# slant2grndrange

Convert slant range to ground range projection

## Syntax

``grndrng = slant2grndrange(slrng,grazang)``

## Description

example

````grndrng = slant2grndrange(slrng,grazang)` returns the ground range projection `grndrng` corresponding to the slant range `slrng` and grazing angle `grazang`.```

## Examples

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Determine the ground range projection given a slant range of 2000 m and a grazing angle of ${30}^{\circ }$.

```slantrng = 2000; grazang = 30;```

Compute the ground range projection.

`grndrng = slant2grndrange(slantrng,grazang)`
```grndrng = 1.7321e+03 ```

Compute the ground range projection for a target having a slant range of 1000 m from a sensor. The sensor is mounted on a platform that is 300 m above ground. Assume the Earth is flat.

```gang = grazingang(300,1000); % Grazing angle depang = gang; % Depression angle grndrng = slant2grndrange(1000,gang)```
```grndrng = 953.9561 ```

Repeat the computation, but now assume the Earth is curved.

```Rearth = physconst('earthradius'); gangsph = grazingang(300,1000,'Curved',Rearth); % Grazing angle depangsph = depressionang(300,1000,'Curved',Rearth); % Depression angle tgtHeight = 0; % Smooth Earth Re = effearthradius(1000,300,tgtHeight); % Effective Earth radius grndrngcurved = Re*deg2rad(depangsph-gangsph)```
```grndrngcurved = 1.2344e+03 ```

## Input Arguments

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Slant range in meters, specified as a positive real scalar or vector.

Data Types: `double`

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

Data Types: `double`

## Output Arguments

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Ground range projection in meters, returned as a positive real scalar or vector. `grndrng` has the same dimensionality as `slrng`.

## Version History

Introduced in R2021a