Remove complexity in GPS and CDMA multi-signal analysis with new methodology

This mathematical methodology enables the testing of GPS and other ‘code-division multiple access’ (CDMA) communication system receivers in a streamlined way, reducing cost and SWaP (size, weight, and power) requirements.

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Background

When creating CDMA communications signals, such as GPS, mobile phones, two-way or emergency service radios, and more, it is essential to test how the technological devices pick up and filter the signals they receive. Systems that perform this testing function are often known as ‘simulators’.

For example, GPS (or GNSS – ‘global navigation satellite systems’) uses satellites to enable a device to pinpoint and track exact location. In order to test GPS receivers in a practical way (ensuring the future user would have access to location and GPS functions around the world in a diverse range of environments), multiple satellite signals need to be artificially recreated and simulated within a lab setting. However, this simulation process is complex, and the amount of equipment needed is often expensive.

The solution

The Defence Science and Technology Laboratory (Dstl) has created a novel mathematical technique that allows the much quicker, simpler, and potentially cheaper generation of artificial GPS (or GNSS) and CDMA signals.

Broadly, this approach generates and processes data in the frequency domain, rather than the time domain. Simulating the signals in this way allows equipment to be tested in a controlled, repeatable manner, with less equipment needed – reducing cost and maintenance.

Key benefits

The technology simplifies and streamlines the artificial generation of GNSS and CDMA signals, allowing less complex hardware requirements.
Fewer pieces of test equipment means lower costs and power needs, and less maintenance and space needed compared with other options.
The functionality of devices can be tested in different locations and environments, without ever leaving the testing laboratory.

Potential applications

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Test systems for GNSS

This methodology could be used as part of testing satnavs and other GNSS devices, enabling simpler test systems to be used.

Mobile telecoms systems

The same benefits can be applied when utilising this methodology in testing communication systems, such as mobile phones, two-way radios, emergency services radios, and any device that requires CDMA signals.

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Defence applications

This methodology could be used to simplify the simulation of communication, location, and navigation functions in a secure environment.