underwaterChannel

Propagated and reflected sonar signals

Syntax

sonarsigout = underwaterChannel(sonarsigin,platforms)

Description

sonarsigout = underwaterChannel(sonarsigin,platforms) returns sonar signals, sonarsigout, as combinations of signals, sonarsigin, reflected from platforms, platforms.

Examples

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Reflect Sonar Emission From Platform

Open Live Script

Create a sonar emission and a platform and reflect the emission from the platform.

Create a sonar emission object.

sonarSig = sonarEmission('PlatformID',1,'EmitterIndex',1,'OriginPosition',[0 0 0]);

Create a platform structure.

platfm = struct('PlatformID',2,'Position',[10 0 0],'Signatures',tsSignature());

Reflect the emission from the platform.

sigs = underwaterChannel(sonarSig,platfm)

sigs = 
  2x1 sonarEmission array with properties:

    SourceLevel
    TargetStrength
    PlatformID
    EmitterIndex
    OriginPosition
    OriginVelocity
    Orientation
    FieldOfView
    CenterFrequency
    Bandwidth
    WaveformType
    ProcessingGain
    PropagationRange
    PropagationRangeRate

Reflect Sonar Emission from Platform within Tracking Scenario

Open Live Script

Reflect a sonar emission from a platform defined within a trackingScenario.

Create a tracking scenario object.

scenario = trackingScenario;

Create an sonarEmitter.

emitter = sonarEmitter(1);

Mount the emitter on a platform within the scenario.

plat = platform(scenario,'Emitters',emitter);

Add another platform to reflect the emitted signal.

tgt = platform(scenario);
tgt.Trajectory.Position = [30 0 0];

Emit the signal using the emit object function of a platform .

txSigs = emit(plat, scenario.SimulationTime)

txSigs = 1x1 cell array
    {1x1 sonarEmission}

Reflect the signal from the platforms in the scenario.

sigs = underwaterChannel(txSigs, scenario.Platforms)

sigs = 1x1 cell array
    {1x1 sonarEmission}

Input Arguments

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`sonarsigin` — Input sonar signals
array of `sonarEmission` objects

Input sonar signals, specified as an array of sonarEmission objects.

`platforms` — Reflector platform
cell array of `Platform` objects | array of `Platform` structures

Reflector platforms, specified as a cell array of Platform objects, Platform, or an array of Platform structures:

Field	Description
`PlatformID`	Unique identifier for the platform, specified as a scalar positive integer. This is a required field which has no default value.
`ClassID`	User-defined integer used to classify the type of target, specified as a nonnegative integer. Zero is reserved for unclassified platform types and is the default value.
`Position`	Position of target in scenario coordinates, specified as a real-valued 1-by-3 vector. This is a required field. There is no default value. Units are in meters.
`Velocity`	Velocity of platform in scenario coordinates, specified as a real-valued 1-by-3 vector. Units are in meters per second. The default is `[0 0 0]`.
`Speed`	Speed of the platform in the scenario frame specified as a real scalar. When speed is specified, the platform velocity is aligned with its orientation. Specify either the platform speed or velocity, but not both. Units are in meters per second The default is `0`.
`Acceleration`	Acceleration of the platform in scenario coordinates specified as a 1-by-3 row vector in meters per second-squared. The default is `[0 0 0]`.
`Orientation`	Orientation of the platform with respect to the local scenario NED coordinate frame, specified as a scalar quaternion or a 3-by-3 rotation matrix. Orientation defines the frame rotation from the local NED coordinate system to the current platform body coordinate system. Units are dimensionless. The default is `quaternion(1,0,0,0)`.
`AngularVelocity`	Angular velocity of platform in scenario coordinates, specified as a real-valued 1-by-3 vector. The magnitude of the vector defines the angular speed. The direction defines the axis of clockwise rotation. Units are in degrees per second. The default is `[0 0 0]`.
`Signatures`	Cell array of signatures defining the visibility of the platform to emitters and sensors in the scenario. The default is the cell array {`rcsSignature`,`irSignature` , `tsSignature`}

If you specify an array of platform structures, set a unique PlatformID for each platform and set the Position field for each platform. Any other fields not specified are assigned default values.