Project Award Date: 11-30-2005
The electromagnetic spectrum has become increasingly crowded in recent years as a result of the demand for higher bandwidths. Efficient use of bandwidth is essential to meet the needs of a wide variety of technological disciplines. Waveform design and diversity for sensor and communication systems has been recognized as being fundamental to fully utilizing the capacity of the EM spectrum and thereby enabling the realization of the DoD's "Joint Vision 2020" goal of full spectrum dominance. As a result, there are emerging and compelling changes in system requirements such as more efficient spectrum usage, higher sensitivities, greater information content, improved robustness to errors, reduced interference emissions, etc.
For radar applications perhaps the greatest challenges to attaining high spectral efficiency are the need for spectrally clean emissions that minimize the out-of-band interference and the complementary need for advanced receiver designs to enable the separation and processing of multiple radar and communications signals that mutually interfere with one another. In essence, instead of dealing with interference as simply a deleterious effect, it can be exploited as additional sources of information without the requirement of additional bandwidth. The potential application is to facilitate joint multistatic radar / multiuser communications which possess some degree of spectral overlap with the capability of accurately separating the multitude of signals at a receiver according to their respective modulations, polarizations, angle- of-arrival, etc. Besides considerably greater spectral efficiency, this capability would also enable sensor networking, aspect angle diversity, greater area coverage with shorter revisit times, anti- stealth sensing capability, enhanced Identify Friend or Foe (IFF), more flexibility in resource management, as well as numerous others.
This research will result in advances in fundamental theories and algorithms for the analysis and design of adaptive transmitters and receivers for multi static sensors. The research will provide insight into the development of novel capabilities for waveform-diverse sensors whereby the role of friendly RF interference can be shifted from being a source of performance degradation to being a means of obtaining additional information about the environment thereby enabling substantial improvements in surveillance capabilities. Such improvements cannot be accomplished through clever spectrum allocation techniques but instead require novel ways in which to process the information obtained from the environment.
Primary Sponsor(s): Office of Naval Research