# Documentation

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# range2time

Convert propagation distance to propagation time

## Syntax

``t = range2time(r)``
``t = range2time(r,c)``

## Description

example

````t = range2time(r)` returns the time a signal takes to propagate a given distance. The propagation is assumed to be two-way, as in a monostatic radar system.```
````t = range2time(r,c)` specifies the signal propagation speed.```

## Examples

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Calculate the required PRF in Hertz for a monostatic radar system so that it can have a maximum unambiguous range of 15 km.

```r = 15.0e3; prf = 1/range2time(r)```
```prf = 9.9931e+03 ```

## Input Arguments

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Signal range in meters, specified as an array of nonnegative numbers.

Data Types: `double`

Signal propagation speed, specified as a positive scalar in meters per second.

Data Types: `double`

## Output Arguments

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Propagation time in seconds, returned as an array of nonnegative numbers. The dimensions of `t`are the same as those of `r`.

## Algorithms

The function computes `2*r/c`.

## References

[1] Skolnik, M. Introduction to Radar Systems, 3rd Ed. New York: McGraw-Hill, 2001.