General Meeting (Speaker: Jade Morton) on Wed. Dec 14th

The next general meeting of the ION North Star Section will be Wednesday Dec 14th in Mechanical Engineering Building Room ME 1130 at the University of Minnesota (

Please email us at, if you plan to attend.

The agenda for the meeting is:

    6:00 Meet and Greet
    6:30 Welcome
    6:35 Keynote Speaker
    7:30 Closing remarks

Sandwiches and beverages will be served during the Meet and Greet portion of the meeting.

Keynote Presentation:

Title: Ionosphere Effects and other GNSS and RF Navigation Research at Miami

Presenter: Jade Morton, Professor at Miami University


The ionosphere is a dynamic medium characterized by irregularities in electron density distributions which cause refraction, scattering, and diffraction of GNSS signals that traverse the ionosphere.  The results of these signal interactions with the ionosphere are highly variable signal group delays and carrier advances, deep signal amplitude fading, and random carrier phase fluctuations.  While the group delay and carrier advances cause GPS range measurement errors which cannot be totally eliminated by the current state-of-the-art receivers, the signal amplitude fading and carrier phase fluctuations, collectively referred to as ionospheric scintillations, may result in receiver loss-of-lock of satellite signals.  These ionosphere effects pose a serious challenge for applications that require continuous and high accuracy measurements.

In this presentation, I will focus on two of our current research efforts in ionosphere effects.  The first effort aims to assess the higher order ionosphere error in GPS receiver range measurements and to characterize the higher order error temporal and spatial structure.  The second study concerns the establishment of a multi-constellation, multi-band GNSS receiver array in Alaska to collect GNSS signals under both natural and controlled ionospheric scintillation conditions, and the development of robust GPS receiver algorithms for the estimation of satellite signal parameters. Technical approaches, recent findings, and significance of both projects will be discussed in the presentation. 

Additional research activities involving short delay time GPS multipath estimation and mitigation, multi-use of ultra-wideband radar for imaging, communication, and navigation, and a few navigation application projects will be briefly highlighted


Dr. Jade Morton is a Professor in the Department of Electrical and Computer Engineering at Miami University. She holds a BS in Physics from Nanjing University, China, a MS in Electrical Engineering from Case Western Reserve University, a MS in Systems Analysis from Miami University, and a PhD in Electrical Engineering from the Pennsylvania State University.  She was a post-doctoral research fellow at the University of Michigan Space Physics Research Laboratory working on satellite-based remote sensing of the atmosphere.  Her current research interests are in high accuracy and high sensitivity GNSS receiver algorithms, ionosphere effects on GNSS performance, software defined UWB radar for navigation, and navigation sensor integration and applications.   She has served in various capacities at the Institute of Navigation (ION) and IEEE and chaired numerous sessions, tracks, workshops, and conferences for ION and IEEE.  She is a member of the editorial board of the journal GPS Solutions and is an associate editor for IEEE Transactions on Aerospace and Electronics Systems.  She is also a technical committee member of the IEEE Microwave Theory and Technology Society, Digital Signal Processing Subgroup.  Dr. Morton has published over 100 technical papers, received over $3M in grants and contracts, and mentored hundreds of students on navigation related projects.  She is currently the vice chair of the ION Satellite Division and ION Outreach Chair.