ABSTRACT
Reception ................................................................................................................... 11 1.6.3 Conclusions on Gaussian Pulse Signal Propagation .......................................... 14
1.7 UWB Radar: Future Trends and Applications ................................................................ 15 1.7.1 Open-Space Measurement and Surveillance ....................................................... 15 1.7.2 Material-Penetrating Remote-Sensing Application ............................................ 15 1.7.3 Medical Measurements and Imaging ................................................................... 16 1.7.4 Security ...................................................................................................................... 16 1.7.5 Military Remote-Sensing Applications ................................................................ 16
1.8 Future Directions in UWB Radar Development ............................................................. 16 1.8.1 Optimization of UWB Antenna Array Geometry .............................................. 16 1.8.2 Synchronization of Antenna Array Signals ......................................................... 16 1.8.3 Improvements in Receiver Signal-to-Noise Ratios ............................................. 17 1.8.4 Multistatic Radar ...................................................................................................... 17 1.8.5 Higher Order Signal Processing to Augment Imaging and Target
IdentiŽcation ............................................................................................................. 18 1.9 Architecture of Future UWB Radars ................................................................................ 18 1.10 Conclusions ........................................................................................................................... 19 References ....................................................................................................................................... 20
1.1.1 Concept of Ultrawideband Radar
The term ultrawideband (UWB) describes a radar system with an effective signal bandwidth that is a large percentage of the center frequency (20%–25%). This wide bandwidth gives the radar systems a small spatial resolution (centimeter to millimeter) measurements and good imaging capabilities. UWB radars use a variety of signal formats, including short-duration pulses (impulses), random noise signals, step frequency coding, and pulse sequence coding, to achieve wide bandwidths. The Žne spatial resolution of these radars can provide precision-range measurements for locating and imaging applications. In the following chapters, you will Žnd examples of UWB radar systems in special applications requiring Žne spatial resolution measurement and in penetration of materials for construction, geophysical surveying, security, and medical purposes [1,2].
