Hydroacoustic Calculation System

Sonar calculations system is a software product designed for ray-path and wave methods based calculation of a sound energy loss in marine environment for infrasonic and sonic frequency ranges.

 The developed methodology allows calculating spatial distribution of a sound energy loss (per spreading or attenuation) accounting for a user specified environmental model, characteristics of emitting and receiving systems.

Application Range 

Software product is designed to perform the current tactical calculations and to serve as a modeling tool for experimental and research objectives.

Capabilities

  • Well developed interactive user-friendly environment;
  • Usage of underwater topography database of the US National Center of Geophysical Data with two angular minutes resolution (ETOPO2) and five angular minutes resolution (ETOPO5);
  • Usage of climatologic database of sonic speed field of Word Ocean of USA Ministry of Defense (GDEM);
  • Calculations using wave and/or ray algorithms.

 

Acoustic Field Calculation

 

Purpose:  Calculation of the hydroacoustic field (losses along the acoustic energy propagation path) at the specified coordinates and parameters of the source.

 

Capabilities

* Possibility to choose for the calculations any area of the World Ocean.

* Consideration of various factors affecting the formation of hydroacoustic field:

- Topography and structure of the bottom (on the propagation path);

- Rough surface;

- Depending on the sound velocity profile of (in water and ground) in the propagation path of acoustic energy.

* The wave and ray methods of acoustic field calculation are used to ensure the calculations’ accuracy and efficiency.

* Displaying calculation results in a user friendly form as a spatial pattern with different color palette, corresponding with gradation of acoustic field parameters (level of losses for the propagation path). Ability to withdraw the horizontal and vertical sections of propagation loss.

 

Application Range 

Research related to study of acoustic energy propagation in the ocean.

 

Program Description

During the startup in the main window, you can create a new project or change a previously saved project 

The new project asked to enter initial data, choose for calculations an arbitrary area of the World Ocean

In the selected area set the coordinates of start and end points of the route calculation

Using databases for input to the program initial data characterizing the track bottom topography calculation.

Selection of appropriate databases and display the sound velocity profile on the propagation path (in the water)

Selection of appropriate databases and display the sound velocity profile on the propagation path (in a ground)

Input of initial data characterizing parameters of the sound source. Next graph shows the directional characteristics of the emitting antenna.

Input of initial data characterizing parameters of the receiver. Next graph displays the characteristics of the receiving antenna.

Setting the calculation terms. Displays the location of the source and the receiver.

Choosing the acoustic field calculating method (wave or ray method). Starting the process of calculation.

The calculation results: the acoustic energy losses in the propagation of sonar waves on a given route depending on the distance and depth.

The calculation results: Horizontal sectional drawing, describing the losses of acoustic energy on a given route for the selected depth.

The calculation results: Vertical sectional drawing, which characterizes the loss of acoustic energy as a function of depth for a given distance.

 

Evaluation Passive Sonar Capabilities

 

Purpose:  Evaluation of an expected range and construction of passive sonar detection zones at preset parameters of the source and signal receiver. 

Capabilities:

•Ability to choose for the calculations any area of the World Ocean.

•Ability to carry out calculations for various types of emitting and receiving antennas.

•Consideration of various factors affecting the formation of hydroacoustic field:

- Topography and structure of the bottom (on the propagation path);

- Rough surface;

- Depending on the sound velocity profile of (in water and ground) in the propagation path of acoustic energy.

•Consideration of sea noise characteristics depending on the area of observation.

•The wave and ray methods of acoustic field calculation are used to ensure the calculations’ accuracy and efficiency 

•Displaying calculation results in a user friendly form as a spatial pattern with different color palette, corresponding with gradation of acoustic field parameters (level of losses for the propagation path). Ability to withdraw the horizontal and vertical sections of propagation loss.

Application  Range :

•Research related to the evaluation of the effectiveness sonar equipment operating in listening mode

•Practical activities connected with design, development and use the sonar equipment, operating in listening mode

Program Description

 

During the startup in the main window, you can create a new project or change a previously saved project

The new project asked to enter initial data, choose for calculations an arbitrary area of the World Ocean

In the selected area set the coordinates of start and end points of the route calculation

The next step - display bottom topography along the route calculation (selected from the corresponding database)

Selection of appropriate databases and display the sound velocity profile on the propagation path (in the water)

Selection of appropriate databases and display the sound velocity profile on the propagation path (in a ground)

Input of initial data characterizing the monitoring tool, the object of observation and noise conditions 

Are enabled to view spectral characteristics of vehicle noise, and dynamic, seismic and thermal noise 

And also spectral characteristics of the environment noise, vehicle noise, and aggregate noise interference relative to the sonar’s frequency band 

Setting the calculation conditions for acoustic field calculation method (wave or ray method). Starting the calculation process.

The calculation results are presented:

A) as a function of the detecting  probability of an object from a distance and depth for a given propagation path of the acoustic energy

With the ability to display:

- Horizontal sectional drawing (for a fixed depth) 

- and vertical sectional drawing (for a fixed distance)

 

 

B) in the form of the detecting  probability of an object on the direction and distance (polar coordinates)

 C) in the form of the detecting  probability of an object on the direction and distance (Cartesian coordinates)

 

Active Sonar's Capabilities Evaluation

Active Sonar’s Capabilities Assessment

Purpose:  Evaluation of an expected range and construction of active sonar detection zones with determined parameters of the probing signal source and the object of echolocation.

Capabilities:

•Ability to choose for the calculations any area of the World Ocean.

•Ability to carry out calculations for various types of emitting and receiving antennas.

•Consideration of various factors affecting the formation of hydroacoustic field:

- Topography and structure of the bottom (on the propagation path);

- Rough surface;

- Depending on the sound velocity profile of (in water and ground) in the propagation path of acoustic energy.

•Consideration of sea noise characteristics depending on the area of observation.

•The wave and ray methods of acoustic field calculation are used to ensure the calculations’ accuracy and efficiency 

•Displaying calculation results in a user friendly form as a spatial pattern with different color palette, corresponding with gradation of acoustic field parameters (level of losses for the propagation path). Ability to withdraw the horizontal and vertical sections of propagation loss.

Application  Range :

•Research related to the evaluation of the effectiveness sonar equipment for various purposes.

•Practical activities connected with design, development and use the sonar equipment for various purposes.

•Research related to study of acoustic energy propagation in the ocean.

Program Description

 During the startup in the main window, you can create a new project or change a previously saved project

 

The new project asked to enter initial data, choose for calculations an arbitrary area of the World Ocean

 

In the selected area set the coordinates of start and end points of the route calculation

The next step - display bottom topography along the route calculation (selected from the corresponding database)

Selection of appropriate databases and display the sound velocity profile on the propagation path (in the water)

Selection of appropriate databases and display the sound velocity profile on the propagation path (in a ground)

On the next tab, enter initial data for calculations:

The technical characteristics of the emitting and receiving antennas.

 

On the next tab, enter initial data for calculations: 

Technical characteristics of the sonar emitting and receiving paths, hydro acoustic characteristics of an object, interference conditions, the probability of false alarm.

Are enabled to view spectral characteristics of the noise environment, and vehicle noise, and aggregate noise interference relative to the sonar’s  work frequency.

Setting the calculation conditions for acoustic field calculation method (wave or ray method). Starting the calculation process.

The calculation results are presented:

A) as a function of the detecting  probability of an object from a distance and depth for a given propagation path of the acoustic energy

With the ability to display:

- Horizontal sectional drawing (for a fixed depth)

- and vertical sectional drawing (for a fixed distance)

B) in the form of the detecting  probability of an object on the direction and distance (polar coordinates)

 

C) in the form of the detecting  probability of an object on the direction and distance (Cartesian coordinates)

 

3D visualization of sonar equipment capabilities

3D visualization of sonar equipment capabilities

Purpose: 3D Visualization of space area characterizing the spatial distribution of the fixed values of probability for the object detection.

Capabilities:

•Ability to choose for visualization any area of the World Ocean.

•Ability to display the sonar carrier with its gridded.

• Three-dimensional visualization of the bottom, the coastline and land.

•Ability to change the view on the shape that characterizes the spatial distribution of the fixed values of probability for the object detection.

•Ability to display horizontal and vertical sectional views, describing the capabilities of active sonar equipment in a given direction or at a given depth.

 

Application  Range :

•Research related to the evaluation of the effectiveness sonar equipment for various purposes.

•Practical activities connected with design, development and use the sonar equipment for various purposes.

•Research related to study of acoustic energy propagation in the ocean.

 

Program Description

 

 After starting the module file is loaded with the data calculated earlier,

using programs to assess the possibilities of active and passive sonar

Is assigned the probability of detection and the color of the shape that characterizes

the distribution of the given value of probability of detection, in the space

Based on the calculation results, the program produces a three-dimensional spatial figures

characterizing the sonar capabilities  

The is ability to display horizontal sectional drawing for three-dimensional figures

 

The is ability to display vertical sectional drawing for three-dimensional figures

 

Using the Mouse may change angle of view