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# rainelres

Elevation resolution of rain limited by radar resolution

Since R2021a

## Syntax

``elres = rainelres(r,beamw,grazang)``
``elres = rainelres(r,beamw,grazang,hgt)``

## Description

example

````elres = rainelres(r,beamw,grazang)` returns the elevation resolution of rain limited by the resolution of the radar.```

example

````elres = rainelres(r,beamw,grazang,hgt)` also specifies the height extent of rain.```

## Examples

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Estimate the elevation resolution of rain for a side-looking airborne synthetic aperture radar (SAR) with elevation beamwidth of ${9}^{\circ }$ grazing at ${60}^{\circ }$ for a target range of 10 km. Assume the height extent of rain to be 3 km.

```elbw = 9; grazang = 60; rng = 10e3; hrain = 3000; ```

Compute the rain elevation resolution.

`elres = rainelres(rng,elbw,grazang,hrain)`
```elres = 782.1723 ```

## Input Arguments

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Range from target to antenna in meters, specified as a positive real scalar or a vector.

Data Types: `double`

Elevation beamwidth in degrees, specified as a positive real scalar or a vector.

Data Types: `double`

Grazing angle in degrees, specified as a scalar in the range [`0`, `90`].

Data Types: `double`

Height extent of rain in meters, specified as a real scalar.

Data Types: `double`

## Output Arguments

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Elevation resolution of rain, returned as a matrix. The rows of `elres` correspond to the range values in `r` and its columns correspond to the elevation beamwidth values in `beamw`.

## Version History

Introduced in R2021a