title: "What Data-Driven Algorithms Changed in Contactless Sleep Sensing, and What They Could Not" published: true tags: radar, iot, sleep, health canonicalurl: https://249263431.github.io/60GHz-Radar-SDK/fundamentals/2026/10/31/ai-sleep-staging-rad...

Antenna Channels, Virtual Aperture, and What More of Them Actually Buys You Channel counts are the specification most often quoted when radar modules are compared: one transmit and three receive, four and four, six and six. The comparison is meanin...

Where the Beam Actually Lands: Coverage from Beam Angle and Mounting Height A datasheet gives you a beam angle and a mounting height. What you actually need to know is how much floor the radar covers, and how much of that footprint is usable. Those...

Distance and Speed from a Radar Echo: Two Equations, and What the Module Datasheets Publish A radar echo carries two kinematic quantities: range — how far away the reflecting target is — and radial velocity, the component of the target's motion alo...

Updating Radar Firmware Without a Cloud: Self-Hosted OTA over MQTT Most connected devices want you to push firmware through somebody's cloud. These do not ask for that. The sleep and fall radars fetch an image from a URL you hand them, and the comma...

title: "Online Says It's Connected, HeartBeat Says It Works: Reading Two Status Signals Instead of Guessing From Silence" published: true tags: iot, mqtt, radar, monitoring canonicalurl: https://249263431.github.io/60GHz-Radar-SDK/guide/2026/10/27/o...