Indoor Positioning Using Fine Time Measurement and Sensor Strobes

The system segments the timing measurement process into multiple phases: coarse timing measurement using conventional methods, followed by fine timing measurement using strobe signals synchronized with sensor data sampling. This segmentation allows the system to achieve high positioning accuracy through fine measurements only when needed, rather than continuously, thereby managing overall system complexity while improving positioning precision.

The system performs preliminary coarse positioning using conventional wireless timing measurements to determine approximate device locations. Based on this preliminary information, the system then activates fine timing measurement with strobe signals and sensor data sampling only in regions or scenarios where higher precision is required, avoiding the complexity of continuous fine measurements across all scenarios.

Instead of continuous high-frequency sensor sampling, the system implements periodic fine timing measurements triggered by specific events such as packet receptions or transmissions. The strobe signal activates sensor data storage only at these periodic intervals, capturing necessary positioning information while allowing the sensor system to remain in a lower-power state between measurements, thus reducing overall energy consumption.

The system uses existing wireless communication packet timing events to trigger fine positioning measurements, rather than requiring separate dedicated measurement triggers. The same communication infrastructure that transmits data packets also provides the timing references for activating fine measurements, allowing the system to derive positioning opportunities from its own operational rhythm without additional energy-expensive triggering mechanisms.

The system extracts and stores only the specific sensor data samples that are temporally correlated with packet events using the strobe mechanism. Rather than processing all sensor data continuously, the system isolates and stores only the relevant samples at packet timing moments, reducing the volume of data requiring subsequent processing while maintaining the precision needed for accurate positioning calculations.

The strobe signal acts as an intermediary mechanism that bridges the wireless packet timing events and the sensor data sampling system. It translates packet timing information into precise sensor data capture triggers, and the stored sensor data serves as an intermediary record that can be processed offline or at lower computational intensity, decoupling the high-precision timing requirement from continuous high-rate processing.