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Track-While-Scan (TWS) Naval Weapons Systems. Learning Objectives Comprehend concepts of TWS system Comprehend concepts of TWS system Know the six basic.

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Presentation on theme: "Track-While-Scan (TWS) Naval Weapons Systems. Learning Objectives Comprehend concepts of TWS system Comprehend concepts of TWS system Know the six basic."— Presentation transcript:

1 Track-While-Scan (TWS) Naval Weapons Systems

2 Learning Objectives Comprehend concepts of TWS system Comprehend concepts of TWS system Know the six basic functions of a TWS system Know the six basic functions of a TWS system Comprehend the concepts of acquisition, tracking, and turning gates Comprehend the concepts of acquisition, tracking, and turning gates

3 Limitation of Traditional Search Radar: NO FIRE CONTROL SOLUTION

4 Problems Dedicated FC radar can only track one target. Dedicated FC radar can only track one target. Systems usually have separate Scanning and Tracking Radars. Systems usually have separate Scanning and Tracking Radars. The target knows its being tracked. The target knows its being tracked. The target can initiate Counter Measures The target can initiate Counter Measures Weapons home in on FC radar Weapons home in on FC radar

5 Concept of TWS Maintain Target tracks in a computer Maintain Target tracks in a computer Periodic updates from a scanning radar Periodic updates from a scanning radar

6 Functions of TWS Detection Detection Correlation Correlation Track Initiation and file generation (if a new target) Track Initiation and file generation (if a new target) Tracking Gates Tracking Gates Gate prediction, smoothing and positioning Gate prediction, smoothing and positioning Predict future target position Predict future target position

7 Gate Generation Acquisition gate Acquisition gate Tracking gate Tracking gate Turning gate Turning gate

8 Acquisition Gate 10 degrees 2000 yards

9 Tracking Gate 1.5 degrees 120 yards

10 Turn Detection Gate *Computer determines size of gate tracking gate

11 TWS Processing Acquisition Gate Tracking Gates Turn Detection Gate Tracking Gates Original Course

12 Track Initiation and Track File Generation Track file Track file Store position and gate dataStore position and gate data Code for acquisition window Code for acquisition window Calculations on the return of a target are done by a computer. Calculations on the return of a target are done by a computer. Much too slow to maintain a small tracking gate.Much too slow to maintain a small tracking gate.

13 Positioning and Smoothing Functions Repositioning and smoothing must be done within the TWS algorithm. Repositioning and smoothing must be done within the TWS algorithm. Lagging Target Lagging Target Leading Target Leading Target This is done mathematically.This is done mathematically.

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

15 TWS Radar System Advantages Scan and Track on same system Scan and Track on same system Tracking information used for computation of a fire control solution. Tracking information used for computation of a fire control solution. Immediate Fire Control Solution Immediate Fire Control Solution

16 Real World Applications AN/SYS-2 IADTAN/SYS-2 IADT used on some missile ships used on some missile ships Mk 92 CAS - FFGMk 92 CAS - FFG AN/SPQ-9 – 5 GunAN/SPQ-9 – 5 Gun Mk 23 TAS – NATO Sea SparrowMk 23 TAS – NATO Sea Sparrow AEGIS C&DAEGIS C&D holds track files for AEGIS holds track files for AEGIS dedicated computer dedicated computer

17 FFG 60 – USS Rodney M Davis

18 DD 982 – USS Nickelson

19 DDG 81 – USS W. S. Churchill

20 Summary Radar continues scanning Radar continues scanning Computer predicts positions Computer predicts positions Track while Scan! Track while Scan! Track information used for fire control solution. Track information used for fire control solution.

21 Questions?


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