QuadRF can spot drones and see WiFi through my wall

A writer testing a prototype QuadRF phased-array radio said the device can detect drones in flight and visualize Wi-Fi signals through walls. The QuadRF, built around a Raspberry Pi 5 and an FPGA board with picosecond-level timing, performs advanced signal processing and beamforming in the 4.9 to 6 GHz range. The writer said the unit creates a Wi-Fi hotspot on boot and runs a browser-based VNC session for software including GNU Radio and a custom augmented-reality visualizer that displays RF signals as colored blobs. During testing, the writer said the device picked up a DJI Mini Pro 4 drone behind a studio and showed neighboring Wi-Fi networks in different colors. The writer noted the user interface is rough and gain control is clunky. The device uses the Raspberry Pi's MIPI lanes to stream I/Q data at over 5 Gbps, a method the developer said is simpler and more reliable than USB. The project is crowdfunding on Crowd Supply where a basic kit costs $499. The writer said the campaign has exceeded expectations and the enclosure will switch from 3D printing to injection molding. The writer pre-ordered a unit and said the device is useful for local software-defined radio applications.