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The world's premier professional society advancing positioning, navigation, and timing (PNT).

10/23/2026

𝗛𝗮𝗽𝗽𝘆 𝗜𝗻𝘁𝗲𝗿𝗻𝗮𝘁𝗶𝗼𝗻𝗮𝗹 𝗚𝗡𝗦𝗦 𝗗𝗮𝘆! 🌎🛰️
Every year on October 23, the global PNT community celebrates the vital contributions global navigation satellite systems (GNSS) make to the modern world. The date mirrors the foundational GPS frequency of 10.23 MHz, the original heartbeat of GPS satellites, signals, and receivers.

Today, we honor the developers and visionaries behind satellite navigation and the impact GNSS has across transportation, agriculture, aviation, surveying, and beyond.

Share how you're celebrating! Be sure to tag us in your celebratory posts with

10/21/2026

Every October 23, the PNT community acknowledges the extensive impacts of GNSS technologies across various sectors during 𝗜𝗻𝘁𝗲𝗿𝗻𝗮𝘁𝗶𝗼𝗻𝗮𝗹 𝗚𝗡𝗦𝗦 𝗗𝗮𝘆 🌎🛰️. This Friday, the celebration starts again. Where will you be on 10.23? Tell us in the comments and remember to tag us in your celebrations!

A look back at last year's global celebration:
📸 1: NavSAS at Politecnico di Torino in Turin, Italy
📸 2: Dr. Joseph J. Rushanan and Dr. Keith McDonald at MITRE Corporation
📸 3: EUROCAE’s GNSS Resilience Virtual Seminar
📸 4: ESA Navigation’s photo expo in Noordwijk, the Netherlands
📸 5: Fraunhofer IIS in Erlangen, Germany
📸 6: Syntony GNSS in Toulouse, France
📸 7: Dr. Richard Langley and UNB Geodesy & Geomatics Engineering in New Brunswick, Canada
📸 8: Prof. Kai-Wei Chiang of NCKU lecturing at the University of Calgary Schulich School of Engineering
📸 9: The University of Alabama’s interdepartmental celebration, organized by Dr. Thejesh N. Bandi
📸 10: ION’s Dayton Section meeting

10/19/2026

Hard to believe it's been one month since ION GNSS+! 📸 Swipe through for a look back at our 40th anniversary trivia night!

📅 𝗦𝗔𝗩𝗘 𝗧𝗛𝗘 𝗗𝗔𝗧𝗘! ION GNSS+ 2027 returns to Orlando, Florida, September 20–24, 2027. We can't wait to see you there!

10/16/2026

Where will you be on 𝟭𝟬.𝟮𝟯? 🌎

In just one week, the global PNT community will unite once again for the fourth annual 𝗜𝗻𝘁𝗲𝗿𝗻𝗮𝘁𝗶𝗼𝗻𝗮𝗹 𝗚𝗡𝗦𝗦 𝗗𝗮𝘆 on Friday, October 23!

At ION GNSS+ 2026, we invited attendees to snap a photo and mark where they'll be spending International GNSS Day on our giant world map. Now, we're counting down the days until the PNT community comes together across the globe!

📸 How will you celebrate? Whether you're hosting an event, gathering with colleagues, or spreading the word about GNSS, we want to see it! Share your photos, tag ION, and use for a chance to be featured.

🔗 Learn more: https://www.ion.org/news/internationalgnssday.cfm

10/14/2026

Every year, the 𝗜𝗢𝗡 𝗔𝗻𝗻𝘂𝗮𝗹 𝗔𝘄𝗮𝗿𝗱𝘀 recognize the people moving positioning, navigation, and timing forward. Nominations for the 2026 awards close tomorrow, October 15, and this is your 𝗙𝗜𝗡𝗔𝗟 𝗥𝗘𝗠𝗜𝗡𝗗𝗘𝗥 to recognize someone who has made a lasting impact on the field.

Swipe through to celebrate our 2025 recipients:

𝗕𝘂𝗿𝗸𝗮 𝗔𝘄𝗮𝗿𝗱: Dr. Sharbel Kozhaya, Joe Saroufim*, and Dr. Zaher (Zak) M. Kassas, for their paper, "Unveiling Starlink for PNT," published in the Spring 2025 issue of 𝙉𝘼𝙑𝙄𝙂𝘼𝙏𝙄𝙊𝙉, Journal of the Institute of Navigation

𝗛𝗮𝘆𝘀 𝗔𝘄𝗮𝗿𝗱: Francisco Javier Benedicto Ruiz, for visionary leadership and sustained contributions that enabled EGNOS, Galileo, and the definition of
next-generation navigation, securing Europe’s global leadership in satellite navigation

𝗣𝗲𝗿 𝗘𝗻𝗴𝗲 𝗘𝗮𝗿𝗹𝘆 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁 𝗔𝘄𝗮𝗿𝗱: Dr. Rong Yang*, for the advancement of GNSS resilience in challenging environments

𝗣𝗧𝗧𝗜 𝗗𝗶𝘀𝘁𝗶𝗻𝗴𝘂𝗶𝘀𝗵𝗲𝗱 𝗦𝗲𝗿𝘃𝗶𝗰𝗲 𝗔𝘄𝗮𝗿𝗱: Dr. James Camparo, for excellence in collaboration and education in addressing technical risk in the application of atomic clocks for space-based position, navigation, and timing

𝗦𝘂𝗽𝗲𝗿𝗶𝗼𝗿 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁 𝗔𝘄𝗮𝗿𝗱: Captain Celestia P. Holguin*, for improved MC-130 student flight training outcomes, and pioneered innovative airdrop procedures

𝗧𝗵𝘂𝗿𝗹𝗼𝘄 𝗔𝘄𝗮𝗿𝗱: Dr. Daniele Borio, for pioneering multidimensional GNSS meta-signal processing using hypercomplex numbers, enabling optimal multi-frequency signal reconstruction, robust measurement techniques adopted by industry, and advancing receiver design

𝗧𝘆𝗰𝗵𝗼 𝗕𝗿𝗮𝗵𝗲 𝗔𝘄𝗮𝗿𝗱: Dr. Todd A. Ely, for seminal contributions to the advancement of autonomous space navigation technologies, including the Deep Space Atomic Clock, and one-way uplink radiometric tracking in lunar orbit

𝗪𝗲𝗲𝗺𝘀 𝗔𝘄𝗮𝗿𝗱: Matt Harris, for significant and sustained contributions to the development and standardization of GNSS for aviation applications

*Not pictured

𝗦𝘂𝗯𝗺𝗶𝘁 𝘆𝗼𝘂𝗿 𝗻𝗼𝗺𝗶𝗻𝗮𝘁𝗶𝗼𝗻: ion.org/awards

09/25/2026

ION GNSS+ 2026: A packed plenary, a full exhibit hall, an evening with ION PNT masters, students presenting alongside engineers whose work they grew up reading, and a 40th meeting anniversary Trivia Night Celebration with the ION Satellite Division and its founders.

Congratulations to Dr. Alison Brown, recipient of the Johannes Kepler Award; Dr. Zachary Clements, recipient of the Bradford W. Parkinson Award; Faezeh Mooseli and Joe Saroufim, of The Ohio State University, winners of the ION GNSS+ 2026 Best Student Paper Award; and Dr. Dorota Grejner-Brzezinska, who was recognized for her years of service to the ION’s Satellite Division. All received their awards at Friday's awards luncheon.

Thank you to the Program Committee and the Satellite Division Executive Committee, whose volunteer work makes this meeting possible, as well as to our exhibitors, sponsors, media partners, and corporate members who showed up in force.

Here is a look back at the week.

Welcome to the newly elected Satellite Division officers. See you at ION GNSS+ 2027!

09/21/2026

The Bradford W. Parkinson Award, awarded annually to an outstanding graduate student in the field of global navigation satellite systems (GNSS). This award, which honors Dr. Parkinson for his leadership in establishing both the U.S. Global Positioning System and the Satellite Division of the Institute of Navigation, was presented to Dr. Zachary Clements, The University of Texas at Austin, for his dissertation: GNSS Interference Detection and Geolocation.

09/21/2026

Johannes Kepler Award, sponsored by the Satellite Division of the Institute of Navigation to honor an individual for sustained and significant contributions to the development of satellite navigation during their lifetime, was presented during ION GNSS+ 2026 in Orlando, Florida, to Dr. Alison Brown for her sustained record of pioneering technical innovations, operational deployments, strategic leadership, and PNT community advancement.

08/13/2026

Heading to the Small Satellite Conference this month?

The Institute of Navigation will be there August 23-26 in Salt Lake City at Booth 8.

Add us to your list. Stop by to talk PNT, the NAVIGATION journal, and what's ahead at ION GNSS+ 2026 in Orlando.

We'd love to meet you.

08/12/2026

How long can a spacecraft keep watching a single pulsar before its own clock corrupts the measurement?

As missions return to the Moon and push deeper into space, navigation resources are stretched — the Deep Space Network is at times up to 40% oversubscribed. That has driven interest in autonomous alternatives like X-ray pulsar navigation (XNAV), which uses X-ray millisecond pulsars (MSPs) as signals of opportunity. But XNAV needs long integration times to form a usable measurement, and over those windows, error from the onboard clock accumulates unchecked.

Kyle J. Houser and Demoz Gebre-Egziabher (University of Minnesota) quantify how clock quality sets the limit on usable observation time. In a Monte Carlo simulation, a maximum-likelihood estimator (MLE) recovers phase and frequency from simulated photon arrival times corrupted by a two-state, frequency random walk clock error model. The estimator's error is compared against the Cramér–Rao lower bound (CRLB) across four oscillators — a TCXO, an OCXO, a Microchip SA65 chip-scale atomic clock (CSAC), and a cesium clock — using the pulsar PSR B1937+21.

In the authors' words: "How long can a pulsar be viewed without estimating or correcting clock errors before timing noise dominates the measurement?"

Each oscillator maps to a usable window: the TCXO is unsuitable, the OCXO holds for roughly 1,000–20,000 s, the CSAC stays converged to the CRLB until about 50,000 s, and the cesium clock is nearly indistinguishable from clean data. That distinction matters for small satellites, where a cesium clock is hard to fit within size, weight, power, and cost (SWAP-C) constraints.

Read the full open-access article in NAVIGATION:
https://doi.org/10.33012/navi.773

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