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Statements

Subject Item
dbr:Range_gate_pull-off
rdfs:label
Range gate pull-off
rdfs:comment
Range gate pull-off (RGPO) is an electronic warfare technique used to break radar lock-on. The basic concept is to produce a pulse of radio signal similar to the one that the target radar would produce when it reflects off the aircraft. This second pulse is then increasingly delayed in time so that the radar's range gate begins to follow the false pulse instead of the real reflection, pulling it off the target.
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dbc:Electronic_warfare
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1014247371
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dbr:The_Blitz dbr:Chaff_(countermeasure) dbr:AI_Mk._IV_radar dbr:Frequency_agility dbr:AI_Mk._VIII_radar dbr:Semi-active_radar_homing dbr:Amplitude_modulation dbr:Electronic_warfare dbr:Fighter_aircraft dbr:Transponder dbr:Pulse-Doppler_radar dbr:Doppler_effect dbr:Doppler_radar dbr:Air_Ministry dbr:GL_Mk._I_radar dbr:Bomber_Command dbr:Radar dbr:Range_gate dbr:Angle_deception_jamming dbr:Radar_lock-on dbr:Plan-position_indicator dbr:Moving_target_indication dbr:Pulse_repetition_frequency dbc:Electronic_warfare dbr:British_Army dbr:Fighter_Command
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dbo:abstract
Range gate pull-off (RGPO) is an electronic warfare technique used to break radar lock-on. The basic concept is to produce a pulse of radio signal similar to the one that the target radar would produce when it reflects off the aircraft. This second pulse is then increasingly delayed in time so that the radar's range gate begins to follow the false pulse instead of the real reflection, pulling it off the target. Doppler radars may not use range gates and instead select a single target by narrowly filtering frequencies on either side of the target's initial return. Against these radars, the related velocity gate pull-off (VGPO) can be used. These send a return signal that slowly changes in frequency, rather than time, hoping the radar's velocity gate will be pulled off the target in the same general fashion. Pull-off belongs to the wider family of "deceptive jamming" concepts that use details of the target radar to their advantage, rather than attempting to simply overpower the radar's signal. Alternate names for "pull-off" include "stealing" and "walk-off". A related technique is angle deception jamming.
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