Kefei,
There are a few ways to do this. You could record the sweeps in Spike (you may need an SM200 in real-time mode, span >160 MHz, for 1 ms sweeps).
For more control, you could simply record 1 second of I/Q and do your own windowed FFTs. With the SM200B, this would give you up to 2 seconds at 160 MHz span.
A third option is the waterfall spectrum plot in zero span mode. In this mode, the biggest limitation is probably the 1 second requirement. This would set a pretty low I/Q sample rate, since you are limited to a few million I/Q data points.
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