phased.ElementDelay

Sensor array element delay estimator

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Description

The phased.ElementDelay System object™ calculates the signal delay for elements in an array.

To compute the signal delay across the array elements:

  1. Create the phased.ElementDelay object and set its properties.

  2. Call the object with arguments, as if it were a function.

To learn more about how System objects work, see What Are System Objects?

Creation

Syntax

H = phased.ElementDelay
H = phased.ElementDelay(Name=Value)

Description

H = phased.ElementDelay creates an element delay estimator System object to calculate the signal delay for elements in an array when the signal arrives the array from specified directions. By default, a 2-element uniform linear array (ULA) is used.

example

H = phased.ElementDelay(Name=Value) creates an element delay estimator System object with each specified property Name set to the specified Value. Specify optional pairs of arguments as (Name1=Value1,...,NameN=ValueN) where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Properties

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Unless otherwise indicated, properties are nontunable, which means you cannot change their values after calling the object. Objects lock when you call them, and the release function unlocks them.

If a property is tunable, you can change its value at any time.

For more information on changing property values, see System Design in MATLAB Using System Objects.

Sensor array, specified as a Phased Array System Toolbox array System object. The array cannot contain subarrays.

Example: phased.URA

Signal propagation speed, specified as a real-valued positive scalar. Units are in meters per second. The default propagation speed is the value returned by physconst('LightSpeed').

Example: 3e8

Data Types: single | double

Usage

Syntax

tau = H(ang)

Description

tau = H(ang) returns the delay tau of each element relative to the array’s phase center for the signal incident directions specified by and.

Input Arguments

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Signal incident directions in degrees, specified as either of these options.

  • 2-by-M matrix — Each column of the matrix specifies the direction in the form [azimuth; elevation]. The azimuth angle must be between –180 and 180 degrees, inclusive. The elevation angle must be between –90 and 90 degrees, inclusive.

  • Row vector of length M — Each element of the vector specifies a direction’s azimuth angle. In this case, the corresponding elevation angle is assumed to be 0.

Data Types: single | double

Output Arguments

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Element delay, returned as an N-by-M matrix, where N is the number of elements in the array. Each column of the matrix contains the delays of the array elements for the corresponding direction specified in ang.

Data Types: single | double

Object Functions

To use an object function, specify the System object as the first input argument. For example, to release system resources of a System object named obj, use this syntax:

release(obj)

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stepRun System object algorithm
releaseRelease resources and allow changes to System object property values and input characteristics

Examples

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Open Live Script

Calculate the element delay for a uniform linear array when the input is impinging on the array from 30° azimuth and 20° elevation.

array = phased.ULA('NumElements',4);
delay = phased.ElementDelay('SensorArray',array);
tau = delay([30;20])
tau = 4×1
10-8 ×

    0.1175
    0.0392
   -0.0392
   -0.1175

Algorithms

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References

[1] Van Trees, H. Optimum Array Processing. New York: Wiley-Interscience, 2002.

Extended Capabilities

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Version History

Introduced in R2011a

See Also

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