Altimeter

Display measurements for aircraft altitude

• 

Libraries:
Aerospace Blockset / Flight Instruments

Description

The Altimeter Indicator block displays the altitude above sea level in feet, also known as the pressure altitude. The block displays the altitude value with needles on a gauge and a numeric indicator.

• The gauge has 10 major ticks. Within each major tick are five minor ticks. This gauge has three needles. Using the needles, the altimeter can display accurately only altitudes between 0 and 100,000 feet.

  • For the longest needle, an increment of a small tick represents 20 feet and a major tick represents 100 feet.

  • For the second longest needle, a minor tick represents 200 feet and a major tick represents 1,000 feet.

  • For the shortest needle a minor tick represents 2,000 feet and a major tick represents 10,000 feet.

• For the numeric display, the block shows values as numeric characters between 0 and 9,999 feet. When the numeric display value reaches 10,000 feet, the gauge displays the value as the remaining values below 10,000 feet. For example, 12,345 feet displays as 2,345 feet. When a value is less than 0 (below sea level), the block displays 0. The needles show the appropriate value except for when the value is below sea level or over 100,000 feet. Below sea level, the needles are set to 0, over 100,000, the needles stay set at 100,000.

Tip

To facilitate understanding and debugging your model, you can modify instrument block connections in your model during normal and accelerator mode simulations.

Examples

HL-20 with Flight Instrumentation Blocks

Simulate approach and landing flight phases of NASA HL-20 lifting body and controller using an auto-landing controller.

• Open Live Script

HL-20 with Flight Instrument Blocks and Visualization Using Unreal Engine

Model NASA HL-20 lifting body and controller modeled in Simulink^® and Aerospace Blockset™, using Unreal Engine^® for visualization.

• Open Live Script

Parameters

Connection — Connect to signal

signal name

Connect to signal for display, selected from list of signal names.

To view the data from a signal, select a signal in the model. The signal appears in the Connection table. Select the option button next to the signal you want to display. Click Apply to connect the signal.

The table has a row for the signal connected to the block. If there are no signals selected in the model, or the block is not connected to any signals, the table is empty.

Label — Block label location

Top (default) | Bottom | Hide

Block label, displayed at the top or bottom of the block, or hidden.

• Top

  Show label at the top of the block.

• Bottom

  Show label at the bottom of the block.

• Hide

  Do not show the label or instructional text when the block is not connected.

Programmatic Use

Block Parameter: LabelPosition

Type: character vector

Values: 'Top' | 'Bottom' | 'Hide'

Default: 'Top'

Extended Capabilities

C/C++ Code Generation

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

This block is ignored for code generation.

Version History

Introduced in R2016a