TRX is entirely focused on delivering accurate indoor location through sensor fusion, ranging, and mapping technologies. The approaches TRX has implemented are unique, and allow for ubiquitous location when you are operating in buildings that are difficult or impossible to instrument, and where significant time spent "mapping" a building may not be possible. Maintaining strong IP protection for our technology is important for our distribution partners and for application partners who integrate TRX location services as part of their overall solutions set.
TRX has recently been issued two new patents from the United States :
- 9,322,648: covering the use of sensor and map information for improved elevation accuracy in and around structures.
- 9,297,658: covering improved location and heading accuracy using Wi-Fi signatures
TRX was also issued a patent in Hong Kong and in Australia on our methods for 3D tracking and mapping which form the basis for our Feature SLAM work. TRX now has a total of 12 US and 12 international patents, covering GPS-denied and indoor mapping and location determination.
TRX's patents cover methods for 3D tracking and mapping, including sensor fusion for motion classification and drift estimation, mapping (signature mapping - both signal strength and magnetic - and structural inference based on a tracked user’s movement) and map-based corrections. Later TRX patents build on these foundational patents, adding improvements, including tracking of moving cellular devices, heading corrections using building constraints and occasional good magnetic sensor data, sensor fusion for robust elevation determination indoors and outdoors, and automatic sensor calibration. These later patents also enhance TRX's map inference methods, adding unique feature descriptors (including unique structure and signal information) that enable our methods for automated map fusion.
The methods covered by TRX's patent portfolio provide benefit to improved location and mapping in the following areas:
- Crowdsourced mapping creating a robust location assistance database - TRX's unique mapping methods merge and fuse data coming from many standard mobile devices to provide an efficient mechanism for creating and updating indoor structural building models, signal and routing maps at a large scale through crowdsourcing. These indoor maps can be used to deliver more accurate location and heading (direction of travel) and to enable indoor routing.
- Robust elevation calculation using sensor fusion and mapping - TRX elevation engine delivers floor level elevation determination indoors using a combination of sensor fusion and mapping methods. TRX's sensor fusion methods remove pressure anomalies due to weather and HVAC systems and adjust device offsets to provide reliable indoor floor level elevation.
- Heading determination using sensor fusion and structural map inference - Heading errors (direction of travel) are the largest source of location errors in inertial tracking systems. Maintaining an accurate heading is one of the key challenges in infrastructure free inertial navigation and is critical for tracking cellular devices, which may be moving relative to the tracked person. TRX’s patents cover multiple unique methods of estimating and correcting the tracked person's heading. The techniques include sensor fusion and structural map inference, magnetic and RF mapping.