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SEARCH PLAN VARIABLES

SEARCH PLAN VARIABLES. Instructor Notes. Objectives. Demonstrate the relationship between Track Spacing (S); Corrected Sweep Width (W); Coverage Factor (C) State the factors needed to obtain a corrected visual sweep width Locate the visual sweep width estimate for night detection aids

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SEARCH PLAN VARIABLES

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  1. SEARCHPLAN VARIABLES

  2. Instructor Notes

  3. Objectives • Demonstrate the relationship between Track Spacing (S); Corrected Sweep Width (W); Coverage Factor (C) • State the factors needed to obtain a corrected visual sweep width • Locate the visual sweep width estimate for night detection aids • Compute Coverage Factor (C)

  4. The Goal of Search Planning “To cover as much of the search area as possible with a reasonable probability of detection with the ultimate aim to maximize the probability of success.”

  5. Search Plan Variables TRACK SPACING (S) SWEEP WIDTH (W) COVERAGE FACTOR (C)

  6. s s s s Track Spacing (S) The distance between two adjacent parallel search legs Simultaneous Sweeps Successive Sweeps

  7. Search objects missed within Sweep Width POD SWEEP WIDTH LATERAL RANGE IN SWEEP WIDTHS Search objects detected outside Sweep Width NOTE: Number of search objects missed in area “A” is equal to number of search objects sighted in area “B” Figure H-22 Sweep Width Sweep Width (W)

  8. Sweep Width (W) • A measure of detection capability • Based on scientific study • Some must be corrected for weather, fatigue, velocity

  9. Visual Sweep Widths W = Wu x fw x ff x fv Sweep width corrected (W) = • sweep widthuncorrected (Wu) x • weather correction (fw) x • fatigue correction (ff) x • speed correction (fv-aircraft only)

  10. Visual Sweep Widths W = Wu x fw x ff x fv Example Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 knots Seas 4 ft Crew fatigue Yes SRU Speed 120 kts

  11. Visual Sweep Widths Search Altitude

  12. Visual Sweep Widths W = Wu x fw x ff x fv Uncorrected Visual Sweep Width Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 kts Seas 4 ft Crew fatigue Yes SRU Speed 120 kts

  13. Visual Sweep Widths Uncorrected Visual Sweep Widths

  14. Uncorrected Visual Sweep Widths Visual Sweep Widths

  15. Visual Sweep Widths W = Wu x fw x ff x fv Uncorrected Visual Sweep Width Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 kts Seas 4 ft Crew fatigue Yes SRU Speed 120 kts Wu = 6.3

  16. W = Wu x fw x ff x fvWeather Correction Factor Visual Sweep Widths Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 kts Seas 4 ft Crew fatigue Yes SRU Speed 120 kts

  17. Visual Sweep Widths W = Wu x fw x ff x fv Weather Correction Factor

  18. Visual Sweep Widths W = Wu x fw x ff x fvWeather Correction Factor Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 kts Seas 4 ftCrew fatigue Yes SRU Speed 120 kts Fw = 0.9

  19. Visual Sweep Widths W = Wu x fw x ff x fvFatigue Correction Factor Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 kts Seas 4 ftCrew fatigue Yes SRU Speed 120 kts

  20. Visual Sweep Widths W = Wu x fw x ff x fvFatigue Correction Factor Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 kts Seas 4 ftCrew fatigue Yes SRU Speed 120 kts Ff = 0.9

  21. Visual Sweep Widths W = Wu x fw x ff x fvSpeed Correction Factor Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 kts Seas 4 ftCrew fatigue Yes SRU Speed 120 kts

  22. Visual Sweep Widths W = Wu x fw x ff x fvSpeed Correction Factor

  23. Visual Sweep Widths W = Wu x fw x ff x fvSpeed Correction Factor Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 kts Seas 4 ftCrew fatigue Yes SRU Speed 120 kts Fv = 0.9

  24. Visual Sweep Widths W = Wu x fw x ff x fv Example Search Object 33 ft Power Boat SRU Type HH-65 Altitude 1000 ft Visibility 10 nm Wind 14 kts Seas 4 ftCrew fatigue Yes SRU Speed 120 kts Wu = 6.3 fw = 0.9 ff = 0.9 fv = 0.9 W = 4.59

  25. Visual Sweep Widths Uncorrected Visual Sweep Width Wu = 6.3 fw = 0.9 ff = 0.9 fv = 0.9 W = 4.59 SRU track

  26. Visual Sweep Widths Uncorrected Visual Sweep Width Wu = 6.3 fw = 0.9 ff = 0.9 fv = 0.9 W = 4.59 SRU track

  27. Orange smoke Red flare Star shell Dye markers Tracers Signal mirrors Visual Distress Signaling Devices (VDSD)

  28. EPIRB/ELT* Surface Radar FLAR SLAR FLIR NVG* Electronic Search Sensors

  29. Coverage Factor (C) • Measure of search thoroughness or how well an area was searched. • Entering argument when calculating Probability of Detection. C = W/S

  30. How to use the Bookmark W / / C S X

  31. Sweep Width Track Spacing SRU track C = 1.0 S = W (1: 1 Ratio) Track Spacing and Sweep Width are equal.

  32. C = 0.5 W < S (1:2 Ratio) Sweep Width Track Spacing Sweep Width Track Spacing is greater than the Sweep Width.

  33. C = 1.5 W > S (3:2 Ratio) Sweep Width Track Spacing Sweep Width Track Spacing is less than the Sweep Width.

  34. Review • Distance between two adjacent search legs • Width of a swath centered on an SRU’s track where probability of detecting object outside that swath is equal to missing the object inside the swath • Measure of search thoroughness or how well an area was searched

  35. Review • What are the factors for correcting a Visual Sweep Width? • What is the correction factor for a VDSD? • Sweep Width divided by Track Spacing = ??

  36. And that is all there is to it! LAB TIME

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