NovAtel's Annual Journal of GNSS Technology Solutions and Innovation

Issue link:

Contents of this Issue


Page 23 of 51

geomatics velocity 2014 For more Solutions visit 24 NovAtel SPAN-SE with FSAS IMU together with Hasselblad camera in Robinson R44 helicopter used for powerline surveys in South America. Complementing GNSS with inertial mea- surements, provides more robust and more accurate positioning in challenging condi- tions where GNSS alone is limited, and offers continuous position and attitude output. The deep coupling of GNSS with inertial technol- ogy provides demonstrable benefits of faster satellite re-acquisition and faster re-initializa- tion after outages, such as steep turns. Also, the ability to post-process GNSS and inertial data with NovAtel's Inertial Explorer ® soft- ware provides additional tools for the user to improve upon the accuracy and integrity of the combined solution. Every project requires installation and train- ing and then front line field support. Factors to consider for every installation include the type of flight system, existing equipment, space available in the plane, the type of camera, and of course, cost. Flexibility and Performance Most customers have invested heavily in cam- eras, sensors and flight systems. They want to reuse those solutions as much as possible even as they expand on their mapping capabilities. Kathofer adds, "Most don't want or need to re- place everything in their suite of hardware." The first step is to understand the customer's intended application and associated precision parameters, existing equipment and, especial- ly, the aircraft. Frontier Geomatics has a South Ameri- can customer who sought the benefits of a GNSS+INS system to work with a Hasselblad medium format camera to support power line mapping. The system had to stow under the rear seat-cover of the Robinson R44 he- licopter. The customer opted for the NovAtel SPAN- SE GNSS receiver with FSAS IMU. The IMU-FSAS™ is a tactical grade IMU from iMAR GmbH. With low noise, stable accel- erometer and gyro sensors, the IMU is well- suited to the power line mapping surveys that the company performs. IMU measurements are sent from the IMU-FSAS to the GNSS re- ceiver where a blended GNSS+INS position, velocity and attitude solution is generated at up to 200 Hz. "In this case, the the IMU-FSAS. is a little too much performance for the low-altitude power line mapping application," recalls Kathofer. "However, the client chose the higher end FSAS IMU because of its flexibility to move between a medium format and large format camera as needed to meet other mapping needs." Small and Mighty For another customer, Blue Skies Consulting in Belen, New Mexico, Kathofer selected two No- vAtel SPAN receivers for use with two different cameras for different purposes. The customer specializes in digital photogrammetric and re- mote sensing data for mapping and surveying applications. The firm uses Microsoft/Vexcel Ultra- Cam Lp digital camera integrated with the Track Air flight management system, a Leica Geosystems PAV30 gyro-stabilized camera mount, and a NovAtel SPAN-SE receiver with

Articles in this issue

Links on this page

view archives of Velocity - 2014