the need for complementary or backup solutions has become increasingly important, particularly in scenarios where GPS access is limited or compromised.
If successful, the quantum magnetometer could play a role in reshaping navigation systems by providing a resilient, signal-independent method for determining position, helping address emerging challenges in both civilian and defense contexts.