Documentation

phased.SumDifferenceMonopulseTracker2D

Sum and difference monopulse for URA

Description

The `SumDifferenceMonopulseTracker2D` object implements a sum and difference monopulse algorithm for a uniform rectangular array.

To estimate the direction of arrival (DOA):

1. Define and set up your sum and difference monopulse DOA estimator. See Construction.

2. Call `step` to estimate the DOA according to the properties of `phased.SumDifferenceMonopulseTracker2D`. The behavior of `step` is specific to each object in the toolbox.

Note

Starting in R2016b, 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.

Construction

`H = phased.SumDifferenceMonopulseTracker2D` creates a tracker System object, `H`. The object uses sum and difference monopulse algorithms on a uniform rectangular array (URA).

`H = phased.SumDifferenceMonopulseTracker2D(Name,Value)` creates a URA monopulse tracker object, `H`, with each specified property Name set to the specified Value. You can specify additional name-value pair arguments in any order as (`Name1`,`Value1`,...,`NameN`,`ValueN`).

Properties

 `SensorArray` Handle to sensor array Specify the sensor array as a handle. The sensor array must be a `phased.URA` object. Default: `phased.URA` with default property values `PropagationSpeed` Signal propagation speed Specify the propagation speed of the signal, in meters per second, as a positive scalar. You can specify this property as single or double precision. Default: Speed of light `OperatingFrequency` System operating frequency Specify the operating frequency of the system in hertz as a positive scalar. The default value corresponds to 300 MHz. You can specify this property as single or double precision. Default: `3e8` `NumPhaseShifterBits` Number of phase shifter quantization bits The number of bits used to quantize the phase shift component of beamformer or steering vector weights. Specify the number of bits as a non-negative integer. A value of zero indicates that no quantization is performed. You can specify this property as single or double precision. Default: `0`

Methods

 step Perform monopulse tracking using URA
Common to All System Objects
`release`

Allow System object property value changes

Examples

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Using a URA, determine the direction of a target at approximately 60° azimuth and 20° elevation.

```array = phased.URA('Size',4); steeringvec = phased.SteeringVector('SensorArray',array); tracker = phased.SumDifferenceMonopulseTracker2D('SensorArray',array); x = steeringvec(tracker.OperatingFrequency,[60.1; 19.5]).'; est_dir = tracker(x,[60; 20])```
```est_dir = 2×1 60.1000 19.5000 ```

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References

[1] Seliktar, Y. Space-Time Adaptive Monopulse Processing. Ph.D. Thesis. Georgia Institute of Technology, Atlanta, 1998.

[2] Rhodes, D. Introduction to Monopulse. Dedham, MA: Artech House, 1980.