Abstract
The development of the direct digital method of correlative-interferometric direction finding with two-dimensional correlative processing of the reconstructed complex spatial signal in the aperture of linear antenna array was conducted. The estimations of directions towards the radio sources are obtained through the use of a two-dimensional frequency domain of determination and a two-stage processing, which enables the direct correlative analysis with minimal computing expense. At this point, the direct estimation of directions towards the sources of casual radio emissions, which spectra are fully overlapped by frequency, is performed in real time by reconstructing of the complex spatial analytical signals, their spatial selection and dispersive-correlative processing. As a result of simulation, the dependence family of mean square deviation of estimation of direction from the direction of the source of radio radiation for different signal/noise ratios is obtained. The analysis showed that the examined method provides a higher accuracy of direction finding in comparison with the known method in a wide sector of directions, but it has lower computation costs and provides a significant speed increase of direction finding. It is shown that the direction finding in the sector 360 degrees with an error of less than 0.04 degrees, when the input signal/noise ratio of 0 dB, is possible by using two antenna arrays. The possibility to ensure the resolution of 8 degrees or less at a signal/noise ratio of 0 dB, which is an important advantage in a complex electromagnetic environment is also shown.
Highlights
The direction finding of radio electronic devices is carried out in a complex electromagnetic environment (EME), which is characterized by multipath propagation of radio emissions and by frequency coverage of the desired signal and the intrusive noises, of a priori uncertainty relative to the parameters of radiations
The aim is to develop and to study the high-speed digital direction finder with a spatial selection and two-dimensional correlation processing of signals. To achieve this goal the following tasks were solved: – the development of the direct digital correlation-interferometric method of direction finding with the parallel spatial selection of signals and with two-dimensional correlation processing, which has the lowest computational cost; – the study of accuracy and the width of the working sector of direction finding by simulation
We conducted the software simulation of the direction finder according to the developed direct algorithm (24), (25) of the correlative-interferometric direction finding via the developed software model in MathCad environment
Summary
The direction finding of radio electronic devices is carried out in a complex electromagnetic environment (EME), which is characterized by multipath propagation of radio emissions and by frequency coverage of the desired signal and the intrusive noises, of a priori uncertainty relative to the parameters of radiations. The most plausible unbiased assessment of estimation of directions to the sources of radio radiation (SRR) is based on the search of a sequential correlational analysis and the review of the space This fact greatly limits their performance and requires a lot of hardware expenditure of data processing systems, reducing the effectiveness of their application to the dynamic conditions of EME [1]. The disadvantage of this method is a low exactness of direction finding of SRR, which spectra are completely overlapped by frequency. For the use in the automated radio monitoring systems the development and the research of fast-acting digital methods of correlation and interferometric direction finding is an urgent task
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