Doppler-Time Intensity Scope

Doppler-time intensity scope

Since R2022a

• 

Libraries:
Phased Array System Toolbox / Sinks

Description

The Doppler-Time Intensity Scope block creates a scrolling display of Doppler response intensities as a function of time. The input consists of Doppler responses for a pulse or FMCW signal. Each frame of data creates a new line on the scope. The scope serves only as a display of the Doppler response. Using the response as input corresponds to setting the IQDataInput property of the phased.DTIScope System object™ to false.

Examples

Simulate and Visualize Range and Doppler Intensity Data in an End-to-End Radar System

Model an end-to-end radar system and use the scopes to visualize range-intensity and Doppler-intensity data in Simulink.

• Open Script

Ports

Input

X — Input data

real-valued length-M vector

Input data, specified as a real-valued length-M vector of Doppler responses. Each vector corresponds to a line of data. The block accepts single precision data type input, but converts the data to double precision for display.

Data Types: double | single

Parameters

Doppler Output — Doppler output domain

'Frequency' (default) | 'Speed'

Doppler output domain, specified as 'Frequency' or 'Speed'. If you set this property to 'Frequency', the Doppler domain is Doppler shift. Units are in Hz. If you set this property to 'Speed'', the Doppler domain is radial speed. Units are in m/s.

Programmatic Use

Block Parameter:DopplerOutput

Type:character vector

Values:'Frequency' | 'Speed'

Default:'Frequency'

Data Types: string

Propagation Speed (m/s) — Signal propagation speed

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

Signal propagation speed, specified as a positive scalar. To obtain the speed of light in SI units, use physconst. Units are in meters/second.

Example: 3e8

Programmatic Use

Block Parameter:PropagationSpeed

Type:double

Values:positive scalar

Default:physconst("LightSpeed")

Data Types: double

Doppler Offset (Hz) — Doppler axis offset

0.0 (default) | scalar

Doppler axis offset, specified as a scalar. This property applies a frequency offset to the Doppler axis. Units are in Hz.

Programmatic Use

Block Parameter:DopplerOffset

Type:double

Values:scalar

Default:0

Data Types: double

Time Span (s) — Time span of display

0.100 (default) | positive scalar

Time span of the intensity display, specified as a positive scalar. Units are in seconds.

Programmatic Use

Block Parameter:TimeSpan

Type:double

Values:scalar

Default:0.1

Data Types: double

Operating Frequency (Hz) — Operating frequency

300e6 (default) | positive scalar

Operating frequency, specified as a positive scalar. Units are in Hz.

Programmatic Use

Block Parameter:OperatingFrequency

Type:double

Values:scalar

Default:300000000

Data Types: double

Doppler Resolution (Hz) — Doppler interval between samples

1.0 (default) | positive scalar

Doppler interval between samples, specified as a positive scalar. This property defines the Doppler frequency difference between the scope columns. Units are in Hz.

Programmatic Use

Block Parameter:DopplerResolution

Type:double

Values:positive scalar

Default:1

Data Types: double

Time Resolution (s) — Time difference between rows

0.001 (default) | positive scalar

Time interval between samples, specified as a positive scalar. This property defines the time duration between rows of scope. Units are in seconds.

Programmatic Use

Block Parameter:TimeResolution

Type:double

Values:positive scalar

Default:0.001

Data Types: double

Show Grid — Show Cartesian grid overlay

on (default) | off

Show Cartesian grid overlay. To show the grid, select the check box.

Programmatic Use

Block Parameter:ShowGrid

Type:logical

Values:1 | 0

Default:1

Show Ticks — Show tick value labels

on (default) | off

Show value labels on tick marks. The display the labels on, select the check box.

Programmatic Use

Block Parameter:ShowTicks

Type:logical

Values:1 | 0

Default:1

Labels

Time Label — Time axis label

'Time (s)' (default) | string

Time-axis label, specified as a string.

Tunable: Yes

Programmatic Use

Block Parameter:TimeLabel

Type:string

Values:string

Default:'Time History (s)'

Data Types: string

Colorbar Label — Color bar label

'dB' (default) | string

Color bar label, specified as a string.

Tunable: Yes

Programmatic Use

Block Parameter:ColorBarLabel

Type:string

Values:string

Default:'dB'

Data Types: string

Title — Window title

'Doppler vs. Time' (default) | string

Window title, specified as a string.

Tunable: Yes

Programmatic Use

Block Parameter:Title

Type:string

Values:string

Default:'Doppler vs. Time'

Data Types: char

Block Characteristics

Data Types	double | single
Direct Feedthrough	no
Multidimensional Signals	no
Variable-Size Signals	no
Zero-Crossing Detection	no

Algorithms

This section shows how to run the scope, configure the settings to show labels for the various features and use the cursor to examine data.

Run the Scope

After selecting and opening the block, the scope displays a single tab PLOT. Opening this tab shows all the controls available for the block. The Settings menu displays all the settable parameters for the scope. The Step Back, Run, Step Forward, and Stop buttons control the simulation. The Data Cursors button lets you examine data values on the display.

Scope Parameter Settings

Selecting the Settings menu from PLOT panel scope opens the parameter window with the DATA AND AXES and LABELS panels.

DATA AND AXES

• Doppler Output – Use this field to choose Frequency for the Doppler shift or Speed for the radial speed.

• Operating Frequency (Hz) - Use this field to set the scaling on the x-axis.

• Doppler Offset (Hz) - Use this field to set the frequency offset of the x-axis.

• Doppler Resolution (Hz) - Use this field to set the granularity of the x-axis.

• Time Span (s) - Use this field to set the duration of the y-axis.

• Time Resolution (s) - Use this field to set the granularity of the y-axis.

Labels

• Time Label – Use this field to set the y-axis label.

• Title – Use this field to set the display title.

• Colorbar Label – Set this field to set the color bar label.

Using Cursors

Select the Cursors Button to display the screen cursors. Each cursor consists of intersecting horizontal and vertical cursors that define a point on the display. Positioning two cursors on the display shows the difference between the intensities at the two cursor points.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

This block can be used for simulation visibility in systems that generate code but is not included in the generated code.

Version History

Introduced in R2022a