G.V. Ershov

JSC «Central Radio-Research Institute named after academician A.I. Berg» (Moscow, Russia)

While interception of high-speed objects during active phase of their flight becomes nowadays possible a necessity to develop means of their protection arises. One appropriate method consists in deploying of spatial-distributed system that includes many parachuted jamming sub-systems. To provide a required protection effectiveness for changing weather conditions one has to correctly evaluate number of parachuted jamming sub-systems.

The purpose of this paper is to evaluate more accurate number of parachuted jamming sub-systems when influence of precipitation on propagation of noise signal radiated by a jamming sub-system takes place.

To fulfil this, two main factors must be taken into account: attenuation of noise signal radiated by a jamming sub-system when it propagates through rain and its reflection and scattering on air/rain interface formed by a canopy of a parachute.

For standard distances between radar and parachuted jamming sub-system attenuation of noise signal in rain is nearly one. Therefore, in the case under consideration this effect can be neglected.

Thus, to evaluate number of parachuted jamming sub-systems capable to provide a required protection effectiveness of a high-speed object when only reflection and scattering of noise signal on air/rain interface takes place a Monte-Carlo method was used.

As a result, to provide in rainy weather a required protection effectiveness of a high-speed object by means of a spatial-distributed system that includes many parachuted jamming sub-systems one has to use 1,91 times more jamming sub-systems than the number sufficient to solve the problem when there is no precipitation.

When a numerical experiment was conducted it was assumed that all raindrops are of the same dimension and spherical shape. But real rain contains raindrops of different dimensions. Moreover, their shape may be non-spherical. A more accurate evaluation of a penetration coefficient for a signal radiated by a jamming sub-system when air/rain interface contains raindrops of different dimensions and shapes is left for further investigation.

Ershov G.V. Evaluation of parachuted jamming systems number for high-speed objects protection when reflection from air/rain interface takes place. Radiotekhnika. 2021. V. 85. № 5. P. 55−63. DOI: https://doi.org/10.18127/j00338486-202105-06 (In Russian)

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