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eclipsingloss

Loss due to pulse eclipsing

    Description

    example

    LECL = eclipsingloss(PD,PFA,N) computes the statistical eclipsing loss, LECL, in decibels for an unmodulated rectangular pulse with a duty cycle of 0.1 given the probability of detection, PD, the probability of false alarm, PFA, and the number of received pulses, N. The function assuming you are using a square-law detector and a nonfluctuating target.

    LECL = eclipsingloss(PD,PFA,N,DU) computes the statistical eclipsing loss for an unmodulated rectangular pulse given the duty cycle, DU, of the transmitted waveform as an additional input argument.

    LECL = eclipsingloss(PD,PFA,N,DU, SW) computes the statistical eclipsing loss for radar echoes received from a chi-squared distributed target given the Swerling case number, SW, as an additional input argument.

    Examples

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    Compute the statistical eclipsing loss for a single unmodulated rectangular pulse. Specify the probability of detection from 0.1–0.99 and probability of false alarm of 1e-6.

    PD = 0.1:0.01:0.99;
    PFA = 1e-6;         
    N = 1; 
    LECL = eclipsingloss(PD,PFA,N);

    Plot the eclipsing loss.

    plot(PD,LECL)
    ylim([0 20]);
    xlabel('Probability of Detection');
    ylabel('Eclipsing loss (dB)');
    title('Statistical Eclipsing Loss vs P_d for Swerling 0 Target');
    grid on;

    Figure contains an axes. The axes with title Statistical Eclipsing Loss vs P_d for Swerling 0 Target contains an object of type line.

    Input Arguments

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    Probability of detection, specified as a positive scalar in the range of [0.1, 0.999999] or as a length-J vector with each element in the range [0.1, 0.999999] .

    Probability of false alarm, specified as a positive scalar or as a length-K vector with each element in the range [1e-15, 1e-3].

    Number of received pulses, specified as a positive scalar.

    Duty cycle, specified as a scalar or length-M vector.

    • If you set DU as a scalar, the function computes the eclipsing loss for an unmodulated rectangular pulse with duty cycle in the range (0, 1).

    • If you set DU as a length-M vector, the function computes the eclipsing loss for an arbitrary waveform specified using the time domain samples taken over a one pulse repetition interval.

    Swerling case number, specified as one of these

    • 'Swerling0'

    • 'Swerling1'

    • 'Swerling2'

    • 'Swerling3'

    • 'Swerling4'

    • 'Swerling5'

    Output Arguments

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    Eclipsing loss, returned as a J-by-K matrix in decibels with rows corresponding to PD and columns corresponding to PFA.

    Extended Capabilities

    C/C++ Code Generation
    Generate C and C++ code using MATLAB® Coder™.

    Introduced in R2021a