Modelling and Simulation

Modelling and simulation of countermeasure performance is essential in exploring new payload concepts, planning of trials, user training and the illustration of fundamental countermeasure concepts.

Chemring Countermeasures has an experienced team of engineers carrying out countermeasure studies and developing a variety of modelling and simulation software tools.

CounterSim - is the principle engagement modelling software developed by Chemring. It simulates engagements of RF and IR homing missiles against ships, aircraft and land vehicles. Associated with CounterSim are 2 other applications produced by Chemring.

Object Viewer - used to view 3D models of platforms - ships, vehicles, aircraft and other objects such as scenery items. It is used to set thermal characteristics of 3D models and to view 3D files of platforms with trajectories of dispensed countermeasures and missile tracks using data generated by CounterSim. A 3D aircraft model in a false colour IR view is shown below.

Image Analyser - is used to analyse thermal imager data files to produce polar radiant intensity plots. The thermal imager files are either from actual cameras or from cameras simulated in CounterSim. CounterSim has a recording mode that produces a data file for use with the SIMDIS 3D visualisation software produced by the US Naval Research Laboratories (NRL). Users need to register with NRL to use SIMDIS. https://simdis.nrl.navy.mil/

Data files produced by CounterSim can readily be adapted for use with other 3D rendering software to produce sophisticated multimedia views of a missile and target engagement.

CounterSim is modular and therefore capable of being tailored to the end users' requirements. In its most basic form, CounterSim includes one or more generic platforms, chaff and IR decoys, missiles and missile seekers. These are referred to as Items. Our accumulated knowledge of countermeasure design and performance data ensures that a comprehensive set of IR and RF payloads can be modelled together with their dispensing systems and delivery vehicles.

Each Item has its own inputs or properties. Users can specify and name items such as aircraft and ships, decoy systems, missiles and seekers depending on data availability and security classification. CounterSim Items can be used as building blocks to construct and save larger more complex items e.g. a ship with its associated visual and IR 3D renditions, radar cross section and countermeasures system including specific launchers and barrels. Items can easily be added to or subtracted from an engagement scenario.

CounterSim is concerned with the homing phase of the missile's flight and the deployment of decoys by the target. The purpose of the simulations is to test the effectiveness of the decoys in seducing the missile, to aid in the visualisation of an engagement and to estimate the probability of survival of the target. The execution of the engagement runs asynchronously, essentially being controlled by the scan rate of the items. The engagement can be paused and single stepped at any stage to allow the progress of the engagement to be examined.

The example scenario shows an aircraft under attack from a surface to air IR guided missile.

Several windows are normally shown providing one or more 2D map views of the engagement. The status window and sensor views provide the user with feedback about the progress of a simulation. In the example, there are 2 different scale plan views and a vertical section view to show the aircraft and missile positions. Key parameters are shown in the status window and these are continuously updated during the simulation. The signal processor view shows the changing signal levels in the seeker tracking processor. The seeker view of the aircraft is a false colour view of the aircraft seen in the 3-5 ìm IR band. CounterSim creates summary and log files that record pre-selected parameters such as the x, y and z coordinates of the major Items, RCS values and the missile miss distance during an engagement.

By running single engagements, the general principles of countermeasures and missile decoy can be demonstrated and the set up of more detailed analysis can be explored.

CounterSim features a batch Wizard to easily set up a batch file. This includes all of the basic parameters of an engagement and a list of those parameters that are to be varied in successive runs e.g. wind direction, ship speed, ship manoeuvre. CounterSim can then be operated in batch mode to automatically run the series of engagements. A data file produced by the batch mode run can then be imported into other application software such as Microsoft Excel® or a purpose written application for further analysis.

Variants of the CounterSim are tailored to different requirements from basic training to a full analytical model capable of automatically running a large series of engagements for later analysis. CounterSim can also be limited to Air, Naval or Land and can also be limited to cover only RF or IR seekers and countermeasures

CounterSim system requirements;

- A PC with a Pentium II or higher processor, 128Mb of RAM, and a graphics display with a resolution of 1024 x 768 pixels and with 65536 colours or higher.
Windows® XP or 2000 operating systems.
- A 3D graphics card that can accelerate OpenGL applications is required in order to run the visualisation effectively.
- A spreadsheet application if the user wishes to perform additional analysis of the data.
- Microsoft Excel® version 97 or later, to run the batch wizard and other associated Excel based tools.

If you would like to find out more about our modelling and simulation capability then please send a fax or e mail enquiry to:
Technology Department, Chemring Countermeasures, High Post, Salisbury. SP4 6AS. UK
Telephone: +44 (0) 1722 428738
Facsimile: +44 (0) 1722 428794
E-Mail: modelling@chemringcm.com

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