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real-time indoor location: UWB/BLE tags and anchors, TDoA/AoA multilateration, anchor clock sync, location engine, geofencing, asset and staff tracking apps

Zebra, Quuppa, Sewio, Pozyx

SystemTechniques · 30Primitives · 102 rtls Clock synchronizationdistributed · medium: Estimate a clock's offset from four timestamps, filter out queueing noise, and steer the clock smoothly; NTP gets about a millisecond, PTP with hardware timestamps under a microsecond.›Desired-state reconciliationdistributed · medium: Declare the target in a store; controllers repeatedly diff actual against desired from full state and apply idempotent fixes, so missed events only delay convergence.›Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›A/B partition updatesembedded · medium: Two bootable slots and a small atomic metadata block: write the new image to the idle slot, try it once, and fall back by itself unless it reports healthy.›Multi-object trackingmachine-learning · medium: Turn per-frame detections (camera boxes or radar plots) into persistent IDs by predicting each track, gating, assigning and managing track births and deaths.›Levenberg marquardtnumerics · medium: Damped Gauss-Newton nonlinear least squares for model calibrationKalman filterrobotics · low: Optimal recursive estimator for a linear system with Gaussian noise: fuses a motion model with noisy measurements into a state estimate plus its covariance.›Extended Kalman filterrobotics · low: Kalman filter for nonlinear motion and measurement models: linearize f and h with Jacobians at the current estimate each step. The default estimator in robot navigation.›Hdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesBle advertisingembedded · low: Bluetooth LE advertising packets, scanning and rotating identifiersUwb rangingembedded · low: UWB two-way ranging and angle of arrival for precise device findingGeospatial cell index (geohash, S2,…geometry · low: Map a lat/lon to a 64-bit cell id on a hierarchical grid, so "near" becomes an integer range scan in any ordinary sorted index.›Point in polygongeometry · low: Ray-casting/winding tests and indexed polygon lookup for reverse geocodingR-treegeometry · low: A balanced tree of nested bounding boxes that indexes rectangles and points, answering window and nearest-neighbour queries by pruning whole subtrees.›Process supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Mqtt protocolnetworking · low: MQTT pub/sub: topics, QoS 0/1/2, retained messages, sessions and keepaliveMutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Beamformingsignal-processing · low: Phased-array weights that steer radio energy toward a receiver; per-client steering vectorsBle gattsignal-processing · low: Bluetooth LE link layer, ATT/GATT services and characteristics, connection intervals and pairingExponential smoothing (ETS, Holt-Wi…statistics · low: Forecast by keeping a few running states (level, trend, seasonal) updated by a fraction of each forecast error; O(1) memory per series and a strong baseline.›Graceful drainingsystems · low: On a termination signal, stop taking new work, finish in-flight work until a deadline, tell clients to reconnect elsewhere, then exit; clients resume from a token.›Publish subscribe event bussystems · low: In-process or on-box topic bus decoupling producers and consumers with bounded queues+ 23 more techniques+ 86 more primitives

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