“If a tree falls in a forest and no one is around to hear it, does it make a sound?” is a philosophical thought experiment that raises questions regarding observation and perception [Source: Wikipedia]. Setting aside the philosophical aspects, if one wasn’t present where a sound was generated, the sound was lost forever.… Read More
One meaning of the word “reckoning” says it is the action or process of calculating or estimating something. But dead reckoning? What does that mean? Believe it or not, we have all deployed dead reckoning to varying degrees of success on different occasions. As an example, when driving on a multi-lane winding highway and direct … Read More
GNSS is a wonderful invention, and low cost receivers have crept into smartphones and other mobile devices. However, GNSS does not solve all problems, especially in urban environments. The canyon effect blocks signals at street level between tall buildings, and signals do not penetrate to the interior of parking garages, tunnels,… Read More
