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Multifunction radars (MFR) have to achieve their capability requirements in an increasingly complex environment, populated with diverse and hostile targets (e.g. low RCS, low speed targets in clutter or high speed, ballistic targets) in saturating scenarios (due to e.g. RF interference or threats). These radar systems are increasingly exploiting active electronically scanned array (AESA) technology...
We propose to use new shortest path computation methods based on Front propagation with Level Set approach for a radar application. This new radar function consists in computing most threatening trajectories & corridors in the radar coverage in order to adapt radar modes for detection optimization. This Radar problem may be declined as a variationnal problem solved by calculus of variations and...
We develop a new geometric approach for radar target detection which is based on the notion of Riemannian median and the information geometry of covariance matrices. First of all, we give the definition of Riemannian median and a simple algorithm to compute it. After that, the explicit expressions of reflection coefficients parametrization of covariance matrices are obtained, with which the Riemannian...
To assess maturity and capability of X-band radars to monitor wake roll-ups in all weather conditions, Radar data were collected on airports, near runway at ORLY airport and just under its ILS Interception Area. Additional trials took place on Paris-CDG Airport to benchmark Lidar & Radar Technologies. Continuous Detection, characterization and profiling capabilities of wake vortices, up to a range...
A method for modeling and tracking convective clouds within radar images is presented. An object modeling approach is used, based on the extraction of either morphological or grayscale skeletons from 2-dimensionnal cross-section of 3-dimensional radar data. Grayscale skeletons are appropriate shape descriptors for non-rigid and heterogeneous objects, in which gray-level local maxima correspond to...
In order to improve the capacity of airports in view of the expected increasing amount of traffic the knowledge about the safety issues caused by wake vortices has to be improved. The final goal is to build up a wake vortex alert system to ensure the application of appropriate but not oversized safety distances in all weather conditions. Lidar systems are able to deliver very accurate data, but are...
The capabilities of modern multifunction/mission Radar can be only fully realized by using new sensor control strategies and the most obvious sensor management imperative is the development of optimal realtime waveform scheduling algorithms. For this purpose, Thales is studying Intelligent Radar Time Resources management for Multi-mission extended air Defence radar used for both Air and Ballistic...
In this paper, we will address one key issue for radar load regulation related to dwell priority assignment of Search Domains. Threat Level of search beam position is based on density map of most threatening trajectories (penetration corridors). We studied properties of these trajectories so as to find theoretical results (existence or unicity) and also search algorithm which would be able to compute...
With new generation of Active Digital Radar Antenna, there is a renewal of waveform generation and processing approaches, and new strategies can be explored to optimize waveform design and waveform analysis and to benefit of all potential waveform diversity. Among these strategies, building and exploitation of the Noncircularity of waveforms is a promising issue. Up to the middle of the nineties,...
New operational requirements for stealth targets detection in dense & inhomogeneous clutter are emerging (littoral warfare, low altitude asymmetric threats, battlefield in urban area...). Classical radar approaches for Doppler & array signal processing have reached their limits. We propose new improvements based on advanced mathematical studies on geometry of SPD matrix (symmetric positive...
In this paper, we consider the problem of using space-time adaptive processing (STAP) in ground-based rotating radars, in the case where no jamming alone reference is available. Thus, we propose the use of a STAP algorithm, in which adaptive processing is applied in beam post-Doppler space. First, we give design rules for the implementation of this processing, after considering two cases depending...
In order to improve the capacity of airports in view of the expected increasing amount of traffic the knowledge about the safety issues caused by wake vortices has to be improved. The final goal is to build up a wake vortex alert system to ensure the application of appropriate but not oversized safety distances in all weather conditions. Lidar systems are able to deliver very accurate data, but are...
In this paper, we present an original generalization of the CFAR technique . The technique of CFAR consists in testing two alternative assumptions ldquopresence of targetrdquo versus ldquoabsence of targetrdquo in a distance-azimuth cell called ldquocell under testrdquo. In the case where the noise is Gaussian and additive, one can show that the CFAR is equivalent to withdraw from the signal under...
Summary form only given. The capabilities of modern military multifunction/multi-mission/multi-role radars cannot be fully realised by using older sensor control strategies, due to the advance in radar technology and the complexity of the tactical environment. The most obvious radar management imperative is the real-time optimisation of radar functionality & radar resource management to meet the...
With new generation of Active Digital Radar Antenna, there is a renewal of waveform generation and processing approaches, and new strategies can be explored to optimize waveform design and waveform analysis and to benefit of all potential waveform diversity. Among these strategies, building and exploitation of the Noncircularity of waveforms is a promising issue. Up to the middle of the nineties,...
The main challenge of future phased array multifunction radar will be to optimise the radar time budget to avoid deleterious overload effects. For this purpose, we propose a new technique for priority assignment of Search Domains. Then, we have developed new algorithms for most threatening trajectories computation based on Calculus of Variations approach developed for "shortest path computation"...
The main challenge of future phased array multifunction radar will be to optimise the radar time budget to avoid deleterious overload effects. For this purpose, we propose a new technique for priority assignment of search domains. For that purpose, we have developed new algorithms for most threatening trajectories computation based on calculus of variations approach developed for "shortest path...
In order to improve the capacity of airports to handle the expected increasing amount of traffic, the knowledge about the safety issues for wake vortexes mitigation has to be improved. Currently, safety distances are very conservative and depend only on category size of aircrafts, without taking into account local wind nowcasting. The final goal is to develop a Wake Vortex Alert System for controllers...
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