Radar Target

Radar target

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Libraries:
Phased Array System Toolbox / Environment and Target

Description

The Radar Target block models a radar target that reflects the signal according to the specified radar cross section (RCS). The block supports a non-fluctuating target model and all four Swerling target models. The block does not support polarized signals.

Ports

Input

X — Incident signal

complex-valued N-by-1 column vector | complex-valued N-by-M matrix

Incident signal, specified as a complex-valued N-by-1 column vector or complex-valued N-by-M matrix. The value M is the number of signals. Each signal corresponds to a different target. The value N is the number of samples in each signal.

The size of the first dimension of the input matrix can vary to simulate a changing signal length. A size change can occur, for example, in the case of a pulse waveform with variable pulse repetition frequency.

Data Types: double

RCS — Mean radar cross-section

nonnegative scalar | 1-by-M row vector of nonnegative values

Mean radar cross-section, specified as nonnegative scalar or 1-by-M row vector of nonnegative values. M is the number of targets. This parameter applies to fluctuating and non-fluctuating targets. If you specify M incident signals, you can specify the radar cross-section as a scalar or as a 1-by-M vector. For a scalar, the same value will be applied to all signals. Units are in m².

Dependencies

To enable this port, set the Source of mean radar cross section pull down menu to Input port.

Data Types: double

Update — Indicator to update radar cross-section

0 | 1

Indicator to update radar cross-section for fluctuating targets, specified as 0 or 1. When set to 0, the radar cross-section is constant. When set to 1, the radar cross-section fluctuates.

Dependencies

To enable this port, set the Fluctuation model pull down menu to anything except Nonfluctuating.

Data Types: double

Output

Out — Reflected signal

complex-valued N-by-1 column vector | complex-valued N-by-M matrix

Reflected signal, returned as a complex-valued N-by-1 column vector or complex-valued N-by-M matrix. The value M is the number of signals. Each signal corresponds to a different target. The value N is the number of samples in each signal.

Parameters

Source of mean radar cross section — Source of mean radar cross section

Property (default) | Input port

Specify whether the target’s mean radar cross-section (RCS) value comes from the Mean radar cross section parameter of this block or from an input port. Values of this parameter are

Property	The Mean radar cross section parameter for this block specifies the mean RCS value.
Input port	Choosing this value creates the RCS input port to specify the mean radar cross-section.

Mean radar cross section (m^2) — Mean radar cross section

1

Specify the mean value of the target's radar cross section, in square meters, as a nonnegative scalar. This parameter appears only when the Source of mean radar cross section parameter is set to Property.

Fluctuation model — Fluctuation model

Nonfluctuating (default) | Swerling1 | Swerling2 | Swerling3 | Swerling4

Specify the statistical model of the target as one of Nonfluctuating, Swerling1, Swerling2, Swerling3, or Swerling4. Setting this parameter to a value other than Nonfluctuating, allows setting cross-sections parameters via an input port, Update.

Propagation speed (m/s) — Signal propagation speed

physconst('LightSpeed') (default) | positive scalar

Signal propagation speed, specified as a real-valued positive scalar. The default value of the speed of light is the value returned by physconst('LightSpeed').

Data Types: double

Operating frequency (Hz) — Operating frequency

3e8 (default) | positive real scalar

Specify the carrier frequency of the signal that reflects from the target, as a positive scalar in hertz.

Simulate using — Block simulation method

Interpreted Execution (default) | Code Generation

Block simulation, specified as Interpreted Execution or Code Generation. If you want your block to use the MATLAB^® interpreter, choose Interpreted Execution. If you want your block to run as compiled code, choose Code Generation. Compiled code requires time to compile but usually runs faster.

Interpreted execution is useful when you are developing and tuning a model. The block runs the underlying System object™ in MATLAB. You can change and execute your model quickly. When you are satisfied with your results, you can then run the block using Code Generation. Long simulations run faster with generated code than in interpreted execution. You can run repeated executions without recompiling, but if you change any block parameters, then the block automatically recompiles before execution.

This table shows how the Simulate using parameter affects the overall simulation behavior.

When the Simulink^® model is in Accelerator mode, the block mode specified using Simulate using overrides the simulation mode.

Acceleration Modes

Block Simulation	Simulation Behavior
	Normal	Accelerator	Rapid Accelerator
Interpreted Execution	The block executes using the MATLAB interpreter.	The block executes using the MATLAB interpreter.	Creates a standalone executable from the model.
Code Generation	The block is compiled.	All blocks in the model are compiled.

For more information, see Choosing a Simulation Mode (Simulink).

Programmatic Use

Block Parameter: SimulateUsing

Type: enum

Values: Interpreted Execution, Code Generation

Default: Interpreted Execution

Version History

Introduced in R2014b