By Guido Rosignoli
Nice WWII publication
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Extra info for Army Badges and Insignia of World War II (Colour)
Low Probability of Intercept The LPI qualities of the chirped signal have to do with the way receivers are designed. A receiver typically has a bandwidth approximately equal to the frequency occupancy of the signal it is designed to receive. This provides optimum sensitivity (as described in Chapter 4). To maximize transmission efficiency, the signal modulation bandwidth is approximately equal to the Communications Signals 43 bandwidth of the information it is carrying (or varies by some fixed, reversible factor caused by the modulation).
However, many people speak of a signal with a hop rate of about 100 hops per second as a slow hopper and a signal with a significantly higher hop rate as a fast hopper. Most tactical FH systems are slow hoppers. Since they put all of their power onto one frequency at a time, FH signals are easier to detect using sophisticated receivers than are the other types of LPI signals. 34 Frequency hopping signal. 35 Slow versus fast hop. slow hoppers, since they generally dwell at one frequency for multiple milliseconds.
You will note that the noise is fairly constant versus frequency. A characteristic of noise is that it is proportional to the bandwidth of the receiver system in which it is received. , increase 3 dB). If the receiver bandwidth is increased by a factor of 10, the noise increases 10 dB, and so forth. 25 shows the time domain display of a signal with much lower signal-to-noise ratio. Note that the thickness of the line (the noise) is several times greater than the amplitude of the signal. This means that we have a negative signal-to-noise ratio (in dB).