ArrayTrack: A Fine-Grained Indoor Location System
summary
Prototype combines FPGA-enabled WARP radios and MATLAB servers to extract MUSIC + spatial smoothing angle-of-arrival spectra from multi-antenna APs, uses diversity synthesis to virtualize more antennas and a multipath-suppression heuristic to pick stable direct-path bearings, then hill-climbs a multiplied probability map. Results show a deployed 6-AP setup localizes 41 clients to 23 cm median accuracy in real office clutter and runs in about 100 ms latency.
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