Switched array concepts for 3-D radar imaging

A number of antenna array concepts are investigated for three-dimensional radar imaging. The concepts are based on switched arrays and wide-band signals to generate a virtual array or co-array to span a sector volume in the wave vector space to get image resolution. The proposed arrays can be used for short range imaging in penetrating radar applications. This approach is quite general and it can also be used in other system concepts. Virtual arrays have mostly been used in radio astronomy and ultrasonic imaging. The related synthetic arrays with antenna motion have been more common in radar systems.