Remote Vehicle Control and Image Transmission Over Zigbee Radio Link.

Abstract:     Abstract—SCADA systems are widely used by numerous industries in order to control a variety of processes. During the development of such a system, one is faced with several challenges concerning reliability, security and congestion control. For example, in a traffic light application, systems to handle reliability and congestion control have to be carefully designed, in order to meet the high safety requirements. In other applications, especially wireless, security is of great importance. This report is aimed to describe and address a few of these challenges, but does so in a scaled down version. This project is part of a larger activity with the overall purpose to navigate a ground vehicle from a control station and provide an operator with visual information. The work covered in this project will focus mainly on implementing reliable data transfer over a ZigBee radio link and on creating an adaptive protocol for efficient transmission of images. To make the existing software more robust to link congestions and faults, we develop methods to handle lost data packets and packet duplication. Additionally, we implement the capability of image transmission from the vehicle to the control station that makes use of an adaptive quality selector especially designed to not interfere with the ability to control the vehicle. Index Terms —SCADA, radio transfer reliability, congestion control, automatic repeat-request, selective repeat