sarintang

Coherent integration angle for SAR

Syntax

``ciang = sarintang(lambda,azres)``
``ciang = sarintang(lambda,azres,azb)``

Description

example

````ciang = sarintang(lambda,azres)` returns the coherent integration angle, `ciang`, through which the target is viewed during the coherent processing aperture.```

example

````ciang = sarintang(lambda,azres,azb)` specifies the azimuth impulse broadening factor, `azb`, due to data weighting or windowing for sidelobe control.```

Examples

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Estimate the coherent integration angle of a side-looking airborne synthetic aperture radar (SAR) with an operating frequency of 10 GHz and a cross-range resolution of 1 m. Assume the azimuth broadening factor to be 1.3.

```f = 10e9; azres = 1; azb = 1.3; ```

Compute the coherent integration angle.

```lambda = freq2wavelen(f); ciang = sarintang(lambda,azres,azb)```
```ciang = 1.1165 ```

Input Arguments

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Radar wavelength in meters, specified as a positive real scalar or a vector.

Data Types: `double`

Image azimuth or cross-range resolution in meters, specified as a positive real scalar or a vector.

Data Types: `double`

Azimuth impulse broadening factor, specified as a positive real scalar. `azb` expresses the actual –3 dB mainlobe width with respect to the nominal width. Typical window functions like `hamming` and `hann` exhibit `azb` values in the range from 1 to 1.5.

Data Types: `double`

Output Arguments

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Coherent integration angle in degrees, returned as a matrix. The rows in `ciang` correspond to the wavelengths in `lambda` and the columns correspond to the resolution in `azres`.

Version History

Introduced in R2021a