Track while scan tws
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Track-While-Scan (TWS). Naval Weapons Systems. Learning Objectives. Comprehend concepts of TWS system Know the six basic functions of a TWS system Comprehend the concepts of acquisition, tracking, and turning gates. Limitation of Traditional Search Radar:. NO FIRE CONTROL SOLUTION.

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Track-While-Scan (TWS)

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Track while scan tws

Track-While-Scan(TWS)

Naval Weapons Systems


Learning objectives

Learning Objectives

  • Comprehend concepts of TWS system

  • Know the six basic functions of a TWS system

  • Comprehend the concepts of acquisition, tracking, and turning gates


Limitation of traditional search radar

Limitation of Traditional Search Radar:

NO FIRE CONTROL SOLUTION


Problems

Problems

  • Dedicated FC radar can only track one target.

  • Systems usually have separate Scanning and Tracking Radars.

  • The target knows it’s being tracked.

  • The target can initiate Counter Measures

  • Weapons home in on FC radar


Concept of tws

Concept of TWS

  • Maintain Target tracks in a computer

  • Periodic updates from a scanning radar


Functions of tws

Functions of TWS

  • Detection

  • Correlation

  • Track Initiation and file generation (if a new target)

  • Tracking “Gates”

  • Gate prediction, smoothing and positioning

  • Predict future target position


Gate generation

Gate Generation

  • Acquisition gate

  • Tracking gate

  • Turning gate


Acquisition gate

Acquisition Gate

10 degrees

10 degrees

2000 yards


Tracking gate

Tracking Gate

1.5 degrees

1.5 degrees

120 yards


Turn detection gate

tracking gate

Turn Detection Gate

*Computer determines size of gate


Tws processing

TWS Processing

Original Course

Turn Detection Gate

Tracking Gates

Tracking Gates

Acquisition

Gate


Track initiation and track file generation

Track Initiation and Track File Generation

  • Track file

    • Store position and gate data

  • Code for acquisition window

  • Calculations on the return of a target are done by a computer.

    • Much too slow to maintain a small tracking gate.


Positioning and smoothing functions

Positioning and Smoothing Functions

  • Repositioning and smoothing must be done within the TWS algorithm.

  • “Lagging” Target

  • “Leading” Target

    • This is done mathematically.


Tws diagram

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 Diagram


Tws radar system advantages

TWS Radar System Advantages

  • Scan and Track on same system

  • Tracking information used for computation of a fire control solution.

  • Immediate Fire Control Solution


Real world applications

Real World Applications

  • AN/SYS-2 IADT

    • used on some missile ships

  • Mk 92 CAS - FFG

  • AN/SPQ-9 – 5” Gun

  • Mk 23 TAS – NATO Sea Sparrow

  • AEGIS C&D

    • holds track files for AEGIS

    • dedicated computer


Summary

Summary

  • Radar continues scanning

  • Computer predicts positions

  • Track while Scan!

  • Track information used for fire control solution.


Track while scan tws

Questions?


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