MONOPULSE SIGHTING RADAR PROTECTION FROM
INTERFERENCE WITH JAMMING CLOUDS
 

Čedomir Gacović

Abstract:
During combat operations, when maximum electronic interference is present, in the artillery-rocket systems of the Air Defence, whose function is based on the radiolocation principle, sighting radars are rudimentary, indispensable elements of the sighting line, viz. elements in which tracking accuracy is the primary feature to attack electronically.
Sighting radar, whether part of the rocket or artillery air defence systems, is intended for continuous automatic tracking of the assigned target by angled coordinates, the distance, and in some versions also the speed. Interfering with the regular operation of the sighting radar is done by acting separately or simultaneously on the channel for automatic target tracking by angled coordinates, on the channel for automatic distance target tracking and the channel for automatic velocity target tracking.
In this paper, the protection of monopulse sighting radar from jamming cloud interference was analyzed. The impact of polarization characteristics of the interference cloud jamming points and the radar antenna to the angle error, as well as the effect of frequency of signal selection on the radar angle error was given particular attention. The probability density functions of conditional errors at random and in a stable relationship of polarization of signal jamming points were derived. The impact of changes in the working frequency of the radar from pulse to pulse and from packet to packet on the angle error at stochastically dependent and stochastically independent measurements of angular coordinates of the target in the jamming cloud was also analysed. Furthermore, an overview of monopulse
sighting radar protection from the most commonly used types of interference is
also presented.
Key words: radar, sighting radar, monopulse radar, radar jamming, electronic
jamming, interference protection, ECCM (electronic counter-countermeasures).