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**System object: **phased.DopplerEstimator

**Package: **phased

Estimate target Doppler

`dopest = step(estimator,resp,dopgrid,detidx)`

```
[dopest,dopvar]
= step(estimator,resp,dopgrid,detidx,noisepower)
```

```
[dopest,dopvar]
= step(estimator,resp,dopgrid,detidx,clusterids)
```

```
[dopest,dopvar]
= step(estimator,resp,dopgrid,detidx,noisepower,clusterids)
```

Instead of using the `step`

method to perform
the operation defined by the System
object™, you can call the object
with arguments, as if it were a function. For example, ```
y
= step(obj,x)
```

and `y = obj(x)`

perform
equivalent operations.

estimates Doppler frequencies of detections
derived from the range-Doppler response data,
`dopest`

= step(`estimator`

,`resp`

,`dopgrid`

,`detidx`

)`resp`

. Doppler estimates are
computed for each detection position reported in
`detidx`

. The
`dopgrid`

argument sets the
units for the Doppler dimension of the response
data cube.

You can combine optional input and output arguments when their enabling properties are set.
Optional inputs and outputs must be listed in the same order as the order of the
enabling properties. For example,
`[`

.`dopest`

,`dopvar`

]
= step(`estimator`

,`resp`

,`dopgrid`

,`detidx`

,`noisepower`

,`clusterids`

)

The object performs an initialization the first time the object is executed. This
initialization locks nontunable properties (MATLAB)
and input specifications, such as dimensions, complexity, and data type of the input data.
If you change a nontunable property or an input specification, the System
object issues an error. To change nontunable properties or inputs, you must first
call the `release`

method to unlock the object.