Abstract
With the rapid development of cooperative detection technology, target fusion detection with regard of LEO satellites can be realized by means of their diverse observation configurations. However, the existing constant false alarm ratio (CFAR) detection research rarely involves the space-based target fusion detection theory. In this paper, a novel multi-source fusion detection method based on LEO satellites is presented. Firstly, the pre-compensation function is constructed by employing the range and Doppler history of the cell where the antenna beam center is pointed. As a result, not only is the Doppler band broadening problem caused by the high-speed movement of the satellite platform, but the Doppler frequency rate (DFR) offset issue resulted from different observation configurations are alleviated synchronously. Then, the theoretical upper and lower limits of DFR are designed to achieve the effective clutter suppression and the accurate target echo fusion. Finally, the CFAR detection threshold based on the exponential weighted likelihood ratio is derived, which effectively increases the contrast ratio between the target cell and other background cells, and thus to provide an effective multi-source fusion detection method for LEO-based satellite constellation. Simulation results verify the effectiveness of the proposed algorithm.
Highlights
With the rapid development of cooperative detection technology, target fusion detection with regard of LEO satellites can be realized by means of their diverse observation configurations
The target velocity is 20 knots, and its direction deviates from the x axis by 45 degrees in the clockwise direction. While the latter requires that the multi-source echoes can be integrated to the same cell, Figure 8 illustrates the relationship between the target velocity and the optional interval of ∆ f dr, in which the optional interval of ∆ f dr is located between the dotted line and the solid line, and the constraint interval of ∆ f dr gradually relaxes with the increase of the target velocity
The target focusing positions with different LEO satellites do not coincide at one cell in Doppler frequency rate (DFR) domain as a result of the highspeed motion platform, which can be solved by constructing the pre-compensation function based on the antenna beam directivity
Summary
With the rapid development of cooperative detection technology, target fusion detection with regard of LEO satellites can be realized by means of their diverse observation configurations. The CFAR detection threshold based on the exponential weighted likelihood ratio is derived, which effectively increases the contrast ratio between the target cell and other background cells, and to provide an effective multi-source fusion detection method for LEO-based satellite constellation. For LEO-based satellite constellation, with the maturity of lightweight, standardized, low-cost development pattern as well as the rapid layout of different types of satellite echoes, i.e., communication, navigation and radar [1,2], multisource fusion detection technology becomes a feasible means for reliable target detection, in which multi-station joint detection strategy is adopted to make full use of the advantage of multi-angle energy accumulation.
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