A notional representation of a MPAR system performing surveillance in LOS situations, using RISs for NLOS search, as well as implementing a COM functionality.

A notional representation of a MPAR system performing surveillance in LOS situations, using RISs for NLOS search, as well as implementing a COM functionality.

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Multifunction phased array radars (MPARs) exploit the intrinsic flexibility of their active electronically steered array (ESA) to perform, at the same time, a multitude of operations, such as search, tracking, fire control, classification, and communications. This paper aims at addressing the MPAR resource allocation so as to satisfy the quality of...

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... this paper, a MPAR system equipped with an active ESA antenna is considered (see Fig. 1 for a notional illustration of the operating scenario). It is capable of performing multiple functions, e.g., just to mention a few, radar surveillance (search) in LOS scenarios, RIS-aided search in NLOS scenarios (a.k.a. detection over the corner), COM activities (possibly unidirectional) toward some users, tracking, and so on. To ...
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... respect to search ones. Solving Problem (1) with the above constraints results in the resource distribution reported in Fig. 9, where as before subfigures refer to a) LOS search, b) COM, and c) NLOS search tasks. More specifically, the allocated PAPs are equal to PAP = [74,138,275,84,75,72,37] T W·m 2 . To give insights into the obtained results, Fig. 10 shows for each task the optimal resource allocation in terms of PAP versus the R 90 (respectively R com ) together with the corresponding utility, with subfigures referring to a)-c) LOS search, d)-f) COM, and g) NLOS search operations. As expected, the RRM allocates PAP so that the maximum utility is reached for the Horizon search ...
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... concluding this case study, Fig. 12 shows the objective function (2) achieved by the proposed algorithm versus the utility value (assumed equal among the different tasks). As expected, the allocation performed by the RRM attains a global utility that reduces as the constraints become more and more demanding. ...
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... this situation, the PAP allocation is performed for a different set of priority weights, again setting its maximum value to 755 W·m 2 , i.e., half of that used under normal operational conditions. As a matter of fact, the priority weights Fig. 14 shows for each task the optimal resource distribution in terms of PAP versus R 90 (respectively R com ) together with the corresponding utility, with subfigures referring to a)-c) LOS search tasks, d)-f) COM tasks, and g) RIS-aided search task. As expected the RRM does not allocate any PAP to the COM tasks reflecting the associated ...
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... conducted test considers the availability of maximum PAP of 755 W·m 2 (that is again approximately the 50% of that under normal operational conditions in the case study 1), with the same priority weights as in the first case study. Solving Problem (1) with the above constraints results in the PAP assignment illustrated in Fig. 15, where subfigures refer to a) LOS search, c) COM, and d) RIS-aided search tasks. More in detail, the allocated PAPs are now equal to PAP = [74,157,287,54,54,56,73] T W·m 2 , respectively. Again, to further shed light on the results, Fig. 16 shows for each task the optimal resource allocation in terms of PAP versus R 90 (respectively R ...
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... case study. Solving Problem (1) with the above constraints results in the PAP assignment illustrated in Fig. 15, where subfigures refer to a) LOS search, c) COM, and d) RIS-aided search tasks. More in detail, the allocated PAPs are now equal to PAP = [74,157,287,54,54,56,73] T W·m 2 , respectively. Again, to further shed light on the results, Fig. 16 shows for each task the optimal resource allocation in terms of PAP versus R 90 (respectively R com ) along with their corresponding utility, with subfigures referring to a)-c) LOS search, d)-f) COM, and g) RIS-aided search tasks. It is now interesting to observe that the resource allocation does not follow the trend as in the scenario ...

Citations

... T HE advent of integrated sensing and communication (ISAC) systems marks a transformative era in military surveillance, essential for modern warfare [1]. The integration of ground, aerial, and space networks in the sixth-generation (6G) communications is a game-changer that delivers unmatched levels of global connectivity, low-latency communication, accurate sensing capabilities, and distributed task offloading [2]- [4]. ...
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... where SNR COM k is the signal to noise ratio (SNR) at the k-th COM user receiver. Hence, indicating with R k,COM the range at which the user is located, the SNR is given by [19] ...
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