Foxhunt Platform Development Log

A harvester-analyzer pipeline extracts radio unit ID patterns from live P25 control channel traffic, building a data asset that maps RID prefixes to law enforcement agencies.

The map visualization was completely overhauled — discrete pin-drop markers replaced by colored polyline stripes painted along road segments near each detection.

The most consequential bug fix in the project’s history: every GPS location update was destroying the engine’s observation windows, making geolocation permanently impossible.

A full live dashboard replaced the static mockup — Leaflet dark tiles, auto-reconnecting WebSocket, real-time alert table, and PIN_DROP markers with auto-expiry.

A Celwave CF800-6P cavity bandpass filter joined the RF chain, and a calibration drive against the Brunswick P25 tower site validated the end-to-end signal pipeline.

Today's work involved a detailed RF hardware analysis to understand the detection range limits of the current scanner setup and diagnose an intermodulation interference problem.

With the core geolocation engine stable and field-tested, I shifted focus to planning the final week before investor outreach. The remaining schedule covers final validation testing, demo video production, and investor outreach preparation...

Analysis of the field test data revealed that 99% of captured RF observations had a radio unit ID of zero — meaning the decoder couldn't extract the individual transmitter's identi...

The longest field test to date produced the most data — and exposed the most serious performance bug I've encountered. The geolocation engine was emitting results for nearly five ...

Today's work focused on signal processing refinements to improve the scanner's ability to distinguish real P25 transmissions from background noise. The core improvement is a narrow...

The Android Auto integration moved from the desktop emulator to actual vehicle hardware today. The implementation displays color-coded detection pins on the head unit's map and pro...

Three significant accuracy improvements deployed today, each attacking a different source of geolocation error.

I stepped back from the code today to think strategically about what the platform needs to demonstrate, and to whom. The Foxhunt Platform is ultimately a consumer-facing situation...

A subtle but critical bug surfaced during post-drive analysis. The map pins were appearing at the device's location — where I was when I received the signal — rather than at the...

Radio waves don't travel in straight lines over terrain. A transmitter on one side of a ridgeline is effectively invisible to a receiver on the other side, regardless of how close ...

I took the platform out for its first real-world field test — and immediately discovered why bench testing and field testing are different disciplines. The system connected, the s...

A milestone day. I completed and deployed the central server component that ties the entire platform together — the real-time geolocation engine that processes RF observations fro...

Two major workstreams today, both foundational. First, I began building out the platform's database of P25 trunked radio systems to achieve statewide coverage across Maryland. The...

Today I stepped back from code to think about hardware. The Foxhunt Platform currently demonstrates RF geolocation viability using off-the-shelf SDR dongles connected to a laptop ...

A foundational design decision crystallized today: the scanner should measure uplink frequencies, not downlink. This single choice defines the entire geolocation approach and what ...

Today the Foxhunt Platform's three components talked to each other for the first time. The scanner running on a MacBook Air, the Android app on a Pixel phone, and the VPS backend &...