Angle deception jamming
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Angle deception jamming is an electronic warfare technique used against conical scanning radar systems. It generates a false signal that fools the radar into believing the target is to one side of the boresight, causing the radar to "walk away" from the target and break its radar lock-on. It is also known as angle walk-off, angle stealing, or inverse con-scan.
Angle stealing was one of the earliest jamming techniques to be used operationally, with systems employed against the German Würzburg radars near the end of World War II. The technique is not useful against monopulse radars, and is one of the main reasons those radars became popular in the post-war era.
Angle stealing belongs to the wider class of "deceptive jamming" techniques, which attempt to deceive radars based on knowledge of their operating procedures, rather than simply trying to blind them with noise. Another popular deception technique that was used against early radars is range gate pull-off.