Abstract
A new method to address radar target detection problems in multipath environments is considered. The novelty of the proposed method is that it exploits prior knowledge on the environment and combines it with ray-tracing electromagnetic modelling to determine some information about the possible multipath structure. This information is used to separate the environment into different regions based upon the behaviour of the multipath components. Specifically, as a case study, the authors consider a radar and a target in the presence of a perfectly reflecting planar surface. For this environment, three regions are determined based on the amount of overlap among the multipath components. For each region, receivers are designed exploiting the multipath structure. Thus, a different viewpoint to analyse radar detection problems is suggested. The two main results are the improvement in the target probability of detection, by properly accounting for the multipath and a priori determination of the best performing detector based upon the location of the target and the available signal-to-noise ratio.
Highlights
This work is focused on improving the probability of detection of a radar target by taking advantage of prior knowledge of the radar-target environment and devising appropriate detectors based upon the region where the target is located
The improvement is computed with respect to a conventional detection problem based on a model of the return signal that accounts only for the direct signal from the target
We considered the detection of a target by a radar in a multipath environment
Summary
This work is focused on improving the probability of detection of a radar target by taking advantage of prior knowledge of the radar-target environment and devising appropriate detectors based upon the region where the target is located. Radar detection problems are still challenging in all environments where multipath effects are present, notwithstanding the fact that they have been widely studied through advanced electromagnetic (EM) modeling [1], [2]. Our work considers diverse receiving strategies by exploiting prior knowledge of the radar-target environment through advanced EM modeling of the corresponding multipath structure. A qualitative analysis is provided for the improvement in the target probability of detection via multipath exploitation when the multipath components are distinguishable and partially overlap in the time-domain. Preliminary results were presented in [18]–[20]
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