Horizontal Wind Model 14
Implement Horizontal Wind Model 14
Libraries:
Aerospace Blockset /
Environment /
Wind
Description
The Horizontal Wind Model 14 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.
Limitation
For code generation, use this block only for targets whose type is int 32 or higher.
Ports
Input
First — geodetic latitude (μ), longitude (l
),
and geopotential altitude (h
)
three-element vector of doubles
The input specifies the geodetic latitude (μ), longitude
(l
), and geopotential altitude (h
)
where the block implements the model.
Latitude and longitude values are in degrees.
The altitude value is in the units you selected in the Units parameter. Specify the altitude element as a value between 0 and 500 km. Values are held outside the range 0 to 500 km.
Second — day of year
scalar double
The input specifies the day of year in Coordinated Universal Time (UTC). The input specifies the day as a value between 1 and 366 (for a leap year). Values are wrapped within 1 to 366 days.
Third — elapsed seconds
scalar double
Contains elapsed seconds since midnight for the selected day, in UTC.
Fourth (Optional) — Ap index
scalar double
Contains the Ap index for the Universal Time (UT) when the block evaluates the model. Select the index from the 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.
Output
First — wind velocity vector
1-by-2 vector of doubles
The wind velocity vector contains the meridional and zonal wind components in that order.
Parameters
Units — input and output units
Metric (MKS)
(default) | English (Velocity in ft/s)
| English (Velocity in kts)
Input and output units for wind speed and velocity, specified as:
Units | Wind Speed | Wind Velocity |
---|---|---|
| Meters per second | Meters per second |
| Feet per second | Feet per second |
| 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
Quiet
(default) | Total
| Disturbance
Select the horizontal wind model type for which to calculate the wind components.
Quiet
Calculate the horizontal wind model without the magnetic disturbances. For this model type, do not input an Ap index value.
Total
Calculate the combined effect of the quiet and magnetic disturbances. For this model type, input Ap index values greater than or equal to zero.
Disturbance
Calculate the effect of magnetic disturbances in the wind. For this model type, input Ap index values greater than or equal to zero.
Programmatic Use
Block Parameter:
model |
Type: character vector |
Values:
'Quiet' | 'Total' |
'Disturbance' |
Default:
'Quiet' |
Action for out-of-range input — block behavior
Error
(default) | Warning
| None
Specify the block behavior when the block inputs are out of range.
Value | Description |
---|---|
| MATLAB® returns an exception, and model simulation
stops. For Accelerator and Rapid Accelerator modes, setting the action
to |
| Warning in the Diagnostic Viewer, and model simulation
continues. For Accelerator and Rapid Accelerator modes, setting the
action to |
| No action. The block imposes upper and lower limits on an input signal. |
Programmatic Use
Block Parameter:
action |
Type: character vector |
Values:
'None' | 'Warning' |
'Error' |
Default:
'Error' |
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
Version History
Introduced in R2016bR2021b: Horizontal Wind Model 14 Block Possible Changed Returned Values
The Horizontal Wind Model 14 block now accepts:
day port values that are decimal, negative,
0
, or greater than366
.sec port values that are
0
or greater than86400
.
As a result, the output values from this block might change from previous releases.
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