Digital false-target image synthesiser for countering ISAR

Digital Image Synthesizers: Are Enemy Sensors Really Seeing What's There?

“…That is, each modulator synthesizes the part of the overall false target image that lies within the range bin associated with that modulator. Each complex output pulse I(m,n) is the superposition of N r copies of the intercepted pulse, each delayed with respect to one another by the delay within the modulator, scaled differently by the gains 2 s{r ' n) (binary shift) and phase rotated by <f > inc (r,n) as [4] coefficients applied to the ASIC. Also note that this capability can not be achieved using only digital RF memory technology since the number of complex modulations is extensive.…”

Jamming method based on dynamical convolution against ISAR

“…A kind of phase modulated jamming technology [6] based on Msequence is researched. A similar clutter jamming (SCJ) method and an digital false-target image synthesiser for countering ISAR are researched [7]- [8].These are of theoretical significance, but have little practical value. In this paper, we will present a new jamming method based-on dynamical convolution, which makes the changing template of the target rapidly during the trajectory full.…”

Rotational Micro-Motion Modulated Jamming for Countering Isar Based on Intermittent Sampling Repeater

“…Surveillance systems such as US ALCOR radar [5], the AN/APS-137B(V) radar [6] and the ground based radar (GBR) [7] possess the capability of detecting, classifying and tracking by using the ISAR imaging mode. ISAR image, characterized by high resolution along both the range and cross-range directions, can also be used to launch weapon systems [6]. The need for countering wideband ISAR imaging radars remains a high priority in electronic warfare [8,9].…”

“…Actually, the jamming method based on the rotating angular reflector is a passive jamming technique and the reflector array may be difficult to set up especially in some aerospace targets, such as aircraft and ballistic targets on which space is limited. The digital radio frequency memory (DRFM) is widely used in radar active coherent jamming [6,[23][24][25][26]. With the capability of high speed sampling, DRFM reduces production costs and achieves a wide bandwidth.…”