METHOD FOR STRUCTURAL-PARAMETRIC ADAPTATION OF A SPATIAL FILTER
DOI:
https://doi.org/10.15588/1607-3274-2020-3-2Keywords:
Аctive noise interference, spatial filter, structural-parametric adaptation, cancellation ratio.Abstract
Context. To protect radars from active noise interference (jamming) acting along the side lobes of the antenna pattern, spatial filtering is used, which is realized by using antennas that are placed apart in space. In this case, the difference in the directions of the useful signal reception and the interference reception makes it possible to form the optimal value of the weighting coefficients of the adaptive spatial filters for interference suppression. However, in the case where the source of interference is in the main lobe, the differences between the desired signal and the interference are reduced. This leads to significant distortion of the antenna main lobe pattern. As a result, the accuracy of angular coordinates measurement deteriorates, as well as the sensitivity of the receiving device.
Objective. The goal is to increase the radar operation efficiency under conditions of possible interference along the main lobe of the antenna pattern, both when the source of active interference moves in space, and when scanning the antenna system.
Method. The method is implemented by using both parametric adaptation of known spatial filters and structural adaptation of the interference protection system. The structure of the radar signal processing system is changed by the "on the fly" assessment of the interference direction. In this case, the control signal for structural adaptation is formed according to the magnitude of the current spatial filter weighting coefficient value.
Results. A block diagram of a spatial filter with structural-parametric adaptation of weight coefficients has been developed, which ensures efficient operation of a radar under conditions of active interference acting both along the side lobes of the antenna pattern and along the main lobe. The mathematical model of a spatial filter with structural-parametric adaptation has been developed. As a result of the simulation, the possibilities of increasing the accuracy of measuring the angular coordinates and the sensitivity of the receiving device of the radar been confirmed.
Conclusions. The scientific novelty of the research is the development of a new method of structural-parametric adaptation of the spatial filter. Such method provide the efficient radar operation under conditions of active noise interference both from the direction of the side lobes and from the direction of the main lobe of the antenna pattern.
The practical significance of the research is in the development of a block diagram of a spatial filter with structural-parametric adaptation, the development of a mathematical model and its testing.
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