L18 Pre-flight

L18 Pre-flight#

Block 2: RF Electronic Warfare — Lesson 18: Active Deception Work this before L18. Pre-flights are never collected — in class, anyone may be cold-called to present any question at the board, and that recitation is the participation grade.

Assumed pre-class reading#

  • L17 wrap-up

  • The Jupyter Book Reading page for L18 — deception vs noise, DRFM, false-target injection, range-gate pull-off, and decoys.

Quiz questions (5 items, ~5 minutes)#

Q1. (Multiple choice) How does deceptive jamming differ from noise jamming?

  • [ ] (a) Deception radiates far more power than noise jamming, which is why it works

  • [ ] (b) Noise masks the real return; deception injects a believable false one

  • [ ] (c) Deception is its own division of EW, while only noise jamming counts as EA

  • [ ] (d) There is no real difference; both simply deny the radar a usable track

Q2. (Multiple choice) What makes a DRFM repeater more dangerous than a simple transponder?

  • [ ] (a) It transmits at far higher power than any transponder, so its copy is louder

  • [ ] (b) It replays a phase-coherent copy with programmable delay and Doppler

  • [ ] (c) It works without ever needing to know the threat radar’s frequency

  • [ ] (d) It generates false targets on its own, without receiving the radar’s pulse

Q3. (Multiple choice) Range-gate pull-off (RGPO) defeats a tracking radar by:

  • [ ] (a) Overloading the radar’s receiver front end until the tracker drops lock

  • [ ] (b) Capturing the range gate with a cover pulse, then walking it off the target

  • [ ] (c) Ramping the false return’s Doppler until the velocity gate slips off

  • [ ] (d) Filling every range cell with false targets until the gate cannot choose one

Q4. (Multiple choice) A towed or expendable decoy protects an aircraft mainly by:

  • [ ] (a) Physically absorbing the warhead so the missile detonates away from the aircraft

  • [ ] (b) Presenting a brighter, believable target that draws the lock off the aircraft

  • [ ] (c) Jamming the missile’s command-guidance link from behind the aircraft

  • [ ] (d) Reducing the aircraft’s RCS so the seeker cannot form a track

Q5. (Short answer) Name a counter to range-gate pull-off and explain why it works. Then give one general reason deception is “not free.”

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