Narrow band high resolution radar imaging

We present a technique for generating imagery with high spatial resolution but from low bandwidth radar transmissions. The high spatial resolution is obtained by applying the principles of tomography to a multi-site monochromatic continuous wave (CW) radar system that can illuminate the target over a complete angular range of 360 degrees. A simulation has been developed to investigate the technique. Further, full-scale imagery of corner reflector and vehicle targets derived from an ISAR data collection has been modified to emulate and examine the performance of a multi-static monochromatic CW system. The approach also provides valuable insight into the fundamental resolution limits possible in microwave imaging. It is shown how resolution can be improved beyond the limits normally attributed to the SAR and ISAR forms of imaging. In fact, there is no theoretical limit of the resolution of the sensor.