L19 Pre-flight

L19 Pre-flight#

Block 2: RF Electronic Warfare — Lesson 19: Project 2 Work Day Work this before L19. 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#

  • The Project 2 handout (B-21 Standoff Emitter Geolocation), posted with IADS_Scenario.csv, rwr_collection_sim.p (a p-coded function — call it like any function; its source stays hidden), and L19_Project2Starter.m.

  • L13 and L14 wrap-ups.

This quiz checks that you arrive ready to work, not that you have done the project. Read the handout and skim the starter before class.

Quiz questions (5 items, ~5 minutes)#

Q1. (Multiple choice) In Project 2, the basic measurement the RWR provides for geolocation is:

  • [ ] (a) The range to the emitter, from the round-trip time of its pulses

  • [ ] (b) The bearing (angle of arrival) to the emitter

  • [ ] (c) The emitter’s transmit power, which gives range by the one-way \(1/R^2\) law

  • [ ] (d) The emitter’s position, decoded from its pulse descriptor words

Q2. (Multiple choice) To produce a position fix for an emitter, your collection must include:

  • [ ] (a) A single bearing taken from one point on the flight path

  • [ ] (b) Two or more bearings taken from separated points along the path

  • [ ] (c) One very long dwell at a single waypoint to average the noise

  • [ ] (d) The emitter’s cooperation — it must transmit a known reference signal

Q3. (Mark all that apply) Judged by CEP, which changes make an emitter’s location-error ellipse smaller?

  • [ ] (a) Opening the crossing (cut) angle toward \(90^\circ\)

  • [ ] (b) Lengthening the collection baseline at the same standoff range

  • [ ] (c) Flying closer to the emitter (shorter range)

  • [ ] (d) Dropping from many bearing cuts to just two on the same leg

  • [ ] (e) Fitting a noisier RWR (larger \(\sigma_\theta\)) at the same geometry

Q4. (Short answer) Project 2 has a built-in tension between accuracy and survivability. In one sentence, explain it.

Q5. (Multiple choice) The IADS_Scenario.csv gives each emitter’s position as a coarse ELINT prior (±5 km). The true positions are:

  • [ ] (a) Exactly the CSV values, so you can score your fixes against them

  • [ ] (b) Hidden inside rwr_collection_sim.p, to be estimated from the bearings

  • [ ] (c) Provided in a separate answer key released after the presentations

  • [ ] (d) Irrelevant — the CEP spec is judged against the CSV priors, not the truth

Contents