Time Sidelobe/Correlation Metrics (Pulse)
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This topic describes the metrics calculated from the time sidelobe/correlation settings in the Correlation tab.
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Peak Rho
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Peak Rho is a measure of the quality of pulse modulation. Rho is computed by comparing the normalized correlated power between a measured pulse and the reference pulse. The maximum value of Rho is 1.0 (which means the measured pulse and reference pulse are 100% identical).
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Peak Sidelobe Level (dB)
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For each pulse in the Correlation Time trace, there is generally a mainlobe peak, and then smaller sidelobes near the mainlobe. The Peak Sidelobe Level is the ratio of the highest sidelobe to the peak of the mainlobe. In some cases, this ratio is determined mostly by the Correlation Reference Window. When searching for a small pulse near, but outside, a large pulse, the peak sidelobe level represents a minimum level for the “small” signal before it can be detected.
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Peak Sidelobe Loc.
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Peak Sidelobe location is the time between the peak sidelobe and the center of the mainlobe peak.
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Compress Ratio (%)
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Compression Ratio is the ratio of the mainlobe width (on Correlation Time) to the original pulse width (on Acquisition Time). Generally, smaller values are “better”, and represent better accuracy for detecting the time position of the pulse.
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Mainlobe Width
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Mainlobe Width is the width of the mainlobe under 3dB from peak on the Correlation Time trace.
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See Also
