Vojtech Jenik

Multimode Adaptable Microwave Radar Sensor Based on Leaky-Wave Antennas

New research and recent developments in active defense systems represent a promising way to protect military vehicles by detecting and subsequently eliminating threatening missiles with appropriate active counter-measures. Operating these defense systems requires a number of sensors, usually microwave, which must, above all, identify and track the target while generating signals to determine the correct counter-measure reaction. This paper shows that such multifunction and multimode sensors can be designed and implemented using leaky-wave antennas (LWAs). Connected radar circuits often employ a wideband modulation, so an analysis of the influence of the LWAs used on such a modulation is also included. A multimode adaptable pseudonoise radar equipped with LWAs was tested using bullets and live, armed cumulative missiles. The results confirm the functionality of the solutions presented.

Microwave Doppler radar sensor with enhanced immunity against interferences

Modern anti-armor missiles represent enormous threat for any military vehicle. Simple hand-held missiles are able to penetrate 300 mm, more sophisticated missiles up to 1000 mm of the best steel armors. Active defense methods seem to be promising ways how to face this problem. These systems are based on sensors able to detect and measure approaching threat missile and generate signals that activate a suitable counter-measure. The paper describes Doppler radar sensors designed for active defense configurations. The designed version solves one of potential problems connected with employment of these radars at military vehicles. This concerns sufficiently high immunity against both unintentional and intentional interfering signals.