Inside GNSS Media & Research

JUL-AUG 2018

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Page 26 of 59 J U L Y / A U G U S T 2 0 1 8 InsideGNSS 27 temperature performance and quartz actually yields a very stable temperature performance over the entire industrial, military and even automotive range." In the webinar Gaber shares a number of slides illustrating the benefits of the gyro technology and the quartz MEMS, and explains how these products are having a strong impact on today's technology enhancements. SPAN SOLUTIONS Gebre-Egziabher prov ided examples of how GNS S i nt eg rat e s w it h ot her sensor s a nd Dixon shared his expertise on NovAtel's SPAN (Synchronized Position Attitude Navigation) of fer ings, a nd a lso in the webina r covers per formance dif ferentiations in GNSS+INS BY THE NUMBERS » PARTICIPANTS´ VIE S solutions—combining a range of IMU sensors with NovAtel receivers. Examples of case stud- ies involving f ixed wheel land vehicles, with comparisons between SPAN and GNSS results in urban canyons, were highlighted. The tech- nolog y is designed to apply a variety of con- straints to any f ixed wheel land vehicle for a variety of applications. There are vehicle velocity constraints such as non-holonomic constraints and dead reckoning if you don't have GNSS, but phase wind-up relative attitude and robust kinematic alignments provide benefits. "In talking about constraints for a fixed wheel land vehicle, and that's non-holonomic con- straints," Dixon explains, "we're trying to gain additional performance for things like vehicles in tunnels for mining equipment, agricultural equipment in fields or in the pit mines. There's military applications as well to really improve the robustness of the positioning and the accuracy of the positioning in as many cases as you can." These constraints help all the time, but they really help when GNSS is either partially denied or totally denied, for example in tunnels, urban canyons and places like forests. The data includes tests from urban canyons, low dynamics and ex- tended GNSS outages. Performance benefits were delivered largely from SPAN tightly-coupled ar- chitecture in one example driving in downtown Calgary, while the performance was driven by IMU and application of land vehicle constraints in a parking garage test with extended GNSS outage. IN CONCLUSION Today, when combing the absolute position and velocity accuracy of GNSS to compensate for errors in IMU measurements with the stable relative position of the INS, these two navigation techniques augment and enhance one another to create a positioning system that can deliver tremendous results. What does having a better quality IMU improve in INS/ GNSS integrated systems (select all that apply) In what harsh GNSS environments do you struggle to provide high accuracy positioning? (select top three) When considering the purchase of an INS solution, how important is the quality of the IMU in your decision? Accuracy 71% Continuity 65% Integrity 63% Availability 49% Urban canyons and/or foliage 70% Very important 42% Jammed 34% Important 40% Spoofed 26% Somewhat important 13% Indoors 42% Not important 2% Tunnels/underground/pipeline 55% Not sure 4% ▼

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