S.P. Barinov¹, Y.I. Maevskii², D.I. Prudnikov³

¹‧³JSC "KNIRTI" (Zhukov, Kaluga Region, Russia)

²JSC "KRET" (Moscow, Russia)

¹‧³knirti@obninsk.com

As a typical operating condition, we considered a presence of active jamming generated to main and/or side lobes of antenna beam pattern (ABP) by several generally partially-coherent sources. One of the most effective types of interference for mono-pulse direction finder is coherent interference providing considerable error rate increase and (in some cases) angle-track-on-target failure. Earlier studies usually ignored effects relevant to application of threshold logic (angular strobing) of target selection by angular deviation from scan axis in radar goniometric channel. According to this logic, angular coordinates measurements are considered to be correct and markings are considered to be true if their angular deviation from scan axis is not exceeding the certain threshold corresponding generally to the edge of linear section of directional characteristic of measuring instrument. Otherwise, measurements are considered to be incorrect and target processing is stopped (is not sent to secondary processing). In addition to this, the certain papers incompletely considered effects associated with mutual partially-coherent interference compensation when phase difference approaches 180°.

Objective – determination of Probabilistic characteristic of radar with mono-pulse direction finder (in which interference protection circuit of angular strobing type is implemented) in partially-coherent interference environment.

We chose a probability of sending the target indication to secondary processing (defined as a product of signal detection probability by signal selection probability in angular coordinates measuring instrument) as a radar operating performance ratio.

Using the methods of statistical radio-technics, we developed the methodology of estimations of probability of sending the target indication to secondary processing allowing to consider the effects associated with mutual partially-coherent interference compensation when phase difference approaches 180°, and circuit for selection of an angular strobing type in mono-pulse direction finder.

We made estimations and demonstrated that probabilistic characteristic of radar with mono-pulse direction finder (in which interference protection circuit of angular strobing type is implemented) are essentially depend on space-energy parameters and phase parameters of partially-coherent interferences. Therewith, the probability of sending the target indication to secondary processing is defined by the probability of target indication selection in mono-pulse angular coordinates measuring instrument and approaches to zero, despite of mutual partially-coherent interference compensation in the range of interference signals phase difference that are close to 180°.

Barinov S.P., Maevskii Y.I., Prudnikov D.I. Probabilistic characteristic of radar with mono-pulse direction finder in partially-coherent interference environment. Radioengineering. 2025. V. 89. № 11. P. 124−130. DOI: https://doi.org/10.18127/j00338486-202511-14 (in Russian)

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