RF capture technology basics | How RF capture works

This article describes basics of RF capture technology including its features. It also explains how RF capture works.

We know various image processing techniques for humans such as X-ray, visible light,terahertz & millimeter-wave. RF Capture technology operates at much less power compare to these techniques. Moreover it uses lower RF carrier frequency between 5.46 GHz and 7.24 GHz. Sensors are used in the RF capture system.

Following are the features of RF capture technology.

Specifications RF Capture technology Support
Transmit Power 1/1000 of WiFi signal power
Frequency Range Between 5.46GHz and 7.24GHz
Method of detection Reflection from some of the parts of human body
Coverage Range Less than 100 meters
Accuracy Varies based on identification type (body parts, movement, number of people) and distance from the system.
Applications To determine person behind walls, determine handwriting of person from behind wall, movement of person etc.

How RF Capture Works

RF capture technology

Following are the steps of how RF capture works:
• The system placed behind walls transmits RF signal which penetrates through the walls, but reflects from different parts of the human body.
• The multiple reflections have been captured at different instants in time.
• Based on multiple recorded snapshots along with reconstruction algorithm, the human sketch has been developed by the RF capture system as shown in the figure.

Following are the capabilities of the RF capture technology:
➨RF capture technology estimates positions of the different limbs of the human body such as head, chest, arms and feet.
➨The system estimates different postures of the human being.
➨The RF capture system generates different snapshots for different kinds of persons.
➨It can also determine movement of human beings.


This article has been written based on research conducted at Massachusetts Institute of Technology. Kindly refer the paper published by them for more information.

RF and Wireless Terminologies