The applet displays the triggering probability, false alarm probability, and the pulse width uncertainty regions around threshold for eight types of microwave receivers.
Different receivers are selected using the drop-down menu.
The blue curve shows the system triggering probability as a function of signal pulse level and pulse duration.
Below the red curve is the region around threshold that the signal pulse width may be incorrectly reported.
Very short pulse widths less than 0.5 x Video Bandwidth will have a degraded detection sensitivity.
Moving the mouse in the probability-signal power space displays the plot data referenced to the x-axis mouse equivalent value.
The TSS line (tangential signal sensitivity) indicates typical sensitivity achieved manually on analogue displays.
Default values may be modified and the display may be updated using the applet or keyboard Enter key. The display automatically scales, dependent on the parameter values selected.
All receiver results assume rectangular shaped RF and video passbands.

User Notes:
The threshold should be chosen to minimise the region of uncertainty, as it is likely that within this region pulses may be truncated and parameter measurements may be incorrectly time-stamped.
The final system design must be rugged enough to accept some parameter uncertainty for signals around threshold if high system sensitivity is a firm requirement.
A significant triggering probability for signals very much less than threshold implies a high false alarm rate on receiver background noise.
The Vector I/Q receiver in the drop-down menu covers the zero-IF and digital Fourier transform channelized receiver types. In this case, one channel only is modeled and the equivalent RF channel bandwidth is double the video processing bandwidth.