Page 318 - Fundamentals of Radar Signal Processing
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Figure 4.58 shows the frequency sequence for a typical low-order Costas
waveform. With proper design of the frequency step sequence, the Costas
waveform can be designed to have a more thumbtack-like ambiguity function
than the linearly stepped waveform. Figure 4.59 illustrates the ambiguity
function of a Costas waveform with N = 15; the frequency step sequence was
c[n] = {1,7,8,11,3,13,9,14,12,6,5,2,10,0,4}. Note the generally low and
relatively uniform sidelobe structure throughout the delay-Doppler plane. The
construction and properties of Costas waveform are discussed and more
examples given in Levanon and Mozeson (2004).
FIGURE 4.58 Frequency sequence for Costas waveform with N = 7.