8.1 Acceleration Compensation by Matched Filtering
By: Kapriel V. Krikorian and Robert A. Rosen
Raytheon Company | Abstract: High radar sensitivities are required in the detection of small cross section targets or in ECM environments. An effective way of improving the radar sensitivity is to use long coherent integration times. Results of the work to be presented include studies of target decorrelation using actual magnitude/phase flight test data from aircraft and the resolution of the "filter fly-through" problem due to translational acceleration. The acceleration compensation technique described in this radar generates matched filters that compensate for each acceleration. The matched filters optimize the signal-to-noise ratio by weighting and combining the doppler filters over which the target is spreading. Both coherent and non-coherent matched filters can be formed [1] This provides direct and precise measurement of target acceleration for enhanced detection and tracking of maneuvering targets. |
8.2 Multilateration Tracking and Synchronization Over Wide Areas
By: Y. Eric Yang, J. Baldwin, and A. Smith
Rannoch Corporation | Abstract: In this article, we study technical issues involving wide-area surveillance system using multilateration sensors. A satellite clock reference scheme is seen as a better solution for synchronization of widely dispersed sensors. We then described a direct solution approach to derive target positions. Techniques are developed for resolving solution ambiguities, including different sensor combinations and tracking algorithms. It is also proposed that signal strength comparison and other techniques be used to enhance tracking performance and accuracy with Mode A/C data. Finally, some recent flight test results are shown to demonstrate the feasibility of multilateration system for wide-area surveillance. |
8.3 Superresolution with Conformal Broadband Antenna Arrays
By: Josef G. Worms
FGAN-FHR, Germany | Abstract: In this paper we discuss spatial superresolution methods applied to the received data of a conformal array antenna. The "Sequential MUSIC" and the "Sequential Alternating Projection" methods are derived. Besides the angles of arrival we estimate additionally the polarization states of the received signals. The theoretical derivations are verified and experimental results are shown. Future multifunction radars using array antennas will be agile in time and frequency. The only radar parameter, which can not be changed in short time intervals, is the radar position. Applying sensor and data fusion techniques the main mode of many future radars will be a passive listening mode. To fulfil the necessary radar tasks passive target localization methods are becoming more important. In this paper we discuss spatial superresolution methods applied to the received data of a conformal array antenna. |
8.4 Multiple Target DOA Estimation by Exploiting Knowledge of the Antenna Main Beam Pattern
By: Alfonso Farina
Alenia-Marconi Systems
and: Fulvio Gini and Maria Greco
Universita di Pisa | Abstract: We propose a new approach to the estimation of the direction of arrival (DOA) of multiple radar targets present in the main lobe of a mechanically rotating antenna. The method is based on the maximum likelihood (ML) technique and it exploits knowledge of the antenna beam pattern. Two scenarios are considered: multiple targets with deterministic unknown complex amplitudes, and multiple targets with random complex Gaussian distributed amplitudes. The performance of the proposed estimator is assessed through Monte Carlo simulation and compared with the Cramér-Rao lower bound. |