Sam Pullen, Author at Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

Latest Articles

March 7, 2022
Q: How could GNSS users determine in real time that their received navigation signals are correct? What methods are recommended, and when might they go into operation?

Cryptographic techniques can optimize the trade-off between authentication integrity (minimizing the probability of authenticating a modified message), ease of modification of existing signals…

By Sam Pullen

February 5, 2021
How can the parameters given in the most recent GPS Standard Positioning Service (SPS) Performance Standard (SPS PS) be used to quantify the performance of GPS applications?

The value of the GPS SPS PS goes far beyond the specific parameters that it contains. It has a great deal of information…

By Sam Pullen

October 5, 2020
Can Analytical Techniques Guarantee That GNSS Errors Are Bounded Under Rare Conditions? What Techniques Are Available?

Research has focused on methods to analytically determine bounding probability distributions and parameters and identify the conditions under which such bounds are guaranteed…

By Sam Pullen

January 26, 2020
What freeware or open-source software packages are available to support GNSS performance evaluations?

In the years since civil and commercial use of GPS and GNSS became common in the mid-1990s, a variety of software tools have…

By Sam Pullen