Stuart Smith

Stuart Smith is a Product Manager at Spirent Communications in Paignton, UK. He has been with Spirent in Paignton for 12 years working as an RF Design Engineer and Applications Engineer prior to his current role within the Marketing team. He holds an Honours degree in Electronics and Communications Engineering from the University of Plymouth, UK and a Professional Diploma in Marketing from the Chartered Institute of Marketing, UK.

Recent Posts

Faster, Surer Industry Certification for GNSS-Enabled Products

Today, the satellite positioning and navigation market is moving with phenomenal speed. Most vendors and manufacturers of GNSS-enabled devices are conscious that—to give their new products the best chance of thriving—they must deliver them to market as rapidly as possible. And one of the greatest obstacles for many is the process of product certification. Minimising the impact of certification on time to market In terms of minimising certification’s impact on time to market...

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Choosing the right chipset for your device

The Uses of Automated Testing Software: Choosing a GNSS Chipset Selecting a GNSS chipset for a new location-aware device is a critical R&D decision. Many factors need to be taken into consideration, and many factors—both intrinsic and extrinsic—can influence the accuracy and performance of the chipset within the final device design. One thing’s for certain—getting it wrong can be an expensive, even dangerous mistake. To give a basic example, an inexpensive GPS chips...

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Will your GNSS system manage the upcoming leap seconds insertion?

The International Earth Rotation and Reference Systems Service (IERS), the organisation which monitors and manages the difference between the atomic Universal Coordinated Time (UTC) and Earth-rotation-based time, UT1, has decided that a further leap-second will be inserted on 30th June 2012 at 23 hours, 59 minutes and 59 seconds. This insertion - the first since 2008 - is intended to compensate for the accumulated difference between UTC and UT1, and the fact that the Earth’s rotation is cu...

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Automate your GNSS Receiver Testing

“We are in Testing Times” A phrase being used more and more these days in relation to many things. However ‘Testing Times’ is also a concern to anyone responsible for planning, resourcing and carrying out GNSS testing. We all want our products to be designed, developed and out to the market in ever-shorter timescales. The time taken to perform important testing is often significant. How great it would be to be able to reduce this time, make things more efficient? Well, ...

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How GNSS Navigation can Improve Safety Critical Navigation on the Railway

The use of GNSS in navigation, timing and related systems for transportation is ever increasing. The railways are no exception. There are various programmes underway looking at the application of GNSS to the railway for safety-critical functions. Significant among these is train location and control. Traditional line-side signalling is expensive through installation, operation and maintenance. It is inflexible; signalling headways and hence capacity are determined by physical location of signals...

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Testing GNSS Receivers in a Production Environment

Manufacturers of consumer products routinely perform functional testing on all production output, and it would appear that adding some form of location testing to these production test routines would be sufficient to verify the reliability of the GNSS receiver within the end product. However, it is all too easy to adopt the attitude that the simplest of tests will suffice – particularly when the duration of each test can have a significant impact on productivity. Although it may be the...

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Certification of GNSS Devices

Traditionally, civilian use of GPS was seen as free and to a large extent “at your own risk”. The typical performance one might expect was stated in the relevant Interface Control Documents (ICD’s) but no guarantee of service was given. The reason for this was the historical remit of GPS as a system to satisfy US military requirements, the civilian use of the coarse acquisition (C/A) ranging code being essentially a by-product of its primary use, which was to provide class...

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How a GNSS Simulator can Help Test the Multipath Performance of GNSS Receivers

Like any form of radio receiver, a global navigation satellite system receiver will be subject to interference from multipath effects arising from the reflection and refraction of its intended satellite signals by both natural and man-made artifacts. However, unlike some radio systems in which a small degree of interference may be tolerable to the end user, multipath interference will have an unacceptable effect on a GNSS receiver, making the output both unstable and inaccurate. There are ...

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