John Pottle has over 20 years’ experience in technical, marketing and business development positions in communications and navigation. Currently, he is responsible for marketing at Spirent Communications’ Positioning Technology division in Paignton, UK. Spirent provides navigation and positioning test systems to GNSS technology and applications developers. Before joining Spirent, Pottle led service development at Intelsat in USA and worked with BT plc in London, UK. Pottle trained as a Communications Engineer and also holds a Masters in Business Administration.
Today, GPS applications and services are everywhere, and accessible to almost everyone.
In the UK you can now purchase a portable “SatNav” system, admittedly from a manufacturer you might not have heard of, for less than it costs to fill your car with fuel! This is great news indeed, right? Well, maybe … but then maybe not. When was the last time you opened your morning paper and did NOT find an article about a lorry blocking a country road or a car getting stranded somewher...
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GPS and inertial sensors complement each other extremely well.
GPS works best with a good view of the sky. When the sky view gets obstructed, for example in an aircraft roll or when a smartphone gets taken indoors, GPS will not continue to track and the navigation capability is lost. Inertial sensors continue working in all conditions – move them and you get an output from the sensor. The biggest weakness of inertial sensors is that errors are cumulative.
By combining GPS and ine...
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