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TRACK-WHILE-SCAN

TRACK-WHILE-SCAN. LIMITATIONS OF TRADITIONAL SEARCH RADARS. NO FIRE CONTROL SOLUTION!!!. LIMITATIONS OF TRADITIONAL FC RADARS. Can only track one target Separate scanning and tracking radars Target knows it’s being tracked Target can initiate counter measures

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TRACK-WHILE-SCAN

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  1. TRACK-WHILE-SCAN

  2. LIMITATIONS OF TRADITIONAL SEARCH RADARS NO FIRE CONTROL SOLUTION!!!

  3. LIMITATIONS OF TRADITIONAL FC RADARS • Can only track one target • Separate scanning and tracking radars • Target knows it’s being tracked • Target can initiate counter measures • Weapons home in on FC radar

  4. TWS CONCEPT • Radar scans continually • Computer maintains target tracks • Receives periodic radar scan updates • Builds track history • Predicts positions • Track info used for fire control solution • Track-While-Scan!!

  5. FUNCTIONS OF TWS • Track initiation and file generation • Acquisition • Detection • Correlation • Tracking “GATES” • Gate prediction/smoothing/positioning • Prediction of future target position

  6. KEY TO TWS IS: GATE GENERATION • Acquisition gate • Tracking gate • Turning detection gate

  7. ACQUISITION GATE 10 degrees 10 degrees 2000 yards

  8. TRACKING GATE 1.5 degrees 1.5 degrees 120 yards

  9. tracking gate TURN DETECTION GATE Computer determines gate size

  10. TWS PROCESSING Original Course Turn Detection Gate New Course Tracking Gates Acquisition Gate

  11. GATE POSITIONING/PREDICTION/SMOOTHING FUNCTIONS • Math done by TWS computer algorithm • “Lagging” Target • “Leading” Target

  12. Do parameters match those from previous scan Does track ambiguity exist Resolve ambiguity Yes Scanning radar detects a target Yes NO NO Generate a new track file & store data Generate an acquisition gate Generate Track Gate & indicator in file Compute target tracking parameters Acquisition Target previously in track or acquisition Ready for the next radar scan information Reposition track gate centered on future position Update tracking parameters Recompute track gate Track TWS Algorithm Diagram

  13. ADVANTAGES OF TWS RADAR • Scan and track f(x) on same system • Phased array positions beams instantly • Immediate establishment of a track • Random search while maintaining track • Tracking info used for fire control solution • Immediate fire control solution

  14. REAL WORLD APPLICATIONS • AN/SYS-2 IADT – Some missile ships • MK 92 CAS - FFG • AN/SPQ-9 – 5” Gun • MK 25 TAS – NATO Sea Sparrow • SPY-1 - AEGIS C&D

  15. USS RODNEY DAVIS (FFG-60)

  16. USS NICKELSON (DD 982)

  17. USS WINSTON CHURCHILL (DDG 81)

  18. SUMMARY • Radar scans continually • Computer maintains target tracks • Receives periodic radar scan updates • Builds track history • Predicts positions • Track info used for fire control solution • Track-While-Scan!!

  19. Questions?

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