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The utilization of diversity in radar systems has shown improvements over conventional beamforming phased array radars in many aspects of the system performance including target detection probability, the number of identifiable targets, and beam-pattern synthesis. When linearly independent signals are transmitted, the signals received from targets at different locations are also linearly independent...
Cross-correlation based image subtraction for detection of targets within an urban structure from synthetic aperture radar images is presented. In surveillance operations requiring re-imaging of the same scene, small displacements in array element locations may cause large phase and amplitude offsets. Subsequently, clutter will not cancel out, but will rather persist when subtracting two images, one...
This paper considers the problem of high-resolution imaging of the environment formalized in terms of a nonlinear ill-posed inverse problem of nonparametric estimation of the power spatial spectrum pattern (SSP) of the wavefield scattered from an extended remotely sensed scene (referred to as the scene image) via processing the discrete measurements of a finite number of independent realizations of...
The noise radar concept can be extended to an array of K transmit antenna and M receive antenna. When independent noise sources are transmitted from each antenna the approach may be viewed as a special case of MIMO radar and matched filters may be derived. In this contribution statistical properties of matched filters for MIMO noise radar are derived. For any array the concepts of the sum and difference...
In this paper, space-time adaptive processing (STAP) for clutter rejection in airborne radar is considered using a uniform circular antenna array. Indeed, this technique is usually employed in case of a uniform linear antenna array while the advantages of a circular antenna were recently highlighted [2]. Our contribution is two fold. We first analyze the effects of a circular antenna on the clutter...
With the advent of new forms of true time delay wideband beamformers -both photonic and digital-the effect of noise within the beamformer channels must be taken into account. As an example, in this paper, a multibeam photonic beamformer for a phased array working in receive mode using linear frequency modulated pulses is analyzed. A general expression is obtained showing the effect of the optical...
In calculating the antenna system noise temperature the question always arises as to how to account for the antenna mismatch. In this paper it is shown that the antenna mismatch introduces another term into the antenna system temperature equation. This term increases the system temperature. It is due to the reflection of the noise coming out of the receiver in the direction of the antenna that is...
Knowledge about the lateral target length may be useful in several applications such as convoy tracking and alerting a high resolution imaging mode for classification. We focus on the estimation of the apparent length of an extended target with particular emphasis on convoys of ground vehicles. The estimation is done by applying generalised power estimators to the output signals of an array antenna...
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