ERIS - ESPAR Reactive Isolation System

ERIS is a PoC system used to research ESPAR (Electronically Steerable Parasitic Array Radiator) capabilities in field of isolating the medium between a transmitter and a receiver communicating on 2.4 GHz frequencies.

Table of Contents

• ERIS - ESPAR Reactive Isolation System
  • Table of Contents
  • Architecture
    • Components
    • General architecture
    • Beacon connection architecture
  • Software
    • Building
      • Open project in devcontainer - suggested for development
      • Run VScode task - suggested for fast testing
    • Flashing
      • Beacon
      • ESPAR board
    • Control

Architecture

Components

1. ESPAR - Receiver
2. Beacons - Transmitter/Jammers
3. RPi4 - System control unit

General architecture

Beacon connection architecture

Software

ERIS software is compatible with two platforms:

1. NRF52840 dongle - used as beacon
2. Custom NRF52840 board - designed for ESPAR integration

ERIS device can act in one of four modes:

Mode	Description	Agent
RX	listen for packets	ESPAR platform (master)
TX	send packets with incrementing 32bit value	transmitter beacon (client)
JAM	emit a continuous wave on a given channel to jam transmited packets	jamming beacon (jammer)
Idle	standby mode

Building

Project can be built in one of two ways:

Open project in devcontainer - suggested for development

1. Use vscode option to reopen the project in devcontainer

2. Build espar software

   make build_espar

   ESPAR platform software can be found in pca10056/armgcc/_build/nrf52840_xxaa.hex

3. Build beacon software

   make build_dongle

   NRF52840 dongle software can be found in pca10059/armgcc/_build/dfu.zip.

Run VScode task - suggested for fast testing

• Run vscode configured build task (ctrl+shift+B)

Flashing

Beacon

./scripts/dut_ctrl.py /dev/ttyACM1 reset && ~/.nrfutil/bin/nrfutil dfu usb-serial -pkg pca10059/armgcc/_build/dfu.zip -p /dev/ttyACM1 -b 115200

ESPAR board

nrfjprog --family NRF52 --recover && nrfjprog --family NRF52 --program pca10056/armgcc/_build/nrf52840_xxaa.hex && nrfjprog --family NRF52 --reset

Control

ERIS boards can be controlled through USB Serial (/dev/ACM<id>) connection using scripts/dut_ctrl.py script.

For usage instructions run:

./scripts/dut_ctrl.py --help