Abstract
Missile seekers are becoming increasingly more capable of using Doppler Beam Sharpening (DBS) modes as part of the homing cycle, which requires new countermeasures against this mode. One type of countermeasure, is to create false targets within the seeker DBS image. This paper proposes a jamming technique to generate false targets at a precise location within a seeker DBS image, by both delaying and adding a Doppler shift to received waveforms. The effects of tracking errors on the position of the false target are analysed, both analytically and with simulations and used to assess the practical implementation of the jamming scheme. An experimental DBS system was built to test the effectiveness of the jamming scheme against a platform moving in steps and assess errors caused by incorrectly estimating the seeker trajectory.
Highlights
Doppler Beam Sharpening (DBS) is a technique that uses the changing Doppler frequency caused by relative motion between a platform and a target, to synthetically narrow the main beam of the antenna and generate an image
Missile seekers benefit from using DBS, as it provides a crude imaging capability by improving azimuth resolution without being computationally expensive, like Synthetic Aperture Radars (SAR)
DBS can be performed with a dwell time in the order of tens of milliseconds, whereas SAR is in the order of whole seconds [6]
Summary
Doppler Beam Sharpening (DBS) is a technique that uses the changing Doppler frequency caused by relative motion between a platform and a target, to synthetically narrow the main beam of the antenna and generate an image. There is very little literature on jamming DBS modes, but previous work in [31] introduced the concept of creating false targets in DBS images of a missile seeker using a varying time delay method. For this method, the jammer receives the incoming waveform and delays it before re-transmitting. The research in this paper proposes a jamming technique to generate false targets at a precise location within a seeker DBS image, by both delaying and adding a Doppler shift to received waveforms. An experimental DBS system was built to test the effectiveness of the jamming scheme against a platform moving in steps and assess errors caused by incorrectly estimating the seeker trajectory
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