Time Varying Gain

Time varying gain (TVG) control

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Libraries:
Phased Array System Toolbox / Detection

Description

The Time Varying Gain block applies a time-varying gain to input signals to compensate for geometric range loss at each range gate. Time varying gain (TVG) is sometimes called automatic gain control (AGC).

Ports

Input

Port_1 — Input signal

vector | matrix

Input signal, specified as a vector or matrix.

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 | single

Port_2 — Range loss

column vector

Range loss, specified as a column vector. The length of p must be equal to or greater than the number of rows of X.

The process equalizes power levels across all samples to match a given reference range. The compensated signal is returned in Y. X can be a column vector, a matrix, or a cube. The gain is applied to each column in X independently. The number of rows in X cannot exceed the length of the loss vector specified in the RangeLoss property. Y has the same dimensionality as X. X can be single or double precision.

Dependencies

To enable this port, set Source of range losses parameter to Input port.

Data Types: double | single

Output

Port_1 — Range-compensated input signal

vector | matrix

Range-compensated Input signal, returned as a vector or matrix. The output has the same size as the input signal.

Data Types: double | single

Parameters

Source of range losses — Source of range losses

Property (default) | Input Port

Range loss source, specified as Property or Input Port.

Property	Range losses are specified by the Range loss (dB) parameter.
Input port	Range losses are specified using the input port L .

Range losses (dB) — Loss at each input sample range

0 (default)

Loss at each input sample range, specified as a vector — elements correspond to the samples in the input signal. Units are in dB.

Reference range loss (dB) — Loss at reference range

0 (default)

Specify the loss at a given reference range as a scalar. Units are in dB.

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