GPS World, September 2016
MARKET Segment Snapshot Applications Trends News WATCH OEM 2 Multi GNSS Multi PNT Testing The Signal Simulation and Testing Fundamentals and New Frontiers webinar generated in depth Q A printed in part here Inertial positioning can be tested with GNSS Download full webinar free Question What is the toughest multiconstellation performance parameter to meet John Fischer Spectracom In the multiconstellation environment having to test for synchronization between the different constellation presents a challenge The timing references GPS GLONASS Galileo and BeiDou use are all slightly different Each has a different time base and they do different things to control them Its a challenge for receiver designers to make sure that they are synchronizing correctly There are a couple of classes of multi constellation receivers Some are multi constellation but theyre only doing one constellation at a time Others create a larger navigation solution using satellites from different constellations all into one solution Thats a more challenging set up Theres more of an accuracy dilution problem in the second case because depending on a couple of factors you might be making it less accurate by having more constellations because youre having more availability You can if youre really clever in doing these very large matrix solutions combine satellites from different constellations but thats a very big challenge The third challenge is multi frequency As you do these added things your receivers are getting L1 L2 and L5 even further away Wideband receivers have issues of flatness and frequency response group delay and so on big challenges for receiver designers See Q A page 26 Performance in real time SEPTEMBER 2016 WWW GPSWORLD COM GPS WORLD 25
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