Horizontal Wind Model 07

R2026b

Implement Horizontal Wind Model 07

• 

Horizontal Wind Model 07 block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Aerospace Blockset / Environment / Wind

Description

The Horizontal Wind Model 07 block implements the U.S. Naval Research Laboratory HWM™ routine to calculate the meridional and zonal components of the wind for a set of geographic coordinates: latitude, longitude, and altitude.

Limitations

For code generation, use this block only for targets whose type is int 32 or higher.

Ports

Input

μ l h — Geodetic latitude, longitude, and geopotential altitude

three-element vector | altitude is a value between 0 and 500 km

Geodetic latitude (μ), longitude (l), and geopotential altitude (h), specified as a three-element vector.

Latitude and longitude values are in degrees.

Altitude values are held outside the range 0 to 500 km. The altitude value is in the units selected in Units.

Data Types: double

day — Day

scalar | value between 1 and 366

Day of year in Coordinated Universal Time (UTC), specified as a value between 1 and 366 (for a leap year). Values are wrapped within the range 1 to 366 days.

Data Types: double

sec — Elapsed seconds

scalar

Elapsed seconds since midnight for the specified day, in UTC.

Data Types: double

Ap — Ap index

scalar | range from 0 to 400

Ap index for the Universal Time (UT), specified as a scalar, ranging from 0 to 400. Select the index from NOAA National Geophysical Data Center, which contains 3 hour interval geomagnetic disturbance index values. If the Ap index value is greater than zero, the software takes into account magnetic effects during model evaluation.

Dependencies

To enable this port, set Model to Total or Disturbance.

Data Types: double

Output

V_wind — Wind velocity vector

1-by-2 vector

Wind velocity vector, returned as a 1-by-2 vector, containing the meridional and zonal wind components, in that order.

Data Types: double

Parameters

Units — Input and output units

Metric (MKS) (default) | English (Velocity in ft/s) | English (Velocity in kts)

Input and output units, specified as:

Units	Wind Speed	Wind Velocity
Metric (MKS)	Meters per second	Meters per second
English (Velocity in ft/s)	Feet per second	Feet per second
English (Velocity in kts)	Knots	Knots

Programmatic Use

Block Parameter: units

Type: character vector

Values: 'Metric (MKS)' | 'English (Velocity in ft/s)' | 'English (Velocity in kts)'

Default: 'Metric (MKS)'

Model — Horizontal wind model type

Quiet (default) | Total | Disturbance

Horizontal wind model type for which to calculate the wind components, specified as:

• Disturbance

  Calculate the effect of only magnetic disturbances in the wind.

• Quiet

  Calculate the horizontal wind model without magnetic disturbances.

• Total

  Calculate the combined effect of the quiet and magnetic disturbances.

Programmatic Use

Block Parameter: model

Type: character vector

Values: 'Quiet' | 'Total' | 'Disturbance'

Default: 'Quiet'

Action for out-of-range input — Out-of-range block behavior

Error (default) | Warning | None

Out-of-range block behavior, specified as follows.

Value	Description
None	No action. The block imposes upper and lower limits on an input signal.
Warning	Warning in the Diagnostic Viewer, model simulation continues. For Accelerator and Rapid Accelerator modes, setting the action to Warning has no effect and the model behaves as though the action is set to None.
Error	MATLAB® returns an exception, model simulation stops. For Accelerator and Rapid Accelerator modes, setting the action to Error has no effect and the model behaves as though the action is set to None.

Programmatic Use

Block Parameter: action

Type: character vector

Values: 'None' | 'Warning' | 'Error'

Default: 'Warning'

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2014b

R2021b: Horizontal Wind Model 07 Block Possible Changed Returned Values

The Horizontal Wind Model 07 block now accepts:

• day port values that are decimal, negative, 0, or greater than 366.

• sec port values that are 0 or greater than 86400.

As a result, the output values from this block might change from previous releases.