Accession Number : ADD009662

Title :   Delay Control for a Pulse Repeat-Back Jamming System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : White,Charles F

Report Date : 04 May 1982

Pagination or Media Count : 7

Abstract : In a repeat-back jammer of the type used to deceive range tracking radar systems, wherein tracking is accomplished by a gate at the input of said radar system and a servo system which adjusts the relative time position of the input gate to coincide with echo pulses returning from a distant target, and wherein said jammer includes a repeat-back amplifier which transmits a jamming pulse for each said echo pulse the initial jamming pulse being so delayed with respect to said echo pulse that only a minor portion of said jamming pulse coincides with said input gate, said jamming pulse being of sufficient amplitude that said minor portion obscures the echo pulse, the improvement which comprises; time delay means to increase said initial dealy of said jamming pulse with respect to said echo pulse in response to a control signal, wave generating means to supply a control signal for said time delay means and a multiplier means for multiplying said signal by 1 - microns(o)beta(o) interconnecting said time delay means and said wave generating means, wherein microns(o)beta(o) is the open loop transfer function of said servo system. (Author)

Descriptors :   *Patents, *Radar jamming, *Radar pulses, Transfer functions, Delay, Servomechanisms, Input, Pulses, Position(Location), Control, Open loop systems, Jamming, Tracking, Radar, Gates(Circuits), Echoes, Time intervals, Signals

Subject Categories : Radar Countermeasures
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE