engineering Archives - Page 2 of 12 - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design


May 29, 2016

GNSS Antennas with Dr. Inder Gupta

Dr. Inder Gupta, The Ohio State University
Chris Bartone, Ohio University

GNSS receivers seem to get all the attention. Go to any technical GNSS conference and the lion’s share of presentations are about receiver design and techniques: better algorithms, signal processing, integration with other sensors, spoofing detection, and on and on.

Read More >

By Inside GNSS
March 27, 2016

Sandy Kennedy’s Compass Points

Return to main article: Sandy Kennedy: Here to Stay


Engineering specialties

Algorithm development, Kalman filtering, GNSS/INS integration, digital signal processing, embedded software, system integration

Favorite equation

Kennedy really likes the foundational differential equation, the basis of Kalman filtering, because it can become so many different things:

Read More >

By Inside GNSS
March 18, 2016

Sandy Kennedy: Here to Stay

Sandy Kennedy and her husband Arlin Amundrud

>>Sandy Kennedy’s Compass Points

Sandy Kennedy grew up in Miami. Miami, Manitoba, Canada, that is — a town of 150 people with a school, a café, a defunct railroad station, and an ice skating rink.

Now she’s director and chief engineer in charge of receiver core cards at NovAtel Inc., a developer and manufacturer of high-precision GNSS products headquartered in Calgary, Alberta. It’s a long way from where she started, but then again, maybe not.

Read More >

By Inside GNSS
February 8, 2016


The Saint Louis Cathedral, New Orleans, Louisiana

AUVSI’s Unmanned Systems conference and trade show is now XPONENTIAL.

XPONENTIAL 2016 will take place at the Ernest N. Morial Convention Center in New Orleans, Louisiana, U.S.A. from May 2 – 5, 2016.

Read More >

By Inside GNSS
November 19, 2015

How Important Is It to Synchronize the Code and Phase Measurements of a GNSS Receiver?

Q: How Important Is It to Synchronize the Code and Phase Measurements of a GNSS Receiver?

A: Precise timing lies at the heart of GNSS implementation and operation and is generally well understood in terms of synchronizing individual satellites and/or receivers. Recent results, however, have demonstrated that timing of code and phase measurements in a receiver can have significant implications for the timing community in particular.

Read More >

By Inside GNSS
September 7, 2015

Alternative PNT

At one time, GPS was expected to supplant a wide range of navigation technologies in the world’s positioning, navigation, and timing (PNT) portfolio. But an unexpected thing happened along the way.

Read More >

By Inside GNSS

John Raquet: A Family Affair

John and his wife, Cindy.

John Raquet’s Compass Points

With an imposing 6’2” physique and a disarming grin, John Raquet rises above the crowd. To colleagues he’s a top-flight engineer and university professor, and director of the Air Force Institute of Technology (AFIT) Autonomy and Navigation Technology Center. But he is also a former all-star basketball player, a preacher, sometime soccer coach, former military officer, and, most definitely, a family man.

Read More >

By Inside GNSS
July 20, 2015

Can you list all the properties of the carrier-smoothing filter?

Q: Can you list all the properties of the carrier-smoothing filter?

A: Carrier-smoothing filters, also known as Hatch filters, are commonly used to reduce (“smooth”) the noise and multipath errors in pseudorange measurements by exploiting the high-precision relative distance information from carrier phase measurements. However, carrier-smoothing filters operate on more than just noise and multipath, and this article summarizes the response of such filters to all relevant inputs.

Read More >

By Inside GNSS
May 20, 2015

Thinking Small

Equations 2, 7, 8, 9, 10 & 11

Unmanned aerial vehicles (UAV) are finding increased application in both domestic and governmental applications. Small UAVs (maximum take off weight less than 20 kilograms) comprise the category of the smallest and lightest platforms that also fly at lower altitudes (under less than 150 meters).

Designs for this class of device have focused on creating UAVs that can operate in urban canyons or even inside buildings, fly along hallways, and carry listening and recording devices, transmitters, or miniature TV cameras.

Read More >

By Inside GNSS