Thursday, September 3, 2026
THE BEARING
A bearing is a direction without a place. Add enough antennas and the network resolves the place anyway. An interactive instrument on phased-array direction-finding, RF fingerprinting, and the regulatory gap that contemplates only the transmitter.
Ten things
- Phased-array / MIMO software-defined radio tiles in the ~4.9–6.0 GHz band as the affordable direction-finding primitive (vendor product family; pin exact SKU before publication).
- United States (2018) on aggregated location from personal devices as constitutionally distinct from single public observations; Katz on knowing exposure.
- Camera/ALPR networks as a pooled, cross-jurisdiction database model rather than a single sensor (ACLU Massachusetts, Data for Justice Project, 2025).
- Real-time crime-center platforms unifying LPR, video, drones, gunshot detection, CAD/RMS/911 and location into one map (vendor product literature).
- A bearing is a direction without a place. Add enough antennas and the network resolves the place anyway. An interactive instrument on phased-array direction-finding, RF fingerprinting, and the regulatory gap that contemplates only the transmitter.
- Everything that makes a bearing dangerous, the distance, the point, the dot on a map an officer can dispatch to, comes from separation between nodes and from correlation across them .
- Every radio has manufacturing imperfections, oscillator drift, clock skew, power-amplifier nonlinearity, that bias its emissions in a way that is stable for the life of the hardware.
- A camera network's standing defence is the public-exposure logic: a plate faces the street, a car on a road has a reduced expectation of privacy, the system only logs what any bystander could see.
- And aggregated location drawn from a personal device, accumulated across nodes into a pattern of life, is precisely the category that courts have already flagged as different in kind from a single observation.
- RF / physical-layer device fingerprinting surviving MAC randomisation via hardware imperfection (clock skew, oscillator drift, PA nonlinearity) — established in the wireless-security literature.
Five questions
Which term completes this sourced statement? “_____ / MIMO software-defined radio tiles in the ~4.9–6.0 GHz band as the affordable direction-finding primitive (vendor product family; pin exact SKU before publication).”
Which term completes this sourced statement? “Camera/ALPR networks as a pooled, cross-jurisdiction database model rather than a single sensor (ACLU _____, Data for Justice Project, 2025).”
Which term completes this sourced statement? “A bearing is a direction without a place. Add enough antennas and the network resolves the place anyway. An interactive instrument on phased-array _____, RF fingerprinting, and the regulatory gap that contemplates only the transmitter.”
Which term completes this sourced statement? “Every radio has manufacturing imperfections, oscillator drift, clock skew, _____ nonlinearity, that bias its emissions in a way that is stable for the life of the hardware.”
Which term completes this sourced statement? “And aggregated location drawn from a personal device, _____ across nodes into a pattern of life, is precisely the category that courts have already flagged as different in kind from a single observation.”