I perform functional formulations and algorithm generation plus validation for both simulation and operational purposes in system integration. Read more

Questions submitted by members of various forums, understandably, frequently involve one or more of the following topics:  * some or all facets Read more

  At ION GNSS 2011 in Portland OR, Javad Ashjaee, James L. Farrell and others participated in a panel discussing the U.S. Dept. of Homeland Read more

Before GPS took over so many operations by storm (e.g., navigation,tracking, timing, surveying, etc.), designers had access to other -- far less Read more

The number of runway incursions, as shown on an FAA URL  was nearly a thousand in FY 2011 and 1150 for FY 2012.  A subsequent article shows Read more

A 1996 crash that killed U.S. Commerce Secretary Ron Brown drew attention to a problem that has caused thousands of airline fatalities. Read more

Tracking acceleration dynamics by GNSS, radar, imaging My 2007 book on GPS and GNSS (GNSS Aided Navigation & Tracking), as its title implies, Read more

GPS and GNSS Check out a preview of “GNSS Aided Navigation & Tracking” (click here) GNSS Aided Navigation & Tracking - Inertially Read more

Schuler cycles distorted -- Here's why A 1999 publication I coauthored took dead aim at a characteristic that received far too little attention Read more

GPS Carrier Phase for Dynamics ? The practice of dead reckoning (a figurative phrase of uncertain origin) is five centuries old.   In its Read more

In January of 2005 I presented a paper "Full Integrity Test for GPS/INS" at ION NTM that later appeared in the Spring 2006 ION Journal.  I've Read more

GPS codes are chosen to produce a strong response if and only if a received signal and its anticipated pattern are closely aligned in time. Read more