Page 278 - Fundamentals of Radar Signal Processing
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FIGURE 4.30 Scenario for stretch processing analysis.
(4.107)
where ρ is proportional to the scatterer reflectivity. This echo is processed with
the modified coherent receiver in complex equivalent form shown in Fig. 4.31.
The unique aspects of this stretch receiver are the reference oscillator and the
Fourier transform. The oscillator contains a conventional term exp(–jΩt) to
remove the carrier. However, it also contains a replica of the transmitted chirp,
referenced to the time delay t corresponding to the CRP. The reason for the
0
Fourier transform will be apparent shortly.
FIGURE 4.31 Complex equivalent receiver for stretch processor.
After some algebra and using t = t + δt , the output y(t) can be expressed
b
0
b
as
