Velocity, Width, and Intensity Display Features for Testing

The digital signal simulator (DSS) lets you input signals of known properties, then view the results in the Ascope displays.

Effects of clutter filters, time averaging, and PRF can be determined using the spectrum display.

The following moment display features are designed to simplify testing:

  • The velocity against range plot shows the numerical value (in parentheses) of the mean velocity normalized to the interval [-1, +1]. This can be compared directly to the value set in the DSS.
  • The width against range plot also shows the normalized value of the width for direct comparison with the DSS.
  • With no clutter power in the DSS and LOG Range Normalization turned off, the Z or T readouts are 80 dB greater than the DSS setting for signal power (for signal powers >10 dB).
  • With no clutter power in the DSS the MAG(IQ) plot are 3 dB less than the DSS setting for signal power.

When making comparisons, note that the natural fluctuations of weather echoes are also simulated. This means that you can see fluctuations in the values, particularly if the spectrum width and/or the noise power are large.

note After you set the DSS, the same time series is loaded into the signal processor every time. To get a new "realization" select on any of the slide pots that you are using. A fresh time series is created.