Techniques
Achieving an accurate emulation of a radar or jammer signal can be quite challenging ... whether the need is to generate realistic radar signals to stimulate a jammer design or playback recorded jammer signals to test a radar system.
thumb comes into play: the sampling rate should be five times the required bandwidth. As a result, the optimum frequency span setting for the signal analyzer is about four times the required bandwidth (5/1.28). As an example, a 30-ns rise time requires a 12-MHz bandwidth (0.35/3x10-7), which suggests a span of 48 MHz. Rounding up to 50 MHz leads to a sampling rate of 64 MSa/s. An analyzer equipped with a 2-GSa capture
buffer could record up to several seconds of data. One more note: To ensure a complete capture, the analyzer should provide negative trigger delay, or pre-
trigger delay. A value of just -1 µs is often enough to account for pulse rise-time and internal trigger jitter in jamming applications.
Measuring And Analyzing The Captured Signal Once the sequence has been captured, there are numerous ways to process the data. For example, one of the main needs in a jamming scenario is measuring the time between the presence of a radar threat pulse and completion of the "identify, set on, and jam" process. It is also useful to measure the time it takes for the
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