# mmSense: Detecting Concealed Weapons with a Miniature Radar Sensor

## TL;DR

mmSense is a portable, real-time radar-based system using millimeter wave technology and neural networks to accurately detect concealed metallic objects while preserving privacy.

## Contribution

This paper introduces mmSense, a miniaturized, real-time radar system with a neural network for privacy-preserving concealed object detection.

## Key findings

- High recognition accuracy on diverse scenes
- Real-time processing at 19 ms per frame
- Operates on standard laptop hardware

## Abstract

For widespread adoption, public security and surveillance systems must be accurate, portable, compact, and real-time, without impeding the privacy of the individuals being observed. Current systems broadly fall into two categories -- image-based which are accurate, but lack privacy, and RF signal-based, which preserve privacy but lack portability, compactness and accuracy. Our paper proposes mmSense, an end-to-end portable miniaturised real-time system that can accurately detect the presence of concealed metallic objects on persons in a discrete, privacy-preserving modality. mmSense features millimeter wave radar technology, provided by Google's Soli sensor for its data acquisition, and TransDope, our real-time neural network, capable of processing a single radar data frame in 19 ms. mmSense achieves high recognition rates on a diverse set of challenging scenes while running on standard laptop hardware, demonstrating a significant advancement towards creating portable, cost-effective real-time radar based surveillance systems.