Page 266 - Fundamentals of Radar Signal Processing

LFM pulse is simply βτ; βτ 1 if the LFM pulse is to qualify as a pulse

compression waveform.

FIGURE 4.22 Instantaneous frequency of an LFM pulse.

FIGURE 4.23 Real-valued LFM upchirp waveform, BT product βτ = 50.

Figure 4.24 shows the magnitude spectrum of the LFM waveform for a
relatively low BT product case (βτ = 10), and again for a higher BT product
case (βτ = 100). For low BT the spectrum is relatively poorly defined. As the
BT product increases the spectrum takes on a more rectangular shape. This is
intuitively reasonable: because the sweep is linear, the waveform spreads its

energy uniformly across the spectrum.