Synthetic Aperture GPS Signal Processing

http://www.insidegnss.com/auto/mayjune09-soloviev.pdf

I found this article fascinating. Synthetic aperture techniques have
been applied to imaging radars since at least the 1980's when NASA
flew one on the space shuttle. The concept is simple.

Effectively, a series of observations are combined just as if they had
all been made simultaneously from a very large antenna; this process
creates a synthetic aperture much larger than the length of the
antenna. It also allows you to create a beam whose width is
proportional to the number of array elements. You can create the
illusion of a large array by moving a single antenna, say in an
airplane or land vehicle.

http://en.wikipedia.org/wiki/Synthetic_aperture_radar

Look at what you can do by applying synthetic aperture techniques to
GPS.
1. Avoid jamming by making an omnidirectional GPS antenna directional
2. Use GPS to create a SAR image!

Cool.

--Mike Jr