Implementation of 1D/2D/3D sensor data fusion in CASE_ATTI test-bed

摘要

Fusion problem of dissimilar sensor data in the CASE_ATTI test-bed is considered. The sensors suite simulated includes an ESM sensor that reports bearing-only contacts, a 2D radar that reports range-bearing contacts, an IRST sensor that reports bearing-elevation contacts, and a 3D radar that reports full 3D contacts. To fuse all this information, CASE_ATTI is modified into a two-layer fusion architecture, with four sensor-level trackers and a central fusion node. Therefore, the fusion of all the dissimilar 1D, 2D and 3D tracks represents an important problem that this paper addresses. The important and directly related issue of tracking with angle-only reports is also addressed. The angle-only tracking represents an important issue in modern surveillance systems and has been extensively studied in recent years. Angle-only tracking systems are known to be unobservable unless the interceptor over-maneuvers the target. A divergence of the target state estimate may occur in the case of stationary or non-maneuvering interceptor. In this article, a new time alignment algorithm, that enhances stability, even for non-maneuvering interceptors, is developed. The proposed algorithm is based upon the modified spherical coordinate representation, but uses a different discretization approach that leads to a more stable behavior. Comparative scenario that illustrates the efficiency of the proposed architecture is presented.