D.V. Bogomaz1, Е.Е. Smirnov2, А.А. Petrovsky3, N.А. Khodataev4
1,2 Military Space Academy named after A.F. Mozhajskij (St. Petersburg, Russia)
3 JSC «Radiotechnical Institute named after academician A.L. Mints» (St. Petersburg, Russia)
4 JSC «Concern «Radio Engineering and Information Systems» (Moscow, Russia)
Modern algorithms for searching for sources of active interference for the most part solve the problem of searching for maxima on a direction finding relief. But, since the interference relief is formed together with the antenna pattern, the direction to the source of active interference may differ from the maximum direction-finding relief.
The algorithm proposed in the article for searching for sources of active interference is designed to determine their angular coordinates on the direction-finding relief by the method of diagram similarity.
The direction finding relief is formed in the search area by moving the beam pattern along predetermined nodal points (nodes) and measuring the power level of the signal received in each of them. In addition to angular coordinate characteristics u and v, each node also has power value p. A set of power values (nodes) obtained in a given search area forms a direction finding relief.
Direction finding relief, as a rule, has pronounced maxima, which indirectly indicate the location of sources of active interference. Thus, the task of their direction finding is reduced to analyzing the group of nodes of direction finding relief corresponding to the selected maximum (direction finding group) and finding the possible position of the source of interference relative to the selected direction finding group.
Search of position of sources of active interference is carried out by displacement of direction finding group relative to previously calculated and normalized by maximum value of power in nodes of group within beam pattern. The offset value is calculated in advance based on the specified accuracy. For each position of the direction finding group, the difference between the power value of each node and the beam level corresponding to that node is calculated. The squares of the resulting values add up. The sums obtained for each position of the direction finding group characterize the influence of interference taking into account its location relative to the nodes of the group. The position at which the resulting sum is minimal will indicate the location of the active interference sources relative to the direction finding group. Thus, knowing the location of the sources relative to the direction finding groups and knowing the location of the groups relative to the direction finding terrain as a whole, the angular coordinates of the interference sources are calculated.
Thus, by applying the diagram similarity method, it is possible to determine the position of the sources of active interference.
Bogomaz D.V., Smirnov Е.Е., Petrovsky А.А., Khodataev N.А. Algorithm for finding sources of active interference on direction finding relief using diagram similarity method. Achievements of modern radioelectronics. 2022. V. 76. № 2. P. 16–22. DOI: https://doi.org/10.18127/j20700784-202202-02 [in Russian]
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