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University of Greenwich

Key Benefits of the Anechoic Chamber:

  • Utilised existing technology – By embedding existing hardware into the new Anechoic Chamber system it was possible to lower upfront cost, reduce re-training time for staff and maintain test accuracy and data repeatability of the test system.
  • Allows future upgrades The architecture and design of the new Anechoic Chamber system allow fast integration of future hardware upgrades and signal processing software.

Our Approach

The University of Greenwich approached Austin Consultants to design and develop a new control system for its anechoic chamber. In the past, single components of the older existing system were updated but the software and control part of the rig were lagging behind these changes.

It was fundamental that as many parts of the test rig were re-integrated as possible into the Anechoic Chamber update project.

Independent components of the Anechoic Chamber had to be connected with suitable signal connections and suitable communication protocols had to be chosen in order to establish a functioning unit.

One of the main challenges was to architect the system so that all the different components could be easily synchronised and work together effectively. In addition to this it was imperative to achieve and maintain the required accuracy levels. Some of the Anechoic Chamber components mentioned above include:

  • Agilent RF analyser
  • Two axis-rotating platform for the antenna test
  • Transmitter with RF switch
  •  Real-time control platform provided by Austin Consultants and PC interface design.
Inside the Anechoic Chamber

The Solution

Austin Consultants’ engineers worked in close partnership with trusted suppliers who assembled and wired the mechanical enclosure for the control system and built up the new external cabling. The design and build phases were characterised by constant quality control and review processes in close correspondence with the client.

The chosen software architecture for the Anechoic Chamber follows a modular approach which offers the necessary long term flexibility to replace and upgrade any components of the rig.

Our knowledge of National Instruments products made it easier for us to identify the many advantages of its use in this project, and the integration of third party hardware was accelerated by using NI hardware.

A particular example is the NI GPIB-USB converter which maintained consistency in software-hardware interaction and also increased the overall interoperability between components.

Inside the Austin Consultants Product for the University of Greenwich
The Austin Consultants Product for the University of Greenwich

Key LabVIEW Features:

  • FPGA control including NI Softmotion components for high accuracy motion of two axis stepper motors
  • Customised polar plot for live and history data display
  • Customised drivers for third party hardware to integrate the existing hardware into the new system.

NI Modules & Toolkits:

  • cRIO 9068
  • NI 9512 motion control modules / NI Softmotion toolkit
  • NI 9401 digital I/O.

Other Hardware:

  • Enclosure and enclosure interior including cabling, switching and rails
  • Amplifiers for stepper drive module.

Our initial contact with Austin Consultants was made at the recommendation of representatives of National Instruments; a world leading test, measurement & control company. We were able to discuss an initial scope of work by telephone conferencing and subsequent conversations enabled a clear definition of the project which was to be developed with a range of options tailored to the limitations of our budget and timescales.

I was totally satisfied with the outcome and I continue to consider Austin Consultants as a provider of solutions within this area of expertise.

Ian Cakebread

Support Services Manager, Faculty of Engineering and Science University of Greenwich

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