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Ultra-wideband radar target impulse response is characterized by few significant scatterers that can be directly associated with the target geometry such as wing tip, engine inlet, etc. Although there are few scatterers of interest, the UWB nature of the radar sensor requires extensive frequency domain measurements or highly sampled time domain signatures. This requirement is simply a consequence...
Multiple-input multiple-output (MIMO) radar is a multiple aperture technology characterized by the ability to transmit diverse signals at each aperture. This is in contrast to traditional phased-array radar whereby a single signal is transmitted with a phase shift applied at each element to enable steering of the transmit beam. The hybrid MIMO phased-array radar (HMPAR) concept is an outgrowth of...
This paper introduces an adaptive radar waveform technique where a standard LFM waveform is used as an initial seed. The seed waveform is changed using a phase-only adaptive technique to minimize the resulting waveform's power in specific areas associated with in-band and adjacent-band spectral regions. Adjacent-band power minimization reduces interference to other spectral users, while in-band power...
To reduce the need of secondary data and/or accurate prior knowledge of the clutter statistics in space-time adaptive processing (STAP), we present herein a user parameter-free and secondary data-free fully automatic weighted least squares based iterative adaptive approach (IAA) to angle-Doppler imaging for airborne surveillance radar systems.
Motivated by the echo-location system of a bat, I described the idea of cognitive radar in 2006 for the first time. This paper expands on this novel idea. In particular, the paper focuses on a cognitive tracking radar, the implementation of which comprises two distinct functional blocks, one in the receiver and the other in transmitter with a feedback link from the receiver to the transmitter. To...
We consider two Monte-Carlo based methods for characterizing the scattering function of rapidly-varying sea clutter. The first method uses multiple particle filtering to estimate the clutter space-time covariance matrix by exploiting the structure of the matrix. This method is then compared to a baseline approach that estimates the clutter covariance matrix based on the Weibull distribution approximation...
This paper outlines a space-time duality study started in 2003 and leading to a latency-information theory (LIT) that unifies information theory with a novel latency theory revealed as time-dual. While information theory guides the design of communication systems, latency theory does the same for recognition systems. A unified recognition-communication system is an intelligence system and LIT illuminates...
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